From nobody Fri May 1 02:57:30 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 0039F3A0D9C; Fri, 1 May 2020 02:57:28 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -9.6 X-Spam-Level: X-Spam-Status: No, score=-9.6 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIMWL_WL_MED=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_BLOCKED=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001, USER_IN_DEF_DKIM_WL=-7.5] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=cisco.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id fwOflWup98Uv; Fri, 1 May 2020 02:57:24 -0700 (PDT) Received: from aer-iport-2.cisco.com (aer-iport-2.cisco.com [173.38.203.52]) (using TLSv1.2 with cipher DHE-RSA-SEED-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 0D2A63A0D99; Fri, 1 May 2020 02:57:23 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=4966; q=dns/txt; s=iport; t=1588327044; x=1589536644; h=subject:to:cc:references:from:message-id:date: mime-version:in-reply-to:content-transfer-encoding; bh=rQajhTCLYp4vMNd5L68a9oThtXY7WcuEq7cUpcwjzQk=; b=bFo95USqzEPtTGjNnUhkHKVxjEBpb2bLhRYhiOX27GZy8j8idV+KbPWH /CTXpB8JavUqqMxSF1uPMNl8rMMgoQY4hKPx3dzASVu1zo1DsAf+ZjWpS MIqSt5A5IcuUyJ65ipyOU7j/RbK0zKpO4FBGFewf8WZUkroF23HMTgszV 8=; X-IronPort-AV: E=Sophos;i="5.73,339,1583193600"; d="scan'208";a="25823126" Received: from aer-iport-nat.cisco.com (HELO aer-core-1.cisco.com) ([173.38.203.22]) by aer-iport-2.cisco.com with ESMTP/TLS/DHE-RSA-SEED-SHA; 01 May 2020 09:57:22 +0000 Received: from [10.60.140.51] (ams-ppsenak-nitro2.cisco.com [10.60.140.51]) by aer-core-1.cisco.com (8.15.2/8.15.2) with ESMTP id 0419vL5F030028; Fri, 1 May 2020 09:57:21 GMT To: Alexander Vainshtein , "shraddha@juniper.net" , "cfilsfil@cisco.com" , "ketant@cisco.com" , "arkadiy.gulko@thomsonreuters.com" Cc: "lsr@ietf.org" , "spring@ietf.org" , "rtgwg@ietf.org" , Michael Gorokhovsky , Ron Sdayoor References: From: Peter Psenak Message-ID: Date: Fri, 1 May 2020 11:57:21 +0200 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:60.0) Gecko/20100101 Thunderbird/60.7.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit X-Outbound-SMTP-Client: 10.60.140.51, ams-ppsenak-nitro2.cisco.com X-Outbound-Node: aer-core-1.cisco.com Archived-At: Subject: Re: [Lsr] SRLG usage in the IGP Flexible Algorithm draft X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 01 May 2020 09:57:29 -0000 Alexander, On 30/04/2020 17:21, Alexander Vainshtein wrote: > Hi all, > > I have a question about the proposed usage of SRLG in the IGP Flexible > Algorithm draft. > > This usage is defined Section 12 of the draft with the reference to the > SRLG exclude rule as following: > > > >       2.  Check if any exclude SRLG rule is part of the Flex-Algorithm > >       definition.  If such exclude rule exists, check if the link is > >       part of any SRLG that is also part of the SRLG exclude rule.  If > >       the link is part of such SRLG, the link MUST be pruned from the > >       computation. > > This looks effectively undistinguishable from the usage of the exclude > Admin groups rule as described in the same Section 12 of the draft: > >       1.  Check if any exclude rule is part of the Flex-Algorithm > >       definition.  If such exclude rule exists, check if any color that > >       is part of the exclude rule is also set on the link.  If such a > >       color is set, the link MUST be pruned from the computation. > > From my POV, with such a definition, there is no need in the dedicated > “Exclude SRLG” rule as part of the specification of the Flexible > Algorithm, since such the SRLG Exclude rule can be replaced with a > matching Exclude All rule  using Admin groups. there is one very important point. Maintaining the affinities is operationally complex. Some networks have already deployed SRLGs. If SRLG exclude with flex-algo gives people what they want, asking them to deploy affinities would be redundant. That's the main point. Simple use case: I have two SRLGs in the network. For some specific traffic I want to send the data via two independent streams. I want to avoid single SRLG failure to affect both streams. I define two flex-algos, each one excluding one SRLG. No need to define extra affinities. This is btw not an academical example, this has been requested by real users. > > I also think that such a usage of SRLG does not fit the needs of the > TI-LFA > > draft that considers an SRLG as a resource that fails when any of the > links/nodes comprising it fails. E.g., it says in Section 2: > >    The Point of Local Repair (PLR), S, needs to find a node Q (a repair > >    node) that is capable of safely forwarding the traffic to a > >    destination D affected by the failure of the protected link L, a set > >    of links including L (SRLG), or the node F itself.  The PLR also > >    needs to find a way to reach Q without being affected by the > >    convergence state of the nodes over the paths it wants to use to > >    reach Q: the PLR needs a loop-free path to reach Q. I see no conflict between the LFA draft and flex-algo one. If you do, please be precise where the conflict is. > > To me this suggests that SRLGs are only relevant when computing backup > paths for specific failures, e.g., an LFA for failure of a link hat > belongs to a specific SRLG must be computed in the topology from which > all the links belonging to the same SRLG are pruned. This understanding > matches RFC 4090 that states in Section 6.2 “Procedures for Backup Path > Computation”: SRLG is a mechanism to express fate share. I see no reason why SRLG could not be used for other than LFA purposes. thanks, Peter > >       - The backup LSP cannot traverse the downstream node and/or link > >         whose failure is being protected against.  Note that if the PLR > >         is the penultimate hop, node protection is not possible, and > >         only the downstream link can be avoided. The backup path may be > >         computed to be SRLG disjoint from the downstream node and/or > >         link being avoided. > > If SRLGs are only relevant for computation of backup paths, it is not > clear to me if they should be part of the definition of a specific > Flexible Algorithm. > > What, if anything, did I miss? > > Regards, and lots of thanks in advance, > > Sasha > > Office: +972-39266302 > > Cell:      +972-549266302 > > Email:   Alexander.Vainshtein@ecitele.com > > > ___________________________________________________________________________ > > This e-mail message is intended for the recipient only and contains > information which is > CONFIDENTIAL and which may be proprietary to ECI Telecom. If you have > received this > transmission in error, please inform us by e-mail, phone or fax, and > then delete the original > and all copies thereof. > ___________________________________________________________________________ From nobody Sun May 3 00:46:33 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 584953A16BD; Sun, 3 May 2020 00:46:32 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.59 X-Spam-Level: X-Spam-Status: No, score=-1.59 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, HTML_MESSAGE=0.001, PDS_BTC_ID=0.5, RCVD_IN_MSPIKE_H2=-0.001, SPF_PASS=-0.001, T_KAM_HTML_FONT_INVALID=0.01, URIBL_BLOCKED=0.001] autolearn=no autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=ecitele.com 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X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fPEJSPgo8L2JvZHk+CjwvaHRtbD4KCg== --_000_AM0PR0302MB32171A34910751F32C94D6E89DA90AM0PR0302MB3217_-- From nobody Sun May 3 16:27:25 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id CF1013A0943 for ; Sun, 3 May 2020 16:27:22 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.897 X-Spam-Level: X-Spam-Status: No, score=-1.897 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, SPF_HELO_NONE=0.001, SPF_NONE=0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Zj-9SIT1eDCW for ; Sun, 3 May 2020 16:27:21 -0700 (PDT) Received: from smtp.chopps.org (smtp.chopps.org [54.88.81.56]) by ietfa.amsl.com (Postfix) with ESMTP id D79EF3A0942 for ; Sun, 3 May 2020 16:27:21 -0700 (PDT) Received: from stubbs.int.chopps.org (047-050-069-038.biz.spectrum.com [47.50.69.38]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by smtp.chopps.org (Postfix) with ESMTPSA id 4D058611D2; Sun, 3 May 2020 23:27:21 +0000 (UTC) Content-Type: text/plain; charset=us-ascii Mime-Version: 1.0 (Mac OS X Mail 13.4 \(3608.80.23.2.2\)) From: Christian Hopps In-Reply-To: <07927ff234a0eb40738e63c36a356df5@xs4all.nl> Date: Sun, 3 May 2020 19:27:20 -0400 Cc: Christian Hopps , lsr@ietf.org Content-Transfer-Encoding: quoted-printable Message-Id: <22AA7F36-9EAD-4EC0-958B-2DC1A4C55DC8@chopps.org> References: <07927ff234a0eb40738e63c36a356df5@xs4all.nl> To: Henk Smit X-Mailer: Apple Mail (2.3608.80.23.2.2) Archived-At: Subject: Re: [Lsr] Why only a congestion-avoidance algorithm on the sender isn't enough X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 03 May 2020 23:27:23 -0000 > On Apr 30, 2020, at 9:57 AM, Henk Smit wrote: >=20 > I still think we'll end up re-implementing a new (and weaker) TCP. Hi Henk, Thanks for the thoughtful writeup. Let's not be too cynical at the start = though! :) I'd note that our environment is a bit more controlled than the = end-to-end internet environment. In IS-IS we are dealing with single = link (logical) so very simple solutions (CTS/RTS, ethernet PAUSE) could = be viable. That aside, yes, there are queues and opportunity for loss = between the receiving linecard interface and the IS-IS process on the = router, but that path is much more accessible (controllable) to the = control loop than all the routers and networks between 2 endpoints for = an internet TCP connection. Also, while it's generally accepted that end-to-end internet based = protocols need to be TCP friendly (e.g., the datagram-based congestion = control algorithms (DCCP)), I'm not sure this requirement needs to be = applied the same way for IS-IS. Thus our choice of algorithms may well = be less restricted. Thanks, Chris. [as WG member] From nobody Sun May 3 19:49:11 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 481553A0AF8 for ; Sun, 3 May 2020 19:49:10 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.1 X-Spam-Level: X-Spam-Status: No, score=-2.1 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=earthlink.net; domainkeys=pass (2048-bit key) header.from=erblichs@earthlink.net header.d=earthlink.net Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 3Fl9tMYqOo64 for ; Sun, 3 May 2020 19:49:08 -0700 (PDT) Received: from elasmtp-curtail.atl.sa.earthlink.net (elasmtp-curtail.atl.sa.earthlink.net [209.86.89.64]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 7F1F73A08B9 for ; Sun, 3 May 2020 19:49:08 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=earthlink.net; s=dk12062016; t=1588560548; bh=xY2at8Q7HVCWIzz8LL3jFR67he6SkgaVodzG xSZF0M0=; h=Received:Content-Type:Mime-Version:Subject:From: In-Reply-To:Date:Cc:Content-Transfer-Encoding:Message-Id: References:To:X-Mailer:X-ELNK-Trace:X-Originating-IP; b=AfDsT3oY47 pNyMXoZ1x8I/esRx+Y+ojtBwhlm4fRvGUl4wPQRs9th7qGlihPE1Hw2QwYaOk9NDCjP X3ae7hGl/SltYKSS7xvsUL1BdjSMH5FKl3YO7dl/XGJjb35W59uzpKLkNQWPvg9J+ht ic/YCFqluiAJOJqbJtt5vX3HaMefFRP64R5l/sOMZBzJDZeqDX9XJpMMC3DTRFJz3CD jF8rwxkHX3SJunAGVNzzjdubXtTySQJ8TQc60GVvK+haBp7oo9yaIeDrvdAYAriypkA Z1UgZiSJfz/xHUJ5bvHPb07YPZvx2jaOFkrns4w8KEKTVJE4mfE156HQ3KX3quLQ== DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=dk12062016; d=earthlink.net; b=HHXoczJAzW6G+oK41kSFbvFOP4O0wENasohG8DJC8GQKNL8hSn6FzTrNj6svMUk70kyWGzI01hOtONgXhKAxzlH3w+JKhHiJ8/7nmmjsbrHFjqlgAbm4+eptpxSoscpe2Pnli1RMt5IM/16WUBxpDb7MZ2SOR2jNQKQXKPEWTLwZAPzLoiKRPmVPoSfvIhs/jkuZAjwPEplG0MWCiIpxGs+Fgh4oyNLxPtAn12nYNmdwh7L5MTTd9ZBP70z95djZO0/OfqvmJwVQZAveKJBrCapARwjnVIm80WKvVsttwqmm6vQLNNXbUJlCUbgKXLSOjNF+YM3HK9LO6wltY3Xc8Q==; h=Received:Content-Type:Mime-Version:Subject:From:In-Reply-To:Date:Cc:Content-Transfer-Encoding:Message-Id:References:To:X-Mailer:X-ELNK-Trace:X-Originating-IP; Received: from [98.234.227.202] (helo=[10.0.0.53]) by elasmtp-curtail.atl.sa.earthlink.net with esmtpsa (TLSv1:ECDHE-RSA-AES256-SHA:256) (Exim 4) (envelope-from ) id 1jVRAI-000DYR-3V; Sun, 03 May 2020 22:49:06 -0400 Content-Type: text/plain; charset=utf-8 Mime-Version: 1.0 (Mac OS X Mail 9.3 \(3124\)) From: Mitchell Erblich In-Reply-To: <07927ff234a0eb40738e63c36a356df5@xs4all.nl> Date: Sun, 3 May 2020 19:49:04 -0700 Cc: lsr@ietf.org Content-Transfer-Encoding: quoted-printable Message-Id: <9EFBCFAD-1CD6-4E58-895E-11C48654C1A2@earthlink.net> References: <07927ff234a0eb40738e63c36a356df5@xs4all.nl> To: Henk Smit X-Mailer: Apple Mail (2.3124) X-ELNK-Trace: 074f60c55517ea841aa676d7e74259b7b3291a7d08dfec79306390f422a66b6e8df786bfa8ceac73350badd9bab72f9c350badd9bab72f9c350badd9bab72f9c X-Originating-IP: 98.234.227.202 Archived-At: Subject: Re: [Lsr] Why only a congestion-avoidance algorithm on the sender isn't enough X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 04 May 2020 02:49:10 -0000 Group, I think we/you are looking at two different = problems: 1) a hop count of 1 or maybe two between the two end points 2) = and the multiple / many hop count between the two end points. RFC3649 does a =E2=80=9Cship-in-the night=E2=80=9D= type implementation of #1, where there is an excess of capacity between = the two end points. It also IMO addresses the ability to burst and then = close a shorter term connection. Thus, I think that your issue is mostly the #2 = problem and the problem that most CA algorithms IMO always try to = increase capacity and thus at some point must exceed capacity. TCP must = find a range of capacity per flow (assuming a consistent a number of = packets per sec). However, what is maybe missed (I missed it in the = document) is the ability not to overshoot the TCP threshold point and = trigger multiple initial congestion events in/exiting the slow-start = phase. FYI: My implementations tend to try to identify a connection of = packets-per-sec with a range using prime numbers, and possibly identify = excess capacity and subdivide that capacity into future multiple = connections. This type of implementation is much easier to do from a = server, that implements the #1 scenario above where the server is one of = the end points. Mitchell Erblich erblichs@earthlink.net > On Apr 30, 2020, at 6:57 AM, Henk Smit wrote: >=20 >=20 > Hello all, >=20 > Two years ago, Gunter Van de Velde and myself published this draft: > https://tools.ietf.org/html/draft-hsmit-lsr-isis-flooding-over-tcp-00 > That started this discussion about flow/congestion control and ISIS = flooding. >=20 > My thoughts were that once we start implementing new algorithms to > optimize ISIS flooding speed, we'll end up with our own version of = TCP. > I think most people here have a good general understanding of TCP. > But if not, this is a good overview how TCP does it: > https://en.wikipedia.org/wiki/TCP_congestion_control >=20 >=20 > What does TCP do: > =3D=3D=3D=3D > TCP does 2 things: flow control and congestion control. >=20 > 1) Flow control is: the receiver trying to prevent itself from being > overloaded. The receiver indicates, through the receiver-window-size > in the TCP acks, how much data it can or wants to receive. > 2) Congestion control is: the sender trying to prevent the links = between > sender and receiver from being overloaded. The sender makes an = educated > guess at what speed it can send. >=20 >=20 > The part we seem to be missing: > =3D=3D=3D=3D > For the sender to make a guess at what speed it can send, it looks at > how the transmission is behaving. Are there drops ? What is the RTT ? > Do drop-percentage and RTT change ? Do acks come in at the same rate > as the sender sends segments ? Are there duplicate acks ? To be able > to do this, the sender must know what to expect. How acks behave. >=20 > If you want an ISIS sender to make a guess at what speed it can send, > without changing the protocol, the only thing the sender can do is = look > at the PSNPs that come back from the receiver. But the RTT of PSNPs = can > not be predicted. Because a good ISIS implementation does not = immediately > send a PSNP when it receives a LSP. 1) the receiver should jitter the = PSNP, > like it should jitter all packets. And 2) the receiver should wait a = little > to see if it can combine multiple acks into a single PSNP packet. >=20 > In TCP, if a single segment gets lost, each new segment will cause the > receiver to send an ack with the seqnr of the last received byte. This > is called "duplicate acks". This triggers the sender to do > fast-retransmission. In ISIS, this can't be be done. The information > a sender can get from looking at incoming PSNPs is a lot less than = what > TCP can learn from incoming acks. >=20 >=20 > The problem with sender-side congestion control: > =3D=3D=3D=3D > In ISIS, all we know is that the default retransmit-interval is 5 = seconds. > And I think most implementations use that as the default. This means = that > the receiver of an LSP has one requirement: send a PSNP within 5 = seconds. > For the rest, implementations are free to send PSNPs however and = whenever > they want. This means a sender can not really make conclusions about > flooding speed, dropped LSPs, capacity of the receiver, etc. > There is no ordering when flooding LSPs, or sending PSNPs. This makes > a sender-side algorithm for ISIS a lot harder. >=20 > When you think about it, you realize that a sender should wait the > full 5 seconds before it can make any real conclusions about dropped = LSPs. > If a sender looks at PSNPs to determine its flooding speed, it will = probably > not be able to react without a delay of a few seconds. A sender might = send > hunderds or thousands of LSPs in those 5 seconds, which might all or > partially be dropped, complicating matters even further. >=20 >=20 > A sender-sider algorithm should specify how to do PSNPs. > =3D=3D=3D=3D > So imho a sender-side only algorithm can't work just like that in a > multi-vendor environment. We must not only specify a = congestion-control > algorithm for the sender. We must also specify for the receiver a more > specific algorithm how and when to send PSNPs. At least how to do = PSNPs > under load. >=20 > Note that this might result in the receiver sending more (and smaller) = PSNPs. > More packets might mean more congestion (inside routers). >=20 >=20 > Will receiver-side flow-control work ? > =3D=3D=3D=3D > I don't know if that's enough. It will certainly help. >=20 > I think to tackle this problem, we need 3 parts: > 1) sender-side congestion-control algorithm > 2) more detailed algorithm on receiver when and how to send PSNPs > 3) receiver-side flow-control mechanism >=20 > As discussed at length, I don't know if the ISIS process on the = receiving > router can actually know if its running out of resources (buffers on > interfaces, linecards, etc). That's implementation dependent. A = receiver > can definitely advertise a fixed value. So the sender has an upper = bound > to use when doing congestion-control. Just like TCP has both a = flow-control > window and a congestion-control window, and a sender uses both. Maybe = the > receiver can even advertise a dynamic value. Maybe now, maybe only in = the > future. An advertised upper limit seems useful to me today. >=20 >=20 > What I didn't like about our own proposal (flooding over TCP): > =3D=3D=3D=3D > The problem I saw with flooding over TCP concerns multi-point networks = (LANs). >=20 > When flooding over a multi-point network, setting up TCP connections > introduces serious challenges. Who are the endpoints of the TCP = connections ? > Full mesh ? Or do all ISes on a LAN create a TCP-connection to the DIS = ? > There is no backup DIS in ISIS (unlike OSPF). Things get messy = quickly. >=20 > However, the other two proposals do not solve this problem either. > How will a sender-side congestion-avoidence algorithm determine = whether > there were drops ? There are no acks (PSNPs) on a LAN. We assume most = LSPs > that are broadcasted are received by all other ISes on the LAN. There = are > no acks. Only after the DIS has sent its periodic CSNPs, ISes can send > PSNPs to request retransmissions. It seems impossible (or very hard) = to > me for all ISes on a LAN to keep track of dropped LSPs and adjust = their > sending speed accordingly. >=20 > When flooding on a LAN, the receiver-side algorithm seems best. = Because > all ISes can see what the lowest advertised sending-speed is. And make > sure they send slow enough to not overload the slowest IS. I'm not = sure > this is a good solution, but is seems easier and more realistic than > ISIS-flooding-over-TCP or sender-side congestion-avoidance. >=20 >=20 > My conclusion: > =3D=3D=3D=3D > Sender-side congestion-control won't work without specifying in more > detail how and when to send PSNPs. > Receiver-side flow-control will certainly help. I dont' know if it's > good enough. I don't know if advertising a static value is good = enough. > But it's a start. >=20 > I still think we'll end up re-implementing a new (and weaker) TCP. >=20 >=20 > henk. >=20 > _______________________________________________ > Lsr mailing list > Lsr@ietf.org > https://www.ietf.org/mailman/listinfo/lsr From nobody Sun May 3 23:12:15 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id B1C463A0CCC for ; Sun, 3 May 2020 23:12:13 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.5 X-Spam-Level: X-Spam-Status: No, score=-1.5 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FORGED_FROMDOMAIN=0.25, FREEMAIL_FROM=0.001, HEADER_FROM_DIFFERENT_DOMAINS=0.249, SPF_HELO_NONE=0.001, SPF_PASS=-0.001] autolearn=no autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 0ecRoHi4dtJB for ; Sun, 3 May 2020 23:12:12 -0700 (PDT) Received: from mail-pf1-x42b.google.com (mail-pf1-x42b.google.com [IPv6:2607:f8b0:4864:20::42b]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 2C73C3A0CC9 for ; Sun, 3 May 2020 23:12:12 -0700 (PDT) Received: by mail-pf1-x42b.google.com with SMTP id x77so5061614pfc.0 for ; Sun, 03 May 2020 23:12:12 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=sender:mime-version:subject:from:in-reply-to:date:cc :content-transfer-encoding:message-id:references:to; bh=Dp4q8UvSXlAyceRCWoAxmPTArm7CJ+ERvp+1Pb7eMu0=; b=m5Nyx/EjhcnUFaB52Oy0zEIxGS0yF/mcTResP8nbcvUtlB+NU/5QPxugv3B/2t8iGa 7gOELyi6HochhbdYlZOtW97mslxIa58KAVCWgshDv4ZlHBJnJEsmNHYHYl3nf8ae+Aw5 KBu1aHxgIU+A8up4UewJOmexQ8Dx9HhlyG4FqCVT4Yr9au2GP/43L3yD76tAruf+14w4 9gM58rCBFOLG/6wuYsGqzfIHRTvNiFK5r4Ud0ZQTqLQ4f/KBlD6wWR/dBYYw+A6PeB+N 40RdVFLkol11d2DVVy9aXJfAppxB/V8pvUR3DAeQ8/oIYjnZfzncacGu2gxwZ1aZN6dC LDdg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:mime-version:subject:from:in-reply-to :date:cc:content-transfer-encoding:message-id:references:to; bh=Dp4q8UvSXlAyceRCWoAxmPTArm7CJ+ERvp+1Pb7eMu0=; b=a0a27+8ZbgwDvOwp8kqZ1VqIa7Ulc+SYV2Bq/MwtaHXJxcGIZQGCtVpFmxdBgYJXWq KKw2Maiw0bxfAgStsIRki9cIkNTTclaNN4CZ8qxBAo7sQ9+tl6wOhXnTH4xq0AOKfXQC sDrzm9l50RmvDZ1QtxDe9UayD49pSEaLayNPTNd0vWrJdVJfqDPTYiMhVP3yHAR5D1t7 TbKuqX0+ZeNC1QYL5PcIFFRV0wYk/7ONb291HKMMNAAVjkwyCZlE5r1mSIIfgMbvDYh/ XVq9Q0A24yYu/if99uGfkfFf1lDhTgb5tKaxkrJ7X/EgQPOJn9oUGwUogg0IP07v4QBC iXiA== X-Gm-Message-State: AGi0PuZ7AjNaN7Wc25ZEa3o7z6OPQR0fM5VmC1WEGETb0eRPlIzh9gdz 0kl4jyO9SkcmVdT6npFFkUk= X-Google-Smtp-Source: APiQypIZzE9p66jgagYN+rwgqyBAZu82EjBN0XgMuWFwAMgFIC6OUpNEsVvsV3j2L4kzk9RqneSBhQ== X-Received: by 2002:a62:9211:: with SMTP id o17mr16061221pfd.234.1588572731625; Sun, 03 May 2020 23:12:11 -0700 (PDT) Received: from [10.95.81.189] ([162.210.129.5]) by smtp.gmail.com with ESMTPSA id y63sm8079609pfg.138.2020.05.03.23.12.09 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Sun, 03 May 2020 23:12:10 -0700 (PDT) Sender: Tony Li Content-Type: text/plain; charset=utf-8 Mime-Version: 1.0 (Mac OS X Mail 13.4 \(3608.80.23.2.2\)) From: tony.li@tony.li In-Reply-To: <9EFBCFAD-1CD6-4E58-895E-11C48654C1A2@earthlink.net> Date: Sun, 3 May 2020 23:12:08 -0700 Cc: Henk Smit , lsr@ietf.org Content-Transfer-Encoding: quoted-printable Message-Id: References: <07927ff234a0eb40738e63c36a356df5@xs4all.nl> <9EFBCFAD-1CD6-4E58-895E-11C48654C1A2@earthlink.net> To: Mitchell Erblich X-Mailer: Apple Mail (2.3608.80.23.2.2) Archived-At: Subject: Re: [Lsr] Why only a congestion-avoidance algorithm on the sender isn't enough X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 04 May 2020 06:12:14 -0000 Mitchell, > I think we/you are looking at two different = problems: 1) a hop count of 1 or maybe two between the two end points 2) = and the multiple / many hop count between the two end points. IS-IS adjacencies are always between immediate L3 neighbors, ignoring = strange things like tunneling. > Thus, I think that your issue is mostly the #2 = problem and the problem that most CA algorithms IMO always try to = increase capacity and thus at some point must exceed capacity. TCP must = find a range of capacity per flow (assuming a consistent a number of = packets per sec). However, what is maybe missed (I missed it in the = document) is the ability not to overshoot the TCP threshold point and = trigger multiple initial congestion events in/exiting the slow-start = phase. Modern router designs have interface bandwidths from 10-400Gb/s. The = CPU would be hard pressed to supply 1Gb/s, therefore for most of the = circumstances that we=E2=80=99re concerned about, the link capacity is = never the issue. Tony From nobody Mon May 4 00:28:52 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 1DEA93A0D1D for ; Mon, 4 May 2020 00:28:50 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.097 X-Spam-Level: X-Spam-Status: No, score=-2.097 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=earthlink.net; domainkeys=pass (2048-bit key) header.from=erblichs@earthlink.net header.d=earthlink.net Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id cnr3aPc6o9b1 for ; Mon, 4 May 2020 00:28:48 -0700 (PDT) Received: from elasmtp-dupuy.atl.sa.earthlink.net (elasmtp-dupuy.atl.sa.earthlink.net [209.86.89.62]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 88F663A0D1B for ; Mon, 4 May 2020 00:28:48 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=earthlink.net; s=dk12062016; t=1588577328; bh=GdaafkXE2ZY0/lnhkYY+A6K6XJaG6HVBI0Vb PlJtZ8I=; h=Received:Content-Type:Mime-Version:Subject:From: In-Reply-To:Date:Cc:Content-Transfer-Encoding:Message-Id: References:To:X-Mailer:X-ELNK-Trace:X-Originating-IP; b=NScwiYSrUb YndRCL99x6GCqqIlCpaEwjA3tYoBxPz99umqFw7zFlUsw5gpdIRyVwIn3gkDLeMfRIQ 8sMsNLM+ImgBUWm63EvDaPFszC9Y79pB9gF0VBUd2eNogagHQgTR+ZEsjbnVlEfcyKg pXZ7ldOkEOtgf7vkjTWPTtn70Iupkjs+6QKonwZiof9AQ7Sla6fqwMCzxf2+MBhJToT usOsC/KO9c/nAKzGKmzy+CtRkTX5y8VgrWJfEMVb6UUS4BXh3I6p+xfqNUzai3eZ8PT omYPWiNiRiZYIrYbyv/PXoq6D6sD5uOiHqNHXvFElwfQUnTc/xiQv8WAIXlgIC8g== DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=dk12062016; d=earthlink.net; b=p1NJiNdr8eqK/3uvFChvtEnS9v5+grPtQYADOUjWB6Lq5X+jyInHIg8LwsYo7AQFd541YGYeFY2fyNA0Ua23Lk59AAztP6lwuiPKZY60+7Rstqi++TR/ojdTDA7gwgBfIVEWnF3bQfxr5TDORuXFVmInWFkdZKO/1x/3Oxj4K8z151KhlVAUyWJgiOsiY1YMwNZB7pjm8B0SVXyURbe33Ikg/JLa2DZovzO6znKOUHuOwY5b/fr3f0KG0XKsdfwAME7NSU/xCgR+tli3KuMKYBjIgsTvLaBucnvepezmtBLeMkv4x8B0CbdZUtozC1P8UXOog22dqVZbtrcxUBDRCw==; h=Received:Content-Type:Mime-Version:Subject:From:In-Reply-To:Date:Cc:Content-Transfer-Encoding:Message-Id:References:To:X-Mailer:X-ELNK-Trace:X-Originating-IP; Received: from [98.234.227.202] (helo=[10.0.0.53]) by elasmtp-dupuy.atl.sa.earthlink.net with esmtpsa (TLSv1:ECDHE-RSA-AES256-SHA:256) (Exim 4) (envelope-from ) id 1jVVWs-000BuO-Dd; Mon, 04 May 2020 03:28:42 -0400 Content-Type: text/plain; charset=utf-8 Mime-Version: 1.0 (Mac OS X Mail 9.3 \(3124\)) From: Mitchell Erblich In-Reply-To: Date: Mon, 4 May 2020 00:28:40 -0700 Cc: Henk Smit , lsr@ietf.org Content-Transfer-Encoding: quoted-printable Message-Id: <77437CE8-E31A-425E-8D6C-930DA5E8861D@earthlink.net> References: <07927ff234a0eb40738e63c36a356df5@xs4all.nl> <9EFBCFAD-1CD6-4E58-895E-11C48654C1A2@earthlink.net> To: tony.li@tony.li X-Mailer: Apple Mail (2.3124) X-ELNK-Trace: 074f60c55517ea841aa676d7e74259b7b3291a7d08dfec79ddaad2ca984b3341495915a2f5da78ac350badd9bab72f9c350badd9bab72f9c350badd9bab72f9c X-Originating-IP: 98.234.227.202 Archived-At: Subject: Re: [Lsr] Why only a congestion-avoidance algorithm on the sender isn't enough X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 04 May 2020 07:28:50 -0000 Inline=E2=80=A6 Mitchell Erblich Implementation of IS-IS for Extreme Networks in what seems Eons ago=E2=80=A6= erblichs@earthlink.net > On May 3, 2020, at 11:12 PM, tony.li@tony.li wrote: >=20 >=20 > Mitchell, >=20 >> I think we/you are looking at two different = problems: 1) a hop count of 1 or maybe two between the two end points 2) = and the multiple / many hop count between the two end points. >=20 >=20 > IS-IS adjacencies are always between immediate L3 neighbors, ignoring = strange things like tunneling. IS-IS has two levels of neighbors via hello level 1s (LSAs) and hello = level 2s :, so immediate is somewhat relative.. >=20 >=20 >> Thus, I think that your issue is mostly the #2 = problem and the problem that most CA algorithms IMO always try to = increase capacity and thus at some point must exceed capacity. TCP must = find a range of capacity per flow (assuming a consistent a number of = packets per sec). However, what is maybe missed (I missed it in the = document) is the ability not to overshoot the TCP threshold point and = trigger multiple initial congestion events in/exiting the slow-start = phase. >=20 >=20 > Modern router designs have interface bandwidths from 10-400Gb/s. The = CPU would be hard pressed to supply 1Gb/s, therefore for most of the = circumstances that we=E2=80=99re concerned about, the link capacity is = never the issue. Sorry, I disagree ,, Link capacity is always an issue.. wrt to = video we now have 4k/8.3mpixels video streams with 8k support at the TV = in the near future. And as you mentioned 400Gb via Link Aggregation=E2=80=A6= Whether a single or multiple 1 core, 4core or more is used and the = speed of the Eth interface(s) is based on the platform. I would assume = that hello 2 level neighbors / adjacencies would be more WAN based and = thus stresses a router=E2=80=99s link capacity more than a standard = neighbors via hello 1s=E2=80=A6=20 Even more grey scale or the number of different colors = of pixels require more link capacity=E2=80=A6 Pixelation on your TV is based on either link capacity = or not being able to process the packets, and thus either get dropped or = just skipped. Even compression consumes CPU processing a requires an = =E2=80=9Centire frame=E2=80=9D / partial frame to be recieved before the = frame can be processed. If we jump to OSPF it is the DRs and BDRs, I would = assume consume more link capacity, than DRothers (note; does not use = TCP).=20 So, link capacity and/or packet-per-sec processing Will = always be an issue in some/many environments, and is more so with IPv4 = due to fragmentation given fixed input queue/fifos sizes, and whether = the router then does tail drops, or REDS (random early discards), or = does delay of dropping an adjacency because it is processing a massive = number of LSAs and has not processed the hello,,, Please tell me 1 = router can process say 1GByte of min sized packets at wire speeds of say = 400Gb/sec, via echo requests/responses=E2=80=A6 aka 1 million pings as a = quick stress test.. Even with long enough FIFOs, don=E2=80=99t we have longer latencies as = we queue up the packets? This is a side effect of link capacity=E2=80=A6=20= Even limiting the number of routers in a area and having slower = or faster convergence, is based on link capacity and CPU capacity,,, aka = the platform >=20 > Tony >=20 From nobody Mon May 4 01:06:06 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 87DF43A00C1; Mon, 4 May 2020 01:06:01 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -8.665 X-Spam-Level: X-Spam-Status: No, score=-8.665 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, BITCOIN_SPAM_02=0.436, DKIMWL_WL_MED=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, PDS_BTC_ID=0.5, SPF_PASS=-0.001, URIBL_BLOCKED=0.001, USER_IN_DEF_DKIM_WL=-7.5] autolearn=no autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=cisco.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id s8xmcuxHJWN9; Mon, 4 May 2020 01:05:59 -0700 (PDT) Received: from aer-iport-1.cisco.com (aer-iport-1.cisco.com [173.38.203.51]) (using TLSv1.2 with cipher DHE-RSA-SEED-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 1670A3A00B2; Mon, 4 May 2020 01:05:58 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=8582; q=dns/txt; s=iport; t=1588579559; x=1589789159; h=subject:to:cc:references:from:message-id:date: mime-version:in-reply-to:content-transfer-encoding; bh=tkDcIcY3v07+KkUo5cLvBEIVaLtLnVciXcC32iS+scM=; b=kWuXHLAxYzhR24l75M9HheGi5ZOyMuRUZ08O5lws6EyNKUUL4hzB5STa ipDKE9D8Nu8U8+a9R+yljtzmvgIP+qyYlVC7QhezEJwjZaN58UGxqjFZU ODwAbNTW2Wiywv8GT+HfY9UAjh1wmN1MNCD2ebwU2QFf+H2s6JR/Jv6RF k=; X-IronPort-AV: E=Sophos;i="5.73,351,1583193600"; d="scan'208";a="25874766" Received: from aer-iport-nat.cisco.com (HELO aer-core-2.cisco.com) ([173.38.203.22]) by aer-iport-1.cisco.com with ESMTP/TLS/DHE-RSA-SEED-SHA; 04 May 2020 08:05:52 +0000 Received: from [10.60.140.51] (ams-ppsenak-nitro2.cisco.com [10.60.140.51]) by aer-core-2.cisco.com (8.15.2/8.15.2) with ESMTP id 04485pSv010390; Mon, 4 May 2020 08:05:51 GMT To: Alexander Vainshtein , "shraddha@juniper.net" , "cfilsfil@cisco.com" , "ketant@cisco.com" , "arkadiy.gulko@thomsonreuters.com" Cc: "lsr@ietf.org" , "spring@ietf.org" , "rtgwg@ietf.org" , Michael Gorokhovsky , Ron Sdayoor References: From: Peter Psenak Message-ID: Date: Mon, 4 May 2020 10:05:51 +0200 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:60.0) Gecko/20100101 Thunderbird/60.7.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit X-Outbound-SMTP-Client: 10.60.140.51, ams-ppsenak-nitro2.cisco.com X-Outbound-Node: aer-core-2.cisco.com Archived-At: Subject: Re: [Lsr] SRLG usage in the IGP Flexible Algorithm draft X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 04 May 2020 08:06:02 -0000 Hi Sasha, On 03/05/2020 09:46, Alexander Vainshtein wrote: > Peter, > > Lots of thanks for a prompt response. > > My reading of your response is as following: > > There are two different ways in which SRLG information can be used with > Flexible Algorithms: > > 1.In a context of a single Flexible Algorithm, it can be used for > computation of backup paths (e.g., as described in the TI-LFA draft). > This usage does not require association of any specific SRLG with the > given Flexible Algorithm. > > 2.In the context of multiple Flexible Algorithms it can be used for > creating disjoint sets of paths by pruning the links belonging to a > specific SRLG from the topology on which a specific Flexible Algorithm > computes its paths. This usage: > > a.Extends the definition of the topology used by a given Flexible > Algorithm that can be defined using Admin groups (a.k.a. affinities) > > b.Facilitates usage of already deployed SRLG configurations where such > configuration have been in place > > c.Requires explicit association of a given Flexible Algorithm with a > specific set of SRLG as defined in the current Flex Algo draft. > > The two usages mentioned above are strictly orthogonal. yes, above is exactly right > > If the understanding above is correct, it makes to me sense to add the > corresponding clarifying text to the draft. sure, I will add it in a next version. thanks, Peter > > Regards, > > Sasha > > Office: +972-39266302 > > Cell:      +972-549266302 > > Email:   Alexander.Vainshtein@ecitele.com > > -----Original Message----- > From: Peter Psenak > Sent: Friday, May 1, 2020 12:57 PM > To: Alexander Vainshtein ; > shraddha@juniper.net; cfilsfil@cisco.com; ketant@cisco.com; > arkadiy.gulko@thomsonreuters.com > Cc: lsr@ietf.org; spring@ietf.org; rtgwg@ietf.org; Michael Gorokhovsky > ; Ron Sdayoor > Subject: Re: SRLG usage in the IGP Flexible Algorithm draft > > Alexander, > > On 30/04/2020 17:21, Alexander Vainshtein wrote: > > > Hi all, > > > > > > I have a question about the proposed usage of SRLG in the IGP Flexible > > > Algorithm > > draft. > > > > > > This usage is defined Section 12 of the draft with the reference to > > > the SRLG exclude rule as following: > > > > > > > > > > > >        2.  Check if any exclude SRLG rule is part of the > > > Flex-Algorithm > > > > > >        definition.  If such exclude rule exists, check if the link is > > > > > >        part of any SRLG that is also part of the SRLG exclude rule. > > > If > > > > > >        the link is part of such SRLG, the link MUST be pruned from the > > > > > >        computation. > > > > > > This looks effectively undistinguishable from the usage of the exclude > > > Admin groups rule as described in the same Section 12 of the draft: > > > > > >        1.  Check if any exclude rule is part of the Flex-Algorithm > > > > > >        definition.  If such exclude rule exists, check if any color > > > that > > > > > >        is part of the exclude rule is also set on the link.  If such a > > > > > >        color is set, the link MUST be pruned from the computation. > > > > > >  From my POV, with such a definition, there is no need in the > > > dedicated “Exclude SRLG” rule as part of the specification of the > > > Flexible Algorithm, since such the SRLG Exclude rule can be replaced > > > with a matching Exclude All rule  using Admin groups. > > there is one very important point. Maintaining the affinities is > operationally complex. Some networks have already deployed SRLGs. If > SRLG exclude with flex-algo gives people what they want, asking them to > deploy affinities would be redundant. That's the main point. > > Simple use case: > > I have two SRLGs in the network. For some specific traffic I want to > send the data via two independent streams. I want to avoid single SRLG > failure to affect both streams. I define two flex-algos, each one > excluding one SRLG. No need to define extra affinities. This is btw not > an academical example, this has been requested by real users. > > > > > > I also think that such a usage of SRLG does not fit the needs of the > > > TI-LFA > > > > > 2F%2Ftools.ietf.org%2Fhtml%2Fdraft-ietf-rtgwg-segment-routing-ti-lfa-0 > > > 3> draft that considers an SRLG as a resource that fails when any of > > > the links/nodes comprising it fails. E.g., it says in Section 2: > > > > > >     The Point of Local Repair (PLR), S, needs to find a node Q (a > > > repair > > > > > >     node) that is capable of safely forwarding the traffic to a > > > > > >     destination D affected by the failure of the protected link L, a > > > set > > > > > >     of links including L (SRLG), or the node F itself.  The PLR also > > > > > >     needs to find a way to reach Q without being affected by the > > > > > >     convergence state of the nodes over the paths it wants to use to > > > > > >     reach Q: the PLR needs a loop-free path to reach Q. > > I see no conflict between the LFA draft and flex-algo one. If you do, > please be precise where the conflict is. > > > > > > To me this suggests that SRLGs are only relevant when computing backup > > > paths for specific failures, e.g., an LFA for failure of a link hat > > > belongs to a specific SRLG must be computed in the topology from which > > > all the links belonging to the same SRLG are pruned. This > > > understanding matches RFC 4090 that states in Section 6.2 “Procedures > > > for Backup Path > > > Computation”: > > SRLG is a mechanism to express fate share. I see no reason why SRLG > could not be used for other than LFA purposes. > > thanks, > > Peter > > > > > >        - The backup LSP cannot traverse the downstream node and/or > > > link > > > > > >          whose failure is being protected against.  Note that if the > > > PLR > > > > > >          is the penultimate hop, node protection is not possible, and > > > > > >          only the downstream link can be avoided. The backup path may > > > be > > > > > >          computed to be SRLG disjoint from the downstream node and/or > > > > > >          link being avoided. > > > > > > If SRLGs are only relevant for computation of backup paths, it is not > > > clear to me if they should be part of the definition of a specific > > > Flexible Algorithm. > > > > > > What, if anything, did I miss? > > > > > > Regards, and lots of thanks in advance, > > > > > > Sasha > > > > > > Office: +972-39266302 > > > > > > Cell:      +972-549266302 > > > > > > Email: Alexander.Vainshtein@ecitele.com > > > > > > > > > > ______________________________________________________________________ > > > _____ > > > > > > This e-mail message is intended for the recipient only and contains > > > information which is CONFIDENTIAL and which may be proprietary to ECI > > > Telecom. If you have received this transmission in error, please > > > inform us by e-mail, phone or fax, and then delete the original and > > > all copies thereof. > > > ______________________________________________________________________ > > > _____ > > > ___________________________________________________________________________ > > This e-mail message is intended for the recipient only and contains > information which is > CONFIDENTIAL and which may be proprietary to ECI Telecom. If you have > received this > transmission in error, please inform us by e-mail, phone or fax, and > then delete the original > and all copies thereof. > ___________________________________________________________________________ From nobody Mon May 4 02:47:42 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 74C1B3A0762 for ; Mon, 4 May 2020 02:47:40 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.099 X-Spam-Level: X-Spam-Status: No, score=-2.099 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=xs4all.nl Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id W2tumftjhMlk for ; Mon, 4 May 2020 02:47:38 -0700 (PDT) Received: from lb3-smtp-cloud7.xs4all.net (lb3-smtp-cloud7.xs4all.net [194.109.24.31]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 2AACB3A074E for ; Mon, 4 May 2020 02:47:37 -0700 (PDT) Received: from webmail.xs4all.nl ([IPv6:2001:888:0:22:194:109:20:213]) by smtp-cloud7.xs4all.net with ESMTPA id VXhGj6ASotKAsVXhGjN3zA; Mon, 04 May 2020 11:47:35 +0200 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=xs4all.nl; s=s1; t=1588585655; bh=FNvTGFQTeCWDUp+B0NZSuyy7BfRUbh6N+6xsnF+E8ng=; h=MIME-Version:Content-Type:Date:From:To:Subject:Message-ID:From: Subject; b=Jj5jX0Zx8nUfVdtTGtnyJOzqtUuQAOxGFGXMFap3byTXru7mA6RjBibQSTjP7DatZ E8FZbDNbat5bXPf+ko2GFdPWhbE/GwVD2opvAKpB3zWZdNz0mQp10eFBn8jE3X40So S1h3rLoJfpWOGmyIR6M/DfMm32W/JSjT7POq+4dM6NR5/E7BzlgBwW7Hd/4j1v495H wQ4k8mEi42iFvg0n9JfuMFICN5FS2jW4pYNOWLxa97BWG6M0CPq0f+xvvD5kXYRSAN HGqPB8tHlKAmmQn0MjU11zxdSoiA/JtwkWdML8zF6cKHQU+IJHg20CXr/eSisKMlCL py/Ip41/sq6Gg== Received: from knint.xs4all.nl ([83.162.203.154]) by webmail.xs4all.nl with HTTP (HTTP/1.1 POST); Mon, 04 May 2020 11:47:34 +0200 MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII; format=flowed Content-Transfer-Encoding: 7bit Date: Mon, 04 May 2020 11:47:34 +0200 From: Henk Smit To: Christian Hopps Cc: lsr@ietf.org In-Reply-To: <22AA7F36-9EAD-4EC0-958B-2DC1A4C55DC8@chopps.org> References: <07927ff234a0eb40738e63c36a356df5@xs4all.nl> <22AA7F36-9EAD-4EC0-958B-2DC1A4C55DC8@chopps.org> Message-ID: <82fdb997da5c9f181deb3a01e90e78f8@xs4all.nl> X-Sender: henk.ietf@xs4all.nl User-Agent: XS4ALL Webmail X-CMAE-Envelope: MS4wfDnjm+6mpN/usQpO2O45is8mLS7P2JBOzh63Srodg39AthJGriIaI7ZewGZYvK4KK9aJSA40NIJhWks2goDB26zCcJ2KQPZEVmv2NLOFfsYPeY63jKeV Uh+Ymkz84YWPQYdaAAJcQx25tuQzSz2gLYONBhHotPhNlJJMkllJ469TidHGouREpqnAdgIfoGfYxDigzMV5dbY6QGlhrTCs3ZAXpu75MusoYGLOZ0pSUQTC Archived-At: Subject: Re: [Lsr] Why only a congestion-avoidance algorithm on the sender isn't enough X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 04 May 2020 09:47:40 -0000 On Friday I wrote: > I still think we'll end up re-implementing a new (and weaker) TCP. Christian Hopps wrote 2020-05-04 01:27: > Let's not be too cynical at the start though! :) I wasn't trying to be cynical. Let me explain my line of reasoning two years ago. When reading about the proposals for limiting the flooding topology in IS-IS, I read a requirement doc. It said that the goal was to support areas (flooding domains) of 10k routers. Or maybe even 100k routers. My immediate thought was: "how are you gonna sync the LSDB when a router boots up ? That takes 300 to 3000 seconds !?". This is the problem I wanted to solve. I hadn't even thought of routers in dense topologies that have 1k+ neighbors. There are currently heathens that use BGP as IGP in their data-centers. There's even a cult that is developing a new IGP on top of BGP (LSVR). If they think BGP/BGP-LS/LSVR are good choices for an IGP, why is that ? One reason is that people claim that BGP is more scalable. Note, when doing "Internet-routing" with large number of prefixes, routers, or some implementations of BGP, still sometimes need minutes, or dozens of minutes to process and re-advetise all those prefixes. So when we talk about minutes, why do people think BGP is so much more wonderful ? I think it's TCP. TCP can transport lots of info quickly and efficiently. And conceptually TCP is easy to understand for the user ("you write into a socket, you read from a socket on the other box. done"). If TCP is good enough for BGP bulk-transport, it should be good enough for IS-IS bulk-transport. If there are issues with using TCP for routing-protocols, I'm sure we've solved those by now (in our implementations). We can use those same solutions/tweaks we use for BGP's TCP in ISIS's TCP. Or am I too naive now ? BTW, all the implementations I've worked with used regular TCP. All the Open Source BGPs seem to be using the regular TCP in their kernels. Can someone explain why TCP is good for BGP but not for IS-IS ? Almost 24 years ago, I sat on a bench in Santa Cruz discussing protocols with an engineer who had a lot more experience than I had, and still have. He was designing LDP at the time (with Yakov). LDP also uses TCP. He said "if we had to design IS-IS now, of course we'd use TCP as transport now". I never forgot that. The goal here is not to make IS-IS transport optimal. We don't need to use maximum available bandwidth. I just happen to think we need the same 2 elements that TCP has: sender-side congestion-avoidance and receiver-side flow-control. I hope I have explained why sender-side congestion-control in IS-IS is not enough (you don't get the feedback you need to make it work). Les and others have tried to explain why receiver-side flow-control is hard to implement (the receiving IS-IS might not know about the state of its interfaces, linecards, etc). That's why I think we need both. And when we implement both, it'll start to look like TCP. So why not use TCP itself ? Or Quic ? Or another transport that's already implemented ? > I'd note that our environment is a bit more controlled than the > end-to-end internet environment. In IS-IS we are dealing with single > link (logical) so very simple solutions (CTS/RTS, ethernet PAUSE) > could be viable. Les's argument is that it's often not so controlled. Let me ask you one question: In your algorithm, the receiving IS-IS will send a "pause signal" when it is overrun. How does IS-IS know it is overrun ? The router is dropping IS-IS pdu's on the interface, on the linecard, on the queue between linecards and Control Plane, on the IS-IS process's input-queue. When queues are full, you can't send a message up saying "we didn't have space for an IS-IS message, but we're sending you this message that we've just dropped an IS-IS message". How do you envision this works ? Imho receiver-side flow-control can only send a rough upper-bound on how many pdu's it can receive normally. A solution with a "pause signal" is basically the same as a receiver-side flow-control, where the receive-window is either 0 or infinite. > Thus our choice of algorithms may well be less restricted. I'm looking forward to seeing (an outline of) your algorithm. Again, I'm not pushing for TCP (anymore). I'm not pushing for anything. I'm just trying to explain the problems that I see with solutions that are, imho, a bit too simple to really help. Maybe I'm wrong, and the problem is simpler than I think. Experimentation would be nice. henk. 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X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX18KClRo aXMgZS1tYWlsIG1lc3NhZ2UgaXMgaW50ZW5kZWQgZm9yIHRoZSByZWNpcGllbnQgb25seSBhbmQg Y29udGFpbnMgaW5mb3JtYXRpb24gd2hpY2ggaXMgCkNPTkZJREVOVElBTCBhbmQgd2hpY2ggbWF5 IGJlIHByb3ByaWV0YXJ5IHRvIEVDSSBUZWxlY29tLiBJZiB5b3UgaGF2ZSByZWNlaXZlZCB0aGlz IAp0cmFuc21pc3Npb24gaW4gZXJyb3IsIHBsZWFzZSBpbmZvcm0gdXMgYnkgZS1tYWlsLCBwaG9u ZSBvciBmYXgsIGFuZCB0aGVuIGRlbGV0ZSB0aGUgb3JpZ2luYWwgCmFuZCBhbGwgY29waWVzIHRo ZXJlb2YuCl9fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fXwo= From nobody Mon May 4 03:05:37 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id C28543A07FB for ; Mon, 4 May 2020 03:05:29 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.099 X-Spam-Level: X-Spam-Status: No, score=-2.099 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=xs4all.nl Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 7RCP1UnxV3Gs for ; Mon, 4 May 2020 03:05:28 -0700 (PDT) Received: from lb3-smtp-cloud7.xs4all.net (lb3-smtp-cloud7.xs4all.net [194.109.24.31]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id DE58A3A0786 for ; Mon, 4 May 2020 03:05:25 -0700 (PDT) Received: from webmail.xs4all.nl ([IPv6:2001:888:0:22:194:109:20:213]) by smtp-cloud7.xs4all.net with ESMTPA id VXyWj6JPOtKAsVXyWjN9sb; Mon, 04 May 2020 12:05:24 +0200 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=xs4all.nl; s=s1; t=1588586724; bh=Ha4yOSL7TuGZY4fjVcguiEbpW/Cw8lhnFtMPzy0WhfY=; h=MIME-Version:Content-Type:Date:From:To:Subject:Message-ID:From: Subject; b=I/osycbO2fvn8CJ4w5YmbJqreZ/TNWfPetWKJX8bL+a4WkrSNQncheQToqFpe77aB 33iuwqwCklIOC1y/QQm32TMGH4G6+ha0f7FwgFl99T4EKbUPaIU8MkI4+Bbi9n5vkZ TczfEs1RSfEeAZzBCway1GavDRHN5MXDcZDaugCjF+TkTpS1KoJp8sln84uXSgMoeU 0O1FeKYp0vqwcu6mNaeGayRF8uL5mZeCPitQWtkXu5CgT5zY8GSWkB7Evn+/qQ5afi hZY6aLUPZdiWEH+2hFRQWT9acBt8AXgiZJpwEsCEJA25Quur00xobP9GOsaVDwFYfE tecqV9pAe+Qig== Received: from knint.xs4all.nl ([83.162.203.154]) by webmail.xs4all.nl with HTTP (HTTP/1.1 POST); Mon, 04 May 2020 12:05:24 +0200 MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII; format=flowed Content-Transfer-Encoding: 7bit Date: Mon, 04 May 2020 12:05:24 +0200 From: Henk Smit To: Mitchell Erblich Cc: tony.li@tony.li, lsr@ietf.org In-Reply-To: <77437CE8-E31A-425E-8D6C-930DA5E8861D@earthlink.net> References: <07927ff234a0eb40738e63c36a356df5@xs4all.nl> <9EFBCFAD-1CD6-4E58-895E-11C48654C1A2@earthlink.net> <77437CE8-E31A-425E-8D6C-930DA5E8861D@earthlink.net> Message-ID: X-Sender: henk.ietf@xs4all.nl User-Agent: XS4ALL Webmail X-CMAE-Envelope: MS4wfKr9tko4qHuSJXRALT7/rBdOPMdeK8GaUPgC/KaIK9DpPYdW3cIUhtrhWHIqV9MXmlMwIRo3te7c3X12PnrVR/xZcuV+dC3nacrc+gjK8E+dYMWk/0K3 Gpt0Q8dz7wI6ngPoZSFT6ykYGQYpjZQ2nrXBf7I5nselMCLa+4y0fv5H2lE8QxcJOMLe6O2+357ha2fWgluzbORWOPC/jlC5I0R759R4pfcwjkeoqlKanw18 qAhkwehzG4WjEc5NAYae4P43NpsYI2t1FZiaHTt/Jy0= Archived-At: Subject: Re: [Lsr] Why only a congestion-avoidance algorithm on the sender isn't enough X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 04 May 2020 10:05:36 -0000 Mitchel wrote: > IS-IS has two levels of neighbors via hello level 1s (LSAs) and hello > level 2s :, so immediate is somewhat relative.. As Tony said, Level-2 neighbors are still directly adjacent. There might be layer-2 switches between them. But there are never layer-3 routers between 2 adjacent level-2 neighbors. Les's point is that interfaces, linecards, and the interface between the data-plane and the control-plane can all be seen as points between 2 ISIS instances/process on two different routers, where ISIS messages might be dropped. And that therefor you need congestion-control (in stead of, or added to) receiver-side flow-control. > Sorry, I disagree, Link capacity is always an issue.. Note, we're not trying to find the maximum number of LSPs we can transmit. We just want to improve the speed a bit. From 33 LSPs/sec today to 10k LSPs/sec or something in that order. There's no need to send 10 million LSPs/sec. Suppose the average LSP is 500 bytes. Suppose a router sends 10k LSPs per second. I think if ISISes can send 10k LSPs/sec, we've solved the problem for 99.99% of networks. 10k LSPs is 5 000 000 bytes. Is 40 000 000 bits. Is 40 Mbps. So a continuous stream of 10k LSPs/sec takes 40 Mbps to transmit. For LSP-flooding, bandwidth itself is never the problem. henk. From nobody Mon May 4 04:26:34 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 7AAFD3A07ED for ; Mon, 4 May 2020 04:26:33 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.897 X-Spam-Level: X-Spam-Status: No, score=-1.897 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, SPF_HELO_NONE=0.001, SPF_NONE=0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 3wXtL_lrNnhc for ; Mon, 4 May 2020 04:26:32 -0700 (PDT) Received: from smtp.chopps.org (smtp.chopps.org [54.88.81.56]) by ietfa.amsl.com (Postfix) with ESMTP id 7F2A63A07EC for ; Mon, 4 May 2020 04:26:32 -0700 (PDT) Received: from stubbs.int.chopps.org (047-050-069-038.biz.spectrum.com [47.50.69.38]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by smtp.chopps.org (Postfix) with ESMTPSA id F21EA610BE; Mon, 4 May 2020 11:26:31 +0000 (UTC) Content-Type: text/plain; charset=us-ascii Mime-Version: 1.0 (Mac OS X Mail 13.4 \(3608.80.23.2.2\)) From: Christian Hopps In-Reply-To: <82fdb997da5c9f181deb3a01e90e78f8@xs4all.nl> Date: Mon, 4 May 2020 07:26:30 -0400 Cc: Christian Hopps , lsr@ietf.org Content-Transfer-Encoding: quoted-printable Message-Id: References: <07927ff234a0eb40738e63c36a356df5@xs4all.nl> <22AA7F36-9EAD-4EC0-958B-2DC1A4C55DC8@chopps.org> <82fdb997da5c9f181deb3a01e90e78f8@xs4all.nl> To: Henk Smit X-Mailer: Apple Mail (2.3608.80.23.2.2) Archived-At: Subject: Re: [Lsr] Why only a congestion-avoidance algorithm on the sender isn't enough X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 04 May 2020 11:26:34 -0000 > On May 4, 2020, at 5:47 AM, Henk Smit wrote: >=20 > I'm looking forward to seeing (an outline of) your algorithm. I'm not trying to push any particular algorithm, we already have some = proposals. My intention was only to suggest that we not disregard = solutions too aggressively. The argument that there are too many queues = in one routers implementation of a punt path, or there are so few or = none that one can't tell IS-IS from other traffic early enough doesn't = mean that one couldn't consider what *would* be required for a simple = solution to be viable. If a simple solution is elegant enough then = perhaps market forces start coming in to play and the cost to implement = isn't actually that high. In any case we already have a couple proposed semi-solutions and during = the meeting it seemed to be agreed that people would write some code and = collect some data at this point. Thanks, Chris. [as WG member]= From nobody Mon May 4 05:51:42 2020 Return-Path: X-Original-To: lsr@ietf.org Delivered-To: lsr@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id 2B9A43A0861; Mon, 4 May 2020 05:51:41 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: Scott Bradner via Datatracker To: Cc: lsr@ietf.org, draft-ietf-isis-mpls-elc.all@ietf.org, last-call@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 6.129.0 Auto-Submitted: auto-generated Precedence: bulk Message-ID: <158859670113.4129.7309190787687316520@ietfa.amsl.com> Reply-To: Scott Bradner Date: Mon, 04 May 2020 05:51:41 -0700 Archived-At: Subject: [Lsr] Opsdir last call review of draft-ietf-isis-mpls-elc-12 X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 04 May 2020 12:51:41 -0000 Reviewer: Scott Bradner Review result: Ready This is an OPS-DIR review of Signaling Entropy Label Capability and Entropy Readable Label Depth Using IS-IS This ID proposes extensions to IS-IS to permit an egress LSR in a MPLS network to signal ingress LSRs in the network that it can process the Entropy Labels used in load balancing of traffic flows. The extensions are simple and are clearly explained in the ID. The ID itself is short and simple and, as such, makes me wonder (rhetorically) why it took 12 versions of the ID to get to this point. I see no operations-related issues with the proposal. 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Mon, 4 May 2020 14:39:12 +0000 From: "Les Ginsberg (ginsberg)" To: Henk Smit , "lsr@ietf.org" Thread-Topic: [Lsr] Why only a congestion-avoidance algorithm on the sender isn't enough Thread-Index: AQHWHvdhEw7ry+sUeU+Vf1i5jKOCzaiX/Hfg Date: Mon, 4 May 2020 14:39:12 +0000 Message-ID: References: <07927ff234a0eb40738e63c36a356df5@xs4all.nl> In-Reply-To: <07927ff234a0eb40738e63c36a356df5@xs4all.nl> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: xs4all.nl; dkim=none (message not signed) header.d=none;xs4all.nl; dmarc=none action=none header.from=cisco.com; x-originating-ip: [2602:306:36ca:6640:6c65:1d24:8d69:db0d] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: 37063762-2e58-4a29-bc21-08d7f038e9f1 x-ms-traffictypediagnostic: MW3PR11MB4714: x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:10000; x-forefront-prvs: 03932714EB x-ms-exchange-senderadcheck: 1 x-microsoft-antispam: BCL:0; x-microsoft-antispam-message-info: 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 x-forefront-antispam-report: CIP:255.255.255.255; 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charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-MS-Exchange-CrossTenant-Network-Message-Id: 37063762-2e58-4a29-bc21-08d7f038e9f1 X-MS-Exchange-CrossTenant-originalarrivaltime: 04 May 2020 14:39:12.8738 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 5ae1af62-9505-4097-a69a-c1553ef7840e X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: i59fqvGNWypGPuIJryDu968prgc6GgqVWZ9QbEzC7sJm5HBnmxntOVoy3TeZ2IcwmNx7+ZbGOF80HhPa4oF09g== X-MS-Exchange-Transport-CrossTenantHeadersStamped: MW3PR11MB4714 X-OriginatorOrg: cisco.com X-Outbound-SMTP-Client: 173.37.102.14, xch-rcd-004.cisco.com X-Outbound-Node: rcdn-core-2.cisco.com Archived-At: Subject: Re: [Lsr] Why only a congestion-avoidance algorithm on the sender isn't enough X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 04 May 2020 14:39:23 -0000 Henk - Thanx for your thoughtful posts. I have read your later posts on this thread as well - but decided to reply = to this one. Top posting for better readability. There is broad agreement that faster flooding is desirable. There are now two proposals as to how to address the issue - neither of whi= ch is proposing to use TCP (or equivalent). I have commented on why IS-IS flooding requirements are significantly diffe= rent than that for which TCP is used. I think it is also useful to note that even the simple test case which Brun= o reported on in last week's interim meeting demonstrated that without any = changes to the protocol at all IS-IS was able to flood an order of magnitud= e faster than it commonly does today. This gives me hope that we are looking at the problem correctly and will no= t need "TCP". Introducing a TCP based solution requires: a)A major change to the adjacency formation logic b)Removal of the independence of the IS-IS protocol from the address famili= es whose reachability advertisements it supports - something which I think = is a great strength of the protocol - particularly in environments where mu= ltiple address family support is needed I really don't want to do either of the above. Your comments regarding PSNP response times are quite correct - and both of= the draft proposals discuss this - though I agree more detail will be requ= ired. It is intuitive that if you want to flood faster you also need to ACK faste= r - and probably even retransmit faster when that is needed. The basic relationship between retransmit interval and PSNP interval is exp= ressed in ISO 10589: " partialSNPInterval - This is the amount of time between periodic action for transmission of Partial Sequence Number PDUs. It shall be less than minimumLSPTransmission-Interval." Of course ISO 10589 recommended values (2 seconds and 5 seconds respectivel= y) associated with a much slower flooding rate and implementations I am awa= re of use values in this order of magnitude. These numbers need to be reduc= ed if we are to flood faster, but the relationship between the two needs to= remain the same. It is also true - as you state - that sending ACKs more quickly will result= in additional PDUs which need to be received/processed by IS-IS - and this= has some impact. But I think it is reasonable to expect that an implementa= tion which can support sending and receiving LSPs at a faster rate should a= lso be able to send/receive PSNPs at a faster rate. But we still need to be= smarter than sending one PSNP/one LSP in cases where we have a burst. LANs are a more difficult problem than P2P - and thus far draft-ginsberg-ls= r-isis-flooding-scale has been silent on this - but not because we aren't a= ware of this - just have focused on the P2P behavior first. What the best behavior on a LAN may be is something I am still considering.= Slowing flooding down to the speed at which the slowest IS on the LAN can = support may not be the best strategy - as it also slows down the propagatio= n rate for systems downstream from the nodes on the LAN which can handle fa= ster flooding - thereby having an impact on flooding speed throughout the n= etwork in a way which may be out of proportion. This is a smaller example o= f the larger issue that when only some nodes in the network support faster = flooding the behavior of the whole network may not be "better" when faster = flooding is enabled because it prolongs the period of LSDB inconsistency. M= ore work needs to be done here... In summary, I don't expect to have to "reinvent TCP" - but I do think you h= ave provided a useful perspective for us to consider as we progress on this= topic, Thanx. Les > -----Original Message----- > From: Lsr On Behalf Of Henk Smit > Sent: Thursday, April 30, 2020 6:58 AM > To: lsr@ietf.org > Subject: [Lsr] Why only a congestion-avoidance algorithm on the sender is= n't > enough >=20 >=20 > Hello all, >=20 > Two years ago, Gunter Van de Velde and myself published this draft: > https://tools.ietf.org/html/draft-hsmit-lsr-isis-flooding-over-tcp-00 > That started this discussion about flow/congestion control and ISIS > flooding. >=20 > My thoughts were that once we start implementing new algorithms to > optimize ISIS flooding speed, we'll end up with our own version of TCP. > I think most people here have a good general understanding of TCP. > But if not, this is a good overview how TCP does it: > https://en.wikipedia.org/wiki/TCP_congestion_control >=20 >=20 > What does TCP do: > =3D=3D=3D=3D > TCP does 2 things: flow control and congestion control. >=20 > 1) Flow control is: the receiver trying to prevent itself from being > overloaded. The receiver indicates, through the receiver-window-size > in the TCP acks, how much data it can or wants to receive. > 2) Congestion control is: the sender trying to prevent the links between > sender and receiver from being overloaded. The sender makes an educated > guess at what speed it can send. >=20 >=20 > The part we seem to be missing: > =3D=3D=3D=3D > For the sender to make a guess at what speed it can send, it looks at > how the transmission is behaving. Are there drops ? What is the RTT ? > Do drop-percentage and RTT change ? Do acks come in at the same rate > as the sender sends segments ? Are there duplicate acks ? To be able > to do this, the sender must know what to expect. How acks behave. >=20 > If you want an ISIS sender to make a guess at what speed it can send, > without changing the protocol, the only thing the sender can do is look > at the PSNPs that come back from the receiver. But the RTT of PSNPs can > not be predicted. Because a good ISIS implementation does not > immediately > send a PSNP when it receives a LSP. 1) the receiver should jitter the > PSNP, > like it should jitter all packets. And 2) the receiver should wait a > little > to see if it can combine multiple acks into a single PSNP packet. >=20 > In TCP, if a single segment gets lost, each new segment will cause the > receiver to send an ack with the seqnr of the last received byte. This > is called "duplicate acks". This triggers the sender to do > fast-retransmission. In ISIS, this can't be be done. The information > a sender can get from looking at incoming PSNPs is a lot less than what > TCP can learn from incoming acks. >=20 >=20 > The problem with sender-side congestion control: > =3D=3D=3D=3D > In ISIS, all we know is that the default retransmit-interval is 5 > seconds. > And I think most implementations use that as the default. This means > that > the receiver of an LSP has one requirement: send a PSNP within 5 > seconds. > For the rest, implementations are free to send PSNPs however and > whenever > they want. This means a sender can not really make conclusions about > flooding speed, dropped LSPs, capacity of the receiver, etc. > There is no ordering when flooding LSPs, or sending PSNPs. This makes > a sender-side algorithm for ISIS a lot harder. >=20 > When you think about it, you realize that a sender should wait the > full 5 seconds before it can make any real conclusions about dropped > LSPs. > If a sender looks at PSNPs to determine its flooding speed, it will > probably > not be able to react without a delay of a few seconds. A sender might > send > hunderds or thousands of LSPs in those 5 seconds, which might all or > partially be dropped, complicating matters even further. >=20 >=20 > A sender-sider algorithm should specify how to do PSNPs. > =3D=3D=3D=3D > So imho a sender-side only algorithm can't work just like that in a > multi-vendor environment. We must not only specify a congestion-control > algorithm for the sender. We must also specify for the receiver a more > specific algorithm how and when to send PSNPs. At least how to do PSNPs > under load. >=20 > Note that this might result in the receiver sending more (and smaller) > PSNPs. > More packets might mean more congestion (inside routers). >=20 >=20 > Will receiver-side flow-control work ? > =3D=3D=3D=3D > I don't know if that's enough. It will certainly help. >=20 > I think to tackle this problem, we need 3 parts: > 1) sender-side congestion-control algorithm > 2) more detailed algorithm on receiver when and how to send PSNPs > 3) receiver-side flow-control mechanism >=20 > As discussed at length, I don't know if the ISIS process on the > receiving > router can actually know if its running out of resources (buffers on > interfaces, linecards, etc). That's implementation dependent. A receiver > can definitely advertise a fixed value. So the sender has an upper bound > to use when doing congestion-control. Just like TCP has both a > flow-control > window and a congestion-control window, and a sender uses both. Maybe > the > receiver can even advertise a dynamic value. Maybe now, maybe only in > the > future. An advertised upper limit seems useful to me today. >=20 >=20 > What I didn't like about our own proposal (flooding over TCP): > =3D=3D=3D=3D > The problem I saw with flooding over TCP concerns multi-point networks > (LANs). >=20 > When flooding over a multi-point network, setting up TCP connections > introduces serious challenges. Who are the endpoints of the TCP > connections ? > Full mesh ? Or do all ISes on a LAN create a TCP-connection to the DIS ? > There is no backup DIS in ISIS (unlike OSPF). Things get messy quickly. >=20 > However, the other two proposals do not solve this problem either. > How will a sender-side congestion-avoidence algorithm determine whether > there were drops ? There are no acks (PSNPs) on a LAN. We assume most > LSPs > that are broadcasted are received by all other ISes on the LAN. There > are > no acks. Only after the DIS has sent its periodic CSNPs, ISes can send > PSNPs to request retransmissions. It seems impossible (or very hard) to > me for all ISes on a LAN to keep track of dropped LSPs and adjust their > sending speed accordingly. >=20 > When flooding on a LAN, the receiver-side algorithm seems best. Because > all ISes can see what the lowest advertised sending-speed is. And make > sure they send slow enough to not overload the slowest IS. I'm not sure > this is a good solution, but is seems easier and more realistic than > ISIS-flooding-over-TCP or sender-side congestion-avoidance. >=20 >=20 > My conclusion: > =3D=3D=3D=3D > Sender-side congestion-control won't work without specifying in more > detail how and when to send PSNPs. > Receiver-side flow-control will certainly help. I dont' know if it's > good enough. I don't know if advertising a static value is good enough. > But it's a start. >=20 > I still think we'll end up re-implementing a new (and weaker) TCP. >=20 >=20 > henk. >=20 > _______________________________________________ > Lsr mailing list > Lsr@ietf.org > https://www.ietf.org/mailman/listinfo/lsr From nobody Tue May 5 02:43:39 2020 Return-Path: X-Original-To: lsr@ietf.org Delivered-To: lsr@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id BD7C43A15F8; Tue, 5 May 2020 02:43:23 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit From: Dhruv Dhody via Datatracker To: Cc: lsr@ietf.org, last-call@ietf.org, draft-ietf-isis-mpls-elc.all@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 6.129.0 Auto-Submitted: auto-generated Precedence: bulk Message-ID: <158867180371.13174.5911030866330688420@ietfa.amsl.com> Reply-To: Dhruv Dhody Date: Tue, 05 May 2020 02:43:23 -0700 Archived-At: Subject: [Lsr] Rtgdir last call review of draft-ietf-isis-mpls-elc-12 X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 05 May 2020 09:43:24 -0000 Reviewer: Dhruv Dhody Review result: Has Issues Hello, I have been selected as the Routing Directorate reviewer for this draft. The Routing Directorate seeks to review all routing or routing-related drafts as they pass through IETF last call and IESG review, and sometimes on special request. The purpose of the review is to provide assistance to the Routing ADs. For more information about the Routing Directorate, please see ​http://trac.tools.ietf.org/area/rtg/trac/wiki/RtgDir Although these comments are primarily for the use of the Routing ADs, it would be helpful if you could consider them along with any other IETF Last Call comments that you receive, and strive to resolve them through discussion or by updating the draft. Document: draft-ietf-isis-mpls-elc-12 Reviewer: Dhruv Dhody Review Date: 2020-05-05 IETF LC End Date: 2020-05-05 Intended Status: Proposed Standard Summary: I have some minor concerns about this document that I think should be resolved before publication. Comments: Disclaimer: I reviewed an earlier version (-08) as part of the early directorate review, which could be located at - https://datatracker.ietf.org/doc/review-ietf-isis-mpls-elc-08-rtgdir-early-dhody-2019-09-12/ I have reviewed this and the OSPF I-D together and you will find similar comments for both I-Ds. You could discuss them in one place. Major Issues: None Minor Issues: (1) Introduction Recently, mechanisms have been defined to signal labels via link- state Interior Gateway Protocols (IGP) such as IS-IS [RFC8667]. Is there a better way to introduce IS-IS extension for SR (than saying that it is just an example to signal labels)? (2) Section 3 Query: The text says that the ABR "MUST" preserve the ELC setting where as the ASBR "SHOULD" preserve it. What is the reason for using SHOULD in case of ASBR? Maybe we can spell out in which case ASBR might not preserve the ELC setting. (3) Section 4 The absence of ERLD-MSD advertisements indicates only that the advertising node does not support advertisement of this capability. Do you mean to differentiate between support for the capability itself v/s support for 'advertisement' only. But RFC 8662 says that ERLD value is advertised only when following conditions are met: * MUST be entropy label capable and, as a consequence, MUST apply the data-plane procedures defined in [RFC6790]. * MUST be able to read an ELI/EL, which is located within its ERLD value. * MUST take into account an EL within the first ERLD labels in its load-balancing function. Thus, I am not sure about this sentence. Maybe you mean to say that the absence only indicates that the ERLD-MSD value of the node is unknown (and it might still be capable of handling ELI/EL)? I see similar language in RFC8491 but I think we could be clearer in this I-D for ERLD. (4) Section 4 What would be the behavior if an IS-IS router receives an ERLD of the node but no ELC set for the corresponding prefix? That would be an error as per RFC 8662, we should specify how one handles it within IS-IS. If it is to just ignore the ERLD, we should explicitly say that. (5) Section 4 We need to clearly state that this new MSD Type is carried in Node MSD sub-TLV as described in [RFC8491]. And then I guess we don't really need figure 2? The format is as per RFC 8491! Nits: (1) Abstract - use term LSP instead of tunnel for consistency OLD: An ingress Label Switching Router (LSR) cannot insert ELs for packets going into a given Label Switched Path (LSP) unless an egress LSR has indicated via signaling that it has the capability to process ELs, referred to as the Entropy Label Capability (ELC), on that tunnel. NEW: An ingress Label Switching Router (LSR) cannot insert ELs for packets going into a given Label Switched Path (LSP) unless an egress LSR has indicated via signaling that it has the capability to process ELs, referred to as the Entropy Label Capability (ELC), on that LSP. END (2) Expand BGP-LS on first use! Thanks! Dhruv From nobody Tue May 5 02:44:55 2020 Return-Path: X-Original-To: lsr@ietf.org Delivered-To: lsr@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id 8A2653A1608; Tue, 5 May 2020 02:44:54 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit From: Dhruv Dhody via Datatracker To: Cc: draft-ietf-ospf-mpls-elc.all@ietf.org, lsr@ietf.org, last-call@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 6.129.0 Auto-Submitted: auto-generated Precedence: bulk Message-ID: <158867189453.14412.14632358918213286203@ietfa.amsl.com> Reply-To: Dhruv Dhody Date: Tue, 05 May 2020 02:44:54 -0700 Archived-At: Subject: [Lsr] Rtgdir last call review of draft-ietf-ospf-mpls-elc-13 X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 05 May 2020 09:44:55 -0000 Reviewer: Dhruv Dhody Review result: Has Issues Hello, I have been selected as the Routing Directorate reviewer for this draft. The Routing Directorate seeks to review all routing or routing-related drafts as they pass through IETF last call and IESG review, and sometimes on special request. The purpose of the review is to provide assistance to the Routing ADs. For more information about the Routing Directorate, please see ​http://trac.tools.ietf.org/area/rtg/trac/wiki/RtgDir Although these comments are primarily for the use of the Routing ADs, it would be helpful if you could consider them along with any other IETF Last Call comments that you receive, and strive to resolve them through discussion or by updating the draft. Document: draft-ietf-ospf-mpls-elc-13 Reviewer: Dhruv Dhody Review Date: 2020-05-05 IETF LC End Date: 2020-05-05 Intended Status: Proposed Standard Summary: I have some minor concerns about this document that I think should be resolved before publication. Comments: Disclaimer: I reviewed an earlier version (-09) as part of the early directorate review, which could be located at - https://datatracker.ietf.org/doc/review-ietf-ospf-mpls-elc-09-rtgdir-early-dhody-2019-09-12/ I have reviewed this and the IS-IS I-D together and you will find similar comments for both I-Ds. You could discuss them in one place. Major Issues: None Minor Issues: (1) Introduction Recently, mechanisms have been defined to signal labels via link- state Interior Gateway Protocols (IGP) such as OSPFv2 [RFC8665] and OSPFv3 [RFC8666]. Is there a better way to introduce OSPF extension for SR (than saying that it is just an example to signal labels)? (2) Section 3 Query: The text says that the ABR "MUST" preserve the ELC setting where as the ASBR "SHOULD" preserve it. What is the reason for using SHOULD in case of ASBR? Maybe we can spell out in which case ASBR might not preserve the ELC setting. (3) Section 4 The absence of ERLD-MSD advertisements indicates only that the advertising node does not support advertisement of this capability. Do you mean to differentiate between support for the capability itself v/s support for 'advertisement' only. But RFC 8662 says that ERLD value is advertised only when following conditions are met: * MUST be entropy label capable and, as a consequence, MUST apply the data-plane procedures defined in [RFC6790]. * MUST be able to read an ELI/EL, which is located within its ERLD value. * MUST take into account an EL within the first ERLD labels in its load-balancing function. Thus, I am not sure about this sentence. Maybe you mean to say that the absence only indicates that the ERLD-MSD value of the node is unknown (and it might still be capable of handling ELI/EL)? (4) Section 4 What would be the behavior if an OSPF router receives a ERLD of the node but no ELC set for the corresponding prefix? That would be an error as per RFC 8662, we should specify how one handles it within OSPF. If it is to just ignore the ERLD, we should explicitly say that. Nits: (1) Change OSPF Working group to LSR Working group in the metadata (first line of the I-D) (2) Abstract - use term LSP instead of tunnel for consistency OLD: An ingress Label Switching Router (LSR) cannot insert ELs for packets going into a given Label Switched Path (LSP) unless an egress LSR has indicated via signaling that it has the capability to process ELs, referred to as the Entropy Label Capability (ELC), on that tunnel. NEW: An ingress Label Switching Router (LSR) cannot insert ELs for packets going into a given Label Switched Path (LSP) unless an egress LSR has indicated via signaling that it has the capability to process ELs, referred to as the Entropy Label Capability (ELC), on that LSP. END (3) Section 4 s/Node MSD sub-TLV/Node MSD TLV/ (4) Expand BGP-LS on first use. Thanks! Dhruv From nobody Tue May 5 03:08:36 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 6CBA53A1605; Tue, 5 May 2020 03:08:33 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -9.601 X-Spam-Level: X-Spam-Status: No, score=-9.601 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIMWL_WL_MED=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, SPF_PASS=-0.001, URIBL_BLOCKED=0.001, USER_IN_DEF_DKIM_WL=-7.5] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=cisco.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Ib_UZecK3Q0g; Tue, 5 May 2020 03:08:30 -0700 (PDT) Received: from aer-iport-1.cisco.com (aer-iport-1.cisco.com [173.38.203.51]) (using TLSv1.2 with cipher DHE-RSA-SEED-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 4D8E93A060D; Tue, 5 May 2020 03:08:29 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=42385; q=dns/txt; s=iport; t=1588673309; x=1589882909; h=subject:to:cc:references:from:message-id:date: mime-version:in-reply-to:content-transfer-encoding; bh=Kq4AqPHINhhQs0KrBMBzhIbruCTuQ6tuJp7CnlIW1IQ=; b=PfdPrO3GtdIjuw/kxhGidFheFvkiQHB26yaQi1uTHroOo47Xiyy6C2hj bIQSGSqwtVqZjm4iiYndgSTpOWkIrCvRvUiX81BafsKT9UAHy0q3TLItT l/K2S949Uq1Ial+xNQCK/H/F/ua+eF5dGqaNu28vUltqGel1fvYnyf05y c=; X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: =?us-ascii?q?A0BQAQC7OrFe/xbLJq1cCh0BAQEBCQE?= =?us-ascii?q?SAQUFAUCBNgUBCwGBd4EgVSAShE2JAYdimiSBZwsBAQEOJQoEAQGERAKCUTc?= =?us-ascii?q?GDgIDAQELAQEFAQEBAgEFBG2FKgYmDIVyBhoBCA8BBTYEBxALDgwCJgICVwY?= =?us-ascii?q?BDAgBAReDCwGCfA8DsgR2gTKEOQGBFoN2gToGgQ4qAYl3gmaBQT+BEAEngmk?= =?us-ascii?q?+gmcBAQOBKA0ED4MsgmAEjhsRGCqTMiuPCX2CUoJwhSiBCoQjTol9Bh2CW4h?= =?us-ascii?q?hBYRPgnGKH5AXiVSTcIFoI4FWMxoIGxU7gjUBNE8YDYoShjkDF4hjhUQ/A2c?= =?us-ascii?q?CBgEHAQEDCZABAiYHghYBAQ?= X-IronPort-AV: E=Sophos;i="5.73,354,1583193600"; d="scan'208";a="25902768" Received: from aer-iport-nat.cisco.com (HELO aer-core-3.cisco.com) ([173.38.203.22]) by aer-iport-1.cisco.com with ESMTP/TLS/DHE-RSA-SEED-SHA; 05 May 2020 10:08:15 +0000 Received: from [10.60.140.51] (ams-ppsenak-nitro2.cisco.com [10.60.140.51]) by aer-core-3.cisco.com (8.15.2/8.15.2) with ESMTP id 045A8E4j001109; Tue, 5 May 2020 10:08:14 GMT To: Alvaro Retana , "draft-ietf-ospf-te-link-attr-reuse@ietf.org" Cc: Yingzhen Qu , "lsr-chairs@ietf.org" , "lsr@ietf.org" References: From: Peter Psenak Message-ID: <6e1f3647-5c1f-4c31-27b7-82fe576d2c96@cisco.com> Date: Tue, 5 May 2020 12:08:14 +0200 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:60.0) Gecko/20100101 Thunderbird/60.7.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit X-Outbound-SMTP-Client: 10.60.140.51, ams-ppsenak-nitro2.cisco.com X-Outbound-Node: aer-core-3.cisco.com Archived-At: Subject: Re: [Lsr] AD Review of draft-ietf-ospf-te-link-attr-reuse-10 X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 05 May 2020 10:08:33 -0000 Hi Alvaro, thanks for your comments. I apologize for the delay in responding to your comments. I tried to address all of them, some have been resolved during ISIS draft review, in which case I took the same resolution for this draf. Please see inline, look for ##PP Dear Authors: Happy New Year! I have finished reading this document, reviewing the e-mail archive and all the various reviews and comments. Quoting one of the authors, "it is essential that the two IGPs provide equivalent functionality" [1] -- so I have considered draft-ietf-isis-te-app-09 in parallel with this one (I'm sending out a separate yet very similar review for it). In general, I think both drafts need some work. When appropriate, I have used "[c]" to highlight comparisons. I tried to put equivalent comments in both documents, but may have missed a few... I have some significant concerns (see details inline) about this document -- and as a result about the ISIS draft. I want to point out a couple of them here: (A) Deployment Considerations This document contains what I would characterize as a "distributed" Deployment Considerations section through §8, §9 and §10. There is a lot of content, but I still made some comments inline about other important information. Please consider consolidating all the deployment-related information in one place. rfc5706 (specially §2) may be useful, please take a look. ##PP I have kept "Attribute Advertisements and Enablement" section (moved it up) and combined "Deployment Considerations" and "Interoperability, Backwards Compatibility and Migration" into single section "Deployment Considerations" similar to what has been done for ISIS [c] This document does not include equivalent information to what is in §7.* in the ISIS draft. Please consider "importing" it (or at least making a reference). ##PP done (B) I was able to identify one significant functional difference which warrants a discussion of the reason for it and maybe the pros/cons: §3 talks about the behavior when "both SABM Length and UDABM Length are 0". This document makes the use of the attributes mandatory by all applications (in conflict with §8.2) while the ISIS draft makes their use optional (§4.1). ##PP removed the text in section 3 and clarified in section "Use of Zero Length Application Identifier Bit Masks" to match what is in ISIS draft. I will wait for this review to be addressed before moving both documents forward together. Thanks! Alvaro. [1] https://mailarchive.ietf.org/arch/msg/ospf/7zkoaLfUe19JxTOWaKWO51wK9gg [Line numbers from idnits.] ... 16 Abstract 18 Various link attributes have been defined in OSPF in the context of 19 the MPLS Traffic Engineering (TE) and GMPLS. Since the original 20 RSVP-TE use case was defined, additional applications (e.g., SRTE, 21 LFA) have been defined which also make use of the link attribute 22 advertisements. This document defines how to distribute link 23 attributes in OSPFv2 and OSPFv3 for applications other than MPLS TE 24 or GMPLS. [c] This abstract is a lot more general, while the ISIS one provides more specifics, including talking about RSVP-TE instead of MPLS TE... [minor] It may not be obvious to all readers what the relationship is between RSVP-TE and MPLS TE... ##PP Made it similar to ISIS draft. ... 89 1. Introduction 91 Various link attributes have been defined in OSPFv2 [RFC2328] and 92 OSPFv3 [RFC5340] in the context of the MPLS TE and GMPLS. All these 93 attributes are distributed by OSPFv2 as sub-TLVs of the Link-TLV 94 advertised in the OSPFv2 TE Opaque LSA [RFC3630]. In OSPFv3, they 95 are distributed as sub-TLVs of the Link-TLV advertised in the OSPFv3 96 Intra-Area-TE-LSA as defined in [RFC5329]. [nit] s/defined in OSPFv2/defined for OSPFv2 [nit] s/context of the MPLS/context of MPLS [minor] "All these attributes..." Which attributes? I'm sure the references are made later, but since they are mentioned here first, please put references here. [[c] The ISIS draft mentions the relevant RFCs from the start.] 98 Many of these link attributes are useful outside of traditional MPLS 99 Traffic Engineering or GMPLS. This brings its own set of problems, 100 in particular how to distribute these link attributes in OSPFv2 and 101 OSPFv3 when MPLS TE and GMPLS are not deployed or are deployed in 102 parallel with other applications that use these link attributes. [nit] "own set of problems" Are there others you want to highlight besides the distribution? [minor] What is an application? I think I can tell the difference between an "application", as used in this document, and an "application" as what the ART area does: "The ART area develops application protocols and architectures in the IETF." [1] Please define what an application is in the context of this document. [1] https://datatracker.ietf.org/group/art/about/ [major] Related to applications... "distinction between link attributes used by TE and link attributes used by other OSPFv2 or OSPFv3 applications" [§2.1] Some of the other applications mentioned (SRTE, for example) are also related to Traffic Engineering, so the general use of TE and non-TE as a distinction is very confusing and seems to assume the type of applications that can use the alternate advertisement are limited to "non-TE" -- but I'm sure that is not the objective. Please be clear in the use of general terms like TE. [c] The ISIS draft seems to be more careful/explicit when pointing out the difference. [nit] s/distribute these link attributes...with other applications that use these link attributes./distribute these link attributes...with other applications that may use them. ##PP Changed to match the ISIS draft, ... 124 1.1. Requirements notation 126 The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", 127 "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this 128 document are to be interpreted as described in [RFC2119]. [major] Use the rfc8174 template. ##PP done [c] Before starting with the solution, the ISIS draft has a section ("Legacy Advertisements") that talks about the current state. I thought that was very helpful. An equivalent section in this case would review (or at least point to) RFC3630, RFC5329, RFC7471, RFC7684, RFC8362... ##PP done. Moved some of the content from section 2.1 to this new section. ... 136 2.1. OSPFv2 Extended Link Opaque LSA and OSPFv3 E-Router-LSA 138 Extended Link Opaque LSAs as defined in [RFC7684] for OSPFv2 and 139 Extended Router-LSAs [RFC8362] for OSPFv3 are used to advertise link 140 attributes that are used by applications other then MPLS TE or GMPLS. 141 These LSAs were defined as a generic containers for distribution of 142 the extended link attributes. There are several advantages in using 143 them: 145 1. Advertisement of the link attributes does not make the link part 146 of the TE topology. It avoids any conflicts and is fully 147 compatible with [RFC3630] and [RFC5329]. 149 2. The OSPFv2 TE Opaque LSA and OSPFv3 Intra-Area-TE-LSA remains 150 truly opaque to OSPFv2 and OSPFv3 as originally defined in 151 [RFC3630] and [RFC5329] respectively. Their contents are not 152 inspected by OSPF, that acts as a pure transport. 154 3. There is clear distinction between link attributes used by TE and 155 link attributes used by other OSPFv2 or OSPFv3 applications. [major] "used by TE" is ambiguous because SRTE, for example, is a form of TE. Note that the TE term is used extensively throughout the document...and it may cause that same type of confusion. The same applies for the mention of "non-TE" later on... Please be explicit and don't simply use TE/non-TE, but as necessary qualify the use. ##PP fixed 157 4. All link attributes that are used by other applications are 158 advertised in a single LSA, the Extended Link Opaque LSA in 159 OSPFv2 or the OSPFv3 E-Router-LSA [RFC8362] in OSPFv3. 161 The disadvantage of this approach is that in rare cases, the same 162 link attribute is advertised in both the TE Opaque and Extended Link 163 Attribute LSAs in OSPFv2 or the Intra-Area-TE-LSA and E-Router-LSA in 164 OSPFv3. Additionally, there will be additional standardization 165 effort. However, this could also be viewed as an advantage as the 166 non-TE use cases for the TE link attributes are documented and 167 validated by the LSR working group. [minor] "...both the TE Opaque and Extended Link Attribute LSAs in OSPFv2 or the Intra-Area-TE-LSA and E-Router-LSA in OSPFv3." It might be good to introduce (maybe in the §2 introduction) how the information is advertised today so that this makes sense to the casual reader. ##PP done [nit] "Additionally, there will be additional standardization effort." Not really a technical argument... Hopefully when attributes are standardized in one case they will at the same time standardized for using the alternate advertisement mechanism. ##PP removed [major] "non-TE use cases" Same comment as above: SRTE is a form of TE. Please either be specific and use MPLS TE/RSVP-TE, or clearly define the terms somewhere so that readers understand that non-TE still includes TE mechanisms like SRTE... ##PP done [nit] The last sentence is unnecessary.. The registration policy for the registries is set at "IETF Review or IESG Approval", which means that any RFC from any WG would be ok to register a new value (IETF Review), and that there may even exist cases when an RFC is not needed (IESG Approval)...and there are also ranges for Experimental Use and FCFS. IOW, there is no guarantee that new attributes, or even the rehashing of existing ones for "non-TE use cases" will even go through the IETF, much less the lsr WG. ##PP removed 169 Extended Link Opaque LSA [RFC7684] and E-Router-LSA [RFC8362] are 170 used to advertise any link attributes used for non-TE applications in 171 OSPFv2 or OSPFv3 respectively, including those that have been 172 originally defined for TE applications. [minor] Please include a forward reference to §4 somewhere. ##PP done [nit] This is the 3rd time that you mention this... ##PP It is important :) 174 TE link attributes used for RSVP-TE/GMPLS continue to use OSPFv2 TE 175 Opaque LSA [RFC3630] and OSPFv3 Intra-Area-TE-LSA [RFC5329]. [nit] Also mentioned above... ##PP We need to make this very clear. I rather keep it in multiple places 177 The format of the link attribute TLVs that have been defined for TE 178 applications will be kept unchanged even when they are used for non- 179 TE applications. Unique code points will be allocated for these TE 180 link attribute TLVs from the OSPFv2 Extended Link TLV Sub-TLV 181 Registry [RFC7684] and from the OSPFv3 Extended LSA Sub-TLV Registry 182 [RFC8362]. For each reused TLV, the code point will be defined in an 183 IETF document along with the expected use-case(s). [minor] s/Unique code points will be allocated.../Unique code points are allocated... Please also add a pointer to the IANA Considerations section here. ##PP done [major] "For each reused TLV, the code point will be defined in an IETF document along with the expected use-case(s)." It sounds as if the intent of this sentence is to set a requirement for future work. However, as I mentioned above, the Registration Policy defined for the registries don't support asking for any type of IETF documentation. ##PP removed 185 3. Advertisement of Application Specific Values 187 To allow advertisement of the application specific values of the link 188 attribute, a new Application Specific Link Attributes (ASLA) sub-TLV 189 is defined. The ASLA sub-TLV is a sub-TLV of the OSPFv2 Extended 190 Link TLV [RFC7471] and OSPFv3 Router-Link TLV [RFC8362]. [minor] s/RFC7471/RFC7684 ##PP fixed ... 221 SABM Length: Standard Application Identifier Bit-Mask Length. It 222 MUST be a multiple of 4 bytes. If the Standard Application Bit- 223 Mask is not present, the Standard Application Bit-Mask Length MUST 224 be set to 0. [c] The ISIS draft defines the L-flag to indicate that the "applications listed...MUST use the legacy advertisements". There is no equivalent functionality here. Please see my comments about this in §4.1 (of the ISIS draft). ##PP That is correct, there is no L-flag in OSPF. We do not plan to use TE Opaque LSA for anything else than what they have been defined for. ... 231 Standard Application Identifier Bit-Mask: Optional set of bits, 232 where each bit represents a single standard application. Bits are 233 defined in [I-D.ietf-isis-te-app], which also request a new IANA 234 "Link Attribute Applications" registry under "Interior Gateway 235 Protocol (IGP) Parameters" for them. The bits are repeated here 236 for informational purpose: [minor] s/Bits are defined in [I-D.ietf-isis-te-app], which also request a new IANA "Link Attribute Applications" registry under "Interior Gateway Protocol (IGP) Parameters" for them./Bits are defined in [I-D.ietf-isis-te-app]. ##PP done 238 Bit-0 (R-bit): RSVP TE [nit] s/RSVP TE/RSVP-TE ##PP done 240 Bit-1 (S-bit): Segment Routing TE 242 Bit-2 (F-bit): Loop Free Alternate (LFA). Includes all LFA 243 types [just wondering] Given that we're trying to future-proof... Can there be cases where the link attributes for "normal" LFA, vs Remote LFA (for example) might need to be different? Considering that part of the justification for this work is the need to potentially advertise different attributes per application, and given that the question "what is meant by LFA?" came up more than once on the mailing list, I guess the answer might be yes (at least for some use cases). Knowing that the user has their own bits to play with, I'm sure they can accommodate if the need comes up. Just thinking out loud... ##PP has been closed with ISIS draft. ... 248 Standard Application Identifier Bits are defined/sent starting with 249 Bit 0. Additional bit definitions that are defined in the future 250 SHOULD be assigned in ascending bit order so as to minimize the 251 number of octets that will need to be transmitted. [major] "Additional bit definitions that may be defined in the future SHOULD be assigned in ascending bit order so as to minimize the number of octets that will need to be transmitted." This statement about assignment belongs in the IANA Consideration section as part of the instructions to IANA on how to manage the space. [major] When would it be ok for IANA not to assign the values in order? IOW, why is that a SHOULD and not a MUST? [minor] Given the intent to minimize the transmissions, should there be a statement standardizing that behavior? I'm thinking of something like: "In order to minimize the number of octets transmitted, the sender SHOULD/MUST (?) transmit only the minimum necessary amount of information..." IOW, the assignment policy, and the ability to advertise the *ABM Length is useless unless the sender takes advantage of it. #PP removed this text, as bits and the registry that defines them is specified in ISIS draft. 253 User Defined Application Identifier Bits have no relationship to 254 Standard Application bits and are NOT managed by IANA or any other 255 standards body. It is recommended that bits are used starting with 256 Bit 0 so as to minimize the number of octets required to advertise 257 all of them. [nit] "all of them", what? s/all of them/any User Defined Applications. ##PP Changed to "all UDAs" 259 Undefined bits in both Bit-Masks MUST be transmitted as 0 and MUST be 260 ignored on receipt. Bits that are NOT transmitted MUST be treated as 261 if they are set to 0 on receipt. [major] "Undefined bits MUST be transmitted as 0 and MUST be ignored on receipt." What if the sender and the receiver support a different set of applications? For example, suppose that the sender supports a new application identified by the N-bit, and sets only that bit; the receiver treats the N-bit as unknown (= undefined) and ignores it. The result is that, for the receiver, there seems to be no indication of an application. Is "no application" a valid indication, or should at least one bit always be set? ##PP Just like unknown TLVs, unknown bits MUST be ignored. I have added more text, similar to ISIS. Note that below the case is presented for when "neither the Standard Application Bits nor the User Defined Application bits are set (i.e., both SABM Length and UDABM Length are 0)", but the condition is different because the bits are not present (see my comment below). [minor] Following on the previous comment... It seems that a requirement is for the routers/nodes in the domain to agree on the meaning of the bits: support the same Standard Applications and interpret the User Defined bit mask the same way. Please add this type of information to the potential new Deployment Considerations Section. ##PP For Standard Applications it is obvious that we need to agree on the meaning of the bits. That's why we are standardizing them. For User Defined bits, I would rather avoid specifying anything, it's up to the user what it does. [nit] "Bits that are NOT transmitted MUST be..." While I understand what you mean, having Normative language for the behavior of things that are not received doesn't seem appropriate. How about something like this: "Any omitted bits MUST be..."? ##PP aligned with ISIS draft. ... 271 The advantage of not making the Application Bit-Masks part of the 272 attribute advertisement itself is that we can keep the format of the 273 link attributes that have been defined previously and reuse the same 274 format when advertising them in the ASLA sub-TLV. [nit] s/we can keep the format of the link attributes that have been defined previously and reuse the same format when advertising them in the ASLA sub-TLV./the format of any previously defined link attributes can be kept and reused when advertising them in the ASLA sub-TLV. ##PP done 276 When neither the Standard Application Bits nor the User Defined 277 Application bits are set (i.e., both SABM Length and UDABM Length are 278 0) in the ASLA sub-TLV, then the link attributes included in it MUST 279 be considered as being applicable to all applications. [major] s/bits are set/bits are present "set" gives the impression of them being "1"; it's different to have them all be 0 than to have then not be there. [major] The specification of what to do when "both SABM Length and UDABM Length are 0" is inconsistent with §8.2. Please specify the behavior only once. ##PP I have removed this text and added the text to "Deployment consideration " section. The text matches what is in the ISIS draft. [c] The ISIS draft leaves open the possibility for applications to use the attributes while this document makes it mandatory. I think this is a significant functional difference. ##PP I have aligned with ISIS. 281 If, however, another advertisement of the same link attribute 282 includes any Application Bit-Mask in the ASLA sub-TLV, applications 283 that are listed in the Application Bit-Masks of such ASLA sub-TLV 284 SHOULD use the attribute advertisement which has the application 285 specific bit set in the Application Bit-Masks. 287 If the same application is listed in the Application Bit-Masks of 288 more then one ASLA sub-TLV, the application SHOULD use the first 289 advertisement and ignore any subsequent advertisements of the same 290 attribute. This situation SHOULD be logged as an error. [major] For the first two SHOULDs (in the last two paragraphs: "SHOULD use the attribute advertisement" and "SHOULD use the first advertisement"). When is it ok to not do as specified? For example, are there specific considerations related to not selecting the first advertisement? Why would a receiver not use the attribute advertisement which has the application specific bit set? IOW, why are these not MUSTs? ##PP Changed to MUST. 292 This document defines the initial set of link attributes that MUST 293 use ASLA sub-TLV if advertised in the OSPFv2 Extended Link TLV or in 294 the OSPFv3 Router-Link TLV. If the ASLA sub-TLV includes any link 295 attribute(s) NOT listed below, they MUST be ignored. Documents which 296 define new link attributes MUST state whether the new attributes 297 support application specific values and as such MUST be advertised in 298 an ASLA sub-TLV. The link attributes that MUST be advertised in ASLA 299 sub-TLVs are: [nit] s/use ASLA sub-TLV/use the ASLA sub-TLV ##PP fixed [major] "initial set of link attributes that MUST use [the] ASLA sub-TLV if advertised..." The second paragraph in this section says that "ASLA sub-TLV is an optional sub-TLV" -- that is a true statement. However, the ASLA sub-TLV is (according to this paragraph) mandatory when the link attributes are used. Suggestion (for the second paragraph)> The ASLA sub-TLV is an optional sub-TLV and can appear multiple times in the OSPFv2 Extended Link TLV and OSPFv3 Router-Link TLV. It MUST be present if any of the link attributes listed at the end on this section are advertised. It has the following format: ##PP done 301 - Shared Risk Link Group 303 - Unidirectional Link Delay 305 - Min/Max Unidirectional Link Delay 307 - Unidirectional Delay Variation 309 - Unidirectional Link Loss 311 - Unidirectional Residual Bandwidth 313 - Unidirectional Available Bandwidth 315 - Unidirectional Utilized Bandwidth 317 - Administrative Group 319 - Extended Administrative Group 321 - TE Metric [minor] Please include references for the definition of these attributes. ##PP done 323 4. Reused TE link attributes 325 This section defines the use case and code points from the OSPFv2 326 Extended Link TLV Sub-TLV Registry and OSPFv3 Extended LSA Sub-TLV 327 Registry for some of the link attributes that have been originally 328 defined for TE or GMPLS. [minor] "defines the...code points" The code points are assigned/defined by IANA later on.. Perhaps: "This section defines the use cases and indicates the code points (see Section 12)..." ##PP done ... 408 4.4. TE Metric 410 [RFC3630] defines TE Metric. [minor] rfc3630 calls it "Traffic Engineering Metric" ##PP fixed ... 417 5. Maximum Link Bandwidth [nit] Include the application independent attributes in a single section -- a sub-section each. 419 Maximum link bandwidth is an application independent attribute of the 420 link that is defined in [RFC3630]. Because it is an application 421 independent attribute, it MUST NOT be advertised in ASLA sub-TLV. 422 Instead, it MAY be advertised as a sub-TLV of the Extended Link 423 Opaque LSA Extended Link TLV in OSPFv2 [RFC7684] or sub-TLV of OSPFv3 424 E-Router-LSA Router-Link TLV in OSPFv3 [RFC8362]. [minor] I understand why the "Maximum link bandwidth is an application independent attribute of the link". But I am having a harder time understanding why other bandwidth-related metrics (specifically Unidirectional Residual Bandwidth, Unidirectional Available Bandwidth and Unidirectional Utilized Bandwidth) are not treated the same way. A similar question was raised on the list and the treatment was justified in order to support use cases where the bandwidth is managed per application [1]. I don't want to revisit the discussion here about the treatment, but it is important for the reader to understand the existence of those use cases. Please add a paragraph or two talking about the consideration. ##PP added a similar section as the one that has been added to ISIS draft. [1] https://mailarchive.ietf.org/arch/msg/ospf/xl8HWDeQqYNcv_X_568-xv6rfvk [minor] This attribute and other bandwidth-related ones are prone to interaction as multiple applications may want to use the resources. While the use of the resources is out of scope, it would be helpful to include that type of information in a Deployment Considerations section. [c] A related point was made when reviewing the ISIS draft [1]. [1] https://mailarchive.ietf.org/arch/msg/isis-wg/2M2pho1EZcVTkOOQssLQUVO0HY4 ##PP I hope the added section makes it clear. ... [minor][c] The ISIS draft also calls out the Maximum Reservable Link Bandwidth and Unreserved Bandwidth as attributes specific to RSVP-TE...but this document doesn't [§4.2.2]. Why? I think the answer has to do with this text from §2.1: TE link attributes used for RSVP-TE/GMPLS continue to use OSPFv2 TE Opaque LSA [RFC3630] and OSPFv3 Intra-Area-TE-LSA [RFC5329]. Is that correct? ##PP more precisely, Maximum Reservable Link Bandwidth and Unreserved Bandwidth as RSVP-TE specific attributes are not allowed in ASLA TLV. These attributes MUST use TE Opaque LSAs. If so, it wasn't completely clear to me that the sub-TLVs defined in rfc3630 and rfc5329 continue to be advertised when using RSVP-TE/GMPLS. ##PP - all TLVs defined in rfc3630 and rfc5329 can continue to be advertised in legacy TE Opaque LSAs when used with RSVP-TE/GMPLS - Maximum Reservable Link and Bandwidth and Unreserved Bandwidth as RSVP-TE specific attributes MUST only use the TE Opaque LSAs and MUST never be advertised in ASLA. - we do support app bit in ASLA TLV for RSVP-TE. This allows attributes that are allowed to be advertised in ASLA TLV to be associated with RSVP-TE. - It might be worth including stronger wording in §2.1. ##PP there can not be a stronger wording. - Given that some of the sub-TLVs (from rfc3630 and rfc5329) are reused (§4.3 through §7), maybe it is worth providing some guidance on not using those if RSVP-TE is the only application, or avoiding their inclusion in the original LSAs. ##PP I added a new subsection in the "Deployment Considerations" to describe the above RSVP case and the case of Maximum Reservable Link Bandwidth and Unreserved Bandwidth/ 434 6. Local Interface IPv6 Address Sub-TLV [major] The Local/Remote Interface IPv6 Address Sub-TLVs (rfc5329) can include multiple addresses for a link. It seems to me that it could be possible for different applications to use different addresses. If that is the case, then it seems that these sub-TLVs should not be application independent. Why are they not considered to be application specific? [minor] Why are IPv4 addresses not considered? ##PP IPv4 local address is part of the basic spec. IPv6 remote address has been added in rfc8379. ... 460 8.1. Use of TE LSA Advertisements [c] I made the same comments in §5.1 of the ISIS draft. 462 Bit Identifers for Standard Applications are defined in Section 3. 463 All of the identifiers defined in this document are associated with 464 applications which were already deployed in some networks prior to 465 the writing of this document. Therefore, such applications have been 466 deployed using the TE LSA advertisements. The Standard Applications 467 defined in this document MAY continue to use TE LSA advertisements 468 for a given link so long as at least one of the following conditions 469 is true: [nit] s/Identifers/Identifiers ##PP fixed [major] Even if specifying the behavior for the Standard Applications, this document cannot Normatively specify anything affecting the case where "applications have been deployed using the legacy advertisements". s/MAY/may [] I think that the text in this section can be generalized to any application, not just ones defined in this document. s/The Standard Applications defined in this document MAY continue/The Standard Applications may continue ##PP I believe this has been closed during ISIS review. I also added a sentence at the end of this section to match ISIS. 471 The application is RSVP-TE 473 The application is SRTE or LFA and RSVP-TE is not deployed 474 anywhere in the network 476 The application is SRTE or LFA, RSVP-TE is deployed in the 477 network, and both the set of links on which SRTE and/or LFA 478 advertisements are required and the attribute values used by SRTE 479 and/or LFA on all such links is fully congruent with the links and 480 attribute values used by RSVP-TE [] To generalize: o A single application is deployed in the network o Multiple applications are deployed in the network and all the links and attribute values are fully congruent between them. 482 Under the conditions defined above, implementations which support the 483 extensions defined in this document have the choice of using TE LSA 484 advertisements or application specific advertisements in support of 485 SRTE and/or LFA. This will require implementations to provide 486 controls specifying which type of advertisements are to be sent/ 487 processed on receive for these applications. Further discussion of 488 the associated issues can be found in Section 10. [] To generalize: s/in support of SRTE and/or LFA/in support of other applications 490 New applications which future documents define to make use of the 491 advertisements defined in this document MUST NOT make use of TE LSA 492 advertisements. [major] Why not? Just as the cases above, the application may run my itself on the network, and/or the attributes may be fully congruent. ##PP again, this has been closed with ISIS. I updated accordingly. 494 8.2. Use of Zero Length Application Identifier Bit Masks [minor] This section is partially redundant with the behavior specified in §3. Please make the specification only once. ##PP removed from 3. 496 If link attributes are advertised associated with zero length 497 Application Identifier Bit-Masks for both standard applications and 498 user defined applications, then that set of link attributes MAY be 499 used by any application. If support for a new application is 500 introduced on any node in a network in the presence of such 501 advertisements, these advertisements MAY be used by the new 502 application. If this is not what is intended, then existing 503 advertisements MUST be readvertised with an explicit set of 504 applications specified before a new application is introduced. [major] s/MAY be used/may be used It is just a statement of fact... ##PP updated to match ISIS 506 9. Attribute Advertisements and Enablement [c] This section is pretty much the same in both drafts. Consider making the specification only once (maybe in the ISIS draft -- because the applications are defined there) and then referencing it. Note the generalization comment below. ##PP I believe it's good to keep it for readability. I made it same as in ISIS draft. ... 517 In the case of RSVP-TE, the advertisement of application specific 518 link attributes implies that RSVP is enabled on that link. The 519 absence of RSVP-TE application specific link attributes in 520 combination with the absence of legacy advertisements implies that 521 RSVP is NOT enabled on that link. [minor] Specifying by implication sounds confusing to me. Can we come up with Normative language to accompany the text above? Suggestion> The R-bit in the SABM MUST be set only if RSVP is enabled on the corresponding link. All RSVP-enabled links MUST have a corresponding link attributes advertisement. 523 In the case of SRTE, advertisement of application specific link 524 attributes does NOT indicate enablement of SRTE. The advertisements 525 are only used to support constraints which may be applied when 526 specifying an explicit path. SRTE is implicitly enabled on all links 527 which are part of the Segment Routing enabled topology independent of 528 the existence of link attribute advertisements. 530 In the case of LFA, advertisement of application specific link 531 attributes does NOT indicate enablement of LFA on that link. 532 Enablement is controlled by local configuration. 534 If, in the future, additional standard applications are defined to 535 use this mechanism, the specification defining this use MUST define 536 the relationship between application specific link attribute 537 advertisements and enablement for that application. [] To generalize: Suggestion> For Standard Applications, advertisement of application specific link attributes does NOT indicate enablement of the application on that link. If additional Standard Applications are defined with a different enablement expectation, then the corresponding specification MUST define the alternate relationship between application specific link attribute advertisements and enablement for that application. 539 This document allows the advertisement of application specific link 540 attributes with no application identifiers i.e., both the Standard 541 Application Identifier Bit-Mask and the User Defined Application Bit 542 Mask are not present (See Section 3). This supports the use of the 543 link attribute by any application. In the presence of an application 544 where the advertisement of link attribute advertisements is used to 545 infer the enablement of an application on that link (e.g., RSVP-TE), 546 the absence of the Application Identifier leaves ambiguous whether 547 that application is enabled on such a link. This needs to be 548 considered when making use of the "any application" encoding. [major] What does the use of the "any application" encoding say about RSVP-TE? My interpretation is that if RSVP-TE is used, then the "any application" encoding can't be used. Is that correct? Please be specific. ##PP I hope all the above comments were addressed by reusing ISIS text, which has been approved already. 550 10. Backward Compatibility [major] This section talks about the case where legacy advertisements are already in use. This document cannot Normatively define what those deployments do, because by definition they are not necessarily implementing this specification. IOW, phrases like "OSPF routers in that domain SHOULD continue to advertise" are out of place. [] Instead of trying to fix the text, I believe that the §8.1 already covers the scenarios discussed here. Also, please consider "importing" the 7.* sub-sections from the ISIS draft. ##PP done ... 556 In fact, there is at least one OSPF implementation that utilizes the 557 link attributes advertised in TE Opaque LSAs [RFC3630] for Non-RSVP 558 TE applications. For example, this implementation of LFA and remote 559 LFA utilizes links attributes such as Shared Risk Link Groups (SRLG) 560 [RFC4203] and Admin Group [[RFC3630] advertised in TE Opaque LSAs. 561 These applications are described in [RFC5286], [RFC7490], [RFC7916] 562 and [RFC8102]. [nit] s/Non-RSVP TE/Non-RSVP-TE 564 When an OSPF routing domain includes routers using link attributes 565 from the OSPFv2 TE Opaque LSAs or the OSPFv3 Intra-Area-TE-LSA for 566 Non-RSVP TE applications defined in this document (i.e. SRTE and 567 LFA), OSPF routers in that domain SHOULD continue to advertise such 568 OSPFv2 TE Opaque LSAs or the OSPFv3 Intra-Area-TE-LSA. In such a 569 deployment, the advertised attributes SHOULD be the same and Non- 570 RSVP application access to link attributes is a matter of local 571 policy. [nit] s/Non-RSVP TE/Non-RSVP-TE [nit] s/Non-RSVP/Non-RSVP-TE 573 When advertising link-attributes for any new applications other then 574 RSVP-TE, SRTE or LFA, OSPF routers MUST NOT use TE Opaque LSA or 575 OSPFv3 Intra-Area-TE-LSA. Instead, advertisement in the OSPFv2 576 Extended Link Attributes LSAs or OSPFv3 E-Router-LSA MUST be used. [major] (A similar statement was made in §8.1.) Why? Just as the cases from §8.1, the application may run my itself on the network, and/or the attributes may be fully congruent. 578 It is RECOMMENDED to advertise link-attributes for RSVP-TE in the 579 existing TE LSAs. [major] When is it ok to not do so? IOW, why isn't it "REQUIRED"? I'm asking this question as a matter of process, but the conditions laid out in §8.1 seems to already answer the question. As I mentioned above, the cases in this section seem to already be covered in §8.1. ##PP I hope all the above comments were addressed by reusing and modifying ISIS pieces as needed. 581 11. Security Considerations ... 591 Implementations MUST assure that malformed TLV and Sub-TLV defined in 592 this document are detected and do not provide a vulnerability for 593 attackers to crash the OSPF router or routing process. Reception of 594 a malformed TLV or Sub-TLV SHOULD be counted and/or logged for 595 further analysis. Logging of malformed TLVs and Sub-TLVs SHOULD be 596 rate-limited to prevent a Denial of Service (DoS) attack (distributed 597 or otherwise) from overloading the OSPF control plane. [major] "Implementations MUST assure that malformed TLV and Sub-TLV defined in this document are detected and do not provide a vulnerability for attackers to crash the OSPF router or routing process." How can this be Normatively enforced? How is the individual ability of an implementation to avoid crashes required for interoperability? IOW, I don't think you can use "MUST" in the sentence above. s/MUST/must ##PP Above text is used in several OSPF RFCs - rfc8476 being an example. I change to "must". [major] What about vulnerabilities introduced by this document? This document doesn't define new TE-related attributes, just a new way to advertise them...perhaps include something like this: This document defines a new way to advertise already defined TE Attributes. As the ASLA sub-TLV is not used for SPF computation or normal routing, the extensions specified here have no direct effect on IP routing. Tampering with the information defined in this document may have an effect on applications using it, including potential sub-optimal Traffic Engineering. This is not new...see [RFC5305], [RFC5307], [RFC6119], and [RFC8570]. And then there are other possible vulnerabilities introduced by the new encodings... For example, a rogue router can render the data unusable by setting the incorrect bit-mask... At best, this action could result in sub-optimal paths (by taking some links out of consideration)... Consider adding text related to that. ##PP I added the text similar to what is in the ISIS draft. 599 12. IANA Considerations 601 12.1. OSPFv2 603 OSPFv2 Extended Link TLV Sub-TLVs registry [RFC7684] defines sub-TLVs 604 at any level of nesting for OSPFv2 Extended Link TLVs. This 605 specification updates OSPFv2 Extended Link TLV sub-TLVs registry with 606 the following TLV types: [nit] s/OSPFv2 Extended Link TLV/The OSPFv2 Extended Link TLV ##PP done [major] s/This specification updates OSPFv2 Extended Link TLV sub-TLVs registry with the following TLV types:/IANA has assigned the following TLV types: ##PP done ... 633 12.2. OSPFv3 635 OSPFv3 Extended LSA Sub-TLV Registry [RFC8362] defines sub-TLVs at 636 any level of nesting for OSPFv3 Extended LSAs. This specification 637 updates OSPFv3 Extended LSA Sub-TLV Registry with the following TLV 638 types: [nit] s/OSPFv3 Extended LSA Sub-TLV/The OSPFv3 Extended LSA Sub-TLV ##PP done [major] s/This specification updates OSPFv3 Extended LSA Sub-TLV Registry with the following TLV types:/IANA has assigned the following TLV types: ##PP done ... 737 15.2. Informative References [major] These references should be Normative: ##PP done. thanks, Peter 739 [I-D.ietf-isis-te-app] 740 Ginsberg, L., Psenak, P., Previdi, S., Henderickx, W., and 741 J. Drake, "IS-IS TE Attributes per application", draft- 742 ietf-isis-te-app-08 (work in progress), October 2019. 744 [RFC2328] Moy, J., "OSPF Version 2", STD 54, RFC 2328, 745 DOI 10.17487/RFC2328, April 1998, 746 . 748 [RFC4203] Kompella, K., Ed. and Y. Rekhter, Ed., "OSPF Extensions in 749 Support of Generalized Multi-Protocol Label Switching 750 (GMPLS)", RFC 4203, DOI 10.17487/RFC4203, October 2005, 751 . ... 776 [RFC7471] Giacalone, S., Ward, D., Drake, J., Atlas, A., and S. 777 Previdi, "OSPF Traffic Engineering (TE) Metric 778 Extensions", RFC 7471, DOI 10.17487/RFC7471, March 2015, 779 . [Lsr] AD Review of draft-ietf-ospf-te-link-attr-r… Alvaro Retana From nobody Tue May 5 08:28:14 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 7168F3A08C0 for ; Tue, 5 May 2020 08:28:02 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.098 X-Spam-Level: X-Spam-Status: No, score=-2.098 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, UNPARSEABLE_RELAY=0.001, URIBL_BLOCKED=0.001] autolearn=unavailable autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=orange.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 7V6_X9rhg6YN for ; Tue, 5 May 2020 08:27:59 -0700 (PDT) Received: from relais-inet.orange.com (relais-inet.orange.com [80.12.70.36]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id D14623A0898 for ; Tue, 5 May 2020 08:27:58 -0700 (PDT) Received: from opfednr04.francetelecom.fr (unknown [xx.xx.xx.68]) by opfednr25.francetelecom.fr (ESMTP service) with ESMTP id 49GkBP2wwHzCrc1; Tue, 5 May 2020 17:27:57 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=orange.com; s=ORANGE001; t=1588692477; bh=q1Q/f6Hba0Spkhv5LVDytz8v+NtiZp6KdaQ/YW2Zq+4=; h=From:To:Subject:Date:Message-ID:Content-Type: Content-Transfer-Encoding:MIME-Version; b=f3GHiyYuzNv7V4QapLbPI5/7eanElmYrD7/UqPdPW0eplPSomDOBXLGjF5Dhn+Xo+ CrQKjKn8qezTSrZmx3yjK9g3u66nQjExamH74H9ccW2nOpaDPFnZs+qhQgyOoQ2R27 4VldZbyBH5GO606+ySLA42/z5P6LOWJCF6riZWpP5stGK9RJgW0CbxyzEcU0sRpojS 7dhcDcbrUOqnPLCZxi/DDsB5nJbXTQodSHwGi+TBKH7uC9KtEeN8OUS4AiqNTDrzO8 st+QIzQlQk4AlDN09zfjgoHF7sgVZOdWDDKjaZyOr8qJult3QpxMosARiq0LE5owu7 V/xUEzEiBWFoQ== Received: from Exchangemail-eme6.itn.ftgroup (unknown [xx.xx.13.29]) by opfednr04.francetelecom.fr (ESMTP service) with ESMTP id 49GkBP21D2z1xp9; Tue, 5 May 2020 17:27:57 +0200 (CEST) From: To: "Les Ginsberg (ginsberg)" , "lsr@ietf.org" Thread-Topic: Flooding across a network Thread-Index: AdYi7bsxcCpCOCQDSjylEJ0cQECozg== Date: Tue, 5 May 2020 15:27:56 +0000 Message-ID: <24209_1588692477_5EB185FD_24209_35_1_53C29892C857584299CBF5D05346208A48E3D455@OPEXCAUBM43.corporate.adroot.infra.ftgroup> Accept-Language: fr-FR, en-US Content-Language: fr-FR X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.114.13.247] Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Archived-At: Subject: [Lsr] Flooding across a network X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 05 May 2020 15:28:06 -0000 Les, > From: Lsr [mailto:lsr-bounces@ietf.org] On Behalf Of Les Ginsberg (ginsbe= rg) > Sent: Monday, May 4, 2020 4:39 PM [...] > when only some nodes in the network support faster flooding the behavior = of the whole network may not be "better" when faster flooding is enabled be= cause it prolongs the period of LSDB inconsistency.=20=20 1) Do you have data on this? 2) If not, can you provide an example where increasing the flooding rate on= one adjacency prolongs the period of LSDB inconsistency across the network? 3) In the meantime, let's try the theoretical analysis on a simple scenario= where a single LSP needs to be flooded across the network. - Let's call Dij the time needed to flood the LSP from node i to the adjace= nt node j. Clearly Dij>0. - Let's call k the node originating this LSP at t0=3D0s >From t0, the LSDB is inconsistent across the network as all nodes but k are= missing the LSP and hence only know about the 'old' topology. Let's call SPT(k) the SPT rooted on k, using Dij as the metric between adj= acent nodes i and j. Let's call SP(k,i) the shortest path from k to i; and = D(k,i) the shortest distance between k and i. It seems that the time needed: - for node j to learn about the LSP, and get in sync with k, is D(k,j) - for all nodes across the network to learn about the LSP, and get in sync = with k, is Max[for all j] D(k,j) Then how can reducing the flooding delay on one adjacency could prolongs th= e period of LSDB inconsistency? It seems to me that it can only improve/decrease it. Otherwise, this would = mean that decreasing the cost on a link can increase the cost of the shorte= st path. Note: I agree that there are other cases, such as multiple LSPs originated= by the same node, and multiple LSPs originated by multiple nodes, but let'= s start with the simple case.=20 Thanks, --Bruno > -----Original Message----- > From: Lsr [mailto:lsr-bounces@ietf.org] On Behalf Of Les Ginsberg (ginsbe= rg) > Sent: Monday, May 4, 2020 4:39 PM >=20 > Henk - >=20 > Thanx for your thoughtful posts. > I have read your later posts on this thread as well - but decided to repl= y to this one. > Top posting for better readability. >=20 > There is broad agreement that faster flooding is desirable. > There are now two proposals as to how to address the issue - neither of w= hich is proposing to use TCP (or equivalent). >=20 > I have commented on why IS-IS flooding requirements are significantly dif= ferent than that for which TCP is used. > I think it is also useful to note that even the simple test case which Br= uno reported on in last week's interim meeting demonstrated that without an= y changes to the protocol at all IS-IS was able to flood an order of magnit= ude faster than it commonly does today. > This gives me hope that we are looking at the problem correctly and will = not need "TCP". >=20 > Introducing a TCP based solution requires: >=20 > a)A major change to the adjacency formation logic >=20 > b)Removal of the independence of the IS-IS protocol from the address fami= lies whose reachability advertisements it supports - something which I thin= k is a great strength of the protocol - particularly in environments where = multiple address family support is needed >=20 > I really don't want to do either of the above. >=20 > Your comments regarding PSNP response times are quite correct - and both = of the draft proposals discuss this - though I agree more detail will be re= quired. > It is intuitive that if you want to flood faster you also need to ACK fas= ter - and probably even retransmit faster when that is needed. > The basic relationship between retransmit interval and PSNP interval is e= xpressed in ISO 10589: >=20 > " partialSNPInterval - This is the amount of time between periodic > action for transmission of Partial Sequence Number PDUs. > It shall be less than minimumLSPTransmission-Interval." >=20 > Of course ISO 10589 recommended values (2 seconds and 5 seconds respectiv= ely) associated with a much slower flooding rate and implementations I am a= ware of use values in this order of magnitude. These numbers need to be red= uced if we are to flood faster, but the relationship between the two needs = to remain the same. >=20 > It is also true - as you state - that sending ACKs more quickly will resu= lt in additional PDUs which need to be received/processed by IS-IS - and th= is has some impact. But I think it is reasonable to expect that an implemen= tation which can support sending and receiving LSPs at a faster rate should= also be able to send/receive PSNPs at a faster rate. But we still need to = be smarter than sending one PSNP/one LSP in cases where we have a burst. >=20 > LANs are a more difficult problem than P2P - and thus far draft-ginsberg-= lsr-isis-flooding-scale has been silent on this - but not because we aren't= aware of this - just have focused on the P2P behavior first. > What the best behavior on a LAN may be is something I am still considerin= g. Slowing flooding down to the speed at which the slowest IS on the LAN ca= n support may not be the best strategy - as it also slows down the propagat= ion rate for systems downstream from the nodes on the LAN which can handle = faster flooding - thereby having an impact on flooding speed throughout the= network in a way which may be out of proportion. This is a smaller example= of the larger issue that when only some nodes in the network support faste= r flooding the behavior of the whole network may not be "better" when faste= r flooding is enabled because it prolongs the period of LSDB inconsistency.= More work needs to be done here... >=20 > In summary, I don't expect to have to "reinvent TCP" - but I do think you= have provided a useful perspective for us to consider as we progress on th= is topic, >=20 > Thanx. >=20 > Les >=20 >=20 > > -----Original Message----- > > From: Lsr On Behalf Of Henk Smit > > Sent: Thursday, April 30, 2020 6:58 AM > > To: lsr@ietf.org > > Subject: [Lsr] Why only a congestion-avoidance algorithm on the sender = isn't > > enough > >=20 > >=20 > > Hello all, > >=20 > > Two years ago, Gunter Van de Velde and myself published this draft: > > https://tools.ietf.org/html/draft-hsmit-lsr-isis-flooding-over-tcp-00 > > That started this discussion about flow/congestion control and ISIS > > flooding. > >=20 > > My thoughts were that once we start implementing new algorithms to > > optimize ISIS flooding speed, we'll end up with our own version of TCP. > > I think most people here have a good general understanding of TCP. > > But if not, this is a good overview how TCP does it: > > https://en.wikipedia.org/wiki/TCP_congestion_control > >=20 > >=20 > > What does TCP do: > > =3D=3D=3D=3D > > TCP does 2 things: flow control and congestion control. > >=20 > > 1) Flow control is: the receiver trying to prevent itself from being > > overloaded. The receiver indicates, through the receiver-window-size > > in the TCP acks, how much data it can or wants to receive. > > 2) Congestion control is: the sender trying to prevent the links between > > sender and receiver from being overloaded. The sender makes an educated > > guess at what speed it can send. > >=20 > >=20 > > The part we seem to be missing: > > =3D=3D=3D=3D > > For the sender to make a guess at what speed it can send, it looks at > > how the transmission is behaving. Are there drops ? What is the RTT ? > > Do drop-percentage and RTT change ? Do acks come in at the same rate > > as the sender sends segments ? Are there duplicate acks ? To be able > > to do this, the sender must know what to expect. How acks behave. > >=20 > > If you want an ISIS sender to make a guess at what speed it can send, > > without changing the protocol, the only thing the sender can do is look > > at the PSNPs that come back from the receiver. But the RTT of PSNPs can > > not be predicted. Because a good ISIS implementation does not > > immediately > > send a PSNP when it receives a LSP. 1) the receiver should jitter the > > PSNP, > > like it should jitter all packets. And 2) the receiver should wait a > > little > > to see if it can combine multiple acks into a single PSNP packet. > >=20 > > In TCP, if a single segment gets lost, each new segment will cause the > > receiver to send an ack with the seqnr of the last received byte. This > > is called "duplicate acks". This triggers the sender to do > > fast-retransmission. In ISIS, this can't be be done. The information > > a sender can get from looking at incoming PSNPs is a lot less than what > > TCP can learn from incoming acks. > >=20 > >=20 > > The problem with sender-side congestion control: > > =3D=3D=3D=3D > > In ISIS, all we know is that the default retransmit-interval is 5 > > seconds. > > And I think most implementations use that as the default. This means > > that > > the receiver of an LSP has one requirement: send a PSNP within 5 > > seconds. > > For the rest, implementations are free to send PSNPs however and > > whenever > > they want. This means a sender can not really make conclusions about > > flooding speed, dropped LSPs, capacity of the receiver, etc. > > There is no ordering when flooding LSPs, or sending PSNPs. This makes > > a sender-side algorithm for ISIS a lot harder. > >=20 > > When you think about it, you realize that a sender should wait the > > full 5 seconds before it can make any real conclusions about dropped > > LSPs. > > If a sender looks at PSNPs to determine its flooding speed, it will > > probably > > not be able to react without a delay of a few seconds. A sender might > > send > > hunderds or thousands of LSPs in those 5 seconds, which might all or > > partially be dropped, complicating matters even further. > >=20 > >=20 > > A sender-sider algorithm should specify how to do PSNPs. > > =3D=3D=3D=3D > > So imho a sender-side only algorithm can't work just like that in a > > multi-vendor environment. We must not only specify a congestion-control > > algorithm for the sender. We must also specify for the receiver a more > > specific algorithm how and when to send PSNPs. At least how to do PSNPs > > under load. > >=20 > > Note that this might result in the receiver sending more (and smaller) > > PSNPs. > > More packets might mean more congestion (inside routers). > >=20 > >=20 > > Will receiver-side flow-control work ? > > =3D=3D=3D=3D > > I don't know if that's enough. It will certainly help. > >=20 > > I think to tackle this problem, we need 3 parts: > > 1) sender-side congestion-control algorithm > > 2) more detailed algorithm on receiver when and how to send PSNPs > > 3) receiver-side flow-control mechanism > >=20 > > As discussed at length, I don't know if the ISIS process on the > > receiving > > router can actually know if its running out of resources (buffers on > > interfaces, linecards, etc). That's implementation dependent. A receiver > > can definitely advertise a fixed value. So the sender has an upper bound > > to use when doing congestion-control. Just like TCP has both a > > flow-control > > window and a congestion-control window, and a sender uses both. Maybe > > the > > receiver can even advertise a dynamic value. Maybe now, maybe only in > > the > > future. An advertised upper limit seems useful to me today. > >=20 > >=20 > > What I didn't like about our own proposal (flooding over TCP): > > =3D=3D=3D=3D > > The problem I saw with flooding over TCP concerns multi-point networks > > (LANs). > >=20 > > When flooding over a multi-point network, setting up TCP connections > > introduces serious challenges. Who are the endpoints of the TCP > > connections ? > > Full mesh ? Or do all ISes on a LAN create a TCP-connection to the DIS ? > > There is no backup DIS in ISIS (unlike OSPF). Things get messy quickly. > >=20 > > However, the other two proposals do not solve this problem either. > > How will a sender-side congestion-avoidence algorithm determine whether > > there were drops ? There are no acks (PSNPs) on a LAN. We assume most > > LSPs > > that are broadcasted are received by all other ISes on the LAN. There > > are > > no acks. Only after the DIS has sent its periodic CSNPs, ISes can send > > PSNPs to request retransmissions. It seems impossible (or very hard) to > > me for all ISes on a LAN to keep track of dropped LSPs and adjust their > > sending speed accordingly. > >=20 > > When flooding on a LAN, the receiver-side algorithm seems best. Because > > all ISes can see what the lowest advertised sending-speed is. And make > > sure they send slow enough to not overload the slowest IS. I'm not sure > > this is a good solution, but is seems easier and more realistic than > > ISIS-flooding-over-TCP or sender-side congestion-avoidance. > >=20 > >=20 > > My conclusion: > > =3D=3D=3D=3D > > Sender-side congestion-control won't work without specifying in more > > detail how and when to send PSNPs. > > Receiver-side flow-control will certainly help. I dont' know if it's > > good enough. I don't know if advertising a static value is good enough. > > But it's a start. > >=20 > > I still think we'll end up re-implementing a new (and weaker) TCP. > >=20 > >=20 > > henk. > >=20 > > _______________________________________________ > > Lsr mailing list > > Lsr@ietf.org > > https://www.ietf.org/mailman/listinfo/lsr >=20 > _______________________________________________ > Lsr mailing list > Lsr@ietf.org > https://www.ietf.org/mailman/listinfo/lsr ___________________________________________________________________________= ______________________________________________ Ce message et ses pieces jointes peuvent contenir des informations confiden= tielles ou privilegiees et ne doivent donc pas etre diffuses, exploites ou copies sans autorisation. Si vous avez recu= ce message par erreur, veuillez le signaler a l'expediteur et le detruire ainsi que les pieces jointes. Les messages el= ectroniques etant susceptibles d'alteration, Orange decline toute responsabilite si ce message a ete altere, deforme ou = falsifie. Merci. This message and its attachments may contain confidential or privileged inf= ormation that may be protected by law; they should not be distributed, used or copied without authorisation. If you have received this email in error, please notify the sender and dele= te this message and its attachments. As emails may be altered, Orange is not liable for messages that have been = modified, changed or falsified. Thank you. 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Tue, 5 May 2020 23:35:16 +0000 From: "Les Ginsberg (ginsberg)" To: "bruno.decraene@orange.com" , "lsr@ietf.org" Thread-Topic: Flooding across a network Thread-Index: AdYi7bsxcCpCOCQDSjylEJ0cQECozgAREGJw Date: Tue, 5 May 2020 23:35:16 +0000 Message-ID: References: <24209_1588692477_5EB185FD_24209_35_1_53C29892C857584299CBF5D05346208A48E3D455@OPEXCAUBM43.corporate.adroot.infra.ftgroup> In-Reply-To: <24209_1588692477_5EB185FD_24209_35_1_53C29892C857584299CBF5D05346208A48E3D455@OPEXCAUBM43.corporate.adroot.infra.ftgroup> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: orange.com; dkim=none (message not signed) header.d=none;orange.com; dmarc=none action=none header.from=cisco.com; x-originating-ip: [2602:306:36ca:6640:6c65:1d24:8d69:db0d] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: e26435c8-1750-47ba-6b7b-08d7f14cf794 x-ms-traffictypediagnostic: MW3PR11MB4746: x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:10000; 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boundary="_000_MW3PR11MB46198A668B9F2532BCCC38FEC1A70MW3PR11MB4619namp_" MIME-Version: 1.0 X-MS-Exchange-CrossTenant-Network-Message-Id: e26435c8-1750-47ba-6b7b-08d7f14cf794 X-MS-Exchange-CrossTenant-originalarrivaltime: 05 May 2020 23:35:16.7830 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 5ae1af62-9505-4097-a69a-c1553ef7840e X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: qpt2QvcS4TAl/jer2IMi9XxXNKg/KkCRWJdmsVKvsdXZXbnOxGsPXfSZT9+w4/sEd0QNWFgzOfhAoY8rg6X1/A== X-MS-Exchange-Transport-CrossTenantHeadersStamped: MW3PR11MB4746 X-OriginatorOrg: cisco.com X-Outbound-SMTP-Client: 173.37.102.12, xch-rcd-002.cisco.com X-Outbound-Node: alln-core-1.cisco.com Archived-At: Subject: Re: [Lsr] Flooding across a network X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 05 May 2020 23:35:29 -0000 --_000_MW3PR11MB46198A668B9F2532BCCC38FEC1A70MW3PR11MB4619namp_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Bruno - Seems like it was not too long ago that we were discussing this in person. = Ahhh...the good old days... First, let's agree that the interesting case does not involve 1 or even a s= mall number of LSPs. For those cases flooding speed does not matter. The interesting cases involve a large number of LSPs (hundreds or thousands= ). And in such cases LFA/microloop avoidance techniques are not applicable. Take the following simple topology: | | ... | | +---+ +---+ | C | | E | +---+ +---+ | | 1000 +---+ +---+ | B |-------------| D | +---+ 1000 +---+ | | | | \ / \ / \ / \ / +---+ | A | +---+ There is a topology northbound of C and E (not shown) and a topology southb= ound of A (not shown). Cost on all links is 10 except B-D and D-E where cost is high. C is a node with 1000 neighbors. When all links are up, shortest path for all northbound destinations is via= C. All nodes in the network support fast flooding except for Node D. Let's say fast flooding is 500 LSPs/second and slow flooding (Node D) is 20= LSPs/seconds. If Node C fails we have 1000 LSPs to flood. All nodes except for D can receive these in 2 seconds (plus internode delay= time). D can receive LSPs in 50 seconds. When A and B and all southbound nodes receive/process the LSP updates they = will start sending traffic to Northbound destinations via D. But for the better part of 50 seconds, Node D has yet to receive all LSP up= dates and still believes that shortest path is via B-C. It will loop traffi= c. Had all nodes used slow flooding, it still would have taken 50 seconds to c= onverge, but there would be significantly less looping. There could be a go= od amount of blackholing, but this is preferable to looping. One can always come up with examples - based on a specific topology and a s= pecific failure - where things might be better/worse/unchanged in the face = of inconsistent flooding speed support. But I hope this simple example illustrates the pitfalls. Les > -----Original Message----- > From: bruno.decraene@orange.com > Sent: Tuesday, May 05, 2020 8:28 AM > To: Les Ginsberg (ginsberg) ; lsr@ietf.org > Subject: Flooding across a network > > Les, > > > From: Lsr [mailto:lsr-bounces@ietf.org] On Behalf Of Les Ginsberg > (ginsberg) > > Sent: Monday, May 4, 2020 4:39 PM > [...] > > when only some nodes in the network support faster flooding the behavio= r > of the whole network may not be "better" when faster flooding is enabled > because it prolongs the period of LSDB inconsistency. > > 1) Do you have data on this? > > 2) If not, can you provide an example where increasing the flooding rate = on > one adjacency prolongs the period of LSDB inconsistency across the > network? > > 3) In the meantime, let's try the theoretical analysis on a simple scenar= io > where a single LSP needs to be flooded across the network. > > - Let's call Dij the time needed to flood the LSP from node i to the adja= cent > node j. Clearly Dij>0. > - Let's call k the node originating this LSP at t0=3D0s > > >From t0, the LSDB is inconsistent across the network as all nodes but k = are > missing the LSP and hence only know about the 'old' topology. > > Let's call SPT(k) the SPT rooted on k, using Dij as the metric between > adjacent nodes i and j. Let's call SP(k,i) the shortest path from k to i;= and > D(k,i) the shortest distance between k and i. > > It seems that the time needed: > - for node j to learn about the LSP, and get in sync with k, is D(k,j) > - for all nodes across the network to learn about the LSP, and get in syn= c with > k, is Max[for all j] D(k,j) > > Then how can reducing the flooding delay on one adjacency could prolongs > the period of LSDB inconsistency? > It seems to me that it can only improve/decrease it. Otherwise, this woul= d > mean that decreasing the cost on a link can increase the cost of the shor= test > path. > > Note: I agree that there are other cases, such as multiple LSPs originat= ed by > the same node, and multiple LSPs originated by multiple nodes, but let's = start > with the simple case. > > Thanks, > --Bruno > > > -----Original Message----- > > From: Lsr [mailto:lsr-bounces@ietf.org] On Behalf Of Les Ginsberg > (ginsberg) > > Sent: Monday, May 4, 2020 4:39 PM > > > > Henk - > > > > Thanx for your thoughtful posts. > > I have read your later posts on this thread as well - but decided to re= ply to > this one. > > Top posting for better readability. > > > > There is broad agreement that faster flooding is desirable. > > There are now two proposals as to how to address the issue - neither of > which is proposing to use TCP (or equivalent). > > > > I have commented on why IS-IS flooding requirements are significantly > different than that for which TCP is used. > > I think it is also useful to note that even the simple test case which = Bruno > reported on in last week's interim meeting demonstrated that without any > changes to the protocol at all IS-IS was able to flood an order of magnit= ude > faster than it commonly does today. > > This gives me hope that we are looking at the problem correctly and wil= l not > need "TCP". > > > > Introducing a TCP based solution requires: > > > > a)A major change to the adjacency formation logic > > > > b)Removal of the independence of the IS-IS protocol from the address > families whose reachability advertisements it supports - something which = I > think is a great strength of the protocol - particularly in environments = where > multiple address family support is needed > > > > I really don't want to do either of the above. > > > > Your comments regarding PSNP response times are quite correct - and > both of the draft proposals discuss this - though I agree more detail wil= l be > required. > > It is intuitive that if you want to flood faster you also need to ACK f= aster - > and probably even retransmit faster when that is needed. > > The basic relationship between retransmit interval and PSNP interval is > expressed in ISO 10589: > > > > " partialSNPInterval - This is the amount of time between periodic > > action for transmission of Partial Sequence Number PDUs. > > It shall be less than minimumLSPTransmission-Interval." > > > > Of course ISO 10589 recommended values (2 seconds and 5 seconds > respectively) associated with a much slower flooding rate and > implementations I am aware of use values in this order of magnitude. Thes= e > numbers need to be reduced if we are to flood faster, but the relationshi= p > between the two needs to remain the same. > > > > It is also true - as you state - that sending ACKs more quickly will re= sult in > additional PDUs which need to be received/processed by IS-IS - and this h= as > some impact. But I think it is reasonable to expect that an implementatio= n > which can support sending and receiving LSPs at a faster rate should also= be > able to send/receive PSNPs at a faster rate. But we still need to be smar= ter > than sending one PSNP/one LSP in cases where we have a burst. > > > > LANs are a more difficult problem than P2P - and thus far draft-ginsber= g-lsr- > isis-flooding-scale has been silent on this - but not because we aren't a= ware > of this - just have focused on the P2P behavior first. > > What the best behavior on a LAN may be is something I am still consider= ing. > Slowing flooding down to the speed at which the slowest IS on the LAN can > support may not be the best strategy - as it also slows down the propagat= ion > rate for systems downstream from the nodes on the LAN which can handle > faster flooding - thereby having an impact on flooding speed throughout t= he > network in a way which may be out of proportion. This is a smaller exampl= e > of the larger issue that when only some nodes in the network support fast= er > flooding the behavior of the whole network may not be "better" when faste= r > flooding is enabled because it prolongs the period of LSDB inconsistency. > More work needs to be done here... > > > > In summary, I don't expect to have to "reinvent TCP" - but I do think y= ou > have provided a useful perspective for us to consider as we progress on t= his > topic, > > > > Thanx. > > > > Les > > > > > > > -----Original Message----- > > > From: Lsr > On Beha= lf Of Henk Smit > > > Sent: Thursday, April 30, 2020 6:58 AM > > > To: lsr@ietf.org > > > Subject: [Lsr] Why only a congestion-avoidance algorithm on the sende= r > isn't > > > enough > > > > > > > > > Hello all, > > > > > > Two years ago, Gunter Van de Velde and myself published this draft: > > > https://tools.ietf.org/html/draft-hsmit-lsr-isis-flooding-over-tcp-00 > > > That started this discussion about flow/congestion control and ISIS > > > flooding. > > > > > > My thoughts were that once we start implementing new algorithms to > > > optimize ISIS flooding speed, we'll end up with our own version of TC= P. > > > I think most people here have a good general understanding of TCP. > > > But if not, this is a good overview how TCP does it: > > > https://en.wikipedia.org/wiki/TCP_congestion_control > > > > > > > > > What does TCP do: > > > =3D=3D=3D=3D > > > TCP does 2 things: flow control and congestion control. > > > > > > 1) Flow control is: the receiver trying to prevent itself from being > > > overloaded. The receiver indicates, through the receiver-window-size > > > in the TCP acks, how much data it can or wants to receive. > > > 2) Congestion control is: the sender trying to prevent the links betw= een > > > sender and receiver from being overloaded. The sender makes an > educated > > > guess at what speed it can send. > > > > > > > > > The part we seem to be missing: > > > =3D=3D=3D=3D > > > For the sender to make a guess at what speed it can send, it looks at > > > how the transmission is behaving. Are there drops ? What is the RTT ? > > > Do drop-percentage and RTT change ? Do acks come in at the same rate > > > as the sender sends segments ? Are there duplicate acks ? To be able > > > to do this, the sender must know what to expect. How acks behave. > > > > > > If you want an ISIS sender to make a guess at what speed it can send, > > > without changing the protocol, the only thing the sender can do is lo= ok > > > at the PSNPs that come back from the receiver. But the RTT of PSNPs c= an > > > not be predicted. Because a good ISIS implementation does not > > > immediately > > > send a PSNP when it receives a LSP. 1) the receiver should jitter the > > > PSNP, > > > like it should jitter all packets. And 2) the receiver should wait a > > > little > > > to see if it can combine multiple acks into a single PSNP packet. > > > > > > In TCP, if a single segment gets lost, each new segment will cause th= e > > > receiver to send an ack with the seqnr of the last received byte. Thi= s > > > is called "duplicate acks". This triggers the sender to do > > > fast-retransmission. In ISIS, this can't be be done. The information > > > a sender can get from looking at incoming PSNPs is a lot less than wh= at > > > TCP can learn from incoming acks. > > > > > > > > > The problem with sender-side congestion control: > > > =3D=3D=3D=3D > > > In ISIS, all we know is that the default retransmit-interval is 5 > > > seconds. > > > And I think most implementations use that as the default. This means > > > that > > > the receiver of an LSP has one requirement: send a PSNP within 5 > > > seconds. > > > For the rest, implementations are free to send PSNPs however and > > > whenever > > > they want. This means a sender can not really make conclusions about > > > flooding speed, dropped LSPs, capacity of the receiver, etc. > > > There is no ordering when flooding LSPs, or sending PSNPs. This makes > > > a sender-side algorithm for ISIS a lot harder. > > > > > > When you think about it, you realize that a sender should wait the > > > full 5 seconds before it can make any real conclusions about dropped > > > LSPs. > > > If a sender looks at PSNPs to determine its flooding speed, it will > > > probably > > > not be able to react without a delay of a few seconds. A sender might > > > send > > > hunderds or thousands of LSPs in those 5 seconds, which might all or > > > partially be dropped, complicating matters even further. > > > > > > > > > A sender-sider algorithm should specify how to do PSNPs. > > > =3D=3D=3D=3D > > > So imho a sender-side only algorithm can't work just like that in a > > > multi-vendor environment. We must not only specify a congestion- > control > > > algorithm for the sender. We must also specify for the receiver a mor= e > > > specific algorithm how and when to send PSNPs. At least how to do > PSNPs > > > under load. > > > > > > Note that this might result in the receiver sending more (and smaller= ) > > > PSNPs. > > > More packets might mean more congestion (inside routers). > > > > > > > > > Will receiver-side flow-control work ? > > > =3D=3D=3D=3D > > > I don't know if that's enough. It will certainly help. > > > > > > I think to tackle this problem, we need 3 parts: > > > 1) sender-side congestion-control algorithm > > > 2) more detailed algorithm on receiver when and how to send PSNPs > > > 3) receiver-side flow-control mechanism > > > > > > As discussed at length, I don't know if the ISIS process on the > > > receiving > > > router can actually know if its running out of resources (buffers on > > > interfaces, linecards, etc). That's implementation dependent. A recei= ver > > > can definitely advertise a fixed value. So the sender has an upper bo= und > > > to use when doing congestion-control. Just like TCP has both a > > > flow-control > > > window and a congestion-control window, and a sender uses both. > Maybe > > > the > > > receiver can even advertise a dynamic value. Maybe now, maybe only in > > > the > > > future. An advertised upper limit seems useful to me today. > > > > > > > > > What I didn't like about our own proposal (flooding over TCP): > > > =3D=3D=3D=3D > > > The problem I saw with flooding over TCP concerns multi-point network= s > > > (LANs). > > > > > > When flooding over a multi-point network, setting up TCP connections > > > introduces serious challenges. Who are the endpoints of the TCP > > > connections ? > > > Full mesh ? Or do all ISes on a LAN create a TCP-connection to the DI= S ? > > > There is no backup DIS in ISIS (unlike OSPF). Things get messy quickl= y. > > > > > > However, the other two proposals do not solve this problem either. > > > How will a sender-side congestion-avoidence algorithm determine > whether > > > there were drops ? There are no acks (PSNPs) on a LAN. We assume most > > > LSPs > > > that are broadcasted are received by all other ISes on the LAN. There > > > are > > > no acks. Only after the DIS has sent its periodic CSNPs, ISes can sen= d > > > PSNPs to request retransmissions. It seems impossible (or very hard) = to > > > me for all ISes on a LAN to keep track of dropped LSPs and adjust the= ir > > > sending speed accordingly. > > > > > > When flooding on a LAN, the receiver-side algorithm seems best. > Because > > > all ISes can see what the lowest advertised sending-speed is. And mak= e > > > sure they send slow enough to not overload the slowest IS. I'm not su= re > > > this is a good solution, but is seems easier and more realistic than > > > ISIS-flooding-over-TCP or sender-side congestion-avoidance. > > > > > > > > > My conclusion: > > > =3D=3D=3D=3D > > > Sender-side congestion-control won't work without specifying in more > > > detail how and when to send PSNPs. > > > Receiver-side flow-control will certainly help. I dont' know if it's > > > good enough. I don't know if advertising a static value is good enoug= h. > > > But it's a start. > > > > > > I still think we'll end up re-implementing a new (and weaker) TCP. > > > > > > > > > henk. > > > > > > _______________________________________________ > > > Lsr mailing list > > > Lsr@ietf.org > > > https://www.ietf.org/mailman/listinfo/lsr > > > > _______________________________________________ > > Lsr mailing list > > Lsr@ietf.org > > https://www.ietf.org/mailman/listinfo/lsr > > __________________________________________________________ > __________________________________________________________ > _____ > > Ce message et ses pieces jointes peuvent contenir des informations > confidentielles ou privilegiees et ne doivent donc > pas etre diffuses, exploites ou copies sans autorisation. Si vous avez re= cu ce > message par erreur, veuillez le signaler > a l'expediteur et le detruire ainsi que les pieces jointes. Les messages > electroniques etant susceptibles d'alteration, > Orange decline toute responsabilite si ce message a ete altere, deforme o= u > falsifie. Merci. > > This message and its attachments may contain confidential or privileged > information that may be protected by law; > they should not be distributed, used or copied without authorisation. > If you have received this email in error, please notify the sender and de= lete > this message and its attachments. > As emails may be altered, Orange is not liable for messages that have bee= n > modified, changed or falsified. > Thank you. --_000_MW3PR11MB46198A668B9F2532BCCC38FEC1A70MW3PR11MB4619namp_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Bruno -

 

Seems like it was not too long ago that we were d= iscussing this in person.  Ahhh...the good old days...

 

First, let's agree that the interesting case does= not involve 1 or even a small number of LSPs. For those cases flooding spe= ed does not matter.

The interesting cases involve a large number of L= SPs (hundreds or thousands). And in such cases LFA/microloop avoidance tech= niques are not applicable.

 

Take the following simple topology:

 

   |  | ... |    =         |

     +---+  &n= bsp;          +---+

     | C |   &nbs= p;         | E |<= /b>

     +---+  &n= bsp;          +---+

       |  &n= bsp;            = ;  | 1000

     +---+  &n= bsp;          +---+

     | B |-------------| D |

     +---+   1= 000      +---+

       |  &n= bsp;            = ;  |

       |  &n= bsp;            = ;  |

        \ &n= bsp;            = ; /

         \&n= bsp;           /

        &nbs= p; \         /

        &nbs= p;  \      /

        &nbs= p;    +---+

        &nbs= p;    | A |

        &nbs= p;    +---+

 

There is a topology northbound of C and E (not sh= own) and a topology southbound of A (not shown).

Cost on all links is 10 except B-D and D-E where = cost is high.

 

C is a node with 1000 neighbors.

When all links are up, shortest path for all nort= hbound destinations is via C.

All nodes in the network support fast flooding ex= cept for Node D.

Let’s say fast flooding is 500 LSPs/second = and slow flooding (Node D) is 20 LSPs/seconds.

If  Node C fails we have 1000 LSPs to flood.=

All nodes except for D can receive these in 2 sec= onds (plus internode delay time).

D can receive LSPs in 50 seconds.

 

When A and B and all southbound nodes receive/pro= cess the LSP updates they will start sending traffic to Northbound destinat= ions via D.

But for the better part of 50 seconds, Node D has= yet to receive all LSP updates and still believes that shortest path is vi= a B-C. It will loop traffic.

 

Had all nodes used slow flooding, it still would = have taken 50 seconds to converge, but there would be significantly less lo= oping. There could be a good amount of blackholing, but this is preferable = to looping.

 

One can always come up with examples – base= d on a specific topology and a specific failure - where things might be bet= ter/worse/unchanged in the face of inconsistent flooding speed support.

But I hope this simple example illustrates the pi= tfalls.

 

    Les

 

> -----Original Message-----

> From: bruno.decraene@orange.com <bruno.de= craene@orange.com>

> Sent: Tuesday, May 05, 2020 8:28 AM

> To: Les Ginsberg (ginsberg) <ginsberg@cis= co.com>; lsr@ietf.org

> Subject: Flooding across a network

>

> Les,

>

> > From: Lsr [mailto:ls= r-bounces@ietf.org] On Behalf Of Les Ginsberg

> (ginsberg)

> > Sent: Monday, May 4, 2020 4:39 PM

> [...]

> > when only some nodes in the network sup= port faster flooding the behavior

> of the whole network may not be "better= " when faster flooding is enabled

> because it prolongs the period of LSDB incon= sistency.

>

> 1) Do you have data on this?

>

> 2) If not, can you provide an example where = increasing the flooding rate on

> one adjacency prolongs the period of LSDB in= consistency across the

> network?

>

> 3) In the meantime, let's try the theoretica= l analysis on a simple scenario

> where a single LSP needs to be flooded acros= s the network.

>

> - Let's call Dij the time needed to flood th= e LSP from node i to the adjacent

> node j. Clearly Dij>0.

> - Let's call k the node originating this LSP= at t0=3D0s

>

> >From t0, the LSDB is inconsistent across= the network as all nodes but k are

> missing the LSP and hence only know about th= e 'old' topology.

>

> Let's call  SPT(k) the SPT rooted on k,= using Dij as the metric between

> adjacent nodes i and j. Let's call SP(k,i) t= he shortest path from k to i; and

> D(k,i) the shortest distance between k and i= .

>

> It seems that the time needed:

> - for node j to learn about the LSP, and get= in sync with k, is D(k,j)

> - for all nodes across the network to learn = about the LSP, and get in sync with

> k, is Max[for all j] D(k,j)

>

> Then how can reducing the flooding delay on = one adjacency could prolongs

> the period of LSDB inconsistency?

> It seems to me that it can only improve/decr= ease it. Otherwise, this would

> mean that decreasing the cost on a link can = increase the cost of the shortest

> path.

>

> Note: I agree that there are other cases, su= ch as  multiple LSPs originated by

> the same node, and multiple LSPs originated = by multiple nodes, but let's start

> with the simple case.

>

> Thanks,

> --Bruno

>

> > -----Original Message-----

> > From: Lsr [mailto:ls= r-bounces@ietf.org] On Behalf Of Les Ginsberg

> (ginsberg)

> > Sent: Monday, May 4, 2020 4:39 PM

> >

> > Henk -

> >

> > Thanx for your thoughtful posts.

> > I have read your later posts on this th= read as well - but decided to reply to

> this one.

> > Top posting for better readability.

> >

> > There is broad agreement that faster fl= ooding is desirable.

> > There are now two proposals as to how t= o address the issue - neither of

> which is proposing to use TCP (or equivalent= ).

> >

> > I have commented on why IS-IS flooding = requirements are significantly

> different than that for which TCP is used.

> > I think it is also useful to note that = even the simple test case which Bruno

> reported on in last week's interim meeting d= emonstrated that without any

> changes to the protocol at all IS-IS was abl= e to flood an order of magnitude

> faster than it commonly does today.

> > This gives me hope that we are looking = at the problem correctly and will not

> need "TCP".

> >

> > Introducing a TCP based solution requir= es:

> >

> > a)A major change to the adjacency forma= tion logic

> >

> > b)Removal of the independence of the IS= -IS protocol from the address

> families whose reachability advertisements i= t supports - something which I

> think is a great strength of the protocol - = particularly in environments where

> multiple address family support is needed

> >

> > I really don't want to do either of the= above.

> >

> > Your comments regarding PSNP response t= imes are quite correct - and

> both of the draft proposals discuss this - t= hough I agree more detail will be

> required.

> > It is intuitive that if you want to flo= od faster you also need to ACK faster -

> and probably even retransmit faster when tha= t is needed.

> > The basic relationship between retransm= it interval and PSNP interval is

> expressed in ISO 10589:

> >

> > " partialSNPInterval - This is the= amount of time between periodic

>        &n= bsp;> action for transmission of Partial Sequence Number PDUs.

>        &n= bsp;> It shall be less than minimumLSPTransmission-Interval."

> >

> > Of course ISO 10589 recommended values = (2 seconds and 5 seconds

> respectively) associated with a much slower = flooding rate and

> implementations I am aware of use values in = this order of magnitude. These

> numbers need to be reduced if we are to floo= d faster, but the relationship

> between the two needs to remain the same.

> >

> > It is also true - as you state - that s= ending ACKs more quickly will result in

> additional PDUs which need to be received/pr= ocessed by IS-IS - and this has

> some impact. But I think it is reasonable to= expect that an implementation

> which can support sending and receiving LSPs= at a faster rate should also be

> able to send/receive PSNPs at a faster rate.= But we still need to be smarter

> than sending one PSNP/one LSP in cases where= we have a burst.

> >

> > LANs are a more difficult problem than = P2P - and thus far draft-ginsberg-lsr-

> isis-flooding-scale has been silent on this = - but not because we aren't aware

> of this - just have focused on the P2P behav= ior first.

> > What the best behavior on a LAN may be = is something I am still considering.

> Slowing flooding down to the speed at which = the slowest IS on the LAN can

> support may not be the best strategy - as it= also slows down the propagation

> rate for systems downstream from the nodes o= n the LAN which can handle

> faster flooding - thereby having an impact o= n flooding speed throughout the

> network in a way which may be out of proport= ion. This is a smaller example

> of the larger issue that when only some node= s in the network support faster

> flooding the behavior of the whole network m= ay not be "better" when faster

> flooding is enabled because it prolongs the = period of LSDB inconsistency.

> More work needs to be done here...

> >

> > In summary, I don't expect to have to &= quot;reinvent TCP" - but I do think you

> have provided a useful perspective for us to= consider as we progress on this

> topic,

> >

> > Thanx.

> >

>     > Les

> >

> >

> > > -----Original Message-----

> > > From: Lsr <l= sr-bounces@ietf.org> On Behalf Of Henk Smit

> > > Sent: Thursday, April 30, 2020 6:5= 8 AM

> > > To: lsr@ietf.org=

> > > Subject: [Lsr] Why only a congesti= on-avoidance algorithm on the sender

> isn't

> > > enough

> > >

> > >

> > > Hello all,

> > >

> > > Two years ago, Gunter Van de Velde= and myself published this draft:

> > > https://tools.ietf.or= g/html/draft-hsmit-lsr-isis-flooding-over-tcp-00

> > > That started this discussion about= flow/congestion control and ISIS

> > > flooding.

> > >

> > > My thoughts were that once we star= t implementing new algorithms to

> > > optimize ISIS flooding speed, we'l= l end up with our own version of TCP.

> > > I think most people here have a go= od general understanding of TCP.

> > > But if not, this is a good overvie= w how TCP does it:

> > > https://en.wikipedia.= org/wiki/TCP_congestion_control

> > >

> > >

> > > What does TCP do:

> > > =3D=3D=3D=3D

> > > TCP does 2 things: flow control an= d congestion control.

> > >

> > > 1) Flow control is: the receiver t= rying to prevent itself from being

> > > overloaded. The receiver indicates= , through the receiver-window-size

> > > in the TCP acks, how much data it = can or wants to receive.

> > > 2) Congestion control is: the send= er trying to prevent the links between

> > > sender and receiver from being ove= rloaded. The sender makes an

> educated

> > > guess at what speed it can send.

> > >

> > >

> > > The part we seem to be missing:

> > > =3D=3D=3D=3D

> > > For the sender to make a guess at = what speed it can send, it looks at

> > > how the transmission is behaving. = Are there drops ? What is the RTT ?

> > > Do drop-percentage and RTT change = ? Do acks come in at the same rate

> > > as the sender sends segments ? Are= there duplicate acks ? To be able

> > > to do this, the sender must know w= hat to expect. How acks behave.

> > >

> > > If you want an ISIS sender to make= a guess at what speed it can send,

> > > without changing the protocol, the= only thing the sender can do is look

> > > at the PSNPs that come back from t= he receiver. But the RTT of PSNPs can

> > > not be predicted. Because a good I= SIS implementation does not

> > > immediately

> > > send a PSNP when it receives a LSP= . 1) the receiver should jitter the

> > > PSNP,

> > > like it should jitter all packets.= And 2) the receiver should wait a

> > > little

> > > to see if it can combine multiple = acks into a single PSNP packet.

> > >

> > > In TCP, if a single segment gets l= ost, each new segment will cause the

> > > receiver to send an ack with the s= eqnr of the last received byte. This

> > > is called "duplicate acks&quo= t;. This triggers the sender to do

> > > fast-retransmission. In ISIS, this= can't be be done. The information

> > > a sender can get from looking at i= ncoming PSNPs is a lot less than what

> > > TCP can learn from incoming acks.<= /p>

> > >

> > >

> > > The problem with sender-side conge= stion control:

> > > =3D=3D=3D=3D

> > > In ISIS, all we know is that the d= efault retransmit-interval is 5

> > > seconds.

> > > And I think most implementations u= se that as the default. This means

> > > that

> > > the receiver of an LSP has one req= uirement: send a PSNP within 5

> > > seconds.

> > > For the rest, implementations are = free to send PSNPs however and

> > > whenever

> > > they want. This means a sender can= not really make conclusions about

> > > flooding speed, dropped LSPs, capa= city of the receiver, etc.

> > > There is no ordering when flooding= LSPs, or sending PSNPs. This makes

> > > a sender-side algorithm for ISIS a= lot harder.

> > >

> > > When you think about it, you reali= ze that a sender should wait the

> > > full 5 seconds before it can make = any real conclusions about dropped

> > > LSPs.

> > > If a sender looks at PSNPs to dete= rmine its flooding speed, it will

> > > probably

> > > not be able to react without a del= ay of a few seconds. A sender might

> > > send

> > > hunderds or thousands of LSPs in t= hose 5 seconds, which might all or

> > > partially be dropped, complicating= matters even further.

> > >

> > >

> > > A sender-sider algorithm should sp= ecify how to do PSNPs.

> > > =3D=3D=3D=3D

> > > So imho a sender-side only algorit= hm can't work just like that in a

> > > multi-vendor environment. We must = not only specify a congestion-

> control

> > > algorithm for the sender. We must = also specify for the receiver a more

> > > specific algorithm how and when to= send PSNPs. At least how to do

> PSNPs

> > > under load.

> > >

> > > Note that this might result in the= receiver sending more (and smaller)

> > > PSNPs.

> > > More packets might mean more conge= stion (inside routers).

> > >

> > >

> > > Will receiver-side flow-control wo= rk ?

> > > =3D=3D=3D=3D

> > > I don't know if that's enough. It = will certainly help.

> > >

> > > I think to tackle this problem, we= need 3 parts:

> > > 1) sender-side congestion-control = algorithm

> > > 2) more detailed algorithm on rece= iver when and how to send PSNPs

> > > 3) receiver-side flow-control mech= anism

> > >

> > > As discussed at length, I don't kn= ow if the ISIS process on the

> > > receiving

> > > router can actually know if its ru= nning out of resources (buffers on

> > > interfaces, linecards, etc). That'= s implementation dependent. A receiver

> > > can definitely advertise a fixed v= alue. So the sender has an upper bound

> > > to use when doing congestion-contr= ol. Just like TCP has both a

> > > flow-control

> > > window and a congestion-control wi= ndow, and a sender uses both.

> Maybe

> > > the

> > > receiver can even advertise a dyna= mic value. Maybe now, maybe only in

> > > the

> > > future. An advertised upper limit = seems useful to me today.

> > >

> > >

> > > What I didn't like about our own p= roposal (flooding over TCP):

> > > =3D=3D=3D=3D

> > > The problem I saw with flooding ov= er TCP concerns multi-point networks

> > > (LANs).

> > >

> > > When flooding over a multi-point n= etwork, setting up TCP connections

> > > introduces serious challenges. Who= are the endpoints of the TCP

> > > connections ?

> > > Full mesh ? Or do all ISes on a LA= N create a TCP-connection to the DIS ?

> > > There is no backup DIS in ISIS (un= like OSPF). Things get messy quickly.

> > >

> > > However, the other two proposals d= o not solve this problem either.

> > > How will a sender-side congestion-= avoidence algorithm determine

> whether

> > > there were drops ? There are no ac= ks (PSNPs) on a LAN. We assume most

> > > LSPs

> > > that are broadcasted are received = by all other ISes on the LAN. There

> > > are

> > > no acks. Only after the DIS has se= nt its periodic CSNPs, ISes can send

> > > PSNPs to request retransmissions. = It seems impossible (or very hard) to

> > > me for all ISes on a LAN to keep t= rack of dropped LSPs and adjust their

> > > sending speed accordingly.

> > >

> > > When flooding on a LAN, the receiv= er-side algorithm seems best.

> Because

> > > all ISes can see what the lowest a= dvertised sending-speed is. And make

> > > sure they send slow enough to not = overload the slowest IS. I'm not sure

> > > this is a good solution, but is se= ems easier and more realistic than

> > > ISIS-flooding-over-TCP or sender-s= ide congestion-avoidance.

> > >

> > >

> > > My conclusion:

> > > =3D=3D=3D=3D

> > > Sender-side congestion-control won= 't work without specifying in more

> > > detail how and when to send PSNPs.=

> > > Receiver-side flow-control will ce= rtainly help. I dont' know if it's

> > > good enough. I don't know if adver= tising a static value is good enough.

> > > But it's a start.

> > >

> > > I still think we'll end up re-impl= ementing a new (and weaker) TCP.

> > >

> > >

> > > henk.

> > >

> > > __________________________________= _____________

> > > Lsr mailing list

> > > Lsr@ietf.org=

> > > https://www.ietf.org/= mailman/listinfo/lsr

> >

> > _______________________________________= ________

> > Lsr mailing list

> > Lsr@ietf.org

> > https:= //www.ietf.org/mailman/listinfo/lsr

>

> ____________________________________________= ______________

> ____________________________________________= ______________

> _____

>

> Ce message et ses pieces jointes peuvent con= tenir des informations

> confidentielles ou privilegiees et ne doiven= t donc

> pas etre diffuses, exploites ou copies sans = autorisation. Si vous avez recu ce

> message par erreur, veuillez le signaler

> a l'expediteur et le detruire ainsi que les = pieces jointes. Les messages

> electroniques etant susceptibles d'alteratio= n,

> Orange decline toute responsabilite si ce me= ssage a ete altere, deforme ou

> falsifie. Merci.

>

> This message and its attachments may contain= confidential or privileged

> information that may be protected by law;

> they should not be distributed, used or copi= ed without authorisation.

> If you have received this email in error, pl= ease notify the sender and delete

> this message and its attachments.

> As emails may be altered, Orange is not liab= le for messages that have been

> modified, changed or falsified.

> Thank you.

 

--_000_MW3PR11MB46198A668B9F2532BCCC38FEC1A70MW3PR11MB4619namp_-- From nobody Tue May 5 17:04:23 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 465073A0C6B for ; Tue, 5 May 2020 17:04:17 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.088 X-Spam-Level: X-Spam-Status: No, score=-2.088 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_KAM_HTML_FONT_INVALID=0.01, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=raszuk.net Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id zgXHui9G9vVY for ; Tue, 5 May 2020 17:04:10 -0700 (PDT) Received: from mail-ed1-x529.google.com (mail-ed1-x529.google.com [IPv6:2a00:1450:4864:20::529]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id CED0E3A0CA4 for ; Tue, 5 May 2020 17:04:09 -0700 (PDT) Received: by mail-ed1-x529.google.com with SMTP id s10so392462edy.9 for ; Tue, 05 May 2020 17:04:09 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=raszuk.net; s=google; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=pipZJar9v5IzROJpiKBsgDilDWEj1MiLM8mDZiBFMb8=; b=YeUxK6QHQScNdXDr8pojOVDihgz8vTyZgOBipgo5o70471FUGhZdiUux/a5XmwZPpC M+otQYehK8z10yEvZKEOrffvkz5wnpi+2vZ0gfxfTRNtkDyyRgi9IMW+xZy0vYuecC/D 6cAFGh4NjqACwy09fkR7mnsX9xlyx1BuE2y6VaO6gYvGwxiTgjoc1C0LT860jy7lfSZf PJc0fG5ZhR7sp5T4le+n1boHE0CHYztkASrYGoe5trkhsvNQ5CFCeagLmhCmN081RIMf 2ixeyhil7n+XHJtm4urnCCW2SQEYtQd9UvQrQjXdcB38y2ZG0ZpjYL7WS/659XPBNKQ/ WVPg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=pipZJar9v5IzROJpiKBsgDilDWEj1MiLM8mDZiBFMb8=; b=oUBU7vBIUrfs5/X+s7j3DlciOMi7CTV1P0BTFvDUzY3wEoqtZC+spzBxhi4kI8+m4r WfPl04UuE5iyz+rCEzus9rU3ecGoPh2HcOIGip8qqMFSH7DHPyutdV4DRnsLARkF/Mh1 Wg+wq0m8GcRZOjf+nZchIf55s3NJOUvCcm0kjxmP/eUg46kf2bG09gLsMwUgHChV9m7d K+0qakQG3deRJqVuD2UGhd2uEqCUYLc5E5413VKLrNvZXlnKFP+Ilu7Fl1ftzvGP7wwH l36gaU48swSPXf6ewYdTtGyo8m1tS/O1E88Qe7KorkQ3u92saif4Kiix7cVI7V9GE+oW cPRg== X-Gm-Message-State: AGi0PuadhienM+o3Adjcx5hOQJJKreFeKFw9r5qjSg0xhq51BiRJp6ML PkNcmvqeep9WAb83Otqs9aaphuvUjeuGNS8Dc/4zmQ== X-Google-Smtp-Source: APiQypJZtK0201AnHJR4vQeJeTklk5OfHNZJMlGHSYI6RXP01p+hPj6/IUZeDXRhmt4wc8oiquWGdfrKchcIqKZkJn4= X-Received: by 2002:a05:6402:b4e:: with SMTP id bx14mr5036495edb.41.1588723448143; Tue, 05 May 2020 17:04:08 -0700 (PDT) MIME-Version: 1.0 References: <24209_1588692477_5EB185FD_24209_35_1_53C29892C857584299CBF5D05346208A48E3D455@OPEXCAUBM43.corporate.adroot.infra.ftgroup> In-Reply-To: From: Robert Raszuk Date: Wed, 6 May 2020 02:03:58 +0200 Message-ID: To: "Les Ginsberg (ginsberg)" Cc: "bruno.decraene@orange.com" , "lsr@ietf.org" Content-Type: multipart/alternative; boundary="000000000000c5f0bf05a4ef80bb" Archived-At: Subject: Re: [Lsr] Flooding across a network X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 06 May 2020 00:04:18 -0000 --000000000000c5f0bf05a4ef80bb Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hi Les, A side comment but your example shows another - one may say even much more serious issue. Assume we have LFA/TI-LFA enabled in the network and precomputed on B which get's activated and shifts traffic to E when detects that C is down. Detection is fast .. 10s-100s of milliseconds. Now if B converges fast and recomputes topology much faster then D it may remove protection and send packets to D natively. Well clearly as we established D is slow and will loop it back. That is why I mentioned the other day that a fast control plane is not always a good thing (I am sure many will say the opposite - but it is ok ;). But this proves that consistent convergence time in a domain is rather a good thing regardless if it takes 2 sec or 50 sec on all nodes. Best, Robert. On Wed, May 6, 2020 at 1:35 AM Les Ginsberg (ginsberg) wrote: > Bruno - > > > > Seems like it was not too long ago that we were discussing this in > person. Ahhh...the good old days... > > > > First, let's agree that the interesting case does not involve 1 or even a > small number of LSPs. For those cases flooding speed does not matter. > > The interesting cases involve a large number of LSPs (hundreds or > thousands). And in such cases LFA/microloop avoidance techniques are not > applicable. > > > > Take the following simple topology: > > > > * | | ... | |* > > * +---+ +---+* > > * | C | | E |* > > * +---+ +---+* > > * | | 1000* > > * +---+ +---+* > > * | B |-------------| D |* > > * +---+ 1000 +---+* > > * | |* > > * | |* > > * \ /* > > * \ /* > > * \ /* > > * \ /* > > * +---+* > > * | A |* > > * +---+* > > > > There is a topology northbound of C and E (not shown) and a topology > southbound of A (not shown). > > Cost on all links is 10 except B-D and D-E where cost is high. > > > > C is a node with 1000 neighbors. > > When all links are up, shortest path for all northbound destinations is > via C. > > All nodes in the network support fast flooding except for Node D. > > Let=E2=80=99s say fast flooding is 500 LSPs/second and slow flooding (Nod= e D) is > 20 LSPs/seconds. > > If Node C fails we have 1000 LSPs to flood. > > All nodes except for D can receive these in 2 seconds (plus internode > delay time). > > D can receive LSPs in 50 seconds. > > > > When A and B and all southbound nodes receive/process the LSP updates the= y > will start sending traffic to Northbound destinations via D. > > But for the better part of 50 seconds, Node D has yet to receive all LSP > updates and still believes that shortest path is via B-C. It will loop > traffic. > > > > Had all nodes used slow flooding, it still would have taken 50 seconds to > converge, but there would be significantly less looping. There could be a > good amount of blackholing, but this is preferable to looping. > > > > One can always come up with examples =E2=80=93 based on a specific topolo= gy and a > specific failure - where things might be better/worse/unchanged in the fa= ce > of inconsistent flooding speed support. > > But I hope this simple example illustrates the pitfalls. > > > > Les > > > > > -----Original Message----- > > > From: bruno.decraene@orange.com > > > Sent: Tuesday, May 05, 2020 8:28 AM > > > To: Les Ginsberg (ginsberg) ; lsr@ietf.org > > > Subject: Flooding across a network > > > > > > Les, > > > > > > > From: Lsr [mailto:lsr-bounces@ietf.org ] On > Behalf Of Les Ginsberg > > > (ginsberg) > > > > Sent: Monday, May 4, 2020 4:39 PM > > > [...] > > > > when only some nodes in the network support faster flooding the > behavior > > > of the whole network may not be "better" when faster flooding is enable= d > > > because it prolongs the period of LSDB inconsistency. > > > > > > 1) Do you have data on this? > > > > > > 2) If not, can you provide an example where increasing the flooding rat= e > on > > > one adjacency prolongs the period of LSDB inconsistency across the > > > network? > > > > > > 3) In the meantime, let's try the theoretical analysis on a simple > scenario > > > where a single LSP needs to be flooded across the network. > > > > > > - Let's call Dij the time needed to flood the LSP from node i to the > adjacent > > > node j. Clearly Dij>0. > > > - Let's call k the node originating this LSP at t0=3D0s > > > > > > >From t0, the LSDB is inconsistent across the network as all nodes but = k > are > > > missing the LSP and hence only know about the 'old' topology. > > > > > > Let's call SPT(k) the SPT rooted on k, using Dij as the metric between > > > adjacent nodes i and j. Let's call SP(k,i) the shortest path from k to > i; and > > > D(k,i) the shortest distance between k and i.. > > > > > > It seems that the time needed: > > > - for node j to learn about the LSP, and get in sync with k, is D(k,j) > > > - for all nodes across the network to learn about the LSP, and get in > sync with > > > k, is Max[for all j] D(k,j) > > > > > > Then how can reducing the flooding delay on one adjacency could prolong= s > > > the period of LSDB inconsistency? > > > It seems to me that it can only improve/decrease it. Otherwise, this > would > > > mean that decreasing the cost on a link can increase the cost of the > shortest > > > path. > > > > > > Note: I agree that there are other cases, such as multiple LSPs > originated by > > > the same node, and multiple LSPs originated by multiple nodes, but let'= s > start > > > with the simple case. > > > > > > Thanks, > > > --Bruno > > > > > > > -----Original Message----- > > > > From: Lsr [mailto:lsr-bounces@ietf.org ] On > Behalf Of Les Ginsberg > > > (ginsberg) > > > > Sent: Monday, May 4, 2020 4:39 PM > > > > > > > > Henk - > > > > > > > > Thanx for your thoughtful posts. > > > > I have read your later posts on this thread as well - but decided to > reply to > > > this one. > > > > Top posting for better readability. > > > > > > > > There is broad agreement that faster flooding is desirable. > > > > There are now two proposals as to how to address the issue - neither = of > > > which is proposing to use TCP (or equivalent). > > > > > > > > I have commented on why IS-IS flooding requirements are significantly > > > different than that for which TCP is used. > > > > I think it is also useful to note that even the simple test case whic= h > Bruno > > > reported on in last week's interim meeting demonstrated that without an= y > > > changes to the protocol at all IS-IS was able to flood an order of > magnitude > > > faster than it commonly does today. > > > > This gives me hope that we are looking at the problem correctly and > will not > > > need "TCP". > > > > > > > > Introducing a TCP based solution requires: > > > > > > > > a)A major change to the adjacency formation logic > > > > > > > > b)Removal of the independence of the IS-IS protocol from the address > > > families whose reachability advertisements it supports - something whic= h > I > > > think is a great strength of the protocol - particularly in environment= s > where > > > multiple address family support is needed > > > > > > > > I really don't want to do either of the above. > > > > > > > > Your comments regarding PSNP response times are quite correct - and > > > both of the draft proposals discuss this - though I agree more detail > will be > > > required. > > > > It is intuitive that if you want to flood faster you also need to ACK > faster - > > > and probably even retransmit faster when that is needed. > > > > The basic relationship between retransmit interval and PSNP interval = is > > > expressed in ISO 10589: > > > > > > > > " partialSNPInterval - This is the amount of time between periodic > > > > action for transmission of Partial Sequence Number PDUs. > > > > It shall be less than minimumLSPTransmission-Interval." > > > > > > > > Of course ISO 10589 recommended values (2 seconds and 5 seconds > > > respectively) associated with a much slower flooding rate and > > > implementations I am aware of use values in this order of magnitude. > These > > > numbers need to be reduced if we are to flood faster, but the > relationship > > > between the two needs to remain the same. > > > > > > > > It is also true - as you state - that sending ACKs more quickly will > result in > > > additional PDUs which need to be received/processed by IS-IS - and this > has > > > some impact. But I think it is reasonable to expect that an > implementation > > > which can support sending and receiving LSPs at a faster rate should > also be > > > able to send/receive PSNPs at a faster rate. But we still need to be > smarter > > > than sending one PSNP/one LSP in cases where we have a burst. > > > > > > > > LANs are a more difficult problem than P2P - and thus far > draft-ginsberg-lsr- > > > isis-flooding-scale has been silent on this - but not because we aren't > aware > > > of this - just have focused on the P2P behavior first. > > > > What the best behavior on a LAN may be is something I am still > considering. > > > Slowing flooding down to the speed at which the slowest IS on the LAN c= an > > > support may not be the best strategy - as it also slows down the > propagation > > > rate for systems downstream from the nodes on the LAN which can handle > > > faster flooding - thereby having an impact on flooding speed throughout > the > > > network in a way which may be out of proportion. This is a smaller > example > > > of the larger issue that when only some nodes in the network support > faster > > > flooding the behavior of the whole network may not be "better" when > faster > > > flooding is enabled because it prolongs the period of LSDB inconsistenc= y. > > > More work needs to be done here... > > > > > > > > In summary, I don't expect to have to "reinvent TCP" - but I do think > you > > > have provided a useful perspective for us to consider as we progress on > this > > > topic, > > > > > > > > Thanx. > > > > > > > > Les > > > > > > > > > > > > > -----Original Message----- > > > > > From: Lsr On Behalf Of Henk Smit > > > > > Sent: Thursday, April 30, 2020 6:58 AM > > > > > To: lsr@ietf.org > > > > > Subject: [Lsr] Why only a congestion-avoidance algorithm on the > sender > > > isn't > > > > > enough > > > > > > > > > > > > > > > Hello all, > > > > > > > > > > Two years ago, Gunter Van de Velde and myself published this draft: > > > > > > https://tools.ietf.org/html/draft-hsmit-lsr-isis-flooding-over-tcp-00 > > > > > That started this discussion about flow/congestion control and ISIS > > > > > flooding. > > > > > > > > > > My thoughts were that once we start implementing new algorithms to > > > > > optimize ISIS flooding speed, we'll end up with our own version of > TCP. > > > > > I think most people here have a good general understanding of TCP. > > > > > But if not, this is a good overview how TCP does it: > > > > > https://en.wikipedia.org/wiki/TCP_congestion_control > > > > > > > > > > > > > > > What does TCP do: > > > > > =3D=3D=3D=3D > > > > > TCP does 2 things: flow control and congestion control. > > > > > > > > > > 1) Flow control is: the receiver trying to prevent itself from bein= g > > > > > overloaded. The receiver indicates, through the receiver-window-siz= e > > > > > in the TCP acks, how much data it can or wants to receive. > > > > > 2) Congestion control is: the sender trying to prevent the links > between > > > > > sender and receiver from being overloaded. The sender makes an > > > educated > > > > > guess at what speed it can send. > > > > > > > > > > > > > > > The part we seem to be missing: > > > > > =3D=3D=3D=3D > > > > > For the sender to make a guess at what speed it can send, it looks = at > > > > > how the transmission is behaving. Are there drops ? What is the RTT= ? > > > > > Do drop-percentage and RTT change ? Do acks come in at the same rat= e > > > > > as the sender sends segments ? Are there duplicate acks ? To be abl= e > > > > > to do this, the sender must know what to expect. How acks behave. > > > > > > > > > > If you want an ISIS sender to make a guess at what speed it can sen= d, > > > > > without changing the protocol, the only thing the sender can do is > look > > > > > at the PSNPs that come back from the receiver. But the RTT of PSNPs > can > > > > > not be predicted. Because a good ISIS implementation does not > > > > > immediately > > > > > send a PSNP when it receives a LSP.. 1) the receiver should jitter > the > > > > > PSNP, > > > > > like it should jitter all packets. And 2) the receiver should wait = a > > > > > little > > > > > to see if it can combine multiple acks into a single PSNP packet. > > > > > > > > > > In TCP, if a single segment gets lost, each new segment will cause > the > > > > > receiver to send an ack with the seqnr of the last received byte. > This > > > > > is called "duplicate acks". This triggers the sender to do > > > > > fast-retransmission. In ISIS, this can't be be done. The informatio= n > > > > > a sender can get from looking at incoming PSNPs is a lot less than > what > > > > > TCP can learn from incoming acks. > > > > > > > > > > > > > > > The problem with sender-side congestion control: > > > > > =3D=3D=3D=3D > > > > > In ISIS, all we know is that the default retransmit-interval is 5 > > > > > seconds. > > > > > And I think most implementations use that as the default. This mean= s > > > > > that > > > > > the receiver of an LSP has one requirement: send a PSNP within 5 > > > > > seconds. > > > > > For the rest, implementations are free to send PSNPs however and > > > > > whenever > > > > > they want. This means a sender can not really make conclusions abou= t > > > > > flooding speed, dropped LSPs, capacity of the receiver, etc. > > > > > There is no ordering when flooding LSPs, or sending PSNPs. This mak= es > > > > > a sender-side algorithm for ISIS a lot harder. > > > > > > > > > > When you think about it, you realize that a sender should wait the > > > > > full 5 seconds before it can make any real conclusions about droppe= d > > > > > LSPs. > > > > > If a sender looks at PSNPs to determine its flooding speed, it will > > > > > probably > > > > > not be able to react without a delay of a few seconds. A sender mig= ht > > > > > send > > > > > hunderds or thousands of LSPs in those 5 seconds, which might all o= r > > > > > partially be dropped, complicating matters even further. > > > > > > > > > > > > > > > A sender-sider algorithm should specify how to do PSNPs. > > > > > =3D=3D=3D=3D > > > > > So imho a sender-side only algorithm can't work just like that in a > > > > > multi-vendor environment. We must not only specify a congestion- > > > control > > > > > algorithm for the sender. We must also specify for the receiver a > more > > > > > specific algorithm how and when to send PSNPs. At least how to do > > > PSNPs > > > > > under load. > > > > > > > > > > Note that this might result in the receiver sending more (and > smaller) > > > > > PSNPs. > > > > > More packets might mean more congestion (inside routers). > > > > > > > > > > > > > > > Will receiver-side flow-control work ? > > > > > =3D=3D=3D=3D > > > > > I don't know if that's enough. It will certainly help. > > > > > > > > > > I think to tackle this problem, we need 3 parts: > > > > > 1) sender-side congestion-control algorithm > > > > > 2) more detailed algorithm on receiver when and how to send PSNPs > > > > > 3) receiver-side flow-control mechanism > > > > > > > > > > As discussed at length, I don't know if the ISIS process on the > > > > > receiving > > > > > router can actually know if its running out of resources (buffers o= n > > > > > interfaces, linecards, etc). That's implementation dependent. A > receiver > > > > > can definitely advertise a fixed value. So the sender has an upper > bound > > > > > to use when doing congestion-control. Just like TCP has both a > > > > > flow-control > > > > > window and a congestion-control window, and a sender uses both. > > > Maybe > > > > > the > > > > > receiver can even advertise a dynamic value. Maybe now, maybe only = in > > > > > the > > > > > future. An advertised upper limit seems useful to me today. > > > > > > > > > > > > > > > What I didn't like about our own proposal (flooding over TCP): > > > > > =3D=3D=3D=3D > > > > > The problem I saw with flooding over TCP concerns multi-point > networks > > > > > (LANs). > > > > > > > > > > When flooding over a multi-point network, setting up TCP connection= s > > > > > introduces serious challenges. Who are the endpoints of the TCP > > > > > connections ? > > > > > Full mesh ? Or do all ISes on a LAN create a TCP-connection to the > DIS ? > > > > > There is no backup DIS in ISIS (unlike OSPF). Things get messy > quickly. > > > > > > > > > > However, the other two proposals do not solve this problem either. > > > > > How will a sender-side congestion-avoidence algorithm determine > > > whether > > > > > there were drops ? There are no acks (PSNPs) on a LAN. We assume mo= st > > > > > LSPs > > > > > that are broadcasted are received by all other ISes on the LAN. The= re > > > > > are > > > > > no acks. Only after the DIS has sent its periodic CSNPs, ISes can > send > > > > > PSNPs to request retransmissions. It seems impossible (or very hard= ) > to > > > > > me for all ISes on a LAN to keep track of dropped LSPs and adjust > their > > > > > sending speed accordingly. > > > > > > > > > > When flooding on a LAN, the receiver-side algorithm seems best. > > > Because > > > > > all ISes can see what the lowest advertised sending-speed is. And > make > > > > > sure they send slow enough to not overload the slowest IS. I'm not > sure > > > > > this is a good solution, but is seems easier and more realistic tha= n > > > > > ISIS-flooding-over-TCP or sender-side congestion-avoidance. > > > > > > > > > > > > > > > My conclusion: > > > > > =3D=3D=3D=3D > > > > > Sender-side congestion-control won't work without specifying in mor= e > > > > > detail how and when to send PSNPs. > > > > > Receiver-side flow-control will certainly help. I dont' know if it'= s > > > > > good enough. I don't know if advertising a static value is good > enough. > > > > > But it's a start. > > > > > > > > > > I still think we'll end up re-implementing a new (and weaker) TCP. > > > > > > > > > > > > > > > henk. > > > > > > > > > > _______________________________________________ > > > > > Lsr mailing list > > > > > Lsr@ietf.org > > > > > https://www.ietf.org/mailman/listinfo/lsr > > > > > > > > _______________________________________________ > > > > Lsr mailing list > > > > Lsr@ietf.org > > > > https://www.ietf.org/mailman/listinfo/lsr > > > > > > __________________________________________________________ > > > __________________________________________________________ > > > _____ > > > > > > Ce message et ses pieces jointes peuvent contenir des informations > > > confidentielles ou privilegiees et ne doivent donc > > > pas etre diffuses, exploites ou copies sans autorisation. Si vous avez > recu ce > > > message par erreur, veuillez le signaler > > > a l'expediteur et le detruire ainsi que les pieces jointes. Les message= s > > > electroniques etant susceptibles d'alteration, > > > Orange decline toute responsabilite si ce message a ete altere, deforme > ou > > > falsifie. Merci. > > > > > > This message and its attachments may contain confidential or privileged > > > information that may be protected by law; > > > they should not be distributed, used or copied without authorisation. > > > If you have received this email in error, please notify the sender and > delete > > > this message and its attachments. > > > As emails may be altered, Orange is not liable for messages that have > been > > > modified, changed or falsified. > > > Thank you. > > > _______________________________________________ > Lsr mailing list > Lsr@ietf.org > https://www.ietf.org/mailman/listinfo/lsr > --000000000000c5f0bf05a4ef80bb Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hi Les,

A side comment but your example= shows another - one may say even much more serious issue.=C2=A0
=
Assume we have LFA/TI-LFA enabled in the network and precomp= uted on B which get's activated and shifts traffic to E when detects th= at C is down. Detection is fast .. 10s-100s of milliseconds.=C2=A0

Now if B converges fast and recomputes topology much faste= r then D it may remove protection and send packets to D natively. Well clea= rly as we established D is slow and will loop it back.=C2=A0

=
That is why I mentioned the other day that a fast control plane = is not always a good thing (I am sure many will say the opposite - but it i= s ok ;).=C2=A0

But this proves that consistent con= vergence time in a domain is rather a good thing regardless if it takes 2 s= ec or 50 sec on all nodes.=C2=A0

Best,
R= obert.



On Wed, May 6, 2020 at 1:35 AM Le= s Ginsberg (ginsberg) <ginsberg=3D40cisco.com@dmarc.ietf.org> wrote:

Bruno -

=C2=A0

Seems like it was not too long ago that we were discussing this in perso= n.=C2=A0 Ahhh...the good old days...

=C2=A0

First, let's agree that the interesting case does not involve 1 or e= ven a small number of LSPs. For those cases flooding speed does not matter.=

The interesting cases involve a large number of LSPs (hundreds or thousa= nds). And in such cases LFA/microloop avoidance techniques are not applicab= le.

=C2=A0

Take the following simple topology:

=C2=A0

= =C2=A0=C2=A0 |=C2=A0 | ... |=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0 |

= =C2=A0=C2=A0=C2=A0=C2=A0 +---+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0 +---+

= =C2=A0=C2=A0=C2=A0=C2=A0 | C |=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0 | E |

= =C2=A0=C2=A0=C2=A0=C2=A0 +---+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0 +---+

= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 |=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =C2=A0| 1000<= u>

= =C2=A0=C2=A0=C2=A0=C2=A0 +---+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0 +---+

= =C2=A0=C2=A0=C2=A0=C2=A0 | B |-------------| D |

= =C2=A0=C2=A0=C2=A0=C2=A0 +---+ =C2=A0=C2=A01000=C2=A0=C2=A0=C2=A0 =C2=A0=C2= =A0+---+

= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 |=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 |

= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 |=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 |

= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 \=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 /

= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 \=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 /

= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 \=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 /

= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 \=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0 /

= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 +-= --+

= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 | = A |

= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 +-= --+

=C2=A0

There is a topology northbound of C and E (not shown) and a topology sou= thbound of A (not shown).

Cost on all links is 10 except B-D and D-E where cost is high.=

=C2=A0

C is a node with 1000 neighbors.

When all links are up, shortest path for all northbound destinations is = via C.

All nodes in the network support fast flooding except for Node D.=

Let=E2=80=99s say fast flooding is 500 LSPs/second and slow flooding (No= de D) is 20 LSPs/seconds.

If =C2=A0Node C fails we have 1000 LSPs to flood.

All nodes except for D can receive these in 2 seconds (plus internode de= lay time).

D can receive LSPs in 50 seconds.

=C2=A0

When A and B and all southbound nodes receive/process the LSP updates th= ey will start sending traffic to Northbound destinations via D.

But for the better part of 50 seconds, Node D has yet to receive all LSP= updates and still believes that shortest path is via B-C. It will loop tra= ffic.

=C2=A0

Had all nodes used slow flooding, it still would have taken 50 seconds t= o converge, but there would be significantly less looping. There could be a= good amount of blackholing, but this is preferable to looping.

=C2=A0

One can always come up with examples =E2=80=93 based on a specific topol= ogy and a specific failure - where things might be better/worse/unchanged i= n the face of inconsistent flooding speed support.

But I hope this simple example illustrates the pitfalls.

=C2=A0

=C2=A0=C2=A0=C2=A0 Les

=C2=A0

> -----Original Message-----

> From: bruno.decraene@orange.com <bruno.decraene@orange.com>

> Sent: Tuesday, May 05, 2020 8:28 AM

> To: Les Ginsberg (ginsberg) <ginsberg@cisco.com>; lsr@ietf.org

> Subject: Flooding across a network

>

> Les,

>

> > From: Lsr [mailto:lsr-bou= nces@ietf.org] On Behalf Of Les Ginsberg

> (ginsberg)

> > Sent: Monday, May 4, 2020 4:39 PM

> [...]

> > when only some nodes in the network support faster flooding th= e behavior

> of the whole network may not be "better" when faster floo= ding is enabled

> because it prolongs the period of LSDB inconsistency.

>

> 1) Do you have data on this?

>

> 2) If not, can you provide an example where increasing the flooding= rate on

> one adjacency prolongs the period of LSDB inconsistency across the<= /p>

> network?

>

> 3) In the meantime, let's try the theoretical analysis on a sim= ple scenario

> where a single LSP needs to be flooded across the network.

>

> - Let's call Dij the time needed to flood the LSP from node i t= o the adjacent

> node j. Clearly Dij>0.

> - Let's call k the node originating this LSP at t0=3D0s

>

> >From t0, the LSDB is inconsistent across the network as all nod= es but k are

> missing the LSP and hence only know about the 'old' topolog= y.

>

> Let's call=C2=A0 SPT(k) the SPT rooted on k, using Dij as the m= etric between

> adjacent nodes i and j. Let's call SP(k,i) the shortest path fr= om k to i; and

> D(k,i) the shortest distance between k and i..

>

> It seems that the time needed:

> - for node j to learn about the LSP, and get in sync with k, is D(k= ,j)

> - for all nodes across the network to learn about the LSP, and get = in sync with

> k, is Max[for all j] D(k,j)

>

> Then how can reducing the flooding delay on one adjacency could pro= longs

> the period of LSDB inconsistency?

> It seems to me that it can only improve/decrease it. Otherwise, thi= s would

> mean that decreasing the cost on a link can increase the cost of th= e shortest

> path.

>

> Note: I agree that there are other cases, such as=C2=A0 multiple LS= Ps originated by

> the same node, and multiple LSPs originated by multiple nodes, but = let's start

> with the simple case.

>

> Thanks,

> --Bruno

>

> > -----Original Message-----

> > From: Lsr [mailto:lsr-bou= nces@ietf.org] On Behalf Of Les Ginsberg

> (ginsberg)

> > Sent: Monday, May 4, 2020 4:39 PM

> >

> > Henk -

> >

> > Thanx for your thoughtful posts.

> > I have read your later posts on this thread as well - but deci= ded to reply to

> this one.

> > Top posting for better readability.

> >

> > There is broad agreement that faster flooding is desirable.

> > There are now two proposals as to how to address the issue - n= either of

> which is proposing to use TCP (or equivalent).

> >

> > I have commented on why IS-IS flooding requirements are signif= icantly

> different than that for which TCP is used.

> > I think it is also useful to note that even the simple test ca= se which Bruno

> reported on in last week's interim meeting demonstrated that wi= thout any

> changes to the protocol at all IS-IS was able to flood an order of = magnitude

> faster than it commonly does today.

> > This gives me hope that we are looking at the problem correctl= y and will not

> need "TCP".

> >

> > Introducing a TCP based solution requires:

> >

> > a)A major change to the adjacency formation logic

> >

> > b)Removal of the independence of the IS-IS protocol from the a= ddress

> families whose reachability advertisements it supports - something = which I

> think is a great strength of the protocol - particularly in environ= ments where

> multiple address family support is needed

> >

> > I really don't want to do either of the above.

> >

> > Your comments regarding PSNP response times are quite correct = - and

> both of the draft proposals discuss this - though I agree more deta= il will be

> required.

> > It is intuitive that if you want to flood faster you also need= to ACK faster -

> and probably even retransmit faster when that is needed.

> > The basic relationship between retransmit interval and PSNP in= terval is

> expressed in ISO 10589:

> >

> > " partialSNPInterval - This is the amount of time between= periodic

> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0> action for tra= nsmission of Partial Sequence Number PDUs.

> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0> It shall be le= ss than minimumLSPTransmission-Interval."

> >

> > Of course ISO 10589 recommended values (2 seconds and 5 second= s

> respectively) associated with a much slower flooding rate and

> implementations I am aware of use values in this order of magnitude= . These

> numbers need to be reduced if we are to flood faster, but the relat= ionship

> between the two needs to remain the same.

> >

> > It is also true - as you state - that sending ACKs more quickl= y will result in

> additional PDUs which need to be received/processed by IS-IS - and = this has

> some impact. But I think it is reasonable to expect that an impleme= ntation

> which can support sending and receiving LSPs at a faster rate shoul= d also be

> able to send/receive PSNPs at a faster rate. But we still need to b= e smarter

> than sending one PSNP/one LSP in cases where we have a burst.

> >

> > LANs are a more difficult problem than P2P - and thus far draf= t-ginsberg-lsr-

> isis-flooding-scale has been silent on this - but not because we ar= en't aware

> of this - just have focused on the P2P behavior first.

> > What the best behavior on a LAN may be is something I am still= considering.

> Slowing flooding down to the speed at which the slowest IS on the L= AN can

> support may not be the best strategy - as it also slows down the pr= opagation

> rate for systems downstream from the nodes on the LAN which can han= dle

> faster flooding - thereby having an impact on flooding speed throug= hout the

> network in a way which may be out of proportion. This is a smaller = example

> of the larger issue that when only some nodes in the network suppor= t faster

> flooding the behavior of the whole network may not be "better&= quot; when faster

> flooding is enabled because it prolongs the period of LSDB inconsis= tency.

> More work needs to be done here...

> >

> > In summary, I don't expect to have to "reinvent TCP&q= uot; - but I do think you

> have provided a useful perspective for us to consider as we progres= s on this

> topic,

> >

> > Thanx.

> >

> =C2=A0=C2=A0=C2=A0=C2=A0> Les

> >

> >

> > > -----Original Message-----

> > > From: Lsr <lsr-bo= unces@ietf.org> On Behalf Of Henk Smit

> > > Sent: Thursday, April 30, 2020 6:58 AM

> > > To: lsr@ietf.org<= /p>

> > > Subject: [Lsr] Why only a congestion-avoidance algorithm = on the sender

> isn't

> > > enough

> > >

> > >

> > > Hello all,

> > >

> > > Two years ago, Gunter Van de Velde and myself published t= his draft:

> > > https://tools.ietf.or= g/html/draft-hsmit-lsr-isis-flooding-over-tcp-00

> > > That started this discussion about flow/congestion contro= l and ISIS

> > > flooding.

> > >

> > > My thoughts were that once we start implementing new algo= rithms to

> > > optimize ISIS flooding speed, we'll end up with our o= wn version of TCP.

> > > I think most people here have a good general understandin= g of TCP.

> > > But if not, this is a good overview how TCP does it:

> > > https://en.wikipedia.= org/wiki/TCP_congestion_control

> > >

> > >

> > > What does TCP do:

> > > =3D=3D=3D=3D

> > > TCP does 2 things: flow control and congestion control.

> > >

> > > 1) Flow control is: the receiver trying to prevent itself= from being

> > > overloaded. The receiver indicates, through the receiver-= window-size

> > > in the TCP acks, how much data it can or wants to receive= .

> > > 2) Congestion control is: the sender trying to prevent th= e links between

> > > sender and receiver from being overloaded. The sender mak= es an

> educated

> > > guess at what speed it can send.

> > >

> > >

> > > The part we seem to be missing:

> > > =3D=3D=3D=3D

> > > For the sender to make a guess at what speed it can send,= it looks at

> > > how the transmission is behaving. Are there drops ? What = is the RTT ?

> > > Do drop-percentage and RTT change ? Do acks come in at th= e same rate

> > > as the sender sends segments ? Are there duplicate acks ?= To be able

> > > to do this, the sender must know what to expect. How acks= behave.

> > >

> > > If you want an ISIS sender to make a guess at what speed = it can send,

> > > without changing the protocol, the only thing the sender = can do is look

> > > at the PSNPs that come back from the receiver. But the RT= T of PSNPs can

> > > not be predicted. Because a good ISIS implementation does= not

> > > immediately

> > > send a PSNP when it receives a LSP.. 1) the receiver shou= ld jitter the

> > > PSNP,

> > > like it should jitter all packets. And 2) the receiver sh= ould wait a

> > > little

> > > to see if it can combine multiple acks into a single PSNP= packet.

> > >

> > > In TCP, if a single segment gets lost, each new segment w= ill cause the

> > > receiver to send an ack with the seqnr of the last receiv= ed byte. This

> > > is called "duplicate acks". This triggers the s= ender to do

> > > fast-retransmission. In ISIS, this can't be be done. = The information

> > > a sender can get from looking at incoming PSNPs is a lot = less than what

> > > TCP can learn from incoming acks.

> > >

> > >

> > > The problem with sender-side congestion control:

> > > =3D=3D=3D=3D

> > > In ISIS, all we know is that the default retransmit-inter= val is 5

> > > seconds.

> > > And I think most implementations use that as the default.= This means

> > > that

> > > the receiver of an LSP has one requirement: send a PSNP w= ithin 5

> > > seconds.

> > > For the rest, implementations are free to send PSNPs howe= ver and

> > > whenever

> > > they want. This means a sender can not really make conclu= sions about

> > > flooding speed, dropped LSPs, capacity of the receiver, e= tc.

> > > There is no ordering when flooding LSPs, or sending PSNPs= . This makes

> > > a sender-side algorithm for ISIS a lot harder.

> > >

> > > When you think about it, you realize that a sender should= wait the

> > > full 5 seconds before it can make any real conclusions ab= out dropped

> > > LSPs.

> > > If a sender looks at PSNPs to determine its flooding spee= d, it will

> > > probably

> > > not be able to react without a delay of a few seconds. A = sender might

> > > send

> > > hunderds or thousands of LSPs in those 5 seconds, which m= ight all or

> > > partially be dropped, complicating matters even further.<= /p>

> > >

> > >

> > > A sender-sider algorithm should specify how to do PSNPs.<= /p>

> > > =3D=3D=3D=3D

> > > So imho a sender-side only algorithm can't work just = like that in a

> > > multi-vendor environment. We must not only specify a cong= estion-

> control

> > > algorithm for the sender. We must also specify for the re= ceiver a more

> > > specific algorithm how and when to send PSNPs. At least h= ow to do

> PSNPs

> > > under load.

> > >

> > > Note that this might result in the receiver sending more = (and smaller)

> > > PSNPs.

> > > More packets might mean more congestion (inside routers).=

> > >

> > >

> > > Will receiver-side flow-control work ?

> > > =3D=3D=3D=3D

> > > I don't know if that's enough. It will certainly = help.

> > >

> > > I think to tackle this problem, we need 3 parts:

> > > 1) sender-side congestion-control algorithm

> > > 2) more detailed algorithm on receiver when and how to se= nd PSNPs

> > > 3) receiver-side flow-control mechanism

> > >

> > > As discussed at length, I don't know if the ISIS proc= ess on the

> > > receiving

> > > router can actually know if its running out of resources = (buffers on

> > > interfaces, linecards, etc). That's implementation de= pendent. A receiver

> > > can definitely advertise a fixed value. So the sender has= an upper bound

> > > to use when doing congestion-control. Just like TCP has b= oth a

> > > flow-control

> > > window and a congestion-control window, and a sender uses= both.

> Maybe

> > > the

> > > receiver can even advertise a dynamic value. Maybe now, m= aybe only in

> > > the

> > > future. An advertised upper limit seems useful to me toda= y.

> > >

> > >

> > > What I didn't like about our own proposal (flooding o= ver TCP):

> > > =3D=3D=3D=3D

> > > The problem I saw with flooding over TCP concerns multi-p= oint networks

> > > (LANs).

> > >

> > > When flooding over a multi-point network, setting up TCP = connections

> > > introduces serious challenges. Who are the endpoints of t= he TCP

> > > connections ?

> > > Full mesh ? Or do all ISes on a LAN create a TCP-connecti= on to the DIS ?

> > > There is no backup DIS in ISIS (unlike OSPF). Things get = messy quickly.

> > >

> > > However, the other two proposals do not solve this proble= m either.

> > > How will a sender-side congestion-avoidence algorithm det= ermine

> whether

> > > there were drops ? There are no acks (PSNPs) on a LAN. We= assume most

> > > LSPs

> > > that are broadcasted are received by all other ISes on th= e LAN. There

> > > are

> > > no acks. Only after the DIS has sent its periodic CSNPs, = ISes can send

> > > PSNPs to request retransmissions. It seems impossible (or= very hard) to

> > > me for all ISes on a LAN to keep track of dropped LSPs an= d adjust their

> > > sending speed accordingly.

> > >

> > > When flooding on a LAN, the receiver-side algorithm seems= best.

> Because

> > > all ISes can see what the lowest advertised sending-speed= is. And make

> > > sure they send slow enough to not overload the slowest IS= . I'm not sure

> > > this is a good solution, but is seems easier and more rea= listic than

> > > ISIS-flooding-over-TCP or sender-side congestion-avoidanc= e.

> > >

> > >

> > > My conclusion:

> > > =3D=3D=3D=3D

> > > Sender-side congestion-control won't work without spe= cifying in more

> > > detail how and when to send PSNPs.

> > > Receiver-side flow-control will certainly help. I dont= 9; know if it's

> > > good enough. I don't know if advertising a static val= ue is good enough.

> > > But it's a start.

> > >

> > > I still think we'll end up re-implementing a new (and= weaker) TCP.

> > >

> > >

> > > henk.

> > >

> > > _______________________________________________

> > > Lsr mailing list

> > > Lsr@ietf.org

> > > https://www.ietf.org/= mailman/listinfo/lsr

> >

> > _______________________________________________

> > Lsr mailing list

> > Lsr@ietf.org

> > https://w= ww.ietf.org/mailman/listinfo/lsr

>

> __________________________________________________________

> __________________________________________________________

> _____

>

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> confidentielles ou privilegiees et ne doivent donc

> pas etre diffuses, exploites ou copies sans autorisation. Si vous a= vez recu ce

> message par erreur, veuillez le signaler

> a l'expediteur et le detruire ainsi que les pieces jointes. Les= messages

> electroniques etant susceptibles d'alteration,

> Orange decline toute responsabilite si ce message a ete altere, def= orme ou

> falsifie. Merci.

>

> This message and its attachments may contain confidential or privil= eged

> information that may be protected by law;

> they should not be distributed, used or copied without authorisatio= n.

> If you have received this email in error, please notify the sender = and delete

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> Thank you.

=C2=A0

_______________________________________________
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https://www.ietf.org/mailman/listinfo/lsr
--000000000000c5f0bf05a4ef80bb-- From nobody Tue May 5 20:48:27 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id CC1583A0D21 for ; Tue, 5 May 2020 20:48:25 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.897 X-Spam-Level: X-Spam-Status: No, score=-1.897 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, SPF_HELO_NONE=0.001, SPF_NONE=0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id aOapX-VGaYRb for ; Tue, 5 May 2020 20:48:24 -0700 (PDT) Received: from smtp.chopps.org (smtp.chopps.org [54.88.81.56]) by ietfa.amsl.com (Postfix) with ESMTP id 0355C3A0D1E for ; Tue, 5 May 2020 20:48:23 -0700 (PDT) Received: from stubbs.int.chopps.org (047-050-069-038.biz.spectrum.com [47.50.69.38]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by smtp.chopps.org (Postfix) with ESMTPSA id 3599C61244; Wed, 6 May 2020 03:48:23 +0000 (UTC) Content-Type: text/plain; charset=us-ascii Mime-Version: 1.0 (Mac OS X Mail 13.4 \(3608.80.23.2.2\)) From: Christian Hopps In-Reply-To: Date: Tue, 5 May 2020 23:48:22 -0400 Cc: Christian Hopps , "Les Ginsberg (ginsberg)" , "bruno.decraene@orange.com" , "lsr@ietf.org" Content-Transfer-Encoding: quoted-printable Message-Id: <61EB462E-18EC-4F1D-8EF4-0EA126D5F7F6@chopps.org> References: <24209_1588692477_5EB185FD_24209_35_1_53C29892C857584299CBF5D05346208A48E3D455@OPEXCAUBM43.corporate.adroot.infra.ftgroup> To: Robert Raszuk X-Mailer: Apple Mail (2.3608.80.23.2.2) Archived-At: Subject: Re: [Lsr] Flooding across a network X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 06 May 2020 03:48:26 -0000 [as WG member] I think it would be more productive if we stay focused on trying to = improve flooding speed/efficiency here. How about let's get some of the = proposals being mulled over actually written, and provide some data, and = leave all the hand-wringing and theorizing about being too-successful = for after we've shown we could be? :) Thanks, Chris. > On May 5, 2020, at 8:03 PM, Robert Raszuk wrote: >=20 > But this proves that consistent convergence time in a domain is rather = a good thing regardless if it takes 2 sec or 50 sec on all nodes.=20 >=20 From nobody Tue May 5 21:59:09 2020 Return-Path: X-Original-To: lsr@ietf.org Delivered-To: lsr@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id 34A413A0DED; Tue, 5 May 2020 21:58:57 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit From: Barry Leiba via Datatracker To: "The IESG" Cc: draft-ietf-isis-mpls-elc@ietf.org, lsr-chairs@ietf.org, lsr@ietf.org, Acee Lindem , aretana.ietf@gmail.com, acee@cisco.com X-Test-IDTracker: no X-IETF-IDTracker: 6.129.0 Auto-Submitted: auto-generated Precedence: bulk Reply-To: Barry Leiba Message-ID: <158874113658.16071.17054286250715268005@ietfa.amsl.com> Date: Tue, 05 May 2020 21:58:57 -0700 Archived-At: Subject: [Lsr] Barry Leiba's No Objection on draft-ietf-isis-mpls-elc-12: (with COMMENT) X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 06 May 2020 04:59:04 -0000 Barry Leiba has entered the following ballot position for draft-ietf-isis-mpls-elc-12: No Objection When responding, please keep the subject line intact and reply to all email addresses included in the To and CC lines. (Feel free to cut this introductory paragraph, however.) Please refer to https://www.ietf.org/iesg/statement/discuss-criteria.html for more information about IESG DISCUSS and COMMENT positions. The document, along with other ballot positions, can be found here: https://datatracker.ietf.org/doc/draft-ietf-isis-mpls-elc/ ---------------------------------------------------------------------- COMMENT: ---------------------------------------------------------------------- Just a few editorial nits: — Section 1 — In cases where LSPs are used (e.g., SR-MPLS [RFC8660], it would be Nit: you need a closing parenthesis instead of the second comma. This capability, referred to as Entropy Readable Label Depth (ERLD) as defined in [RFC8662] may be used by ingress LSRs to Nit: this needs a comma after the citation. — Section 3 — originator. Similarly in a multi-domain network, the identity of the Nit: “Similarly” needs a comma after it. When a router propagates a prefix between ISIS levels ([RFC5302], it Nit: remove the open parenthesis. an Autonomous System Boundary Router (ASBR) is outside of the scope Nit: the abbreviation “ASBR” is not used elsewhere in the document, so there’s no reason to include it. — Section 4 — A new MSD-type [RFC8491], called ERLD-MSD is defined to advertise the Nit: 8491 capitalizes the “T” in “MSD-Type”. Nit: there needs to be a comma after “ERLD-MSD”. From nobody Tue May 5 22:12:56 2020 Return-Path: X-Original-To: lsr@ietf.org Delivered-To: lsr@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id BE5DD3A0D61; Tue, 5 May 2020 22:12:41 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit From: Barry Leiba via Datatracker To: "The IESG" Cc: draft-ietf-ospf-mpls-elc@ietf.org, lsr-chairs@ietf.org, lsr@ietf.org, Acee Lindem , aretana.ietf@gmail.com, acee@cisco.com X-Test-IDTracker: no X-IETF-IDTracker: 6.129.0 Auto-Submitted: auto-generated Precedence: bulk Reply-To: Barry Leiba Message-ID: <158874196172.28072.16634723092281391873@ietfa.amsl.com> Date: Tue, 05 May 2020 22:12:41 -0700 Archived-At: Subject: [Lsr] Barry Leiba's No Objection on draft-ietf-ospf-mpls-elc-13: (with COMMENT) X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 06 May 2020 05:12:42 -0000 Barry Leiba has entered the following ballot position for draft-ietf-ospf-mpls-elc-13: No Objection When responding, please keep the subject line intact and reply to all email addresses included in the To and CC lines. (Feel free to cut this introductory paragraph, however.) Please refer to https://www.ietf.org/iesg/statement/discuss-criteria.html for more information about IESG DISCUSS and COMMENT positions. The document, along with other ballot positions, can be found here: https://datatracker.ietf.org/doc/draft-ietf-ospf-mpls-elc/ ---------------------------------------------------------------------- COMMENT: ---------------------------------------------------------------------- — Section 1 — In cases where LSPs are used (e.g., SR-MPLS [RFC8660], it would be Nit: you need a closing parenthesis instead of the second comma. This capability, referred to as Entropy Readable Label Depth (ERLD) as defined in [RFC8662] may be used by ingress LSRs to Nit: this needs a comma after the citation. — Section 3 — When an OSPF Area Border Router (ABR) distributes information between Nit: the abbreviation “ABR” is not used elsewhere in the document, so there’s no reason to include it. — Section 3.1 — Prefix TLV includes a one octet Flags field. Nit: hyphenate “one-octet” as a compound modifier. — Section 4 — The ERLD is advertised in a Node MSD sub-TLV [RFC8476] using the ERLD-MSD type defined in [I-D.ietf-isis-mpls-elc]. Just checking: is the IS-IS draft the right reference here in this OSPF document? There does seem to be so much common text between that document and this one that I really don’t understand why these (the IS-IS and OSPF signaling) were not put into one document, and this reference really drives that home. From nobody Tue May 5 22:45:20 2020 Return-Path: X-Original-To: lsr@ietf.org Delivered-To: lsr@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id B39993A0D8E; Tue, 5 May 2020 22:44:49 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: Murray Kucherawy via Datatracker To: "The IESG" Cc: draft-ietf-isis-mpls-elc@ietf.org, lsr-chairs@ietf.org, lsr@ietf.org, Acee Lindem , aretana.ietf@gmail.com X-Test-IDTracker: no X-IETF-IDTracker: 6.129.0 Auto-Submitted: auto-generated Precedence: bulk Reply-To: Murray Kucherawy Message-ID: <158874388970.20061.11854189700851936433@ietfa.amsl.com> Date: Tue, 05 May 2020 22:44:49 -0700 Archived-At: Subject: [Lsr] Murray Kucherawy's No Objection on draft-ietf-isis-mpls-elc-12: (with COMMENT) X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 06 May 2020 05:44:50 -0000 Murray Kucherawy has entered the following ballot position for draft-ietf-isis-mpls-elc-12: No Objection When responding, please keep the subject line intact and reply to all email addresses included in the To and CC lines. (Feel free to cut this introductory paragraph, however.) Please refer to https://www.ietf.org/iesg/statement/discuss-criteria.html for more information about IESG DISCUSS and COMMENT positions. The document, along with other ballot positions, can be found here: https://datatracker.ietf.org/doc/draft-ietf-isis-mpls-elc/ ---------------------------------------------------------------------- COMMENT: ---------------------------------------------------------------------- What Barry said. Also, I presume your AD has approved going over the usual limit of five authors. From nobody Tue May 5 22:52:31 2020 Return-Path: X-Original-To: lsr@ietf.org Delivered-To: lsr@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id 12AFB3A005F; Tue, 5 May 2020 22:52:00 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: Murray Kucherawy via Datatracker To: "The IESG" Cc: draft-ietf-ospf-mpls-elc@ietf.org, lsr-chairs@ietf.org, lsr@ietf.org, Acee Lindem , aretana.ietf@gmail.com X-Test-IDTracker: no X-IETF-IDTracker: 6.129.0 Auto-Submitted: auto-generated Precedence: bulk Reply-To: Murray Kucherawy Message-ID: <158874432005.11799.17357260664387833460@ietfa.amsl.com> Date: Tue, 05 May 2020 22:52:00 -0700 Archived-At: Subject: [Lsr] Murray Kucherawy's No Objection on draft-ietf-ospf-mpls-elc-13: (with COMMENT) X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 06 May 2020 05:52:00 -0000 Murray Kucherawy has entered the following ballot position for draft-ietf-ospf-mpls-elc-13: No Objection When responding, please keep the subject line intact and reply to all email addresses included in the To and CC lines. (Feel free to cut this introductory paragraph, however.) Please refer to https://www.ietf.org/iesg/statement/discuss-criteria.html for more information about IESG DISCUSS and COMMENT positions. The document, along with other ballot positions, can be found here: https://datatracker.ietf.org/doc/draft-ietf-ospf-mpls-elc/ ---------------------------------------------------------------------- COMMENT: ---------------------------------------------------------------------- As with the IS-IS document, I assume the presence of six authors, above our usual limit of five, was approved by your AD. I agree with Barry's point that this document and the IS-IS document could easily have been combined. Even some of the syntactical things he corrected are present in both documents. When would you ever not do what the two SHOULDs in Section 3 say? From nobody Wed May 6 00:11:20 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id E61413A07A3 for ; Wed, 6 May 2020 00:11:18 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.898 X-Spam-Level: X-Spam-Status: No, score=-1.898 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id XJQgCOnZepYz for ; Wed, 6 May 2020 00:11:17 -0700 (PDT) Received: from huawei.com (lhrrgout.huawei.com [185.176.76.210]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id A42653A07A5 for ; Wed, 6 May 2020 00:11:17 -0700 (PDT) Received: from lhreml724-chm.china.huawei.com (unknown [172.18.7.107]) by Forcepoint Email with ESMTP id 92261B1B9D9B3743ECBC for ; Wed, 6 May 2020 08:11:15 +0100 (IST) Received: from dggeme701-chm.china.huawei.com (10.1.199.97) by lhreml724-chm.china.huawei.com (10.201.108.75) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256) id 15.1.1913.5; Wed, 6 May 2020 08:11:14 +0100 Received: from dggeme752-chm.china.huawei.com (10.3.19.98) by dggeme701-chm.china.huawei.com (10.1.199.97) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.1913.5; Wed, 6 May 2020 15:11:12 +0800 Received: from dggeme752-chm.china.huawei.com ([10.6.80.76]) by dggeme752-chm.china.huawei.com ([10.6.80.76]) with mapi id 15.01.1913.007; Wed, 6 May 2020 15:11:12 +0800 From: "Gengxuesong (Geng Xuesong)" To: "tony.li@tony.li" CC: Christian Hopps , "lsr@ietf.org" Thread-Topic: [Lsr] Congestion (flow) control thoughts. Thread-Index: AQHWHiEz1dI/yoz7M0KHaDn4nVfYx6iQ5nmAgABsaICACVON4A== Date: Wed, 6 May 2020 07:11:12 +0000 Message-ID: <21e4996c370b475db4eb4e7ffc298434@huawei.com> References: <8016231f9ff94bd2b0f5ef989608922f@huawei.com> In-Reply-To: Accept-Language: zh-CN, en-US Content-Language: zh-CN X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.108.148.72] Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 MIME-Version: 1.0 X-CFilter-Loop: Reflected Archived-At: Subject: Re: [Lsr] Congestion (flow) control thoughts. X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 06 May 2020 07:11:19 -0000 SGkgVG9ueSwNCg0KVGhhbmsgeW91IGZvciB5b3VyIGV4cGxhbmF0aW9uLiBQbGVhc2UgZmluZCBt eSBjb21tZW50cyBpbmxpbmUuDQoNCkJlc3QgUmVnYXJkcw0KWHVlc29uZw0KDQo+IC0tLS0tT3Jp Z2luYWwgTWVzc2FnZS0tLS0tDQo+IEZyb206IFRvbnkgTGkgW21haWx0bzp0b255MWF0aG9tZUBn bWFpbC5jb21dIE9uIEJlaGFsZiBPZiB0b255LmxpQHRvbnkubGkNCj4gU2VudDogRnJpZGF5LCBN YXkgMSwgMjAyMCAxMjoxNiBBTQ0KPiBUbzogR2VuZ3h1ZXNvbmcgKEdlbmcgWHVlc29uZykgPGdl bmd4dWVzb25nQGh1YXdlaS5jb20+DQo+IENjOiBDaHJpc3RpYW4gSG9wcHMgPGNob3Bwc0BjaG9w cHMub3JnPjsgbHNyQGlldGYub3JnDQo+IFN1YmplY3Q6IFJlOiBbTHNyXSBDb25nZXN0aW9uIChm bG93KSBjb250cm9sIHRob3VnaHRzLg0KPiAgDQo+IA0KPiBJIGNvbnNpZGVyIGZsb3cgY29udHJv bCBhbmQgY29uZ2VzdGlvbiBjb250cm9sIHRvIGJlIHNlcGFyYXRlLCBidXQgc2ltaWxhcg0KPiBw cm9ibGVtcy4NCj4gDQo+IEZsb3cgY29udHJvbCBpcyBhYm91dCBjcmVhdGluZyBhIHNpbmdsZSBj b250cm9sIGxvb3AgYmV0d2VlbiBhIHNpbmdsZQ0KPiB0cmFuc21pdHRlciBhbmQgc2luZ2xlIHJl Y2VpdmVyLg0KPiANCj4gQ29uZ2VzdGlvbiBjb250cm9sIGlzIGFib3V0IGNyZWF0aW5nIG11bHRp cGxlIGludGVyYWN0aW5nIGNvbnRyb2wgbG9vcHMgYmV0d2Vlbg0KPiBtdWx0aXBsZSB0cmFuc21p dHRlcnMgYW5kIG11bHRpcGxlIHJlY2VpdmVycy4NCg0KPFh1ZXNvbmc+IEkgdGhpbmsgdGhlcmUg aXMgbm8gbmVlZCB0byBkaXN0aW5ndWlzaCB0aGUgY29uY2VwdCBvZiBmbG93IGNvbnRyb2wgYW5k IGNvbmdlc3Rpb24gY29udHJvbCwgY29uc2lkZXJpbmcgdGhhdCB0aGUgY29yZSBpZGVhIGlzIHRo ZSBzYW1lOiBtb25pdG9yIHRoZSBzZW5kaW5nIHJhdGUgdG8gbWF0Y2ggdGhlIGNhcGFiaWxpdHkg b2YgdGhlIGJvdHRsZW5lY2ssIG5vIG1hdHRlciB0aGVyZSBhcmUgY29tcGV0aXRvcnMgb3Igbm90 LiBBbmQgdGhlIGNvbnRyb2wgbG9vcCBpcyBuZWNlc3NhcnkgaW4gYm90aCBjYXNlLiANCg0KPiBJ biBvdXIgZHJhZnQsIHdlIGFyZSBwcm9wb3Npbmcgb3RoZXIgZmVlZGJhY2sgbWVjaGFuaXNtcy4N Cg0KPFh1ZXNvbmc+IFRoYW5rIHlvdSBmb3IgZXhwbGFpbmluZyBhYm91dCB0aGUgYm90dGxlbmVj ayBvZiBmbG9vZGluZyBhbmQgZGlmZmVyZW50IGNjIHNvbHV0aW9ucyB0aGF0IGFyZSB1bmRlciBk aXNjdXNzaW9uLiBJdCBpcyBoZWxwZnVsIGFuZCBJIHdpbGwgcmVhZCB0aGUgZHJhZnRzLiANClRo ZXJlIGlzIHN0aWxsIG9uZSBtb3JlIHF1ZXN0aW9uIGxlZnQgaW4gdGhlIHByZXZpb3VzIGVtYWls OiAiIFdoYXQgaXMgdGhlIGNyaXRlcmlhIG9mIGNvbXBhcmluZyBkaWZmZXJlbnQgc29sdXRpb25z PyIuIEkgdGhpbmsgdGhpcyBpcyBjcnVjaWFsIGZvciBmdXJ0aGVyIGRpc2N1c3Npb24gYW5kIGNv bXBhcmF0aXZlIHRlc3RzLiBJIG5vdGljZSB0aGF0IGluIEJydW5vJ3MgZGF0YSwgc29tZSBwYXJh bWV0ZXJzIGFyZSBtZW50aW9uZWQsIHN1Y2ggYXMgIiBEdXJhdGlvbiIsIiBMU1Avc2Vjb25kIiwi IGF2ZyBpbnRlci1MU1AgZGVsYXkiLCAicmV0cmFuc21pc3Npb24gdGltZSIuIEknbSB3b25kZXJp bmcgd2hldGhlciBpdCBpcyBhYmxlIHRvIGNob29zZSBhIGJldHRlciBzb2x1dGlvbiB0aHJvdWdo IHRoZXNlIHBhcmFtZXRlcnMuIElmIG5vdCwgd2hhdCBzaG91bGQgYmUgYWRkZWQgb3IgY29uc2lk ZXJlZC4gKFNvbWUgb3RoZXIgaXNzdWVzIGFyZSBhbHNvIGNvbnNpZGVyZWQgd2hlbiBjaG9vc2lu ZyBjYyBtZWNoYW5pc20gaW4gbGF5ZXIgNCwgc3VjaCBhczogZmFpcm5lc3MgYW1vbmcgZmxvd3Ms IGNvLWV4aXN0ZW5jZSB3aXRoIG90aGVyIGNjIG1lY2hhbmlzbSAuLiApDQoNCg0KPiBUb255DQo+ IA0KDQo= From nobody Wed May 6 00:52:23 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id CD1DB3A045B for ; Wed, 6 May 2020 00:52:21 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.098 X-Spam-Level: X-Spam-Status: No, score=-2.098 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=unavailable autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=raszuk.net Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 8A24vLhBrfyh for ; Wed, 6 May 2020 00:52:19 -0700 (PDT) Received: from mail-ej1-x62c.google.com (mail-ej1-x62c.google.com [IPv6:2a00:1450:4864:20::62c]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 6B8583A044D for ; Wed, 6 May 2020 00:52:19 -0700 (PDT) Received: by mail-ej1-x62c.google.com with SMTP id pg17so526185ejb.9 for ; 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Wed, 06 May 2020 00:52:17 -0700 (PDT) MIME-Version: 1.0 References: <24209_1588692477_5EB185FD_24209_35_1_53C29892C857584299CBF5D05346208A48E3D455@OPEXCAUBM43.corporate.adroot.infra.ftgroup> <61EB462E-18EC-4F1D-8EF4-0EA126D5F7F6@chopps.org> In-Reply-To: <61EB462E-18EC-4F1D-8EF4-0EA126D5F7F6@chopps.org> From: Robert Raszuk Date: Wed, 6 May 2020 09:52:08 +0200 Message-ID: To: Christian Hopps Cc: "Les Ginsberg (ginsberg)" , "bruno.decraene@orange.com" , "lsr@ietf.org" Content-Type: multipart/alternative; boundary="000000000000079c3705a4f60b4f" Archived-At: Subject: Re: [Lsr] Flooding across a network X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 06 May 2020 07:52:22 -0000 --000000000000079c3705a4f60b4f Content-Type: text/plain; charset="UTF-8" Christian, It is not about "hand-wringing and theorizing about being too-successful". It is about impact to the overall network service when you make ISIS convergence not consistent across nodes of the topology, I think our goal is not to converge ISIS faster by improving flooding speed ... it is much more about how to deliver user packets with minimal disruption upon topology changes. Best, R. On Wed, May 6, 2020 at 5:48 AM Christian Hopps wrote: > [as WG member] > > I think it would be more productive if we stay focused on trying to > improve flooding speed/efficiency here. How about let's get some of the > proposals being mulled over actually written, and provide some data, and > leave all the hand-wringing and theorizing about being too-successful for > after we've shown we could be? :) > > Thanks, > Chris. > > > > On May 5, 2020, at 8:03 PM, Robert Raszuk wrote: > > > > But this proves that consistent convergence time in a domain is rather a > good thing regardless if it takes 2 sec or 50 sec on all nodes. > > > > --000000000000079c3705a4f60b4f Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Christian,

It is not about "hand-w= ringing and theorizing about being too-successful".=C2=A0
It is about impact to the overall network service when you mak= e ISIS convergence=C2=A0not consistent=C2=A0across nodes of the topology, I= think our goal is not to converge ISIS faster by improving flooding speed = ... it is much more about how to deliver user packets with minimal disrupti= on upon topology changes.=C2=A0

Best,
R.
<= /div>
O= n Wed, May 6, 2020 at 5:48 AM Christian Hopps <chopps@chopps.org> wrote:
[as WG member]

I think it would be more productive if we stay focused on trying to improve= flooding speed/efficiency here. How about let's get some of the propos= als being mulled over actually written, and provide some data, and leave al= l the hand-wringing and theorizing about being too-successful for after we&= #39;ve shown we could be? :)

Thanks,
Chris.


> On May 5, 2020, at 8:03 PM, Robert Raszuk <robert@raszuk.net> wrote:
>
> But this proves that consistent convergence time in a domain is rather= a good thing regardless if it takes 2 sec or 50 sec on all nodes.
>

--000000000000079c3705a4f60b4f-- From nobody Wed May 6 03:54:56 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 412103A0937; Wed, 6 May 2020 03:54:22 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.096 X-Spam-Level: X-Spam-Status: No, score=-2.096 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, UNPARSEABLE_RELAY=0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id rQOkIoxTUbR7; Wed, 6 May 2020 03:54:20 -0700 (PDT) Received: from mail-wm1-x330.google.com (mail-wm1-x330.google.com [IPv6:2a00:1450:4864:20::330]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 275B63A093A; Wed, 6 May 2020 03:54:20 -0700 (PDT) Received: by mail-wm1-x330.google.com with SMTP id x4so2077564wmj.1; Wed, 06 May 2020 03:54:20 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:in-reply-to:references:mime-version:date:message-id:subject:to :cc; bh=5q4NgTJiXirUV/ZmS0pZQkhxvzNgDA9LuD4FISLkRgQ=; b=N+H4QZr5xBeAGjE+s6KHZmnxj3hfZMNQ9UBzWOz4oMObQEXfRPgoDZCWh9jMyMJov2 vMYBhYvAYMMIkjgIhJJVDxKf6JgDzyTFXs4GwdZgCQjc2DOgJfRNCTivzwd705VbZmBd Lfjcs9vcqW4JMZFw6nGJCi9jXDJKMR5TBdSQE5hkUmTR4Xw3xdn23KpAfpCY6Tpsmmm5 jBD/LVxixVvWZv+JfDcRz6CuuGDhB4KeYT72fNE1l1rSKFWIi+D5Ob9YM7Bv5PMU1/sA 5rs+zMrHGClANWkv6XqTqm8BhW6hYkrwMnzTOYu560rAAEdygRWjcNba+/2pf+LXe8zC Jhgw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:in-reply-to:references:mime-version:date :message-id:subject:to:cc; bh=5q4NgTJiXirUV/ZmS0pZQkhxvzNgDA9LuD4FISLkRgQ=; b=aqK3tJAPO5YsxiJo+ep15CxWpuO92KJhdgic8m57kkfg0AeE7Nq2lGZoo2tVe9sfH8 9zXQ1tpEQ55xL+dptEH5f8k6+4Bfwo+yDqtw6Ioxt/ODWP2fkuGQjO7wZlzGJ/cHqin7 u1ZK4Yv2XTWXTuXEhYQW7qvJXDOfn5tuFG1L4QnOJXyYhU86AdLGzWGowH51xCO4wA1/ MJyg3fMmRMHbHZBLL54lDdc4YPZRmg+z4EsRzXf0Gw2e1WSA3LV/odpp+DM5MyASd7Uq NlKJ2VeDdrzwAR8HdNlL/Vvn6tEClegu7WNGY5e5Fr6kTXCYOvcZXlHfP3t82ap78aWA hnzQ== X-Gm-Message-State: AGi0PubSxb2uNwMriMKf1ze3nj/jpGM86ASo83bQe6KtcJOA/CM86K2n s+H5YHgroGDzA9g2ovqXmV8KS47T8Ej1NCivhBs= X-Google-Smtp-Source: APiQypI5oX5Li/eRAZSiosIO53U4Ts6VxLdvwhhjTWXy6n3D4xfAfsZZbs3Th4f89611D0EUabWQmfJ4WbUGdpySN88= X-Received: by 2002:a05:600c:28e:: with SMTP id 14mr3966184wmk.79.1588762458559; Wed, 06 May 2020 03:54:18 -0700 (PDT) Received: from 1058052472880 named unknown by gmailapi.google.com with HTTPREST; Wed, 6 May 2020 03:54:18 -0700 From: Alvaro Retana In-Reply-To: <158874388970.20061.11854189700851936433@ietfa.amsl.com> References: <158874388970.20061.11854189700851936433@ietfa.amsl.com> MIME-Version: 1.0 Date: Wed, 6 May 2020 03:54:18 -0700 Message-ID: To: Murray Kucherawy Cc: Acee Lindem , draft-ietf-isis-mpls-elc@ietf.org, lsr-chairs@ietf.org, lsr@ietf.org, The IESG Content-Type: multipart/alternative; boundary="000000000000f999bc05a4f895b5" Archived-At: Subject: Re: [Lsr] Murray Kucherawy's No Objection on draft-ietf-isis-mpls-elc-12: (with COMMENT) X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 06 May 2020 10:54:23 -0000 --000000000000f999bc05a4f895b5 Content-Type: text/plain; charset="UTF-8" Murray: Hi! Yes, I have. In this case, this document was the result of merging several other documents so it was decided to allow 6 authors (the rest became contributors). The same is true for the OSPF version. Thanks! Alvaro. On May 6, 2020 at 1:44:50 AM, Murray Kucherawy via Datatracker ( noreply@ietf.org) wrote: Also, I presume your AD has approved going over the usual limit of five authors. --000000000000f999bc05a4f895b5 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable =
Murray:

Hi!

Yes, I have.

In th= is case, this document was the result of merging several other documents so= it was decided to allow 6 authors (the rest became contributors). The same= is true for the OSPF version.

Thanks!

Alvaro.

On May 6, 2020 at 1:44:50 AM, Mu= rray Kucherawy via Datatracker (noreply= @ietf.org) wrote:

Also, I presume your AD has ap= proved going over the usual limit of five authors.=C2=A0
--000000000000f999bc05a4f895b5-- From nobody Wed May 6 04:06:55 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 883E43A0941; Wed, 6 May 2020 04:06:34 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.098 X-Spam-Level: X-Spam-Status: No, score=-2.098 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, UNPARSEABLE_RELAY=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id ZWfYa_zF8snO; Wed, 6 May 2020 04:06:32 -0700 (PDT) Received: from mail-wm1-x335.google.com (mail-wm1-x335.google.com [IPv6:2a00:1450:4864:20::335]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 1FBB53A0935; Wed, 6 May 2020 04:06:32 -0700 (PDT) Received: by mail-wm1-x335.google.com with SMTP id k12so2096403wmj.3; Wed, 06 May 2020 04:06:32 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:in-reply-to:references:mime-version:date:message-id:subject:to :cc:content-transfer-encoding; bh=VgH1kE+RQ7toEzMp0n9nh4PD5x4uuuqhwTY6FrS2UWw=; b=nbTi+wm6U+LYdbai5ZpSreE+EYmI6FnuPBZWI17o6OJCEt/ChcNNUBpgj72UisWnoR 3H4JX2utyvUnt5C0Qtw6AC2ZWqZS1s8D+mLM3yMW4grNfFM1Q5K3nbs1cNRLIq/2G3Im bl6BlIog+WHk7lB49BWB7hNg4BU7kkksEQMNc5QONBmGAKJLePT0rXoee5b1/E9AtTyh vPgEl6Zo0YDTsbhn7seOTky4F3oFkhvXnxEd/TVr1MrwGJ8DUtNnPL1mnUTTh2t+Cr0a mJpqmcm8+/3TufEEP3jw1kOvqeylQqVX7hm4SoMGtiulNiSY4x4uB6Qsac7jaqoRzIr2 33kQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:in-reply-to:references:mime-version:date :message-id:subject:to:cc:content-transfer-encoding; bh=VgH1kE+RQ7toEzMp0n9nh4PD5x4uuuqhwTY6FrS2UWw=; b=d0MtmWW+PFRUEV0RBiLx96VKZ1NoGOX7dFFCY0qR3/BffDfz+7DhXOzQ9abmQLQi6E MkYj/k4N1D+MuPs40M3K1SC6DllBOp9iegksNcVFW8bJEjXo/vOhQqOo5LRzFoXGeCpe ixyxNbmm9zJ6QEqe/sp0L2/pMZLoqy2p1jDIuw0TUmFd/A1oWRMtw9AUANQQOZ9R66fb bLY+2MunGNvgGwJ22YvqdyU8nTUrq3KhErQeZoKVS5edk/N94q7ME5FsB9mhqL2+2Td5 vDDXFNCTD9rJfalmPLzfpyIym764p4hs5K0Hw5uURe7NTaTe7ZJSv6JoA/bY5OCXMUQR BwKA== X-Gm-Message-State: AGi0PuanNGsg7PBSp7MpzJGgufb1SYJ94N8C0+IE4un8lrxgf/WxVSOo XnMyB2RoKUm7ArAhvEgR7RHvl1C/YCwhytEKslhOHBvk X-Google-Smtp-Source: APiQypJHTnm2ty4jp1lkUrPkPfvD9Er7EfIkhxWvDmdProQ08lMa+PXa+Rc90EFwm21zDqlqtijwSnYIsN1aYhWKOqg= X-Received: by 2002:a1c:f312:: with SMTP id q18mr3710315wmq.175.1588763190609; Wed, 06 May 2020 04:06:30 -0700 (PDT) Received: from 1058052472880 named unknown by gmailapi.google.com with HTTPREST; Wed, 6 May 2020 04:06:30 -0700 From: Alvaro Retana In-Reply-To: <158874196172.28072.16634723092281391873@ietfa.amsl.com> References: <158874196172.28072.16634723092281391873@ietfa.amsl.com> MIME-Version: 1.0 Date: Wed, 6 May 2020 04:06:30 -0700 Message-ID: To: Barry Leiba , The IESG , Barry Leiba via Datatracker Cc: Acee Lindem , lsr-chairs@ietf.org, lsr@ietf.org, draft-ietf-ospf-mpls-elc@ietf.org Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Archived-At: Subject: Re: [Lsr] Barry Leiba's No Objection on draft-ietf-ospf-mpls-elc-13: (with COMMENT) X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 06 May 2020 11:06:35 -0000 On May 6, 2020 at 1:12:42 AM, Barry Leiba wrote: Barry: Hi! > =E2=80=94 Section 4 =E2=80=94 > > The ERLD is advertised in a Node MSD sub-TLV [RFC8476] using the > ERLD-MSD type defined in [I-D.ietf-isis-mpls-elc]. > > Just checking: is the IS-IS draft the right reference here in this OSPF > document? Yes, it is. =C2=A0The new ERLD-MSD type is defined there for all routing pr= otocols. > There does seem to be so much common text between that document and this = one > that I really don=E2=80=99t understand why these (the IS-IS and OSPF sign= aling) were > not put into one document, and this reference really drives that home. One of the objectives of merging the (old) isis and ospf WGs into the lsr WG (this happened a couple of years ago) was to have common discussions about two IETF protocols that are similar: both are link state protocols, for example. However, they are different protocols and deployments use one or the other -- sometimes with religious-like fervor. We have discussed the prospect of having a single document specifying both OSPF and ISIS behavior, plus any corresponding BGP-LS extensions. Among other things, that could reduce the document load... =C2=A0However, the consensus in the WG is that the result of that would be potential confusion when it comes time to talk about the features supported or required in a specific network. =C2=A0For example, it is much clearer if an RFP requests support for rfcxxx than if it has to be specific about rfcxxx/Section y (where the desired protocol extension is specified), while not requiring Section z (for the other protocol). As a result we ended up with two documents. =C2=A0As a tradeoff, I've insisted in as much common language as possible and to process the two documents the same time when possible. Thanks! Alvaro. From nobody Wed May 6 04:40:37 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id CEBF53A08B5; Wed, 6 May 2020 04:40:25 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -9.601 X-Spam-Level: X-Spam-Status: No, score=-9.601 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIMWL_WL_MED=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, SPF_PASS=-0.001, URIBL_BLOCKED=0.001, USER_IN_DEF_DKIM_WL=-7.5] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=cisco.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id MxFeaN1eEF_x; Wed, 6 May 2020 04:40:23 -0700 (PDT) Received: from aer-iport-2.cisco.com (aer-iport-2.cisco.com [173.38.203.52]) (using TLSv1.2 with cipher DHE-RSA-SEED-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id BECEF3A0864; Wed, 6 May 2020 04:40:22 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=5342; q=dns/txt; s=iport; t=1588765223; x=1589974823; h=subject:to:cc:references:from:message-id:date: mime-version:in-reply-to:content-transfer-encoding; bh=7EWEw4dPco2atjWauSW5Kg+bdPmxj7ZQxnAG7P9wvWI=; b=PmODbNqywqFEGEQU/+6Ie9zfSdpO4FdDQoP4zOOjtJ8RsKHd+WxVn6DH y0xTdtnLKYyLAkND2SZ/wASkALslGXJK1py4PBaHWoGU3rjwkbuYeesA6 xM7+rTBA2rX4xmBXIIigeMdHnXWR3fs7l9ZfIVYRRX3+jFqjLtV+iC1Wg s=; X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: =?us-ascii?q?A0B2AABWobJe/xbLJq1mGgEBAQEBAQE?= =?us-ascii?q?BAQEDAQEBARIBAQEBAgIBAQEBQIFHgxhVIBIqBIQfiQGHYS2Zd4FnCwEBAQ4?= =?us-ascii?q?lCgQBAYREAoIlOBMCAwEBCwEBBQEBAQIBBQRthVYMhXEBAQEBAgEjDwEFQRA?= =?us-ascii?q?LFAQCAhEVAgJXBgEMCAEBgyIBglwgD7MDdoEyhD0CAQsCQAFCg0WBQIEOKoU?= =?us-ascii?q?sDoVrgTmBQT+BEAEngmk+glwLAgMBgRqBBoJTgmAEokuQBoJSgnCFKI94Bh2?= =?us-ascii?q?CW4EMh1WEVCeMaZAXiVSTcIFpIoFWMxoIGxWDJQhHGA2ZSIVEPwMyNQIGAQc?= =?us-ascii?q?BAQMJkkYBAQ?= X-IronPort-AV: E=Sophos;i="5.73,358,1583193600"; d="scan'208";a="25937824" Received: from aer-iport-nat.cisco.com (HELO aer-core-4.cisco.com) ([173.38.203.22]) by aer-iport-2.cisco.com with ESMTP/TLS/DHE-RSA-SEED-SHA; 06 May 2020 11:40:20 +0000 Received: from [10.60.140.51] (ams-ppsenak-nitro2.cisco.com [10.60.140.51]) by aer-core-4.cisco.com (8.15.2/8.15.2) with ESMTP id 046BeJws013796; Wed, 6 May 2020 11:40:20 GMT To: Dhruv Dhody , rtg-dir@ietf.org Cc: draft-ietf-ospf-mpls-elc.all@ietf.org, lsr@ietf.org, last-call@ietf.org References: <158867189453.14412.14632358918213286203@ietfa.amsl.com> From: Peter Psenak Message-ID: <8dd49248-84bd-a546-8fee-767ab75a182a@cisco.com> Date: Wed, 6 May 2020 13:40:19 +0200 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:60.0) Gecko/20100101 Thunderbird/60.7.0 MIME-Version: 1.0 In-Reply-To: <158867189453.14412.14632358918213286203@ietfa.amsl.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit X-Outbound-SMTP-Client: 10.60.140.51, ams-ppsenak-nitro2.cisco.com X-Outbound-Node: aer-core-4.cisco.com Archived-At: Subject: Re: [Lsr] Rtgdir last call review of draft-ietf-ospf-mpls-elc-13 X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 06 May 2020 11:40:26 -0000 Hi Dhruv, thanks, for your comments, please see inline: On 05/05/2020 11:44, Dhruv Dhody via Datatracker wrote: > Reviewer: Dhruv Dhody > Review result: Has Issues > > Hello, > > I have been selected as the Routing Directorate reviewer for this draft. The > Routing Directorate seeks to review all routing or routing-related drafts as > they pass through IETF last call and IESG review, and sometimes on special > request. The purpose of the review is to provide assistance to the Routing ADs. > For more information about the Routing Directorate, please see > ​http://trac.tools.ietf.org/area/rtg/trac/wiki/RtgDir > > Although these comments are primarily for the use of the Routing ADs, it would > be helpful if you could consider them along with any other IETF Last Call > comments that you receive, and strive to resolve them through discussion or by > updating the draft. > > Document: draft-ietf-ospf-mpls-elc-13 > Reviewer: Dhruv Dhody > Review Date: 2020-05-05 > IETF LC End Date: 2020-05-05 > Intended Status: Proposed Standard > > Summary: > I have some minor concerns about this document that I think should be resolved > before publication. > > Comments: > > Disclaimer: I reviewed an earlier version (-09) as part of the early > directorate review, which could be located at - > https://datatracker.ietf.org/doc/review-ietf-ospf-mpls-elc-09-rtgdir-early-dhody-2019-09-12/ > > I have reviewed this and the IS-IS I-D together and you will find similar > comments for both I-Ds. You could discuss them in one place. > > Major Issues: > None > > Minor Issues: > (1) Introduction > > Recently, mechanisms have been defined to signal labels via link- > state Interior Gateway Protocols (IGP) such as OSPFv2 [RFC8665] and > OSPFv3 [RFC8666]. > > Is there a better way to introduce OSPF extension for SR (than saying that > it is just an example to signal labels)? What about: Segment Routing with the MPLS Data Plane relies on Interior Gateway Protocols (IGP) such as OSPFv2 [RFC8665] and OSPFv3 [RFC8666] to signal labels. > > (2) Section 3 > > Query: The text says that the ABR "MUST" preserve the ELC setting where as > the ASBR "SHOULD" preserve it. What is the reason for using SHOULD in case > of ASBR? Maybe we can spell out in which case ASBR might not preserve the > ELC setting. redistribution is a local matter on the box and is not standardized, so it's quite hard to mandate a specific behavior. That's why SHOULD. > > (3) Section 4 > > The absence of ERLD-MSD advertisements indicates only that the > advertising node does not support advertisement of this capability. > > Do you mean to differentiate between support for the capability itself v/s > support for 'advertisement' only. But RFC 8662 says that ERLD value is > advertised only when following conditions are met: What is meant is that even though all the below conditions are set, if the node does not support the advertisement, one can not conclude what its ERLD is. If the node supports the advertisement of the ERLD, but the below conditions are not met, the node should not advertise the ELC capability in a first place. > > * MUST be entropy label capable and, as a consequence, MUST apply > the data-plane procedures defined in [RFC6790]. > > * MUST be able to read an ELI/EL, which is located within its ERLD > value. > > * MUST take into account an EL within the first ERLD labels in its > load-balancing function. > > Thus, I am not sure about this sentence. Maybe you mean to say that the > absence only indicates that the ERLD-MSD value of the node is unknown (and > it might still be capable of handling ELI/EL)? > > (4) Section 4 > > What would be the behavior if an OSPF router receives a ERLD of the node > but no ELC set for the corresponding prefix? That would be an error as per > RFC 8662, we should specify how one handles it within OSPF. If it is to > just ignore the ERLD, we should explicitly say that. the behavior is specified in the RFC 8662. OSPF is just a messenger, not the consumer of this information. > > Nits: > (1) Change OSPF Working group to LSR Working group in the metadata (first line > of the I-D) fixed. > > (2) Abstract - use term LSP instead of tunnel for consistency > > OLD: > An ingress Label > Switching Router (LSR) cannot insert ELs for packets going into a > given Label Switched Path (LSP) unless an egress LSR has indicated > via signaling that it has the capability to process ELs, referred to > as the Entropy Label Capability (ELC), on that tunnel. > NEW: > An ingress Label > Switching Router (LSR) cannot insert ELs for packets going into a > given Label Switched Path (LSP) unless an egress LSR has indicated > via signaling that it has the capability to process ELs, referred to > as the Entropy Label Capability (ELC), on that LSP. > END fixed. > > (3) Section 4 s/Node MSD sub-TLV/Node MSD TLV/ fixed. > > (4) Expand BGP-LS on first use. done. thanks, Peter > > Thanks! > Dhruv > > > > > From nobody Wed May 6 04:40:48 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 911CA3A099E; Wed, 6 May 2020 04:40:31 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -9.601 X-Spam-Level: X-Spam-Status: No, score=-9.601 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIMWL_WL_MED=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, SPF_PASS=-0.001, URIBL_BLOCKED=0.001, USER_IN_DEF_DKIM_WL=-7.5] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=cisco.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id AL4K6-9mGpEm; Wed, 6 May 2020 04:40:29 -0700 (PDT) Received: from aer-iport-3.cisco.com (aer-iport-3.cisco.com [173.38.203.53]) (using TLSv1.2 with cipher DHE-RSA-SEED-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 9F5473A0973; Wed, 6 May 2020 04:40:28 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=5464; q=dns/txt; s=iport; t=1588765229; x=1589974829; h=subject:to:cc:references:from:message-id:date: mime-version:in-reply-to:content-transfer-encoding; bh=55G0C78m0/MC23kYu4gWWyjTguVV1rp3MhT+NXffQ1M=; b=FW9ZjmtdEGeLtPpLz9gDtGh8WXrHHPOGztgnJOV2aUTuiE3bn1Rd1Eg7 8jmsMgaN931Hv/hM39k1/9BnXiPkCmeLzHDN4I4Hq+N4UbPYCVnpdk3SY /KntSD1gVD8Ua7bvpGvnLVl41VNEoR6ES9hxr2JOo+COr9pixZKw6AtF2 M=; X-IPAS-Result: =?us-ascii?q?A0B3AADFobJe/xbLJq1mGgEBAQEBAQEBAQEDAQEBARIBA?= =?us-ascii?q?QEBAgIBAQEBQIFHgxhVIBIqBIQfiQGHYQglmXeBZwsBAQEOJQoEAQGERAKCJ?= =?us-ascii?q?TgTAgMBAQEDAgMBAQEBBQEBAQIBBQRthVYMhXEBAQEBAgEjDwEFLxIQCxQEA?= =?us-ascii?q?gIRFQICVwYBDAgBAYMiAYJcIA+zA3aBMoQ9AgELAkABQoNFgUCBDiqFLA6Fa?= =?us-ascii?q?4E5gUE/gRABJwyCXT6CXAsCAwGBGoEGglOCYASiS5AGglKCcIUoj3gGHYJbg?= =?us-ascii?q?QyHVYRUJ4xpkBeJVJNwgWkigVYzGggbFYMlCEcYDZlIhUQ/AzI1AgYBBwEBA?= =?us-ascii?q?wmSRgEB?= X-IronPort-Anti-Spam-Filtered: true X-IronPort-AV: E=Sophos;i="5.73,358,1583193600"; d="scan'208";a="23606378" Received: from aer-iport-nat.cisco.com (HELO aer-core-2.cisco.com) ([173.38.203.22]) by aer-iport-3.cisco.com with ESMTP/TLS/DHE-RSA-SEED-SHA; 06 May 2020 11:40:20 +0000 Received: from [10.60.140.51] (ams-ppsenak-nitro2.cisco.com [10.60.140.51]) by aer-core-2.cisco.com (8.15.2/8.15.2) with ESMTP id 046BeJOV026397; Wed, 6 May 2020 11:40:19 GMT To: Dhruv Dhody , rtg-dir@ietf.org Cc: lsr@ietf.org, last-call@ietf.org, draft-ietf-isis-mpls-elc.all@ietf.org References: <158867180371.13174.5911030866330688420@ietfa.amsl.com> From: Peter Psenak Message-ID: Date: Wed, 6 May 2020 13:40:19 +0200 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:60.0) Gecko/20100101 Thunderbird/60.7.0 MIME-Version: 1.0 In-Reply-To: <158867180371.13174.5911030866330688420@ietfa.amsl.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit X-Outbound-SMTP-Client: 10.60.140.51, ams-ppsenak-nitro2.cisco.com X-Outbound-Node: aer-core-2.cisco.com Archived-At: Subject: Re: [Lsr] Rtgdir last call review of draft-ietf-isis-mpls-elc-12 X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 06 May 2020 11:40:36 -0000 Hi Dhruv, thanks, for your comments, please see inline: On 05/05/2020 11:43, Dhruv Dhody via Datatracker wrote: > Reviewer: Dhruv Dhody > Review result: Has Issues > > Hello, > > I have been selected as the Routing Directorate reviewer for this draft. The > Routing Directorate seeks to review all routing or routing-related drafts as > they pass through IETF last call and IESG review, and sometimes on special > request. The purpose of the review is to provide assistance to the Routing ADs. > For more information about the Routing Directorate, please see > ​http://trac.tools.ietf.org/area/rtg/trac/wiki/RtgDir > > Although these comments are primarily for the use of the Routing ADs, it would > be helpful if you could consider them along with any other IETF Last Call > comments that you receive, and strive to resolve them through discussion or by > updating the draft. > > Document: draft-ietf-isis-mpls-elc-12 > Reviewer: Dhruv Dhody > Review Date: 2020-05-05 > IETF LC End Date: 2020-05-05 > Intended Status: Proposed Standard > > Summary: > I have some minor concerns about this document that I think should be resolved > before publication. > > Comments: > Disclaimer: I reviewed an earlier version (-08) as part of the early > directorate review, which could be located at - > https://datatracker.ietf.org/doc/review-ietf-isis-mpls-elc-08-rtgdir-early-dhody-2019-09-12/ > > I have reviewed this and the OSPF I-D together and you will find similar > comments for both I-Ds. You could discuss them in one place. > > Major Issues: > None > > Minor Issues: > > (1) Introduction > > Recently, mechanisms have been defined to signal labels via link- > state Interior Gateway Protocols (IGP) such as IS-IS [RFC8667]. > > Is there a better way to introduce IS-IS extension for SR (than saying that > it is just an example to signal labels)? What about: Segment Routing with the MPLS Data Plane relies on Interior Gateway Protocols (IGP) such as IS-IS [RFC8667] to signal labels. > > (2) Section 3 > > Query: The text says that the ABR "MUST" preserve the ELC setting where as > the ASBR "SHOULD" preserve it. What is the reason for using SHOULD in case > of ASBR? Maybe we can spell out in which case ASBR might not preserve the > ELC setting. redistribution is a local matter on the box and is not standardized, so it's quite hard to mandate a specific behavior. That's why SHOULD. > > (3) Section 4 > > The absence of ERLD-MSD advertisements indicates only that the > advertising node does not support advertisement of this capability. > > Do you mean to differentiate between support for the capability itself v/s > support for 'advertisement' only. But RFC 8662 says that ERLD value is > advertised only when following conditions are met: What is meant is that even though all the below conditions are set, if the node does not support the advertisement, one can not conclude what its ERLD is. If the node supports the advertisement of the ERLD, but the below conditions are not met, the node should not advertise the ELC capability in a first place. > > * MUST be entropy label capable and, as a consequence, MUST apply > the data-plane procedures defined in [RFC6790]. > > * MUST be able to read an ELI/EL, which is located within its ERLD > value. > > * MUST take into account an EL within the first ERLD labels in its > load-balancing function. > > Thus, I am not sure about this sentence. Maybe you mean to say that the > absence only indicates that the ERLD-MSD value of the node is unknown (and > it might still be capable of handling ELI/EL)? > > I see similar language in RFC8491 but I think we could be clearer in this > I-D for ERLD. > > (4) Section 4 > > What would be the behavior if an IS-IS router receives an ERLD of the node > but no ELC set for the corresponding prefix? That would be an error as per > RFC 8662, we should specify how one handles it within IS-IS. If it is to > just ignore the ERLD, we should explicitly say that. the behavior is specified in the RFC 8662. ISIS is just a messenger, not the consumer of this information. > > (5) Section 4 > > We need to clearly state that this new MSD Type is carried in Node MSD > sub-TLV as described in [RFC8491]. And then I guess we don't really need > figure 2? The format is as per RFC 8491! done. > > Nits: > > (1) Abstract - use term LSP instead of tunnel for consistency > > OLD: > An ingress Label > Switching Router (LSR) cannot insert ELs for packets going into a > given Label Switched Path (LSP) unless an egress LSR has indicated > via signaling that it has the capability to process ELs, referred to > as the Entropy Label Capability (ELC), on that tunnel. > NEW: > An ingress Label > Switching Router (LSR) cannot insert ELs for packets going into a > given Label Switched Path (LSP) unless an egress LSR has indicated > via signaling that it has the capability to process ELs, referred to > as the Entropy Label Capability (ELC), on that LSP. > END > fixed > (2) Expand BGP-LS on first use! fixed. thanks, Peter > > Thanks! > Dhruv > > > > From nobody Wed May 6 04:43:48 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 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LmlldGYub3JnL21haWxtYW4vbGlzdGluZm8vaWV0Zi1hbm5vdW5jZTxvOnA+PC9vOnA+PC9wPg0K PC9kaXY+DQo8L2Rpdj4NCjwvYmxvY2txdW90ZT4NCjwvZGl2Pg0KPHAgY2xhc3M9Ik1zb05vcm1h bCIgc3R5bGU9Im1hcmdpbi1sZWZ0Oi41aW4iPjxvOnA+Jm5ic3A7PC9vOnA+PC9wPg0KPC9kaXY+ DQo8L2Rpdj4NCjwvYm9keT4NCjwvaHRtbD4NCg== --_000_E5D5B9111EA84D12BDDD02ED8D5E0C3Bciscocom_-- From nobody Wed May 6 05:21:43 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 5B2463A09F8; Wed, 6 May 2020 05:21:41 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -9.601 X-Spam-Level: X-Spam-Status: No, score=-9.601 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIMWL_WL_MED=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, SPF_PASS=-0.001, URIBL_BLOCKED=0.001, USER_IN_DEF_DKIM_WL=-7.5] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=cisco.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Pt2rc_3xqyyW; Wed, 6 May 2020 05:21:39 -0700 (PDT) Received: from aer-iport-2.cisco.com (aer-iport-2.cisco.com [173.38.203.52]) (using TLSv1.2 with cipher DHE-RSA-SEED-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id A56883A09F5; Wed, 6 May 2020 05:21:38 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=2012; q=dns/txt; s=iport; t=1588767699; x=1589977299; h=subject:to:cc:references:from:message-id:date: mime-version:in-reply-to:content-transfer-encoding; bh=GRqFxRHqFKm/wrqhAkE6bJHpi9ohQcoXtJJILuT5t8Q=; b=FWkgxky9wdWaKyrovyYAIj3aMXPlb1a8B3wPOBgaW8M5+dum6yezQ4aF 8A0QPlGtOcHBSjC0ogrR6w0bh4f2SsbGfSfQepz6FoaMOIpqIajiqHePk eU07J9YNjsCE/oJrN6QxfR0VBpTB9uIqG3YOOSdzp+E+gG352C4Gzc7Js 4=; X-IronPort-AV: E=Sophos;i="5.73,358,1583193600"; d="scan'208";a="25938746" Received: from aer-iport-nat.cisco.com (HELO aer-core-4.cisco.com) ([173.38.203.22]) by aer-iport-2.cisco.com with ESMTP/TLS/DHE-RSA-SEED-SHA; 06 May 2020 12:21:37 +0000 Received: from [10.60.140.51] (ams-ppsenak-nitro2.cisco.com [10.60.140.51]) by aer-core-4.cisco.com (8.15.2/8.15.2) with ESMTP id 046CLZD8030806; Wed, 6 May 2020 12:21:36 GMT To: Barry Leiba , The IESG Cc: draft-ietf-isis-mpls-elc@ietf.org, lsr-chairs@ietf.org, lsr@ietf.org, Acee Lindem , aretana.ietf@gmail.com References: <158874113658.16071.17054286250715268005@ietfa.amsl.com> From: Peter Psenak Message-ID: <4509238f-9aa6-c9c0-ec67-5ad1401dcb10@cisco.com> Date: Wed, 6 May 2020 14:21:35 +0200 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:60.0) Gecko/20100101 Thunderbird/60.7.0 MIME-Version: 1.0 In-Reply-To: <158874113658.16071.17054286250715268005@ietfa.amsl.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit X-Outbound-SMTP-Client: 10.60.140.51, ams-ppsenak-nitro2.cisco.com X-Outbound-Node: aer-core-4.cisco.com Archived-At: Subject: Re: [Lsr] Barry Leiba's No Objection on draft-ietf-isis-mpls-elc-12: (with COMMENT) X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 06 May 2020 12:21:42 -0000 Hi Barry, thanks for comments, I fixed them all. thanks, Peter On 06/05/2020 06:58, Barry Leiba via Datatracker wrote: > Barry Leiba has entered the following ballot position for > draft-ietf-isis-mpls-elc-12: No Objection > > When responding, please keep the subject line intact and reply to all > email addresses included in the To and CC lines. (Feel free to cut this > introductory paragraph, however.) > > > Please refer to https://www.ietf.org/iesg/statement/discuss-criteria.html > for more information about IESG DISCUSS and COMMENT positions. > > > The document, along with other ballot positions, can be found here: > https://datatracker.ietf.org/doc/draft-ietf-isis-mpls-elc/ > > > > ---------------------------------------------------------------------- > COMMENT: > ---------------------------------------------------------------------- > > Just a few editorial nits: > > — Section 1 — > > In cases where LSPs are used (e.g., SR-MPLS [RFC8660], it would be > > Nit: you need a closing parenthesis instead of the second comma. > > This capability, referred to as Entropy Readable Label > Depth (ERLD) as defined in [RFC8662] may be used by ingress LSRs to > > Nit: this needs a comma after the citation. > > — Section 3 — > > originator. Similarly in a multi-domain network, the identity of the > > Nit: “Similarly” needs a comma after it. > > When a router propagates a prefix between ISIS levels ([RFC5302], it > > Nit: remove the open parenthesis. > > an Autonomous System Boundary Router (ASBR) is outside of the scope > > Nit: the abbreviation “ASBR” is not used elsewhere in the document, so there’s > no reason to include it. > > — Section 4 — > > A new MSD-type [RFC8491], called ERLD-MSD is defined to advertise the > > Nit: 8491 capitalizes the “T” in “MSD-Type”. > Nit: there needs to be a comma after “ERLD-MSD”. > > > > > From nobody Wed May 6 05:27:10 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 8FA443A09FB; Wed, 6 May 2020 05:27:02 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -9.601 X-Spam-Level: X-Spam-Status: No, score=-9.601 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIMWL_WL_MED=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, SPF_PASS=-0.001, URIBL_BLOCKED=0.001, USER_IN_DEF_DKIM_WL=-7.5] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=cisco.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id E4yllR-Xidjm; Wed, 6 May 2020 05:27:01 -0700 (PDT) Received: from aer-iport-1.cisco.com (aer-iport-1.cisco.com [173.38.203.51]) (using TLSv1.2 with cipher DHE-RSA-SEED-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 132463A09F9; Wed, 6 May 2020 05:26:59 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=2233; q=dns/txt; s=iport; t=1588768020; x=1589977620; h=subject:to:cc:references:from:message-id:date: mime-version:in-reply-to:content-transfer-encoding; bh=aBt9f991E3T2We9cOFsRnmUUVJAkz0LH3iy3EniDo4w=; b=QSFdBIj+oyZxJkUpPygqUtaE/gS/Ddhn16Ly4qffEFqalQheQh1TiMfl PlIFVvXr+AXJMvbH3mQPaBQJzRxsv5mJiw9Ds3EEkSSr8zDjear6fYS3q HpjaNasQhdS32ZNGBDArGomRkWWea74GhgNYB8ROci7i4P6ce2F3/q4Xn 8=; X-IronPort-AV: E=Sophos;i="5.73,358,1583193600"; d="scan'208";a="25936989" Received: from aer-iport-nat.cisco.com (HELO aer-core-4.cisco.com) ([173.38.203.22]) by aer-iport-1.cisco.com with ESMTP/TLS/DHE-RSA-SEED-SHA; 06 May 2020 12:26:58 +0000 Received: from [10.60.140.51] (ams-ppsenak-nitro2.cisco.com [10.60.140.51]) by aer-core-4.cisco.com (8.15.2/8.15.2) with ESMTP id 046CQvxp031958; Wed, 6 May 2020 12:26:58 GMT To: Barry Leiba , The IESG Cc: draft-ietf-ospf-mpls-elc@ietf.org, lsr-chairs@ietf.org, lsr@ietf.org, Acee Lindem , aretana.ietf@gmail.com References: <158874196172.28072.16634723092281391873@ietfa.amsl.com> From: Peter Psenak Message-ID: <633f6cc2-bc0c-d2ce-8d40-0c1fadaaf9e8@cisco.com> Date: Wed, 6 May 2020 14:26:57 +0200 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:60.0) Gecko/20100101 Thunderbird/60.7.0 MIME-Version: 1.0 In-Reply-To: <158874196172.28072.16634723092281391873@ietfa.amsl.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit X-Outbound-SMTP-Client: 10.60.140.51, ams-ppsenak-nitro2.cisco.com X-Outbound-Node: aer-core-4.cisco.com Archived-At: Subject: Re: [Lsr] Barry Leiba's No Objection on draft-ietf-ospf-mpls-elc-13: (with COMMENT) X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 06 May 2020 12:27:03 -0000 Hi Barry, thanks for your comments. I have fixed all editorial comments. For the last two comments, Alvaro has already taken care of. thanks, Peter On 06/05/2020 07:12, Barry Leiba via Datatracker wrote: > Barry Leiba has entered the following ballot position for > draft-ietf-ospf-mpls-elc-13: No Objection > > When responding, please keep the subject line intact and reply to all > email addresses included in the To and CC lines. (Feel free to cut this > introductory paragraph, however.) > > > Please refer to https://www.ietf.org/iesg/statement/discuss-criteria.html > for more information about IESG DISCUSS and COMMENT positions. > > > The document, along with other ballot positions, can be found here: > https://datatracker.ietf.org/doc/draft-ietf-ospf-mpls-elc/ > > > > ---------------------------------------------------------------------- > COMMENT: > ---------------------------------------------------------------------- > > — Section 1 — > > In cases where LSPs are used (e.g., SR-MPLS [RFC8660], it would be > > Nit: you need a closing parenthesis instead of the second comma. > > This capability, referred to as Entropy Readable Label > Depth (ERLD) as defined in [RFC8662] may be used by ingress LSRs to > > Nit: this needs a comma after the citation. > > — Section 3 — > > When an OSPF Area Border Router (ABR) distributes information between > > Nit: the abbreviation “ABR” is not used elsewhere in the document, so there’s > no reason to include it. > > — Section 3.1 — > > Prefix TLV includes a one octet Flags field. > > Nit: hyphenate “one-octet” as a compound modifier. > > — Section 4 — > > The ERLD is advertised in a Node MSD sub-TLV [RFC8476] using the > ERLD-MSD type defined in [I-D.ietf-isis-mpls-elc]. > > Just checking: is the IS-IS draft the right reference here in this OSPF > document? > > There does seem to be so much common text between that document and this one > that I really don’t understand why these (the IS-IS and OSPF signaling) were > not put into one document, and this reference really drives that home. > > > > > From nobody Wed May 6 05:39:24 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 0F9953A0A12; Wed, 6 May 2020 05:39:14 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -9.601 X-Spam-Level: X-Spam-Status: No, score=-9.601 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIMWL_WL_MED=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, SPF_PASS=-0.001, URIBL_BLOCKED=0.001, USER_IN_DEF_DKIM_WL=-7.5] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=cisco.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id JINDG31yOqiM; Wed, 6 May 2020 05:39:12 -0700 (PDT) Received: from aer-iport-4.cisco.com (aer-iport-4.cisco.com [173.38.203.54]) (using TLSv1.2 with cipher DHE-RSA-SEED-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id F36183A0A52; Wed, 6 May 2020 05:39:08 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=1446; q=dns/txt; s=iport; t=1588768749; x=1589978349; h=subject:to:cc:references:from:message-id:date: mime-version:in-reply-to:content-transfer-encoding; bh=HhoKjuFE5G+Av9oJDMpSAQ1kq3irWzc3Uk17aSqUZpg=; b=VGfhEHGJSk5juzhuy+jZv9PrSMEcMsy8USv7yxFG7ngcttbbd23LD00T s9qar8yg9xUeJMya3tYju9S71TwuhvpIe0pPFPLJGDQvgwKLqFStDt2Fc E6GGUs3k0K09dXrs4P6gtOFaKzGKD5qJZuClB9b3VQIACKhcsMCjM0OjM s=; X-IronPort-AV: E=Sophos;i="5.73,359,1583193600"; d="scan'208";a="25876693" Received: from aer-iport-nat.cisco.com (HELO aer-core-1.cisco.com) ([173.38.203.22]) by aer-iport-4.cisco.com with ESMTP/TLS/DHE-RSA-SEED-SHA; 06 May 2020 12:39:01 +0000 Received: from [10.60.140.51] (ams-ppsenak-nitro2.cisco.com [10.60.140.51]) by aer-core-1.cisco.com (8.15.2/8.15.2) with ESMTP id 046Cd0ST009504; Wed, 6 May 2020 12:39:00 GMT To: Murray Kucherawy , The IESG Cc: draft-ietf-ospf-mpls-elc@ietf.org, lsr-chairs@ietf.org, lsr@ietf.org, Acee Lindem , aretana.ietf@gmail.com References: <158874432005.11799.17357260664387833460@ietfa.amsl.com> From: Peter Psenak Message-ID: <6bd87198-8776-a80b-72b7-d7f1d66d4e85@cisco.com> Date: Wed, 6 May 2020 14:39:00 +0200 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:60.0) Gecko/20100101 Thunderbird/60.7.0 MIME-Version: 1.0 In-Reply-To: <158874432005.11799.17357260664387833460@ietfa.amsl.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-Outbound-SMTP-Client: 10.60.140.51, ams-ppsenak-nitro2.cisco.com X-Outbound-Node: aer-core-1.cisco.com Archived-At: Subject: Re: [Lsr] Murray Kucherawy's No Objection on draft-ietf-ospf-mpls-elc-13: (with COMMENT) X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 06 May 2020 12:39:19 -0000 Hi Murray, On 06/05/2020 07:52, Murray Kucherawy via Datatracker wrote: > Murray Kucherawy has entered the following ballot position for > draft-ietf-ospf-mpls-elc-13: No Objection > > When responding, please keep the subject line intact and reply to all > email addresses included in the To and CC lines. (Feel free to cut this > introductory paragraph, however.) > > > Please refer to https://www.ietf.org/iesg/statement/discuss-criteria.html > for more information about IESG DISCUSS and COMMENT positions. > > > The document, along with other ballot positions, can be found here: > https://datatracker.ietf.org/doc/draft-ietf-ospf-mpls-elc/ > > > > ---------------------------------------------------------------------- > COMMENT: > ---------------------------------------------------------------------- > > As with the IS-IS document, I assume the presence of six authors, above our > usual limit of five, was approved by your AD. > > I agree with Barry's point that this document and the IS-IS document could > easily have been combined. Even some of the syntactical things he corrected > are present in both documents. > > When would you ever not do what the two SHOULDs in Section 3 say? advertising ELC property with prefix advertisement is optional. We can not mandate it. It would make all routers not advertising this data violating this spec. thanks, Peter > > > > > From nobody Wed May 6 06:21:10 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 8EEE83A0B2E for ; Wed, 6 May 2020 06:21:01 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.084 X-Spam-Level: X-Spam-Status: No, score=-2.084 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_BLOCKED=0.001, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_KAM_HTML_FONT_INVALID=0.01, UNPARSEABLE_RELAY=0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=orange.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id hV99zGH5nebt for ; Wed, 6 May 2020 06:20:57 -0700 (PDT) Received: from relais-inet.orange.com (relais-inet.orange.com [80.12.66.41]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 92EDA3A03F3 for ; Wed, 6 May 2020 06:20:53 -0700 (PDT) Received: from opfedar01.francetelecom.fr (unknown [xx.xx.xx.2]) by opfedar27.francetelecom.fr (ESMTP service) with ESMTP id 49HHKJ1ySzz2xjr; Wed, 6 May 2020 15:20:52 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=orange.com; s=ORANGE001; t=1588771252; bh=CWHLmaGnNsA36Umh6CPjPWbPJVA7eKHnTzUI3uMEu0w=; h=From:To:Subject:Date:Message-ID:Content-Type:MIME-Version; b=JISz3p49euFQXuzRzzLqcgG86kCn5LTgLrB+gDmhiskFOwOe3/qLQafpWZfixw6Nw KAIPc+VbyC+aQrjCoFVKJALWnHH0kUsqd8kWA9GqWTFRF7Dl/+xMknnw2AGC9vjP8O XpJi4ZlahWuPBCD5haUvhA5P0TEuljxMGeashhTUis8L4NQdFzOvpbw00unABbYoI/ 5HvUthNmnwWtIn+enRaT8UfIbWS86prVhT7wVg17mFieHoC4S9XnTN0dILI6eTT3gJ OFPe+bgrpzsF2f/09YA1/LtR2gHtA1d3d4wSrAkB+/8tN3GsWrW150BtX7C2oQGpeI sLoYn9IGXvE6w== Received: from Exchangemail-eme6.itn.ftgroup (unknown [xx.xx.13.57]) by opfedar01.francetelecom.fr (ESMTP service) with ESMTP id 49HHKJ0ncjzBrLQ; Wed, 6 May 2020 15:20:52 +0200 (CEST) From: To: "Les Ginsberg (ginsberg)" CC: "lsr@ietf.org" Thread-Topic: Flooding across a network Thread-Index: AdYi7bsxcCpCOCQDSjylEJ0cQECozgAREGJwAByiJrA= Date: Wed, 6 May 2020 13:20:51 +0000 Message-ID: <6287_1588771252_5EB2B9B4_6287_332_1_53C29892C857584299CBF5D05346208A48E3F698@OPEXCAUBM43.corporate.adroot.infra.ftgroup> References: <24209_1588692477_5EB185FD_24209_35_1_53C29892C857584299CBF5D05346208A48E3D455@OPEXCAUBM43.corporate.adroot.infra.ftgroup> In-Reply-To: Accept-Language: fr-FR, en-US Content-Language: fr-FR X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.114.13.245] Content-Type: multipart/alternative; boundary="_000_53C29892C857584299CBF5D05346208A48E3F698OPEXCAUBM43corp_" MIME-Version: 1.0 Archived-At: Subject: Re: [Lsr] Flooding across a network X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 06 May 2020 13:21:07 -0000 --_000_53C29892C857584299CBF5D05346208A48E3F698OPEXCAUBM43corp_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Les, From: Les Ginsberg (ginsberg) [mailto:ginsberg@cisco.com] Sent: Wednesday, May 6, 2020 1:35 AM To: DECRAENE Bruno TGI/OLN; lsr@ietf.org Subject: RE: Flooding across a network Bruno - Seems like it was not too long ago that we were discussing this in person. = Ahhh...the good old days... [Bruno] Indeed, may be not to the point of concluding. Indeed. First, let's agree that the interesting case does not involve 1 or even a s= mall number of LSPs. For those cases flooding speed does not matter. The interesting cases involve a large number of LSPs (hundreds or thousands= ). And in such cases LFA/microloop avoidance techniques are not applicable. Take the following simple topology: | | ... | | +---+ +---+ | C | | E | +---+ +---+ | | 1000 +---+ +---+ | B |-------------| D | +---+ 1000 +---+ | | | | \ / \ / \ / \ / +---+ | A | +---+ There is a topology northbound of C and E (not shown) and a topology southb= ound of A (not shown). Cost on all links is 10 except B-D and D-E where cost is high. C is a node with 1000 neighbors. When all links are up, shortest path for all northbound destinations is via= C. All nodes in the network support fast flooding except for Node D. Let's say fast flooding is 500 LSPs/second and slow flooding (Node D) is 20= LSPs/seconds. If Node C fails we have 1000 LSPs to flood. All nodes except for D can receive these in 2 seconds (plus internode delay= time). D can receive LSPs in 50 seconds. [Bruno] Thanks for your example. Agreed so far. When A and B and all southbound nodes receive/process the LSP updates they = will start sending traffic to Northbound destinations via D. But for the better part of 50 seconds, Node D has yet to receive all LSP up= dates and still believes that shortest path is via B-C. It will loop traffi= c. [Bruno] May I remind you that we are discussing IS-IS flooding in order to = sync LSDB (LSP database). That is already a big enough subject. It does not= including FIB (updates), nor IP forwarding. Quoting you "when only some nodes in the network support faster flooding th= e behavior of the whole network may not be "better" when faster flooding is= enabled because it prolongs the period of LSDB inconsistency." Taking your own examples, in both cases (all nodes support fast flooding; a= ll nodes but D support fast flooding) the period of LSDB inconsistency is 5= 0 seconds. Hence this example does not illustrate your statement. Hence I'm restating my questions: > > when only some nodes in the network support faster flooding the behavior > of the whole network may not be "better" when faster flooding is enabled > because it prolongs the period of LSDB inconsistency. > > 1) Do you have data on this? > > 2) If not, can you provide an example where increasing the flooding rate = on > one adjacency prolongs the period of LSDB inconsistency across the > network? Had all nodes used slow flooding, it still would have taken 50 seconds to c= onverge, but there would be significantly less looping. There could be a go= od amount of blackholing, but this is preferable to looping. [Bruno] You are using an example where ordering FIB updates across the netw= ork, e.g. as per [1], allows to reduce _FIB_ inconsistency across the path/= network. And you seem to conclude from this that this translates to LSDB up= date ordering. Those are two different things. In this thread, I'd suggest = that we focus on IGP flooding and LSDB sync only. (*) [1] https://tools.ietf.org/html/rfc6976 (*) We can discuss loop free IGP converge in a different thread if you want= . IMO, the use of segment routing/source routing is better than oFIB. But a= t some point, it still relies on fast flooding when multiple LSPs are invol= ved. (and I mean _fast_ not _ordered_) --Bruno One can always come up with examples - based on a specific topology and a s= pecific failure - where things might be better/worse/unchanged in the face = of inconsistent flooding speed support. But I hope this simple example illustrates the pitfalls. Les > -----Original Message----- > From: bruno.decraene@orange.com > Sent: Tuesday, May 05, 2020 8:28 AM > To: Les Ginsberg (ginsberg) ; lsr@ietf.org > Subject: Flooding across a network > > Les, > > > From: Lsr [mailto:lsr-bounces@ietf.org] On Behalf Of Les Ginsberg > (ginsberg) > > Sent: Monday, May 4, 2020 4:39 PM > [...] > > when only some nodes in the network support faster flooding the behavior > of the whole network may not be "better" when faster flooding is enabled > because it prolongs the period of LSDB inconsistency. > > 1) Do you have data on this? > > 2) If not, can you provide an example where increasing the flooding rate = on > one adjacency prolongs the period of LSDB inconsistency across the > network? > > 3) In the meantime, let's try the theoretical analysis on a simple scenar= io > where a single LSP needs to be flooded across the network. > > - Let's call Dij the time needed to flood the LSP from node i to the adja= cent > node j. Clearly Dij>0. > - Let's call k the node originating this LSP at t0=3D0s > > >From t0, the LSDB is inconsistent across the network as all nodes but k = are > missing the LSP and hence only know about the 'old' topology. > > Let's call SPT(k) the SPT rooted on k, using Dij as the metric between > adjacent nodes i and j. Let's call SP(k,i) the shortest path from k to i;= and > D(k,i) the shortest distance between k and i. > > It seems that the time needed: > - for node j to learn about the LSP, and get in sync with k, is D(k,j) > - for all nodes across the network to learn about the LSP, and get in syn= c with > k, is Max[for all j] D(k,j) > > Then how can reducing the flooding delay on one adjacency could prolongs > the period of LSDB inconsistency? > It seems to me that it can only improve/decrease it. Otherwise, this would > mean that decreasing the cost on a link can increase the cost of the shor= test > path. > > Note: I agree that there are other cases, such as multiple LSPs originat= ed by > the same node, and multiple LSPs originated by multiple nodes, but let's = start > with the simple case. > > Thanks, > --Bruno > > > -----Original Message----- > > From: Lsr [mailto:lsr-bounces@ietf.org] On Behalf Of Les Ginsberg > (ginsberg) > > Sent: Monday, May 4, 2020 4:39 PM > > > > Henk - > > > > Thanx for your thoughtful posts. > > I have read your later posts on this thread as well - but decided to re= ply to > this one. > > Top posting for better readability. > > > > There is broad agreement that faster flooding is desirable. > > There are now two proposals as to how to address the issue - neither of > which is proposing to use TCP (or equivalent). > > > > I have commented on why IS-IS flooding requirements are significantly > different than that for which TCP is used. > > I think it is also useful to note that even the simple test case which = Bruno > reported on in last week's interim meeting demonstrated that without any > changes to the protocol at all IS-IS was able to flood an order of magnit= ude > faster than it commonly does today. > > This gives me hope that we are looking at the problem correctly and wil= l not > need "TCP". > > > > Introducing a TCP based solution requires: > > > > a)A major change to the adjacency formation logic > > > > b)Removal of the independence of the IS-IS protocol from the address > families whose reachability advertisements it supports - something which I > think is a great strength of the protocol - particularly in environments = where > multiple address family support is needed > > > > I really don't want to do either of the above. > > > > Your comments regarding PSNP response times are quite correct - and > both of the draft proposals discuss this - though I agree more detail wil= l be > required. > > It is intuitive that if you want to flood faster you also need to ACK f= aster - > and probably even retransmit faster when that is needed. > > The basic relationship between retransmit interval and PSNP interval is > expressed in ISO 10589: > > > > " partialSNPInterval - This is the amount of time between periodic > > action for transmission of Partial Sequence Number PDUs. > > It shall be less than minimumLSPTransmission-Interval." > > > > Of course ISO 10589 recommended values (2 seconds and 5 seconds > respectively) associated with a much slower flooding rate and > implementations I am aware of use values in this order of magnitude. These > numbers need to be reduced if we are to flood faster, but the relationship > between the two needs to remain the same. > > > > It is also true - as you state - that sending ACKs more quickly will re= sult in > additional PDUs which need to be received/processed by IS-IS - and this h= as > some impact. But I think it is reasonable to expect that an implementation > which can support sending and receiving LSPs at a faster rate should also= be > able to send/receive PSNPs at a faster rate. But we still need to be smar= ter > than sending one PSNP/one LSP in cases where we have a burst. > > > > LANs are a more difficult problem than P2P - and thus far draft-ginsber= g-lsr- > isis-flooding-scale has been silent on this - but not because we aren't a= ware > of this - just have focused on the P2P behavior first. > > What the best behavior on a LAN may be is something I am still consider= ing. > Slowing flooding down to the speed at which the slowest IS on the LAN can > support may not be the best strategy - as it also slows down the propagat= ion > rate for systems downstream from the nodes on the LAN which can handle > faster flooding - thereby having an impact on flooding speed throughout t= he > network in a way which may be out of proportion. This is a smaller example > of the larger issue that when only some nodes in the network support fast= er > flooding the behavior of the whole network may not be "better" when faster > flooding is enabled because it prolongs the period of LSDB inconsistency. > More work needs to be done here... > > > > In summary, I don't expect to have to "reinvent TCP" - but I do think y= ou > have provided a useful perspective for us to consider as we progress on t= his > topic, > > > > Thanx. > > > > Les > > > > > > > -----Original Message----- > > > From: Lsr > On Beha= lf Of Henk Smit > > > Sent: Thursday, April 30, 2020 6:58 AM > > > To: lsr@ietf.org > > > Subject: [Lsr] Why only a congestion-avoidance algorithm on the sender > isn't > > > enough > > > > > > > > > Hello all, > > > > > > Two years ago, Gunter Van de Velde and myself published this draft: > > > https://tools.ietf.org/html/draft-hsmit-lsr-isis-flooding-over-tcp-00 > > > That started this discussion about flow/congestion control and ISIS > > > flooding. > > > > > > My thoughts were that once we start implementing new algorithms to > > > optimize ISIS flooding speed, we'll end up with our own version of TC= P. > > > I think most people here have a good general understanding of TCP. > > > But if not, this is a good overview how TCP does it: > > > https://en.wikipedia.org/wiki/TCP_congestion_control > > > > > > > > > What does TCP do: > > > =3D=3D=3D=3D > > > TCP does 2 things: flow control and congestion control. > > > > > > 1) Flow control is: the receiver trying to prevent itself from being > > > overloaded. The receiver indicates, through the receiver-window-size > > > in the TCP acks, how much data it can or wants to receive. > > > 2) Congestion control is: the sender trying to prevent the links betw= een > > > sender and receiver from being overloaded. The sender makes an > educated > > > guess at what speed it can send. > > > > > > > > > The part we seem to be missing: > > > =3D=3D=3D=3D > > > For the sender to make a guess at what speed it can send, it looks at > > > how the transmission is behaving. Are there drops ? What is the RTT ? > > > Do drop-percentage and RTT change ? Do acks come in at the same rate > > > as the sender sends segments ? Are there duplicate acks ? To be able > > > to do this, the sender must know what to expect. How acks behave. > > > > > > If you want an ISIS sender to make a guess at what speed it can send, > > > without changing the protocol, the only thing the sender can do is lo= ok > > > at the PSNPs that come back from the receiver. But the RTT of PSNPs c= an > > > not be predicted. Because a good ISIS implementation does not > > > immediately > > > send a PSNP when it receives a LSP. 1) the receiver should jitter the > > > PSNP, > > > like it should jitter all packets. And 2) the receiver should wait a > > > little > > > to see if it can combine multiple acks into a single PSNP packet. > > > > > > In TCP, if a single segment gets lost, each new segment will cause the > > > receiver to send an ack with the seqnr of the last received byte. This > > > is called "duplicate acks". This triggers the sender to do > > > fast-retransmission. In ISIS, this can't be be done. The information > > > a sender can get from looking at incoming PSNPs is a lot less than wh= at > > > TCP can learn from incoming acks. > > > > > > > > > The problem with sender-side congestion control: > > > =3D=3D=3D=3D > > > In ISIS, all we know is that the default retransmit-interval is 5 > > > seconds. > > > And I think most implementations use that as the default. This means > > > that > > > the receiver of an LSP has one requirement: send a PSNP within 5 > > > seconds. > > > For the rest, implementations are free to send PSNPs however and > > > whenever > > > they want. This means a sender can not really make conclusions about > > > flooding speed, dropped LSPs, capacity of the receiver, etc. > > > There is no ordering when flooding LSPs, or sending PSNPs. This makes > > > a sender-side algorithm for ISIS a lot harder. > > > > > > When you think about it, you realize that a sender should wait the > > > full 5 seconds before it can make any real conclusions about dropped > > > LSPs. > > > If a sender looks at PSNPs to determine its flooding speed, it will > > > probably > > > not be able to react without a delay of a few seconds. A sender might > > > send > > > hunderds or thousands of LSPs in those 5 seconds, which might all or > > > partially be dropped, complicating matters even further. > > > > > > > > > A sender-sider algorithm should specify how to do PSNPs. > > > =3D=3D=3D=3D > > > So imho a sender-side only algorithm can't work just like that in a > > > multi-vendor environment. We must not only specify a congestion- > control > > > algorithm for the sender. We must also specify for the receiver a more > > > specific algorithm how and when to send PSNPs. At least how to do > PSNPs > > > under load. > > > > > > Note that this might result in the receiver sending more (and smaller) > > > PSNPs. > > > More packets might mean more congestion (inside routers). > > > > > > > > > Will receiver-side flow-control work ? > > > =3D=3D=3D=3D > > > I don't know if that's enough. It will certainly help. > > > > > > I think to tackle this problem, we need 3 parts: > > > 1) sender-side congestion-control algorithm > > > 2) more detailed algorithm on receiver when and how to send PSNPs > > > 3) receiver-side flow-control mechanism > > > > > > As discussed at length, I don't know if the ISIS process on the > > > receiving > > > router can actually know if its running out of resources (buffers on > > > interfaces, linecards, etc). That's implementation dependent. A recei= ver > > > can definitely advertise a fixed value. So the sender has an upper bo= und > > > to use when doing congestion-control. Just like TCP has both a > > > flow-control > > > window and a congestion-control window, and a sender uses both. > Maybe > > > the > > > receiver can even advertise a dynamic value. Maybe now, maybe only in > > > the > > > future. An advertised upper limit seems useful to me today. > > > > > > > > > What I didn't like about our own proposal (flooding over TCP): > > > =3D=3D=3D=3D > > > The problem I saw with flooding over TCP concerns multi-point networks > > > (LANs). > > > > > > When flooding over a multi-point network, setting up TCP connections > > > introduces serious challenges. Who are the endpoints of the TCP > > > connections ? > > > Full mesh ? Or do all ISes on a LAN create a TCP-connection to the DI= S ? > > > There is no backup DIS in ISIS (unlike OSPF). Things get messy quickl= y. > > > > > > However, the other two proposals do not solve this problem either. > > > How will a sender-side congestion-avoidence algorithm determine > whether > > > there were drops ? There are no acks (PSNPs) on a LAN. We assume most > > > LSPs > > > that are broadcasted are received by all other ISes on the LAN. There > > > are > > > no acks. Only after the DIS has sent its periodic CSNPs, ISes can send > > > PSNPs to request retransmissions. It seems impossible (or very hard) = to > > > me for all ISes on a LAN to keep track of dropped LSPs and adjust the= ir > > > sending speed accordingly. > > > > > > When flooding on a LAN, the receiver-side algorithm seems best. > Because > > > all ISes can see what the lowest advertised sending-speed is. And make > > > sure they send slow enough to not overload the slowest IS. I'm not su= re > > > this is a good solution, but is seems easier and more realistic than > > > ISIS-flooding-over-TCP or sender-side congestion-avoidance. > > > > > > > > > My conclusion: > > > =3D=3D=3D=3D > > > Sender-side congestion-control won't work without specifying in more > > > detail how and when to send PSNPs. > > > Receiver-side flow-control will certainly help. I dont' know if it's > > > good enough. I don't know if advertising a static value is good enoug= h. > > > But it's a start. > > > > > > I still think we'll end up re-implementing a new (and weaker) TCP. > > > > > > > > > henk. > > > > > > _______________________________________________ > > > Lsr mailing list > > > Lsr@ietf.org > > > https://www.ietf.org/mailman/listinfo/lsr > > > > _______________________________________________ > > Lsr mailing list > > Lsr@ietf.org > > https://www.ietf.org/mailman/listinfo/lsr > > __________________________________________________________ > __________________________________________________________ > _____ > > Ce message et ses pieces jointes peuvent contenir des informations > confidentielles ou privilegiees et ne doivent donc > pas etre diffuses, exploites ou copies sans autorisation. Si vous avez re= cu ce > message par erreur, veuillez le signaler > a l'expediteur et le detruire ainsi que les pieces jointes. Les messages > electroniques etant susceptibles d'alteration, > Orange decline toute responsabilite si ce message a ete altere, deforme ou > falsifie. Merci. > > This message and its attachments may contain confidential or privileged > information that may be protected by law; > they should not be distributed, used or copied without authorisation. > If you have received this email in error, please notify the sender and de= lete > this message and its attachments. > As emails may be altered, Orange is not liable for messages that have been > modified, changed or falsified. > Thank you. ___________________________________________________________________________= ______________________________________________ Ce message et ses pieces jointes peuvent contenir des informations confiden= tielles ou privilegiees et ne doivent donc pas etre diffuses, exploites ou copies sans autorisation. Si vous avez recu= ce message par erreur, veuillez le signaler a l'expediteur et le detruire ainsi que les pieces jointes. Les messages el= ectroniques etant susceptibles d'alteration, Orange decline toute responsabilite si ce message a ete altere, deforme ou = falsifie. Merci. This message and its attachments may contain confidential or privileged inf= ormation that may be protected by law; they should not be distributed, used or copied without authorisation. If you have received this email in error, please notify the sender and dele= te this message and its attachments. As emails may be altered, Orange is not liable for messages that have been = modified, changed or falsified. Thank you. --_000_53C29892C857584299CBF5D05346208A48E3F698OPEXCAUBM43corp_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Les,

 

From: Les Ginsberg (ginsberg) [mailto:ginsberg@cisco.com]
Sent: Wednesday, May 6, 2020 1:35 AM
To: DECRAENE Bruno TGI/OLN; lsr@ietf.org
Subject: RE: Flooding across a network

 

Bruno -

 

Seems like it was not too long ago that = we were discussing this in person.  Ahhh= ...the good old days...

[Bruno] Indeed, may b= e not to the point of concluding. Indeed.

 

First, let's agree that the interesting = case does not involve 1 or even a small number of LSPs. For those cases flo= oding speed does not matter.

The interesting cases involve a large nu= mber of LSPs (hundreds or thousands). And in such cases LFA/microloop avoid= ance techniques are not applicable.

 

Take the following simple topology:=

 

   |  | ... |     &= nbsp;      |

     +---+   &nb= sp;         +---+

     | C |     = ;        | E |

     +---+   &nb= sp;         +---+

       |   &nb= sp;             = ;| 1000

     +---+   &nb= sp;         +---+

     | B |-------------| D |=

     +---+   1000&nbs= p;     +---+

       |   &nb= sp;            = |

       |   &nb= sp;            = |

        \  &nb= sp;            /

         \ &nb= sp;          /

          \&nb= sp;        /

          = ; \      /

          = ;   +---+

          = ;   | A |

          = ;   +---+

 

There is a topology northbound of C and = E (not shown) and a topology southbound of A (not shown).=

Cost on all links is 10 except B-D and D= -E where cost is high.

 

C is a node with 1000 neighbors.

When all links are up, shortest path for= all northbound destinations is via C.

All nodes in the network support fast fl= ooding except for Node D.

Let’s say fast flooding is 500 LSP= s/second and slow flooding (Node D) is 20 LSPs/seconds.

If  Node C fails we have 1000 LSPs = to flood.

All nodes except for D can receive these= in 2 seconds (plus internode delay time).

D can receive LSPs in 50 seconds.

 

[Bruno] Thanks for yo= ur example. Agreed so far.

 

When A and B and all southbound nodes re= ceive/process the LSP updates they will start sending traffic to Northbound= destinations via D.

But for the better part of 50 seconds, N= ode D has yet to receive all LSP updates and still believes that shortest p= ath is via B-C. It will loop traffic.

 

= [Bruno] May I remind you that we are discussing IS-IS flooding in order to sync LS= DB (LSP database). That is already a big enough subject. It does not includ= ing FIB (updates), nor IP forwarding.

 

Quoting you “wh= en only some nodes in the network support faster flooding the behavior of the whole network may not be "better" when faste= r flooding is enabled because it prolongs the period of LSDB inconsistency.= ”

 

Taking your own examp= les, in both cases (all nodes support fast flooding; all nodes but D support fast flooding) the period of LSDB inconsistency is= 50 seconds. Hence this example does not illustrate your statement.

 

Hence I’m resta= ting my questions:

 

> > when only s= ome nodes in the network support faster flooding the behavior

> of the whole net= work may not be "better" when faster flooding is enabled

> because it prolo= ngs the period of LSDB inconsistency.

> =

> 1) Do you have d= ata on this?

>

> 2) If not, can y= ou provide an example where increasing the flooding rate on

> one adjacency pr= olongs the period of LSDB inconsistency across the

> network?

 

 

Had all nodes used slow flooding, it sti= ll would have taken 50 seconds to converge, but there would be significantl= y less looping. There could be a good amount of blackholing, but this is preferable to looping.

[Bruno] You are using= an example where ordering FIB updates across the network, e.g. as per [1], allows to reduce _FIB_ inconsistency acro= ss the path/network. And you seem to conclude from this that this translate= s to LSDB update ordering. Those are two different things. In this thread, = I’d suggest that we focus on IGP flooding and LSDB sync only. (*)

[1] https://tools.ietf.org/html= /rfc6976

(*) We can discuss lo= op free IGP converge in a different thread if you want. IMO, the use of segment routing/source routing is better than oFIB. But at some point, it still relies on fast flooding when multi= ple LSPs are involved. (and I mean _fast_ not _ordered_)

 

--Bruno

 

One can always come up with examples = 211; based on a specific topology and a specific failure - where things mig= ht be better/worse/unchanged in the face of inconsistent flooding speed support.

But I hope this simple example illustrat= es the pitfalls.

 

    Les=

 

> -----Original Message-----

> From: bruno.decraene@orange.com <= ;bruno.decraene@orange.com>

> Sent: Tuesday, May 05, 2020 8:28 AM=

> To: Les Ginsberg (ginsberg) <gin= sberg@cisco.com>; lsr@ietf.org

> Subject: Flooding across a network<= o:p>

>

> Les,

>

> > From: Lsr [mailto:lsr-bounces@ietf.org] On Behalf Of Les Ginsberg

> (ginsberg)

> > Sent: Monday, May 4, 2020 4:39= PM

> [...]

> > when only some nodes in the ne= twork support faster flooding the behavior

> of the whole network may not be &qu= ot;better" when faster flooding is enabled

> because it prolongs the period of L= SDB inconsistency.

>

> 1) Do you have data on this?

>

> 2) If not, can you provide an examp= le where increasing the flooding rate on

> one adjacency prolongs the period o= f LSDB inconsistency across the

> network?

>

> 3) In the meantime, let's try the t= heoretical analysis on a simple scenario

> where a single LSP needs to be floo= ded across the network.

>

> - Let's call Dij the time needed to= flood the LSP from node i to the adjacent

> node j. Clearly Dij>0.

> - Let's call k the node originating= this LSP at t0=3D0s

>

> >From t0, the LSDB is inconsiste= nt across the network as all nodes but k are

> missing the LSP and hence only know= about the 'old' topology.

>

> Let's call  SPT(k) the SPT roo= ted on k, using Dij as the metric between

> adjacent nodes i and j. Let's call = SP(k,i) the shortest path from k to i; and

> D(k,i) the shortest distance betwee= n k and i.

>

> It seems that the time needed:=

> - for node j to learn about the LSP= , and get in sync with k, is D(k,j)

> - for all nodes across the network = to learn about the LSP, and get in sync with

> k, is Max[for all j] D(k,j)

>

> Then how can reducing the flooding = delay on one adjacency could prolongs

> the period of LSDB inconsistency?

> It seems to me that it can only imp= rove/decrease it. Otherwise, this would

> mean that decreasing the cost on a = link can increase the cost of the shortest

> path.

>

> Note: I agree that there are other = cases, such as  multiple LSPs originated by

> the same node, and multiple LSPs or= iginated by multiple nodes, but let's start

> with the simple case.

>

> Thanks,

> --Bruno

>

> > -----Original Message-----

> > From: Lsr [mailto:lsr-bounces@ietf.org] On Behalf Of Les Ginsberg

> (ginsberg)

> > Sent: Monday, May 4, 2020 4:39= PM

> >

> > Henk -

> >

> > Thanx for your thoughtful post= s.

> > I have read your later posts o= n this thread as well - but decided to reply to

> this one.

> > Top posting for better readabi= lity.

> >

> > There is broad agreement that = faster flooding is desirable.

> > There are now two proposals as= to how to address the issue - neither of

> which is proposing to use TCP (or e= quivalent).

> >

> > I have commented on why IS-IS = flooding requirements are significantly

> different than that for which TCP i= s used.

> > I think it is also useful to n= ote that even the simple test case which Bruno

> reported on in last week's interim = meeting demonstrated that without any

> changes to the protocol at all IS-I= S was able to flood an order of magnitude

> faster than it commonly does today.=

> > This gives me hope that we are= looking at the problem correctly and will not

> need "TCP".

> >

> > Introducing a TCP based soluti= on requires:

> >

> > a)A major change to the adjace= ncy formation logic

> >

> > b)Removal of the independence = of the IS-IS protocol from the address

> families whose reachability adverti= sements it supports - something which I

> think is a great strength of the pr= otocol - particularly in environments where

> multiple address family support is = needed

> >

> > I really don't want to do eith= er of the above.

> >

> > Your comments regarding PSNP r= esponse times are quite correct - and

> both of the draft proposals discuss= this - though I agree more detail will be

> required.

> > It is intuitive that if you wa= nt to flood faster you also need to ACK faster -

> and probably even retransmit faster= when that is needed.

> > The basic relationship between= retransmit interval and PSNP interval is

> expressed in ISO 10589:<= /span>

> >

> > " partialSNPInterval - Th= is is the amount of time between periodic

>       = ;  > action for transmission of Partial Sequence Number PDUs.<= o:p>

>       = ;  > It shall be less than minimumLSPTransmission-Interval.&qu= ot;

> >

> > Of course ISO 10589 recommende= d values (2 seconds and 5 seconds

> respectively) associated with a muc= h slower flooding rate and

> implementations I am aware of use v= alues in this order of magnitude. These

> numbers need to be reduced if we ar= e to flood faster, but the relationship

> between the two needs to remain the= same.

> >

> > It is also true - as you state= - that sending ACKs more quickly will result in

> additional PDUs which need to be re= ceived/processed by IS-IS - and this has

> some impact. But I think it is reas= onable to expect that an implementation

> which can support sending and recei= ving LSPs at a faster rate should also be

> able to send/receive PSNPs at a fas= ter rate. But we still need to be smarter

> than sending one PSNP/one LSP in ca= ses where we have a burst.

> >

> > LANs are a more difficult prob= lem than P2P - and thus far draft-ginsberg-lsr-

> isis-flooding-scale has been silent= on this - but not because we aren't aware

> of this - just have focused on the = P2P behavior first.

> > What the best behavior on a LA= N may be is something I am still considering.

> Slowing flooding down to the speed = at which the slowest IS on the LAN can

> support may not be the best strateg= y - as it also slows down the propagation

> rate for systems downstream from th= e nodes on the LAN which can handle

> faster flooding - thereby having an= impact on flooding speed throughout the

> network in a way which may be out o= f proportion. This is a smaller example

> of the larger issue that when only = some nodes in the network support faster

> flooding the behavior of the whole = network may not be "better" when faster

> flooding is enabled because it prol= ongs the period of LSDB inconsistency.

> More work needs to be done here...<= o:p>

> >

> > In summary, I don't expect to = have to "reinvent TCP" - but I do think you

> have provided a useful perspective = for us to consider as we progress on this

> topic,

> >

> > Thanx.

> >

>     > Les

> >

> >

> > > -----Original Message----= -

> > > From: Lsr <lsr-bounces@ietf.org> On Behalf Of Henk Smit

> > > Sent: Thursday, April 30,= 2020 6:58 AM

> > > To: lsr@ietf.org

> > > Subject: [Lsr] Why only a= congestion-avoidance algorithm on the sender

> isn't

> > > enough<= /p>

> > >

> > >

> > > Hello all,

> > >

> > > Two years ago, Gunter Van= de Velde and myself published this draft:

> > > https://tools.ietf.org/html/draft-hsmit-lsr-isis-flooding-over-tcp-00=

> > > That started this discuss= ion about flow/congestion control and ISIS

> > > flooding.

> > >

> > > My thoughts were that onc= e we start implementing new algorithms to

> > > optimize ISIS flooding sp= eed, we'll end up with our own version of TCP.

> > > I think most people here = have a good general understanding of TCP.

> > > But if not, this is a goo= d overview how TCP does it:

> > > https://en.= wikipedia.org/wiki/TCP_congestion_control

> > >

> > >

> > > What does TCP do:

> > > =3D=3D=3D=3D

> > > TCP does 2 things: flow c= ontrol and congestion control.

> > >

> > > 1) Flow control is: the r= eceiver trying to prevent itself from being

> > > overloaded. The receiver = indicates, through the receiver-window-size

> > > in the TCP acks, how much= data it can or wants to receive.

> > > 2) Congestion control is:= the sender trying to prevent the links between

> > > sender and receiver from = being overloaded. The sender makes an

> educated

> > > guess at what speed it ca= n send.

> > >

> > >

> > > The part we seem to be mi= ssing:

> > > =3D=3D=3D=3D

> > > For the sender to make a = guess at what speed it can send, it looks at

> > > how the transmission is b= ehaving. Are there drops ? What is the RTT ?

> > > Do drop-percentage and RT= T change ? Do acks come in at the same rate

> > > as the sender sends segme= nts ? Are there duplicate acks ? To be able

> > > to do this, the sender mu= st know what to expect. How acks behave.

> > >

> > > If you want an ISIS sende= r to make a guess at what speed it can send,

> > > without changing the prot= ocol, the only thing the sender can do is look

> > > at the PSNPs that come ba= ck from the receiver. But the RTT of PSNPs can

> > > not be predicted. Because= a good ISIS implementation does not

> > > immediately

> > > send a PSNP when it recei= ves a LSP. 1) the receiver should jitter the

> > > PSNP,

> > > like it should jitter all= packets. And 2) the receiver should wait a

> > > little<= /p>

> > > to see if it can combine = multiple acks into a single PSNP packet.

> > >

> > > In TCP, if a single segme= nt gets lost, each new segment will cause the

> > > receiver to send an ack w= ith the seqnr of the last received byte. This

> > > is called "duplicate= acks". This triggers the sender to do

> > > fast-retransmission. In I= SIS, this can't be be done. The information

> > > a sender can get from loo= king at incoming PSNPs is a lot less than what

> > > TCP can learn from incomi= ng acks.

> > >

> > >

> > > The problem with sender-s= ide congestion control:

> > > =3D=3D=3D=3D

> > > In ISIS, all we know is t= hat the default retransmit-interval is 5

> > > seconds.

> > > And I think most implemen= tations use that as the default. This means

> > > that

> > > the receiver of an LSP ha= s one requirement: send a PSNP within 5

> > > seconds.

> > > For the rest, implementat= ions are free to send PSNPs however and

> > > whenever

> > > they want. This means a s= ender can not really make conclusions about

> > > flooding speed, dropped L= SPs, capacity of the receiver, etc.

> > > There is no ordering when= flooding LSPs, or sending PSNPs. This makes

> > > a sender-side algorithm f= or ISIS a lot harder.

> > >

> > > When you think about it, = you realize that a sender should wait the

> > > full 5 seconds before it = can make any real conclusions about dropped

> > > LSPs.

> > > If a sender looks at PSNP= s to determine its flooding speed, it will

> > > probably

> > > not be able to react with= out a delay of a few seconds. A sender might

> > > send

> > > hunderds or thousands of = LSPs in those 5 seconds, which might all or

> > > partially be dropped, com= plicating matters even further.

> > >

> > >

> > > A sender-sider algorithm = should specify how to do PSNPs.

> > > =3D=3D=3D=3D

> > > So imho a sender-side onl= y algorithm can't work just like that in a

> > > multi-vendor environment.= We must not only specify a congestion-

> control

> > > algorithm for the sender.= We must also specify for the receiver a more

> > > specific algorithm how an= d when to send PSNPs. At least how to do

> PSNPs

> > > under load.

> > >

> > > Note that this might resu= lt in the receiver sending more (and smaller)

> > > PSNPs.<= /p>

> > > More packets might mean m= ore congestion (inside routers).

> > >

> > >

> > > Will receiver-side flow-c= ontrol work ?

> > > =3D=3D=3D=3D

> > > I don't know if that's en= ough. It will certainly help.

> > >

> > > I think to tackle this pr= oblem, we need 3 parts:

> > > 1) sender-side congestion= -control algorithm

> > > 2) more detailed algorith= m on receiver when and how to send PSNPs

> > > 3) receiver-side flow-con= trol mechanism

> > >

> > > As discussed at length, I= don't know if the ISIS process on the

> > > receiving

> > > router can actually know = if its running out of resources (buffers on

> > > interfaces, linecards, et= c). That's implementation dependent. A receiver

> > > can definitely advertise = a fixed value. So the sender has an upper bound

> > > to use when doing congest= ion-control. Just like TCP has both a

> > > flow-control

> > > window and a congestion-c= ontrol window, and a sender uses both.

> Maybe

> > > the

> > > receiver can even adverti= se a dynamic value. Maybe now, maybe only in

> > > the

> > > future. An advertised upp= er limit seems useful to me today.

> > >

> > >

> > > What I didn't like about = our own proposal (flooding over TCP):

> > > =3D=3D=3D=3D

> > > The problem I saw with fl= ooding over TCP concerns multi-point networks

> > > (LANs).=

> > >

> > > When flooding over a mult= i-point network, setting up TCP connections

> > > introduces serious challe= nges. Who are the endpoints of the TCP

> > > connections ?<= /span>

> > > Full mesh ? Or do all ISe= s on a LAN create a TCP-connection to the DIS ?

> > > There is no backup DIS in= ISIS (unlike OSPF). Things get messy quickly.

> > >

> > > However, the other two pr= oposals do not solve this problem either.

> > > How will a sender-side co= ngestion-avoidence algorithm determine

> whether

> > > there were drops ? There = are no acks (PSNPs) on a LAN. We assume most

> > > LSPs

> > > that are broadcasted are = received by all other ISes on the LAN. There

> > > are

> > > no acks. Only after the D= IS has sent its periodic CSNPs, ISes can send

> > > PSNPs to request retransm= issions. It seems impossible (or very hard) to

> > > me for all ISes on a LAN = to keep track of dropped LSPs and adjust their

> > > sending speed accordingly= .

> > >

> > > When flooding on a LAN, t= he receiver-side algorithm seems best.

> Because

> > > all ISes can see what the= lowest advertised sending-speed is. And make

> > > sure they send slow enoug= h to not overload the slowest IS. I'm not sure

> > > this is a good solution, = but is seems easier and more realistic than

> > > ISIS-flooding-over-TCP or= sender-side congestion-avoidance.

> > >

> > >

> > > My conclusion:=

> > > =3D=3D=3D=3D

> > > Sender-side congestion-co= ntrol won't work without specifying in more

> > > detail how and when to se= nd PSNPs.

> > > Receiver-side flow-contro= l will certainly help. I dont' know if it's

> > > good enough. I don't know= if advertising a static value is good enough.

> > > But it's a start.

> > >

> > > I still think we'll end u= p re-implementing a new (and weaker) TCP.

> > >

> > >

> > > henk.

> > >

> > > _________________________= ______________________

> > > Lsr mailing list

> > > Lsr@ietf.org

> > > https://www.ietf.org/m= ailman/listinfo/lsr

> >

> > ______________________________= _________________

> > Lsr mailing list

> > Lsr@ietf.org

> > https://www.ietf.org/m= ailman/listinfo/lsr

>

> ___________________________________= _______________________

> ___________________________________= _______________________

> _____

>

> Ce message et ses pieces jointes pe= uvent contenir des informations

> confidentielles ou privilegiees et = ne doivent donc

> pas etre diffuses, exploites ou cop= ies sans autorisation. Si vous avez recu ce

> message par erreur, veuillez le sig= naler

> a l'expediteur et le detruire ainsi= que les pieces jointes. Les messages

> electroniques etant susceptibles d'= alteration,

> Orange decline toute responsabilite= si ce message a ete altere, deforme ou

> falsifie. Merci.<= /p>

>

> This message and its attachments ma= y contain confidential or privileged

> information that may be protected b= y law;

> they should not be distributed, use= d or copied without authorisation.

> If you have received this email in = error, please notify the sender and delete

> this message and its attachments.

> As emails may be altered, Orange is= not liable for messages that have been

> modified, changed or falsified.

> Thank you.

 

______________________________________________________________________=
___________________________________________________

Ce message et ses pieces jointes peuvent contenir des informations confiden=
tielles ou privilegiees et ne doivent donc
pas etre diffuses, exploites ou copies sans autorisation. Si vous avez recu=
 ce message par erreur, veuillez le signaler
a l'expediteur et le detruire ainsi que les pieces jointes. Les messages el=
ectroniques etant susceptibles d'alteration,
Orange decline toute responsabilite si ce message a ete altere, deforme ou =
falsifie. Merci.

This message and its attachments may contain confidential or privileged inf=
ormation that may be protected by law;
they should not be distributed, used or copied without authorisation.
If you have received this email in error, please notify the sender and dele=
te this message and its attachments.
As emails may be altered, Orange is not liable for messages that have been =
modified, changed or falsified.
Thank you.
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Wed, 6 May 2020 14:14:22 +0000 From: "Les Ginsberg (ginsberg)" To: "bruno.decraene@orange.com" CC: "lsr@ietf.org" Thread-Topic: Flooding across a network Thread-Index: AdYi7bsxcCpCOCQDSjylEJ0cQECozgAREGJwAByiJrAAAl2gYA== Date: Wed, 6 May 2020 14:14:22 +0000 Message-ID: References: <24209_1588692477_5EB185FD_24209_35_1_53C29892C857584299CBF5D05346208A48E3D455@OPEXCAUBM43.corporate.adroot.infra.ftgroup> <6287_1588771252_5EB2B9B4_6287_332_1_53C29892C857584299CBF5D05346208A48E3F698@OPEXCAUBM43.corporate.adroot.infra.ftgroup> In-Reply-To: <6287_1588771252_5EB2B9B4_6287_332_1_53C29892C857584299CBF5D05346208A48E3F698@OPEXCAUBM43.corporate.adroot.infra.ftgroup> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: orange.com; dkim=none (message not signed) header.d=none;orange.com; dmarc=none action=none header.from=cisco.com; x-originating-ip: [2602:306:36ca:6640:297d:1f43:941a:5bfe] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: f251a912-bef3-4aec-49a8-08d7f1c7c67d x-ms-traffictypediagnostic: MW3PR11MB4761: x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:10000; 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charset="us-ascii" Content-Transfer-Encoding: quoted-printable Bruno - I am somewhat at a loss to understand your comments. The example is straightforward and does not need to consider FIB update tim= e nor the ordering of prefix updates on different nodes. Consider the state of Node B and Node D at various time points from the tri= gger event. T+ 2 seconds: ----------------- B has received all LSP Updates. It triggers an SPF and for all Northbound d= estinations previously reachable via C it installs paths via D. Let's assume it take 5 seconds to update the forwarding plane. D has received 40 of the 1000 LSP updates. It triggers an SPF and finds tha= t all Northbound destinations are reachable via B-C. It makes no changes to= the forwarding plane. T+7 seconds ----------------- B has completed FIB updates. Traffic to all Northbound destinations is bein= g forwarded via D. D has now received 140 of the 1000 LSP updates. Entries in its forwarding p= lane for Northbound destinations still point to B. We have a loop. T + 30 seconds -------------------- D has now received 600 of the 1000 LSP updates. Still no changes to its for= warding plane. Traffic to Northbound destinations is still looping. T+ 50 seconds ------------------- D has finally received all 1000 LSP updates. It triggers (another) SPF and calculates paths to Northbound destinations v= ia E. It begins to update its forwarding plane. Let's assume this will take 5 seconds. T + 55 seconds -------------------- D has completed forwarding plane updates - no more looping. That is all I am trying to illustrate. If you want to start arguing that node protecting LFAs + microloop avoidanc= e could help (NOTE I explicitly took those out of the example for simplici= ty) - it is easy enough to change the example to include multiple node fail= ures or a node failure plus some northbound link failures on other nodes. The point here is to look at the impact of long-lived LSDB inconsistency wh= ich results when some nodes support flooding an order of magnitude faster f= looding than other nodes - which is what you asked me to clarify. Les From: bruno.decraene@orange.com Sent: Wednesday, May 06, 2020 6:21 AM To: Les Ginsberg (ginsberg) Cc: lsr@ietf.org Subject: RE: Flooding across a network Les, From: Les Ginsberg (ginsberg) [mailto:ginsberg@cisco.com] Sent: Wednesday, May 6, 2020 1:35 AM To: DECRAENE Bruno TGI/OLN; lsr@ietf.org Subject: RE: Flooding across a network Bruno - Seems like it was not too long ago that we were discussing this in person. = Ahhh...the good old days... [Bruno] Indeed, may be not to the point of concluding. Indeed. First, let's agree that the interesting case does not involve 1 or even a s= mall number of LSPs. For those cases flooding speed does not matter. The interesting cases involve a large number of LSPs (hundreds or thousands= ). And in such cases LFA/microloop avoidance techniques are not applicable. Take the following simple topology: | | ... | | +---+ +---+ | C | | E | +---+ +---+ | | 1000 +---+ +---+ | B |-------------| D | +---+ 1000 +---+ | | | | \ / \ / \ / \ / +---+ | A | +---+ There is a topology northbound of C and E (not shown) and a topology southb= ound of A (not shown). Cost on all links is 10 except B-D and D-E where cost is high. C is a node with 1000 neighbors. When all links are up, shortest path for all northbound destinations is via= C. All nodes in the network support fast flooding except for Node D. Let's say fast flooding is 500 LSPs/second and slow flooding (Node D) is 20= LSPs/seconds. If Node C fails we have 1000 LSPs to flood. All nodes except for D can receive these in 2 seconds (plus internode delay= time). D can receive LSPs in 50 seconds. [Bruno] Thanks for your example. Agreed so far. When A and B and all southbound nodes receive/process the LSP updates they = will start sending traffic to Northbound destinations via D. But for the better part of 50 seconds, Node D has yet to receive all LSP up= dates and still believes that shortest path is via B-C. It will loop traffi= c. [Bruno] May I remind you that we are discussing IS-IS flooding in order to = sync LSDB (LSP database). That is already a big enough subject. It does not= including FIB (updates), nor IP forwarding. Quoting you "when only some nodes in the network support faster flooding th= e behavior of the whole network may not be "better" when faster flooding is= enabled because it prolongs the period of LSDB inconsistency." Taking your own examples, in both cases (all nodes support fast flooding; a= ll nodes but D support fast flooding) the period of LSDB inconsistency is 5= 0 seconds. Hence this example does not illustrate your statement. Hence I'm restating my questions: > > when only some nodes in the network support faster flooding the behavio= r > of the whole network may not be "better" when faster flooding is enabled > because it prolongs the period of LSDB inconsistency. > > 1) Do you have data on this? > > 2) If not, can you provide an example where increasing the flooding rate = on > one adjacency prolongs the period of LSDB inconsistency across the > network? Had all nodes used slow flooding, it still would have taken 50 seconds to c= onverge, but there would be significantly less looping. There could be a go= od amount of blackholing, but this is preferable to looping. [Bruno] You are using an example where ordering FIB updates across the netw= ork, e.g. as per [1], allows to reduce _FIB_ inconsistency across the path/= network. And you seem to conclude from this that this translates to LSDB up= date ordering. Those are two different things. In this thread, I'd suggest = that we focus on IGP flooding and LSDB sync only. (*) [1] https://tools.ietf.org/html/rfc6976 (*) We can discuss loop free IGP converge in a different thread if you want= . IMO, the use of segment routing/source routing is better than oFIB. But a= t some point, it still relies on fast flooding when multiple LSPs are invol= ved. (and I mean _fast_ not _ordered_) --Bruno One can always come up with examples - based on a specific topology and a s= pecific failure - where things might be better/worse/unchanged in the face = of inconsistent flooding speed support. But I hope this simple example illustrates the pitfalls. Les > -----Original Message----- > From: bruno.decraene@orange.com > > Sent: Tuesday, May 05, 2020 8:28 AM > To: Les Ginsberg (ginsberg) >; lsr@ietf.org > Subject: Flooding across a network > > Les, > > > From: Lsr [mailto:lsr-bounces@ietf.org] On Behalf Of Les Ginsberg > (ginsberg) > > Sent: Monday, May 4, 2020 4:39 PM > [...] > > when only some nodes in the network support faster flooding the behavio= r > of the whole network may not be "better" when faster flooding is enabled > because it prolongs the period of LSDB inconsistency. > > 1) Do you have data on this? > > 2) If not, can you provide an example where increasing the flooding rate = on > one adjacency prolongs the period of LSDB inconsistency across the > network? > > 3) In the meantime, let's try the theoretical analysis on a simple scenar= io > where a single LSP needs to be flooded across the network. > > - Let's call Dij the time needed to flood the LSP from node i to the adja= cent > node j. Clearly Dij>0. > - Let's call k the node originating this LSP at t0=3D0s > > >From t0, the LSDB is inconsistent across the network as all nodes but k = are > missing the LSP and hence only know about the 'old' topology. > > Let's call SPT(k) the SPT rooted on k, using Dij as the metric between > adjacent nodes i and j. Let's call SP(k,i) the shortest path from k to i;= and > D(k,i) the shortest distance between k and i. > > It seems that the time needed: > - for node j to learn about the LSP, and get in sync with k, is D(k,j) > - for all nodes across the network to learn about the LSP, and get in syn= c with > k, is Max[for all j] D(k,j) > > Then how can reducing the flooding delay on one adjacency could prolongs > the period of LSDB inconsistency? > It seems to me that it can only improve/decrease it. Otherwise, this woul= d > mean that decreasing the cost on a link can increase the cost of the shor= test > path. > > Note: I agree that there are other cases, such as multiple LSPs originat= ed by > the same node, and multiple LSPs originated by multiple nodes, but let's = start > with the simple case. > > Thanks, > --Bruno > > > -----Original Message----- > > From: Lsr [mailto:lsr-bounces@ietf.org] On Behalf Of Les Ginsberg > (ginsberg) > > Sent: Monday, May 4, 2020 4:39 PM > > > > Henk - > > > > Thanx for your thoughtful posts. > > I have read your later posts on this thread as well - but decided to re= ply to > this one. > > Top posting for better readability. > > > > There is broad agreement that faster flooding is desirable. > > There are now two proposals as to how to address the issue - neither of > which is proposing to use TCP (or equivalent). > > > > I have commented on why IS-IS flooding requirements are significantly > different than that for which TCP is used. > > I think it is also useful to note that even the simple test case which = Bruno > reported on in last week's interim meeting demonstrated that without any > changes to the protocol at all IS-IS was able to flood an order of magnit= ude > faster than it commonly does today. > > This gives me hope that we are looking at the problem correctly and wil= l not > need "TCP". > > > > Introducing a TCP based solution requires: > > > > a)A major change to the adjacency formation logic > > > > b)Removal of the independence of the IS-IS protocol from the address > families whose reachability advertisements it supports - something which = I > think is a great strength of the protocol - particularly in environments = where > multiple address family support is needed > > > > I really don't want to do either of the above. > > > > Your comments regarding PSNP response times are quite correct - and > both of the draft proposals discuss this - though I agree more detail wil= l be > required. > > It is intuitive that if you want to flood faster you also need to ACK f= aster - > and probably even retransmit faster when that is needed. > > The basic relationship between retransmit interval and PSNP interval is > expressed in ISO 10589: > > > > " partialSNPInterval - This is the amount of time between periodic > > action for transmission of Partial Sequence Number PDUs. > > It shall be less than minimumLSPTransmission-Interval." > > > > Of course ISO 10589 recommended values (2 seconds and 5 seconds > respectively) associated with a much slower flooding rate and > implementations I am aware of use values in this order of magnitude. Thes= e > numbers need to be reduced if we are to flood faster, but the relationshi= p > between the two needs to remain the same. > > > > It is also true - as you state - that sending ACKs more quickly will re= sult in > additional PDUs which need to be received/processed by IS-IS - and this h= as > some impact. But I think it is reasonable to expect that an implementatio= n > which can support sending and receiving LSPs at a faster rate should also= be > able to send/receive PSNPs at a faster rate. But we still need to be smar= ter > than sending one PSNP/one LSP in cases where we have a burst. > > > > LANs are a more difficult problem than P2P - and thus far draft-ginsber= g-lsr- > isis-flooding-scale has been silent on this - but not because we aren't a= ware > of this - just have focused on the P2P behavior first. > > What the best behavior on a LAN may be is something I am still consider= ing. > Slowing flooding down to the speed at which the slowest IS on the LAN can > support may not be the best strategy - as it also slows down the propagat= ion > rate for systems downstream from the nodes on the LAN which can handle > faster flooding - thereby having an impact on flooding speed throughout t= he > network in a way which may be out of proportion. This is a smaller exampl= e > of the larger issue that when only some nodes in the network support fast= er > flooding the behavior of the whole network may not be "better" when faste= r > flooding is enabled because it prolongs the period of LSDB inconsistency. > More work needs to be done here... > > > > In summary, I don't expect to have to "reinvent TCP" - but I do think y= ou > have provided a useful perspective for us to consider as we progress on t= his > topic, > > > > Thanx. > > > > Les > > > > > > > -----Original Message----- > > > From: Lsr > On Beha= lf Of Henk Smit > > > Sent: Thursday, April 30, 2020 6:58 AM > > > To: lsr@ietf.org > > > Subject: [Lsr] Why only a congestion-avoidance algorithm on the sende= r > isn't > > > enough > > > > > > > > > Hello all, > > > > > > Two years ago, Gunter Van de Velde and myself published this draft: > > > https://tools.ietf.org/html/draft-hsmit-lsr-isis-flooding-over-tcp-00 > > > That started this discussion about flow/congestion control and ISIS > > > flooding. > > > > > > My thoughts were that once we start implementing new algorithms to > > > optimize ISIS flooding speed, we'll end up with our own version of TC= P. > > > I think most people here have a good general understanding of TCP. > > > But if not, this is a good overview how TCP does it: > > > https://en.wikipedia.org/wiki/TCP_congestion_control > > > > > > > > > What does TCP do: > > > =3D=3D=3D=3D > > > TCP does 2 things: flow control and congestion control. > > > > > > 1) Flow control is: the receiver trying to prevent itself from being > > > overloaded. The receiver indicates, through the receiver-window-size > > > in the TCP acks, how much data it can or wants to receive. > > > 2) Congestion control is: the sender trying to prevent the links betw= een > > > sender and receiver from being overloaded. The sender makes an > educated > > > guess at what speed it can send. > > > > > > > > > The part we seem to be missing: > > > =3D=3D=3D=3D > > > For the sender to make a guess at what speed it can send, it looks at > > > how the transmission is behaving. Are there drops ? What is the RTT ? > > > Do drop-percentage and RTT change ? Do acks come in at the same rate > > > as the sender sends segments ? Are there duplicate acks ? To be able > > > to do this, the sender must know what to expect. How acks behave. > > > > > > If you want an ISIS sender to make a guess at what speed it can send, > > > without changing the protocol, the only thing the sender can do is lo= ok > > > at the PSNPs that come back from the receiver. But the RTT of PSNPs c= an > > > not be predicted. Because a good ISIS implementation does not > > > immediately > > > send a PSNP when it receives a LSP. 1) the receiver should jitter the > > > PSNP, > > > like it should jitter all packets. And 2) the receiver should wait a > > > little > > > to see if it can combine multiple acks into a single PSNP packet. > > > > > > In TCP, if a single segment gets lost, each new segment will cause th= e > > > receiver to send an ack with the seqnr of the last received byte. Thi= s > > > is called "duplicate acks". This triggers the sender to do > > > fast-retransmission. In ISIS, this can't be be done. The information > > > a sender can get from looking at incoming PSNPs is a lot less than wh= at > > > TCP can learn from incoming acks. > > > > > > > > > The problem with sender-side congestion control: > > > =3D=3D=3D=3D > > > In ISIS, all we know is that the default retransmit-interval is 5 > > > seconds. > > > And I think most implementations use that as the default. This means > > > that > > > the receiver of an LSP has one requirement: send a PSNP within 5 > > > seconds. > > > For the rest, implementations are free to send PSNPs however and > > > whenever > > > they want. This means a sender can not really make conclusions about > > > flooding speed, dropped LSPs, capacity of the receiver, etc. > > > There is no ordering when flooding LSPs, or sending PSNPs. This makes > > > a sender-side algorithm for ISIS a lot harder. > > > > > > When you think about it, you realize that a sender should wait the > > > full 5 seconds before it can make any real conclusions about dropped > > > LSPs. > > > If a sender looks at PSNPs to determine its flooding speed, it will > > > probably > > > not be able to react without a delay of a few seconds. A sender might > > > send > > > hunderds or thousands of LSPs in those 5 seconds, which might all or > > > partially be dropped, complicating matters even further. > > > > > > > > > A sender-sider algorithm should specify how to do PSNPs. > > > =3D=3D=3D=3D > > > So imho a sender-side only algorithm can't work just like that in a > > > multi-vendor environment. We must not only specify a congestion- > control > > > algorithm for the sender. We must also specify for the receiver a mor= e > > > specific algorithm how and when to send PSNPs. At least how to do > PSNPs > > > under load. > > > > > > Note that this might result in the receiver sending more (and smaller= ) > > > PSNPs. > > > More packets might mean more congestion (inside routers). > > > > > > > > > Will receiver-side flow-control work ? > > > =3D=3D=3D=3D > > > I don't know if that's enough. It will certainly help. > > > > > > I think to tackle this problem, we need 3 parts: > > > 1) sender-side congestion-control algorithm > > > 2) more detailed algorithm on receiver when and how to send PSNPs > > > 3) receiver-side flow-control mechanism > > > > > > As discussed at length, I don't know if the ISIS process on the > > > receiving > > > router can actually know if its running out of resources (buffers on > > > interfaces, linecards, etc). That's implementation dependent. A recei= ver > > > can definitely advertise a fixed value. So the sender has an upper bo= und > > > to use when doing congestion-control. Just like TCP has both a > > > flow-control > > > window and a congestion-control window, and a sender uses both. > Maybe > > > the > > > receiver can even advertise a dynamic value. Maybe now, maybe only in > > > the > > > future. An advertised upper limit seems useful to me today. > > > > > > > > > What I didn't like about our own proposal (flooding over TCP): > > > =3D=3D=3D=3D > > > The problem I saw with flooding over TCP concerns multi-point network= s > > > (LANs). > > > > > > When flooding over a multi-point network, setting up TCP connections > > > introduces serious challenges. Who are the endpoints of the TCP > > > connections ? > > > Full mesh ? Or do all ISes on a LAN create a TCP-connection to the DI= S ? > > > There is no backup DIS in ISIS (unlike OSPF). Things get messy quickl= y. > > > > > > However, the other two proposals do not solve this problem either. > > > How will a sender-side congestion-avoidence algorithm determine > whether > > > there were drops ? There are no acks (PSNPs) on a LAN. We assume most > > > LSPs > > > that are broadcasted are received by all other ISes on the LAN. There > > > are > > > no acks. Only after the DIS has sent its periodic CSNPs, ISes can sen= d > > > PSNPs to request retransmissions. It seems impossible (or very hard) = to > > > me for all ISes on a LAN to keep track of dropped LSPs and adjust the= ir > > > sending speed accordingly. > > > > > > When flooding on a LAN, the receiver-side algorithm seems best. > Because > > > all ISes can see what the lowest advertised sending-speed is. And mak= e > > > sure they send slow enough to not overload the slowest IS. I'm not su= re > > > this is a good solution, but is seems easier and more realistic than > > > ISIS-flooding-over-TCP or sender-side congestion-avoidance. > > > > > > > > > My conclusion: > > > =3D=3D=3D=3D > > > Sender-side congestion-control won't work without specifying in more > > > detail how and when to send PSNPs. > > > Receiver-side flow-control will certainly help. I dont' know if it's > > > good enough. I don't know if advertising a static value is good enoug= h. > > > But it's a start. > > > > > > I still think we'll end up re-implementing a new (and weaker) TCP. > > > > > > > > > henk. > > > > > > _______________________________________________ > > > Lsr mailing list > > > Lsr@ietf.org > > > https://www.ietf.org/mailman/listinfo/lsr > > > > _______________________________________________ > > Lsr mailing list > > Lsr@ietf.org > > https://www.ietf.org/mailman/listinfo/lsr > > __________________________________________________________ > __________________________________________________________ > _____ > > Ce message et ses pieces jointes peuvent contenir des informations > confidentielles ou privilegiees et ne doivent donc > pas etre diffuses, exploites ou copies sans autorisation. Si vous avez re= cu ce > message par erreur, veuillez le signaler > a l'expediteur et le detruire ainsi que les pieces jointes. Les messages > electroniques etant susceptibles d'alteration, > Orange decline toute responsabilite si ce message a ete altere, deforme o= u > falsifie. Merci. > > This message and its attachments may contain confidential or privileged > information that may be protected by law; > they should not be distributed, used or copied without authorisation. > If you have received this email in error, please notify the sender and de= lete > this message and its attachments. > As emails may be altered, Orange is not liable for messages that have bee= n > modified, changed or falsified. > Thank you. ___________________________________________________________________________= ______________________________________________ Ce message et ses pieces jointes peuvent contenir des informations confiden= tielles ou privilegiees et ne doivent donc pas etre diffuses, exploites ou copies sans autorisation. Si vous avez recu= ce message par erreur, veuillez le signaler a l'expediteur et le detruire ainsi que les pieces jointes. Les messages el= ectroniques etant susceptibles d'alteration, Orange decline toute responsabilite si ce message a ete altere, deforme ou = falsifie. Merci. This message and its attachments may contain confidential or privileged inf= ormation that may be protected by law; they should not be distributed, used or copied without authorisation. If you have received this email in error, please notify the sender and dele= te this message and its attachments. As emails may be altered, Orange is not liable for messages that have been = modified, changed or falsified. Thank you. --_000_MW3PR11MB46199CC33B10BC9D3D622D2AC1A40MW3PR11MB4619namp_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Bruno –

 

I am somewhat at a loss to understand your comments.=

The example is straightforward and does not need to = consider FIB update time nor the ordering of prefix updates on different no= des.

 

Consider the state of Node B and Node D at various t= ime points from the trigger event.

 

T+ 2 seconds:

-----------------

B has received all LSP Updates. It triggers an SPF a= nd for all Northbound destinations previously reachable via C it installs p= aths via D.

Let’s assume it take 5 seconds to update the f= orwarding plane.

 

D has received 40 of the 1000 LSP updates. It trigge= rs an SPF and finds that all Northbound destinations are reachable via B-C.= It makes no changes to the forwarding plane.

 

T+7 seconds

-----------------

B has completed FIB updates. Traffic to all Northbou= nd destinations is being forwarded via D.

 

D has now received 140 of the 1000 LSP updates. Entr= ies in its forwarding plane for Northbound destinations still point to B.

 

We have a loop.

 

T + 30 seconds

--------------------

D has now received 600 of the 1000 LSP updates. Stil= l no changes to its forwarding plane.

Traffic to Northbound destinations is still looping.=

 

T+ 50 seconds

-------------------

D has finally received all 1000 LSP updates.

It triggers (another) SPF and calculates paths to No= rthbound destinations via E. It begins to update its forwarding plane.=

Let’s assume this will take 5 seconds.

 

T + 55 seconds

--------------------

D has completed forwarding plane updates – no = more looping.

 

That is all I am trying to illustrate.

 

If you want to start arguing that node protecting LF= As + microloop avoidance could help (NOTE I explicitly  took those= out of the example for simplicity) – it is easy enough to change the= example to include multiple node failures or a node failure plus some northbound link failures on other nodes.

The point here is to look at the impact of long-live= d LSDB inconsistency which results when some nodes support flooding an orde= r of magnitude faster flooding than other nodes – which is what you a= sked me to clarify.

 

   Les

 

 

 

From: bruno.decraene@orange.com <bruno.dec= raene@orange.com>
Sent: Wednesday, May 06, 2020 6:21 AM
To: Les Ginsberg (ginsberg) <ginsberg@cisco.com>
Cc: lsr@ietf.org
Subject: RE: Flooding across a network

 

Les,<= /o:p>

 = ;

From: Les Ginsberg (ginsberg) [mailto:ginsberg@cisco.com]
Sent: Wednesday, May 6, 2020 1:35 AM
To: DECRAENE Bruno TGI/OLN; lsr@ietf= .org
Subject: RE: Flooding across a network

=  

Bruno -

 

Seems like it was no= t too long ago that we were discussing this in person.  Ahhh...the goo= d old days...

[Bruno] Indeed, may= be not to the point of concluding. Indeed.

 

First, let's agree t= hat the interesting case does not involve 1 or even a small number of LSPs.= For those cases flooding speed does not matter.

The interesting case= s involve a large number of LSPs (hundreds or thousands). And in such cases= LFA/microloop avoidance techniques are not applicable.

 

Take the following s= imple topology:

 

   |  | = ... |            |

    = ; +---+          =    +---+

    = ; | C |           &n= bsp; | E |

    = ; +---+          =    +---+

    = ;   |          =        | 1000

    = ; +---+          =    +---+

    = ; | B |-------------| D |

    = ; +---+   1000      +---+= ;

    = ;   |          =        |

    = ;   |          =        |

    = ;    \         =       /

    = ;     \        =     /

    = ;      \       =   /

    = ;       \      /

    = ;         +---+<= /span>

    = ;         | A |

    = ;         +---+<= /span>

 

There is a topology = northbound of C and E (not shown) and a topology southbound of A (not shown= ).

Cost on all links is= 10 except B-D and D-E where cost is high.

 

C is a node with 100= 0 neighbors.

When all links are u= p, shortest path for all northbound destinations is via C.

All nodes in the net= work support fast flooding except for Node D.

Let’s say fast= flooding is 500 LSPs/second and slow flooding (Node D) is 20 LSPs/seconds.=

If  Node C fail= s we have 1000 LSPs to flood.

All nodes except for= D can receive these in 2 seconds (plus internode delay time).

D can receive LSPs i= n 50 seconds.

 

[Bruno] Thanks for = your example. Agreed so far.

 

When A and B and all= southbound nodes receive/process the LSP updates they will start sending t= raffic to Northbound destinations via D.

But for the better p= art of 50 seconds, Node D has yet to receive all LSP updates and still beli= eves that shortest path is via B-C. It will loop traffic.

 

[Bruno] May I remin= d you that we are discussing IS-IS flooding in order to sync LSDB (LSP data= base). That is already a big enough subject. It does not including FIB (upd= ates), nor IP forwarding.

 

Quoting you “= when only some nodes in the network support faster flooding the behavior of= the whole network may not be "better" when faster flooding is en= abled because it prolongs the period of LSDB inconsistency.”

 

Taking your own exa= mples, in both cases (all nodes support fast flooding; all nodes but D supp= ort fast flooding) the period of LSDB inconsistency is 50 seconds. Hence th= is example does not illustrate your statement.

 

Hence I’m res= tating my questions:

 

> > when only= some nodes in the network support faster flooding the behavior<= /span>

> of the whole n= etwork may not be "better" when faster flooding is enabled

> because it pro= longs the period of LSDB inconsistency.

> 

> 1) Do you have= data on this?

>

> 2) If not, can= you provide an example where increasing the flooding rate on

> one adjacency = prolongs the period of LSDB inconsistency across the

> network?<= /o:p>

 

 

Had all nodes used s= low flooding, it still would have taken 50 seconds to converge, but there w= ould be significantly less looping. There could be a good amount of blackho= ling, but this is preferable to looping.

[Bruno] You are usi= ng an example where ordering FIB updates across the network, e.g. as per [1= ], allows to reduce _FIB_ inconsistency across the path/network. And= you seem to conclude from this that this translates to LSDB update ordering. Those are two different things. I= n this thread, I’d suggest that we focus on IGP flooding and LSDB syn= c only. (*)

[1] https://tools.ietf.org/html/rfc6976

(*) We can discuss = loop free IGP converge in a different thread if you want. IMO, the use of s= egment routing/source routing is better than oFIB. But at some point, it st= ill relies on fast flooding when multiple LSPs are involved. (and I mean _fast_ not _ordered_)

 

--Bruno<= /span>

 

One can always come = up with examples – based on a specific topology and a specific failur= e - where things might be better/worse/unchanged in the face of inconsisten= t flooding speed support.

But I hope this simp= le example illustrates the pitfalls.

 

    L= es

 

> -----Original M= essage-----

> From: bruno.decraene@orange.com <bruno.decraene@orange.com>

> Sent: Tuesday, = May 05, 2020 8:28 AM

> To: Les Ginsber= g (ginsberg) <ginsberg@cisco.com>; lsr@ietf.org

> Subject: Floodi= ng across a network

>

> Les,=

>

> > From: Lsr = [mailto:lsr-bounces@ietf.org] On Behalf Of Le= s Ginsberg

> (ginsberg)=

> > Sent: Mond= ay, May 4, 2020 4:39 PM

> [...]

> > when only = some nodes in the network support faster flooding the behavior

> of the whole ne= twork may not be "better" when faster flooding is enabled

> because it prol= ongs the period of LSDB inconsistency.

>

> 1) Do you have = data on this?

>

> 2) If not, can = you provide an example where increasing the flooding rate on

> one adjacency p= rolongs the period of LSDB inconsistency across the

> network?

>

> 3) In the meant= ime, let's try the theoretical analysis on a simple scenario

> where a single = LSP needs to be flooded across the network.

>

> - Let's call Di= j the time needed to flood the LSP from node i to the adjacent

> node j. Clearly= Dij>0.

> - Let's call k = the node originating this LSP at t0=3D0s

>

> >From t0, th= e LSDB is inconsistent across the network as all nodes but k are=

> missing the LSP= and hence only know about the 'old' topology.

>

> Let's call = ; SPT(k) the SPT rooted on k, using Dij as the metric between

> adjacent nodes = i and j. Let's call SP(k,i) the shortest path from k to i; and

> D(k,i) the shor= test distance between k and i.

>

> It seems that t= he time needed:

> - for node j to= learn about the LSP, and get in sync with k, is D(k,j)

> - for all nodes= across the network to learn about the LSP, and get in sync with=

> k, is Max[for a= ll j] D(k,j)

>

> Then how can re= ducing the flooding delay on one adjacency could prolongs

> the period of L= SDB inconsistency?

> It seems to me = that it can only improve/decrease it. Otherwise, this would

> mean that decre= asing the cost on a link can increase the cost of the shortest

> path.

>

> Note: I agree t= hat there are other cases, such as  multiple LSPs originated by

> the same node, = and multiple LSPs originated by multiple nodes, but let's start<= /p>

> with the simple= case.

>

> Thanks,

> --Bruno

>

> > -----Origi= nal Message-----

> > From: Lsr = [mailto:lsr-bounces@ietf.org] On Behalf Of Le= s Ginsberg

> (ginsberg)=

> > Sent: Mond= ay, May 4, 2020 4:39 PM

> >=

> > Henk -

> >=

> > Thanx for = your thoughtful posts.

> > I have rea= d your later posts on this thread as well - but decided to reply to

> this one.<= /o:p>

> > Top postin= g for better readability.

> >=

> > There is b= road agreement that faster flooding is desirable.

> > There are = now two proposals as to how to address the issue - neither of

> which is propos= ing to use TCP (or equivalent).

> >=

> > I have com= mented on why IS-IS flooding requirements are significantly

> different than = that for which TCP is used.

> > I think it= is also useful to note that even the simple test case which Bruno

> reported on in = last week's interim meeting demonstrated that without any

> changes to the = protocol at all IS-IS was able to flood an order of magnitude

> faster than it = commonly does today.

> > This gives= me hope that we are looking at the problem correctly and will not

> need "TCP&= quot;.

> >=

> > Introducin= g a TCP based solution requires:

> >=

> > a)A major = change to the adjacency formation logic

> >=

> > b)Removal = of the independence of the IS-IS protocol from the address

> families whose = reachability advertisements it supports - something which I

> think is a grea= t strength of the protocol - particularly in environments where<= /p>

> multiple addres= s family support is needed

> >=

> > I really d= on't want to do either of the above.

> >=

> > Your comme= nts regarding PSNP response times are quite correct - and

> both of the dra= ft proposals discuss this - though I agree more detail will be

> required.<= /o:p>

> > It is intu= itive that if you want to flood faster you also need to ACK faster -

> and probably ev= en retransmit faster when that is needed.

> > The basic = relationship between retransmit interval and PSNP interval is

> expressed in IS= O 10589:

> >=

> > " par= tialSNPInterval - This is the amount of time between periodic

>   &nb= sp;     > action for transmission of Partial Se= quence Number PDUs.

>   &nb= sp;     > It shall be less than minimumLSPTrans= mission-Interval."

> >=

> > Of course = ISO 10589 recommended values (2 seconds and 5 seconds

> respectively) a= ssociated with a much slower flooding rate and

> implementations= I am aware of use values in this order of magnitude. These

> numbers need to= be reduced if we are to flood faster, but the relationship

> between the two= needs to remain the same.

> >=

> > It is also= true - as you state - that sending ACKs more quickly will result in

> additional PDUs= which need to be received/processed by IS-IS - and this has

> some impact. Bu= t I think it is reasonable to expect that an implementation

> which can suppo= rt sending and receiving LSPs at a faster rate should also be

> able to send/re= ceive PSNPs at a faster rate. But we still need to be smarter

> than sending on= e PSNP/one LSP in cases where we have a burst.

> >=

> > LANs are a= more difficult problem than P2P - and thus far draft-ginsberg-lsr-

> isis-flooding-s= cale has been silent on this - but not because we aren't aware

> of this - just = have focused on the P2P behavior first.

> > What the b= est behavior on a LAN may be is something I am still considering.

> Slowing floodin= g down to the speed at which the slowest IS on the LAN can

> support may not= be the best strategy - as it also slows down the propagation

> rate for system= s downstream from the nodes on the LAN which can handle

> faster flooding= - thereby having an impact on flooding speed throughout the

> network in a wa= y which may be out of proportion. This is a smaller example

> of the larger i= ssue that when only some nodes in the network support faster

> flooding the be= havior of the whole network may not be "better" when faster<= /o:p>

> flooding is ena= bled because it prolongs the period of LSDB inconsistency.

> More work needs= to be done here...

> >=

> > In summary= , I don't expect to have to "reinvent TCP" - but I do think you

> have provided a= useful perspective for us to consider as we progress on this

> topic,

> >=

> > Thanx.

> >=

>   &nb= sp; > Les

> >=

> >=

> > > -----= Original Message-----

> > > From:= Lsr <lsr-bounces@ietf.org> On Behalf O= f Henk Smit

> > > Sent:= Thursday, April 30, 2020 6:58 AM

> > > To: <= a href=3D"mailto:lsr@ietf.org"> lsr@ietf.org

> > > Subje= ct: [Lsr] Why only a congestion-avoidance algorithm on the sender

> isn't

> > > enoug= h

> > ><= /o:p>

> > ><= /o:p>

> > > Hello= all,

> > ><= /o:p>

> > > Two y= ears ago, Gunter Van de Velde and myself published this draft:

> > > https://tools.ietf.or= g/html/draft-hsmit-lsr-isis-flooding-over-tcp-00

> > > That = started this discussion about flow/congestion control and ISIS

> > > flood= ing.

> > ><= /o:p>

> > > My th= oughts were that once we start implementing new algorithms to

> > > optim= ize ISIS flooding speed, we'll end up with our own version of TCP.

> > > I thi= nk most people here have a good general understanding of TCP.

> > > But i= f not, this is a good overview how TCP does it:

> > > https://en.wikipedia.= org/wiki/TCP_congestion_control

> > ><= /o:p>

> > ><= /o:p>

> > > What = does TCP do:

> > > =3D= =3D=3D=3D

> > > TCP d= oes 2 things: flow control and congestion control.

> > ><= /o:p>

> > > 1) Fl= ow control is: the receiver trying to prevent itself from being<= /p>

> > > overl= oaded. The receiver indicates, through the receiver-window-size<= /p>

> > > in th= e TCP acks, how much data it can or wants to receive.

> > > 2) Co= ngestion control is: the sender trying to prevent the links between

> > > sende= r and receiver from being overloaded. The sender makes an

> educated

> > > guess= at what speed it can send.

> > ><= /o:p>

> > ><= /o:p>

> > > The p= art we seem to be missing:

> > > =3D= =3D=3D=3D

> > > For t= he sender to make a guess at what speed it can send, it looks at=

> > > how t= he transmission is behaving. Are there drops ? What is the RTT ?=

> > > Do dr= op-percentage and RTT change ? Do acks come in at the same rate<= /p>

> > > as th= e sender sends segments ? Are there duplicate acks ? To be able<= /p>

> > > to do= this, the sender must know what to expect. How acks behave.

> > ><= /o:p>

> > > If yo= u want an ISIS sender to make a guess at what speed it can send,=

> > > witho= ut changing the protocol, the only thing the sender can do is look

> > > at th= e PSNPs that come back from the receiver. But the RTT of PSNPs can

> > > not b= e predicted. Because a good ISIS implementation does not

> > > immed= iately

> > > send = a PSNP when it receives a LSP. 1) the receiver should jitter the=

> > > PSNP,=

> > > like = it should jitter all packets. And 2) the receiver should wait a<= /p>

> > > littl= e

> > > to se= e if it can combine multiple acks into a single PSNP packet.

> > ><= /o:p>

> > > In TC= P, if a single segment gets lost, each new segment will cause the

> > > recei= ver to send an ack with the seqnr of the last received byte. This

> > > is ca= lled "duplicate acks". This triggers the sender to do<= /p>

> > > fast-= retransmission. In ISIS, this can't be be done. The information<= /p>

> > > a sen= der can get from looking at incoming PSNPs is a lot less than what

> > > TCP c= an learn from incoming acks.

> > ><= /o:p>

> > ><= /o:p>

> > > The p= roblem with sender-side congestion control:

> > > =3D= =3D=3D=3D

> > > In IS= IS, all we know is that the default retransmit-interval is 5

> > > secon= ds.

> > > And I= think most implementations use that as the default. This means<= /p>

> > > that<= o:p>

> > > the r= eceiver of an LSP has one requirement: send a PSNP within 5

> > > secon= ds.

> > > For t= he rest, implementations are free to send PSNPs however and

> > > whene= ver

> > > they = want. This means a sender can not really make conclusions about<= /p>

> > > flood= ing speed, dropped LSPs, capacity of the receiver, etc.

> > > There= is no ordering when flooding LSPs, or sending PSNPs. This makes=

> > > a sen= der-side algorithm for ISIS a lot harder.

> > ><= /o:p>

> > > When = you think about it, you realize that a sender should wait the

> > > full = 5 seconds before it can make any real conclusions about dropped<= /p>

> > > LSPs.=

> > > If a = sender looks at PSNPs to determine its flooding speed, it will

> > > proba= bly

> > > not b= e able to react without a delay of a few seconds. A sender might=

> > > send<= o:p>

> > > hunde= rds or thousands of LSPs in those 5 seconds, which might all or<= /p>

> > > parti= ally be dropped, complicating matters even further.

> > ><= /o:p>

> > ><= /o:p>

> > > A sen= der-sider algorithm should specify how to do PSNPs.

> > > =3D= =3D=3D=3D

> > > So im= ho a sender-side only algorithm can't work just like that in a

> > > multi= -vendor environment. We must not only specify a congestion-

> control

> > > algor= ithm for the sender. We must also specify for the receiver a more

> > > speci= fic algorithm how and when to send PSNPs. At least how to do

> PSNPs

> > > under= load.

> > ><= /o:p>

> > > Note = that this might result in the receiver sending more (and smaller)

> > > PSNPs= .

> > > More = packets might mean more congestion (inside routers).

> > ><= /o:p>

> > ><= /o:p>

> > > Will = receiver-side flow-control work ?

> > > =3D= =3D=3D=3D

> > > I don= 't know if that's enough. It will certainly help.

> > ><= /o:p>

> > > I thi= nk to tackle this problem, we need 3 parts:

> > > 1) se= nder-side congestion-control algorithm

> > > 2) mo= re detailed algorithm on receiver when and how to send PSNPs

> > > 3) re= ceiver-side flow-control mechanism

> > ><= /o:p>

> > > As di= scussed at length, I don't know if the ISIS process on the

> > > recei= ving

> > > route= r can actually know if its running out of resources (buffers on<= /p>

> > > inter= faces, linecards, etc). That's implementation dependent. A receiver

> > > can d= efinitely advertise a fixed value. So the sender has an upper bound

> > > to us= e when doing congestion-control. Just like TCP has both a

> > > flow-= control

> > > windo= w and a congestion-control window, and a sender uses both.

> Maybe

> > > the

> > > recei= ver can even advertise a dynamic value. Maybe now, maybe only in=

> > > the

> > > futur= e. An advertised upper limit seems useful to me today.

> > ><= /o:p>

> > ><= /o:p>

> > > What = I didn't like about our own proposal (flooding over TCP):

> > > =3D= =3D=3D=3D

> > > The p= roblem I saw with flooding over TCP concerns multi-point networks

> > > (LANs= ).

> > ><= /o:p>

> > > When = flooding over a multi-point network, setting up TCP connections<= /p>

> > > intro= duces serious challenges. Who are the endpoints of the TCP

> > > conne= ctions ?

> > > Full = mesh ? Or do all ISes on a LAN create a TCP-connection to the DIS ?

> > > There= is no backup DIS in ISIS (unlike OSPF). Things get messy quickly.

> > ><= /o:p>

> > > Howev= er, the other two proposals do not solve this problem either.

> > > How w= ill a sender-side congestion-avoidence algorithm determine

> whether

> > > there= were drops ? There are no acks (PSNPs) on a LAN. We assume most=

> > > LSPs<= o:p>

> > > that = are broadcasted are received by all other ISes on the LAN. There=

> > > are

> > > no ac= ks. Only after the DIS has sent its periodic CSNPs, ISes can send

> > > PSNPs= to request retransmissions. It seems impossible (or very hard) to

> > > me fo= r all ISes on a LAN to keep track of dropped LSPs and adjust their

> > > sendi= ng speed accordingly.

> > ><= /o:p>

> > > When = flooding on a LAN, the receiver-side algorithm seems best.

> Because

> > > all I= Ses can see what the lowest advertised sending-speed is. And make

> > > sure = they send slow enough to not overload the slowest IS. I'm not sure

> > > this = is a good solution, but is seems easier and more realistic than<= /p>

> > > ISIS-= flooding-over-TCP or sender-side congestion-avoidance.

> > ><= /o:p>

> > ><= /o:p>

> > > My co= nclusion:

> > > =3D= =3D=3D=3D

> > > Sende= r-side congestion-control won't work without specifying in more<= /p>

> > > detai= l how and when to send PSNPs.

> > > Recei= ver-side flow-control will certainly help. I dont' know if it's<= /p>

> > > good = enough. I don't know if advertising a static value is good enough.

> > > But i= t's a start.

> > ><= /o:p>

> > > I sti= ll think we'll end up re-implementing a new (and weaker) TCP.

> > ><= /o:p>

> > ><= /o:p>

> > > henk.=

> > ><= /o:p>

> > > _____= __________________________________________

> > > Lsr m= ailing list

> > > Lsr@ietf.org

> > > https://www.ietf.org/= mailman/listinfo/lsr

> >=

> > __________= _____________________________________

> > Lsr mailin= g list

> > Lsr@ietf.org

> > https://www.ietf.org/= mailman/listinfo/lsr

>

> _______________= ___________________________________________

> _______________= ___________________________________________

> _____

>

> Ce message et s= es pieces jointes peuvent contenir des informations

> confidentielles= ou privilegiees et ne doivent donc

> pas etre diffus= es, exploites ou copies sans autorisation. Si vous avez recu ce<= /p>

> message par err= eur, veuillez le signaler

> a l'expediteur = et le detruire ainsi que les pieces jointes. Les messages

> electroniques e= tant susceptibles d'alteration,

> Orange decline = toute responsabilite si ce message a ete altere, deforme ou

> falsifie. Merci= .

>

> This message an= d its attachments may contain confidential or privileged

> information tha= t may be protected by law;

> they should not= be distributed, used or copied without authorisation.

> If you have rec= eived this email in error, please notify the sender and delete

> this message an= d its attachments.

> As emails may b= e altered, Orange is not liable for messages that have been

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> Thank you.=

  

____________________________________________________=
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/o:p>
 
Ce message et ses pieces jointes peuvent contenir de=
s informations confidentielles ou privilegiees et ne doivent donc
pas etre diffuses, exploites ou copies sans autorisa=
tion. Si vous avez recu ce message par erreur, veuillez le signaler
a l'expediteur et le detruire ainsi que les pieces j=
ointes. Les messages electroniques etant susceptibles d'alteration,
Orange decline toute responsabilite si ce message a =
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This message and its attachments may contain confide=
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--_000_MW3PR11MB46199CC33B10BC9D3D622D2AC1A40MW3PR11MB4619namp_-- From nobody Wed May 6 07:28:13 2020 Return-Path: X-Original-To: lsr@ietf.org Delivered-To: lsr@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id 022863A0AC1; Wed, 6 May 2020 07:25:30 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit From: Elwyn Davies via Datatracker To: Cc: draft-ietf-ospf-mpls-elc.all@ietf.org, last-call@ietf.org, lsr@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 6.129.0 Auto-Submitted: auto-generated Precedence: bulk Message-ID: <158877512992.25308.14489968716385236242@ietfa.amsl.com> Reply-To: Elwyn Davies Date: Wed, 06 May 2020 07:25:29 -0700 Archived-At: Subject: [Lsr] Genart last call review of draft-ietf-ospf-mpls-elc-13 X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 06 May 2020 14:25:35 -0000 Reviewer: Elwyn Davies Review result: Ready with Nits I am the assigned Gen-ART reviewer for this draft. The General Area Review Team (Gen-ART) reviews all IETF documents being processed by the IESG for the IETF Chair. Please treat these comments just like any other last call comments. For more information, please see the FAQ at . Document: draft-ietf-ospf-mpls-elc-13 Reviewer: Elwyn Davies Review Date: 2020-05-06 IETF LC End Date: 2020-05-05 IESG Telechat date: 2020-05-21 Summary: Ready with nits. Aside: I have to say that the convolutions and cross-referencing of doing the OSPF and IS-IS extensions plus BGP-LS added to the cross-linking with MPLS is leading to mind-blowing complexity. Sooner or later something is going to blow up here! Major issues: None Minor issues: None Nits/editorial comments: Abstract and title :  The application to BGP-LS (s5) is not mentioned in the abstract or the title.  Also the first use of BGP-LS needs to be expanded. Abstract: s/tunnel/LSP/ s1: Suggest s/SR-MPLS/Segment Routing with the MPLS Data Plane/ s1: Query:  As a non-expert in this area, I was wondering if the signalling capability is or will be implemented in IS-IS?  A brief comment on the status wrt IS-IS would be helpful.  [It turns out that you already reference the document that implements this later in this draft.] s1, last sentence: s/it's/it is/ s3: It would be a good idea to expand 'prefix' to 'address prefix advertisement' on its first occurrence here.  Thereafter 'prefix' is fine by me. s3, para 3: Why would a router not advertise the ELC with all prefixes?  Can you say why this ought not to be a MUST. s4, para 3: In that case, what does the absence signify?  Should we care? s4, para 4: This needs a correction and a reference to where the Link MSD Sub-TLV is defined.  As a matter of interest, is there any reason why this should be sent in an OSPF context?  If not why not just prohibit sending it? If it is received should it provoke an error rather than being ignored? OLD: When the ERLD MSD-Type is received in the OSPFv2 or OSPFv3 Link MSD Sub-TLV, it MUST be ignored. NEW: When the ERLD-MSD type is received in the OSPFv2 or OSPFv3 Link MSD Sub-TLV [RFC8476], it MUST be ignored. ENDS s5:  This section needs to be rewritten to be 'future proof' rather than referring to the temporary allocations.  A note about the temporary allocations can be added with a RFC Editor note requesting its removal on final publication. From nobody Wed May 6 07:33:37 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id AA53B3A09C1 for ; Wed, 6 May 2020 07:33:34 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.085 X-Spam-Level: X-Spam-Status: No, score=-2.085 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, HTML_MESSAGE=0.001, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_KAM_HTML_FONT_INVALID=0.01, UNPARSEABLE_RELAY=0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=orange.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id S9SRBF_PbcmC for ; Wed, 6 May 2020 07:33:30 -0700 (PDT) Received: from relais-inet.orange.com (relais-inet.orange.com [80.12.66.41]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 086F93A0AAF for ; Wed, 6 May 2020 07:33:24 -0700 (PDT) Received: from opfedar03.francetelecom.fr (unknown [xx.xx.xx.5]) by opfedar22.francetelecom.fr (ESMTP service) with ESMTP id 49HJwy51kVz2xlf; Wed, 6 May 2020 16:33:22 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=orange.com; s=ORANGE001; t=1588775602; bh=GOTU3jHfTMQxRWT1iv565C33VdaladfjdfwMjZF//Wg=; h=From:To:Subject:Date:Message-ID:Content-Type:MIME-Version; b=jSJvr69K7xujxis7RY5/0NlWCm7NYh2tXjbHdhhHXi0/Q6x8MLv1ZX/ILs78qguQL Q+7uTWnTvuD0nX2Xp2aDjBTNwnozcrE+Q+Xnu2BXjRIO8DbACO33KIJe1Llj58nCa2 7t9e840ikCtdV2YCiiVDuRGJN/Jt1gO997JFsTEIQzcl1vJC2M9vLDBnoU+kynE+2l pIrWiWBU4taHSShwLfqydjYcEMRbPWdUdRAv5XLNJQPQzg0tL1W6lhzE/FRS+eT8ql O1pNx2tla+Xbs8QMqfqw063+40LEX3p9odr1f3jRQLY9mW2c5VIx8ggTu5rikXhF8t 1TVkYjsjfy6ag== Received: from Exchangemail-eme6.itn.ftgroup (unknown [xx.xx.13.42]) by opfedar03.francetelecom.fr (ESMTP service) with ESMTP id 49HJwy3m4ZzCqkx; Wed, 6 May 2020 16:33:22 +0200 (CEST) From: To: "Les Ginsberg (ginsberg)" CC: "lsr@ietf.org" Thread-Topic: Flooding across a network Thread-Index: AdYi7bsxcCpCOCQDSjylEJ0cQECozgAREGJwAByiJrAAAl2gYAAA0u8g Date: Wed, 6 May 2020 14:33:22 +0000 Message-ID: <10562_1588775602_5EB2CAB2_10562_251_11_53C29892C857584299CBF5D05346208A48E3FB63@OPEXCAUBM43.corporate.adroot.infra.ftgroup> References: <24209_1588692477_5EB185FD_24209_35_1_53C29892C857584299CBF5D05346208A48E3D455@OPEXCAUBM43.corporate.adroot.infra.ftgroup> <6287_1588771252_5EB2B9B4_6287_332_1_53C29892C857584299CBF5D05346208A48E3F698@OPEXCAUBM43.corporate.adroot.infra.ftgroup> In-Reply-To: Accept-Language: fr-FR, en-US Content-Language: fr-FR X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.114.13.245] Content-Type: multipart/alternative; boundary="_000_53C29892C857584299CBF5D05346208A48E3FB63OPEXCAUBM43corp_" MIME-Version: 1.0 Archived-At: Subject: Re: [Lsr] Flooding across a network X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 06 May 2020 14:33:35 -0000 --_000_53C29892C857584299CBF5D05346208A48E3FB63OPEXCAUBM43corp_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Les, From: Les Ginsberg (ginsberg) [mailto:ginsberg@cisco.com] Sent: Wednesday, May 6, 2020 4:14 PM To: DECRAENE Bruno TGI/OLN Cc: lsr@ietf.org Subject: RE: Flooding across a network Bruno - I am somewhat at a loss to understand your comments. The example is straightforward and does not need to consider FIB update tim= e nor the ordering of prefix updates on different nodes. [Bruno] The example is straightforward but you are referring to FIB and IP = packets forwarding as per those FIBs. I'd like we focus on LSP flooding and LSDB consistency. Consider the state of Node B and Node D at various time points from the tri= gger event. T+ 2 seconds: ----------------- B has received all LSP Updates. It triggers an SPF and for all Northbound d= estinations previously reachable via C it installs paths via D. Let's assume it take 5 seconds to update the forwarding plane. D has received 40 of the 1000 LSP updates. It triggers an SPF and finds tha= t all Northbound destinations are reachable via B-C. It makes no changes to= the forwarding plane. T+7 seconds ----------------- B has completed FIB updates. Traffic to all Northbound destinations is bein= g forwarded via D. D has now received 140 of the 1000 LSP updates. Entries in its forwarding p= lane for Northbound destinations still point to B. We have a loop. T + 30 seconds -------------------- D has now received 600 of the 1000 LSP updates. Still no changes to its for= warding plane. Traffic to Northbound destinations is still looping. T+ 50 seconds ------------------- D has finally received all 1000 LSP updates. It triggers (another) SPF and calculates paths to Northbound destinations v= ia E. It begins to update its forwarding plane. Let's assume this will take 5 seconds. T + 55 seconds -------------------- D has completed forwarding plane updates - no more looping. That is all I am trying to illustrate. If you want to start arguing that node protecting LFAs + microloop avoidanc= e could help (NOTE I explicitly took those out of the example for simplici= ty) - it is easy enough to change the example to include multiple node fail= ures or a node failure plus some northbound link failures on other nodes. [Bruno] I'm not talking about LFA/FRR. And with regards to microloops avoid= ance, some algorithms can handle any graph transition so including multiple= node failures. But again, let's stick to LSP flooding and LSDB consistency. (you are the o= ne speaking about microloops in the forwarding plane). The point here is to look at the impact of long-lived LSDB inconsistency wh= ich results when some nodes support flooding an order of magnitude faster f= looding than other nodes - which is what you asked me to clarify. [Bruno] No. I asked you to clarify why having a node with faster flooding c= ould prolongs the period of LSDB inconsistency. Again, with you own words: "when only some nodes in the network support fas= ter flooding the behavior of the whole network may not be "better" when fas= ter flooding is enabled because it prolongs the period of LSDB inconsistenc= y." And with less words: "when only some nodes in the network support faster fl= ooding [...] it prolongs the period of LSDB inconsistency." --Bruno Les From: bruno.decraene@orange.com Sent: Wednesday, May 06, 2020 6:21 AM To: Les Ginsberg (ginsberg) Cc: lsr@ietf.org Subject: RE: Flooding across a network Les, From: Les Ginsberg (ginsberg) [mailto:ginsberg@cisco.com] Sent: Wednesday, May 6, 2020 1:35 AM To: DECRAENE Bruno TGI/OLN; lsr@ietf.org Subject: RE: Flooding across a network Bruno - Seems like it was not too long ago that we were discussing this in person. = Ahhh...the good old days... [Bruno] Indeed, may be not to the point of concluding. Indeed. First, let's agree that the interesting case does not involve 1 or even a s= mall number of LSPs. For those cases flooding speed does not matter. The interesting cases involve a large number of LSPs (hundreds or thousands= ). And in such cases LFA/microloop avoidance techniques are not applicable. Take the following simple topology: | | ... | | +---+ +---+ | C | | E | +---+ +---+ | | 1000 +---+ +---+ | B |-------------| D | +---+ 1000 +---+ | | | | \ / \ / \ / \ / +---+ | A | +---+ There is a topology northbound of C and E (not shown) and a topology southb= ound of A (not shown). Cost on all links is 10 except B-D and D-E where cost is high. C is a node with 1000 neighbors. When all links are up, shortest path for all northbound destinations is via= C. All nodes in the network support fast flooding except for Node D. Let's say fast flooding is 500 LSPs/second and slow flooding (Node D) is 20= LSPs/seconds. If Node C fails we have 1000 LSPs to flood. All nodes except for D can receive these in 2 seconds (plus internode delay= time). D can receive LSPs in 50 seconds. [Bruno] Thanks for your example. Agreed so far. When A and B and all southbound nodes receive/process the LSP updates they = will start sending traffic to Northbound destinations via D. But for the better part of 50 seconds, Node D has yet to receive all LSP up= dates and still believes that shortest path is via B-C. It will loop traffi= c. [Bruno] May I remind you that we are discussing IS-IS flooding in order to = sync LSDB (LSP database). That is already a big enough subject. It does not= including FIB (updates), nor IP forwarding. Quoting you "when only some nodes in the network support faster flooding th= e behavior of the whole network may not be "better" when faster flooding is= enabled because it prolongs the period of LSDB inconsistency." Taking your own examples, in both cases (all nodes support fast flooding; a= ll nodes but D support fast flooding) the period of LSDB inconsistency is 5= 0 seconds. Hence this example does not illustrate your statement. Hence I'm restating my questions: > > when only some nodes in the network support faster flooding the behavior > of the whole network may not be "better" when faster flooding is enabled > because it prolongs the period of LSDB inconsistency. > > 1) Do you have data on this? > > 2) If not, can you provide an example where increasing the flooding rate = on > one adjacency prolongs the period of LSDB inconsistency across the > network? Had all nodes used slow flooding, it still would have taken 50 seconds to c= onverge, but there would be significantly less looping. There could be a go= od amount of blackholing, but this is preferable to looping. [Bruno] You are using an example where ordering FIB updates across the netw= ork, e.g. as per [1], allows to reduce _FIB_ inconsistency across the path/= network. And you seem to conclude from this that this translates to LSDB up= date ordering. Those are two different things. In this thread, I'd suggest = that we focus on IGP flooding and LSDB sync only. (*) [1] https://tools.ietf.org/html/rfc6976 (*) We can discuss loop free IGP converge in a different thread if you want= . IMO, the use of segment routing/source routing is better than oFIB. But a= t some point, it still relies on fast flooding when multiple LSPs are invol= ved. (and I mean _fast_ not _ordered_) --Bruno One can always come up with examples - based on a specific topology and a s= pecific failure - where things might be better/worse/unchanged in the face = of inconsistent flooding speed support. But I hope this simple example illustrates the pitfalls. Les > -----Original Message----- > From: bruno.decraene@orange.com > > Sent: Tuesday, May 05, 2020 8:28 AM > To: Les Ginsberg (ginsberg) >; lsr@ietf.org > Subject: Flooding across a network > > Les, > > > From: Lsr [mailto:lsr-bounces@ietf.org] On Behalf Of Les Ginsberg > (ginsberg) > > Sent: Monday, May 4, 2020 4:39 PM > [...] > > when only some nodes in the network support faster flooding the behavior > of the whole network may not be "better" when faster flooding is enabled > because it prolongs the period of LSDB inconsistency. > > 1) Do you have data on this? > > 2) If not, can you provide an example where increasing the flooding rate = on > one adjacency prolongs the period of LSDB inconsistency across the > network? > > 3) In the meantime, let's try the theoretical analysis on a simple scenar= io > where a single LSP needs to be flooded across the network. > > - Let's call Dij the time needed to flood the LSP from node i to the adja= cent > node j. Clearly Dij>0. > - Let's call k the node originating this LSP at t0=3D0s > > >From t0, the LSDB is inconsistent across the network as all nodes but k = are > missing the LSP and hence only know about the 'old' topology. > > Let's call SPT(k) the SPT rooted on k, using Dij as the metric between > adjacent nodes i and j. Let's call SP(k,i) the shortest path from k to i;= and > D(k,i) the shortest distance between k and i. > > It seems that the time needed: > - for node j to learn about the LSP, and get in sync with k, is D(k,j) > - for all nodes across the network to learn about the LSP, and get in syn= c with > k, is Max[for all j] D(k,j) > > Then how can reducing the flooding delay on one adjacency could prolongs > the period of LSDB inconsistency? > It seems to me that it can only improve/decrease it. Otherwise, this would > mean that decreasing the cost on a link can increase the cost of the shor= test > path. > > Note: I agree that there are other cases, such as multiple LSPs originat= ed by > the same node, and multiple LSPs originated by multiple nodes, but let's = start > with the simple case. > > Thanks, > --Bruno > > > -----Original Message----- > > From: Lsr [mailto:lsr-bounces@ietf.org] On Behalf Of Les Ginsberg > (ginsberg) > > Sent: Monday, May 4, 2020 4:39 PM > > > > Henk - > > > > Thanx for your thoughtful posts. > > I have read your later posts on this thread as well - but decided to re= ply to > this one. > > Top posting for better readability. > > > > There is broad agreement that faster flooding is desirable. > > There are now two proposals as to how to address the issue - neither of > which is proposing to use TCP (or equivalent). > > > > I have commented on why IS-IS flooding requirements are significantly > different than that for which TCP is used. > > I think it is also useful to note that even the simple test case which = Bruno > reported on in last week's interim meeting demonstrated that without any > changes to the protocol at all IS-IS was able to flood an order of magnit= ude > faster than it commonly does today. > > This gives me hope that we are looking at the problem correctly and wil= l not > need "TCP". > > > > Introducing a TCP based solution requires: > > > > a)A major change to the adjacency formation logic > > > > b)Removal of the independence of the IS-IS protocol from the address > families whose reachability advertisements it supports - something which I > think is a great strength of the protocol - particularly in environments = where > multiple address family support is needed > > > > I really don't want to do either of the above. > > > > Your comments regarding PSNP response times are quite correct - and > both of the draft proposals discuss this - though I agree more detail wil= l be > required. > > It is intuitive that if you want to flood faster you also need to ACK f= aster - > and probably even retransmit faster when that is needed. > > The basic relationship between retransmit interval and PSNP interval is > expressed in ISO 10589: > > > > " partialSNPInterval - This is the amount of time between periodic > > action for transmission of Partial Sequence Number PDUs. > > It shall be less than minimumLSPTransmission-Interval." > > > > Of course ISO 10589 recommended values (2 seconds and 5 seconds > respectively) associated with a much slower flooding rate and > implementations I am aware of use values in this order of magnitude. These > numbers need to be reduced if we are to flood faster, but the relationship > between the two needs to remain the same. > > > > It is also true - as you state - that sending ACKs more quickly will re= sult in > additional PDUs which need to be received/processed by IS-IS - and this h= as > some impact. But I think it is reasonable to expect that an implementation > which can support sending and receiving LSPs at a faster rate should also= be > able to send/receive PSNPs at a faster rate. But we still need to be smar= ter > than sending one PSNP/one LSP in cases where we have a burst. > > > > LANs are a more difficult problem than P2P - and thus far draft-ginsber= g-lsr- > isis-flooding-scale has been silent on this - but not because we aren't a= ware > of this - just have focused on the P2P behavior first. > > What the best behavior on a LAN may be is something I am still consider= ing. > Slowing flooding down to the speed at which the slowest IS on the LAN can > support may not be the best strategy - as it also slows down the propagat= ion > rate for systems downstream from the nodes on the LAN which can handle > faster flooding - thereby having an impact on flooding speed throughout t= he > network in a way which may be out of proportion. This is a smaller example > of the larger issue that when only some nodes in the network support fast= er > flooding the behavior of the whole network may not be "better" when faster > flooding is enabled because it prolongs the period of LSDB inconsistency. > More work needs to be done here... > > > > In summary, I don't expect to have to "reinvent TCP" - but I do think y= ou > have provided a useful perspective for us to consider as we progress on t= his > topic, > > > > Thanx. > > > > Les > > > > > > > -----Original Message----- > > > From: Lsr > On Beha= lf Of Henk Smit > > > Sent: Thursday, April 30, 2020 6:58 AM > > > To: lsr@ietf.org > > > Subject: [Lsr] Why only a congestion-avoidance algorithm on the sender > isn't > > > enough > > > > > > > > > Hello all, > > > > > > Two years ago, Gunter Van de Velde and myself published this draft: > > > https://tools.ietf.org/html/draft-hsmit-lsr-isis-flooding-over-tcp-00 > > > That started this discussion about flow/congestion control and ISIS > > > flooding. > > > > > > My thoughts were that once we start implementing new algorithms to > > > optimize ISIS flooding speed, we'll end up with our own version of TC= P. > > > I think most people here have a good general understanding of TCP. > > > But if not, this is a good overview how TCP does it: > > > https://en.wikipedia.org/wiki/TCP_congestion_control > > > > > > > > > What does TCP do: > > > =3D=3D=3D=3D > > > TCP does 2 things: flow control and congestion control. > > > > > > 1) Flow control is: the receiver trying to prevent itself from being > > > overloaded. The receiver indicates, through the receiver-window-size > > > in the TCP acks, how much data it can or wants to receive. > > > 2) Congestion control is: the sender trying to prevent the links betw= een > > > sender and receiver from being overloaded. The sender makes an > educated > > > guess at what speed it can send. > > > > > > > > > The part we seem to be missing: > > > =3D=3D=3D=3D > > > For the sender to make a guess at what speed it can send, it looks at > > > how the transmission is behaving. Are there drops ? What is the RTT ? > > > Do drop-percentage and RTT change ? Do acks come in at the same rate > > > as the sender sends segments ? Are there duplicate acks ? To be able > > > to do this, the sender must know what to expect. How acks behave. > > > > > > If you want an ISIS sender to make a guess at what speed it can send, > > > without changing the protocol, the only thing the sender can do is lo= ok > > > at the PSNPs that come back from the receiver. But the RTT of PSNPs c= an > > > not be predicted. Because a good ISIS implementation does not > > > immediately > > > send a PSNP when it receives a LSP. 1) the receiver should jitter the > > > PSNP, > > > like it should jitter all packets. And 2) the receiver should wait a > > > little > > > to see if it can combine multiple acks into a single PSNP packet. > > > > > > In TCP, if a single segment gets lost, each new segment will cause the > > > receiver to send an ack with the seqnr of the last received byte. This > > > is called "duplicate acks". This triggers the sender to do > > > fast-retransmission. In ISIS, this can't be be done. The information > > > a sender can get from looking at incoming PSNPs is a lot less than wh= at > > > TCP can learn from incoming acks. > > > > > > > > > The problem with sender-side congestion control: > > > =3D=3D=3D=3D > > > In ISIS, all we know is that the default retransmit-interval is 5 > > > seconds. > > > And I think most implementations use that as the default. This means > > > that > > > the receiver of an LSP has one requirement: send a PSNP within 5 > > > seconds. > > > For the rest, implementations are free to send PSNPs however and > > > whenever > > > they want. This means a sender can not really make conclusions about > > > flooding speed, dropped LSPs, capacity of the receiver, etc. > > > There is no ordering when flooding LSPs, or sending PSNPs. This makes > > > a sender-side algorithm for ISIS a lot harder. > > > > > > When you think about it, you realize that a sender should wait the > > > full 5 seconds before it can make any real conclusions about dropped > > > LSPs. > > > If a sender looks at PSNPs to determine its flooding speed, it will > > > probably > > > not be able to react without a delay of a few seconds. A sender might > > > send > > > hunderds or thousands of LSPs in those 5 seconds, which might all or > > > partially be dropped, complicating matters even further. > > > > > > > > > A sender-sider algorithm should specify how to do PSNPs. > > > =3D=3D=3D=3D > > > So imho a sender-side only algorithm can't work just like that in a > > > multi-vendor environment. We must not only specify a congestion- > control > > > algorithm for the sender. We must also specify for the receiver a more > > > specific algorithm how and when to send PSNPs. At least how to do > PSNPs > > > under load. > > > > > > Note that this might result in the receiver sending more (and smaller) > > > PSNPs. > > > More packets might mean more congestion (inside routers). > > > > > > > > > Will receiver-side flow-control work ? > > > =3D=3D=3D=3D > > > I don't know if that's enough. It will certainly help. > > > > > > I think to tackle this problem, we need 3 parts: > > > 1) sender-side congestion-control algorithm > > > 2) more detailed algorithm on receiver when and how to send PSNPs > > > 3) receiver-side flow-control mechanism > > > > > > As discussed at length, I don't know if the ISIS process on the > > > receiving > > > router can actually know if its running out of resources (buffers on > > > interfaces, linecards, etc). That's implementation dependent. A recei= ver > > > can definitely advertise a fixed value. So the sender has an upper bo= und > > > to use when doing congestion-control. Just like TCP has both a > > > flow-control > > > window and a congestion-control window, and a sender uses both. > Maybe > > > the > > > receiver can even advertise a dynamic value. Maybe now, maybe only in > > > the > > > future. An advertised upper limit seems useful to me today. > > > > > > > > > What I didn't like about our own proposal (flooding over TCP): > > > =3D=3D=3D=3D > > > The problem I saw with flooding over TCP concerns multi-point networks > > > (LANs). > > > > > > When flooding over a multi-point network, setting up TCP connections > > > introduces serious challenges. Who are the endpoints of the TCP > > > connections ? > > > Full mesh ? Or do all ISes on a LAN create a TCP-connection to the DI= S ? > > > There is no backup DIS in ISIS (unlike OSPF). Things get messy quickl= y. > > > > > > However, the other two proposals do not solve this problem either. > > > How will a sender-side congestion-avoidence algorithm determine > whether > > > there were drops ? There are no acks (PSNPs) on a LAN. We assume most > > > LSPs > > > that are broadcasted are received by all other ISes on the LAN. There > > > are > > > no acks. Only after the DIS has sent its periodic CSNPs, ISes can send > > > PSNPs to request retransmissions. It seems impossible (or very hard) = to > > > me for all ISes on a LAN to keep track of dropped LSPs and adjust the= ir > > > sending speed accordingly. > > > > > > When flooding on a LAN, the receiver-side algorithm seems best. > Because > > > all ISes can see what the lowest advertised sending-speed is. And make > > > sure they send slow enough to not overload the slowest IS. I'm not su= re > > > this is a good solution, but is seems easier and more realistic than > > > ISIS-flooding-over-TCP or sender-side congestion-avoidance. > > > > > > > > > My conclusion: > > > =3D=3D=3D=3D > > > Sender-side congestion-control won't work without specifying in more > > > detail how and when to send PSNPs. > > > Receiver-side flow-control will certainly help. I dont' know if it's > > > good enough. I don't know if advertising a static value is good enoug= h. > > > But it's a start. > > > > > > I still think we'll end up re-implementing a new (and weaker) TCP. > > > > > > > > > henk. > > > > > > _______________________________________________ > > > Lsr mailing list > > > Lsr@ietf.org > > > https://www.ietf.org/mailman/listinfo/lsr > > > > _______________________________________________ > > Lsr mailing list > > Lsr@ietf.org > > https://www.ietf.org/mailman/listinfo/lsr > > __________________________________________________________ > __________________________________________________________ > _____ > > Ce message et ses pieces jointes peuvent contenir des informations > confidentielles ou privilegiees et ne doivent donc > pas etre diffuses, exploites ou copies sans autorisation. Si vous avez re= cu ce > message par erreur, veuillez le signaler > a l'expediteur et le detruire ainsi que les pieces jointes. Les messages > electroniques etant susceptibles d'alteration, > Orange decline toute responsabilite si ce message a ete altere, deforme ou > falsifie. Merci. > > This message and its attachments may contain confidential or privileged > information that may be protected by law; > they should not be distributed, used or copied without authorisation. > If you have received this email in error, please notify the sender and de= lete > this message and its attachments. > As emails may be altered, Orange is not liable for messages that have been > modified, changed or falsified. > Thank you. ___________________________________________________________________________= ______________________________________________ Ce message et ses pieces jointes peuvent contenir des informations confiden= tielles ou privilegiees et ne doivent donc pas etre diffuses, exploites ou copies sans autorisation. 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Thank you. ___________________________________________________________________________= ______________________________________________ Ce message et ses pieces jointes peuvent contenir des informations confiden= tielles ou privilegiees et ne doivent donc pas etre diffuses, exploites ou copies sans autorisation. Si vous avez recu= ce message par erreur, veuillez le signaler a l'expediteur et le detruire ainsi que les pieces jointes. Les messages el= ectroniques etant susceptibles d'alteration, Orange decline toute responsabilite si ce message a ete altere, deforme ou = falsifie. Merci. This message and its attachments may contain confidential or privileged inf= ormation that may be protected by law; they should not be distributed, used or copied without authorisation. If you have received this email in error, please notify the sender and dele= te this message and its attachments. As emails may be altered, Orange is not liable for messages that have been = modified, changed or falsified. Thank you. --_000_53C29892C857584299CBF5D05346208A48E3FB63OPEXCAUBM43corp_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Les,

 

From: Les Ginsberg (ginsberg) [mailto:ginsberg@cisco.com]
Sent: Wednesday, May 6, 2020 4:14 PM
To: DECRAENE Bruno TGI/OLN
Cc: lsr@ietf.org
Subject: RE: Flooding across a network

 

Bruno –

 

I am somewhat at a loss to understand your = comments.

The example is straightforward and does not= need to consider FIB update time nor the ordering of prefix updates on dif= ferent nodes.

[Bruno] The example is s= traightforward but you are referring to FIB and IP packets forwarding as per those FIBs.

I’d like we focus = on LSP flooding and LSDB consistency.

 

Consider the state of Node B and Node D at = various time points from the trigger event.

 

T+ 2 seconds:

-----------------

B has received all LSP Updates. It triggers= an SPF and for all Northbound destinations previously reachable via C it i= nstalls paths via D.

Let’s assume it take 5 seconds to upd= ate the forwarding plane.

 

D has received 40 of the 1000 LSP updates. = It triggers an SPF and finds that all Northbound destinations are reachable= via B-C. It makes no changes to the forwarding plane.

 

T+7 seconds

-----------------

B has completed FIB updates. Traffic to all= Northbound destinations is being forwarded via D.

 

D has now received 140 of the 1000 LSP upda= tes. Entries in its forwarding plane for Northbound destinations still poin= t to B.

 

We have a loop.

 

T + 30 seconds

--------------------

D has now received 600 of the 1000 LSP upda= tes. Still no changes to its forwarding plane.

Traffic to Northbound destinations is still= looping.

 

T+ 50 seconds

-------------------

D has finally received all 1000 LSP updates= .

It triggers (another) SPF and calculates pa= ths to Northbound destinations via E. It begins to update its forwarding pl= ane.

Let’s assume this will take 5 seconds= .

 

T + 55 seconds

--------------------

D has completed forwarding plane updates &#= 8211; no more looping.

 

That is all I am trying to illustrate.=

 

If you want to start arguing that node prot= ecting LFAs + microloop avoidance could help (NOTE I explicitly  t= ook those out of the example for simplicity) – it is easy enough to change the example to include multiple node failures or = a node failure plus some northbound link failures on other nodes.

[Bruno] I’m not ta= lking about LFA/FRR. And with regards to microloops avoidance, some algorithms can han= dle any graph transition so including multiple node failures.

 =

But again, let’s s= tick to LSP flooding and LSDB consistency. (you are the one speaking about microloops in the forward= ing plane).

 =

The point here is to look at the impact of = long-lived LSDB inconsistency which results when some nodes support floodin= g an order of magnitude faster flooding than other nodes – which is what you asked me to clarify.=

[Bruno] No. I asked you to clarify why having a node with faster flooding could p= rolongs the period of LSDB inconsistency.

 

Again, with you own words: “when only some nodes in = the network support faster flooding the behavior of the whole network may n= ot be "better" when faster flooding is enabled because it prolongs the period of LSDB inconsistency.”

And with less words: “when only some nodes in the ne= twork support faster flooding […]  it prolongs the period of LSD= B inconsistency.”

 

--Bruno

 

   Les

 

 

 

From: bruno.decraene@orange.com <bruno.decraen= e@orange.com>
Sent: Wednesday, May 06, 2020 6:21 AM
To: Les Ginsberg (ginsberg) <ginsberg@cisco.com>
Cc: lsr@ietf.org
Subject: RE: Flooding across a network

 

Les,

 

From: Les Ginsberg (ginsberg) [mailto:ginsberg@cisco.com]
Sent: Wednesday, May 6, 2020 1:35 AM
To: DECRAENE Bruno TGI/OLN; lsr@ietf= .org
Subject: RE: Flooding across a network

 

Bruno -

 

Seems like it was not too long ago that = we were discussing this in person.  Ahhh...the good old days...

[Bruno] Indeed, may be not= to the point of concluding. Indeed.

 

First, let's agree that the interesting = case does not involve 1 or even a small number of LSPs. For those cases flo= oding speed does not matter.

The interesting cases involve a large nu= mber of LSPs (hundreds or thousands). And in such cases LFA/microloop avoid= ance techniques are not applicable.

 

Take the following simple topology:=

 

   |  | ... |     &= nbsp;      |

     +---+   &nb= sp;         +---+

     | C |     = ;        | E |

     +---+   &nb= sp;         +---+

       |   &nb= sp;             = ;| 1000

     +---+   &nb= sp;         +---+

     | B |-------------| D |=

     +---+   1000&nbs= p;     +---+

       |   &nb= sp;            = |

       |   &nb= sp;            = |

        \  &nb= sp;            /

         \ &nb= sp;          /

          \&nb= sp;        /

          = ; \      /

          = ;   +---+

          = ;   | A |

          = ;   +---+

 

There is a topology northbound of C and = E (not shown) and a topology southbound of A (not shown).=

Cost on all links is 10 except B-D and D= -E where cost is high.

 

C is a node with 1000 neighbors.

When all links are up, shortest path for= all northbound destinations is via C.

All nodes in the network support fast fl= ooding except for Node D.

Let’s say fast flooding is 500 LSP= s/second and slow flooding (Node D) is 20 LSPs/seconds.

If  Node C fails we have 1000 LSPs = to flood.

All nodes except for D can receive these= in 2 seconds (plus internode delay time).

D can receive LSPs in 50 seconds.

 

[Bruno] Thanks for your ex= ample. Agreed so far.

 

When A and B and all southbound nodes re= ceive/process the LSP updates they will start sending traffic to Northbound= destinations via D.

But for the better part of 50 seconds, N= ode D has yet to receive all LSP updates and still believes that shortest p= ath is via B-C. It will loop traffic.

 

[Bruno] May I remind you t= hat we are discussing IS-IS flooding in order to sync LSDB (LSP database). = That is already a big enough subject. It does not including FIB (updates), nor IP forwarding.

 

Quoting you “when on= ly some nodes in the network support faster flooding the behavior of the wh= ole network may not be "better" when faster flooding is enabled because it prolongs the period of LSDB inconsistency.”

 

Taking your own examples, = in both cases (all nodes support fast flooding; all nodes but D support fas= t flooding) the period of LSDB inconsistency is 50 seconds. Hence this example does not illustrate your statement.=

 

Hence I’m restating = my questions:

 

> > when only some n= odes in the network support faster flooding the behavior<= /p>

> of the whole network = may not be "better" when faster flooding is enabled

> because it prolongs t= he period of LSDB inconsistency.

> 

> 1) Do you have data o= n this?

>

> 2) If not, can you pr= ovide an example where increasing the flooding rate on

> one adjacency prolong= s the period of LSDB inconsistency across the

> network?

 

 

Had all nodes used slow flooding, it sti= ll would have taken 50 seconds to converge, but there would be significantl= y less looping. There could be a good amount of blackholing, but this is preferable to looping.

[Bruno] You are using an e= xample where ordering FIB updates across the network, e.g. as per [1], allo= ws to reduce _FIB_ inconsistency across the path/network. And you seem to conclude from this that this tran= slates to LSDB update ordering. Those are two different things. In this thr= ead, I’d suggest that we focus on IGP flooding and LSDB sync only. (*= )

[1] https://tools.ietf.org/html= /rfc6976

(*) We can discuss loop fr= ee IGP converge in a different thread if you want. IMO, the use of segment = routing/source routing is better than oFIB. But at some point, it still relies on fast flooding when multiple LSPs are= involved. (and I mean _fast_ not _ordered_)

 

--Bruno<= /p>

 

One can always come up with examples = 211; based on a specific topology and a specific failure - where things mig= ht be better/worse/unchanged in the face of inconsistent flooding speed support.

But I hope this simple example illustrat= es the pitfalls.

 

    Les=

 

> -----Original Message-----

> From: bruno.decraene@orange.com = <bruno.decraene@orange.com<= /a>>

> Sent: Tuesday, May 05, 2020 8:28 AM=

> To: Les Ginsberg (ginsberg) <ginsberg@cisco.com>; lsr@ietf.org

> Subject: Flooding across a network<= o:p>

>

> Les,

>

> > From: Lsr [mailto:lsr-bounces@ietf.org] On Behalf Of Les Ginsberg

> (ginsberg)

> > Sent: Monday, May 4, 2020 4:39= PM

> [...]

> > when only some nodes in the ne= twork support faster flooding the behavior

> of the whole network may not be &qu= ot;better" when faster flooding is enabled

> because it prolongs the period of L= SDB inconsistency.

>

> 1) Do you have data on this?

>

> 2) If not, can you provide an examp= le where increasing the flooding rate on

> one adjacency prolongs the period o= f LSDB inconsistency across the

> network?

>

> 3) In the meantime, let's try the t= heoretical analysis on a simple scenario

> where a single LSP needs to be floo= ded across the network.

>

> - Let's call Dij the time needed to= flood the LSP from node i to the adjacent

> node j. Clearly Dij>0.

> - Let's call k the node originating= this LSP at t0=3D0s

>

> >From t0, the LSDB is inconsiste= nt across the network as all nodes but k are

> missing the LSP and hence only know= about the 'old' topology.

>

> Let's call  SPT(k) the SPT roo= ted on k, using Dij as the metric between

> adjacent nodes i and j. Let's call = SP(k,i) the shortest path from k to i; and

> D(k,i) the shortest distance betwee= n k and i.

>

> It seems that the time needed:=

> - for node j to learn about the LSP= , and get in sync with k, is D(k,j)

> - for all nodes across the network = to learn about the LSP, and get in sync with

> k, is Max[for all j] D(k,j)

>

> Then how can reducing the flooding = delay on one adjacency could prolongs

> the period of LSDB inconsistency?

> It seems to me that it can only imp= rove/decrease it. Otherwise, this would

> mean that decreasing the cost on a = link can increase the cost of the shortest

> path.

>

> Note: I agree that there are other = cases, such as  multiple LSPs originated by

> the same node, and multiple LSPs or= iginated by multiple nodes, but let's start

> with the simple case.

>

> Thanks,

> --Bruno

>

> > -----Original Message-----

> > From: Lsr [mailto:lsr-bounces@ietf.org] On Behalf Of Les Ginsberg

> (ginsberg)

> > Sent: Monday, May 4, 2020 4:39= PM

> >

> > Henk -

> >

> > Thanx for your thoughtful post= s.

> > I have read your later posts o= n this thread as well - but decided to reply to

> this one.

> > Top posting for better readabi= lity.

> >

> > There is broad agreement that = faster flooding is desirable.

> > There are now two proposals as= to how to address the issue - neither of

> which is proposing to use TCP (or e= quivalent).

> >

> > I have commented on why IS-IS = flooding requirements are significantly

> different than that for which TCP i= s used.

> > I think it is also useful to n= ote that even the simple test case which Bruno

> reported on in last week's interim = meeting demonstrated that without any

> changes to the protocol at all IS-I= S was able to flood an order of magnitude

> faster than it commonly does today.=

> > This gives me hope that we are= looking at the problem correctly and will not

> need "TCP".

> >

> > Introducing a TCP based soluti= on requires:

> >

> > a)A major change to the adjace= ncy formation logic

> >

> > b)Removal of the independence = of the IS-IS protocol from the address

> families whose reachability adverti= sements it supports - something which I

> think is a great strength of the pr= otocol - particularly in environments where

> multiple address family support is = needed

> >

> > I really don't want to do eith= er of the above.

> >

> > Your comments regarding PSNP r= esponse times are quite correct - and

> both of the draft proposals discuss= this - though I agree more detail will be

> required.

> > It is intuitive that if you wa= nt to flood faster you also need to ACK faster -

> and probably even retransmit faster= when that is needed.

> > The basic relationship between= retransmit interval and PSNP interval is

> expressed in ISO 10589:<= /span>

> >

> > " partialSNPInterval - Th= is is the amount of time between periodic

>       = ;  > action for transmission of Partial Sequence Number PDUs.<= o:p>

>       = ;  > It shall be less than minimumLSPTransmission-Interval.&qu= ot;

> >

> > Of course ISO 10589 recommende= d values (2 seconds and 5 seconds

> respectively) associated with a muc= h slower flooding rate and

> implementations I am aware of use v= alues in this order of magnitude. These

> numbers need to be reduced if we ar= e to flood faster, but the relationship

> between the two needs to remain the= same.

> >

> > It is also true - as you state= - that sending ACKs more quickly will result in

> additional PDUs which need to be re= ceived/processed by IS-IS - and this has

> some impact. But I think it is reas= onable to expect that an implementation

> which can support sending and recei= ving LSPs at a faster rate should also be

> able to send/receive PSNPs at a fas= ter rate. But we still need to be smarter

> than sending one PSNP/one LSP in ca= ses where we have a burst.

> >

> > LANs are a more difficult prob= lem than P2P - and thus far draft-ginsberg-lsr-

> isis-flooding-scale has been silent= on this - but not because we aren't aware

> of this - just have focused on the = P2P behavior first.

> > What the best behavior on a LA= N may be is something I am still considering.

> Slowing flooding down to the speed = at which the slowest IS on the LAN can

> support may not be the best strateg= y - as it also slows down the propagation

> rate for systems downstream from th= e nodes on the LAN which can handle

> faster flooding - thereby having an= impact on flooding speed throughout the

> network in a way which may be out o= f proportion. This is a smaller example

> of the larger issue that when only = some nodes in the network support faster

> flooding the behavior of the whole = network may not be "better" when faster

> flooding is enabled because it prol= ongs the period of LSDB inconsistency.

> More work needs to be done here...<= o:p>

> >

> > In summary, I don't expect to = have to "reinvent TCP" - but I do think you

> have provided a useful perspective = for us to consider as we progress on this

> topic,

> >

> > Thanx.

> >

>     > Les

> >

> >

> > > -----Original Message----= -

> > > From: Lsr <lsr-bounces@ietf.org> On Behalf Of Henk Smit

> > > Sent: Thursday, April 30,= 2020 6:58 AM

> > > To: lsr@ietf.org

> > > Subject: [Lsr] Why only a= congestion-avoidance algorithm on the sender

> isn't

> > > enough<= /p>

> > >

> > >

> > > Hello all,

> > >

> > > Two years ago, Gunter Van= de Velde and myself published this draft:

> > > https://tools.ietf.org/html/draft-hsmit-lsr-isis-flooding-over-tcp-00=

> > > That started this discuss= ion about flow/congestion control and ISIS

> > > flooding.

> > >

> > > My thoughts were that onc= e we start implementing new algorithms to

> > > optimize ISIS flooding sp= eed, we'll end up with our own version of TCP.

> > > I think most people here = have a good general understanding of TCP.

> > > But if not, this is a goo= d overview how TCP does it:

> > > https://en.= wikipedia.org/wiki/TCP_congestion_control

> > >

> > >

> > > What does TCP do:

> > > =3D=3D=3D=3D

> > > TCP does 2 things: flow c= ontrol and congestion control.

> > >

> > > 1) Flow control is: the r= eceiver trying to prevent itself from being

> > > overloaded. The receiver = indicates, through the receiver-window-size

> > > in the TCP acks, how much= data it can or wants to receive.

> > > 2) Congestion control is:= the sender trying to prevent the links between

> > > sender and receiver from = being overloaded. The sender makes an

> educated

> > > guess at what speed it ca= n send.

> > >

> > >

> > > The part we seem to be mi= ssing:

> > > =3D=3D=3D=3D

> > > For the sender to make a = guess at what speed it can send, it looks at

> > > how the transmission is b= ehaving. Are there drops ? What is the RTT ?

> > > Do drop-percentage and RT= T change ? Do acks come in at the same rate

> > > as the sender sends segme= nts ? Are there duplicate acks ? To be able

> > > to do this, the sender mu= st know what to expect. How acks behave.

> > >

> > > If you want an ISIS sende= r to make a guess at what speed it can send,

> > > without changing the prot= ocol, the only thing the sender can do is look

> > > at the PSNPs that come ba= ck from the receiver. But the RTT of PSNPs can

> > > not be predicted. Because= a good ISIS implementation does not

> > > immediately

> > > send a PSNP when it recei= ves a LSP. 1) the receiver should jitter the

> > > PSNP,

> > > like it should jitter all= packets. And 2) the receiver should wait a

> > > little<= /p>

> > > to see if it can combine = multiple acks into a single PSNP packet.

> > >

> > > In TCP, if a single segme= nt gets lost, each new segment will cause the

> > > receiver to send an ack w= ith the seqnr of the last received byte. This

> > > is called "duplicate= acks". This triggers the sender to do

> > > fast-retransmission. In I= SIS, this can't be be done. The information

> > > a sender can get from loo= king at incoming PSNPs is a lot less than what

> > > TCP can learn from incomi= ng acks.

> > >

> > >

> > > The problem with sender-s= ide congestion control:

> > > =3D=3D=3D=3D

> > > In ISIS, all we know is t= hat the default retransmit-interval is 5

> > > seconds.

> > > And I think most implemen= tations use that as the default. This means

> > > that

> > > the receiver of an LSP ha= s one requirement: send a PSNP within 5

> > > seconds.

> > > For the rest, implementat= ions are free to send PSNPs however and

> > > whenever

> > > they want. This means a s= ender can not really make conclusions about

> > > flooding speed, dropped L= SPs, capacity of the receiver, etc.

> > > There is no ordering when= flooding LSPs, or sending PSNPs. This makes

> > > a sender-side algorithm f= or ISIS a lot harder.

> > >

> > > When you think about it, = you realize that a sender should wait the

> > > full 5 seconds before it = can make any real conclusions about dropped

> > > LSPs.

> > > If a sender looks at PSNP= s to determine its flooding speed, it will

> > > probably

> > > not be able to react with= out a delay of a few seconds. A sender might

> > > send

> > > hunderds or thousands of = LSPs in those 5 seconds, which might all or

> > > partially be dropped, com= plicating matters even further.

> > >

> > >

> > > A sender-sider algorithm = should specify how to do PSNPs.

> > > =3D=3D=3D=3D

> > > So imho a sender-side onl= y algorithm can't work just like that in a

> > > multi-vendor environment.= We must not only specify a congestion-

> control

> > > algorithm for the sender.= We must also specify for the receiver a more

> > > specific algorithm how an= d when to send PSNPs. At least how to do

> PSNPs

> > > under load.

> > >

> > > Note that this might resu= lt in the receiver sending more (and smaller)

> > > PSNPs.<= /p>

> > > More packets might mean m= ore congestion (inside routers).

> > >

> > >

> > > Will receiver-side flow-c= ontrol work ?

> > > =3D=3D=3D=3D

> > > I don't know if that's en= ough. It will certainly help.

> > >

> > > I think to tackle this pr= oblem, we need 3 parts:

> > > 1) sender-side congestion= -control algorithm

> > > 2) more detailed algorith= m on receiver when and how to send PSNPs

> > > 3) receiver-side flow-con= trol mechanism

> > >

> > > As discussed at length, I= don't know if the ISIS process on the

> > > receiving

> > > router can actually know = if its running out of resources (buffers on

> > > interfaces, linecards, et= c). That's implementation dependent. A receiver

> > > can definitely advertise = a fixed value. So the sender has an upper bound

> > > to use when doing congest= ion-control. Just like TCP has both a

> > > flow-control

> > > window and a congestion-c= ontrol window, and a sender uses both.

> Maybe

> > > the

> > > receiver can even adverti= se a dynamic value. Maybe now, maybe only in

> > > the

> > > future. An advertised upp= er limit seems useful to me today.

> > >

> > >

> > > What I didn't like about = our own proposal (flooding over TCP):

> > > =3D=3D=3D=3D

> > > The problem I saw with fl= ooding over TCP concerns multi-point networks

> > > (LANs).=

> > >

> > > When flooding over a mult= i-point network, setting up TCP connections

> > > introduces serious challe= nges. Who are the endpoints of the TCP

> > > connections ?<= /span>

> > > Full mesh ? Or do all ISe= s on a LAN create a TCP-connection to the DIS ?

> > > There is no backup DIS in= ISIS (unlike OSPF). Things get messy quickly.

> > >

> > > However, the other two pr= oposals do not solve this problem either.

> > > How will a sender-side co= ngestion-avoidence algorithm determine

> whether

> > > there were drops ? There = are no acks (PSNPs) on a LAN. We assume most

> > > LSPs

> > > that are broadcasted are = received by all other ISes on the LAN. There

> > > are

> > > no acks. Only after the D= IS has sent its periodic CSNPs, ISes can send

> > > PSNPs to request retransm= issions. It seems impossible (or very hard) to

> > > me for all ISes on a LAN = to keep track of dropped LSPs and adjust their

> > > sending speed accordingly= .

> > >

> > > When flooding on a LAN, t= he receiver-side algorithm seems best.

> Because

> > > all ISes can see what the= lowest advertised sending-speed is. And make

> > > sure they send slow enoug= h to not overload the slowest IS. I'm not sure

> > > this is a good solution, = but is seems easier and more realistic than

> > > ISIS-flooding-over-TCP or= sender-side congestion-avoidance.

> > >

> > >

> > > My conclusion:=

> > > =3D=3D=3D=3D

> > > Sender-side congestion-co= ntrol won't work without specifying in more

> > > detail how and when to se= nd PSNPs.

> > > Receiver-side flow-contro= l will certainly help. I dont' know if it's

> > > good enough. I don't know= if advertising a static value is good enough.

> > > But it's a start.

> > >

> > > I still think we'll end u= p re-implementing a new (and weaker) TCP.

> > >

> > >

> > > henk.

> > >

> > > _________________________= ______________________

> > > Lsr mailing list

> > > Lsr@ietf.org

> > > https://www.ietf.org/m= ailman/listinfo/lsr

> >

> > ______________________________= _________________

> > Lsr mailing list

> > Lsr@ietf.org

> > https://www.ietf.org/m= ailman/listinfo/lsr

>

> ___________________________________= _______________________

> ___________________________________= _______________________

> _____

>

> Ce message et ses pieces jointes pe= uvent contenir des informations

> confidentielles ou privilegiees et = ne doivent donc

> pas etre diffuses, exploites ou cop= ies sans autorisation. Si vous avez recu ce

> message par erreur, veuillez le sig= naler

> a l'expediteur et le detruire ainsi= que les pieces jointes. Les messages

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> Orange decline toute responsabilite= si ce message a ete altere, deforme ou

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>

> This message and its attachments ma= y contain confidential or privileged

> information that may be protected b= y law;

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> If you have received this email in = error, please notify the sender and delete

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> As emails may be altered, Orange is= not liable for messages that have been

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Orange decline toute responsabilite si ce=
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--_000_53C29892C857584299CBF5D05346208A48E3FB63OPEXCAUBM43corp_-- From nobody Wed May 6 07:48:35 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id C10403A07E0 for ; Wed, 6 May 2020 07:48:32 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.897 X-Spam-Level: X-Spam-Status: No, score=-1.897 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, SPF_HELO_NONE=0.001, SPF_NONE=0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id dR7tuUEs9U2H for ; Wed, 6 May 2020 07:48:29 -0700 (PDT) Received: from smtp.chopps.org (smtp.chopps.org [54.88.81.56]) by ietfa.amsl.com (Postfix) with ESMTP id 72BD03A07B5 for ; Wed, 6 May 2020 07:48:29 -0700 (PDT) Received: from stubbs.int.chopps.org (047-050-069-038.biz.spectrum.com [47.50.69.38]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by smtp.chopps.org (Postfix) with ESMTPSA id 920CC6120A; Wed, 6 May 2020 14:48:28 +0000 (UTC) Content-Type: text/plain; charset=utf-8 Mime-Version: 1.0 (Mac OS X Mail 13.4 \(3608.80.23.2.2\)) From: Christian Hopps In-Reply-To: <10562_1588775602_5EB2CAB2_10562_251_11_53C29892C857584299CBF5D05346208A48E3FB63@OPEXCAUBM43.corporate.adroot.infra.ftgroup> Date: Wed, 6 May 2020 10:48:27 -0400 Cc: Christian Hopps , "Les Ginsberg (ginsberg)" , "lsr@ietf.org" Content-Transfer-Encoding: quoted-printable Message-Id: <87CDE7F3-E08D-4C45-9AF1-9DAD635F8908@chopps.org> References: <24209_1588692477_5EB185FD_24209_35_1_53C29892C857584299CBF5D05346208A48E3D455@OPEXCAUBM43.corporate.adroot.infra.ftgroup> <6287_1588771252_5EB2B9B4_6287_332_1_53C29892C857584299CBF5D05346208A48E3F698@OPEXCAUBM43.corporate.adroot.infra.ftgroup> <10562_1588775602_5EB2CAB2_10562_251_11_53C29892C857584299CBF5D05346208A48E3FB63@OPEXCAUBM43.corporate.adroot.infra.ftgroup> To: bruno.decraene@orange.com X-Mailer: Apple Mail (2.3608.80.23.2.2) Archived-At: Subject: Re: [Lsr] Flooding across a network X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 06 May 2020 14:48:33 -0000 Bruno persistence has made me realize something fundamental here. The minute the LSP originator changes the LSP and floods it you have = LSDB inconsistency. That is going to last until the last node in the = network has updated it's LSDB. Les is pointing out that LSDB inconsistency can be bad in certain = circumstances e.g., if a critical node is slow and thus inconsistent. I believe the right way to fix this is a simple one, help the operator = flag the broken router software/hardware for replacement, but otherwise = IS-IS should just try to do the best job it can do to which is to flood = around the problem (i.e., flood as optimally as possible). Thanks, Chris. [as WG member] > On May 6, 2020, at 10:33 AM, bruno.decraene@orange.com wrote: >=20 > Les, > =20 > From: Les Ginsberg (ginsberg) [mailto:ginsberg@cisco.com]=20 > Sent: Wednesday, May 6, 2020 4:14 PM > To: DECRAENE Bruno TGI/OLN > Cc: lsr@ietf.org > Subject: RE: Flooding across a network > =20 > Bruno =E2=80=93 > =20 > I am somewhat at a loss to understand your comments. > The example is straightforward and does not need to consider FIB = update time nor the ordering of prefix updates on different nodes. > [Bruno] The example is straightforward but you are referring to FIB = and IP packets forwarding as per those FIBs. > I=E2=80=99d like we focus on LSP flooding and LSDB consistency. > =20 > Consider the state of Node B and Node D at various time points from = the trigger event. > =20 > T+ 2 seconds: > ----------------- > B has received all LSP Updates. It triggers an SPF and for all = Northbound destinations previously reachable via C it installs paths via = D. > Let=E2=80=99s assume it take 5 seconds to update the forwarding plane. > =20 > D has received 40 of the 1000 LSP updates. It triggers an SPF and = finds that all Northbound destinations are reachable via B-C. It makes = no changes to the forwarding plane. > =20 > T+7 seconds > ----------------- > B has completed FIB updates. Traffic to all Northbound destinations is = being forwarded via D. > =20 > D has now received 140 of the 1000 LSP updates. Entries in its = forwarding plane for Northbound destinations still point to B. > =20 > We have a loop. > =20 > T + 30 seconds > -------------------- > D has now received 600 of the 1000 LSP updates. Still no changes to = its forwarding plane. > Traffic to Northbound destinations is still looping. > =20 > T+ 50 seconds > ------------------- > D has finally received all 1000 LSP updates.. > It triggers (another) SPF and calculates paths to Northbound = destinations via E. It begins to update its forwarding plane. > Let=E2=80=99s assume this will take 5 seconds.. > =20 > T + 55 seconds > -------------------- > D has completed forwarding plane updates =E2=80=93 no more looping. > =20 > That is all I am trying to illustrate. > =20 > If you want to start arguing that node protecting LFAs + microloop = avoidance could help (NOTE I explicitly took those out of the example = for simplicity) =E2=80=93 it is easy enough to change the example to = include multiple node failures or a node failure plus some northbound = link failures on other nodes. > [Bruno] I=E2=80=99m not talking about LFA/FRR. And with regards to = microloops avoidance, some algorithms can handle any graph transition so = including multiple node failures. > =20 > But again, let=E2=80=99s stick to LSP flooding and LSDB consistency. = (you are the one speaking about microloops in the forwarding plane). > =20 > The point here is to look at the impact of long-lived LSDB = inconsistency which results when some nodes support flooding an order of = magnitude faster flooding than other nodes =E2=80=93 which is what you = asked me to clarify. > [Bruno] No. I asked you to clarify why having a node with faster = flooding could prolongs the period of LSDB inconsistency. > =20 > Again, with you own words: =E2=80=9Cwhen only some nodes in the = network support faster flooding the behavior of the whole network may = not be "better" when faster flooding is enabled because it prolongs the = period of LSDB inconsistency.=E2=80=9D > And with less words: =E2=80=9Cwhen only some nodes in the network = support faster flooding [=E2=80=A6] it prolongs the period of LSDB = inconsistency.=E2=80=9D > =20 > --Bruno > =20 > Les > =20 > =20 > =20 > From: bruno.decraene@orange.com =20 > Sent: Wednesday, May 06, 2020 6:21 AM > To: Les Ginsberg (ginsberg) > Cc: lsr@ietf.org > Subject: RE: Flooding across a network > =20 > Les, > =20 > From: Les Ginsberg (ginsberg) [mailto:ginsberg@cisco.com]=20 > Sent: Wednesday, May 6, 2020 1:35 AM > To: DECRAENE Bruno TGI/OLN; lsr@ietf..org > Subject: RE: Flooding across a network > =20 > Bruno - > =20 > Seems like it was not too long ago that we were discussing this in = person. Ahhh...the good old days... > [Bruno] Indeed, may be not to the point of concluding. Indeed. > =20 > First, let's agree that the interesting case does not involve 1 or = even a small number of LSPs. For those cases flooding speed does not = matter. > The interesting cases involve a large number of LSPs (hundreds or = thousands). And in such cases LFA/microloop avoidance techniques are not = applicable. > =20 > Take the following simple topology: > =20 > | | ... | | > +---+ +---+ > | C | | E | > +---+ +---+ > | | 1000 > +---+ +---+ > | B |-------------| D | > +---+ 1000 +---+ > | | > | | > \ / > \ / > \ / > \ / > +---+ > | A | > +---+ > =20 > There is a topology northbound of C and E (not shown) and a topology = southbound of A (not shown). > Cost on all links is 10 except B-D and D-E where cost is high. > =20 > C is a node with 1000 neighbors. > When all links are up, shortest path for all northbound destinations = is via C. > All nodes in the network support fast flooding except for Node D. > Let=E2=80=99s say fast flooding is 500 LSPs/second and slow flooding = (Node D) is 20 LSPs/seconds. > If Node C fails we have 1000 LSPs to flood. > All nodes except for D can receive these in 2 seconds (plus internode = delay time). > D can receive LSPs in 50 seconds. > =20 > [Bruno] Thanks for your example. Agreed so far. > =20 > When A and B and all southbound nodes receive/process the LSP updates = they will start sending traffic to Northbound destinations via D. > But for the better part of 50 seconds, Node D has yet to receive all = LSP updates and still believes that shortest path is via B-C. It will = loop traffic. > =20 > [Bruno] May I remind you that we are discussing IS-IS flooding in = order to sync LSDB (LSP database). That is already a big enough subject. = It does not including FIB (updates), nor IP forwarding. > =20 > Quoting you =E2=80=9Cwhen only some nodes in the network support = faster flooding the behavior of the whole network may not be "better" = when faster flooding is enabled because it prolongs the period of LSDB = inconsistency.=E2=80=9D > =20 > Taking your own examples, in both cases (all nodes support fast = flooding; all nodes but D support fast flooding) the period of LSDB = inconsistency is 50 seconds. Hence this example does not illustrate your = statement. > =20 > Hence I=E2=80=99m restating my questions: > =20 > > > when only some nodes in the network support faster flooding the = behavior > > of the whole network may not be "better" when faster flooding is = enabled > > because it prolongs the period of LSDB inconsistency. > >=20 > > 1) Do you have data on this? > > > > 2) If not, can you provide an example where increasing the flooding = rate on > > one adjacency prolongs the period of LSDB inconsistency across the > > network? > =20 > =20 > Had all nodes used slow flooding, it still would have taken 50 seconds = to converge, but there would be significantly less looping. There could = be a good amount of blackholing, but this is preferable to looping. > [Bruno] You are using an example where ordering FIB updates across the = network, e.g. as per [1], allows to reduce _FIB_ inconsistency across = the path/network. And you seem to conclude from this that this = translates to LSDB update ordering. Those are two different things. In = this thread, I=E2=80=99d suggest that we focus on IGP flooding and LSDB = sync only. (*) > [1] https://tools.ietf.org/html/rfc6976 > (*) We can discuss loop free IGP converge in a different thread if you = want. IMO, the use of segment routing/source routing is better than = oFIB. But at some point, it still relies on fast flooding when multiple = LSPs are involved. (and I mean _fast_ not _ordered_) > =20 > --Bruno > =20 > One can always come up with examples =E2=80=93 based on a specific = topology and a specific failure - where things might be = better/worse/unchanged in the face of inconsistent flooding speed = support. > But I hope this simple example illustrates the pitfalls. > =20 > Les > =20 > > -----Original Message----- > > From: bruno.decraene@orange.com > > Sent: Tuesday, May 05, 2020 8:28 AM > > To: Les Ginsberg (ginsberg) ; lsr@ietf.org > > Subject: Flooding across a network > > > > Les, > > > > > From: Lsr [mailto:lsr-bounces@ietf.org] On Behalf Of Les Ginsberg > > (ginsberg) > > > Sent: Monday, May 4, 2020 4:39 PM > > [...] > > > when only some nodes in the network support faster flooding the = behavior > > of the whole network may not be "better" when faster flooding is = enabled > > because it prolongs the period of LSDB inconsistency. > > > > 1) Do you have data on this? > > > > 2) If not, can you provide an example where increasing the flooding = rate on > > one adjacency prolongs the period of LSDB inconsistency across the > > network? > > > > 3) In the meantime, let's try the theoretical analysis on a simple = scenario > > where a single LSP needs to be flooded across the network. > > > > - Let's call Dij the time needed to flood the LSP from node i to the = adjacent > > node j. Clearly Dij>0. > > - Let's call k the node originating this LSP at t0=3D0s > > > > >=46rom t0, the LSDB is inconsistent across the network as all nodes = but k are > > missing the LSP and hence only know about the 'old' topology. > > > > Let's call SPT(k) the SPT rooted on k, using Dij as the metric = between > > adjacent nodes i and j. Let's call SP(k,i) the shortest path from k = to i; and > > D(k,i) the shortest distance between k and i. > > > > It seems that the time needed: > > - for node j to learn about the LSP, and get in sync with k, is = D(k,j) > > - for all nodes across the network to learn about the LSP, and get = in sync with > > k, is Max[for all j] D(k,j) > > > > Then how can reducing the flooding delay on one adjacency could = prolongs > > the period of LSDB inconsistency? > > It seems to me that it can only improve/decrease it. Otherwise, this = would > > mean that decreasing the cost on a link can increase the cost of the = shortest > > path. > > > > Note: I agree that there are other cases, such as multiple LSPs = originated by > > the same node, and multiple LSPs originated by multiple nodes, but = let's start > > with the simple case. > > > > Thanks, > > --Bruno > > > > > -----Original Message----- > > > From: Lsr [mailto:lsr-bounces@ietf.org] On Behalf Of Les Ginsberg > > (ginsberg) > > > Sent: Monday, May 4, 2020 4:39 PM > > > > > > Henk - > > > > > > Thanx for your thoughtful posts. > > > I have read your later posts on this thread as well - but decided = to reply to > > this one. > > > Top posting for better readability. > > > > > > There is broad agreement that faster flooding is desirable. > > > There are now two proposals as to how to address the issue - = neither of > > which is proposing to use TCP (or equivalent). > > > > > > I have commented on why IS-IS flooding requirements are = significantly > > different than that for which TCP is used. > > > I think it is also useful to note that even the simple test case = which Bruno > > reported on in last week's interim meeting demonstrated that without = any > > changes to the protocol at all IS-IS was able to flood an order of = magnitude > > faster than it commonly does today. > > > This gives me hope that we are looking at the problem correctly = and will not > > need "TCP". > > > > > > Introducing a TCP based solution requires: > > > > > > a)A major change to the adjacency formation logic > > > > > > b)Removal of the independence of the IS-IS protocol from the = address > > families whose reachability advertisements it supports - something = which I > > think is a great strength of the protocol - particularly in = environments where > > multiple address family support is needed > > > > > > I really don't want to do either of the above. > > > > > > Your comments regarding PSNP response times are quite correct - = and > > both of the draft proposals discuss this - though I agree more = detail will be > > required. > > > It is intuitive that if you want to flood faster you also need to = ACK faster - > > and probably even retransmit faster when that is needed. > > > The basic relationship between retransmit interval and PSNP = interval is > > expressed in ISO 10589: > > > > > > " partialSNPInterval - This is the amount of time between periodic > > > action for transmission of Partial Sequence Number PDUs. > > > It shall be less than minimumLSPTransmission-Interval." > > > > > > Of course ISO 10589 recommended values (2 seconds and 5 seconds > > respectively) associated with a much slower flooding rate and > > implementations I am aware of use values in this order of magnitude. = These > > numbers need to be reduced if we are to flood faster, but the = relationship > > between the two needs to remain the same. > > > > > > It is also true - as you state - that sending ACKs more quickly = will result in > > additional PDUs which need to be received/processed by IS-IS - and = this has > > some impact. But I think it is reasonable to expect that an = implementation > > which can support sending and receiving LSPs at a faster rate should = also be > > able to send/receive PSNPs at a faster rate. But we still need to be = smarter > > than sending one PSNP/one LSP in cases where we have a burst. > > > > > > LANs are a more difficult problem than P2P - and thus far = draft-ginsberg-lsr- > > isis-flooding-scale has been silent on this - but not because we = aren't aware > > of this - just have focused on the P2P behavior first. > > > What the best behavior on a LAN may be is something I am still = considering. > > Slowing flooding down to the speed at which the slowest IS on the = LAN can > > support may not be the best strategy - as it also slows down the = propagation > > rate for systems downstream from the nodes on the LAN which can = handle > > faster flooding - thereby having an impact on flooding speed = throughout the > > network in a way which may be out of proportion. This is a smaller = example > > of the larger issue that when only some nodes in the network support = faster > > flooding the behavior of the whole network may not be "better" when = faster > > flooding is enabled because it prolongs the period of LSDB = inconsistency. > > More work needs to be done here... > > > > > > In summary, I don't expect to have to "reinvent TCP" - but I do = think you > > have provided a useful perspective for us to consider as we progress = on this > > topic, > > > > > > Thanx. > > > > > > Les > > > > > > > > > > -----Original Message----- > > > > From: Lsr On Behalf Of Henk Smit > > > > Sent: Thursday, April 30, 2020 6:58 AM > > > > To: lsr@ietf.org > > > > Subject: [Lsr] Why only a congestion-avoidance algorithm on the = sender > > isn't > > > > enough > > > > > > > > > > > > Hello all, > > > > > > > > Two years ago, Gunter Van de Velde and myself published this = draft: > > > > = https://tools.ietf.org/html/draft-hsmit-lsr-isis-flooding-over-tcp-00 > > > > That started this discussion about flow/congestion control and = ISIS > > > > flooding. > > > > > > > > My thoughts were that once we start implementing new algorithms = to > > > > optimize ISIS flooding speed, we'll end up with our own version = of TCP. > > > > I think most people here have a good general understanding of = TCP. > > > > But if not, this is a good overview how TCP does it: > > > > https://en.wikipedia.org/wiki/TCP_congestion_control > > > > > > > > > > > > What does TCP do: > > > > =3D=3D=3D=3D > > > > TCP does 2 things: flow control and congestion control. > > > > > > > > 1) Flow control is: the receiver trying to prevent itself from = being > > > > overloaded. The receiver indicates, through the = receiver-window-size > > > > in the TCP acks, how much data it can or wants to receive. > > > > 2) Congestion control is: the sender trying to prevent the links = between > > > > sender and receiver from being overloaded. The sender makes an > > educated > > > > guess at what speed it can send. > > > > > > > > > > > > The part we seem to be missing: > > > > =3D=3D=3D=3D > > > > For the sender to make a guess at what speed it can send, it = looks at > > > > how the transmission is behaving. Are there drops ? What is the = RTT ? > > > > Do drop-percentage and RTT change ? Do acks come in at the same = rate > > > > as the sender sends segments ? Are there duplicate acks ? To be = able > > > > to do this, the sender must know what to expect. How acks = behave. > > > > > > > > If you want an ISIS sender to make a guess at what speed it can = send, > > > > without changing the protocol, the only thing the sender can do = is look > > > > at the PSNPs that come back from the receiver. But the RTT of = PSNPs can > > > > not be predicted. Because a good ISIS implementation does not > > > > immediately > > > > send a PSNP when it receives a LSP. 1) the receiver should = jitter the > > > > PSNP, > > > > like it should jitter all packets. And 2) the receiver should = wait a > > > > little > > > > to see if it can combine multiple acks into a single PSNP = packet. > > > > > > > > In TCP, if a single segment gets lost, each new segment will = cause the > > > > receiver to send an ack with the seqnr of the last received = byte. This > > > > is called "duplicate acks". This triggers the sender to do > > > > fast-retransmission. In ISIS, this can't be be done. The = information > > > > a sender can get from looking at incoming PSNPs is a lot less = than what > > > > TCP can learn from incoming acks. > > > > > > > > > > > > The problem with sender-side congestion control: > > > > =3D=3D=3D=3D > > > > In ISIS, all we know is that the default retransmit-interval is = 5 > > > > seconds. > > > > And I think most implementations use that as the default. This = means > > > > that > > > > the receiver of an LSP has one requirement: send a PSNP within 5 > > > > seconds. > > > > For the rest, implementations are free to send PSNPs however and > > > > whenever > > > > they want. This means a sender can not really make conclusions = about > > > > flooding speed, dropped LSPs, capacity of the receiver, etc. > > > > There is no ordering when flooding LSPs, or sending PSNPs. This = makes > > > > a sender-side algorithm for ISIS a lot harder. > > > > > > > > When you think about it, you realize that a sender should wait = the > > > > full 5 seconds before it can make any real conclusions about = dropped > > > > LSPs. > > > > If a sender looks at PSNPs to determine its flooding speed, it = will > > > > probably > > > > not be able to react without a delay of a few seconds. A sender = might > > > > send > > > > hunderds or thousands of LSPs in those 5 seconds, which might = all or > > > > partially be dropped, complicating matters even further. > > > > > > > > > > > > A sender-sider algorithm should specify how to do PSNPs. > > > > =3D=3D=3D=3D > > > > So imho a sender-side only algorithm can't work just like that = in a > > > > multi-vendor environment. We must not only specify a congestion- > > control > > > > algorithm for the sender. We must also specify for the receiver = a more > > > > specific algorithm how and when to send PSNPs. At least how to = do > > PSNPs > > > > under load. > > > > > > > > Note that this might result in the receiver sending more (and = smaller) > > > > PSNPs. > > > > More packets might mean more congestion (inside routers). > > > > > > > > > > > > Will receiver-side flow-control work ? > > > > =3D=3D=3D=3D > > > > I don't know if that's enough. It will certainly help. > > > > > > > > I think to tackle this problem, we need 3 parts: > > > > 1) sender-side congestion-control algorithm > > > > 2) more detailed algorithm on receiver when and how to send = PSNPs > > > > 3) receiver-side flow-control mechanism > > > > > > > > As discussed at length, I don't know if the ISIS process on the > > > > receiving > > > > router can actually know if its running out of resources = (buffers on > > > > interfaces, linecards, etc). That's implementation dependent. A = receiver > > > > can definitely advertise a fixed value. So the sender has an = upper bound > > > > to use when doing congestion-control. Just like TCP has both a > > > > flow-control > > > > window and a congestion-control window, and a sender uses both. > > Maybe > > > > the > > > > receiver can even advertise a dynamic value. Maybe now, maybe = only in > > > > the > > > > future. An advertised upper limit seems useful to me today. > > > > > > > > > > > > What I didn't like about our own proposal (flooding over TCP): > > > > =3D=3D=3D=3D > > > > The problem I saw with flooding over TCP concerns multi-point = networks > > > > (LANs). > > > > > > > > When flooding over a multi-point network, setting up TCP = connections > > > > introduces serious challenges. Who are the endpoints of the TCP > > > > connections ? > > > > Full mesh ? Or do all ISes on a LAN create a TCP-connection to = the DIS ? > > > > There is no backup DIS in ISIS (unlike OSPF). Things get messy = quickly. > > > > > > > > However, the other two proposals do not solve this problem = either. > > > > How will a sender-side congestion-avoidence algorithm determine > > whether > > > > there were drops ? There are no acks (PSNPs) on a LAN. We assume = most > > > > LSPs > > > > that are broadcasted are received by all other ISes on the LAN. = There > > > > are > > > > no acks. Only after the DIS has sent its periodic CSNPs, ISes = can send > > > > PSNPs to request retransmissions. It seems impossible (or very = hard) to > > > > me for all ISes on a LAN to keep track of dropped LSPs and = adjust their > > > > sending speed accordingly.. > > > > > > > > When flooding on a LAN, the receiver-side algorithm seems best. > > Because > > > > all ISes can see what the lowest advertised sending-speed is. = And make > > > > sure they send slow enough to not overload the slowest IS. I'm = not sure > > > > this is a good solution, but is seems easier and more realistic = than > > > > ISIS-flooding-over-TCP or sender-side congestion-avoidance. > > > > > > > > > > > > My conclusion: > > > > =3D=3D=3D=3D > > > > Sender-side congestion-control won't work without specifying in = more > > > > detail how and when to send PSNPs. > > > > Receiver-side flow-control will certainly help. I dont' know if = it's > > > > good enough. I don't know if advertising a static value is good = enough. > > > > But it's a start. > > > > > > > > I still think we'll end up re-implementing a new (and weaker) = TCP. > > > > > > > > > > > > henk. > > > > > > > > _______________________________________________ > > > > Lsr mailing list > > > > Lsr@ietf.org > > > > https://www.ietf.org/mailman/listinfo/lsr > > > > > > _______________________________________________ > > > Lsr mailing list > > > Lsr@ietf.org > > > https://www.ietf.org/mailman/listinfo/lsr > > > > __________________________________________________________ > > __________________________________________________________ > > _____ > > > > Ce message et ses pieces jointes peuvent contenir des informations > > confidentielles ou privilegiees et ne doivent donc > > pas etre diffuses, exploites ou copies sans autorisation. Si vous = avez recu ce > > message par erreur, veuillez le signaler > > a l'expediteur et le detruire ainsi que les pieces jointes. Les = messages > > electroniques etant susceptibles d'alteration, > > Orange decline toute responsabilite si ce message a ete altere, = deforme ou > > falsifie. Merci. > > > > This message and its attachments may contain confidential or = privileged > > information that may be protected by law; > > they should not be distributed, used or copied without = authorisation. > > If you have received this email in error, please notify the sender = and delete > > this message and its attachments. > > As emails may be altered, Orange is not liable for messages that = have been > > modified, changed or falsified. > > Thank you. > =20 > = __________________________________________________________________________= _______________________________________________ > =20 > Ce message et ses pieces jointes peuvent contenir des informations = confidentielles ou privilegiees et ne doivent donc > pas etre diffuses, exploites ou copies sans autorisation. Si vous avez = recu ce message par erreur, veuillez le signaler > a l'expediteur et le detruire ainsi que les pieces jointes. Les = messages electroniques etant susceptibles d'alteration, > Orange decline toute responsabilite si ce message a ete altere, = deforme ou falsifie. Merci. > =20 > This message and its attachments may contain confidential or = privileged information that may be protected by law; > they should not be distributed, used or copied without authorisation. > If you have received this email in error, please notify the sender and = delete this message and its attachments. > As emails may be altered, Orange is not liable for messages that have = been modified, changed or falsified. > Thank you. > = __________________________________________________________________________= _______________________________________________ >=20 > Ce message et ses pieces jointes peuvent contenir des informations = confidentielles ou privilegiees et ne doivent donc > pas etre diffuses, exploites ou copies sans autorisation. Si vous avez = recu ce message par erreur, veuillez le signaler > a l'expediteur et le detruire ainsi que les pieces jointes. Les = messages electroniques etant susceptibles d'alteration, > Orange decline toute responsabilite si ce message a ete altere, = deforme ou falsifie. 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boundary="_000_MW3PR11MB4619C956E9BD70B295E788D2C1A40MW3PR11MB4619namp_" MIME-Version: 1.0 X-MS-Exchange-CrossTenant-Network-Message-Id: a2c92382-cc17-4bb3-b750-08d7f1cd06ee X-MS-Exchange-CrossTenant-originalarrivaltime: 06 May 2020 14:51:58.2509 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 5ae1af62-9505-4097-a69a-c1553ef7840e X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: jIGVAOn3lrw1M4Qe+bSS+SivgjiDorXoshRvkQfIhma7WLG9Zdi/xia9dhy1OEmKKTp4DA0N4yB82I/lzPEIHA== X-MS-Exchange-Transport-CrossTenantHeadersStamped: MW3PR11MB4649 X-OriginatorOrg: cisco.com X-Outbound-SMTP-Client: 173.37.102.12, xch-rcd-002.cisco.com X-Outbound-Node: alln-core-9.cisco.com Archived-At: Subject: Re: [Lsr] Flooding across a network X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 06 May 2020 14:52:09 -0000 --_000_MW3PR11MB4619C956E9BD70B295E788D2C1A40MW3PR11MB4619namp_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Bruno - The key in this example is when all nodes in the network realize that there= are no longer any northbound paths via C. I am willing to stipulate that nodes that can receive LSPs faster will also= be able to flood LSPs faster. If that isn't the case we might as well all = stop working on faster flooding. In the example, all nodes other than D will have reconverged to a topology = with no northbound paths via C in time (2 seconds + network propagation tim= e + FIB update time). How long would you like to allow for this? 10 seconds? 15 seconds? That still leaves Node D in an inconsistent state for 35+ seconds where it = thinks there are still Northbound paths via C. If all nodes support the same flooding rate (faster or slower) they will al= l reach an LSDB state where there are no Northbound paths via C within a fe= w seconds of each other. So - yes - there can still be loops even with consistent flooding rates - b= ut they will be an order of magnitude shorter (a few seconds vs 50 seconds = in the example). Les From: Lsr On Behalf Of bruno.decraene@orange.com Sent: Wednesday, May 06, 2020 7:33 AM To: Les Ginsberg (ginsberg) Cc: lsr@ietf.org Subject: Re: [Lsr] Flooding across a network Les, From: Les Ginsberg (ginsberg) [mailto:ginsberg@cisco.com] Sent: Wednesday, May 6, 2020 4:14 PM To: DECRAENE Bruno TGI/OLN Cc: lsr@ietf.org Subject: RE: Flooding across a network Bruno - I am somewhat at a loss to understand your comments. The example is straightforward and does not need to consider FIB update tim= e nor the ordering of prefix updates on different nodes. [Bruno] The example is straightforward but you are referring to FIB and IP = packets forwarding as per those FIBs. I'd like we focus on LSP flooding and LSDB consistency. Consider the state of Node B and Node D at various time points from the tri= gger event. T+ 2 seconds: ----------------- B has received all LSP Updates. It triggers an SPF and for all Northbound d= estinations previously reachable via C it installs paths via D. Let's assume it take 5 seconds to update the forwarding plane. D has received 40 of the 1000 LSP updates. It triggers an SPF and finds tha= t all Northbound destinations are reachable via B-C. It makes no changes to= the forwarding plane. T+7 seconds ----------------- B has completed FIB updates. Traffic to all Northbound destinations is bein= g forwarded via D. D has now received 140 of the 1000 LSP updates. Entries in its forwarding p= lane for Northbound destinations still point to B. We have a loop. T + 30 seconds -------------------- D has now received 600 of the 1000 LSP updates. Still no changes to its for= warding plane. Traffic to Northbound destinations is still looping. T+ 50 seconds ------------------- D has finally received all 1000 LSP updates.. It triggers (another) SPF and calculates paths to Northbound destinations v= ia E. It begins to update its forwarding plane. Let's assume this will take 5 seconds.. T + 55 seconds -------------------- D has completed forwarding plane updates - no more looping. That is all I am trying to illustrate. If you want to start arguing that node protecting LFAs + microloop avoidanc= e could help (NOTE I explicitly took those out of the example for simplici= ty) - it is easy enough to change the example to include multiple node fail= ures or a node failure plus some northbound link failures on other nodes. [Bruno] I'm not talking about LFA/FRR. And with regards to microloops avoid= ance, some algorithms can handle any graph transition so including multiple= node failures. But again, let's stick to LSP flooding and LSDB consistency. (you are the o= ne speaking about microloops in the forwarding plane). The point here is to look at the impact of long-lived LSDB inconsistency wh= ich results when some nodes support flooding an order of magnitude faster f= looding than other nodes - which is what you asked me to clarify. [Bruno] No. I asked you to clarify why having a node with faster flooding c= ould prolongs the period of LSDB inconsistency. Again, with you own words: "when only some nodes in the network support fas= ter flooding the behavior of the whole network may not be "better" when fas= ter flooding is enabled because it prolongs the period of LSDB inconsistenc= y." And with less words: "when only some nodes in the network support faster fl= ooding [...] it prolongs the period of LSDB inconsistency." --Bruno Les From: bruno.decraene@orange.com > Sent: Wednesday, May 06, 2020 6:21 AM To: Les Ginsberg (ginsberg) > Cc: lsr@ietf.org Subject: RE: Flooding across a network Les, From: Les Ginsberg (ginsberg) [mailto:ginsberg@cisco.com] Sent: Wednesday, May 6, 2020 1:35 AM To: DECRAENE Bruno TGI/OLN; lsr@ietf..org Subject: RE: Flooding across a network Bruno - Seems like it was not too long ago that we were discussing this in person. = Ahhh...the good old days... [Bruno] Indeed, may be not to the point of concluding. Indeed. First, let's agree that the interesting case does not involve 1 or even a s= mall number of LSPs. For those cases flooding speed does not matter. The interesting cases involve a large number of LSPs (hundreds or thousands= ). And in such cases LFA/microloop avoidance techniques are not applicable. Take the following simple topology: | | ... | | +---+ +---+ | C | | E | +---+ +---+ | | 1000 +---+ +---+ | B |-------------| D | +---+ 1000 +---+ | | | | \ / \ / \ / \ / +---+ | A | +---+ There is a topology northbound of C and E (not shown) and a topology southb= ound of A (not shown). Cost on all links is 10 except B-D and D-E where cost is high. C is a node with 1000 neighbors. When all links are up, shortest path for all northbound destinations is via= C. All nodes in the network support fast flooding except for Node D. Let's say fast flooding is 500 LSPs/second and slow flooding (Node D) is 20= LSPs/seconds. If Node C fails we have 1000 LSPs to flood. All nodes except for D can receive these in 2 seconds (plus internode delay= time). D can receive LSPs in 50 seconds. [Bruno] Thanks for your example. Agreed so far. When A and B and all southbound nodes receive/process the LSP updates they = will start sending traffic to Northbound destinations via D. But for the better part of 50 seconds, Node D has yet to receive all LSP up= dates and still believes that shortest path is via B-C. It will loop traffi= c. [Bruno] May I remind you that we are discussing IS-IS flooding in order to = sync LSDB (LSP database). That is already a big enough subject. It does not= including FIB (updates), nor IP forwarding. Quoting you "when only some nodes in the network support faster flooding th= e behavior of the whole network may not be "better" when faster flooding is= enabled because it prolongs the period of LSDB inconsistency." Taking your own examples, in both cases (all nodes support fast flooding; a= ll nodes but D support fast flooding) the period of LSDB inconsistency is 5= 0 seconds. Hence this example does not illustrate your statement. Hence I'm restating my questions: > > when only some nodes in the network support faster flooding the behavio= r > of the whole network may not be "better" when faster flooding is enabled > because it prolongs the period of LSDB inconsistency. > > 1) Do you have data on this? > > 2) If not, can you provide an example where increasing the flooding rate = on > one adjacency prolongs the period of LSDB inconsistency across the > network? Had all nodes used slow flooding, it still would have taken 50 seconds to c= onverge, but there would be significantly less looping. There could be a go= od amount of blackholing, but this is preferable to looping. [Bruno] You are using an example where ordering FIB updates across the netw= ork, e.g. as per [1], allows to reduce _FIB_ inconsistency across the path/= network. And you seem to conclude from this that this translates to LSDB up= date ordering. Those are two different things. In this thread, I'd suggest = that we focus on IGP flooding and LSDB sync only. (*) [1] https://tools.ietf.org/html/rfc6976 (*) We can discuss loop free IGP converge in a different thread if you want= . IMO, the use of segment routing/source routing is better than oFIB. But a= t some point, it still relies on fast flooding when multiple LSPs are invol= ved. (and I mean _fast_ not _ordered_) --Bruno One can always come up with examples - based on a specific topology and a s= pecific failure - where things might be better/worse/unchanged in the face = of inconsistent flooding speed support. But I hope this simple example illustrates the pitfalls. Les > -----Original Message----- > From: bruno.decraene@orange.com > > Sent: Tuesday, May 05, 2020 8:28 AM > To: Les Ginsberg (ginsberg) >; lsr@ietf.org > Subject: Flooding across a network > > Les, > > > From: Lsr [mailto:lsr-bounces@ietf.org] On Behalf Of Les Ginsberg > (ginsberg) > > Sent: Monday, May 4, 2020 4:39 PM > [...] > > when only some nodes in the network support faster flooding the behavio= r > of the whole network may not be "better" when faster flooding is enabled > because it prolongs the period of LSDB inconsistency. > > 1) Do you have data on this? > > 2) If not, can you provide an example where increasing the flooding rate = on > one adjacency prolongs the period of LSDB inconsistency across the > network? > > 3) In the meantime, let's try the theoretical analysis on a simple scenar= io > where a single LSP needs to be flooded across the network. > > - Let's call Dij the time needed to flood the LSP from node i to the adja= cent > node j. Clearly Dij>0. > - Let's call k the node originating this LSP at t0=3D0s > > >From t0, the LSDB is inconsistent across the network as all nodes but k = are > missing the LSP and hence only know about the 'old' topology. > > Let's call SPT(k) the SPT rooted on k, using Dij as the metric between > adjacent nodes i and j. Let's call SP(k,i) the shortest path from k to i;= and > D(k,i) the shortest distance between k and i. > > It seems that the time needed: > - for node j to learn about the LSP, and get in sync with k, is D(k,j) > - for all nodes across the network to learn about the LSP, and get in syn= c with > k, is Max[for all j] D(k,j) > > Then how can reducing the flooding delay on one adjacency could prolongs > the period of LSDB inconsistency? > It seems to me that it can only improve/decrease it. Otherwise, this woul= d > mean that decreasing the cost on a link can increase the cost of the shor= test > path. > > Note: I agree that there are other cases, such as multiple LSPs originat= ed by > the same node, and multiple LSPs originated by multiple nodes, but let's = start > with the simple case. > > Thanks, > --Bruno > > > -----Original Message----- > > From: Lsr [mailto:lsr-bounces@ietf.org] On Behalf Of Les Ginsberg > (ginsberg) > > Sent: Monday, May 4, 2020 4:39 PM > > > > Henk - > > > > Thanx for your thoughtful posts. > > I have read your later posts on this thread as well - but decided to re= ply to > this one. > > Top posting for better readability. > > > > There is broad agreement that faster flooding is desirable. > > There are now two proposals as to how to address the issue - neither of > which is proposing to use TCP (or equivalent). > > > > I have commented on why IS-IS flooding requirements are significantly > different than that for which TCP is used. > > I think it is also useful to note that even the simple test case which = Bruno > reported on in last week's interim meeting demonstrated that without any > changes to the protocol at all IS-IS was able to flood an order of magnit= ude > faster than it commonly does today. > > This gives me hope that we are looking at the problem correctly and wil= l not > need "TCP". > > > > Introducing a TCP based solution requires: > > > > a)A major change to the adjacency formation logic > > > > b)Removal of the independence of the IS-IS protocol from the address > families whose reachability advertisements it supports - something which = I > think is a great strength of the protocol - particularly in environments = where > multiple address family support is needed > > > > I really don't want to do either of the above. > > > > Your comments regarding PSNP response times are quite correct - and > both of the draft proposals discuss this - though I agree more detail wil= l be > required. > > It is intuitive that if you want to flood faster you also need to ACK f= aster - > and probably even retransmit faster when that is needed. > > The basic relationship between retransmit interval and PSNP interval is > expressed in ISO 10589: > > > > " partialSNPInterval - This is the amount of time between periodic > > action for transmission of Partial Sequence Number PDUs. > > It shall be less than minimumLSPTransmission-Interval." > > > > Of course ISO 10589 recommended values (2 seconds and 5 seconds > respectively) associated with a much slower flooding rate and > implementations I am aware of use values in this order of magnitude. Thes= e > numbers need to be reduced if we are to flood faster, but the relationshi= p > between the two needs to remain the same. > > > > It is also true - as you state - that sending ACKs more quickly will re= sult in > additional PDUs which need to be received/processed by IS-IS - and this h= as > some impact. But I think it is reasonable to expect that an implementatio= n > which can support sending and receiving LSPs at a faster rate should also= be > able to send/receive PSNPs at a faster rate. But we still need to be smar= ter > than sending one PSNP/one LSP in cases where we have a burst. > > > > LANs are a more difficult problem than P2P - and thus far draft-ginsber= g-lsr- > isis-flooding-scale has been silent on this - but not because we aren't a= ware > of this - just have focused on the P2P behavior first. > > What the best behavior on a LAN may be is something I am still consider= ing. > Slowing flooding down to the speed at which the slowest IS on the LAN can > support may not be the best strategy - as it also slows down the propagat= ion > rate for systems downstream from the nodes on the LAN which can handle > faster flooding - thereby having an impact on flooding speed throughout t= he > network in a way which may be out of proportion. This is a smaller exampl= e > of the larger issue that when only some nodes in the network support fast= er > flooding the behavior of the whole network may not be "better" when faste= r > flooding is enabled because it prolongs the period of LSDB inconsistency. > More work needs to be done here... > > > > In summary, I don't expect to have to "reinvent TCP" - but I do think y= ou > have provided a useful perspective for us to consider as we progress on t= his > topic, > > > > Thanx. > > > > Les > > > > > > > -----Original Message----- > > > From: Lsr > On Beha= lf Of Henk Smit > > > Sent: Thursday, April 30, 2020 6:58 AM > > > To: lsr@ietf.org > > > Subject: [Lsr] Why only a congestion-avoidance algorithm on the sende= r > isn't > > > enough > > > > > > > > > Hello all, > > > > > > Two years ago, Gunter Van de Velde and myself published this draft: > > > https://tools.ietf.org/html/draft-hsmit-lsr-isis-flooding-over-tcp-00 > > > That started this discussion about flow/congestion control and ISIS > > > flooding. > > > > > > My thoughts were that once we start implementing new algorithms to > > > optimize ISIS flooding speed, we'll end up with our own version of TC= P. > > > I think most people here have a good general understanding of TCP. > > > But if not, this is a good overview how TCP does it: > > > https://en.wikipedia.org/wiki/TCP_congestion_control > > > > > > > > > What does TCP do: > > > =3D=3D=3D=3D > > > TCP does 2 things: flow control and congestion control. > > > > > > 1) Flow control is: the receiver trying to prevent itself from being > > > overloaded. The receiver indicates, through the receiver-window-size > > > in the TCP acks, how much data it can or wants to receive. > > > 2) Congestion control is: the sender trying to prevent the links betw= een > > > sender and receiver from being overloaded. The sender makes an > educated > > > guess at what speed it can send. > > > > > > > > > The part we seem to be missing: > > > =3D=3D=3D=3D > > > For the sender to make a guess at what speed it can send, it looks at > > > how the transmission is behaving. Are there drops ? What is the RTT ? > > > Do drop-percentage and RTT change ? Do acks come in at the same rate > > > as the sender sends segments ? Are there duplicate acks ? To be able > > > to do this, the sender must know what to expect. How acks behave. > > > > > > If you want an ISIS sender to make a guess at what speed it can send, > > > without changing the protocol, the only thing the sender can do is lo= ok > > > at the PSNPs that come back from the receiver. But the RTT of PSNPs c= an > > > not be predicted. Because a good ISIS implementation does not > > > immediately > > > send a PSNP when it receives a LSP. 1) the receiver should jitter the > > > PSNP, > > > like it should jitter all packets. And 2) the receiver should wait a > > > little > > > to see if it can combine multiple acks into a single PSNP packet. > > > > > > In TCP, if a single segment gets lost, each new segment will cause th= e > > > receiver to send an ack with the seqnr of the last received byte. Thi= s > > > is called "duplicate acks". This triggers the sender to do > > > fast-retransmission. In ISIS, this can't be be done. The information > > > a sender can get from looking at incoming PSNPs is a lot less than wh= at > > > TCP can learn from incoming acks. > > > > > > > > > The problem with sender-side congestion control: > > > =3D=3D=3D=3D > > > In ISIS, all we know is that the default retransmit-interval is 5 > > > seconds. > > > And I think most implementations use that as the default. This means > > > that > > > the receiver of an LSP has one requirement: send a PSNP within 5 > > > seconds. > > > For the rest, implementations are free to send PSNPs however and > > > whenever > > > they want. This means a sender can not really make conclusions about > > > flooding speed, dropped LSPs, capacity of the receiver, etc. > > > There is no ordering when flooding LSPs, or sending PSNPs. This makes > > > a sender-side algorithm for ISIS a lot harder. > > > > > > When you think about it, you realize that a sender should wait the > > > full 5 seconds before it can make any real conclusions about dropped > > > LSPs. > > > If a sender looks at PSNPs to determine its flooding speed, it will > > > probably > > > not be able to react without a delay of a few seconds. A sender might > > > send > > > hunderds or thousands of LSPs in those 5 seconds, which might all or > > > partially be dropped, complicating matters even further. > > > > > > > > > A sender-sider algorithm should specify how to do PSNPs. > > > =3D=3D=3D=3D > > > So imho a sender-side only algorithm can't work just like that in a > > > multi-vendor environment. We must not only specify a congestion- > control > > > algorithm for the sender. We must also specify for the receiver a mor= e > > > specific algorithm how and when to send PSNPs. At least how to do > PSNPs > > > under load. > > > > > > Note that this might result in the receiver sending more (and smaller= ) > > > PSNPs. > > > More packets might mean more congestion (inside routers). > > > > > > > > > Will receiver-side flow-control work ? > > > =3D=3D=3D=3D > > > I don't know if that's enough. It will certainly help. > > > > > > I think to tackle this problem, we need 3 parts: > > > 1) sender-side congestion-control algorithm > > > 2) more detailed algorithm on receiver when and how to send PSNPs > > > 3) receiver-side flow-control mechanism > > > > > > As discussed at length, I don't know if the ISIS process on the > > > receiving > > > router can actually know if its running out of resources (buffers on > > > interfaces, linecards, etc). That's implementation dependent. A recei= ver > > > can definitely advertise a fixed value. So the sender has an upper bo= und > > > to use when doing congestion-control. Just like TCP has both a > > > flow-control > > > window and a congestion-control window, and a sender uses both. > Maybe > > > the > > > receiver can even advertise a dynamic value. Maybe now, maybe only in > > > the > > > future. An advertised upper limit seems useful to me today. > > > > > > > > > What I didn't like about our own proposal (flooding over TCP): > > > =3D=3D=3D=3D > > > The problem I saw with flooding over TCP concerns multi-point network= s > > > (LANs). > > > > > > When flooding over a multi-point network, setting up TCP connections > > > introduces serious challenges. Who are the endpoints of the TCP > > > connections ? > > > Full mesh ? Or do all ISes on a LAN create a TCP-connection to the DI= S ? > > > There is no backup DIS in ISIS (unlike OSPF). Things get messy quickl= y. > > > > > > However, the other two proposals do not solve this problem either. > > > How will a sender-side congestion-avoidence algorithm determine > whether > > > there were drops ? There are no acks (PSNPs) on a LAN. We assume most > > > LSPs > > > that are broadcasted are received by all other ISes on the LAN. There > > > are > > > no acks. Only after the DIS has sent its periodic CSNPs, ISes can sen= d > > > PSNPs to request retransmissions. It seems impossible (or very hard) = to > > > me for all ISes on a LAN to keep track of dropped LSPs and adjust the= ir > > > sending speed accordingly.. > > > > > > When flooding on a LAN, the receiver-side algorithm seems best. > Because > > > all ISes can see what the lowest advertised sending-speed is. And mak= e > > > sure they send slow enough to not overload the slowest IS. I'm not su= re > > > this is a good solution, but is seems easier and more realistic than > > > ISIS-flooding-over-TCP or sender-side congestion-avoidance. > > > > > > > > > My conclusion: > > > =3D=3D=3D=3D > > > Sender-side congestion-control won't work without specifying in more > > > detail how and when to send PSNPs. > > > Receiver-side flow-control will certainly help. I dont' know if it's > > > good enough. I don't know if advertising a static value is good enoug= h. > > > But it's a start. > > > > > > I still think we'll end up re-implementing a new (and weaker) TCP. > > > > > > > > > henk. > > > > > > _______________________________________________ > > > Lsr mailing list > > > Lsr@ietf.org > > > https://www.ietf.org/mailman/listinfo/lsr > > > > _______________________________________________ > > Lsr mailing list > > Lsr@ietf.org > > https://www.ietf.org/mailman/listinfo/lsr > > __________________________________________________________ > __________________________________________________________ > _____ > > Ce message et ses pieces jointes peuvent contenir des informations > confidentielles ou privilegiees et ne doivent donc > pas etre diffuses, exploites ou copies sans autorisation. Si vous avez re= cu ce > message par erreur, veuillez le signaler > a l'expediteur et le detruire ainsi que les pieces jointes. Les messages > electroniques etant susceptibles d'alteration, > Orange decline toute responsabilite si ce message a ete altere, deforme o= u > falsifie. Merci. > > This message and its attachments may contain confidential or privileged > information that may be protected by law; > they should not be distributed, used or copied without authorisation. > If you have received this email in error, please notify the sender and de= lete > this message and its attachments. > As emails may be altered, Orange is not liable for messages that have bee= n > modified, changed or falsified. > Thank you. ___________________________________________________________________________= ______________________________________________ Ce message et ses pieces jointes peuvent contenir des informations confiden= tielles ou privilegiees et ne doivent donc pas etre diffuses, exploites ou copies sans autorisation. Si vous avez recu= ce message par erreur, veuillez le signaler a l'expediteur et le detruire ainsi que les pieces jointes. Les messages el= ectroniques etant susceptibles d'alteration, Orange decline toute responsabilite si ce message a ete altere, deforme ou = falsifie. Merci. This message and its attachments may contain confidential or privileged inf= ormation that may be protected by law; they should not be distributed, used or copied without authorisation. If you have received this email in error, please notify the sender and dele= te this message and its attachments. As emails may be altered, Orange is not liable for messages that have been = modified, changed or falsified. Thank you. ___________________________________________________________________________= ______________________________________________ Ce message et ses pieces jointes peuvent contenir des informations confiden= tielles ou privilegiees et ne doivent donc pas etre diffuses, exploites ou copies sans autorisation. Si vous avez recu= ce message par erreur, veuillez le signaler a l'expediteur et le detruire ainsi que les pieces jointes. Les messages el= ectroniques etant susceptibles d'alteration, Orange decline toute responsabilite si ce message a ete altere, deforme ou = falsifie. Merci. This message and its attachments may contain confidential or privileged inf= ormation that may be protected by law; they should not be distributed, used or copied without authorisation. If you have received this email in error, please notify the sender and dele= te this message and its attachments. As emails may be altered, Orange is not liable for messages that have been = modified, changed or falsified. Thank you. --_000_MW3PR11MB4619C956E9BD70B295E788D2C1A40MW3PR11MB4619namp_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Bruno –

 

The key in this example is when all nodes in the net= work realize that there are no longer any northbound paths via C.

I am willing to stipulate that nodes that can receiv= e LSPs faster will also be able to flood LSPs faster. If that isn’t t= he case we might as well all stop working on faster flooding.

 

In the example, all nodes other than D will have rec= onverged to a topology with no northbound paths via C in time (2 seconds &#= 43; network propagation time + FIB update time).

How long would you like to allow for this? 10 second= s? 15 seconds?

That still leaves Node D in an inconsistent state fo= r 35+ seconds where it thinks there are still Northbound paths via C.

 

If all nodes support the same flooding rate (faster = or slower) they will all reach an LSDB state where there are no Northbound = paths via C within a few seconds of each other.

So – yes – there can still be loops even= with consistent flooding rates – but they will be an order of magnit= ude shorter (a few seconds vs 50 seconds in the example).

 

  Les

 

 

From: Lsr <lsr-bounces@ietf.org> On = Behalf Of bruno.decraene@orange.com
Sent: Wednesday, May 06, 2020 7:33 AM
To: Les Ginsberg (ginsberg) <ginsberg@cisco.com>
Cc: lsr@ietf.org
Subject: Re: [Lsr] Flooding across a network

 

Les,<= /o:p>

 = ;

From: Les Ginsberg (ginsberg) [mailto:ginsberg@cisco.com]
Sent: Wednesday, May 6, 2020 4:14 PM
To: DECRAENE Bruno TGI/OLN
Cc: lsr@ietf.org
Subject: RE: Flooding across a network

=  

Bruno –

 

I am somewhat at a loss= to understand your comments.

The example is straight= forward and does not need to consider FIB update time nor the ordering of p= refix updates on different nodes.

[Bruno] The example is= straightforward but you are referring to FIB and IP packets forwarding as = per those FIBs.

I’d like we focu= s on LSP flooding and LSDB consistency.

 

Consider the state of N= ode B and Node D at various time points from the trigger event.<= /p>

 

T+ 2 seconds:<= /o:p>

-----------------<= /o:p>

B has received all LSP = Updates. It triggers an SPF and for all Northbound destinations previously = reachable via C it installs paths via D.

Let’s assume it t= ake 5 seconds to update the forwarding plane.

 

D has received 40 of th= e 1000 LSP updates. It triggers an SPF and finds that all Northbound destin= ations are reachable via B-C. It makes no changes to the forwarding plane.<= o:p>

 

T+7 seconds

-----------------<= /o:p>

B has completed FIB upd= ates. Traffic to all Northbound destinations is being forwarded via D.=

 

D has now received 140 = of the 1000 LSP updates. Entries in its forwarding plane for Northbound des= tinations still point to B.

 

We have a loop.

 

T + 30 seconds=

--------------------

D has now received 600 = of the 1000 LSP updates. Still no changes to its forwarding plane.

Traffic to Northbound d= estinations is still looping.

 

T+ 50 seconds<= /o:p>

-------------------

D has finally received = all 1000 LSP updates..

It triggers (another) S= PF and calculates paths to Northbound destinations via E. It begins to upda= te its forwarding plane.

Let’s assume this= will take 5 seconds..

 

T + 55 seconds=

--------------------

D has completed forward= ing plane updates – no more looping.

 

That is all I am trying= to illustrate.

 

If you want to start ar= guing that node protecting LFAs + microloop avoidance could help (NOTE = I explicitly  took those out of the example for simplicity) – it= is easy enough to change the example to include multiple node failures or a node failure plus some northbound link failures on othe= r nodes.

[Bruno] I’m not = talking about LFA/FRR. And with regards to microloops avoidance, some algor= ithms can handle any graph transition so including multiple node failures.<= o:p>

 

But again, let’s= stick to LSP flooding and LSDB consistency. (you are the one speaking abou= t microloops in the forwarding plane).

 

The point here is to lo= ok at the impact of long-lived LSDB inconsistency which results when some n= odes support flooding an order of magnitude faster flooding than other node= s – which is what you asked me to clarify.

[Bruno] No. I asked yo= u to clarify why having a node with faster flooding could prolongs the period of LSDB inconsiste= ncy.

 

Again, with you own wo= rds: “when only some nodes in the network support faster flooding the= behavior of the whole network may not be "better" when faster fl= ooding is enabled because it prolongs the period of LSDB inconsistency.”

And with less words: &= #8220;when only some nodes in the network support faster flooding […]=   it prolongs the period of LSDB inconsistency.”

 

--Bruno

 

   Les

 

 

 

From: bruno.decraene@orange.com <bruno.decraene@orange.com>
Sent: Wednesday, May 06, 2020 6:21 AM
To: Les Ginsberg (ginsberg) <ginsberg@cisco.com>
Cc: lsr@ietf.org
Subject: RE: Flooding across a network

 

Les,

 

From: Les Ginsberg (ginsberg) [mailto:ginsberg@cisco.com]
Sent: Wednesday, May 6, 2020 1:35 AM
To: DECRAENE Bruno TGI/OLN; lsr@ietf= ..org
Subject: RE: Flooding across a network

=  

Bruno -

 

Seems like it was no= t too long ago that we were discussing this in person.  Ahhh...the goo= d old days...

[Bruno] Indeed, may be not to the point of concluding. Indeed.

 

First, let's agree t= hat the interesting case does not involve 1 or even a small number of LSPs.= For those cases flooding speed does not matter.

The interesting case= s involve a large number of LSPs (hundreds or thousands). And in such cases= LFA/microloop avoidance techniques are not applicable.

 

Take the following s= imple topology:

 

   |  | = ... |            |

    = ; +---+          =    +---+

    = ; | C |           &n= bsp; | E |

    = ; +---+          =    +---+

    = ;   |          =        | 1000

    = ; +---+          =    +---+

    = ; | B |-------------| D |

    = ; +---+   1000      +---+= ;

    = ;   |          =        |

    = ;   |          =        |

    = ;    \         =       /

    = ;     \        =     /

    = ;      \       =   /

    = ;       \      /

    = ;         +---+<= /span>

    = ;         | A |

    = ;         +---+<= /span>

 

There is a topology = northbound of C and E (not shown) and a topology southbound of A (not shown= ).

Cost on all links is= 10 except B-D and D-E where cost is high.

 

C is a node with 100= 0 neighbors.

When all links are u= p, shortest path for all northbound destinations is via C.

All nodes in the net= work support fast flooding except for Node D.

Let’s say fast= flooding is 500 LSPs/second and slow flooding (Node D) is 20 LSPs/seconds.=

If  Node C fail= s we have 1000 LSPs to flood.

All nodes except for= D can receive these in 2 seconds (plus internode delay time).

D can receive LSPs i= n 50 seconds.

 

[Bruno] Thanks for your example. Agreed so far.=

 

When A and B and all= southbound nodes receive/process the LSP updates they will start sending t= raffic to Northbound destinations via D.

But for the better p= art of 50 seconds, Node D has yet to receive all LSP updates and still beli= eves that shortest path is via B-C. It will loop traffic.

 

[Bruno] May I remind you that we are discussing IS-IS flooding in= order to sync LSDB (LSP database). That is already a big enough subject. I= t does not including FIB (updates), nor IP forwarding.

 

Quoting you “when only some nodes in the network support fa= ster flooding the behavior of the whole network may not be "better&quo= t; when faster flooding is enabled because it prolongs the period of LSDB inconsistency.”

 

Taking your own examples, in both cases (all nodes support fast f= looding; all nodes but D support fast flooding) the period of LSDB inconsis= tency is 50 seconds. Hence this example does not illustrate your statement.

 

Hence I’m restating my questions:

 

> > when only some nodes in the network support faster floo= ding the behavior

> of the whole network may not be "better" when fast= er flooding is enabled

> because it prolongs the period of LSDB inconsistency.

> 

> 1) Do you have data on this?

>

> 2) If not, can you provide an example where increasing the f= looding rate on

> one adjacency prolongs the period of LSDB inconsistency acro= ss the

> network?

 

 

Had all nodes used s= low flooding, it still would have taken 50 seconds to converge, but there w= ould be significantly less looping. There could be a good amount of blackho= ling, but this is preferable to looping.

[Bruno] You are using an example where ordering FIB updates acros= s the network, e.g. as per [1], allows to reduce _FIB_ inconsistency= across the path/network. And you seem to conclude from this that this translates to LSDB update ordering. Those = are two different things. In this thread, I’d suggest that we focus o= n IGP flooding and LSDB sync only. (*)

[1] https://tools.ietf.org/html= /rfc6976

(*) We can discuss loop free IGP converge in a different thread i= f you want. IMO, the use of segment routing/source routing is better than o= FIB. But at some point, it still relies on fast flooding when multiple LSPs are involved. (and I mean _fast= _ not _ordered_)

 

--Bruno

 

One can always come = up with examples – based on a specific topology and a specific failur= e - where things might be better/worse/unchanged in the face of inconsisten= t flooding speed support.

But I hope this simp= le example illustrates the pitfalls.

 

    L= es

 

> -----Original M= essage-----

> From: bruno.decraene@orange.com <bruno.decraene@orange.com>

> Sent: Tuesday, = May 05, 2020 8:28 AM

> To: Les Ginsber= g (ginsberg) <ginsberg@cisco.com>; lsr@ietf.org

> Subject: Floodi= ng across a network

>

> Les,=

>

> > From: Lsr = [mailto:lsr-bounces@ietf.org] On Behalf Of Le= s Ginsberg

> (ginsberg)=

> > Sent: Mond= ay, May 4, 2020 4:39 PM

> [...]

> > when only = some nodes in the network support faster flooding the behavior

> of the whole ne= twork may not be "better" when faster flooding is enabled

> because it prol= ongs the period of LSDB inconsistency.

>

> 1) Do you have = data on this?

>

> 2) If not, can = you provide an example where increasing the flooding rate on

> one adjacency p= rolongs the period of LSDB inconsistency across the

> network?

>

> 3) In the meant= ime, let's try the theoretical analysis on a simple scenario

> where a single = LSP needs to be flooded across the network.

>

> - Let's call Di= j the time needed to flood the LSP from node i to the adjacent

> node j. Clearly= Dij>0.

> - Let's call k = the node originating this LSP at t0=3D0s

>

> >From t0, th= e LSDB is inconsistent across the network as all nodes but k are=

> missing the LSP= and hence only know about the 'old' topology.

>

> Let's call = ; SPT(k) the SPT rooted on k, using Dij as the metric between

> adjacent nodes = i and j. Let's call SP(k,i) the shortest path from k to i; and

> D(k,i) the shor= test distance between k and i.

>

> It seems that t= he time needed:

> - for node j to= learn about the LSP, and get in sync with k, is D(k,j)

> - for all nodes= across the network to learn about the LSP, and get in sync with=

> k, is Max[for a= ll j] D(k,j)

>

> Then how can re= ducing the flooding delay on one adjacency could prolongs

> the period of L= SDB inconsistency?

> It seems to me = that it can only improve/decrease it. Otherwise, this would

> mean that decre= asing the cost on a link can increase the cost of the shortest

> path.

>

> Note: I agree t= hat there are other cases, such as  multiple LSPs originated by

> the same node, = and multiple LSPs originated by multiple nodes, but let's start<= /p>

> with the simple= case.

>

> Thanks,

> --Bruno

>

> > -----Origi= nal Message-----

> > From: Lsr = [mailto:lsr-bounces@ietf.org] On Behalf Of Le= s Ginsberg

> (ginsberg)=

> > Sent: Mond= ay, May 4, 2020 4:39 PM

> >=

> > Henk -

> >=

> > Thanx for = your thoughtful posts.

> > I have rea= d your later posts on this thread as well - but decided to reply to

> this one.<= /o:p>

> > Top postin= g for better readability.

> >=

> > There is b= road agreement that faster flooding is desirable.

> > There are = now two proposals as to how to address the issue - neither of

> which is propos= ing to use TCP (or equivalent).

> >=

> > I have com= mented on why IS-IS flooding requirements are significantly

> different than = that for which TCP is used.

> > I think it= is also useful to note that even the simple test case which Bruno

> reported on in = last week's interim meeting demonstrated that without any

> changes to the = protocol at all IS-IS was able to flood an order of magnitude

> faster than it = commonly does today.

> > This gives= me hope that we are looking at the problem correctly and will not

> need "TCP&= quot;.

> >=

> > Introducin= g a TCP based solution requires:

> >=

> > a)A major = change to the adjacency formation logic

> >=

> > b)Removal = of the independence of the IS-IS protocol from the address

> families whose = reachability advertisements it supports - something which I

> think is a grea= t strength of the protocol - particularly in environments where<= /p>

> multiple addres= s family support is needed

> >=

> > I really d= on't want to do either of the above.

> >=

> > Your comme= nts regarding PSNP response times are quite correct - and

> both of the dra= ft proposals discuss this - though I agree more detail will be

> required.<= /o:p>

> > It is intu= itive that if you want to flood faster you also need to ACK faster -

> and probably ev= en retransmit faster when that is needed.

> > The basic = relationship between retransmit interval and PSNP interval is

> expressed in IS= O 10589:

> >=

> > " par= tialSNPInterval - This is the amount of time between periodic

>   &nb= sp;     > action for transmission of Partial Se= quence Number PDUs.

>   &nb= sp;     > It shall be less than minimumLSPTrans= mission-Interval."

> >=

> > Of course = ISO 10589 recommended values (2 seconds and 5 seconds

> respectively) a= ssociated with a much slower flooding rate and

> implementations= I am aware of use values in this order of magnitude. These

> numbers need to= be reduced if we are to flood faster, but the relationship

> between the two= needs to remain the same.

> >=

> > It is also= true - as you state - that sending ACKs more quickly will result in

> additional PDUs= which need to be received/processed by IS-IS - and this has

> some impact. Bu= t I think it is reasonable to expect that an implementation

> which can suppo= rt sending and receiving LSPs at a faster rate should also be

> able to send/re= ceive PSNPs at a faster rate. But we still need to be smarter

> than sending on= e PSNP/one LSP in cases where we have a burst.

> >=

> > LANs are a= more difficult problem than P2P - and thus far draft-ginsberg-lsr-

> isis-flooding-s= cale has been silent on this - but not because we aren't aware

> of this - just = have focused on the P2P behavior first.

> > What the b= est behavior on a LAN may be is something I am still considering.

> Slowing floodin= g down to the speed at which the slowest IS on the LAN can

> support may not= be the best strategy - as it also slows down the propagation

> rate for system= s downstream from the nodes on the LAN which can handle

> faster flooding= - thereby having an impact on flooding speed throughout the

> network in a wa= y which may be out of proportion. This is a smaller example

> of the larger i= ssue that when only some nodes in the network support faster

> flooding the be= havior of the whole network may not be "better" when faster<= /o:p>

> flooding is ena= bled because it prolongs the period of LSDB inconsistency.

> More work needs= to be done here...

> >=

> > In summary= , I don't expect to have to "reinvent TCP" - but I do think you

> have provided a= useful perspective for us to consider as we progress on this

> topic,

> >=

> > Thanx.

> >=

>   &nb= sp; > Les

> >=

> >=

> > > -----= Original Message-----

> > > From:= Lsr <lsr-bounces@ietf.org> On Behalf O= f Henk Smit

> > > Sent:= Thursday, April 30, 2020 6:58 AM

> > > To: <= a href=3D"mailto:lsr@ietf.org"> lsr@ietf.org

> > > Subje= ct: [Lsr] Why only a congestion-avoidance algorithm on the sender

> isn't

> > > enoug= h

> > ><= /o:p>

> > ><= /o:p>

> > > Hello= all,

> > ><= /o:p>

> > > Two y= ears ago, Gunter Van de Velde and myself published this draft:

> > > https://tools.ietf.or= g/html/draft-hsmit-lsr-isis-flooding-over-tcp-00

> > > That = started this discussion about flow/congestion control and ISIS

> > > flood= ing.

> > ><= /o:p>

> > > My th= oughts were that once we start implementing new algorithms to

> > > optim= ize ISIS flooding speed, we'll end up with our own version of TCP.

> > > I thi= nk most people here have a good general understanding of TCP.

> > > But i= f not, this is a good overview how TCP does it:

> > > https://en.wikipedia.= org/wiki/TCP_congestion_control

> > ><= /o:p>

> > ><= /o:p>

> > > What = does TCP do:

> > > =3D= =3D=3D=3D

> > > TCP d= oes 2 things: flow control and congestion control.

> > ><= /o:p>

> > > 1) Fl= ow control is: the receiver trying to prevent itself from being<= /p>

> > > overl= oaded. The receiver indicates, through the receiver-window-size<= /p>

> > > in th= e TCP acks, how much data it can or wants to receive.

> > > 2) Co= ngestion control is: the sender trying to prevent the links between

> > > sende= r and receiver from being overloaded. The sender makes an

> educated

> > > guess= at what speed it can send.

> > ><= /o:p>

> > ><= /o:p>

> > > The p= art we seem to be missing:

> > > =3D= =3D=3D=3D

> > > For t= he sender to make a guess at what speed it can send, it looks at=

> > > how t= he transmission is behaving. Are there drops ? What is the RTT ?=

> > > Do dr= op-percentage and RTT change ? Do acks come in at the same rate<= /p>

> > > as th= e sender sends segments ? Are there duplicate acks ? To be able<= /p>

> > > to do= this, the sender must know what to expect. How acks behave.

> > ><= /o:p>

> > > If yo= u want an ISIS sender to make a guess at what speed it can send,=

> > > witho= ut changing the protocol, the only thing the sender can do is look

> > > at th= e PSNPs that come back from the receiver. But the RTT of PSNPs can

> > > not b= e predicted. Because a good ISIS implementation does not

> > > immed= iately

> > > send = a PSNP when it receives a LSP. 1) the receiver should jitter the=

> > > PSNP,=

> > > like = it should jitter all packets. And 2) the receiver should wait a<= /p>

> > > littl= e

> > > to se= e if it can combine multiple acks into a single PSNP packet.

> > ><= /o:p>

> > > In TC= P, if a single segment gets lost, each new segment will cause the

> > > recei= ver to send an ack with the seqnr of the last received byte. This

> > > is ca= lled "duplicate acks". This triggers the sender to do<= /p>

> > > fast-= retransmission. In ISIS, this can't be be done. The information<= /p>

> > > a sen= der can get from looking at incoming PSNPs is a lot less than what

> > > TCP c= an learn from incoming acks.

> > ><= /o:p>

> > ><= /o:p>

> > > The p= roblem with sender-side congestion control:

> > > =3D= =3D=3D=3D

> > > In IS= IS, all we know is that the default retransmit-interval is 5

> > > secon= ds.

> > > And I= think most implementations use that as the default. This means<= /p>

> > > that<= o:p>

> > > the r= eceiver of an LSP has one requirement: send a PSNP within 5

> > > secon= ds.

> > > For t= he rest, implementations are free to send PSNPs however and

> > > whene= ver

> > > they = want. This means a sender can not really make conclusions about<= /p>

> > > flood= ing speed, dropped LSPs, capacity of the receiver, etc.

> > > There= is no ordering when flooding LSPs, or sending PSNPs. This makes=

> > > a sen= der-side algorithm for ISIS a lot harder.

> > ><= /o:p>

> > > When = you think about it, you realize that a sender should wait the

> > > full = 5 seconds before it can make any real conclusions about dropped<= /p>

> > > LSPs.=

> > > If a = sender looks at PSNPs to determine its flooding speed, it will

> > > proba= bly

> > > not b= e able to react without a delay of a few seconds. A sender might=

> > > send<= o:p>

> > > hunde= rds or thousands of LSPs in those 5 seconds, which might all or<= /p>

> > > parti= ally be dropped, complicating matters even further.

> > ><= /o:p>

> > ><= /o:p>

> > > A sen= der-sider algorithm should specify how to do PSNPs.

> > > =3D= =3D=3D=3D

> > > So im= ho a sender-side only algorithm can't work just like that in a

> > > multi= -vendor environment. We must not only specify a congestion-

> control

> > > algor= ithm for the sender. We must also specify for the receiver a more

> > > speci= fic algorithm how and when to send PSNPs. At least how to do

> PSNPs

> > > under= load.

> > ><= /o:p>

> > > Note = that this might result in the receiver sending more (and smaller)

> > > PSNPs= .

> > > More = packets might mean more congestion (inside routers).

> > ><= /o:p>

> > ><= /o:p>

> > > Will = receiver-side flow-control work ?

> > > =3D= =3D=3D=3D

> > > I don= 't know if that's enough. It will certainly help.

> > ><= /o:p>

> > > I thi= nk to tackle this problem, we need 3 parts:

> > > 1) se= nder-side congestion-control algorithm

> > > 2) mo= re detailed algorithm on receiver when and how to send PSNPs

> > > 3) re= ceiver-side flow-control mechanism

> > ><= /o:p>

> > > As di= scussed at length, I don't know if the ISIS process on the

> > > recei= ving

> > > route= r can actually know if its running out of resources (buffers on<= /p>

> > > inter= faces, linecards, etc). That's implementation dependent. A receiver

> > > can d= efinitely advertise a fixed value. So the sender has an upper bound

> > > to us= e when doing congestion-control. Just like TCP has both a

> > > flow-= control

> > > windo= w and a congestion-control window, and a sender uses both.

> Maybe

> > > the

> > > recei= ver can even advertise a dynamic value. Maybe now, maybe only in=

> > > the

> > > futur= e. An advertised upper limit seems useful to me today.

> > ><= /o:p>

> > ><= /o:p>

> > > What = I didn't like about our own proposal (flooding over TCP):

> > > =3D= =3D=3D=3D

> > > The p= roblem I saw with flooding over TCP concerns multi-point networks

> > > (LANs= ).

> > ><= /o:p>

> > > When = flooding over a multi-point network, setting up TCP connections<= /p>

> > > intro= duces serious challenges. Who are the endpoints of the TCP

> > > conne= ctions ?

> > > Full = mesh ? Or do all ISes on a LAN create a TCP-connection to the DIS ?

> > > There= is no backup DIS in ISIS (unlike OSPF). Things get messy quickly.

> > ><= /o:p>

> > > Howev= er, the other two proposals do not solve this problem either.

> > > How w= ill a sender-side congestion-avoidence algorithm determine

> whether

> > > there= were drops ? There are no acks (PSNPs) on a LAN. We assume most=

> > > LSPs<= o:p>

> > > that = are broadcasted are received by all other ISes on the LAN. There=

> > > are

> > > no ac= ks. Only after the DIS has sent its periodic CSNPs, ISes can send

> > > PSNPs= to request retransmissions. It seems impossible (or very hard) to

> > > me fo= r all ISes on a LAN to keep track of dropped LSPs and adjust their

> > > sendi= ng speed accordingly..

> > ><= /o:p>

> > > When = flooding on a LAN, the receiver-side algorithm seems best.

> Because

> > > all I= Ses can see what the lowest advertised sending-speed is. And make

> > > sure = they send slow enough to not overload the slowest IS. I'm not sure

> > > this = is a good solution, but is seems easier and more realistic than<= /p>

> > > ISIS-= flooding-over-TCP or sender-side congestion-avoidance.

> > ><= /o:p>

> > ><= /o:p>

> > > My co= nclusion:

> > > =3D= =3D=3D=3D

> > > Sende= r-side congestion-control won't work without specifying in more<= /p>

> > > detai= l how and when to send PSNPs.

> > > Recei= ver-side flow-control will certainly help. I dont' know if it's<= /p>

> > > good = enough. I don't know if advertising a static value is good enough.

> > > But i= t's a start.

> > ><= /o:p>

> > > I sti= ll think we'll end up re-implementing a new (and weaker) TCP.

> > ><= /o:p>

> > ><= /o:p>

> > > henk.=

> > ><= /o:p>

> > > _____= __________________________________________

> > > Lsr m= ailing list

> > > Lsr@ietf.org

> > > https://www.ietf.org/= mailman/listinfo/lsr

> >=

> > __________= _____________________________________

> > Lsr mailin= g list

> > Lsr@ietf.org

> > https://www.ietf.org/= mailman/listinfo/lsr

>

> _______________= ___________________________________________

> _______________= ___________________________________________

> _____

>

> Ce message et s= es pieces jointes peuvent contenir des informations

> confidentielles= ou privilegiees et ne doivent donc

> pas etre diffus= es, exploites ou copies sans autorisation. Si vous avez recu ce<= /p>

> message par err= eur, veuillez le signaler

> a l'expediteur = et le detruire ainsi que les pieces jointes. Les messages

> electroniques e= tant susceptibles d'alteration,

> Orange decline = toute responsabilite si ce message a ete altere, deforme ou

> falsifie. Merci= .

>

> This message an= d its attachments may contain confidential or privileged

> information tha= t may be protected by law;

> they should not= be distributed, used or copied without authorisation.

> If you have rec= eived this email in error, please notify the sender and delete

> this message an= d its attachments.

> As emails may b= e altered, Orange is not liable for messages that have been

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Orange decline toute responsabilite=
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Ce message et ses pieces jointes peuvent contenir des informatio=
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<158867189453.14412.14632358918213286203@ietfa.amsl.com> <8dd49248-84bd-a546-8fee-767ab75a182a@cisco.com> In-Reply-To: <8dd49248-84bd-a546-8fee-767ab75a182a@cisco.com> From: Dhruv Dhody Date: Wed, 6 May 2020 21:10:08 +0530 Message-ID: To: Peter Psenak Cc: rtg-dir@ietf.org, draft-ietf-ospf-mpls-elc.all@ietf.org, lsr@ietf.org, last-call@ietf.org Content-Type: text/plain; charset="UTF-8" Archived-At: Subject: Re: [Lsr] Rtgdir last call review of draft-ietf-ospf-mpls-elc-13 X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 06 May 2020 15:40:52 -0000 Hi Peter, Thanks for your reply, snipping to points that need further discussion... > What about: > > Segment Routing with the MPLS Data Plane relies on Interior Gateway > Protocols (IGP) such as OSPFv2 [RFC8665] and OSPFv3 [RFC8666] to signal > labels. > Much better. > > (3) Section 4 > > > > The absence of ERLD-MSD advertisements indicates only that the > > advertising node does not support advertisement of this capability. > > > > Do you mean to differentiate between support for the capability itself v/s > > support for 'advertisement' only. But RFC 8662 says that ERLD value is > > advertised only when following conditions are met: > > What is meant is that even though all the below conditions are set, if > the node does not support the advertisement, one can not conclude what > its ERLD is. > > If the node supports the advertisement of the ERLD, but the below > conditions are not met, the node should not advertise the ELC capability > in a first place. > There are two things here - (a) the actual load balancing capability of a node (b) the capability to advertise the ELC/ERLD. Usually capability and the advertisement of the capability go together. In this case we want to be explicit that the absence of ERLD-MSD indicates just (b) and not (a). You do use the word "only", so may its all fine! I will leave it to you/shepherd. > > > > * MUST be entropy label capable and, as a consequence, MUST apply > > the data-plane procedures defined in [RFC6790]. > > > > * MUST be able to read an ELI/EL, which is located within its ERLD > > value. > > > > * MUST take into account an EL within the first ERLD labels in its > > load-balancing function. > > > > Thus, I am not sure about this sentence. Maybe you mean to say that the > > absence only indicates that the ERLD-MSD value of the node is unknown (and > > it might still be capable of handling ELI/EL)? > > > > (4) Section 4 > > > > What would be the behavior if an OSPF router receives a ERLD of the node > > but no ELC set for the corresponding prefix? That would be an error as per > > RFC 8662, we should specify how one handles it within OSPF. If it is to > > just ignore the ERLD, we should explicitly say that. > > the behavior is specified in the RFC 8662. OSPF is just a messenger, > not the consumer of this information. > Is there some text in RFC 8662 the clarify what one does on the receiving side? I found only the sending conditions in section 4. How does a receiving node behaves when he receives conflicting information, which one does he trust (no ELC present or ERLD=10). We could have interop issues here if you leave it open. Thanks! Dhruv PS. Since the comments are the same for the IS-IS I-D, no need duplicate them. From nobody Wed May 6 09:00:16 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 1EFF23A0B67; Wed, 6 May 2020 09:00:01 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -9.601 X-Spam-Level: X-Spam-Status: No, score=-9.601 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIMWL_WL_MED=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, SPF_PASS=-0.001, URIBL_BLOCKED=0.001, USER_IN_DEF_DKIM_WL=-7.5] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=cisco.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id c_ZfvOdmUscT; Wed, 6 May 2020 08:59:59 -0700 (PDT) Received: from aer-iport-4.cisco.com (aer-iport-4.cisco.com [173.38.203.54]) (using TLSv1.2 with cipher DHE-RSA-SEED-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 72D5C3A08CB; Wed, 6 May 2020 08:59:58 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=3600; q=dns/txt; s=iport; t=1588780799; x=1589990399; h=subject:to:cc:references:from:message-id:date: mime-version:in-reply-to:content-transfer-encoding; bh=JqSc6XF7pFZlXXgurIO2E9w4ghmaPk+vME7dscpoFAc=; b=kWsjI0FcvwkBJQYza1TI7/TA65vWwnc54zP9q2td+9gmv2WAsHQQOKQx o6Px+10/KmgnBKgpqMN6aRueHBjgL+WncxhTrAdDIPaeRc78b15Us5n6B rxQq5ufCdAKcOpWZwsqfteFO9H6Hy9UbNsw93nQ8qiW/zLqydGQ8WQzur E=; X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: =?us-ascii?q?A0DmAACb3rJe/xbLJq1mHAEBAQEBAQc?= =?us-ascii?q?BARIBAQQEAQFAgTYEAQELAYNsIBKETYkBh2AtmXeBZwsBAQEOLwQBAYREAoI?= =?us-ascii?q?lNwYOAgMBAQsBAQUBAQECAQUEbYVihXEBAQEBAgEjFUEQCxgCAhEVAgJXBg0?= =?us-ascii?q?IAQGDIoJdILNQdoEyhVCDPoFAgQ4qAYxdgUE/gRABJ4JpPoQHH2eCU4JgBJk?= =?us-ascii?q?KmUeCUoJwlSAGHYJbiGGEVCeMaa1bgWgjgVYzGggbFYMlTxgNnww/A2cCBgg?= =?us-ascii?q?BAQMJkAKCRAEB?= X-IronPort-AV: E=Sophos;i="5.73,359,1583193600"; d="scan'208";a="25882149" Received: from aer-iport-nat.cisco.com (HELO aer-core-2.cisco.com) ([173.38.203.22]) by aer-iport-4.cisco.com with ESMTP/TLS/DHE-RSA-SEED-SHA; 06 May 2020 15:59:56 +0000 Received: from [10.60.140.51] (ams-ppsenak-nitro2.cisco.com [10.60.140.51]) by aer-core-2.cisco.com (8.15.2/8.15.2) with ESMTP id 046Fxsgv001506; Wed, 6 May 2020 15:59:55 GMT To: Dhruv Dhody Cc: rtg-dir@ietf.org, draft-ietf-ospf-mpls-elc.all@ietf.org, lsr@ietf.org, last-call@ietf.org References: <158867189453.14412.14632358918213286203@ietfa.amsl.com> <8dd49248-84bd-a546-8fee-767ab75a182a@cisco.com> From: Peter Psenak Message-ID: Date: Wed, 6 May 2020 17:59:55 +0200 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:60.0) Gecko/20100101 Thunderbird/60.7.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-Outbound-SMTP-Client: 10.60.140.51, ams-ppsenak-nitro2.cisco.com X-Outbound-Node: aer-core-2.cisco.com Archived-At: Subject: Re: [Lsr] Rtgdir last call review of draft-ietf-ospf-mpls-elc-13 X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 06 May 2020 16:00:02 -0000 Hi Dhruv, please see inline: On 06/05/2020 17:40, Dhruv Dhody wrote: > Hi Peter, > > Thanks for your reply, snipping to points that need further discussion... > >> What about: >> >> Segment Routing with the MPLS Data Plane relies on Interior Gateway >> Protocols (IGP) such as OSPFv2 [RFC8665] and OSPFv3 [RFC8666] to signal >> labels. >> > > Much better. > > >>> (3) Section 4 >>> >>> The absence of ERLD-MSD advertisements indicates only that the >>> advertising node does not support advertisement of this capability. >>> >>> Do you mean to differentiate between support for the capability itself v/s >>> support for 'advertisement' only. But RFC 8662 says that ERLD value is >>> advertised only when following conditions are met: >> >> What is meant is that even though all the below conditions are set, if >> the node does not support the advertisement, one can not conclude what >> its ERLD is. >> >> If the node supports the advertisement of the ERLD, but the below >> conditions are not met, the node should not advertise the ELC capability >> in a first place. >> > > There are two things here - (a) the actual load balancing capability > of a node (b) the capability to advertise the ELC/ERLD. Usually > capability and the advertisement of the capability go together. In > this case we want to be explicit that the absence of ERLD-MSD > indicates just (b) and not (a). > > You do use the word "only", so may its all fine! I will leave it to > you/shepherd. yes, the absence of ERLD-MSD advertisements only indicates that a node does not support advertisement of (b). It can not be interpreted that (b) is not supported. Old nodes that do not advertise ERLD-MSD can not be assumed not to support non-zero ERLD. The "only" is there to express the above. > >>> >>> * MUST be entropy label capable and, as a consequence, MUST apply >>> the data-plane procedures defined in [RFC6790]. >>> >>> * MUST be able to read an ELI/EL, which is located within its ERLD >>> value. >>> >>> * MUST take into account an EL within the first ERLD labels in its >>> load-balancing function. >>> >>> Thus, I am not sure about this sentence. Maybe you mean to say that the >>> absence only indicates that the ERLD-MSD value of the node is unknown (and >>> it might still be capable of handling ELI/EL)? >>> >>> (4) Section 4 >>> >>> What would be the behavior if an OSPF router receives a ERLD of the node >>> but no ELC set for the corresponding prefix? That would be an error as per >>> RFC 8662, we should specify how one handles it within OSPF. If it is to >>> just ignore the ERLD, we should explicitly say that. >> >> the behavior is specified in the RFC 8662. OSPF is just a messenger, >> not the consumer of this information. >> > > Is there some text in RFC 8662 the clarify what one does on the > receiving side? I found only the sending conditions in section 4. How > does a receiving node behaves when he receives conflicting > information, which one does he trust (no ELC present or ERLD=10). We > could have interop issues here if you leave it open. well, if the node does not support ELC, then ERLD value is irrelevant. It's like having a speed limit for a road with no entry. But that is something that does not belong to protocol drafts. thanks, Peter > > Thanks! > Dhruv > > PS. Since the comments are the same for the IS-IS I-D, no need duplicate them. > > From nobody Wed May 6 09:02:11 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id B334D3A0B69 for ; Wed, 6 May 2020 09:02:09 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.5 X-Spam-Level: X-Spam-Status: No, score=-1.5 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FORGED_FROMDOMAIN=0.25, FREEMAIL_FROM=0.001, HEADER_FROM_DIFFERENT_DOMAINS=0.249, SPF_HELO_NONE=0.001, SPF_PASS=-0.001] autolearn=no autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id f9W-K9gwUFWh for ; Wed, 6 May 2020 09:02:08 -0700 (PDT) Received: from mail-pl1-x635.google.com (mail-pl1-x635.google.com [IPv6:2607:f8b0:4864:20::635]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 5CE3A3A080B for ; Wed, 6 May 2020 09:02:08 -0700 (PDT) Received: by mail-pl1-x635.google.com with SMTP id x10so663288plr.4 for ; Wed, 06 May 2020 09:02:08 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=sender:mime-version:subject:from:in-reply-to:date:cc :content-transfer-encoding:message-id:references:to; bh=vDK8qq2+uCZesl+Sm11ytX7NqsvYtkIgJkDUVBMtYtk=; b=iOjlk5KGNCgfvx0Nu14kSTZf8InhkmocYNjF26LToLLpXv/odpOePNTI+BbFtlXUsQ zdkv4vvFUSgAmptv/rHl7yGKnWfqvPoDF0d7pK+SBtY3TqJ6eiNBk4mSKWQ2HouBqitc y5kumSTLImX+aQZdQN5F/KrcEg+lSY4G4zeiwns8w1fX4oFCsg40NN8I4Gdd+UkHWREy tbrA/Y42sYWw361cxEF6S515ZC0/OSHGeFgLmMxUcDi6Y+qRGQVjwGuH0ac8UMYgjp8V /MrJi99/2PFQBEgv9XrSLuExesLy3fJ6RyNl/ZQgPqtSUyHdJYt7d7ewYBQApvOTEx9H UYhQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:mime-version:subject:from:in-reply-to :date:cc:content-transfer-encoding:message-id:references:to; bh=vDK8qq2+uCZesl+Sm11ytX7NqsvYtkIgJkDUVBMtYtk=; b=ClK596Pv/RkiyVBaZV7JAaVPhOMyy0fFnLZcqqdwKCfqyB/Cwt1BfW2+vOgcl7Bt2w Cp3ljai42kq9jTsnE4TdxowI7TDhtGWsqwduAu8tnU6Y6im01oEIWoRTqlrmy1KD68Fi DZ9Fx8+ypDSMdO1EWRfwld+/JB9ILKAac36noAs2bl2IPbecwg6OOWS8MxyUJgdRWS/9 j9+TtXsTO+yd2mVuqtVzcJy3DjFLdw2RttJlPUvRuBE2xZDa0wFaXP8h/sUvt+g0q3v6 acIwhE16okfGF0d0oS9lnZmWtrQZcGfhJZaMoEc3OT8HjCEbpUq2RVVAATqkM11bw1t7 MjDg== X-Gm-Message-State: AGi0PuaUBXHG94U/MBncyIKT6QLQ1MKi1d1Xc513Mft/xn/AIEiftxgk PZdZnnoO5gxKPJFhNc6k87Q= X-Google-Smtp-Source: APiQypIlkXFSnqmE+tx7aCIaCw19QGAGIhhdq8lbNcLlD5E7aAigM6dQTtQkaGv4vWkRxWtec2jexQ== X-Received: by 2002:a17:90a:a00a:: with SMTP id q10mr9878589pjp.103.1588780927725; Wed, 06 May 2020 09:02:07 -0700 (PDT) Received: from [10.95.83.218] ([162.210.129.5]) by smtp.gmail.com with ESMTPSA id nu10sm5666314pjb.9.2020.05.06.09.02.05 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Wed, 06 May 2020 09:02:06 -0700 (PDT) Sender: Tony Li Content-Type: text/plain; charset=utf-8 Mime-Version: 1.0 (Mac OS X Mail 13.4 \(3608.80.23.2.2\)) From: tony.li@tony.li In-Reply-To: <21e4996c370b475db4eb4e7ffc298434@huawei.com> Date: Wed, 6 May 2020 09:02:02 -0700 Cc: "lsr@ietf.org" , Christian Hopps Content-Transfer-Encoding: quoted-printable Message-Id: <364EDB68-ABA4-4AA9-910E-065A15DB0965@tony.li> References: <8016231f9ff94bd2b0f5ef989608922f@huawei.com> <21e4996c370b475db4eb4e7ffc298434@huawei.com> To: "Gengxuesong (Geng Xuesong)" X-Mailer: Apple Mail (2.3608.80.23.2.2) Archived-At: Subject: Re: [Lsr] Congestion (flow) control thoughts. X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 06 May 2020 16:02:10 -0000 Hi Xuesong, > I think there is no need to distinguish the concept of flow = control and congestion control, considering that the core idea is the = same: monitor the sending rate to match the capability of the = bottleneck, no matter there are competitors or not. And the control loop = is necessary in both case.=20 This matches my perspective. > Thank you for explaining about the bottleneck of flooding = and different cc solutions that are under discussion. It is helpful and = I will read the drafts.=20 > There is still one more question left in the previous email: " What is = the criteria of comparing different solutions?". I think this is crucial = for further discussion and comparative tests. I notice that in Bruno's = data, some parameters are mentioned, such as " Duration"," LSP/second"," = avg inter-LSP delay", "retransmission time". I'm wondering whether it is = able to choose a better solution through these parameters. If not, what = should be added or considered. (Some other issues are also considered = when choosing cc mechanism in layer 4, such as: fairness among flows, = co-existence with other cc mechanism .. ) Sorry for missing the question. The criteria are, I think, quite clear: = minimize overall flooding time. As Bruno=E2=80=99s figures show, that = does NOT happen simply by transmitting at the maximum rate. That causes = overruns, resulting in retransmissions and that ends up being quite slow = (tho we can work on that too). The question then is: what control = mechanisms do we put in place to ensure minimal flooding time? This = needs to interoperate across the full spectrum of implementations: fast = brand X needs to not overrun slow brand Y while performing well with = fast brand Z. The floor is very much open. Tony From nobody Wed May 6 09:51:06 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 884783A043D for ; Wed, 6 May 2020 09:50:53 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.897 X-Spam-Level: X-Spam-Status: No, score=-1.897 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, SPF_HELO_NONE=0.001, SPF_NONE=0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id XEBgr-NdMCqJ for ; Wed, 6 May 2020 09:50:49 -0700 (PDT) Received: from smtp.chopps.org (smtp.chopps.org [54.88.81.56]) by ietfa.amsl.com (Postfix) with ESMTP id 4DF843A086A for ; Wed, 6 May 2020 09:50:44 -0700 (PDT) Received: from stubbs.int.chopps.org (047-050-069-038.biz.spectrum.com [47.50.69.38]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by smtp.chopps.org (Postfix) with ESMTPSA id 0C67B611E0; Wed, 6 May 2020 16:50:42 +0000 (UTC) Content-Type: text/plain; charset=utf-8 Mime-Version: 1.0 (Mac OS X Mail 13.4 \(3608.80.23.2.2\)) From: Christian Hopps In-Reply-To: Date: Wed, 6 May 2020 12:50:41 -0400 Cc: Christian Hopps , "bruno.decraene@orange.com" , "lsr@ietf.org" Content-Transfer-Encoding: quoted-printable Message-Id: <331BA4DA-0F04-4D67-AAC3-CFCC207FC53B@chopps.org> References: <24209_1588692477_5EB185FD_24209_35_1_53C29892C857584299CBF5D05346208A48E3D455@OPEXCAUBM43.corporate.adroot.infra.ftgroup> <6287_1588771252_5EB2B9B4_6287_332_1_53C29892C857584299CBF5D05346208A48E3F698@OPEXCAUBM43.corporate.adroot.infra.ftgroup> <10562_1588775602_5EB2CAB2_10562_251_11_53C29892C857584299CBF5D05346208A48E3FB63@OPEXCAUBM43.corporate.adroot.infra.ftgroup> <87CDE7F3-E08D-4C45-9AF1-9DAD635F8908@chopps.org> To: "Les Ginsberg (ginsberg)" X-Mailer: Apple Mail (2.3608.80.23.2.2) Archived-At: Subject: Re: [Lsr] Flooding across a network X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 06 May 2020 16:50:54 -0000 I guess all this discussion has to do with this other part of that = document: "o Limitations on the processing rate of incoming control traffic However, intentionally using different flooding rates on different interfaces increases the possibility of longer periods of LSDB inconsistency which in turn delays network wide convergence." [chopps: but using dynamic rates (thus different), allows one to flood = around a bad node in the network, among other things, see below] Many implementations provide knobs to control the rate of LSP flooding on a per interface basis. To the extent that this serves as a flow control mechanism, this may reduce the number of dropped LSPs during high activity bursts and thereby reduce the number of LSP retransmissions required. As LSP retransimssion timers are typically long (multiple seconds), this may result in shorter convergence times than if the LSP burst was uncontrolled. But if the performance characteristics of routers in the network are such that some routers consistently accept and process fewer LSPs/second than other routers, convergence will be degraded. Tuning LSP transmission timers on a per interface basis will never provide optimal convergence. Consistent flooding rates should be used on all interfaces." This last bit is what people are disagreeing with since we are now = considering dynamically updating the flooding rate to be locally = optimal, and I believe that last part is targeted at that concept. The document is implying that it is not only minimizing LSDB = inconsistency in the network by flooding at the same rate on all = interfaces, but it is asserting that doing differently will never = provide optimal convergence. I believe that assertion is false; it is = ignoring topological differences. Consider this network: +-+ | | --- [C0] ... [x0] |A| | | | ------------ [C1] +-+ If the same flooding rate is used everywhere, or even just on As = interfaces, and C1 and x0 (prior to the LSDB change) used to reach [A] = through [C1->A] but after the LSDB change will reach [A] through = [x0->..C0] you will have guaranteed a loop between [C1] and [x0] to = reach [A] for all the unnecessary flooding delay the document is adding = through equality requirements.=20 If instead you flood optimally (allowing for going as fast as possible) = then the loop is minimized to the difference between [A]-[C1] flood time = and [A]-[C0]-...-[x0] flood time. Clearly an optimal flooding rate (even = if unequal) minimizes the loop between [C1] and [x0]. This is just one = of any number of similar topologies that are possible (imagine a bunch = of sub-topologies that replicate the issue above). Anyway I'm with Tony Li here, we need some running code and data to look = at with various scenarios. Thanks, Chris. [as WG member] > On May 6, 2020, at 10:58 AM, Les Ginsberg (ginsberg) = wrote: >=20 > Chris - >=20 > I agree. >=20 > = https://tools.ietf.org/html/draft-ginsberg-lsr-isis-flooding-scale-02#sect= ion-3.1 states: >=20 > " Inability to handle LSP reception at the > targeted flooding rate should be viewed as an error condition which > should be reported. If this condition persists, it indicates that > the network is provisioned in a way which does not support optimal > convergence. Steps need to be taken to resolve this issue. Such > steps could include upgrading the routers that demonstrate this > condition consistently, altering the configuration on the = problematic > routers or altering the position of the problematic routers in the > network so as to reduce the overall load on those routers, or > reducing the LSP transmission rate network-wide." >=20 > Les >=20 >> -----Original Message----- >> From: Christian Hopps >> Sent: Wednesday, May 06, 2020 7:48 AM >> To: bruno.decraene@orange.com >> Cc: Christian Hopps ; Les Ginsberg (ginsberg) >> ; lsr@ietf.org >> Subject: Re: [Lsr] Flooding across a network >>=20 >> Bruno persistence has made me realize something fundamental here. >>=20 >> The minute the LSP originator changes the LSP and floods it you have = LSDB >> inconsistency. That is going to last until the last node in the = network has >> updated it's LSDB. >>=20 >> Les is pointing out that LSDB inconsistency can be bad in certain >> circumstances e.g., if a critical node is slow and thus inconsistent. >>=20 >> I believe the right way to fix this is a simple one, help the = operator flag the >> broken router software/hardware for replacement, but otherwise IS-IS >> should just try to do the best job it can do to which is to flood = around the >> problem (i.e., flood as optimally as possible). >>=20 >> Thanks, >> Chris. >> [as WG member] >>=20 >>=20 >>> On May 6, 2020, at 10:33 AM, bruno.decraene@orange.com wrote: >>>=20 >>> Les, >>>=20 >>> From: Les Ginsberg (ginsberg) [mailto:ginsberg@cisco.com] >>> Sent: Wednesday, May 6, 2020 4:14 PM >>> To: DECRAENE Bruno TGI/OLN >>> Cc: lsr@ietf.org >>> Subject: RE: Flooding across a network >>>=20 >>> Bruno =E2=80=93 >>>=20 >>> I am somewhat at a loss to understand your comments. >>> The example is straightforward and does not need to consider FIB = update >> time nor the ordering of prefix updates on different nodes. >>> [Bruno] The example is straightforward but you are referring to FIB = and IP >> packets forwarding as per those FIBs. >>> I=E2=80=99d like we focus on LSP flooding and LSDB consistency. >>>=20 >>> Consider the state of Node B and Node D at various time points from = the >> trigger event. >>>=20 >>> T+ 2 seconds: >>> ----------------- >>> B has received all LSP Updates. It triggers an SPF and for all = Northbound >> destinations previously reachable via C it installs paths via D. >>> Let=E2=80=99s assume it take 5 seconds to update the forwarding = plane. >>>=20 >>> D has received 40 of the 1000 LSP updates. It triggers an SPF and = finds that >> all Northbound destinations are reachable via B-C. It makes no = changes to >> the forwarding plane. >>>=20 >>> T+7 seconds >>> ----------------- >>> B has completed FIB updates. Traffic to all Northbound destinations = is being >> forwarded via D. >>>=20 >>> D has now received 140 of the 1000 LSP updates. Entries in its = forwarding >> plane for Northbound destinations still point to B. >>>=20 >>> We have a loop. >>>=20 >>> T + 30 seconds >>> -------------------- >>> D has now received 600 of the 1000 LSP updates. Still no changes to = its >> forwarding plane. >>> Traffic to Northbound destinations is still looping. >>>=20 >>> T+ 50 seconds >>> ------------------- >>> D has finally received all 1000 LSP updates.. >>> It triggers (another) SPF and calculates paths to Northbound = destinations >> via E. It begins to update its forwarding plane. >>> Let=E2=80=99s assume this will take 5 seconds.. >>>=20 >>> T + 55 seconds >>> -------------------- >>> D has completed forwarding plane updates =E2=80=93 no more looping. >>>=20 >>> That is all I am trying to illustrate. >>>=20 >>> If you want to start arguing that node protecting LFAs + microloop >> avoidance could help (NOTE I explicitly took those out of the = example for >> simplicity) =E2=80=93 it is easy enough to change the example to = include multiple node >> failures or a node failure plus some northbound link failures on = other nodes. >>> [Bruno] I=E2=80=99m not talking about LFA/FRR. And with regards to = microloops >> avoidance, some algorithms can handle any graph transition so = including >> multiple node failures. >>>=20 >>> But again, let=E2=80=99s stick to LSP flooding and LSDB consistency. = (you are the one >> speaking about microloops in the forwarding plane). >>>=20 >>> The point here is to look at the impact of long-lived LSDB = inconsistency >> which results when some nodes support flooding an order of magnitude >> faster flooding than other nodes =E2=80=93 which is what you asked me = to clarify. >>> [Bruno] No. I asked you to clarify why having a node with faster = flooding >> could prolongs the period of LSDB inconsistency. >>>=20 >>> Again, with you own words: =E2=80=9Cwhen only some nodes in the = network >> support faster flooding the behavior of the whole network may not be >> "better" when faster flooding is enabled because it prolongs the = period of >> LSDB inconsistency.=E2=80=9D >>> And with less words: =E2=80=9Cwhen only some nodes in the network = support >> faster flooding [=E2=80=A6] it prolongs the period of LSDB = inconsistency.=E2=80=9D >>>=20 >>> --Bruno >>>=20 >>> Les >>>=20 >>>=20 >>>=20 >>> From: bruno.decraene@orange.com >>> Sent: Wednesday, May 06, 2020 6:21 AM >>> To: Les Ginsberg (ginsberg) >>> Cc: lsr@ietf.org >>> Subject: RE: Flooding across a network >>>=20 >>> Les, >>>=20 >>> From: Les Ginsberg (ginsberg) [mailto:ginsberg@cisco.com] >>> Sent: Wednesday, May 6, 2020 1:35 AM >>> To: DECRAENE Bruno TGI/OLN; lsr@ietf..org >>> Subject: RE: Flooding across a network >>>=20 >>> Bruno - >>>=20 >>> Seems like it was not too long ago that we were discussing this in = person. >> Ahhh...the good old days... >>> [Bruno] Indeed, may be not to the point of concluding. Indeed. >>>=20 >>> First, let's agree that the interesting case does not involve 1 or = even a small >> number of LSPs. For those cases flooding speed does not matter. >>> The interesting cases involve a large number of LSPs (hundreds or >> thousands). And in such cases LFA/microloop avoidance techniques are = not >> applicable. >>>=20 >>> Take the following simple topology: >>>=20 >>> | | ... | | >>> +---+ +---+ >>> | C | | E | >>> +---+ +---+ >>> | | 1000 >>> +---+ +---+ >>> | B |-------------| D | >>> +---+ 1000 +---+ >>> | | >>> | | >>> \ / >>> \ / >>> \ / >>> \ / >>> +---+ >>> | A | >>> +---+ >>>=20 >>> There is a topology northbound of C and E (not shown) and a topology >> southbound of A (not shown). >>> Cost on all links is 10 except B-D and D-E where cost is high. >>>=20 >>> C is a node with 1000 neighbors. >>> When all links are up, shortest path for all northbound destinations = is via C. >>> All nodes in the network support fast flooding except for Node D. >>> Let=E2=80=99s say fast flooding is 500 LSPs/second and slow flooding = (Node D) is 20 >> LSPs/seconds. >>> If Node C fails we have 1000 LSPs to flood. >>> All nodes except for D can receive these in 2 seconds (plus = internode delay >> time). >>> D can receive LSPs in 50 seconds. >>>=20 >>> [Bruno] Thanks for your example. Agreed so far. >>>=20 >>> When A and B and all southbound nodes receive/process the LSP = updates >> they will start sending traffic to Northbound destinations via D. >>> But for the better part of 50 seconds, Node D has yet to receive all = LSP >> updates and still believes that shortest path is via B-C. It will = loop traffic. >>>=20 >>> [Bruno] May I remind you that we are discussing IS-IS flooding in = order to >> sync LSDB (LSP database). That is already a big enough subject. It = does not >> including FIB (updates), nor IP forwarding. >>>=20 >>> Quoting you =E2=80=9Cwhen only some nodes in the network support = faster >> flooding the behavior of the whole network may not be "better" when = faster >> flooding is enabled because it prolongs the period of LSDB = inconsistency.=E2=80=9D >>>=20 >>> Taking your own examples, in both cases (all nodes support fast = flooding; >> all nodes but D support fast flooding) the period of LSDB = inconsistency is 50 >> seconds. Hence this example does not illustrate your statement. >>>=20 >>> Hence I=E2=80=99m restating my questions: >>>=20 >>>>> when only some nodes in the network support faster flooding the >> behavior >>>> of the whole network may not be "better" when faster flooding is >> enabled >>>> because it prolongs the period of LSDB inconsistency. >>>>=20 >>>> 1) Do you have data on this? >>>>=20 >>>> 2) If not, can you provide an example where increasing the flooding = rate >> on >>>> one adjacency prolongs the period of LSDB inconsistency across the >>>> network? >>>=20 >>>=20 >>> Had all nodes used slow flooding, it still would have taken 50 = seconds to >> converge, but there would be significantly less looping. There could = be a >> good amount of blackholing, but this is preferable to looping. >>> [Bruno] You are using an example where ordering FIB updates across = the >> network, e.g. as per [1], allows to reduce _FIB_ inconsistency across = the >> path/network. And you seem to conclude from this that this translates = to >> LSDB update ordering. Those are two different things. In this thread, = I=E2=80=99d >> suggest that we focus on IGP flooding and LSDB sync only. (*) >>> [1] https://tools.ietf.org/html/rfc6976 >>> (*) We can discuss loop free IGP converge in a different thread if = you want. >> IMO, the use of segment routing/source routing is better than oFIB. = But at >> some point, it still relies on fast flooding when multiple LSPs are = involved. >> (and I mean _fast_ not _ordered_) >>>=20 >>> --Bruno >>>=20 >>> One can always come up with examples =E2=80=93 based on a specific = topology and >> a specific failure - where things might be better/worse/unchanged in = the >> face of inconsistent flooding speed support. >>> But I hope this simple example illustrates the pitfalls. >>>=20 >>> Les >>>=20 >>>> -----Original Message----- >>>> From: bruno.decraene@orange.com >>>> Sent: Tuesday, May 05, 2020 8:28 AM >>>> To: Les Ginsberg (ginsberg) ; lsr@ietf.org >>>> Subject: Flooding across a network >>>>=20 >>>> Les, >>>>=20 >>>>> From: Lsr [mailto:lsr-bounces@ietf.org] On Behalf Of Les Ginsberg >>>> (ginsberg) >>>>> Sent: Monday, May 4, 2020 4:39 PM >>>> [...] >>>>> when only some nodes in the network support faster flooding the >> behavior >>>> of the whole network may not be "better" when faster flooding is >> enabled >>>> because it prolongs the period of LSDB inconsistency. >>>>=20 >>>> 1) Do you have data on this? >>>>=20 >>>> 2) If not, can you provide an example where increasing the flooding = rate >> on >>>> one adjacency prolongs the period of LSDB inconsistency across the >>>> network? >>>>=20 >>>> 3) In the meantime, let's try the theoretical analysis on a simple = scenario >>>> where a single LSP needs to be flooded across the network. >>>>=20 >>>> - Let's call Dij the time needed to flood the LSP from node i to = the >> adjacent >>>> node j. Clearly Dij>0. >>>> - Let's call k the node originating this LSP at t0=3D0s >>>>=20 >>>>> =46rom t0, the LSDB is inconsistent across the network as all = nodes but k >> are >>>> missing the LSP and hence only know about the 'old' topology. >>>>=20 >>>> Let's call SPT(k) the SPT rooted on k, using Dij as the metric = between >>>> adjacent nodes i and j. Let's call SP(k,i) the shortest path from k = to i; and >>>> D(k,i) the shortest distance between k and i. >>>>=20 >>>> It seems that the time needed: >>>> - for node j to learn about the LSP, and get in sync with k, is = D(k,j) >>>> - for all nodes across the network to learn about the LSP, and get = in sync >> with >>>> k, is Max[for all j] D(k,j) >>>>=20 >>>> Then how can reducing the flooding delay on one adjacency could >> prolongs >>>> the period of LSDB inconsistency? >>>> It seems to me that it can only improve/decrease it. Otherwise, = this >> would >>>> mean that decreasing the cost on a link can increase the cost of = the >> shortest >>>> path. >>>>=20 >>>> Note: I agree that there are other cases, such as multiple LSPs = originated >> by >>>> the same node, and multiple LSPs originated by multiple nodes, but = let's >> start >>>> with the simple case. >>>>=20 >>>> Thanks, >>>> --Bruno >>>>=20 >>>>> -----Original Message----- >>>>> From: Lsr [mailto:lsr-bounces@ietf.org] On Behalf Of Les Ginsberg >>>> (ginsberg) >>>>> Sent: Monday, May 4, 2020 4:39 PM >>>>>=20 >>>>> Henk - >>>>>=20 >>>>> Thanx for your thoughtful posts. >>>>> I have read your later posts on this thread as well - but decided = to reply >> to >>>> this one. >>>>> Top posting for better readability. >>>>>=20 >>>>> There is broad agreement that faster flooding is desirable. >>>>> There are now two proposals as to how to address the issue - = neither of >>>> which is proposing to use TCP (or equivalent). >>>>>=20 >>>>> I have commented on why IS-IS flooding requirements are = significantly >>>> different than that for which TCP is used. >>>>> I think it is also useful to note that even the simple test case = which >> Bruno >>>> reported on in last week's interim meeting demonstrated that = without >> any >>>> changes to the protocol at all IS-IS was able to flood an order of >> magnitude >>>> faster than it commonly does today. >>>>> This gives me hope that we are looking at the problem correctly = and will >> not >>>> need "TCP". >>>>>=20 >>>>> Introducing a TCP based solution requires: >>>>>=20 >>>>> a)A major change to the adjacency formation logic >>>>>=20 >>>>> b)Removal of the independence of the IS-IS protocol from the = address >>>> families whose reachability advertisements it supports - something = which >> I >>>> think is a great strength of the protocol - particularly in = environments >> where >>>> multiple address family support is needed >>>>>=20 >>>>> I really don't want to do either of the above. >>>>>=20 >>>>> Your comments regarding PSNP response times are quite correct - = and >>>> both of the draft proposals discuss this - though I agree more = detail will >> be >>>> required. >>>>> It is intuitive that if you want to flood faster you also need to = ACK faster >> - >>>> and probably even retransmit faster when that is needed. >>>>> The basic relationship between retransmit interval and PSNP = interval is >>>> expressed in ISO 10589: >>>>>=20 >>>>> " partialSNPInterval - This is the amount of time between periodic >>>>> action for transmission of Partial Sequence Number PDUs. >>>>> It shall be less than minimumLSPTransmission-Interval." >>>>>=20 >>>>> Of course ISO 10589 recommended values (2 seconds and 5 seconds >>>> respectively) associated with a much slower flooding rate and >>>> implementations I am aware of use values in this order of = magnitude. >> These >>>> numbers need to be reduced if we are to flood faster, but the >> relationship >>>> between the two needs to remain the same. >>>>>=20 >>>>> It is also true - as you state - that sending ACKs more quickly = will result >> in >>>> additional PDUs which need to be received/processed by IS-IS - and = this >> has >>>> some impact. But I think it is reasonable to expect that an >> implementation >>>> which can support sending and receiving LSPs at a faster rate = should also >> be >>>> able to send/receive PSNPs at a faster rate. But we still need to = be >> smarter >>>> than sending one PSNP/one LSP in cases where we have a burst. >>>>>=20 >>>>> LANs are a more difficult problem than P2P - and thus far draft- >> ginsberg-lsr- >>>> isis-flooding-scale has been silent on this - but not because we = aren't >> aware >>>> of this - just have focused on the P2P behavior first. >>>>> What the best behavior on a LAN may be is something I am still >> considering. >>>> Slowing flooding down to the speed at which the slowest IS on the = LAN >> can >>>> support may not be the best strategy - as it also slows down the >> propagation >>>> rate for systems downstream from the nodes on the LAN which can >> handle >>>> faster flooding - thereby having an impact on flooding speed = throughout >> the >>>> network in a way which may be out of proportion. This is a smaller >> example >>>> of the larger issue that when only some nodes in the network = support >> faster >>>> flooding the behavior of the whole network may not be "better" when >> faster >>>> flooding is enabled because it prolongs the period of LSDB = inconsistency. >>>> More work needs to be done here... >>>>>=20 >>>>> In summary, I don't expect to have to "reinvent TCP" - but I do = think >> you >>>> have provided a useful perspective for us to consider as we = progress on >> this >>>> topic, >>>>>=20 >>>>> Thanx. >>>>>=20 >>>>> Les >>>>>=20 >>>>>=20 >>>>>> -----Original Message----- >>>>>> From: Lsr On Behalf Of Henk Smit >>>>>> Sent: Thursday, April 30, 2020 6:58 AM >>>>>> To: lsr@ietf.org >>>>>> Subject: [Lsr] Why only a congestion-avoidance algorithm on the >> sender >>>> isn't >>>>>> enough >>>>>>=20 >>>>>>=20 >>>>>> Hello all, >>>>>>=20 >>>>>> Two years ago, Gunter Van de Velde and myself published this = draft: >>>>>> = https://tools.ietf.org/html/draft-hsmit-lsr-isis-flooding-over-tcp-00 >>>>>> That started this discussion about flow/congestion control and = ISIS >>>>>> flooding. >>>>>>=20 >>>>>> My thoughts were that once we start implementing new algorithms >> to >>>>>> optimize ISIS flooding speed, we'll end up with our own version = of >> TCP. >>>>>> I think most people here have a good general understanding of = TCP. >>>>>> But if not, this is a good overview how TCP does it: >>>>>> https://en.wikipedia.org/wiki/TCP_congestion_control >>>>>>=20 >>>>>>=20 >>>>>> What does TCP do: >>>>>> =3D=3D=3D=3D >>>>>> TCP does 2 things: flow control and congestion control. >>>>>>=20 >>>>>> 1) Flow control is: the receiver trying to prevent itself from = being >>>>>> overloaded. The receiver indicates, through the = receiver-window-size >>>>>> in the TCP acks, how much data it can or wants to receive. >>>>>> 2) Congestion control is: the sender trying to prevent the links >> between >>>>>> sender and receiver from being overloaded. The sender makes an >>>> educated >>>>>> guess at what speed it can send. >>>>>>=20 >>>>>>=20 >>>>>> The part we seem to be missing: >>>>>> =3D=3D=3D=3D >>>>>> For the sender to make a guess at what speed it can send, it = looks at >>>>>> how the transmission is behaving. Are there drops ? What is the = RTT ? >>>>>> Do drop-percentage and RTT change ? Do acks come in at the same >> rate >>>>>> as the sender sends segments ? Are there duplicate acks ? To be = able >>>>>> to do this, the sender must know what to expect. How acks behave. >>>>>>=20 >>>>>> If you want an ISIS sender to make a guess at what speed it can = send, >>>>>> without changing the protocol, the only thing the sender can do = is >> look >>>>>> at the PSNPs that come back from the receiver. But the RTT of = PSNPs >> can >>>>>> not be predicted. Because a good ISIS implementation does not >>>>>> immediately >>>>>> send a PSNP when it receives a LSP. 1) the receiver should jitter = the >>>>>> PSNP, >>>>>> like it should jitter all packets. And 2) the receiver should = wait a >>>>>> little >>>>>> to see if it can combine multiple acks into a single PSNP packet. >>>>>>=20 >>>>>> In TCP, if a single segment gets lost, each new segment will = cause the >>>>>> receiver to send an ack with the seqnr of the last received byte. = This >>>>>> is called "duplicate acks". This triggers the sender to do >>>>>> fast-retransmission. In ISIS, this can't be be done. The = information >>>>>> a sender can get from looking at incoming PSNPs is a lot less = than >> what >>>>>> TCP can learn from incoming acks. >>>>>>=20 >>>>>>=20 >>>>>> The problem with sender-side congestion control: >>>>>> =3D=3D=3D=3D >>>>>> In ISIS, all we know is that the default retransmit-interval is 5 >>>>>> seconds. >>>>>> And I think most implementations use that as the default. This = means >>>>>> that >>>>>> the receiver of an LSP has one requirement: send a PSNP within 5 >>>>>> seconds. >>>>>> For the rest, implementations are free to send PSNPs however and >>>>>> whenever >>>>>> they want. This means a sender can not really make conclusions = about >>>>>> flooding speed, dropped LSPs, capacity of the receiver, etc. >>>>>> There is no ordering when flooding LSPs, or sending PSNPs. This >> makes >>>>>> a sender-side algorithm for ISIS a lot harder. >>>>>>=20 >>>>>> When you think about it, you realize that a sender should wait = the >>>>>> full 5 seconds before it can make any real conclusions about = dropped >>>>>> LSPs. >>>>>> If a sender looks at PSNPs to determine its flooding speed, it = will >>>>>> probably >>>>>> not be able to react without a delay of a few seconds. A sender = might >>>>>> send >>>>>> hunderds or thousands of LSPs in those 5 seconds, which might all = or >>>>>> partially be dropped, complicating matters even further. >>>>>>=20 >>>>>>=20 >>>>>> A sender-sider algorithm should specify how to do PSNPs. >>>>>> =3D=3D=3D=3D >>>>>> So imho a sender-side only algorithm can't work just like that in = a >>>>>> multi-vendor environment. We must not only specify a congestion- >>>> control >>>>>> algorithm for the sender. We must also specify for the receiver a >> more >>>>>> specific algorithm how and when to send PSNPs. At least how to do >>>> PSNPs >>>>>> under load. >>>>>>=20 >>>>>> Note that this might result in the receiver sending more (and = smaller) >>>>>> PSNPs. >>>>>> More packets might mean more congestion (inside routers). >>>>>>=20 >>>>>>=20 >>>>>> Will receiver-side flow-control work ? >>>>>> =3D=3D=3D=3D >>>>>> I don't know if that's enough. It will certainly help. >>>>>>=20 >>>>>> I think to tackle this problem, we need 3 parts: >>>>>> 1) sender-side congestion-control algorithm >>>>>> 2) more detailed algorithm on receiver when and how to send PSNPs >>>>>> 3) receiver-side flow-control mechanism >>>>>>=20 >>>>>> As discussed at length, I don't know if the ISIS process on the >>>>>> receiving >>>>>> router can actually know if its running out of resources (buffers = on >>>>>> interfaces, linecards, etc). That's implementation dependent. A >> receiver >>>>>> can definitely advertise a fixed value. So the sender has an = upper >> bound >>>>>> to use when doing congestion-control. Just like TCP has both a >>>>>> flow-control >>>>>> window and a congestion-control window, and a sender uses both. >>>> Maybe >>>>>> the >>>>>> receiver can even advertise a dynamic value. Maybe now, maybe = only >> in >>>>>> the >>>>>> future. An advertised upper limit seems useful to me today. >>>>>>=20 >>>>>>=20 >>>>>> What I didn't like about our own proposal (flooding over TCP): >>>>>> =3D=3D=3D=3D >>>>>> The problem I saw with flooding over TCP concerns multi-point >> networks >>>>>> (LANs). >>>>>>=20 >>>>>> When flooding over a multi-point network, setting up TCP >> connections >>>>>> introduces serious challenges. Who are the endpoints of the TCP >>>>>> connections ? >>>>>> Full mesh ? Or do all ISes on a LAN create a TCP-connection to = the DIS >> ? >>>>>> There is no backup DIS in ISIS (unlike OSPF). Things get messy = quickly. >>>>>>=20 >>>>>> However, the other two proposals do not solve this problem = either. >>>>>> How will a sender-side congestion-avoidence algorithm determine >>>> whether >>>>>> there were drops ? There are no acks (PSNPs) on a LAN. We assume >> most >>>>>> LSPs >>>>>> that are broadcasted are received by all other ISes on the LAN. = There >>>>>> are >>>>>> no acks. Only after the DIS has sent its periodic CSNPs, ISes can = send >>>>>> PSNPs to request retransmissions. It seems impossible (or very = hard) >> to >>>>>> me for all ISes on a LAN to keep track of dropped LSPs and adjust = their >>>>>> sending speed accordingly.. >>>>>>=20 >>>>>> When flooding on a LAN, the receiver-side algorithm seems best. >>>> Because >>>>>> all ISes can see what the lowest advertised sending-speed is. And >> make >>>>>> sure they send slow enough to not overload the slowest IS. I'm = not >> sure >>>>>> this is a good solution, but is seems easier and more realistic = than >>>>>> ISIS-flooding-over-TCP or sender-side congestion-avoidance. >>>>>>=20 >>>>>>=20 >>>>>> My conclusion: >>>>>> =3D=3D=3D=3D >>>>>> Sender-side congestion-control won't work without specifying in >> more >>>>>> detail how and when to send PSNPs. >>>>>> Receiver-side flow-control will certainly help. I dont' know if = it's >>>>>> good enough. I don't know if advertising a static value is good = enough. >>>>>> But it's a start. >>>>>>=20 >>>>>> I still think we'll end up re-implementing a new (and weaker) = TCP. >>>>>>=20 >>>>>>=20 >>>>>> henk. >>>>>>=20 >>>>>> _______________________________________________ >>>>>> Lsr mailing list >>>>>> Lsr@ietf.org >>>>>> https://www.ietf.org/mailman/listinfo/lsr >>>>>=20 >>>>> _______________________________________________ >>>>> Lsr mailing list >>>>> Lsr@ietf.org >>>>> https://www.ietf.org/mailman/listinfo/lsr >>>>=20 >>>>=20 >> __________________________________________________________ >>>>=20 >> __________________________________________________________ >>>> _____ >>>>=20 >>>> Ce message et ses pieces jointes peuvent contenir des informations >>>> confidentielles ou privilegiees et ne doivent donc >>>> pas etre diffuses, exploites ou copies sans autorisation. Si vous = avez recu >> ce >>>> message par erreur, veuillez le signaler >>>> a l'expediteur et le detruire ainsi que les pieces jointes. Les = messages >>>> electroniques etant susceptibles d'alteration, >>>> Orange decline toute responsabilite si ce message a ete altere, = deforme >> ou >>>> falsifie. Merci. >>>>=20 >>>> This message and its attachments may contain confidential or = privileged >>>> information that may be protected by law; >>>> they should not be distributed, used or copied without = authorisation. >>>> If you have received this email in error, please notify the sender = and >> delete >>>> this message and its attachments. >>>> As emails may be altered, Orange is not liable for messages that = have >> been >>>> modified, changed or falsified. >>>> Thank you. >>>=20 >>>=20 >> __________________________________________________________ >> __________________________________________________________ >> _____ >>>=20 >>> Ce message et ses pieces jointes peuvent contenir des informations >> confidentielles ou privilegiees et ne doivent donc >>> pas etre diffuses, exploites ou copies sans autorisation. Si vous = avez recu ce >> message par erreur, veuillez le signaler >>> a l'expediteur et le detruire ainsi que les pieces jointes. Les = messages >> electroniques etant susceptibles d'alteration, >>> Orange decline toute responsabilite si ce message a ete altere, = deforme ou >> falsifie. Merci. >>>=20 >>> This message and its attachments may contain confidential or = privileged >> information that may be protected by law; >>> they should not be distributed, used or copied without = authorisation. >>> If you have received this email in error, please notify the sender = and delete >> this message and its attachments. >>> As emails may be altered, Orange is not liable for messages that = have been >> modified, changed or falsified. >>> Thank you. >>>=20 >> __________________________________________________________ >> __________________________________________________________ >> _____ >>>=20 >>> Ce message et ses pieces jointes peuvent contenir des informations >> confidentielles ou privilegiees et ne doivent donc >>> pas etre diffuses, exploites ou copies sans autorisation. Si vous = avez recu ce >> message par erreur, veuillez le signaler >>> a l'expediteur et le detruire ainsi que les pieces jointes. Les = messages >> electroniques etant susceptibles d'alteration, >>> Orange decline toute responsabilite si ce message a ete altere, = deforme ou >> falsifie. 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DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, UNPARSEABLE_RELAY=0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=orange.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id g_mT3fWJQZzU for ; Wed, 6 May 2020 10:09:44 -0700 (PDT) Received: from relais-inet.orange.com (relais-inet.orange.com [80.12.66.39]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 28B753A0827 for ; Wed, 6 May 2020 10:09:44 -0700 (PDT) Received: from opfedar01.francetelecom.fr (unknown [xx.xx.xx.2]) by opfedar23.francetelecom.fr (ESMTP service) with ESMTP id 49HNPL48yzzBrZC; Wed, 6 May 2020 19:09:42 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=orange.com; s=ORANGE001; t=1588784982; bh=O5jjwabukbvHgIWZm7h4qnuI0M96COZBjW4MuxeOntk=; h=From:To:Subject:Date:Message-ID:Content-Type: Content-Transfer-Encoding:MIME-Version; b=EDBXQpqfBPbVXCvs1QLz6P0UPoRJDGhYieEnGWaC7pDWA8nInoPqOXwG5AXmFzprZ zt+EP6usersMT2UsrJSoyARLdPs5wcA79CL56fKoFgzqLMD+mVoouF8OQoO4ZfWZUl yc/TYwN0skQf4vrlJHThYXc0Rq9XxFyV49Tf7ExRyMcgju4Szkl4jHOnx1iwMknZxP nzCIdN1/qbZoWHoNFZVLoHOpZKTPh9KOL3/GEgUQ0yTDdFpS9szskffSVs56lSE+B2 WSAeZQTVwKvHZh2C+ngy7AAhH+uIwzJITJeGMD3YxyrnLXavACfAxZikSnVhWfl7jT D9E4rNxtVgj+w== Received: from Exchangemail-eme6.itn.ftgroup (unknown [xx.xx.13.60]) by opfedar01.francetelecom.fr (ESMTP service) with ESMTP id 49HNPL38yNzBrLd; Wed, 6 May 2020 19:09:42 +0200 (CEST) From: To: Christian Hopps CC: "Les Ginsberg (ginsberg)" , "lsr@ietf.org" Thread-Topic: [Lsr] Flooding across a network Thread-Index: AQHWI7Vo0U1m8UmYwUOJOulEHUPDuqibRt8g Date: Wed, 6 May 2020 17:09:41 +0000 Message-ID: <9992_1588784982_5EB2EF56_9992_201_1_53C29892C857584299CBF5D05346208A48E40256@OPEXCAUBM43.corporate.adroot.infra.ftgroup> References: <24209_1588692477_5EB185FD_24209_35_1_53C29892C857584299CBF5D05346208A48E3D455@OPEXCAUBM43.corporate.adroot.infra.ftgroup> <6287_1588771252_5EB2B9B4_6287_332_1_53C29892C857584299CBF5D05346208A48E3F698@OPEXCAUBM43.corporate.adroot.infra.ftgroup> <10562_1588775602_5EB2CAB2_10562_251_11_53C29892C857584299CBF5D05346208A48E3FB63@OPEXCAUBM43.corporate.adroot.infra.ftgroup> <87CDE7F3-E08D-4C45-9AF1-9DAD635F8908@chopps.org> In-Reply-To: <87CDE7F3-E08D-4C45-9AF1-9DAD635F8908@chopps.org> Accept-Language: fr-FR, en-US Content-Language: fr-FR X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.114.13.245] Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 MIME-Version: 1.0 Archived-At: Subject: Re: [Lsr] Flooding across a network X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 06 May 2020 17:09:48 -0000 PiBGcm9tOiBDaHJpc3RpYW4gSG9wcHMgW21haWx0bzpjaG9wcHNAY2hvcHBzLm9yZ10gDQo+IA0K PiBCcnVubyBwZXJzaXN0ZW5jZSBoYXMgbWFkZSBtZSByZWFsaXplIHNvbWV0aGluZyBmdW5kYW1l bnRhbCBoZXJlLg0KPiANCj4gVGhlIG1pbnV0ZSB0aGUgTFNQIG9yaWdpbmF0b3IgY2hhbmdlcyB0 aGUgTFNQIGFuZCBmbG9vZHMgaXQgeW91IGhhdmUgTFNEQiBpbmNvbnNpc3RlbmN5LiANCg0KRXhh Y3RseSBteSBwb2ludC4gVGhhbmsgeW91IENocmlzLg0KSSB3b3VsZCBldmVuIHNheTogIlRoZSBt aW51dGUgdGhlIExTUCBvcmlnaW5hdG9yIGNoYW5nZXMgdGhlIExTUCB0aGVuIHlvdSBoYXZlIExT REIgaW5jb25zaXN0ZW5jeS4iIEJ1dCBubyBiaWcgZGVhbCBpZiB0aGVyZSBpcyBkaXNhZ3JlZW1l bnQgb24gdGhpcyBkZXRhaWwuDQoNCj4gVGhhdCBpcyBnb2luZyB0byBsYXN0IHVudGlsIHRoZSBs YXN0IG5vZGUgaW4gdGhlIG5ldHdvcmsgaGFzIHVwZGF0ZWQgaXQncyBMU0RCLg0KDQpBYnNvbHV0 ZWx5Lg0KU28gdGhlIGZhc3RlciB3ZSBmbG9vZCwgdGhlIHNob3J0ZXIgdGhlIExTQkQgaW5jb25z aXN0ZW5jeS4NCg0KTm93IElNTywgZXZlbiBpZiBhIHNpbmdsZS9mZXcgbm9kZXMgZmxvb2QgZmFz 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Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=joelhalpern.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id pu3S2KHTWmu6 for ; Wed, 6 May 2020 11:19:30 -0700 (PDT) Received: from mailb2.tigertech.net (mailb2.tigertech.net [208.80.4.154]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 6E2C93A09FD for ; Wed, 6 May 2020 11:19:30 -0700 (PDT) Received: from localhost (localhost [127.0.0.1]) by mailb2.tigertech.net (Postfix) with ESMTP id 49HPxt1v83z1p3MF; Wed, 6 May 2020 11:19:30 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=joelhalpern.com; s=2.tigertech; t=1588789170; bh=uEBibSQYQh/F81vcesCC0mJShHgo6ebFd8JWFIz3cP4=; h=Subject:To:Cc:References:From:Date:In-Reply-To:From; b=FeH2aI1/UIgkHlZvLgKJ814BLq+MJxyUYbnhJibgR66/QlX8QPIVlfUPJTfQeimug lENoqV3qpULecbNnfj97wfKkZT+GI+ZUoWjb38AzqVPp/CXxNO3+KGVcv6zl20KPRy rTdcrNd4b+umNZ2VpyTP+9dfL0qxnxtwmkRpxLGI= X-Virus-Scanned: Debian amavisd-new at b2.tigertech.net Received: from [192.168.128.43] (209-255-163-147.ip.mcleodusa.net [209.255.163.147]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mailb2.tigertech.net (Postfix) with ESMTPSA id 49HPxs3YX1z1nylD; Wed, 6 May 2020 11:19:29 -0700 (PDT) To: "Les Ginsberg (ginsberg)" Cc: "lsr@ietf.org" References: <24209_1588692477_5EB185FD_24209_35_1_53C29892C857584299CBF5D05346208A48E3D455@OPEXCAUBM43.corporate.adroot.infra.ftgroup> <6287_1588771252_5EB2B9B4_6287_332_1_53C29892C857584299CBF5D05346208A48E3F698@OPEXCAUBM43.corporate.adroot.infra.ftgroup> <10562_1588775602_5EB2CAB2_10562_251_11_53C29892C857584299CBF5D05346208A48E3FB63@OPEXCAUBM43.corporate.adroot.infra.ftgroup> <87CDE7F3-E08D-4C45-9AF1-9DAD635F8908@chopps.org> <9992_1588784982_5EB2EF56_9992_201_1_53C29892C857584299CBF5D05346208A48E40256@OPEXCAUBM43.corporate.adroot.infra.ftgroup> From: "Joel M. Halpern" Message-ID: <8f25568b-cb57-7714-1e16-71c257aae0b2@joelhalpern.com> Date: Wed, 6 May 2020 14:19:26 -0400 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:68.0) Gecko/20100101 Thunderbird/68.7.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit Archived-At: Subject: Re: [Lsr] Flooding across a network X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 06 May 2020 18:19:37 -0000 Les, maybe I am missing your point, but it sounds like what you are asking for is a (better?) version of the micro-loop prevention work, so as to mitigate the interaction between inconsistent convergence and fast-reroute? Yours, Joel On 5/6/2020 1:53 PM, Les Ginsberg (ginsberg) wrote: > Bruno - > > I am sorry it has been so difficult for us to understand each other. I am trying my best. > > Look at it this way: > > You are the customer. 😊 > I am the vendor. > > The failure scenario I describe below happens and you notice that all Northbound destinations loop for 35 seconds whenever fast flooding is enabled. > I think you are going to complain about this - to me. 😊 > > And I am going to tell you that this is a consequence of enabling fast flooding in the presence of a node which does not support it. Your options to reduce the period of looping will be: > > 1)Upgrade the slow node to support faster flooding > 2)Disable fast flooding > 3)Redesign your network > > Les > >> -----Original Message----- >> From: bruno.decraene@orange.com >> Sent: Wednesday, May 06, 2020 10:10 AM >> To: Christian Hopps >> Cc: Les Ginsberg (ginsberg) ; lsr@ietf.org >> Subject: RE: [Lsr] Flooding across a network >> >>> From: Christian Hopps [mailto:chopps@chopps.org] >>> >>> Bruno persistence has made me realize something fundamental here. >>> >>> The minute the LSP originator changes the LSP and floods it you have LSDB >> inconsistency. >> >> Exactly my point. Thank you Chris. >> I would even say: "The minute the LSP originator changes the LSP then you >> have LSDB inconsistency." But no big deal if there is disagreement on this >> detail. >> >>> That is going to last until the last node in the network has updated it's LSDB. >> >> Absolutely. >> So the faster we flood, the shorter the LSBD inconsistency. >> >> Now IMO, even if a single/few nodes flood faster, there is a chance of >> shortening the LSDB inconsistency. But in all cases, I don't see how this could >> make the LSDB inconsistency longer. >> >> >>> Les is pointing out that LSDB inconsistency can be bad in certain >> circumstances e.g., if a critical node is slow and thus inconsistent. >>> >>> I believe the right way to fix this is a simple one, help the operator flag the >> broken router software/hardware for replacement, but otherwise IS-IS >> should just try to do the best job it can do to which is to flood around the >> problem (i.e., flood as optimally as possible). >> >> +1 >> On a side note, I would not call a router flooding slowly as "broken". I find it >> understandable that in a given network there are different type of routers >> (core vs aggregation), different roles (P having 50 IGP adjacencies with 50 PEs >> vs PE having only 2 IGP adjacencies with 2 P), different hardware >> generations, different software, different vendors with different >> perspectives/markets. >> >> Thank you Chris. >> >> --Bruno >>> >>> Thanks, >>> Chris. >>> [as WG member] >>> >>> >>>> On May 6, 2020, at 10:33 AM, bruno.decraene@orange.com wrote: >>>> >>>> Les, >>>> >>>> From: Les Ginsberg (ginsberg) [mailto:ginsberg@cisco.com] >>>> Sent: Wednesday, May 6, 2020 4:14 PM >>>> To: DECRAENE Bruno TGI/OLN >>>> Cc: lsr@ietf.org >>>> Subject: RE: Flooding across a network >>>> >>>> Bruno – >>>> >>>> I am somewhat at a loss to understand your comments. >>>> The example is straightforward and does not need to consider FIB update >> time nor the ordering of prefix updates on different nodes. >>>> [Bruno] The example is straightforward but you are referring to FIB and IP >> packets forwarding as per those FIBs. >>>> I’d like we focus on LSP flooding and LSDB consistency. >>>> >>>> Consider the state of Node B and Node D at various time points from the >> trigger event. >>>> >>>> T+ 2 seconds: >>>> ----------------- >>>> B has received all LSP Updates. It triggers an SPF and for all Northbound >> destinations previously reachable via C it installs paths via D. >>>> Let’s assume it take 5 seconds to update the forwarding plane. >>>> >>>> D has received 40 of the 1000 LSP updates. It triggers an SPF and finds >> that all Northbound destinations are reachable via B-C. It makes no changes >> to the forwarding plane. >>>> >>>> T+7 seconds >>>> ----------------- >>>> B has completed FIB updates. Traffic to all Northbound destinations is >> being forwarded via D. >>>> >>>> D has now received 140 of the 1000 LSP updates. Entries in its forwarding >> plane for Northbound destinations still point to B. >>>> >>>> We have a loop. >>>> >>>> T + 30 seconds >>>> -------------------- >>>> D has now received 600 of the 1000 LSP updates. Still no changes to its >> forwarding plane. >>>> Traffic to Northbound destinations is still looping. >>>> >>>> T+ 50 seconds >>>> ------------------- >>>> D has finally received all 1000 LSP updates.. >>>> It triggers (another) SPF and calculates paths to Northbound destinations >> via E. It begins to update its forwarding plane. >>>> Let’s assume this will take 5 seconds.. >>>> >>>> T + 55 seconds >>>> -------------------- >>>> D has completed forwarding plane updates – no more looping. >>>> >>>> That is all I am trying to illustrate. >>>> >>>> If you want to start arguing that node protecting LFAs + microloop >> avoidance could help (NOTE I explicitly took those out of the example for >> simplicity) – it is easy enough to change the example to include multiple node >> failures or a node failure plus some northbound link failures on other nodes. >>>> [Bruno] I’m not talking about LFA/FRR. And with regards to microloops >> avoidance, some algorithms can handle any graph transition so including >> multiple node failures. >>>> >>>> But again, let’s stick to LSP flooding and LSDB consistency. (you are the >> one speaking about microloops in the forwarding plane). >>>> >>>> The point here is to look at the impact of long-lived LSDB inconsistency >> which results when some nodes support flooding an order of magnitude >> faster flooding than other nodes – which is what you asked me to clarify. >>>> [Bruno] No. I asked you to clarify why having a node with faster flooding >> could prolongs the period of LSDB inconsistency. >>>> >>>> Again, with you own words: “when only some nodes in the network >> support faster flooding the behavior of the whole network may not be >> "better" when faster flooding is enabled because it prolongs the period of >> LSDB inconsistency.” >>>> And with less words: “when only some nodes in the network support >> faster flooding […] it prolongs the period of LSDB inconsistency.” >>>> >>>> --Bruno >>>> >>>> Les >>>> >>>> >>>> >>>> From: bruno.decraene@orange.com >>>> Sent: Wednesday, May 06, 2020 6:21 AM >>>> To: Les Ginsberg (ginsberg) >>>> Cc: lsr@ietf.org >>>> Subject: RE: Flooding across a network >>>> >>>> Les, >>>> >>>> From: Les Ginsberg (ginsberg) [mailto:ginsberg@cisco.com] >>>> Sent: Wednesday, May 6, 2020 1:35 AM >>>> To: DECRAENE Bruno TGI/OLN; lsr@ietf..org >>>> Subject: RE: Flooding across a network >>>> >>>> Bruno - >>>> >>>> Seems like it was not too long ago that we were discussing this in person. >> Ahhh...the good old days... >>>> [Bruno] Indeed, may be not to the point of concluding. Indeed. >>>> >>>> First, let's agree that the interesting case does not involve 1 or even a >> small number of LSPs. For those cases flooding speed does not matter. >>>> The interesting cases involve a large number of LSPs (hundreds or >> thousands). And in such cases LFA/microloop avoidance techniques are not >> applicable. >>>> >>>> Take the following simple topology: >>>> >>>> | | ... | | >>>> +---+ +---+ >>>> | C | | E | >>>> +---+ +---+ >>>> | | 1000 >>>> +---+ +---+ >>>> | B |-------------| D | >>>> +---+ 1000 +---+ >>>> | | >>>> | | >>>> \ / >>>> \ / >>>> \ / >>>> \ / >>>> +---+ >>>> | A | >>>> +---+ >>>> >>>> There is a topology northbound of C and E (not shown) and a topology >> southbound of A (not shown). >>>> Cost on all links is 10 except B-D and D-E where cost is high. >>>> >>>> C is a node with 1000 neighbors. >>>> When all links are up, shortest path for all northbound destinations is via >> C. >>>> All nodes in the network support fast flooding except for Node D. >>>> Let’s say fast flooding is 500 LSPs/second and slow flooding (Node D) is 20 >> LSPs/seconds. >>>> If Node C fails we have 1000 LSPs to flood. >>>> All nodes except for D can receive these in 2 seconds (plus internode >> delay time). >>>> D can receive LSPs in 50 seconds. >>>> >>>> [Bruno] Thanks for your example. Agreed so far. >>>> >>>> When A and B and all southbound nodes receive/process the LSP >> updates they will start sending traffic to Northbound destinations via D. >>>> But for the better part of 50 seconds, Node D has yet to receive all LSP >> updates and still believes that shortest path is via B-C. It will loop traffic. >>>> >>>> [Bruno] May I remind you that we are discussing IS-IS flooding in order to >> sync LSDB (LSP database). That is already a big enough subject. It does not >> including FIB (updates), nor IP forwarding. >>>> >>>> Quoting you “when only some nodes in the network support faster >> flooding the behavior of the whole network may not be "better" when faster >> flooding is enabled because it prolongs the period of LSDB inconsistency.” >>>> >>>> Taking your own examples, in both cases (all nodes support fast flooding; >> all nodes but D support fast flooding) the period of LSDB inconsistency is 50 >> seconds. Hence this example does not illustrate your statement. >>>> >>>> Hence I’m restating my questions: >>>> >>>>>> when only some nodes in the network support faster flooding the >> behavior >>>>> of the whole network may not be "better" when faster flooding is >> enabled >>>>> because it prolongs the period of LSDB inconsistency. >>>>> >>>>> 1) Do you have data on this? >>>>> >>>>> 2) If not, can you provide an example where increasing the flooding >> rate on >>>>> one adjacency prolongs the period of LSDB inconsistency across the >>>>> network? >>>> >>>> >>>> Had all nodes used slow flooding, it still would have taken 50 seconds to >> converge, but there would be significantly less looping. There could be a >> good amount of blackholing, but this is preferable to looping. >>>> [Bruno] You are using an example where ordering FIB updates across the >> network, e.g. as per [1], allows to reduce _FIB_ inconsistency across the >> path/network. And you seem to conclude from this that this translates to >> LSDB update ordering. Those are two different things. In this thread, I’d >> suggest that we focus on IGP flooding and LSDB sync only. (*) >>>> [1] https://tools.ietf.org/html/rfc6976 >>>> (*) We can discuss loop free IGP converge in a different thread if you >> want. IMO, the use of segment routing/source routing is better than oFIB. >> But at some point, it still relies on fast flooding when multiple LSPs are >> involved. (and I mean _fast_ not _ordered_) >>>> >>>> --Bruno >>>> >>>> One can always come up with examples – based on a specific topology >> and a specific failure - where things might be better/worse/unchanged in the >> face of inconsistent flooding speed support. >>>> But I hope this simple example illustrates the pitfalls. >>>> >>>> Les >>>> >>>>> -----Original Message----- >>>>> From: bruno.decraene@orange.com >>>>> Sent: Tuesday, May 05, 2020 8:28 AM >>>>> To: Les Ginsberg (ginsberg) ; lsr@ietf.org >>>>> Subject: Flooding across a network >>>>> >>>>> Les, >>>>> >>>>>> From: Lsr [mailto:lsr-bounces@ietf.org] On Behalf Of Les Ginsberg >>>>> (ginsberg) >>>>>> Sent: Monday, May 4, 2020 4:39 PM >>>>> [...] >>>>>> when only some nodes in the network support faster flooding the >> behavior >>>>> of the whole network may not be "better" when faster flooding is >> enabled >>>>> because it prolongs the period of LSDB inconsistency. >>>>> >>>>> 1) Do you have data on this? >>>>> >>>>> 2) If not, can you provide an example where increasing the flooding >> rate on >>>>> one adjacency prolongs the period of LSDB inconsistency across the >>>>> network? >>>>> >>>>> 3) In the meantime, let's try the theoretical analysis on a simple >> scenario >>>>> where a single LSP needs to be flooded across the network. >>>>> >>>>> - Let's call Dij the time needed to flood the LSP from node i to the >> adjacent >>>>> node j. Clearly Dij>0. >>>>> - Let's call k the node originating this LSP at t0=0s >>>>> >>>>> >From t0, the LSDB is inconsistent across the network as all nodes but k >> are >>>>> missing the LSP and hence only know about the 'old' topology. >>>>> >>>>> Let's call SPT(k) the SPT rooted on k, using Dij as the metric between >>>>> adjacent nodes i and j. Let's call SP(k,i) the shortest path from k to i; and >>>>> D(k,i) the shortest distance between k and i. >>>>> >>>>> It seems that the time needed: >>>>> - for node j to learn about the LSP, and get in sync with k, is D(k,j) >>>>> - for all nodes across the network to learn about the LSP, and get in sync >> with >>>>> k, is Max[for all j] D(k,j) >>>>> >>>>> Then how can reducing the flooding delay on one adjacency could >> prolongs >>>>> the period of LSDB inconsistency? >>>>> It seems to me that it can only improve/decrease it. Otherwise, this >> would >>>>> mean that decreasing the cost on a link can increase the cost of the >> shortest >>>>> path. >>>>> >>>>> Note: I agree that there are other cases, such as multiple LSPs >> originated by >>>>> the same node, and multiple LSPs originated by multiple nodes, but >> let's start >>>>> with the simple case. >>>>> >>>>> Thanks, >>>>> --Bruno >>>>> >>>>>> -----Original Message----- >>>>>> From: Lsr [mailto:lsr-bounces@ietf.org] On Behalf Of Les Ginsberg >>>>> (ginsberg) >>>>>> Sent: Monday, May 4, 2020 4:39 PM >>>>>> >>>>>> Henk - >>>>>> >>>>>> Thanx for your thoughtful posts. >>>>>> I have read your later posts on this thread as well - but decided to >> reply to >>>>> this one. >>>>>> Top posting for better readability. >>>>>> >>>>>> There is broad agreement that faster flooding is desirable. >>>>>> There are now two proposals as to how to address the issue - neither >> of >>>>> which is proposing to use TCP (or equivalent). >>>>>> >>>>>> I have commented on why IS-IS flooding requirements are >> significantly >>>>> different than that for which TCP is used. >>>>>> I think it is also useful to note that even the simple test case which >> Bruno >>>>> reported on in last week's interim meeting demonstrated that without >> any >>>>> changes to the protocol at all IS-IS was able to flood an order of >> magnitude >>>>> faster than it commonly does today. >>>>>> This gives me hope that we are looking at the problem correctly and >> will not >>>>> need "TCP". >>>>>> >>>>>> Introducing a TCP based solution requires: >>>>>> >>>>>> a)A major change to the adjacency formation logic >>>>>> >>>>>> b)Removal of the independence of the IS-IS protocol from the >> address >>>>> families whose reachability advertisements it supports - something >> which I >>>>> think is a great strength of the protocol - particularly in environments >> where >>>>> multiple address family support is needed >>>>>> >>>>>> I really don't want to do either of the above. >>>>>> >>>>>> Your comments regarding PSNP response times are quite correct - >> and >>>>> both of the draft proposals discuss this - though I agree more detail will >> be >>>>> required. >>>>>> It is intuitive that if you want to flood faster you also need to ACK >> faster - >>>>> and probably even retransmit faster when that is needed. >>>>>> The basic relationship between retransmit interval and PSNP interval >> is >>>>> expressed in ISO 10589: >>>>>> >>>>>> " partialSNPInterval - This is the amount of time between periodic >>>>> > action for transmission of Partial Sequence Number PDUs. >>>>> > It shall be less than minimumLSPTransmission-Interval." >>>>>> >>>>>> Of course ISO 10589 recommended values (2 seconds and 5 seconds >>>>> respectively) associated with a much slower flooding rate and >>>>> implementations I am aware of use values in this order of magnitude. >> These >>>>> numbers need to be reduced if we are to flood faster, but the >> relationship >>>>> between the two needs to remain the same. >>>>>> >>>>>> It is also true - as you state - that sending ACKs more quickly will result >> in >>>>> additional PDUs which need to be received/processed by IS-IS - and this >> has >>>>> some impact. But I think it is reasonable to expect that an >> implementation >>>>> which can support sending and receiving LSPs at a faster rate should >> also be >>>>> able to send/receive PSNPs at a faster rate. But we still need to be >> smarter >>>>> than sending one PSNP/one LSP in cases where we have a burst. >>>>>> >>>>>> LANs are a more difficult problem than P2P - and thus far draft- >> ginsberg-lsr- >>>>> isis-flooding-scale has been silent on this - but not because we aren't >> aware >>>>> of this - just have focused on the P2P behavior first. >>>>>> What the best behavior on a LAN may be is something I am still >> considering. >>>>> Slowing flooding down to the speed at which the slowest IS on the LAN >> can >>>>> support may not be the best strategy - as it also slows down the >> propagation >>>>> rate for systems downstream from the nodes on the LAN which can >> handle >>>>> faster flooding - thereby having an impact on flooding speed >> throughout the >>>>> network in a way which may be out of proportion. This is a smaller >> example >>>>> of the larger issue that when only some nodes in the network support >> faster >>>>> flooding the behavior of the whole network may not be "better" when >> faster >>>>> flooding is enabled because it prolongs the period of LSDB >> inconsistency. >>>>> More work needs to be done here... >>>>>> >>>>>> In summary, I don't expect to have to "reinvent TCP" - but I do think >> you >>>>> have provided a useful perspective for us to consider as we progress on >> this >>>>> topic, >>>>>> >>>>>> Thanx. >>>>>> >>>>> > Les >>>>>> >>>>>> >>>>>>> -----Original Message----- >>>>>>> From: Lsr On Behalf Of Henk Smit >>>>>>> Sent: Thursday, April 30, 2020 6:58 AM >>>>>>> To: lsr@ietf.org >>>>>>> Subject: [Lsr] Why only a congestion-avoidance algorithm on the >> sender >>>>> isn't >>>>>>> enough >>>>>>> >>>>>>> >>>>>>> Hello all, >>>>>>> >>>>>>> Two years ago, Gunter Van de Velde and myself published this >> draft: >>>>>>> https://tools.ietf.org/html/draft-hsmit-lsr-isis-flooding-over-tcp-00 >>>>>>> That started this discussion about flow/congestion control and ISIS >>>>>>> flooding. >>>>>>> >>>>>>> My thoughts were that once we start implementing new algorithms >> to >>>>>>> optimize ISIS flooding speed, we'll end up with our own version of >> TCP. >>>>>>> I think most people here have a good general understanding of TCP. >>>>>>> But if not, this is a good overview how TCP does it: >>>>>>> https://en.wikipedia.org/wiki/TCP_congestion_control >>>>>>> >>>>>>> >>>>>>> What does TCP do: >>>>>>> ==== >>>>>>> TCP does 2 things: flow control and congestion control. >>>>>>> >>>>>>> 1) Flow control is: the receiver trying to prevent itself from being >>>>>>> overloaded. The receiver indicates, through the receiver-window- >> size >>>>>>> in the TCP acks, how much data it can or wants to receive. >>>>>>> 2) Congestion control is: the sender trying to prevent the links >> between >>>>>>> sender and receiver from being overloaded. The sender makes an >>>>> educated >>>>>>> guess at what speed it can send. >>>>>>> >>>>>>> >>>>>>> The part we seem to be missing: >>>>>>> ==== >>>>>>> For the sender to make a guess at what speed it can send, it looks at >>>>>>> how the transmission is behaving. Are there drops ? What is the RTT >> ? >>>>>>> Do drop-percentage and RTT change ? Do acks come in at the same >> rate >>>>>>> as the sender sends segments ? Are there duplicate acks ? To be >> able >>>>>>> to do this, the sender must know what to expect. How acks behave. >>>>>>> >>>>>>> If you want an ISIS sender to make a guess at what speed it can >> send, >>>>>>> without changing the protocol, the only thing the sender can do is >> look >>>>>>> at the PSNPs that come back from the receiver. But the RTT of >> PSNPs can >>>>>>> not be predicted. Because a good ISIS implementation does not >>>>>>> immediately >>>>>>> send a PSNP when it receives a LSP. 1) the receiver should jitter the >>>>>>> PSNP, >>>>>>> like it should jitter all packets. And 2) the receiver should wait a >>>>>>> little >>>>>>> to see if it can combine multiple acks into a single PSNP packet. >>>>>>> >>>>>>> In TCP, if a single segment gets lost, each new segment will cause >> the >>>>>>> receiver to send an ack with the seqnr of the last received byte. This >>>>>>> is called "duplicate acks". This triggers the sender to do >>>>>>> fast-retransmission. In ISIS, this can't be be done. The information >>>>>>> a sender can get from looking at incoming PSNPs is a lot less than >> what >>>>>>> TCP can learn from incoming acks. >>>>>>> >>>>>>> >>>>>>> The problem with sender-side congestion control: >>>>>>> ==== >>>>>>> In ISIS, all we know is that the default retransmit-interval is 5 >>>>>>> seconds. >>>>>>> And I think most implementations use that as the default. This >> means >>>>>>> that >>>>>>> the receiver of an LSP has one requirement: send a PSNP within 5 >>>>>>> seconds. >>>>>>> For the rest, implementations are free to send PSNPs however and >>>>>>> whenever >>>>>>> they want. This means a sender can not really make conclusions >> about >>>>>>> flooding speed, dropped LSPs, capacity of the receiver, etc. >>>>>>> There is no ordering when flooding LSPs, or sending PSNPs. This >> makes >>>>>>> a sender-side algorithm for ISIS a lot harder. >>>>>>> >>>>>>> When you think about it, you realize that a sender should wait the >>>>>>> full 5 seconds before it can make any real conclusions about >> dropped >>>>>>> LSPs. >>>>>>> If a sender looks at PSNPs to determine its flooding speed, it will >>>>>>> probably >>>>>>> not be able to react without a delay of a few seconds. A sender >> might >>>>>>> send >>>>>>> hunderds or thousands of LSPs in those 5 seconds, which might all >> or >>>>>>> partially be dropped, complicating matters even further. >>>>>>> >>>>>>> >>>>>>> A sender-sider algorithm should specify how to do PSNPs. >>>>>>> ==== >>>>>>> So imho a sender-side only algorithm can't work just like that in a >>>>>>> multi-vendor environment. We must not only specify a congestion- >>>>> control >>>>>>> algorithm for the sender. We must also specify for the receiver a >> more >>>>>>> specific algorithm how and when to send PSNPs. At least how to do >>>>> PSNPs >>>>>>> under load. >>>>>>> >>>>>>> Note that this might result in the receiver sending more (and >> smaller) >>>>>>> PSNPs. >>>>>>> More packets might mean more congestion (inside routers). >>>>>>> >>>>>>> >>>>>>> Will receiver-side flow-control work ? >>>>>>> ==== >>>>>>> I don't know if that's enough. It will certainly help. >>>>>>> >>>>>>> I think to tackle this problem, we need 3 parts: >>>>>>> 1) sender-side congestion-control algorithm >>>>>>> 2) more detailed algorithm on receiver when and how to send >> PSNPs >>>>>>> 3) receiver-side flow-control mechanism >>>>>>> >>>>>>> As discussed at length, I don't know if the ISIS process on the >>>>>>> receiving >>>>>>> router can actually know if its running out of resources (buffers on >>>>>>> interfaces, linecards, etc). That's implementation dependent. A >> receiver >>>>>>> can definitely advertise a fixed value. So the sender has an upper >> bound >>>>>>> to use when doing congestion-control. Just like TCP has both a >>>>>>> flow-control >>>>>>> window and a congestion-control window, and a sender uses both. >>>>> Maybe >>>>>>> the >>>>>>> receiver can even advertise a dynamic value. Maybe now, maybe >> only in >>>>>>> the >>>>>>> future. An advertised upper limit seems useful to me today. >>>>>>> >>>>>>> >>>>>>> What I didn't like about our own proposal (flooding over TCP): >>>>>>> ==== >>>>>>> The problem I saw with flooding over TCP concerns multi-point >> networks >>>>>>> (LANs). >>>>>>> >>>>>>> When flooding over a multi-point network, setting up TCP >> connections >>>>>>> introduces serious challenges. Who are the endpoints of the TCP >>>>>>> connections ? >>>>>>> Full mesh ? Or do all ISes on a LAN create a TCP-connection to the >> DIS ? >>>>>>> There is no backup DIS in ISIS (unlike OSPF). Things get messy >> quickly. >>>>>>> >>>>>>> However, the other two proposals do not solve this problem either. >>>>>>> How will a sender-side congestion-avoidence algorithm determine >>>>> whether >>>>>>> there were drops ? There are no acks (PSNPs) on a LAN. We assume >> most >>>>>>> LSPs >>>>>>> that are broadcasted are received by all other ISes on the LAN. >> There >>>>>>> are >>>>>>> no acks. Only after the DIS has sent its periodic CSNPs, ISes can send >>>>>>> PSNPs to request retransmissions. It seems impossible (or very >> hard) to >>>>>>> me for all ISes on a LAN to keep track of dropped LSPs and adjust >> their >>>>>>> sending speed accordingly.. >>>>>>> >>>>>>> When flooding on a LAN, the receiver-side algorithm seems best. >>>>> Because >>>>>>> all ISes can see what the lowest advertised sending-speed is. And >> make >>>>>>> sure they send slow enough to not overload the slowest IS. I'm not >> sure >>>>>>> this is a good solution, but is seems easier and more realistic than >>>>>>> ISIS-flooding-over-TCP or sender-side congestion-avoidance. >>>>>>> >>>>>>> >>>>>>> My conclusion: >>>>>>> ==== >>>>>>> Sender-side congestion-control won't work without specifying in >> more >>>>>>> detail how and when to send PSNPs. >>>>>>> Receiver-side flow-control will certainly help. I dont' know if it's >>>>>>> good enough. I don't know if advertising a static value is good >> enough. >>>>>>> But it's a start. >>>>>>> >>>>>>> I still think we'll end up re-implementing a new (and weaker) TCP. >>>>>>> >>>>>>> >>>>>>> henk. >>>>>>> >>>>>>> _______________________________________________ >>>>>>> Lsr mailing list >>>>>>> Lsr@ietf.org >>>>>>> https://www.ietf.org/mailman/listinfo/lsr >>>>>> >>>>>> _______________________________________________ >>>>>> Lsr mailing list >>>>>> Lsr@ietf.org >>>>>> https://www.ietf.org/mailman/listinfo/lsr >>>>> >>>>> >> __________________________________________________________ >>>>> >> __________________________________________________________ >>>>> _____ >>>>> >>>>> Ce message et ses pieces jointes peuvent contenir des informations >>>>> confidentielles ou privilegiees et ne doivent donc >>>>> pas etre diffuses, exploites ou copies sans autorisation. 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Merci. >>>>> >>>>> This message and its attachments may contain confidential or privileged >>>>> information that may be protected by law; >>>>> they should not be distributed, used or copied without authorisation. >>>>> If you have received this email in error, please notify the sender and >> delete >>>>> this message and its attachments. >>>>> As emails may be altered, Orange is not liable for messages that have >> been >>>>> modified, changed or falsified. >>>>> Thank you. >>>> >>>> >> __________________________________________________________ >> __________________________________________________________ >> _____ >>>> >>>> Ce message et ses pieces jointes peuvent contenir des informations >> confidentielles ou privilegiees et ne doivent donc >>>> pas etre diffuses, exploites ou copies sans autorisation. Si vous avez recu >> ce message par erreur, veuillez le signaler >>>> a l'expediteur et le detruire ainsi que les pieces jointes. 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Merci. >>>> >>>> This message and its attachments may contain confidential or privileged >> information that may be protected by law; >>>> they should not be distributed, used or copied without authorisation. >>>> If you have received this email in error, please notify the sender and >> delete this message and its attachments. >>>> As emails may be altered, Orange is not liable for messages that have >> been modified, changed or falsified. >>>> Thank you. >>>> >>>> _______________________________________________ >>>> Lsr mailing list >>>> Lsr@ietf.org >>>> https://www.ietf.org/mailman/listinfo/lsr >>> >> >> __________________________________________________________ >> __________________________________________________________ >> _____ >> >> Ce message et ses pieces jointes peuvent contenir des informations >> confidentielles ou privilegiees et ne doivent donc >> pas etre diffuses, exploites ou copies sans autorisation. Si vous avez recu ce >> message par erreur, veuillez le signaler >> a l'expediteur et le detruire ainsi que les pieces jointes. Les messages >> electroniques etant susceptibles d'alteration, >> Orange decline toute responsabilite si ce message a ete altere, deforme ou >> falsifie. 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Wed, 6 May 2020 18:25:19 +0000 From: "Les Ginsberg (ginsberg)" To: "Joel M. Halpern" CC: "lsr@ietf.org" Thread-Topic: [Lsr] Flooding across a network Thread-Index: AdYi7bsxcCpCOCQDSjylEJ0cQECozgAREGJwAByiJrAAAl2gYAAA0u8gAAEHvYAABO66gAABUTNwAAEeagAAABs74A== Date: Wed, 6 May 2020 18:25:19 +0000 Message-ID: References: <24209_1588692477_5EB185FD_24209_35_1_53C29892C857584299CBF5D05346208A48E3D455@OPEXCAUBM43.corporate.adroot.infra.ftgroup> <6287_1588771252_5EB2B9B4_6287_332_1_53C29892C857584299CBF5D05346208A48E3F698@OPEXCAUBM43.corporate.adroot.infra.ftgroup> <10562_1588775602_5EB2CAB2_10562_251_11_53C29892C857584299CBF5D05346208A48E3FB63@OPEXCAUBM43.corporate.adroot.infra.ftgroup> <87CDE7F3-E08D-4C45-9AF1-9DAD635F8908@chopps.org> <9992_1588784982_5EB2EF56_9992_201_1_53C29892C857584299CBF5D05346208A48E40256@OPEXCAUBM43.corporate.adroot.infra.ftgroup> <8f25568b-cb57-7714-1e16-71c257aae0b2@joelhalpern.com> In-Reply-To: <8f25568b-cb57-7714-1e16-71c257aae0b2@joelhalpern.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: 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<6287_1588771252_5EB2B9B4_6287_332_1_53C29892C857584299CBF5D05346208A48E3F698@OPEXCAUBM43.corporate.adroot.infra.ftgroup> <10562_1588775602_5EB2CAB2_10562_251_11_53C29892C857584299CBF5D05346208A48E3FB63@OPEXCAUBM43.corporate.adroot.infra.ftgroup> <87CDE7F3-E08D-4C45-9AF1-9DAD635F8908@chopps.org> <9992_1588784982_5EB2EF56_9992_201_1_53C29892C857584299CBF5D05346208A48E40256@OPEXCAUBM43.corporate.adroot.infra.ftgroup> <8f25568b-cb57-7714-1e16-71c257aae0b2@joelhalpern.com> In-Reply-To: <8f25568b-cb57-7714-1e16-71c257aae0b2@joelhalpern.com> From: Tony Przygienda Date: Wed, 6 May 2020 11:31:44 -0700 Message-ID: To: "Joel M. Halpern" Cc: "Les Ginsberg (ginsberg)" , "lsr@ietf.org" Content-Type: multipart/alternative; boundary="000000000000d649e305a4fefe60" Archived-At: Subject: Re: [Lsr] Flooding across a network X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 06 May 2020 18:33:16 -0000 --000000000000d649e305a4fefe60 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable This is not a simple let's-build-a-better-mechanism problem, this is an epistemology problem and uneven information diffusion cannot be fixed by magic when dealing with total distributed computation. Traditional Link-state basically only works because we assume an epsilon consistently (correct term for "eventual" consistency) with very small epsilon across the whole topology. It used that epsilon in seconds was good, now epsilon in hundreds of milliseconds is perceived problematic. If we start to build things where the gradient varies across the network we will have unintended consequences of distributed computation Les describes that cannot be wished away so we better acknowledge them (diffusion is somewhat better unevent gradient scenarios but @ cost of slower convergence under normal condition pi times eye measure ;-). A possible partial remediation to the problem is to prioritize flooding of topology information over reachability (prefixes) but alas, in ISIS that's not how the packets are laid out. back to shelling peanuts ;-) --- tony On Wed, May 6, 2020 at 11:19 AM Joel M. Halpern wrote= : > Les, maybe I am missing your point, but it sounds like what you are > asking for is a (better?) version of the micro-loop prevention work, so > as to mitigate the interaction between inconsistent convergence and > fast-reroute? > > Yours, > Joel > > On 5/6/2020 1:53 PM, Les Ginsberg (ginsberg) wrote: > > Bruno - > > > > I am sorry it has been so difficult for us to understand each other. I > am trying my best. > > > > Look at it this way: > > > > You are the customer. =F0=9F=98=8A > > I am the vendor. > > > > The failure scenario I describe below happens and you notice that all > Northbound destinations loop for 35 seconds whenever fast flooding is > enabled. > > I think you are going to complain about this - to me. =F0=9F=98=8A > > > > And I am going to tell you that this is a consequence of enabling fast > flooding in the presence of a node which does not support it. Your option= s > to reduce the period of looping will be: > > > > 1)Upgrade the slow node to support faster flooding > > 2)Disable fast flooding > > 3)Redesign your network > > > > Les > > > >> -----Original Message----- > >> From: bruno.decraene@orange.com > >> Sent: Wednesday, May 06, 2020 10:10 AM > >> To: Christian Hopps > >> Cc: Les Ginsberg (ginsberg) ; lsr@ietf.org > >> Subject: RE: [Lsr] Flooding across a network > >> > >>> From: Christian Hopps [mailto:chopps@chopps.org] > >>> > >>> Bruno persistence has made me realize something fundamental here. > >>> > >>> The minute the LSP originator changes the LSP and floods it you have > LSDB > >> inconsistency. > >> > >> Exactly my point. Thank you Chris. > >> I would even say: "The minute the LSP originator changes the LSP then > you > >> have LSDB inconsistency." But no big deal if there is disagreement on > this > >> detail. > >> > >>> That is going to last until the last node in the network has updated > it's LSDB. > >> > >> Absolutely. > >> So the faster we flood, the shorter the LSBD inconsistency. > >> > >> Now IMO, even if a single/few nodes flood faster, there is a chance of > >> shortening the LSDB inconsistency. But in all cases, I don't see how > this could > >> make the LSDB inconsistency longer. > >> > >> > >>> Les is pointing out that LSDB inconsistency can be bad in certain > >> circumstances e.g., if a critical node is slow and thus inconsistent. > >>> > >>> I believe the right way to fix this is a simple one, help the operato= r > flag the > >> broken router software/hardware for replacement, but otherwise IS-IS > >> should just try to do the best job it can do to which is to flood > around the > >> problem (i.e., flood as optimally as possible). > >> > >> +1 > >> On a side note, I would not call a router flooding slowly as "broken". > I find it > >> understandable that in a given network there are different type of > routers > >> (core vs aggregation), different roles (P having 50 IGP adjacencies > with 50 PEs > >> vs PE having only 2 IGP adjacencies with 2 P), different hardware > >> generations, different software, different vendors with different > >> perspectives/markets. > >> > >> Thank you Chris. > >> > >> --Bruno > >>> > >>> Thanks, > >>> Chris. > >>> [as WG member] > >>> > >>> > >>>> On May 6, 2020, at 10:33 AM, bruno.decraene@orange.com wrote: > >>>> > >>>> Les, > >>>> > >>>> From: Les Ginsberg (ginsberg) [mailto:ginsberg@cisco.com] > >>>> Sent: Wednesday, May 6, 2020 4:14 PM > >>>> To: DECRAENE Bruno TGI/OLN > >>>> Cc: lsr@ietf.org > >>>> Subject: RE: Flooding across a network > >>>> > >>>> Bruno =E2=80=93 > >>>> > >>>> I am somewhat at a loss to understand your comments. > >>>> The example is straightforward and does not need to consider FIB > update > >> time nor the ordering of prefix updates on different nodes. > >>>> [Bruno] The example is straightforward but you are referring to FIB > and IP > >> packets forwarding as per those FIBs. > >>>> I=E2=80=99d like we focus on LSP flooding and LSDB consistency. > >>>> > >>>> Consider the state of Node B and Node D at various time points from > the > >> trigger event. > >>>> > >>>> T+ 2 seconds: > >>>> ----------------- > >>>> B has received all LSP Updates. It triggers an SPF and for all > Northbound > >> destinations previously reachable via C it installs paths via D. > >>>> Let=E2=80=99s assume it take 5 seconds to update the forwarding plan= e. > >>>> > >>>> D has received 40 of the 1000 LSP updates. It triggers an SPF and > finds > >> that all Northbound destinations are reachable via B-C. It makes no > changes > >> to the forwarding plane. > >>>> > >>>> T+7 seconds > >>>> ----------------- > >>>> B has completed FIB updates. Traffic to all Northbound destinations = is > >> being forwarded via D. > >>>> > >>>> D has now received 140 of the 1000 LSP updates. Entries in its > forwarding > >> plane for Northbound destinations still point to B. > >>>> > >>>> We have a loop. > >>>> > >>>> T + 30 seconds > >>>> -------------------- > >>>> D has now received 600 of the 1000 LSP updates. Still no changes to > its > >> forwarding plane. > >>>> Traffic to Northbound destinations is still looping. > >>>> > >>>> T+ 50 seconds > >>>> ------------------- > >>>> D has finally received all 1000 LSP updates.. > >>>> It triggers (another) SPF and calculates paths to Northbound > destinations > >> via E. It begins to update its forwarding plane. > >>>> Let=E2=80=99s assume this will take 5 seconds.. > >>>> > >>>> T + 55 seconds > >>>> -------------------- > >>>> D has completed forwarding plane updates =E2=80=93 no more looping. > >>>> > >>>> That is all I am trying to illustrate. > >>>> > >>>> If you want to start arguing that node protecting LFAs + microloop > >> avoidance could help (NOTE I explicitly took those out of the example > for > >> simplicity) =E2=80=93 it is easy enough to change the example to inclu= de > multiple node > >> failures or a node failure plus some northbound link failures on other > nodes. > >>>> [Bruno] I=E2=80=99m not talking about LFA/FRR. And with regards to m= icroloops > >> avoidance, some algorithms can handle any graph transition so includin= g > >> multiple node failures. > >>>> > >>>> But again, let=E2=80=99s stick to LSP flooding and LSDB consistency.= (you are > the > >> one speaking about microloops in the forwarding plane). > >>>> > >>>> The point here is to look at the impact of long-lived LSDB > inconsistency > >> which results when some nodes support flooding an order of magnitude > >> faster flooding than other nodes =E2=80=93 which is what you asked me = to > clarify. > >>>> [Bruno] No. I asked you to clarify why having a node with faster > flooding > >> could prolongs the period of LSDB inconsistency. > >>>> > >>>> Again, with you own words: =E2=80=9Cwhen only some nodes in the netw= ork > >> support faster flooding the behavior of the whole network may not be > >> "better" when faster flooding is enabled because it prolongs the perio= d > of > >> LSDB inconsistency.=E2=80=9D > >>>> And with less words: =E2=80=9Cwhen only some nodes in the network su= pport > >> faster flooding [=E2=80=A6] it prolongs the period of LSDB inconsiste= ncy.=E2=80=9D > >>>> > >>>> --Bruno > >>>> > >>>> Les > >>>> > >>>> > >>>> > >>>> From: bruno.decraene@orange.com > >>>> Sent: Wednesday, May 06, 2020 6:21 AM > >>>> To: Les Ginsberg (ginsberg) > >>>> Cc: lsr@ietf.org > >>>> Subject: RE: Flooding across a network > >>>> > >>>> Les, > >>>> > >>>> From: Les Ginsberg (ginsberg) [mailto:ginsberg@cisco.com] > >>>> Sent: Wednesday, May 6, 2020 1:35 AM > >>>> To: DECRAENE Bruno TGI/OLN; lsr@ietf..org > >>>> Subject: RE: Flooding across a network > >>>> > >>>> Bruno - > >>>> > >>>> Seems like it was not too long ago that we were discussing this in > person. > >> Ahhh...the good old days... > >>>> [Bruno] Indeed, may be not to the point of concluding. Indeed. > >>>> > >>>> First, let's agree that the interesting case does not involve 1 or > even a > >> small number of LSPs. For those cases flooding speed does not matter. > >>>> The interesting cases involve a large number of LSPs (hundreds or > >> thousands). And in such cases LFA/microloop avoidance techniques are n= ot > >> applicable. > >>>> > >>>> Take the following simple topology: > >>>> > >>>> | | ... | | > >>>> +---+ +---+ > >>>> | C | | E | > >>>> +---+ +---+ > >>>> | | 1000 > >>>> +---+ +---+ > >>>> | B |-------------| D | > >>>> +---+ 1000 +---+ > >>>> | | > >>>> | | > >>>> \ / > >>>> \ / > >>>> \ / > >>>> \ / > >>>> +---+ > >>>> | A | > >>>> +---+ > >>>> > >>>> There is a topology northbound of C and E (not shown) and a topology > >> southbound of A (not shown). > >>>> Cost on all links is 10 except B-D and D-E where cost is high. > >>>> > >>>> C is a node with 1000 neighbors. > >>>> When all links are up, shortest path for all northbound destinations > is via > >> C. > >>>> All nodes in the network support fast flooding except for Node D. > >>>> Let=E2=80=99s say fast flooding is 500 LSPs/second and slow flooding= (Node D) > is 20 > >> LSPs/seconds. > >>>> If Node C fails we have 1000 LSPs to flood. > >>>> All nodes except for D can receive these in 2 seconds (plus internod= e > >> delay time). > >>>> D can receive LSPs in 50 seconds. > >>>> > >>>> [Bruno] Thanks for your example. Agreed so far. > >>>> > >>>> When A and B and all southbound nodes receive/process the LSP > >> updates they will start sending traffic to Northbound destinations via > D. > >>>> But for the better part of 50 seconds, Node D has yet to receive all > LSP > >> updates and still believes that shortest path is via B-C. It will loop > traffic. > >>>> > >>>> [Bruno] May I remind you that we are discussing IS-IS flooding in > order to > >> sync LSDB (LSP database). That is already a big enough subject. It doe= s > not > >> including FIB (updates), nor IP forwarding. > >>>> > >>>> Quoting you =E2=80=9Cwhen only some nodes in the network support fas= ter > >> flooding the behavior of the whole network may not be "better" when > faster > >> flooding is enabled because it prolongs the period of LSDB > inconsistency.=E2=80=9D > >>>> > >>>> Taking your own examples, in both cases (all nodes support fast > flooding; > >> all nodes but D support fast flooding) the period of LSDB inconsistenc= y > is 50 > >> seconds. Hence this example does not illustrate your statement. > >>>> > >>>> Hence I=E2=80=99m restating my questions: > >>>> > >>>>>> when only some nodes in the network support faster flooding the > >> behavior > >>>>> of the whole network may not be "better" when faster flooding is > >> enabled > >>>>> because it prolongs the period of LSDB inconsistency. > >>>>> > >>>>> 1) Do you have data on this? > >>>>> > >>>>> 2) If not, can you provide an example where increasing the flooding > >> rate on > >>>>> one adjacency prolongs the period of LSDB inconsistency across the > >>>>> network? > >>>> > >>>> > >>>> Had all nodes used slow flooding, it still would have taken 50 > seconds to > >> converge, but there would be significantly less looping. There could b= e > a > >> good amount of blackholing, but this is preferable to looping. > >>>> [Bruno] You are using an example where ordering FIB updates across t= he > >> network, e.g. as per [1], allows to reduce _FIB_ inconsistency across > the > >> path/network. And you seem to conclude from this that this translates = to > >> LSDB update ordering. Those are two different things. In this thread, > I=E2=80=99d > >> suggest that we focus on IGP flooding and LSDB sync only. (*) > >>>> [1] https://tools.ietf.org/html/rfc6976 > >>>> (*) We can discuss loop free IGP converge in a different thread if y= ou > >> want. IMO, the use of segment routing/source routing is better than > oFIB. > >> But at some point, it still relies on fast flooding when multiple LSPs > are > >> involved. (and I mean _fast_ not _ordered_) > >>>> > >>>> --Bruno > >>>> > >>>> One can always come up with examples =E2=80=93 based on a specific t= opology > >> and a specific failure - where things might be better/worse/unchanged > in the > >> face of inconsistent flooding speed support. > >>>> But I hope this simple example illustrates the pitfalls. > >>>> > >>>> Les > >>>> > >>>>> -----Original Message----- > >>>>> From: bruno.decraene@orange.com > >>>>> Sent: Tuesday, May 05, 2020 8:28 AM > >>>>> To: Les Ginsberg (ginsberg) ; lsr@ietf.org > >>>>> Subject: Flooding across a network > >>>>> > >>>>> Les, > >>>>> > >>>>>> From: Lsr [mailto:lsr-bounces@ietf.org] On Behalf Of Les Ginsberg > >>>>> (ginsberg) > >>>>>> Sent: Monday, May 4, 2020 4:39 PM > >>>>> [...] > >>>>>> when only some nodes in the network support faster flooding the > >> behavior > >>>>> of the whole network may not be "better" when faster flooding is > >> enabled > >>>>> because it prolongs the period of LSDB inconsistency. > >>>>> > >>>>> 1) Do you have data on this? > >>>>> > >>>>> 2) If not, can you provide an example where increasing the flooding > >> rate on > >>>>> one adjacency prolongs the period of LSDB inconsistency across the > >>>>> network? > >>>>> > >>>>> 3) In the meantime, let's try the theoretical analysis on a simple > >> scenario > >>>>> where a single LSP needs to be flooded across the network. > >>>>> > >>>>> - Let's call Dij the time needed to flood the LSP from node i to th= e > >> adjacent > >>>>> node j. Clearly Dij>0. > >>>>> - Let's call k the node originating this LSP at t0=3D0s > >>>>> > >>>>> >From t0, the LSDB is inconsistent across the network as all nodes > but k > >> are > >>>>> missing the LSP and hence only know about the 'old' topology. > >>>>> > >>>>> Let's call SPT(k) the SPT rooted on k, using Dij as the metric > between > >>>>> adjacent nodes i and j. Let's call SP(k,i) the shortest path from k > to i; and > >>>>> D(k,i) the shortest distance between k and i. > >>>>> > >>>>> It seems that the time needed: > >>>>> - for node j to learn about the LSP, and get in sync with k, is > D(k,j) > >>>>> - for all nodes across the network to learn about the LSP, and get > in sync > >> with > >>>>> k, is Max[for all j] D(k,j) > >>>>> > >>>>> Then how can reducing the flooding delay on one adjacency could > >> prolongs > >>>>> the period of LSDB inconsistency? > >>>>> It seems to me that it can only improve/decrease it. Otherwise, thi= s > >> would > >>>>> mean that decreasing the cost on a link can increase the cost of th= e > >> shortest > >>>>> path. > >>>>> > >>>>> Note: I agree that there are other cases, such as multiple LSPs > >> originated by > >>>>> the same node, and multiple LSPs originated by multiple nodes, but > >> let's start > >>>>> with the simple case. > >>>>> > >>>>> Thanks, > >>>>> --Bruno > >>>>> > >>>>>> -----Original Message----- > >>>>>> From: Lsr [mailto:lsr-bounces@ietf.org] On Behalf Of Les Ginsberg > >>>>> (ginsberg) > >>>>>> Sent: Monday, May 4, 2020 4:39 PM > >>>>>> > >>>>>> Henk - > >>>>>> > >>>>>> Thanx for your thoughtful posts. > >>>>>> I have read your later posts on this thread as well - but decided = to > >> reply to > >>>>> this one. > >>>>>> Top posting for better readability. > >>>>>> > >>>>>> There is broad agreement that faster flooding is desirable. > >>>>>> There are now two proposals as to how to address the issue - neith= er > >> of > >>>>> which is proposing to use TCP (or equivalent). > >>>>>> > >>>>>> I have commented on why IS-IS flooding requirements are > >> significantly > >>>>> different than that for which TCP is used. > >>>>>> I think it is also useful to note that even the simple test case > which > >> Bruno > >>>>> reported on in last week's interim meeting demonstrated that withou= t > >> any > >>>>> changes to the protocol at all IS-IS was able to flood an order of > >> magnitude > >>>>> faster than it commonly does today. > >>>>>> This gives me hope that we are looking at the problem correctly an= d > >> will not > >>>>> need "TCP". > >>>>>> > >>>>>> Introducing a TCP based solution requires: > >>>>>> > >>>>>> a)A major change to the adjacency formation logic > >>>>>> > >>>>>> b)Removal of the independence of the IS-IS protocol from the > >> address > >>>>> families whose reachability advertisements it supports - something > >> which I > >>>>> think is a great strength of the protocol - particularly in > environments > >> where > >>>>> multiple address family support is needed > >>>>>> > >>>>>> I really don't want to do either of the above. > >>>>>> > >>>>>> Your comments regarding PSNP response times are quite correct - > >> and > >>>>> both of the draft proposals discuss this - though I agree more > detail will > >> be > >>>>> required. > >>>>>> It is intuitive that if you want to flood faster you also need to > ACK > >> faster - > >>>>> and probably even retransmit faster when that is needed. > >>>>>> The basic relationship between retransmit interval and PSNP interv= al > >> is > >>>>> expressed in ISO 10589: > >>>>>> > >>>>>> " partialSNPInterval - This is the amount of time between periodic > >>>>> > action for transmission of Partial Sequence Number PDUs. > >>>>> > It shall be less than minimumLSPTransmission-Interval." > >>>>>> > >>>>>> Of course ISO 10589 recommended values (2 seconds and 5 seconds > >>>>> respectively) associated with a much slower flooding rate and > >>>>> implementations I am aware of use values in this order of magnitude= . > >> These > >>>>> numbers need to be reduced if we are to flood faster, but the > >> relationship > >>>>> between the two needs to remain the same. > >>>>>> > >>>>>> It is also true - as you state - that sending ACKs more quickly > will result > >> in > >>>>> additional PDUs which need to be received/processed by IS-IS - and > this > >> has > >>>>> some impact. But I think it is reasonable to expect that an > >> implementation > >>>>> which can support sending and receiving LSPs at a faster rate shoul= d > >> also be > >>>>> able to send/receive PSNPs at a faster rate. But we still need to b= e > >> smarter > >>>>> than sending one PSNP/one LSP in cases where we have a burst. > >>>>>> > >>>>>> LANs are a more difficult problem than P2P - and thus far draft- > >> ginsberg-lsr- > >>>>> isis-flooding-scale has been silent on this - but not because we > aren't > >> aware > >>>>> of this - just have focused on the P2P behavior first. > >>>>>> What the best behavior on a LAN may be is something I am still > >> considering. > >>>>> Slowing flooding down to the speed at which the slowest IS on the L= AN > >> can > >>>>> support may not be the best strategy - as it also slows down the > >> propagation > >>>>> rate for systems downstream from the nodes on the LAN which can > >> handle > >>>>> faster flooding - thereby having an impact on flooding speed > >> throughout the > >>>>> network in a way which may be out of proportion. This is a smaller > >> example > >>>>> of the larger issue that when only some nodes in the network suppor= t > >> faster > >>>>> flooding the behavior of the whole network may not be "better" when > >> faster > >>>>> flooding is enabled because it prolongs the period of LSDB > >> inconsistency. > >>>>> More work needs to be done here... > >>>>>> > >>>>>> In summary, I don't expect to have to "reinvent TCP" - but I do > think > >> you > >>>>> have provided a useful perspective for us to consider as we progres= s > on > >> this > >>>>> topic, > >>>>>> > >>>>>> Thanx. > >>>>>> > >>>>> > Les > >>>>>> > >>>>>> > >>>>>>> -----Original Message----- > >>>>>>> From: Lsr On Behalf Of Henk Smit > >>>>>>> Sent: Thursday, April 30, 2020 6:58 AM > >>>>>>> To: lsr@ietf.org > >>>>>>> Subject: [Lsr] Why only a congestion-avoidance algorithm on the > >> sender > >>>>> isn't > >>>>>>> enough > >>>>>>> > >>>>>>> > >>>>>>> Hello all, > >>>>>>> > >>>>>>> Two years ago, Gunter Van de Velde and myself published this > >> draft: > >>>>>>> > https://tools.ietf.org/html/draft-hsmit-lsr-isis-flooding-over-tcp-00 > >>>>>>> That started this discussion about flow/congestion control and IS= IS > >>>>>>> flooding. > >>>>>>> > >>>>>>> My thoughts were that once we start implementing new algorithms > >> to > >>>>>>> optimize ISIS flooding speed, we'll end up with our own version o= f > >> TCP. > >>>>>>> I think most people here have a good general understanding of TCP= . > >>>>>>> But if not, this is a good overview how TCP does it: > >>>>>>> https://en.wikipedia.org/wiki/TCP_congestion_control > >>>>>>> > >>>>>>> > >>>>>>> What does TCP do: > >>>>>>> =3D=3D=3D=3D > >>>>>>> TCP does 2 things: flow control and congestion control. > >>>>>>> > >>>>>>> 1) Flow control is: the receiver trying to prevent itself from > being > >>>>>>> overloaded. The receiver indicates, through the receiver-window- > >> size > >>>>>>> in the TCP acks, how much data it can or wants to receive. > >>>>>>> 2) Congestion control is: the sender trying to prevent the links > >> between > >>>>>>> sender and receiver from being overloaded. The sender makes an > >>>>> educated > >>>>>>> guess at what speed it can send. > >>>>>>> > >>>>>>> > >>>>>>> The part we seem to be missing: > >>>>>>> =3D=3D=3D=3D > >>>>>>> For the sender to make a guess at what speed it can send, it look= s > at > >>>>>>> how the transmission is behaving. Are there drops ? What is the R= TT > >> ? > >>>>>>> Do drop-percentage and RTT change ? Do acks come in at the same > >> rate > >>>>>>> as the sender sends segments ? Are there duplicate acks ? To be > >> able > >>>>>>> to do this, the sender must know what to expect. How acks behave. > >>>>>>> > >>>>>>> If you want an ISIS sender to make a guess at what speed it can > >> send, > >>>>>>> without changing the protocol, the only thing the sender can do i= s > >> look > >>>>>>> at the PSNPs that come back from the receiver. But the RTT of > >> PSNPs can > >>>>>>> not be predicted. Because a good ISIS implementation does not > >>>>>>> immediately > >>>>>>> send a PSNP when it receives a LSP. 1) the receiver should jitter > the > >>>>>>> PSNP, > >>>>>>> like it should jitter all packets. And 2) the receiver should wai= t > a > >>>>>>> little > >>>>>>> to see if it can combine multiple acks into a single PSNP packet. > >>>>>>> > >>>>>>> In TCP, if a single segment gets lost, each new segment will caus= e > >> the > >>>>>>> receiver to send an ack with the seqnr of the last received byte. > This > >>>>>>> is called "duplicate acks". This triggers the sender to do > >>>>>>> fast-retransmission. In ISIS, this can't be be done. The > information > >>>>>>> a sender can get from looking at incoming PSNPs is a lot less tha= n > >> what > >>>>>>> TCP can learn from incoming acks. > >>>>>>> > >>>>>>> > >>>>>>> The problem with sender-side congestion control: > >>>>>>> =3D=3D=3D=3D > >>>>>>> In ISIS, all we know is that the default retransmit-interval is 5 > >>>>>>> seconds. > >>>>>>> And I think most implementations use that as the default. This > >> means > >>>>>>> that > >>>>>>> the receiver of an LSP has one requirement: send a PSNP within 5 > >>>>>>> seconds. > >>>>>>> For the rest, implementations are free to send PSNPs however and > >>>>>>> whenever > >>>>>>> they want. This means a sender can not really make conclusions > >> about > >>>>>>> flooding speed, dropped LSPs, capacity of the receiver, etc. > >>>>>>> There is no ordering when flooding LSPs, or sending PSNPs. This > >> makes > >>>>>>> a sender-side algorithm for ISIS a lot harder. > >>>>>>> > >>>>>>> When you think about it, you realize that a sender should wait th= e > >>>>>>> full 5 seconds before it can make any real conclusions about > >> dropped > >>>>>>> LSPs. > >>>>>>> If a sender looks at PSNPs to determine its flooding speed, it wi= ll > >>>>>>> probably > >>>>>>> not be able to react without a delay of a few seconds. A sender > >> might > >>>>>>> send > >>>>>>> hunderds or thousands of LSPs in those 5 seconds, which might all > >> or > >>>>>>> partially be dropped, complicating matters even further. > >>>>>>> > >>>>>>> > >>>>>>> A sender-sider algorithm should specify how to do PSNPs. > >>>>>>> =3D=3D=3D=3D > >>>>>>> So imho a sender-side only algorithm can't work just like that in= a > >>>>>>> multi-vendor environment. We must not only specify a congestion- > >>>>> control > >>>>>>> algorithm for the sender. We must also specify for the receiver a > >> more > >>>>>>> specific algorithm how and when to send PSNPs. At least how to do > >>>>> PSNPs > >>>>>>> under load. > >>>>>>> > >>>>>>> Note that this might result in the receiver sending more (and > >> smaller) > >>>>>>> PSNPs. > >>>>>>> More packets might mean more congestion (inside routers). > >>>>>>> > >>>>>>> > >>>>>>> Will receiver-side flow-control work ? > >>>>>>> =3D=3D=3D=3D > >>>>>>> I don't know if that's enough. It will certainly help. > >>>>>>> > >>>>>>> I think to tackle this problem, we need 3 parts: > >>>>>>> 1) sender-side congestion-control algorithm > >>>>>>> 2) more detailed algorithm on receiver when and how to send > >> PSNPs > >>>>>>> 3) receiver-side flow-control mechanism > >>>>>>> > >>>>>>> As discussed at length, I don't know if the ISIS process on the > >>>>>>> receiving > >>>>>>> router can actually know if its running out of resources (buffers > on > >>>>>>> interfaces, linecards, etc). That's implementation dependent. A > >> receiver > >>>>>>> can definitely advertise a fixed value. So the sender has an uppe= r > >> bound > >>>>>>> to use when doing congestion-control. Just like TCP has both a > >>>>>>> flow-control > >>>>>>> window and a congestion-control window, and a sender uses both. > >>>>> Maybe > >>>>>>> the > >>>>>>> receiver can even advertise a dynamic value. Maybe now, maybe > >> only in > >>>>>>> the > >>>>>>> future. An advertised upper limit seems useful to me today. > >>>>>>> > >>>>>>> > >>>>>>> What I didn't like about our own proposal (flooding over TCP): > >>>>>>> =3D=3D=3D=3D > >>>>>>> The problem I saw with flooding over TCP concerns multi-point > >> networks > >>>>>>> (LANs). > >>>>>>> > >>>>>>> When flooding over a multi-point network, setting up TCP > >> connections > >>>>>>> introduces serious challenges. Who are the endpoints of the TCP > >>>>>>> connections ? > >>>>>>> Full mesh ? Or do all ISes on a LAN create a TCP-connection to th= e > >> DIS ? > >>>>>>> There is no backup DIS in ISIS (unlike OSPF). Things get messy > >> quickly. > >>>>>>> > >>>>>>> However, the other two proposals do not solve this problem either= . > >>>>>>> How will a sender-side congestion-avoidence algorithm determine > >>>>> whether > >>>>>>> there were drops ? There are no acks (PSNPs) on a LAN. We assume > >> most > >>>>>>> LSPs > >>>>>>> that are broadcasted are received by all other ISes on the LAN. > >> There > >>>>>>> are > >>>>>>> no acks. Only after the DIS has sent its periodic CSNPs, ISes can > send > >>>>>>> PSNPs to request retransmissions. It seems impossible (or very > >> hard) to > >>>>>>> me for all ISes on a LAN to keep track of dropped LSPs and adjust > >> their > >>>>>>> sending speed accordingly.. > >>>>>>> > >>>>>>> When flooding on a LAN, the receiver-side algorithm seems best. > >>>>> Because > >>>>>>> all ISes can see what the lowest advertised sending-speed is. And > >> make > >>>>>>> sure they send slow enough to not overload the slowest IS. I'm no= t > >> sure > >>>>>>> this is a good solution, but is seems easier and more realistic > than > >>>>>>> ISIS-flooding-over-TCP or sender-side congestion-avoidance. > >>>>>>> > >>>>>>> > >>>>>>> My conclusion: > >>>>>>> =3D=3D=3D=3D > >>>>>>> Sender-side congestion-control won't work without specifying in > >> more > >>>>>>> detail how and when to send PSNPs. > >>>>>>> Receiver-side flow-control will certainly help. I dont' know if > it's > >>>>>>> good enough. I don't know if advertising a static value is good > >> enough. > >>>>>>> But it's a start. > >>>>>>> > >>>>>>> I still think we'll end up re-implementing a new (and weaker) TCP= . > >>>>>>> > >>>>>>> > >>>>>>> henk. > >>>>>>> > >>>>>>> _______________________________________________ > >>>>>>> Lsr mailing list > >>>>>>> Lsr@ietf.org > >>>>>>> https://www.ietf.org/mailman/listinfo/lsr > >>>>>> > >>>>>> _______________________________________________ > >>>>>> Lsr mailing list > >>>>>> Lsr@ietf.org > >>>>>> https://www.ietf.org/mailman/listinfo/lsr > >>>>> > >>>>> > >> __________________________________________________________ > >>>>> > >> __________________________________________________________ > >>>>> _____ > >>>>> > >>>>> Ce message et ses pieces jointes peuvent contenir des informations > >>>>> confidentielles ou privilegiees et ne doivent donc > >>>>> pas etre diffuses, exploites ou copies sans autorisation. Si vous > avez > >> recu ce > >>>>> message par erreur, veuillez le signaler > >>>>> a l'expediteur et le detruire ainsi que les pieces jointes. Les > messages > >>>>> electroniques etant susceptibles d'alteration, > >>>>> Orange decline toute responsabilite si ce message a ete altere, > >> deforme ou > >>>>> falsifie. Merci. > >>>>> > >>>>> This message and its attachments may contain confidential or > privileged > >>>>> information that may be protected by law; > >>>>> they should not be distributed, used or copied without authorisatio= n. > >>>>> If you have received this email in error, please notify the sender > and > >> delete > >>>>> this message and its attachments. > >>>>> As emails may be altered, Orange is not liable for messages that ha= ve > >> been > >>>>> modified, changed or falsified. > >>>>> Thank you. > >>>> > >>>> > >> __________________________________________________________ > >> __________________________________________________________ > >> _____ > >>>> > >>>> Ce message et ses pieces jointes peuvent contenir des informations > >> confidentielles ou privilegiees et ne doivent donc > >>>> pas etre diffuses, exploites ou copies sans autorisation. Si vous > avez recu > >> ce message par erreur, veuillez le signaler > >>>> a l'expediteur et le detruire ainsi que les pieces jointes. Les > messages > >> electroniques etant susceptibles d'alteration, > >>>> Orange decline toute responsabilite si ce message a ete altere, > deforme > >> ou falsifie. Merci. > >>>> > >>>> This message and its attachments may contain confidential or > privileged > >> information that may be protected by law; > >>>> they should not be distributed, used or copied without authorisation= . > >>>> If you have received this email in error, please notify the sender a= nd > >> delete this message and its attachments. > >>>> As emails may be altered, Orange is not liable for messages that hav= e > >> been modified, changed or falsified. > >>>> Thank you. > >>>> > >> __________________________________________________________ > >> __________________________________________________________ > >> _____ > >>>> > >>>> Ce message et ses pieces jointes peuvent contenir des informations > >> confidentielles ou privilegiees et ne doivent donc > >>>> pas etre diffuses, exploites ou copies sans autorisation. Si vous > avez recu > >> ce message par erreur, veuillez le signaler > >>>> a l'expediteur et le detruire ainsi que les pieces jointes. Les > messages > >> electroniques etant susceptibles d'alteration, > >>>> Orange decline toute responsabilite si ce message a ete altere, > deforme > >> ou falsifie. Merci. > >>>> > >>>> This message and its attachments may contain confidential or > privileged > >> information that may be protected by law; > >>>> they should not be distributed, used or copied without authorisation= . > >>>> If you have received this email in error, please notify the sender a= nd > >> delete this message and its attachments. > >>>> As emails may be altered, Orange is not liable for messages that hav= e > >> been modified, changed or falsified. > >>>> Thank you. > >>>> > >>>> _______________________________________________ > >>>> Lsr mailing list > >>>> Lsr@ietf.org > >>>> https://www.ietf.org/mailman/listinfo/lsr > >>> > >> > >> __________________________________________________________ > >> __________________________________________________________ > >> _____ > >> > >> Ce message et ses pieces jointes peuvent contenir des informations > >> confidentielles ou privilegiees et ne doivent donc > >> pas etre diffuses, exploites ou copies sans autorisation. Si vous avez > recu ce > >> message par erreur, veuillez le signaler > >> a l'expediteur et le detruire ainsi que les pieces jointes. Les messag= es > >> electroniques etant susceptibles d'alteration, > >> Orange decline toute responsabilite si ce message a ete altere, deform= e > ou > >> falsifie. Merci. > >> > >> This message and its attachments may contain confidential or privilege= d > >> information that may be protected by law; > >> they should not be distributed, used or copied without authorisation. > >> If you have received this email in error, please notify the sender and > delete > >> this message and its attachments. > >> As emails may be altered, Orange is not liable for messages that have > been > >> modified, changed or falsified. > >> Thank you. > > > > _______________________________________________ > > Lsr mailing list > > Lsr@ietf.org > > https://www.ietf.org/mailman/listinfo/lsr > > > > _______________________________________________ > Lsr mailing list > Lsr@ietf.org > https://www.ietf.org/mailman/listinfo/lsr > --000000000000d649e305a4fefe60 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
This is not a simple let's-build-a-better-mechani= sm problem, this is an epistemology problem and uneven information diffusio= n cannot be fixed by magic when dealing with total distributed computation.= Traditional Link-state basically only works because we assume an epsilon c= onsistently (correct term for "eventual" consistency) with very s= mall epsilon across the whole topology. It used that epsilon in seconds was= good, now epsilon in hundreds of milliseconds is perceived problematic. If= we start to build things where the gradient varies across the network we w= ill have unintended consequences of distributed computation Les describes t= hat cannot be wished away so we better acknowledge them (diffusion is somew= hat better unevent gradient scenarios but @ cost of slower convergence unde= r normal condition pi times eye measure ;-).

= A possible partial remediation to the problem is to prioritize flooding of = topology information over reachability (prefixes) but alas, in ISIS that= 9;s not how the packets are laid out.

back to = shelling peanuts ;-)

--- tony

On We= d, May 6, 2020 at 11:19 AM Joel M. Halpern <jmh@joelhalpern.com> wrote:
Les, maybe I am missing your point, but it so= unds like what you are
asking for is a (better?) version of the micro-loop prevention work, so as to mitigate the interaction between inconsistent convergence and
fast-reroute?

Yours,
Joel

On 5/6/2020 1:53 PM, Les Ginsberg (ginsberg) wrote:
> Bruno -
>
> I am sorry it has been so difficult for us to understand each other. I= am trying my best.
>
> Look at it this way:
>
> You are the customer. =F0=9F=98=8A
> I am the vendor.
>
> The failure scenario I describe below happens and you notice that all = Northbound destinations loop for 35 seconds whenever fast flooding is enabl= ed.
> I think you are going to complain about this - to me. =F0=9F=98=8A
>
> And I am going to tell you that this is a consequence of enabling fast= flooding in the presence of a node which does not support it. Your options= to reduce the period of looping will be:
>
> 1)Upgrade the slow node to support faster flooding
> 2)Disable fast flooding
> 3)Redesign your network
>
>=C2=A0 =C2=A0 =C2=A0 Les
>
>> -----Original Message-----
>> From: bruno.decraene@orange.com <bruno.decraene@orange.com>
>> Sent: Wednesday, May 06, 2020 10:10 AM
>> To: Christian Hopps <chopps@chopps.org>
>> Cc: Les Ginsberg (ginsberg) <ginsberg@cisco.com>; lsr@ietf.org
>> Subject: RE: [Lsr] Flooding across a network
>>
>>> From: Christian Hopps [mailto:chopps@chopps.org]
>>>
>>> Bruno persistence has made me realize something fundamental he= re.
>>>
>>> The minute the LSP originator changes the LSP and floods it yo= u have LSDB
>> inconsistency.
>>
>> Exactly my point. Thank you Chris.
>> I would even say: "The minute the LSP originator changes the = LSP then you
>> have LSDB inconsistency." But no big deal if there is disagre= ement on this
>> detail.
>>
>>> That is going to last until the last node in the network has u= pdated it's LSDB.
>>
>> Absolutely.
>> So the faster we flood, the shorter the LSBD inconsistency.
>>
>> Now IMO, even if a single/few nodes flood faster, there is a chanc= e of
>> shortening the LSDB inconsistency. But in all cases, I don't s= ee how this could
>> make the LSDB inconsistency longer.
>>
>>
>>> Les is pointing out that LSDB inconsistency can be bad in cert= ain
>> circumstances e.g., if a critical node is slow and thus inconsiste= nt.
>>>
>>> I believe the right way to fix this is a simple one, help the = operator flag the
>> broken router software/hardware for replacement, but otherwise IS-= IS
>> should just try to do the best job it can do to which is to flood = around the
>> problem (i.e., flood as optimally as possible).
>>
>> +1
>> On a side note, I would not call a router flooding slowly as "= ;broken". I find it
>> understandable that in a given network there are different type of= routers
>> (core vs aggregation), different roles (P having 50 IGP adjacencie= s with 50 PEs
>> vs PE having only 2 IGP adjacencies with 2 P), different hardware<= br> >> generations, different software, different vendors with different<= br> >> perspectives/markets.
>>
>> Thank you Chris.
>>
>> --Bruno
>>>
>>> Thanks,
>>> Chris.
>>> [as WG member]
>>>
>>>
>>>> On May 6, 2020, at 10:33 AM, bruno.decraene@orange.com wrote:
>>>>
>>>> Les,
>>>>
>>>> From: Les Ginsberg (ginsberg) [mailto:ginsberg@cisco.com]
>>>> Sent: Wednesday, May 6, 2020 4:14 PM
>>>> To: DECRAENE Bruno TGI/OLN
>>>> Cc: lsr@= ietf.org
>>>> Subject: RE: Flooding across a network
>>>>
>>>> Bruno =E2=80=93
>>>>
>>>> I am somewhat at a loss to understand your comments.
>>>> The example is straightforward and does not need to consid= er FIB update
>> time nor the ordering of prefix updates on different nodes.
>>>> [Bruno] The example is straightforward but you are referri= ng to FIB and IP
>> packets forwarding as per those FIBs.
>>>> I=E2=80=99d like we focus on LSP flooding and LSDB consist= ency.
>>>>
>>>> Consider the state of Node B and Node D at various time po= ints from the
>> trigger event.
>>>>
>>>> T+ 2 seconds:
>>>> -----------------
>>>> B has received all LSP Updates. It triggers an SPF and for= all Northbound
>> destinations previously reachable via C it installs paths via D. >>>> Let=E2=80=99s assume it take 5 seconds to update the forwa= rding plane.
>>>>
>>>> D has received 40 of the 1000 LSP updates. It triggers an = SPF and finds
>> that all Northbound destinations are reachable via B-C. It makes n= o changes
>> to the forwarding plane.
>>>>
>>>> T+7 seconds
>>>> -----------------
>>>> B has completed FIB updates. Traffic to all Northbound des= tinations is
>> being forwarded via D.
>>>>
>>>> D has now received 140 of the 1000 LSP updates. Entries in= its forwarding
>> plane for Northbound destinations still point to B.
>>>>
>>>> We have a loop.
>>>>
>>>> T + 30 seconds
>>>> --------------------
>>>> D has now received 600 of the 1000 LSP updates. Still no c= hanges to its
>> forwarding plane.
>>>> Traffic to Northbound destinations is still looping.
>>>>
>>>> T+ 50 seconds
>>>> -------------------
>>>> D has finally received all 1000 LSP updates..
>>>> It triggers (another) SPF and calculates paths to Northbou= nd destinations
>> via E. It begins to update its forwarding plane.
>>>> Let=E2=80=99s assume this will take 5 seconds..
>>>>
>>>> T + 55 seconds
>>>> --------------------
>>>> D has completed forwarding plane updates =E2=80=93 no more= looping.
>>>>
>>>> That is all I am trying to illustrate.
>>>>
>>>> If you want to start arguing that node protecting LFAs + m= icroloop
>> avoidance could help (NOTE I explicitly=C2=A0 took those out of th= e example for
>> simplicity) =E2=80=93 it is easy enough to change the example to i= nclude multiple node
>> failures or a node failure plus some northbound link failures on o= ther nodes.
>>>> [Bruno] I=E2=80=99m not talking about LFA/FRR. And with re= gards to microloops
>> avoidance, some algorithms can handle any graph transition so incl= uding
>> multiple node failures.
>>>>
>>>> But again, let=E2=80=99s stick to LSP flooding and LSDB co= nsistency. (you are the
>> one speaking about microloops in the forwarding plane).
>>>>
>>>> The point here is to look at the impact of long-lived LSDB= inconsistency
>> which results when some nodes support flooding an order of magnitu= de
>> faster flooding than other nodes =E2=80=93 which is what you asked= me to clarify.
>>>> [Bruno] No. I asked you to clarify why having a node with = faster flooding
>> could prolongs the period of LSDB inconsistency.
>>>>
>>>> Again, with you own words: =E2=80=9Cwhen only some nodes i= n the network
>> support faster flooding the behavior of the whole network may not = be
>> "better" when faster flooding is enabled because it prol= ongs the period of
>> LSDB inconsistency.=E2=80=9D
>>>> And with less words: =E2=80=9Cwhen only some nodes in the = network support
>> faster flooding [=E2=80=A6]=C2=A0 it prolongs the period of LSDB i= nconsistency.=E2=80=9D
>>>>
>>>> --Bruno
>>>>
>>>>=C2=A0 =C2=A0 =C2=A0Les
>>>>
>>>>
>>>>
>>>> From: bruno.decraene@orange.com <bruno.decraene@orange.com>
>>>> Sent: Wednesday, May 06, 2020 6:21 AM
>>>> To: Les Ginsberg (ginsberg) <ginsberg@cisco.com>
>>>> Cc: lsr@= ietf.org
>>>> Subject: RE: Flooding across a network
>>>>
>>>> Les,
>>>>
>>>> From: Les Ginsberg (ginsberg) [mailto:ginsberg@cisco.com]
>>>> Sent: Wednesday, May 6, 2020 1:35 AM
>>>> To: DECRAENE Bruno TGI/OLN; lsr@ietf..org
>>>> Subject: RE: Flooding across a network
>>>>
>>>> Bruno -
>>>>
>>>> Seems like it was not too long ago that we were discussing= this in person.
>> Ahhh...the good old days...
>>>> [Bruno] Indeed, may be not to the point of concluding. Ind= eed.
>>>>
>>>> First, let's agree that the interesting case does not = involve 1 or even a
>> small number of LSPs. For those cases flooding speed does not matt= er.
>>>> The interesting cases involve a large number of LSPs (hund= reds or
>> thousands). And in such cases LFA/microloop avoidance techniques a= re not
>> applicable.
>>>>
>>>> Take the following simple topology:
>>>>
>>>>=C2=A0 =C2=A0 =C2=A0|=C2=A0 | ... |=C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 |
>>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0+---+=C2=A0 =C2=A0 =C2=A0 =C2=A0= =C2=A0 =C2=A0 =C2=A0+---+
>>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0| C |=C2=A0 =C2=A0 =C2=A0 =C2=A0= =C2=A0 =C2=A0 =C2=A0| E |
>>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0+---+=C2=A0 =C2=A0 =C2=A0 =C2=A0= =C2=A0 =C2=A0 =C2=A0+---+
>>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0| 1000
>>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0+---+=C2=A0 =C2=A0 =C2=A0 =C2=A0= =C2=A0 =C2=A0 =C2=A0+---+
>>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0| B |-------------| D |
>>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0+---+=C2=A0 =C2=A01000=C2=A0 =C2= =A0 =C2=A0 +---+
>>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|
>>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|=C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0|
>>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 \=C2=A0 =C2=A0 =C2=A0 = =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0/
>>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0\=C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 /
>>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 \=C2=A0 =C2=A0 = =C2=A0 =C2=A0 =C2=A0/
>>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0\=C2=A0 =C2= =A0 =C2=A0 /
>>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0+---= +
>>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0| A = |
>>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0+---= +
>>>>
>>>> There is a topology northbound of C and E (not shown) and = a topology
>> southbound of A (not shown).
>>>> Cost on all links is 10 except B-D and D-E where cost is h= igh.
>>>>
>>>> C is a node with 1000 neighbors.
>>>> When all links are up, shortest path for all northbound de= stinations is via
>> C.
>>>> All nodes in the network support fast flooding except for = Node D.
>>>> Let=E2=80=99s say fast flooding is 500 LSPs/second and slo= w flooding (Node D) is 20
>> LSPs/seconds.
>>>> If=C2=A0 Node C fails we have 1000 LSPs to flood.
>>>> All nodes except for D can receive these in 2 seconds (plu= s internode
>> delay time).
>>>> D can receive LSPs in 50 seconds.
>>>>
>>>> [Bruno] Thanks for your example. Agreed so far.
>>>>
>>>> When A and B and all southbound nodes receive/process the = LSP
>> updates they will start sending traffic to Northbound destinations= via D.
>>>> But for the better part of 50 seconds, Node D has yet to r= eceive all LSP
>> updates and still believes that shortest path is via B-C. It will = loop traffic.
>>>>
>>>> [Bruno] May I remind you that we are discussing IS-IS floo= ding in order to
>> sync LSDB (LSP database). That is already a big enough subject. It= does not
>> including FIB (updates), nor IP forwarding.
>>>>
>>>> Quoting you =E2=80=9Cwhen only some nodes in the network s= upport faster
>> flooding the behavior of the whole network may not be "better= " when faster
>> flooding is enabled because it prolongs the period of LSDB inconsi= stency.=E2=80=9D
>>>>
>>>> Taking your own examples, in both cases (all nodes support= fast flooding;
>> all nodes but D support fast flooding) the period of LSDB inconsis= tency is 50
>> seconds. Hence this example does not illustrate your statement. >>>>
>>>> Hence I=E2=80=99m restating my questions:
>>>>
>>>>>> when only some nodes in the network support faster= flooding the
>> behavior
>>>>> of the whole network may not be "better" whe= n faster flooding is
>> enabled
>>>>> because it prolongs the period of LSDB inconsistency.<= br> >>>>>
>>>>> 1) Do you have data on this?
>>>>>
>>>>> 2) If not, can you provide an example where increasing= the flooding
>> rate on
>>>>> one adjacency prolongs the period of LSDB inconsistenc= y across the
>>>>> network?
>>>>
>>>>
>>>> Had all nodes used slow flooding, it still would have take= n 50 seconds to
>> converge, but there would be significantly less looping. There cou= ld be a
>> good amount of blackholing, but this is preferable to looping.
>>>> [Bruno] You are using an example where ordering FIB update= s across the
>> network, e.g. as per [1], allows to reduce _FIB_ inconsistency acr= oss the
>> path/network. And you seem to conclude from this that this transla= tes to
>> LSDB update ordering. Those are two different things. In this thre= ad, I=E2=80=99d
>> suggest that we focus on IGP flooding and LSDB sync only. (*)
>>>> [1] https://tools.ietf.org/html/rfc6976
>>>> (*) We can discuss loop free IGP converge in a different t= hread if you
>> want. IMO, the use of segment routing/source routing is better tha= n oFIB.
>> But at some point, it still relies on fast flooding when multiple = LSPs are
>> involved. (and I mean _fast_ not _ordered_)
>>>>
>>>> --Bruno
>>>>
>>>> One can always come up with examples =E2=80=93 based on a = specific topology
>> and a specific failure - where things might be better/worse/unchan= ged in the
>> face of inconsistent flooding speed support.
>>>> But I hope this simple example illustrates the pitfalls. >>>>
>>>>=C2=A0 =C2=A0 =C2=A0 Les
>>>>
>>>>> -----Original Message-----
>>>>> From: bruno.decraene@orange.com <bruno.decraene@orange.com>
>>>>> Sent: Tuesday, May 05, 2020 8:28 AM
>>>>> To: Les Ginsberg (ginsberg) <ginsberg@cisco.com>; lsr@ietf.org
>>>>> Subject: Flooding across a network
>>>>>
>>>>> Les,
>>>>>
>>>>>> From: Lsr [mailto:lsr-bounces@ietf.org] On Behalf Of Les Ginsbe= rg
>>>>> (ginsberg)
>>>>>> Sent: Monday, May 4, 2020 4:39 PM
>>>>> [...]
>>>>>> when only some nodes in the network support faster= flooding the
>> behavior
>>>>> of the whole network may not be "better" whe= n faster flooding is
>> enabled
>>>>> because it prolongs the period of LSDB inconsistency.<= br> >>>>>
>>>>> 1) Do you have data on this?
>>>>>
>>>>> 2) If not, can you provide an example where increasing= the flooding
>> rate on
>>>>> one adjacency prolongs the period of LSDB inconsistenc= y across the
>>>>> network?
>>>>>
>>>>> 3) In the meantime, let's try the theoretical anal= ysis on a simple
>> scenario
>>>>> where a single LSP needs to be flooded across the netw= ork.
>>>>>
>>>>> - Let's call Dij the time needed to flood the LSP = from node i to the
>> adjacent
>>>>> node j. Clearly Dij>0.
>>>>> - Let's call k the node originating this LSP at t0= =3D0s
>>>>>
>>>>> >From t0, the LSDB is inconsistent across the netwo= rk as all nodes but k
>> are
>>>>> missing the LSP and hence only know about the 'old= ' topology.
>>>>>
>>>>> Let's call=C2=A0 SPT(k) the SPT rooted on k, using= Dij as the metric between
>>>>> adjacent nodes i and j. Let's call SP(k,i) the sho= rtest path from k to i; and
>>>>> D(k,i) the shortest distance between k and i.
>>>>>
>>>>> It seems that the time needed:
>>>>> - for node j to learn about the LSP, and get in sync w= ith k, is D(k,j)
>>>>> - for all nodes across the network to learn about the = LSP, and get in sync
>> with
>>>>> k, is Max[for all j] D(k,j)
>>>>>
>>>>> Then how can reducing the flooding delay on one adjace= ncy could
>> prolongs
>>>>> the period of LSDB inconsistency?
>>>>> It seems to me that it can only improve/decrease it. O= therwise, this
>> would
>>>>> mean that decreasing the cost on a link can increase t= he cost of the
>> shortest
>>>>> path.
>>>>>
>>>>> Note: I agree that there are other cases, such as=C2= =A0 multiple LSPs
>> originated by
>>>>> the same node, and multiple LSPs originated by multipl= e nodes, but
>> let's start
>>>>> with the simple case.
>>>>>
>>>>> Thanks,
>>>>> --Bruno
>>>>>
>>>>>> -----Original Message-----
>>>>>> From: Lsr [mailto:lsr-bounces@ietf.org] On Behalf Of Les Ginsbe= rg
>>>>> (ginsberg)
>>>>>> Sent: Monday, May 4, 2020 4:39 PM
>>>>>>
>>>>>> Henk -
>>>>>>
>>>>>> Thanx for your thoughtful posts.
>>>>>> I have read your later posts on this thread as wel= l - but decided to
>> reply to
>>>>> this one.
>>>>>> Top posting for better readability.
>>>>>>
>>>>>> There is broad agreement that faster flooding is d= esirable.
>>>>>> There are now two proposals as to how to address t= he issue - neither
>> of
>>>>> which is proposing to use TCP (or equivalent).
>>>>>>
>>>>>> I have commented on why IS-IS flooding requirement= s are
>> significantly
>>>>> different than that for which TCP is used.
>>>>>> I think it is also useful to note that even the si= mple test case which
>> Bruno
>>>>> reported on in last week's interim meeting demonst= rated that without
>> any
>>>>> changes to the protocol at all IS-IS was able to flood= an order of
>> magnitude
>>>>> faster than it commonly does today.
>>>>>> This gives me hope that we are looking at the prob= lem correctly and
>> will not
>>>>> need "TCP".
>>>>>>
>>>>>> Introducing a TCP based solution requires:
>>>>>>
>>>>>> a)A major change to the adjacency formation logic<= br> >>>>>>
>>>>>> b)Removal of the independence of the IS-IS protoco= l from the
>> address
>>>>> families whose reachability advertisements it supports= - something
>> which I
>>>>> think is a great strength of the protocol - particular= ly in environments
>> where
>>>>> multiple address family support is needed
>>>>>>
>>>>>> I really don't want to do either of the above.=
>>>>>>
>>>>>> Your comments regarding PSNP response times are qu= ite correct -
>> and
>>>>> both of the draft proposals discuss this - though I ag= ree more detail will
>> be
>>>>> required.
>>>>>> It is intuitive that if you want to flood faster y= ou also need to ACK
>> faster -
>>>>> and probably even retransmit faster when that is neede= d.
>>>>>> The basic relationship between retransmit interval= and PSNP interval
>> is
>>>>> expressed in ISO 10589:
>>>>>>
>>>>>> " partialSNPInterval - This is the amount of = time between periodic
>>>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 > action for tran= smission of Partial Sequence Number PDUs.
>>>>>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 > It shall be les= s than minimumLSPTransmission-Interval."
>>>>>>
>>>>>> Of course ISO 10589 recommended values (2 seconds = and 5 seconds
>>>>> respectively) associated with a much slower flooding r= ate and
>>>>> implementations I am aware of use values in this order= of magnitude.
>> These
>>>>> numbers need to be reduced if we are to flood faster, = but the
>> relationship
>>>>> between the two needs to remain the same.
>>>>>>
>>>>>> It is also true - as you state - that sending ACKs= more quickly will result
>> in
>>>>> additional PDUs which need to be received/processed by= IS-IS - and this
>> has
>>>>> some impact. But I think it is reasonable to expect th= at an
>> implementation
>>>>> which can support sending and receiving LSPs at a fast= er rate should
>> also be
>>>>> able to send/receive PSNPs at a faster rate. But we st= ill need to be
>> smarter
>>>>> than sending one PSNP/one LSP in cases where we have a= burst.
>>>>>>
>>>>>> LANs are a more difficult problem than P2P - and t= hus far draft-
>> ginsberg-lsr-
>>>>> isis-flooding-scale has been silent on this - but not = because we aren't
>> aware
>>>>> of this - just have focused on the P2P behavior first.=
>>>>>> What the best behavior on a LAN may be is somethin= g I am still
>> considering.
>>>>> Slowing flooding down to the speed at which the slowes= t IS on the LAN
>> can
>>>>> support may not be the best strategy - as it also slow= s down the
>> propagation
>>>>> rate for systems downstream from the nodes on the LAN = which can
>> handle
>>>>> faster flooding - thereby having an impact on flooding= speed
>> throughout the
>>>>> network in a way which may be out of proportion. This = is a smaller
>> example
>>>>> of the larger issue that when only some nodes in the n= etwork support
>> faster
>>>>> flooding the behavior of the whole network may not be = "better" when
>> faster
>>>>> flooding is enabled because it prolongs the period of = LSDB
>> inconsistency.
>>>>> More work needs to be done here...
>>>>>>
>>>>>> In summary, I don't expect to have to "re= invent TCP" - but I do think
>> you
>>>>> have provided a useful perspective for us to consider = as we progress on
>> this
>>>>> topic,
>>>>>>
>>>>>> Thanx.
>>>>>>
>>>>>=C2=A0 =C2=A0 =C2=A0 > Les
>>>>>>
>>>>>>
>>>>>>> -----Original Message-----
>>>>>>> From: Lsr <lsr-bounces@ietf.org> On Behalf Of Henk Sm= it
>>>>>>> Sent: Thursday, April 30, 2020 6:58 AM
>>>>>>> To: lsr@ietf.org
>>>>>>> Subject: [Lsr] Why only a congestion-avoidance= algorithm on the
>> sender
>>>>> isn't
>>>>>>> enough
>>>>>>>
>>>>>>>
>>>>>>> Hello all,
>>>>>>>
>>>>>>> Two years ago, Gunter Van de Velde and myself = published this
>> draft:
>>>>>>> ht= tps://tools.ietf.org/html/draft-hsmit-lsr-isis-flooding-over-tcp-00
>>>>>>> That started this discussion about flow/conges= tion control and ISIS
>>>>>>> flooding.
>>>>>>>
>>>>>>> My thoughts were that once we start implementi= ng new algorithms
>> to
>>>>>>> optimize ISIS flooding speed, we'll end up= with our own version of
>> TCP.
>>>>>>> I think most people here have a good general u= nderstanding of TCP.
>>>>>>> But if not, this is a good overview how TCP do= es it:
>>>>>>> https://en.wikipedi= a.org/wiki/TCP_congestion_control
>>>>>>>
>>>>>>>
>>>>>>> What does TCP do:
>>>>>>> =3D=3D=3D=3D
>>>>>>> TCP does 2 things: flow control and congestion= control.
>>>>>>>
>>>>>>> 1) Flow control is: the receiver trying to pre= vent itself from being
>>>>>>> overloaded. The receiver indicates, through th= e receiver-window-
>> size
>>>>>>> in the TCP acks, how much data it can or wants= to receive.
>>>>>>> 2) Congestion control is: the sender trying to= prevent the links
>> between
>>>>>>> sender and receiver from being overloaded. The= sender makes an
>>>>> educated
>>>>>>> guess at what speed it can send.
>>>>>>>
>>>>>>>
>>>>>>> The part we seem to be missing:
>>>>>>> =3D=3D=3D=3D
>>>>>>> For the sender to make a guess at what speed i= t can send, it looks at
>>>>>>> how the transmission is behaving. Are there dr= ops ? What is the RTT
>> ?
>>>>>>> Do drop-percentage and RTT change ? Do acks co= me in at the same
>> rate
>>>>>>> as the sender sends segments ? Are there dupli= cate acks ? To be
>> able
>>>>>>> to do this, the sender must know what to expec= t. How acks behave.
>>>>>>>
>>>>>>> If you want an ISIS sender to make a guess at = what speed it can
>> send,
>>>>>>> without changing the protocol, the only thing = the sender can do is
>> look
>>>>>>> at the PSNPs that come back from the receiver.= But the RTT of
>> PSNPs can
>>>>>>> not be predicted. Because a good ISIS implemen= tation does not
>>>>>>> immediately
>>>>>>> send a PSNP when it receives a LSP. 1) the rec= eiver should jitter the
>>>>>>> PSNP,
>>>>>>> like it should jitter all packets. And 2) the = receiver should wait a
>>>>>>> little
>>>>>>> to see if it can combine multiple acks into a = single PSNP packet.
>>>>>>>
>>>>>>> In TCP, if a single segment gets lost, each ne= w segment will cause
>> the
>>>>>>> receiver to send an ack with the seqnr of the = last received byte. This
>>>>>>> is called "duplicate acks". This tri= ggers the sender to do
>>>>>>> fast-retransmission. In ISIS, this can't b= e be done. The information
>>>>>>> a sender can get from looking at incoming PSNP= s is a lot less than
>> what
>>>>>>> TCP can learn from incoming acks.
>>>>>>>
>>>>>>>
>>>>>>> The problem with sender-side congestion contro= l:
>>>>>>> =3D=3D=3D=3D
>>>>>>> In ISIS, all we know is that the default retra= nsmit-interval is 5
>>>>>>> seconds.
>>>>>>> And I think most implementations use that as t= he default. This
>> means
>>>>>>> that
>>>>>>> the receiver of an LSP has one requirement: se= nd a PSNP within 5
>>>>>>> seconds.
>>>>>>> For the rest, implementations are free to send= PSNPs however and
>>>>>>> whenever
>>>>>>> they want. This means a sender can not really = make conclusions
>> about
>>>>>>> flooding speed, dropped LSPs, capacity of the = receiver, etc.
>>>>>>> There is no ordering when flooding LSPs, or se= nding PSNPs. This
>> makes
>>>>>>> a sender-side algorithm for ISIS a lot harder.=
>>>>>>>
>>>>>>> When you think about it, you realize that a se= nder should wait the
>>>>>>> full 5 seconds before it can make any real con= clusions about
>> dropped
>>>>>>> LSPs.
>>>>>>> If a sender looks at PSNPs to determine its fl= ooding speed, it will
>>>>>>> probably
>>>>>>> not be able to react without a delay of a few = seconds. A sender
>> might
>>>>>>> send
>>>>>>> hunderds or thousands of LSPs in those 5 secon= ds, which might all
>> or
>>>>>>> partially be dropped, complicating matters eve= n further.
>>>>>>>
>>>>>>>
>>>>>>> A sender-sider algorithm should specify how to= do PSNPs.
>>>>>>> =3D=3D=3D=3D
>>>>>>> So imho a sender-side only algorithm can't= work just like that in a
>>>>>>> multi-vendor environment. We must not only spe= cify a congestion-
>>>>> control
>>>>>>> algorithm for the sender. We must also specify= for the receiver a
>> more
>>>>>>> specific algorithm how and when to send PSNPs.= At least how to do
>>>>> PSNPs
>>>>>>> under load.
>>>>>>>
>>>>>>> Note that this might result in the receiver se= nding more (and
>> smaller)
>>>>>>> PSNPs.
>>>>>>> More packets might mean more congestion (insid= e routers).
>>>>>>>
>>>>>>>
>>>>>>> Will receiver-side flow-control work ?
>>>>>>> =3D=3D=3D=3D
>>>>>>> I don't know if that's enough. It will= certainly help.
>>>>>>>
>>>>>>> I think to tackle this problem, we need 3 part= s:
>>>>>>> 1) sender-side congestion-control algorithm >>>>>>> 2) more detailed algorithm on receiver when an= d how to send
>> PSNPs
>>>>>>> 3) receiver-side flow-control mechanism
>>>>>>>
>>>>>>> As discussed at length, I don't know if th= e ISIS process on the
>>>>>>> receiving
>>>>>>> router can actually know if its running out of= resources (buffers on
>>>>>>> interfaces, linecards, etc). That's implem= entation dependent. A
>> receiver
>>>>>>> can definitely advertise a fixed value. So the= sender has an upper
>> bound
>>>>>>> to use when doing congestion-control. Just lik= e TCP has both a
>>>>>>> flow-control
>>>>>>> window and a congestion-control window, and a = sender uses both.
>>>>> Maybe
>>>>>>> the
>>>>>>> receiver can even advertise a dynamic value. M= aybe now, maybe
>> only in
>>>>>>> the
>>>>>>> future. An advertised upper limit seems useful= to me today.
>>>>>>>
>>>>>>>
>>>>>>> What I didn't like about our own proposal = (flooding over TCP):
>>>>>>> =3D=3D=3D=3D
>>>>>>> The problem I saw with flooding over TCP conce= rns multi-point
>> networks
>>>>>>> (LANs).
>>>>>>>
>>>>>>> When flooding over a multi-point network, sett= ing up TCP
>> connections
>>>>>>> introduces serious challenges. Who are the end= points of the TCP
>>>>>>> connections ?
>>>>>>> Full mesh ? Or do all ISes on a LAN create a T= CP-connection to the
>> DIS ?
>>>>>>> There is no backup DIS in ISIS (unlike OSPF). = Things get messy
>> quickly.
>>>>>>>
>>>>>>> However, the other two proposals do not solve = this problem either.
>>>>>>> How will a sender-side congestion-avoidence al= gorithm determine
>>>>> whether
>>>>>>> there were drops ? There are no acks (PSNPs) o= n a LAN. We assume
>> most
>>>>>>> LSPs
>>>>>>> that are broadcasted are received by all other= ISes on the LAN.
>> There
>>>>>>> are
>>>>>>> no acks. Only after the DIS has sent its perio= dic CSNPs, ISes can send
>>>>>>> PSNPs to request retransmissions. It seems imp= ossible (or very
>> hard) to
>>>>>>> me for all ISes on a LAN to keep track of drop= ped LSPs and adjust
>> their
>>>>>>> sending speed accordingly..
>>>>>>>
>>>>>>> When flooding on a LAN, the receiver-side algo= rithm seems best.
>>>>> Because
>>>>>>> all ISes can see what the lowest advertised se= nding-speed is. And
>> make
>>>>>>> sure they send slow enough to not overload the= slowest IS. I'm not
>> sure
>>>>>>> this is a good solution, but is seems easier a= nd more realistic than
>>>>>>> ISIS-flooding-over-TCP or sender-side congesti= on-avoidance.
>>>>>>>
>>>>>>>
>>>>>>> My conclusion:
>>>>>>> =3D=3D=3D=3D
>>>>>>> Sender-side congestion-control won't work = without specifying in
>> more
>>>>>>> detail how and when to send PSNPs.
>>>>>>> Receiver-side flow-control will certainly help= . I dont' know if it's
>>>>>>> good enough. I don't know if advertising a= static value is good
>> enough.
>>>>>>> But it's a start.
>>>>>>>
>>>>>>> I still think we'll end up re-implementing= a new (and weaker) TCP.
>>>>>>>
>>>>>>>
>>>>>>> henk.
>>>>>>>
>>>>>>> ______________________________________________= _
>>>>>>> Lsr mailing list
>>>>>>> Lsr@ietf.org
>>>>>>> https://www.ietf.org/mailman/l= istinfo/lsr
>>>>>>
>>>>>> _______________________________________________ >>>>>> Lsr mailing list
>>>>>> = Lsr@ietf.org
>>>>>> https://www.ietf.org/mailman/listi= nfo/lsr
>>>>>
>>>>>
>> __________________________________________________________
>>>>>
>> __________________________________________________________
>>>>> _____
>>>>>
>>>>> Ce message et ses pieces jointes peuvent contenir des = informations
>>>>> confidentielles ou privilegiees et ne doivent donc
>>>>> pas etre diffuses, exploites ou copies sans autorisati= on. Si vous avez
>> recu ce
>>>>> message par erreur, veuillez le signaler
>>>>> a l'expediteur et le detruire ainsi que les pieces= jointes. Les messages
>>>>> electroniques etant susceptibles d'alteration,
>>>>> Orange decline toute responsabilite si ce message a et= e altere,
>> deforme ou
>>>>> falsifie. Merci.
>>>>>
>>>>> This message and its attachments may contain confident= ial or privileged
>>>>> information that may be protected by law;
>>>>> they should not be distributed, used or copied without= authorisation.
>>>>> If you have received this email in error, please notif= y the sender and
>> delete
>>>>> this message and its attachments.
>>>>> As emails may be altered, Orange is not liable for mes= sages that have
>> been
>>>>> modified, changed or falsified.
>>>>> Thank you.
>>>>
>>>>
>> __________________________________________________________
>> __________________________________________________________
>> _____
>>>>
>>>> Ce message et ses pieces jointes peuvent contenir des info= rmations
>> confidentielles ou privilegiees et ne doivent donc
>>>> pas etre diffuses, exploites ou copies sans autorisation. = Si vous avez recu
>> ce message par erreur, veuillez le signaler
>>>> a l'expediteur et le detruire ainsi que les pieces joi= ntes. Les messages
>> electroniques etant susceptibles d'alteration,
>>>> Orange decline toute responsabilite si ce message a ete al= tere, deforme
>> ou falsifie. Merci.
>>>>
>>>> This message and its attachments may contain confidential = or privileged
>> information that may be protected by law;
>>>> they should not be distributed, used or copied without aut= horisation.
>>>> If you have received this email in error, please notify th= e sender and
>> delete this message and its attachments.
>>>> As emails may be altered, Orange is not liable for message= s that have
>> been modified, changed or falsified.
>>>> Thank you.
>>>>
>> __________________________________________________________
>> __________________________________________________________
>> _____
>>>>
>>>> Ce message et ses pieces jointes peuvent contenir des info= rmations
>> confidentielles ou privilegiees et ne doivent donc
>>>> pas etre diffuses, exploites ou copies sans autorisation. = Si vous avez recu
>> ce message par erreur, veuillez le signaler
>>>> a l'expediteur et le detruire ainsi que les pieces joi= ntes. Les messages
>> electroniques etant susceptibles d'alteration,
>>>> Orange decline toute responsabilite si ce message a ete al= tere, deforme
>> ou falsifie. Merci.
>>>>
>>>> This message and its attachments may contain confidential = or privileged
>> information that may be protected by law;
>>>> they should not be distributed, used or copied without aut= horisation.
>>>> If you have received this email in error, please notify th= e sender and
>> delete this message and its attachments.
>>>> As emails may be altered, Orange is not liable for message= s that have
>> been modified, changed or falsified.
>>>> Thank you.
>>>>
>>>> _______________________________________________
>>>> Lsr mailing list
>>>> Lsr@ietf= .org
>>>> https://www.ietf.org/mailman/listinfo/lsr=
>>>
>>
>> __________________________________________________________
>> __________________________________________________________
>> _____
>>
>> Ce message et ses pieces jointes peuvent contenir des informations=
>> confidentielles ou privilegiees et ne doivent donc
>> pas etre diffuses, exploites ou copies sans autorisation. Si vous = avez recu ce
>> message par erreur, veuillez le signaler
>> a l'expediteur et le detruire ainsi que les pieces jointes. Le= s messages
>> electroniques etant susceptibles d'alteration,
>> Orange decline toute responsabilite si ce message a ete altere, de= forme ou
>> falsifie. Merci.
>>
>> This message and its attachments may contain confidential or privi= leged
>> information that may be protected by law;
>> they should not be distributed, used or copied without authorisati= on.
>> If you have received this email in error, please notify the sender= and delete
>> this message and its attachments.
>> As emails may be altered, Orange is not liable for messages that h= ave been
>> modified, changed or falsified.
>> Thank you.
>
> _______________________________________________
> Lsr mailing list
> Lsr@ietf.org
> https://www.ietf.org/mailman/listinfo/lsr
>

_______________________________________________
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https://www.ietf.org/mailman/listinfo/lsr
--000000000000d649e305a4fefe60-- From nobody Wed May 6 11:57:59 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 71E783A0A9A for ; Wed, 6 May 2020 11:57:58 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.1 X-Spam-Level: X-Spam-Status: No, score=-2.1 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=unavailable autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=earthlink.net; domainkeys=pass (2048-bit key) header.from=erblichs@earthlink.net header.d=earthlink.net Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id OMgAuZ3A_5E5 for ; Wed, 6 May 2020 11:57:57 -0700 (PDT) Received: from elasmtp-curtail.atl.sa.earthlink.net (elasmtp-curtail.atl.sa.earthlink.net [209.86.89.64]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 2F3863A0A9D for ; Wed, 6 May 2020 11:57:57 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=earthlink.net; s=dk12062016; t=1588791477; bh=n/fXpOBNUxAji9syjshdYEq7PnxA6+2ei3KD aNprFzI=; h=Received:Content-Type:Mime-Version:Subject:From: In-Reply-To:Date:Cc:Content-Transfer-Encoding:Message-Id: References:To:X-Mailer:X-ELNK-Trace:X-Originating-IP; b=naw2VRjAOX sI1kkXYEEP/+4xsIdbeiTCg6Z8X/rbH8c2WrEVacA9f/bNb2VwhFEN8cWpUx+knG1u6 oPyZ0zUdQDU8uQY1IIRURRzHyEI+vuMf+VDfcSdRqcyFiZyuIOVpBl5a+BW2JTy22SS G0nFgvNT5NHH7CdK2HFxgpTHQccr/0Iukx6HpwEZ8RfiCrTaPuDSYE8Jv/JZrmZswkT qFy5iVT8FI7BK2giekvi+YQ13OoVQ7MHk4sQj1+VE2YNet0G3CTmL9nBbW20aNrU3mn QlhqsLG+BorwsjHMKaSSgmHppaNEpoayAwliPTqPj6w690ydXUfKBA6AdI0BRObw== DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=dk12062016; d=earthlink.net; b=q4BvK+2WpTsCtI1+QGVgvW341pT2mTz1Gp2epTNYleU4AgNXnwJe08Jam5HyqCl2pCQ7xL0MSmNinrNBGmFkPaGce1BtdYiIzdhBOENF4NswX8xugq8beHFUV/sxY69YW0aoNmAsIB40r2aP4vjIjNdDnV1u6Zbp5Ao805wEdv8rm4CsNCvjS5iSJ9e74OaDDErU5j/dTMdpZfkmqgXDytvYP9nKp7S43y1bKFpds8TEor+PE9ZDIWyR+lhTcbJ1U4x835eBTXkb71cupLhhSK+8B92k82jkIEYDgWrW8GAyxHmcU5GE0hyeGGTtMYbZb6FJH6US5e35DwGPP1BEgg==; h=Received:Content-Type:Mime-Version:Subject:From:In-Reply-To:Date:Cc:Content-Transfer-Encoding:Message-Id:References:To:X-Mailer:X-ELNK-Trace:X-Originating-IP; Received: from [98.234.227.202] (helo=[10.0.0.53]) by elasmtp-curtail.atl.sa.earthlink.net with esmtpsa (TLSv1:ECDHE-RSA-AES256-SHA:256) (Exim 4) (envelope-from ) id 1jWPEw-0008Gx-FZ; Wed, 06 May 2020 14:57:54 -0400 Content-Type: text/plain; charset=utf-8 Mime-Version: 1.0 (Mac OS X Mail 9.3 \(3124\)) From: Mitchell Erblich In-Reply-To: Date: Wed, 6 May 2020 11:57:52 -0700 Cc: Christian Hopps , "Les Ginsberg (ginsberg)" , "bruno.decraene@orange.com" , "lsr@ietf.org" Content-Transfer-Encoding: quoted-printable Message-Id: References: <24209_1588692477_5EB185FD_24209_35_1_53C29892C857584299CBF5D05346208A48E3D455@OPEXCAUBM43.corporate.adroot.infra.ftgroup> <61EB462E-18EC-4F1D-8EF4-0EA126D5F7F6@chopps.org> To: Robert Raszuk X-Mailer: Apple Mail (2.3124) X-ELNK-Trace: 074f60c55517ea841aa676d7e74259b7b3291a7d08dfec7971351d3d0339b4794dcfd6597512b3f5350badd9bab72f9c350badd9bab72f9c350badd9bab72f9c X-Originating-IP: 98.234.227.202 Archived-At: Subject: Re: [Lsr] Flooding across a network X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 06 May 2020 18:57:59 -0000 Robert, I agree with you=E2=80=A6 Disruptions based on protocol changes with = non-current/legacy type products and/or intenal black-hole , loss of = packets/rexmits, aka reliability should be primary. Even good/great = ideas of IPv4 / IPv6 intermediate systems/routers find small = incompatibilities either with the protocol and/or CLI errors. With that said, I definitely like the OSPF DR/BDR = functionality in Eth/multi-access/non-p2p environments for single router = failures IMO adds reliability and mitigates certain types of = disruptions. However, with wireless devices, one must still respect = that bottlenecks need to be resolved when dealing with these slower/down = ward scaling environments. This is just not just a packet-per-sec / = bytes-per-second issue but frequently are smaller packet/segment sizes , = a scaling of the number of simultaneous connections, and loss of = packets/segments in these newer environments And, sorry, Eth is there with 100Gb and LACP exists, = that will eventually push upward scaling proposals. =09 Mitchell Erblich erblichs@earthlink.net > On May 6, 2020, at 12:52 AM, Robert Raszuk wrote: >=20 > Christian, >=20 > It is not about "hand-wringing and theorizing about being = too-successful".=20 >=20 > It is about impact to the overall network service when you make ISIS = convergence not consistent across nodes of the topology, I think our = goal is not to converge ISIS faster by improving flooding speed .... it = is much more about how to deliver user packets with minimal disruption = upon topology changes.=20 >=20 > Best, > R. >=20 > On Wed, May 6, 2020 at 5:48 AM Christian Hopps = wrote: > [as WG member] >=20 > I think it would be more productive if we stay focused on trying to = improve flooding speed/efficiency here. How about let's get some of the = proposals being mulled over actually written, and provide some data, and = leave all the hand-wringing and theorizing about being too-successful = for after we've shown we could be? :) >=20 > Thanks, > Chris. >=20 >=20 > > On May 5, 2020, at 8:03 PM, Robert Raszuk wrote: > >=20 > > But this proves that consistent convergence time in a domain is = rather a good thing regardless if it takes 2 sec or 50 sec on all nodes.=20= > >=20 >=20 > _______________________________________________ > Lsr mailing list > Lsr@ietf.org > https://www.ietf.org/mailman/listinfo/lsr From nobody Wed May 6 21:41:55 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id CAF1D3A0853 for ; Wed, 6 May 2020 21:41:52 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.087 X-Spam-Level: X-Spam-Status: No, score=-2.087 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_KAM_HTML_FONT_INVALID=0.01, URIBL_BLOCKED=0.001] autolearn=unavailable autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id AHK-U9mNig2E for ; Wed, 6 May 2020 21:41:47 -0700 (PDT) Received: from mail-pl1-x62c.google.com (mail-pl1-x62c.google.com [IPv6:2607:f8b0:4864:20::62c]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 5F1CC3A0843 for ; Wed, 6 May 2020 21:41:47 -0700 (PDT) Received: by mail-pl1-x62c.google.com with SMTP id b6so1553432plz.13 for ; Wed, 06 May 2020 21:41:47 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=date:from:to:cc:message-id:in-reply-to:references:subject :mime-version; bh=JjAJPzVvcH0oSVMGrpwmJSLEhXc/V4A6ikB3H1fMj4o=; b=bJjq3+x10qMuf70jXcdPqFWQNr8gSoYTKSmCCfaFMqG2hCb7Ee+B41sOXMRHgISMQc bXA6JrWVqxGCixRJpKAk4WgqiVRJYdyFsKD8nNNEniLz944QtLJLm/8GrrzVG/abVgmb Il7zqbliLRAjCuTrIl13LzylrgbU2Yk2VuyJxVYT4SzzDtnyLWrHd2s7JF1+gIglDN+6 wCd2wbNszBLJ73H52TroiNH4HhJhzT/PWIuXT8FbkPU5X3dBfvBP/41zV4lFgayBCi3q Xy1XyFZt7BJF5Dpafabcqb9344TUDjXDj1VUhRZrWHDy6ThlhJ4tMg9QNDTUvoWET5GY XJFQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:message-id:in-reply-to :references:subject:mime-version; bh=JjAJPzVvcH0oSVMGrpwmJSLEhXc/V4A6ikB3H1fMj4o=; b=RIbnmOvMlkby7X4PQPCVFBVUe/aMIMok5aXwelBDeDdWcIFtHC+t/NsQPkZuGEr5cg ilFIaez1bE1aJF5wmFrXJ9B8hTxNR469bzxEl3VTxQPta34U6IxJ7dh7MjNa7AbMC30Z 7bMSVxIE05aHLNsy/Hg9eGo+qiGZKuPSmbPGM4MK/VbmN9CbOzV53k/MzLdftDpTWF4B EyVf31Y8FEasUqXOJD1+6J+bYAJfJhQAT+oCAvxvDtqtuLgN+DDB0byxKIYt5c0tDvW6 msW2GzKdZAaTl1PHDlH09NniKAWDCKmxhZ81khY+LAoT/q2Qlh73Ms43n1PcV40rBbSz XFrA== X-Gm-Message-State: AGi0PuacEyCAqOKpLRlGgYpTpu56PWYj4rwX6mnJaX/MVk+MMdqss0yH YhUaifO+MpQpjm1AnSN+VCfk62nk X-Google-Smtp-Source: APiQypIyFiGnpOUk4dtjKwc16SvFjT3UUl/8fnBIf/MlTU2DJVDD2Kj1jwRasuKk4q9h9YFAYQ99mg== X-Received: by 2002:a17:90a:d17:: with SMTP id t23mr14123971pja.77.1588826506402; Wed, 06 May 2020 21:41:46 -0700 (PDT) Received: from [192.168.1.5] (c-73-63-232-212.hsd1.ca.comcast.net. [73.63.232.212]) by smtp.gmail.com with ESMTPSA id f4sm2861323pgd.0.2020.05.06.21.41.44 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Wed, 06 May 2020 21:41:45 -0700 (PDT) Date: Wed, 6 May 2020 21:41:38 -0700 From: Jeff Tantsura To: "Les Ginsberg (ginsberg)" , Robert Raszuk Cc: "=?utf-8?Q?bruno.decraene=40orange.com?=" , "=?utf-8?Q?lsr=40ietf.org?=" Message-ID: In-Reply-To: References: <24209_1588692477_5EB185FD_24209_35_1_53C29892C857584299CBF5D05346208A48E3D455@OPEXCAUBM43.corporate.adroot.infra.ftgroup> X-Readdle-Message-ID: c2f11fa3-1843-4fd4-9d05-47ea5748e214@Spark MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="5eb39187_3f07acc3_2480" Archived-At: Subject: Re: [Lsr] Flooding across a network X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 07 May 2020 04:41:53 -0000 --5eb39187_3f07acc3_2480 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Content-Disposition: inline Robert, Assuming C and E provide access to the same set of destinations, that are= closer of further away from C and E. B (which is fast), after it notifies A that it can=E2=80=99t reach C dire= ctly will cause A to send traffic to D. D - dependent on total cost would= start happily sending some traffic towards destinations behind C to B so= L=46A on B wouldn=E2=80=99t really help. Cheers, Jeff On May 5, 2020, 5:04 PM -0700, Robert Raszuk , wrote= : > Hi Les, > > A side comment but your example shows another - one may say even much m= ore serious issue. > > Assume we have L=46A/TI-L=46A enabled in the network and precomputed on= B which get's activated and shifts traffic to E when detects that C is d= own. Detection is fast .. 10s-100s of milliseconds. > > Now if B converges fast and recomputes topology much faster then D it m= ay remove protection and send packets to D natively. Well clearly as we e= stablished D is slow and will loop it back. > > That is why I mentioned the other day that a fast control plane is not = always a good thing (I am sure many will say the opposite - but it is ok = ;). > > But this proves that consistent convergence time in a domain is rather = a good thing regardless if it takes 2 sec or 50 sec on all nodes. > > Best, > Robert. > > > > > On Wed, May 6, 2020 at 1:35 AM Les Ginsberg (ginsberg) wrote: > > > Bruno - > > > > > > Seems like it was not too long ago that we were discussing this in = person.=C2=A0 Ahhh...the good old days... > > > > > > =46irst, let's agree that the interesting case does not involve 1 o= r even a small number of LSPs. =46or those cases flooding speed does not = matter. > > > The interesting cases involve a large number of LSPs (hundreds or t= housands). And in such cases L=46A/microloop avoidance techniques are not= applicable. > > > > > > Take the following simple topology: > > > > > > =C2=A0=C2=A0 =7C=C2=A0 =7C ... =7C=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =7C > > > =C2=A0=C2=A0=C2=A0=C2=A0 +---+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 +---+ > > > =C2=A0=C2=A0=C2=A0=C2=A0 =7C C =7C=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =7C E =7C > > > =C2=A0=C2=A0=C2=A0=C2=A0 +---+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 +---+ > > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =7C=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =C2=A0=7C= 1000 > > > =C2=A0=C2=A0=C2=A0=C2=A0 +---+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 +---+ > > > =C2=A0=C2=A0=C2=A0=C2=A0 =7C B =7C-------------=7C D =7C > > > =C2=A0=C2=A0=C2=A0=C2=A0 +---+ =C2=A0=C2=A01000=C2=A0=C2=A0=C2=A0 =C2= =A0=C2=A0+---+ > > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =7C=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =7C= > > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =7C=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =7C= > > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =5C=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 / > > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =5C=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 / > > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =5C=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 / > > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =5C=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0 / > > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0 +---+ > > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0 =7C A =7C > > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0 +---+ > > > > > > There is a topology northbound of C and E (not shown) and a topolog= y southbound of A (not shown). > > > Cost on all links is 10 except B-D and D-E where cost is high. > > > > > > C is a node with 1000 neighbors. > > > When all links are up, shortest path for all northbound destination= s is via C. > > > All nodes in the network support fast flooding except for Node D. > > > Let=E2=80=99s say fast flooding is 500 LSPs/second and slow floodin= g (Node D) is 20 LSPs/seconds. > > > If =C2=A0Node C fails we have 1000 LSPs to flood. > > > All nodes except for D can receive these in 2 seconds (plus interno= de delay time). > > > D can receive LSPs in 50 seconds. > > > > > > When A and B and all southbound nodes receive/process the LSP updat= es they will start sending traffic to Northbound destinations via D. > > > But for the better part of 50 seconds, Node D has yet to receive al= l LSP updates and still believes that shortest path is via B-C. It will l= oop traffic. > > > > > > Had all nodes used slow flooding, it still would have taken 50 seco= nds to converge, but there would be significantly less looping. There cou= ld be a good amount of blackholing, but this is preferable to looping. > > > > > > One can always come up with examples =E2=80=93 based on a specific = topology and a specific failure - where things might be better/worse/unch= anged in the face of inconsistent flooding speed support. > > > But I hope this simple example illustrates the pitfalls. > > > > > > =C2=A0=C2=A0=C2=A0 Les > > > > > > > -----Original Message----- > > > > =46rom: bruno.decraene=40orange.com = > > > > Sent: Tuesday, May 05, 2020 8:28 AM > > > > To: Les Ginsberg (ginsberg) ; lsr=40ietf.or= g > > > > Subject: =46looding across a network > > > > > > > > Les, > > > > > > > > > =46rom: Lsr =5Bmailto:lsr-bounces=40ietf.org=5D On Behalf Of Le= s Ginsberg > > > > (ginsberg) > > > > > Sent: Monday, May 4, 2020 4:39 PM > > > > =5B...=5D > > > > > when only some nodes in the network support faster flooding the= behavior > > > > of the whole network may not be =22better=22 when faster flooding= is enabled > > > > because it prolongs the period of LSDB inconsistency. > > > > > > > > 1) Do you have data on this=3F > > > > > > > > 2) If not, can you provide an example where increasing the floodi= ng rate on > > > > one adjacency prolongs the period of LSDB inconsistency across th= e > > > > network=3F > > > > > > > > 3) In the meantime, let's try the theoretical analysis on a simpl= e scenario > > > > where a single LSP needs to be flooded across the network. > > > > > > > > - Let's call Dij the time needed to flood the LSP from node i to = the adjacent > > > > node j. Clearly Dij>0. > > > > - Let's call k the node originating this LSP at t0=3D0s > > > > > > > > >=46rom t0, the LSDB is inconsistent across the network as all no= des but k are > > > > missing the LSP and hence only know about the 'old' topology. > > > > > > > > Let's call=C2=A0 SPT(k) the SPT rooted on k, using Dij as the met= ric between > > > > adjacent nodes i and j. Let's call SP(k,i) the shortest path from= k to i; and > > > > D(k,i) the shortest distance between k and i.. > > > > > > > > It seems that the time needed: > > > > - for node j to learn about the LSP, and get in sync with k, is D= (k,j) > > > > - for all nodes across the network to learn about the LSP, and ge= t in sync with > > > > k, is Max=5Bfor all j=5D D(k,j) > > > > > > > > Then how can reducing the flooding delay on one adjacency could p= rolongs > > > > the period of LSDB inconsistency=3F > > > > It seems to me that it can only improve/decrease it. Otherwise, t= his would > > > > mean that decreasing the cost on a link can increase the cost of = the shortest > > > > path. > > > > > > > > Note: I agree that there are other cases, such as=C2=A0 multiple = LSPs originated by > > > > the same node, and multiple LSPs originated by multiple nodes, bu= t let's start > > > > with the simple case. > > > > > > > > Thanks, > > > > --Bruno > > > > > > > > > -----Original Message----- > > > > > =46rom: Lsr =5Bmailto:lsr-bounces=40ietf.org=5D On Behalf Of Le= s Ginsberg > > > > (ginsberg) > > > > > Sent: Monday, May 4, 2020 4:39 PM > > > > > > > > > > Henk - > > > > > > > > > > Thanx for your thoughtful posts. > > > > > I have read your later posts on this thread as well - but decid= ed to reply to > > > > this one. > > > > > Top posting for better readability. > > > > > > > > > > There is broad agreement that faster flooding is desirable. > > > > > There are now two proposals as to how to address the issue - ne= ither of > > > > which is proposing to use TCP (or equivalent). > > > > > > > > > > I have commented on why IS-IS flooding requirements are signifi= cantly > > > > different than that for which TCP is used. > > > > > I think it is also useful to note that even the simple test cas= e which Bruno > > > > reported on in last week's interim meeting demonstrated that with= out any > > > > changes to the protocol at all IS-IS was able to flood an order o= f magnitude > > > > faster than it commonly does today. > > > > > This gives me hope that we are looking at the problem correctly= and will not > > > > need =22TCP=22. > > > > > > > > > > Introducing a TCP based solution requires: > > > > > > > > > > a)A major change to the adjacency formation logic > > > > > > > > > > b)Removal of the independence of the IS-IS protocol from the ad= dress > > > > families whose reachability advertisements it supports - somethin= g which I > > > > think is a great strength of the protocol - particularly in envir= onments where > > > > multiple address family support is needed > > > > > > > > > > I really don't want to do either of the above. > > > > > > > > > > Your comments regarding PSNP response times are quite correct -= and > > > > both of the draft proposals discuss this - though I agree more de= tail will be > > > > required. > > > > > It is intuitive that if you want to flood faster you also need = to ACK faster - > > > > and probably even retransmit faster when that is needed. > > > > > The basic relationship between retransmit interval and PSNP int= erval is > > > > expressed in ISO 10589: > > > > > > > > > > =22 partialSNPInterval - This is the amount of time between per= iodic > > > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0> action for tran= smission of Partial Sequence Number PDUs. > > > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0> It shall be les= s than minimumLSPTransmission-Interval.=22 > > > > > > > > > > Of course ISO 10589 recommended values (2 seconds and 5 seconds= > > > > respectively) associated with a much slower flooding rate and > > > > implementations I am aware of use values in this order of magnitu= de.. These > > > > numbers need to be reduced if we are to flood faster, but the rel= ationship > > > > between the two needs to remain the same. > > > > > > > > > > It is also true - as you state - that sending ACKs more quickly= will result in > > > > additional PDUs which need to be received/processed by IS-IS - an= d this has > > > > some impact. But I think it is reasonable to expect that an imple= mentation > > > > which can support sending and receiving LSPs at a faster rate sho= uld also be > > > > able to send/receive PSNPs at a faster rate. But we still need to= be smarter > > > > than sending one PSNP/one LSP in cases where we have a burst. > > > > > > > > > > LANs are a more difficult problem than P2P - and thus far draft= -ginsberg-lsr- > > > > isis-flooding-scale has been silent on this - but not because we = aren't aware > > > > of this - just have focused on the P2P behavior first. > > > > > What the best behavior on a LAN may be is something I am still = considering. > > > > Slowing flooding down to the speed at which the slowest IS on the= LAN can > > > > support may not be the best strategy - as it also slows down the = propagation > > > > rate for systems downstream from the nodes on the LAN which can h= andle > > > > faster flooding - thereby having an impact on flooding speed thro= ughout the > > > > network in a way which may be out of proportion. This is a smalle= r example > > > > of the larger issue that when only some nodes in the network supp= ort faster > > > > flooding the behavior of the whole network may not be =22better=22= when faster > > > > flooding is enabled because it prolongs the period of LSDB incons= istency. > > > > More work needs to be done here... > > > > > > > > > > In summary, I don't expect to have to =22reinvent TCP=22 - but = I do think you > > > > have provided a useful perspective for us to consider as we progr= ess on this > > > > topic, > > > > > > > > > > Thanx. > > > > > > > > > =C2=A0=C2=A0=C2=A0=C2=A0> Les > > > > > > > > > > > > > > > > -----Original Message----- > > > > > > =46rom: Lsr On Behalf Of Henk Smit > > > > > > Sent: Thursday, April 30, 2020 6:58 AM > > > > > > To: lsr=40ietf.org > > > > > > Subject: =5BLsr=5D Why only a congestion-avoidance algorithm = on the sender > > > > isn't > > > > > > enough > > > > > > > > > > > > > > > > > > Hello all, > > > > > > > > > > > > Two years ago, Gunter Van de Velde and myself published this = draft: > > > > > > https://tools.ietf.org/html/draft-hsmit-lsr-isis-flooding-ove= r-tcp-00 > > > > > > That started this discussion about flow/congestion control an= d ISIS > > > > > > flooding. > > > > > > > > > > > > My thoughts were that once we start implementing new algorith= ms to > > > > > > optimize ISIS flooding speed, we'll end up with our own versi= on of TCP. > > > > > > I think most people here have a good general understanding of= TCP. > > > > > > But if not, this is a good overview how TCP does it: > > > > > > https://en.wikipedia.org/wiki/TCP=5Fcongestion=5Fcontrol > > > > > > > > > > > > > > > > > > What does TCP do: > > > > > > =3D=3D=3D=3D > > > > > > TCP does 2 things: flow control and congestion control. > > > > > > > > > > > > 1) =46low control is: the receiver trying to prevent itself f= rom being > > > > > > overloaded. The receiver indicates, through the receiver-wind= ow-size > > > > > > in the TCP acks, how much data it can or wants to receive.. > > > > > > 2) Congestion control is: the sender trying to prevent the li= nks between > > > > > > sender and receiver from being overloaded. The sender makes a= n > > > > educated > > > > > > guess at what speed it can send. > > > > > > > > > > > > > > > > > > The part we seem to be missing: > > > > > > =3D=3D=3D=3D > > > > > > =46or the sender to make a guess at what speed it can send, i= t looks at > > > > > > how the transmission is behaving. Are there drops =3F What is= the RTT =3F > > > > > > Do drop-percentage and RTT change =3F Do acks come in at the = same rate > > > > > > as the sender sends segments =3F Are there duplicate acks =3F= To be able > > > > > > to do this, the sender must know what to expect. How acks beh= ave. > > > > > > > > > > > > If you want an ISIS sender to make a guess at what speed it c= an send, > > > > > > without changing the protocol, the only thing the sender can = do is look > > > > > > at the PSNPs that come back from the receiver. But the RTT of= PSNPs can > > > > > > not be predicted. Because a good ISIS implementation does not= > > > > > > immediately > > > > > > send a PSNP when it receives a LSP.. 1) the receiver should j= itter the > > > > > > PSNP, > > > > > > like it should jitter all packets. And 2) the receiver should= wait a > > > > > > little > > > > > > to see if it can combine multiple acks into a single PSNP pac= ket. > > > > > > > > > > > > In TCP, if a single segment gets lost, each new segment will = cause the > > > > > > receiver to send an ack with the seqnr of the last received b= yte. This > > > > > > is called =22duplicate acks=22. This triggers the sender to d= o > > > > > > fast-retransmission. In ISIS, this can't be be done. The info= rmation > > > > > > a sender can get from looking at incoming PSNPs is a lot less= than what > > > > > > TCP can learn from incoming acks. > > > > > > > > > > > > > > > > > > The problem with sender-side congestion control: > > > > > > =3D=3D=3D=3D > > > > > > In ISIS, all we know is that the default retransmit-interval = is 5 > > > > > > seconds. > > > > > > And I think most implementations use that as the default. Thi= s means > > > > > > that > > > > > > the receiver of an LSP has one requirement: send a PSNP withi= n 5 > > > > > > seconds. > > > > > > =46or the rest, implementations are free to send PSNPs howeve= r and > > > > > > whenever > > > > > > they want. This means a sender can not really make conclusion= s about > > > > > > flooding speed, dropped LSPs, capacity of the receiver, etc. > > > > > > There is no ordering when flooding LSPs, or sending PSNPs.. T= his makes > > > > > > a sender-side algorithm for ISIS a lot harder. > > > > > > > > > > > > When you think about it, you realize that a sender should wai= t the > > > > > > full 5 seconds before it can make any real conclusions about = dropped > > > > > > LSPs. > > > > > > If a sender looks at PSNPs to determine its flooding speed, i= t will > > > > > > probably > > > > > > not be able to react without a delay of a few seconds. A send= er might > > > > > > send > > > > > > hunderds or thousands of LSPs in those 5 seconds, which might= all or > > > > > > partially be dropped, complicating matters even further. > > > > > > > > > > > > > > > > > > A sender-sider algorithm should specify how to do PSNPs. > > > > > > =3D=3D=3D=3D > > > > > > So imho a sender-side only algorithm can't work just like tha= t in a > > > > > > multi-vendor environment. We must not only specify a congesti= on- > > > > control > > > > > > algorithm for the sender. We must also specify for the receiv= er a more > > > > > > specific algorithm how and when to send PSNPs. At least how t= o do > > > > PSNPs > > > > > > under load. > > > > > > > > > > > > Note that this might result in the receiver sending more (and= smaller) > > > > > > PSNPs. > > > > > > More packets might mean more congestion (inside routers). > > > > > > > > > > > > > > > > > > Will receiver-side flow-control work =3F > > > > > > =3D=3D=3D=3D > > > > > > I don't know if that's enough. It will certainly help. > > > > > > > > > > > > I think to tackle this problem, we need 3 parts: > > > > > > 1) sender-side congestion-control algorithm > > > > > > 2) more detailed algorithm on receiver when and how to send P= SNPs > > > > > > 3) receiver-side flow-control mechanism > > > > > > > > > > > > As discussed at length, I don't know if the ISIS process on t= he > > > > > > receiving > > > > > > router can actually know if its running out of resources (buf= fers on > > > > > > interfaces, linecards, etc). That's implementation dependent.= A receiver > > > > > > can definitely advertise a fixed value. So the sender has an = upper bound > > > > > > to use when doing congestion-control. Just like TCP has both = a > > > > > > flow-control > > > > > > window and a congestion-control window, and a sender uses bot= h. > > > > Maybe > > > > > > the > > > > > > receiver can even advertise a dynamic value. Maybe now, maybe= only in > > > > > > the > > > > > > future. An advertised upper limit seems useful to me today. > > > > > > > > > > > > > > > > > > What I didn't like about our own proposal (flooding over TCP)= : > > > > > > =3D=3D=3D=3D > > > > > > The problem I saw with flooding over TCP concerns multi-point= networks > > > > > > (LANs). > > > > > > > > > > > > When flooding over a multi-point network, setting up TCP conn= ections > > > > > > introduces serious challenges. Who are the endpoints of the T= CP > > > > > > connections =3F > > > > > > =46ull mesh =3F Or do all ISes on a LAN create a TCP-connecti= on to the DIS =3F > > > > > > There is no backup DIS in ISIS (unlike OSP=46). Things get me= ssy quickly. > > > > > > > > > > > > However, the other two proposals do not solve this problem ei= ther. > > > > > > How will a sender-side congestion-avoidence algorithm determi= ne > > > > whether > > > > > > there were drops =3F There are no acks (PSNPs) on a LAN. We a= ssume most > > > > > > LSPs > > > > > > that are broadcasted are received by all other ISes on the LA= N. There > > > > > > are > > > > > > no acks. Only after the DIS has sent its periodic CSNPs, ISes= can send > > > > > > PSNPs to request retransmissions. It seems impossible (or ver= y hard) to > > > > > > me for all ISes on a LAN to keep track of dropped LSPs and ad= just their > > > > > > sending speed accordingly. > > > > > > > > > > > > When flooding on a LAN, the receiver-side algorithm seems bes= t. > > > > Because > > > > > > all ISes can see what the lowest advertised sending-speed is.= And make > > > > > > sure they send slow enough to not overload the slowest IS.. I= 'm not sure > > > > > > this is a good solution, but is seems easier and more realist= ic than > > > > > > ISIS-flooding-over-TCP or sender-side congestion-avoidance. > > > > > > > > > > > > > > > > > > My conclusion: > > > > > > =3D=3D=3D=3D > > > > > > Sender-side congestion-control won't work without specifying = in more > > > > > > detail how and when to send PSNPs. > > > > > > Receiver-side flow-control will certainly help. I dont' know = if it's > > > > > > good enough. I don't know if advertising a static value is go= od enough. > > > > > > But it's a start. > > > > > > > > > > > > I still think we'll end up re-implementing a new (and weaker)= TCP. > > > > > > > > > > > > > > > > > > henk. > > > > > > > > > > > > =5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F= =5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F= =5F > > > > > > Lsr mailing list > > > > > > Lsr=40ietf.org > > > > > > https://www.ietf.org/mailman/listinfo/lsr > > > > > > > > > > =5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F= =5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F= =5F > > > > > Lsr mailing list > > > > > Lsr=40ietf.org > > > > > https://www.ietf.org/mailman/listinfo/lsr > > > > > > > > =5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F= =5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F= =5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F > > > > =5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F= =5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F= =5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F > > > > =5F=5F=5F=5F=5F > > > > > > > > Ce message et ses pieces jointes peuvent contenir des information= s > > > > confidentielles ou privilegiees et ne doivent donc > > > > pas etre diffuses, exploites ou copies sans autorisation. Si vous= avez recu ce > > > > message par erreur, veuillez le signaler > > > > a l'expediteur et le detruire ainsi que les pieces jointes. Les m= essages > > > > electroniques etant susceptibles d'alteration, > > > > Orange decline toute responsabilite si ce message a ete altere, d= eforme ou > > > > falsifie. Merci. > > > > > > > > This message and its attachments may contain confidential or priv= ileged > > > > information that may be protected by law; > > > > they should not be distributed, used or copied without authorisat= ion. > > > > If you have received this email in error, please notify the sende= r and delete > > > > this message and its attachments. > > > > As emails may be altered, Orange is not liable for messages that = have been > > > > modified, changed or falsified. > > > > Thank you. > > > > > > =5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F= =5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F > > > Lsr mailing list > > > Lsr=40ietf.org > > > https://www.ietf.org/mailman/listinfo/lsr > =5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F= =5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F > Lsr mailing list > Lsr=40ietf.org > https://www.ietf.org/mailman/listinfo/lsr --5eb39187_3f07acc3_2480 Content-Type: text/html; charset="utf-8" Content-Transfer-Encoding: quoted-printable Content-Disposition: inline
Robert,

Assuming C and E provide access to the same set of destinations, that are= closer of further away from C and E.
B (which is fast), after it notifies A that it can=E2=80=99t reach C dire= ctly will cause A to send traffic to D. D - dependent on total cost would= start happily sending some traffic towards destinations behind C to B so= L=46A on B wouldn=E2=80=99t really help.

Cheers,
Jeff
On May 5, 2020, 5:04 PM -0700, Robe= rt Raszuk <robert=40raszuk.net>, wrote:
Hi Les,

A side comment but your example shows another - one may say even muc= h more serious issue.&=23160;

Assume we have L=46A/TI-L=46A enabled in the network and precomputed= on B which get's activated and shifts traffic to E when detects that C i= s down. Detection is fast .. 10s-100s of milliseconds.&=23160;

Now if B converges fast and recomputes topology much faster then D i= t may remove protection and send packets to D natively. Well clearly as w= e established D is slow and will loop it back.&=23160;

That is why I mentioned the other day that a fast control plane is n= ot always a good thing (I am sure many will say the opposite - but it is = ok ;).&=23160;

But this proves that consistent convergence time in a domain is rath= er a good thing regardless if it takes 2 sec or 50 sec on all nodes.&=231= 60;

Best,
Robert.



On Wed, May 6, 2020 at 1:= 35 AM Les Ginsberg (ginsberg) <ginsberg=3D40cisco.com=40dmarc.ietf.org> wrote:
=

Bruno -

&=23160;

Seems like it was not too long ago that we were discussing this in per= son.&=23160; Ahhh...the good old days...

&=23160;

=46irst, let's agree that the interesting case does not involve 1 or e= ven a small number of LSPs. =46or those cases flooding speed does not mat= ter.

The interesting cases involve a large number of LSPs (hundreds or thou= sands). And in such cases L=46A/microloop avoidance techniques are not ap= plicable.

&=23160;

Take the following simple topology:

&=23160;

&=23160;&=23160; =7C&=23160; =7C ... =7C&=23160;&=23160;&=23160;&=231= 60;&=23160;&=23160;&=23160;&=23160;&=23160;&=23160;&=23160; =7C=

&=23160;&=23160;&=23160;&=23160; +---+&=23160;&=23160;&=23160;&=23160= ;&=23160;&=23160;&=23160;&=23160;&=23160;&=23160;&=23160;&=23160; +---+

&=23160;&=23160;&=23160;&=23160; =7C C =7C&=23160;&=23160;&=23160;&=23= 160;&=23160;&=23160;&=23160;&=23160;&=23160;&=23160;&=23160;&=23160; =7C = E =7C

&=23160;&=23160;&=23160;&=23160; +---+&=23160;&=23160;&=23160;&=23160= ;&=23160;&=23160;&=23160;&=23160;&=23160;&=23160;&=23160;&=23160; +---+

&=23160;&=23160;&=23160;&=23160;&=23160;&=23160; =7C&=23160;&=23160;&= =23160;&=23160;&=23160;&=23160;&=23160;&=23160;&=23160;&=23160;&=23160;&=23= 160;&=23160;&=23160;&=23160; &=23160;=7C 1000

&=23160;&=23160;&=23160;&=23160; +---+&=23160;&=23160;&=23160;&=23160= ;&=23160;&=23160;&=23160;&=23160;&=23160;&=23160;&=23160;&=23160; +---+

&=23160;&=23160;&=23160;&=23160; =7C B =7C-------------=7C D =7C

&=23160;&=23160;&=23160;&=23160; +---+ &=23160;&=23160;1000&=23160;&=23= 160;&=23160; &=23160;&=23160;+---+

&=23160;&=23160;&=23160;&=23160;&=23160;&=23160; =7C&=23160;&=23160;&= =23160;&=23160;&=23160;&=23160;&=23160;&=23160;&=23160;&=23160;&=23160;&=23= 160;&=23160;&=23160;&=23160;&=23160; =7C

&=23160;&=23160;&=23160;&=23160;&=23160;&=23160; =7C&=23160;&=23160;&= =23160;&=23160;&=23160;&=23160;&=23160;&=23160;&=23160;&=23160;&=23160;&=23= 160;&=23160;&=23160;&=23160;&=23160; =7C

&=23160;&=23160;&=23160;&=23160;&=23160;&=23160;&=23160; =5C&=23160;&= =23160;&=23160;&=23160;&=23160;&=23160;&=23160;&=23160;&=23160;&=23160;&=23= 160;&=23160;&=23160;&=23160; /

&=23160;&=23160;&=23160;&=23160;&=23160;&=23160;&=23160;&=23160; =5C&= =23160;&=23160;&=23160;&=23160;&=23160;&=23160;&=23160;&=23160;&=23160;&=23= 160;&=23160; /

&=23160;&=23160;&=23160;&=23160;&=23160;&=23160;&=23160;&=23160;&=231= 60; =5C&=23160;&=23160;&=23160;&=23160;&=23160;&=23160;&=23160;&=23160; /=

&=23160;&=23160;&=23160;&=23160;&=23160;&=23160;&=23160;&=23160;&=231= 60;&=23160; =5C&=23160;&=23160;&=23160;&=23160;&=23160; /

&=23160;&=23160;&=23160;&=23160;&=23160;&=23160;&=23160;&=23160;&=231= 60;&=23160;&=23160;&=23160; +---+

&=23160;&=23160;&=23160;&=23160;&=23160;&=23160;&=23160;&=23160;&=231= 60;&=23160;&=23160;&=23160; =7C A =7C

&=23160;&=23160;&=23160;&=23160;&=23160;&=23160;&=23160;&=23160;&=231= 60;&=23160;&=23160;&=23160; +---+

&=23160;

There is a topology northbound of C and E (not shown) and a topology s= outhbound of A (not shown).

Cost on all links is 10 except B-D and D-E where cost is high.<= u>

&=23160;

C is a node with 1000 neighbors.

When all links are up, shortest path for all northbound destinations i= s via C.

All nodes in the network support fast flooding except for Node D.

Let=E2=80=99s say fast flooding is 500 LSPs/second and slow flooding (= Node D) is 20 LSPs/seconds.

If &=23160;Node C fails we have 1000 LSPs to flood.

All nodes except for D can receive these in 2 seconds (plus internode = delay time).

D can receive LSPs in 50 seconds.

&=23160;

When A and B and all southbound nodes receive/process the LSP updates = they will start sending traffic to Northbound destinations via D.<= u>

But for the better part of 50 seconds, Node D has yet to receive all L= SP updates and still believes that shortest path is via B-C. It will loop= traffic.

&=23160;

Had all nodes used slow flooding, it still would have taken 50 seconds= to converge, but there would be significantly less looping. There could = be a good amount of blackholing, but this is preferable to looping.

&=23160;

One can always come up with examples =E2=80=93 based on a specific top= ology and a specific failure - where things might be better/worse/unchang= ed in the face of inconsistent flooding speed support.

But I hope this simple example illustrates the pitfalls.=

&=23160;

&=23160;&=23160;&=23160; Les

&=23160;

> -----Original Message-----

> =46rom: bruno.decraene=40orange.com <bruno.decraene=40= orange.com>

> Sent: Tuesday, May 05, 2020 8:28 AM

> To: Les Ginsberg (ginsberg) <ginsberg=40cisco.com>; lsr=40ietf.org

> Subject: =46looding across a network

>

> Les,

>

> > =46rom: Lsr =5Bmailto:lsr-bounces=40ietf.org=5D On Behalf Of Les Gi= nsberg

> (ginsberg)

> > Sent: Monday, May 4, 2020 4:39 PM

> =5B...=5D

> > when only some nodes in the network support faster flooding = the behavior

> of the whole network may not be =22better=22 when faster flooding= is enabled

> because it prolongs the period of LSDB inconsistency.

>

> 1) Do you have data on this=3F

>

> 2) If not, can you provide an example where increasing the floodi= ng rate on

> one adjacency prolongs the period of LSDB inconsistency across th= e

> network=3F

>

> 3) In the meantime, let's try the theoretical analysis on a simpl= e scenario

> where a single LSP needs to be flooded across the network.

>

> - Let's call Dij the time needed to flood the LSP from node i to = the adjacent

> node j. Clearly Dij>0.

> - Let's call k the node originating this LSP at t0=3D0s

>

> >=46rom t0, the LSDB is inconsistent across the network as all= nodes but k are

> missing the LSP and hence only know about the 'old' topology.

=

>

> Let's call&=23160; SPT(k) the SPT rooted on k, using Dij as the m= etric between

> adjacent nodes i and j. Let's call SP(k,i) the shortest path from= k to i; and

> D(k,i) the shortest distance between k and i..

>

> It seems that the time needed:

> - for node j to learn about the LSP, and get in sync with k, is D= (k,j)

> - for all nodes across the network to learn about the LSP, and ge= t in sync with

> k, is Max=5Bfor all j=5D D(k,j)

>

> Then how can reducing the flooding delay on one adjacency could p= rolongs

> the period of LSDB inconsistency=3F

> It seems to me that it can only improve/decrease it. Otherwise, t= his would

> mean that decreasing the cost on a link can increase the cost of = the shortest

> path.

>

> Note: I agree that there are other cases, such as&=23160; multipl= e LSPs originated by

> the same node, and multiple LSPs originated by multiple nodes, bu= t let's start

> with the simple case.

>

> Thanks,

> --Bruno

>

> > -----Original Message-----

> > =46rom: Lsr =5Bmailto:lsr-bounces=40ietf.org=5D On Behalf Of Les Gi= nsberg

> (ginsberg)

> > Sent: Monday, May 4, 2020 4:39 PM

> >

> > Henk -

> >

> > Thanx for your thoughtful posts.

> > I have read your later posts on this thread as well - but de= cided to reply to

> this one.

> > Top posting for better readability.

> >

> > There is broad agreement that faster flooding is desirable.<= /p>

> > There are now two proposals as to how to address the issue -= neither of

> which is proposing to use TCP (or equivalent).

> >

> > I have commented on why IS-IS flooding requirements are sign= ificantly

> different than that for which TCP is used.

> > I think it is also useful to note that even the simple test = case which Bruno

> reported on in last week's interim meeting demonstrated that with= out any

> changes to the protocol at all IS-IS was able to flood an order o= f magnitude

> faster than it commonly does today.

> > This gives me hope that we are looking at the problem correc= tly and will not

> need =22TCP=22.

> >

> > Introducing a TCP based solution requires:

> >

> > a)A major change to the adjacency formation logic

> >

> > b)Removal of the independence of the IS-IS protocol from the= address

> families whose reachability advertisements it supports - somethin= g which I

> think is a great strength of the protocol - particularly in envir= onments where

> multiple address family support is needed

> >

> > I really don't want to do either of the above.

> >

> > Your comments regarding PSNP response times are quite correc= t - and

> both of the draft proposals discuss this - though I agree more de= tail will be

> required.

> > It is intuitive that if you want to flood faster you also ne= ed to ACK faster -

> and probably even retransmit faster when that is needed.

> > The basic relationship between retransmit interval and PSNP = interval is

> expressed in ISO 10589:

> >

> > =22 partialSNPInterval - This is the amount of time between = periodic

> &=23160;&=23160;&=23160;&=23160;&=23160;&=23160;&=23160;&=23160;&= gt; action for transmission of Partial Sequence Number PDUs.

> &=23160;&=23160;&=23160;&=23160;&=23160;&=23160;&=23160;&=23160;&= gt; It shall be less than minimumLSPTransmission-Interval.=22

> >

> > Of course ISO 10589 recommended values (2 seconds and 5 seco= nds

> respectively) associated with a much slower flooding rate and

=

> implementations I am aware of use values in this order of magnitu= de.. These

> numbers need to be reduced if we are to flood faster, but the rel= ationship

> between the two needs to remain the same.

> >

> > It is also true - as you state - that sending ACKs more quic= kly will result in

> additional PDUs which need to be received/processed by IS-IS - an= d this has

> some impact. But I think it is reasonable to expect that an imple= mentation

> which can support sending and receiving LSPs at a faster rate sho= uld also be

> able to send/receive PSNPs at a faster rate. But we still need to= be smarter

> than sending one PSNP/one LSP in cases where we have a burst.

=

> >

> > LANs are a more difficult problem than P2P - and thus far dr= aft-ginsberg-lsr-

> isis-flooding-scale has been silent on this - but not because we = aren't aware

> of this - just have focused on the P2P behavior first.

> > What the best behavior on a LAN may be is something I am sti= ll considering.

> Slowing flooding down to the speed at which the slowest IS on the= LAN can

> support may not be the best strategy - as it also slows down the = propagation

> rate for systems downstream from the nodes on the LAN which can h= andle

> faster flooding - thereby having an impact on flooding speed thro= ughout the

> network in a way which may be out of proportion. This is a smalle= r example

> of the larger issue that when only some nodes in the network supp= ort faster

> flooding the behavior of the whole network may not be =22better=22= when faster

> flooding is enabled because it prolongs the period of LSDB incons= istency.

> More work needs to be done here...

> >

> > In summary, I don't expect to have to =22reinvent TCP=22 - b= ut I do think you

> have provided a useful perspective for us to consider as we progr= ess on this

> topic,

> >

> > Thanx.

> >

> &=23160;&=23160;&=23160;&=23160;> Les

> >

> >

> > > -----Original Message-----

> > > =46rom: Lsr <lsr-bounces=40ietf.org> On Behalf Of Henk S= mit

> > > Sent: Thursday, April 30, 2020 6:58 AM

> > > To: lsr=40= ietf.org

> > > Subject: =5BLsr=5D Why only a congestion-avoidance algo= rithm on the sender

> isn't

> > > enough

> > >

> > >

> > > Hello all,

> > >

> > > Two years ago, Gunter Van de Velde and myself published= this draft:

> > > https://tools.ietf.org/html/draft= -hsmit-lsr-isis-flooding-over-tcp-00

> > > That started this discussion about flow/congestion cont= rol and ISIS

> > > flooding.

> > >

> > > My thoughts were that once we start implementing new al= gorithms to

> > > optimize ISIS flooding speed, we'll end up with our own= version of TCP.

> > > I think most people here have a good general understand= ing of TCP.

> > > But if not, this is a good overview how TCP does it:

> > > https://en.wikipedia.org/wiki/TCP=5Fcongestion= =5Fcontrol

> > >

> > >

> > > What does TCP do:

> > > =3D=3D=3D=3D

> > > TCP does 2 things: flow control and congestion control.=

> > >

> > > 1) =46low control is: the receiver trying to prevent it= self from being

> > > overloaded. The receiver indicates, through the receive= r-window-size

> > > in the TCP acks, how much data it can or wants to recei= ve..

> > > 2) Congestion control is: the sender trying to prevent = the links between

> > > sender and receiver from being overloaded. The sender m= akes an

> educated

> > > guess at what speed it can send.

> > >

> > >

> > > The part we seem to be missing:

> > > =3D=3D=3D=3D

> > > =46or the sender to make a guess at what speed it can s= end, it looks at

> > > how the transmission is behaving. Are there drops =3F W= hat is the RTT =3F

> > > Do drop-percentage and RTT change =3F Do acks come in a= t the same rate

> > > as the sender sends segments =3F Are there duplicate ac= ks =3F To be able

> > > to do this, the sender must know what to expect. How ac= ks behave.

> > >

> > > If you want an ISIS sender to make a guess at what spee= d it can send,

> > > without changing the protocol, the only thing the sende= r can do is look

> > > at the PSNPs that come back from the receiver. But the = RTT of PSNPs can

> > > not be predicted. Because a good ISIS implementation do= es not

> > > immediately

> > > send a PSNP when it receives a LSP.. 1) the receiver sh= ould jitter the

> > > PSNP,

> > > like it should jitter all packets. And 2) the receiver = should wait a

> > > little

> > > to see if it can combine multiple acks into a single PS= NP packet.

> > >

> > > In TCP, if a single segment gets lost, each new segment= will cause the

> > > receiver to send an ack with the seqnr of the last rece= ived byte. This

> > > is called =22duplicate acks=22. This triggers the sende= r to do

> > > fast-retransmission. In ISIS, this can't be be done. Th= e information

> > > a sender can get from looking at incoming PSNPs is a lo= t less than what

> > > TCP can learn from incoming acks.

> > >

> > >

> > > The problem with sender-side congestion control:

> > > =3D=3D=3D=3D

> > > In ISIS, all we know is that the default retransmit-int= erval is 5

> > > seconds.

> > > And I think most implementations use that as the defaul= t. This means

> > > that

> > > the receiver of an LSP has one requirement: send a PSNP= within 5

> > > seconds.

> > > =46or the rest, implementations are free to send PSNPs = however and

> > > whenever

> > > they want. This means a sender can not really make conc= lusions about

> > > flooding speed, dropped LSPs, capacity of the receiver,= etc.

> > > There is no ordering when flooding LSPs, or sending PSN= Ps.. This makes

> > > a sender-side algorithm for ISIS a lot harder.

> > >

> > > When you think about it, you realize that a sender shou= ld wait the

> > > full 5 seconds before it can make any real conclusions = about dropped

> > > LSPs.

> > > If a sender looks at PSNPs to determine its flooding sp= eed, it will

> > > probably

> > > not be able to react without a delay of a few seconds. = A sender might

> > > send

> > > hunderds or thousands of LSPs in those 5 seconds, which= might all or

> > > partially be dropped, complicating matters even further= .

> > >

> > >

> > > A sender-sider algorithm should specify how to do PSNPs= .

> > > =3D=3D=3D=3D

> > > So imho a sender-side only algorithm can't work just li= ke that in a

> > > multi-vendor environment. We must not only specify a co= ngestion-

> control

> > > algorithm for the sender. We must also specify for the = receiver a more

> > > specific algorithm how and when to send PSNPs. At least= how to do

> PSNPs

> > > under load.

> > >

> > > Note that this might result in the receiver sending mor= e (and smaller)

> > > PSNPs.

> > > More packets might mean more congestion (inside routers= ).

> > >

> > >

> > > Will receiver-side flow-control work =3F

> > > =3D=3D=3D=3D

> > > I don't know if that's enough. It will certainly help.<= /p>

> > >

> > > I think to tackle this problem, we need 3 parts:

> > > 1) sender-side congestion-control algorithm

> > > 2) more detailed algorithm on receiver when and how to = send PSNPs

> > > 3) receiver-side flow-control mechanism

> > >

> > > As discussed at length, I don't know if the ISIS proces= s on the

> > > receiving

> > > router can actually know if its running out of resource= s (buffers on

> > > interfaces, linecards, etc). That's implementation depe= ndent. A receiver

> > > can definitely advertise a fixed value. So the sender h= as an upper bound

> > > to use when doing congestion-control. Just like TCP has= both a

> > > flow-control

> > > window and a congestion-control window, and a sender us= es both.

> Maybe

> > > the

> > > receiver can even advertise a dynamic value. Maybe now,= maybe only in

> > > the

> > > future. An advertised upper limit seems useful to me to= day.

> > >

> > >

> > > What I didn't like about our own proposal (flooding ove= r TCP):

> > > =3D=3D=3D=3D

> > > The problem I saw with flooding over TCP concerns multi= -point networks

> > > (LANs).

> > >

> > > When flooding over a multi-point network, setting up TC= P connections

> > > introduces serious challenges. Who are the endpoints of= the TCP

> > > connections =3F

> > > =46ull mesh =3F Or do all ISes on a LAN create a TCP-co= nnection to the DIS =3F

> > > There is no backup DIS in ISIS (unlike OSP=46). Things = get messy quickly.

> > >

> > > However, the other two proposals do not solve this prob= lem either.

> > > How will a sender-side congestion-avoidence algorithm d= etermine

> whether

> > > there were drops =3F There are no acks (PSNPs) on a LAN= . We assume most

> > > LSPs

> > > that are broadcasted are received by all other ISes on = the LAN. There

> > > are

> > > no acks. Only after the DIS has sent its periodic CSNPs= , ISes can send

> > > PSNPs to request retransmissions. It seems impossible (= or very hard) to

> > > me for all ISes on a LAN to keep track of dropped LSPs = and adjust their

> > > sending speed accordingly.

> > >

> > > When flooding on a LAN, the receiver-side algorithm see= ms best.

> Because

> > > all ISes can see what the lowest advertised sending-spe= ed is. And make

> > > sure they send slow enough to not overload the slowest = IS.. I'm not sure

> > > this is a good solution, but is seems easier and more r= ealistic than

> > > ISIS-flooding-over-TCP or sender-side congestion-avoida= nce.

> > >

> > >

> > > My conclusion:

> > > =3D=3D=3D=3D

> > > Sender-side congestion-control won't work without speci= fying in more

> > > detail how and when to send PSNPs.

> > > Receiver-side flow-control will certainly help. I dont'= know if it's

> > > good enough. I don't know if advertising a static value= is good enough.

> > > But it's a start.

> > >

> > > I still think we'll end up re-implementing a new (and w= eaker) TCP.

> > >

> > >

> > > henk.

> > >

> > > =5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F= =5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F= =5F=5F=5F

> > > Lsr mailing list

> > > Lsr=40ie= tf.org

> > > https://www.ietf.org/mailman/listinfo/lsr

> >

> > =5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F= =5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F= =5F=5F

> > Lsr mailing list

> > Lsr=40ietf.org=

> > https://www.ietf.org/mailman/listinfo/lsr

>

> =5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F= =5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F= =5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F

> =5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F= =5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F= =5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F

> =5F=5F=5F=5F=5F

>

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--5eb39187_3f07acc3_2480-- From nobody Thu May 7 00:22:27 2020 Return-Path: X-Original-To: lsr@ietf.org Delivered-To: lsr@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id 58C483A07AA; Thu, 7 May 2020 00:22:03 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: internet-drafts@ietf.org To: Cc: lsr@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 6.129.1 Auto-Submitted: auto-generated Precedence: bulk Reply-To: lsr@ietf.org Message-ID: <158883612327.28118.2763200685949181054@ietfa.amsl.com> Date: Thu, 07 May 2020 00:22:03 -0700 Archived-At: Subject: [Lsr] I-D Action: draft-ietf-ospf-te-link-attr-reuse-11.txt X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 07 May 2020 07:22:04 -0000 A New Internet-Draft is available from the on-line Internet-Drafts directories. This draft is a work item of the Link State Routing WG of the IETF. Title : OSPF Link Traffic Engineering Attribute Reuse Authors : Peter Psenak Les Ginsberg Wim Henderickx Jeff Tantsura John Drake Filename : draft-ietf-ospf-te-link-attr-reuse-11.txt Pages : 21 Date : 2020-05-07 Abstract: Existing traffic engineering related link attribute advertisements have been defined and are used in RSVP-TE deployments. Since the original RSVP-TE use case was defined, additional applications (e.g., Segment Routing Traffic Engineering, Loop Free Alternate) have been defined which also make use of the link attribute advertisements. In cases where multiple applications wish to make use of these link attributes the current advertisements do not support application specific values for a given attribute nor do they support indication of which applications are using the advertised value for a given link. This document introduces new link attribute advertisements in OSPFv2 and OSPFv3 which address both of these shortcomings. The IETF datatracker status page for this draft is: https://datatracker.ietf.org/doc/draft-ietf-ospf-te-link-attr-reuse/ There are also htmlized versions available at: https://tools.ietf.org/html/draft-ietf-ospf-te-link-attr-reuse-11 https://datatracker.ietf.org/doc/html/draft-ietf-ospf-te-link-attr-reuse-11 A diff from the previous version is available at: https://www.ietf.org/rfcdiff?url2=draft-ietf-ospf-te-link-attr-reuse-11 Please note that it may take a couple of minutes from the time of submission until the htmlized version and diff are available at tools.ietf.org. Internet-Drafts are also available by anonymous FTP at: ftp://ftp.ietf.org/internet-drafts/ From nobody Thu May 7 00:24:48 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 973D43A07AA; Thu, 7 May 2020 00:24:45 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -9.601 X-Spam-Level: X-Spam-Status: No, score=-9.601 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIMWL_WL_MED=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, SPF_PASS=-0.001, URIBL_BLOCKED=0.001, USER_IN_DEF_DKIM_WL=-7.5] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=cisco.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 8NwNpc-E-o5X; Thu, 7 May 2020 00:24:32 -0700 (PDT) Received: from aer-iport-2.cisco.com (aer-iport-2.cisco.com [173.38.203.52]) (using TLSv1.2 with cipher DHE-RSA-SEED-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 1F4123A09AF; Thu, 7 May 2020 00:24:11 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=44795; q=dns/txt; s=iport; t=1588836252; x=1590045852; h=subject:from:to:cc:references:message-id:date: mime-version:in-reply-to:content-transfer-encoding; bh=YR75y7KcTkS9p46L68IH1xIqyVYXFH/kZbsnq4B8LsY=; b=lPrt8641Dtfkbhkc/mfNu5tIcZpj6BYKVCrsksFYQ9TE4BXSOy00fEyo Wg1fjM8sWrju6+fLeeZB+1vgUYqJ2iyt3zZS8+05KXvN/1RLARsejyfA9 UocZPji9rrOekzuNwS74yAEoYjuCENdshYHEkGuDoIHyjQ260VmbqjTcq Y=; X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: =?us-ascii?q?A0DMAwA3t7Ne/xbLJq1cChwBAQEBAQE?= =?us-ascii?q?HAQESAQEEBAEBQIFHgxhVIBKETYkBh2ItmXeBZwsBAQEOJQoEAQGERAKCKDg?= =?us-ascii?q?TAgMBAQsBAQUBAQECAQUEbYUqBiYMhXEBAQEBAgEaAQgPAQU2BAcFCwsOCgI?= =?us-ascii?q?CJgICVwYBDAgBAReDCwGCXCAPA682doEyhDkBhGqBOgaBDiqJeIJmgUE/gRA?= =?us-ascii?q?BJ4JpPoJnAQEDgSgNBA+DLIJgBI4bERgqkzKPNH2CUoJwhSiBCoQjTol9Bh2?= =?us-ascii?q?CW4hhBYRPgnGKH5AXiVSTcIFpIoFWMxoIGxU7gjUBNE8YDYoShjkDF4hjhUQ?= =?us-ascii?q?/A2cCBgEHAQEDCZABAiYHghYBAQ?= X-IronPort-AV: E=Sophos;i="5.73,362,1583193600"; d="scan'208";a="25965285" Received: from aer-iport-nat.cisco.com (HELO aer-core-4.cisco.com) ([173.38.203.22]) by aer-iport-2.cisco.com with ESMTP/TLS/DHE-RSA-SEED-SHA; 07 May 2020 07:24:09 +0000 Received: from [10.60.140.51] (ams-ppsenak-nitro2.cisco.com [10.60.140.51]) by aer-core-4.cisco.com (8.15.2/8.15.2) with ESMTP id 0477O8dr027878; Thu, 7 May 2020 07:24:08 GMT From: Peter Psenak To: Alvaro Retana , "draft-ietf-ospf-te-link-attr-reuse@ietf.org" Cc: Yingzhen Qu , "lsr-chairs@ietf.org" , "lsr@ietf.org" References: <6e1f3647-5c1f-4c31-27b7-82fe576d2c96@cisco.com> Message-ID: Date: Thu, 7 May 2020 09:24:08 +0200 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:60.0) Gecko/20100101 Thunderbird/60.7.0 MIME-Version: 1.0 In-Reply-To: <6e1f3647-5c1f-4c31-27b7-82fe576d2c96@cisco.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit X-Outbound-SMTP-Client: 10.60.140.51, ams-ppsenak-nitro2.cisco.com X-Outbound-Node: aer-core-4.cisco.com Archived-At: Subject: Re: [Lsr] AD Review of draft-ietf-ospf-te-link-attr-reuse-10 X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 07 May 2020 07:24:46 -0000 Hi Alvaro, the new version which addresses your comments have been posted. thanks, Peter On 05/05/2020 12:08, Peter Psenak wrote: > Hi Alvaro, > > thanks for your comments. > > > I apologize for the delay in responding to your comments. > > I tried to address all of them, some have been resolved during ISIS > draft review, in which case I took the same resolution for this draf. > > Please see inline, look for ##PP > > Dear Authors: > > Happy New Year! > > I have finished reading this document, reviewing the e-mail archive > and all the various reviews and comments. Quoting one of the authors, > "it is essential that the two IGPs provide equivalent functionality" > [1] -- so I have considered draft-ietf-isis-te-app-09 in parallel with > this one (I'm sending out a separate yet very similar review for it). > > In general, I think both drafts need some work. When appropriate, I > have used "[c]" to highlight comparisons. I tried to put equivalent > comments in both documents, but may have missed a few... > > I have some significant concerns (see details inline) about this > document -- and as a result about the ISIS draft. I want to point out > a couple of them here: > > (A) Deployment Considerations > > This document contains what I would characterize as a "distributed" > Deployment Considerations section through §8, §9 and §10. There is a > lot of content, but I still made some comments inline about other > important information. Please consider consolidating all the > deployment-related information in one place. rfc5706 (specially §2) > may be useful, please take a look. > > > ##PP > I have kept "Attribute Advertisements and Enablement" section (moved it > up) and combined "Deployment Considerations" and "Interoperability, > Backwards Compatibility and Migration" into single section "Deployment > Considerations" similar to what has been done for ISIS > > > > > [c] This document does not include equivalent information to what is > in §7.* in the ISIS draft. Please consider "importing" it (or at > least making a reference). > > > ##PP > done > > > (B) I was able to identify one significant functional difference which > warrants a discussion of the reason for it and maybe the pros/cons: > > §3 talks about the behavior when "both SABM Length and UDABM Length > are 0". > This document makes the use of the attributes mandatory by all > applications > (in conflict with §8.2) while the ISIS draft makes their use > optional (§4.1). > > > ##PP > removed the text in section 3 and clarified in section "Use of Zero > Length Application Identifier Bit Masks" to match what is in ISIS draft. > > > I will wait for this review to be addressed before moving both > documents forward together. > > Thanks! > > Alvaro. > > [1] https://mailarchive.ietf.org/arch/msg/ospf/7zkoaLfUe19JxTOWaKWO51wK9gg > > > [Line numbers from idnits.] > > ... > 16 Abstract > > 18 Various link attributes have been defined in OSPF in the context of > 19 the MPLS Traffic Engineering (TE) and GMPLS. Since the original > 20 RSVP-TE use case was defined, additional applications (e.g., SRTE, > 21 LFA) have been defined which also make use of the link attribute > 22 advertisements. This document defines how to distribute link > 23 attributes in OSPFv2 and OSPFv3 for applications other than MPLS TE > 24 or GMPLS. > > [c] This abstract is a lot more general, while the ISIS one provides > more specifics, including talking about RSVP-TE instead of MPLS TE... > > [minor] It may not be obvious to all readers what the relationship is > between RSVP-TE and MPLS TE... > > ##PP > Made it similar to ISIS draft. > > > > ... > 89 1. Introduction > > 91 Various link attributes have been defined in OSPFv2 [RFC2328] and > 92 OSPFv3 [RFC5340] in the context of the MPLS TE and GMPLS. All these > 93 attributes are distributed by OSPFv2 as sub-TLVs of the Link-TLV > 94 advertised in the OSPFv2 TE Opaque LSA [RFC3630]. In OSPFv3, they > 95 are distributed as sub-TLVs of the Link-TLV advertised in the OSPFv3 > 96 Intra-Area-TE-LSA as defined in [RFC5329]. > > [nit] s/defined in OSPFv2/defined for OSPFv2 > > [nit] s/context of the MPLS/context of MPLS > > [minor] "All these attributes..." Which attributes? I'm sure the > references are made later, but since they are mentioned here first, > please put references here. [[c] The ISIS draft mentions the relevant > RFCs from the start.] > > 98 Many of these link attributes are useful outside of traditional MPLS > 99 Traffic Engineering or GMPLS. This brings its own set of problems, > 100 in particular how to distribute these link attributes in OSPFv2 and > 101 OSPFv3 when MPLS TE and GMPLS are not deployed or are deployed in > 102 parallel with other applications that use these link attributes. > > [nit] "own set of problems" Are there others you want to highlight > besides the distribution? > > [minor] What is an application? I think I can tell the difference > between an "application", as used in this document, and an > "application" as what the ART area does: "The ART area develops > application protocols and architectures in the IETF." [1] Please > define what an application is in the context of this document. > > [1] https://datatracker.ietf.org/group/art/about/ > > [major] Related to applications... "distinction between link > attributes used by TE and link attributes used by other OSPFv2 or > OSPFv3 applications" [§2.1] Some of the other applications mentioned > (SRTE, for example) are also related to Traffic Engineering, so the > general use of TE and non-TE as a distinction is very confusing and > seems to assume the type of applications that can use the alternate > advertisement are limited to "non-TE" -- but I'm sure that is not the > objective. Please be clear in the use of general terms like TE. > > [c] The ISIS draft seems to be more careful/explicit when pointing out > the difference. > > [nit] s/distribute these link attributes...with other applications > that use these link attributes./distribute these link > attributes...with other applications that may use them. > > > ##PP > Changed to match the ISIS draft, > > > ... > 124 1.1. Requirements notation > > 126 The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", > 127 "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this > 128 document are to be interpreted as described in [RFC2119]. > > [major] Use the rfc8174 template. > > ##PP > done > > > [c] Before starting with the solution, the ISIS draft has a section > ("Legacy Advertisements") that talks about the current state. I > thought that was very helpful. An equivalent section in this case > would review (or at least point to) RFC3630, RFC5329, RFC7471, > RFC7684, RFC8362... > > > ##PP > done. Moved some of the content from section 2.1 to this new section. > > > ... > 136 2.1. OSPFv2 Extended Link Opaque LSA and OSPFv3 E-Router-LSA > > 138 Extended Link Opaque LSAs as defined in [RFC7684] for OSPFv2 and > 139 Extended Router-LSAs [RFC8362] for OSPFv3 are used to advertise link > 140 attributes that are used by applications other then MPLS TE or GMPLS. > 141 These LSAs were defined as a generic containers for distribution of > 142 the extended link attributes. There are several advantages in using > 143 them: > > 145 1. Advertisement of the link attributes does not make the link part > 146 of the TE topology. It avoids any conflicts and is fully > 147 compatible with [RFC3630] and [RFC5329]. > > 149 2. The OSPFv2 TE Opaque LSA and OSPFv3 Intra-Area-TE-LSA remains > 150 truly opaque to OSPFv2 and OSPFv3 as originally defined in > 151 [RFC3630] and [RFC5329] respectively. Their contents are not > 152 inspected by OSPF, that acts as a pure transport. > > 154 3. There is clear distinction between link attributes used by TE and > 155 link attributes used by other OSPFv2 or OSPFv3 applications. > > > [major] "used by TE" is ambiguous because SRTE, for example, is a form > of TE. Note that the TE term is used extensively throughout the > document...and it may cause that same type of confusion. The same > applies for the mention of "non-TE" later on... Please be explicit > and don't simply use TE/non-TE, but as necessary qualify the use. > > > ##PP > fixed > > 157 4. All link attributes that are used by other applications are > 158 advertised in a single LSA, the Extended Link Opaque LSA in > 159 OSPFv2 or the OSPFv3 E-Router-LSA [RFC8362] in OSPFv3. > > 161 The disadvantage of this approach is that in rare cases, the same > 162 link attribute is advertised in both the TE Opaque and Extended Link > 163 Attribute LSAs in OSPFv2 or the Intra-Area-TE-LSA and E-Router-LSA in > 164 OSPFv3. Additionally, there will be additional standardization > 165 effort. However, this could also be viewed as an advantage as the > 166 non-TE use cases for the TE link attributes are documented and > 167 validated by the LSR working group. > > [minor] "...both the TE Opaque and Extended Link Attribute LSAs in > OSPFv2 or the Intra-Area-TE-LSA and E-Router-LSA in OSPFv3." It might > be good to introduce (maybe in the §2 introduction) how the > information is advertised today so that this makes sense to the casual > reader. > > ##PP > done > > > [nit] "Additionally, there will be additional standardization effort." > Not really a technical argument... Hopefully when attributes are > standardized in one case they will at the same time standardized for > using the alternate advertisement mechanism. > > ##PP > removed > > [major] "non-TE use cases" Same comment as above: SRTE is a form of > TE. Please either be specific and use MPLS TE/RSVP-TE, or clearly > define the terms somewhere so that readers understand that non-TE > still includes TE mechanisms like SRTE... > > ##PP > done > > [nit] The last sentence is unnecessary.. The registration policy for > the registries is set at "IETF Review or IESG Approval", which means > that any RFC from any WG would be ok to register a new value (IETF > Review), and that there may even exist cases when an RFC is not needed > (IESG Approval)...and there are also ranges for Experimental Use and > FCFS. IOW, there is no guarantee that new attributes, or even the > rehashing of existing ones for "non-TE use cases" will even go through > the IETF, much less the lsr WG. > > > ##PP > removed > > > > > > 169 Extended Link Opaque LSA [RFC7684] and E-Router-LSA [RFC8362] are > 170 used to advertise any link attributes used for non-TE applications in > 171 OSPFv2 or OSPFv3 respectively, including those that have been > 172 originally defined for TE applications. > > [minor] Please include a forward reference to §4 somewhere. > > ##PP > done > > [nit] This is the 3rd time that you mention this... > > ##PP > It is important :) > > > > 174 TE link attributes used for RSVP-TE/GMPLS continue to use OSPFv2 TE > 175 Opaque LSA [RFC3630] and OSPFv3 Intra-Area-TE-LSA [RFC5329]. > > [nit] Also mentioned above... > > ##PP > We need to make this very clear. I rather keep it in multiple places > > > > > 177 The format of the link attribute TLVs that have been defined for TE > 178 applications will be kept unchanged even when they are used for non- > 179 TE applications. Unique code points will be allocated for these TE > 180 link attribute TLVs from the OSPFv2 Extended Link TLV Sub-TLV > 181 Registry [RFC7684] and from the OSPFv3 Extended LSA Sub-TLV Registry > 182 [RFC8362]. For each reused TLV, the code point will be defined in an > 183 IETF document along with the expected use-case(s). > > > [minor] s/Unique code points will be allocated.../Unique code points > are allocated... > Please also add a pointer to the IANA Considerations section here. > > ##PP > done > > > [major] "For each reused TLV, the code point will be defined in an > IETF document along with the expected use-case(s)." It sounds as if > the intent of this sentence is to set a requirement for future work. > However, as I mentioned above, the Registration Policy defined for the > registries don't support asking for any type of IETF documentation. > > ##PP > removed > > > > 185 3. Advertisement of Application Specific Values > > 187 To allow advertisement of the application specific values of the link > 188 attribute, a new Application Specific Link Attributes (ASLA) sub-TLV > 189 is defined. The ASLA sub-TLV is a sub-TLV of the OSPFv2 Extended > 190 Link TLV [RFC7471] and OSPFv3 Router-Link TLV [RFC8362]. > > [minor] s/RFC7471/RFC7684 > > ##PP > fixed > > > ... > 221 SABM Length: Standard Application Identifier Bit-Mask Length. It > 222 MUST be a multiple of 4 bytes. If the Standard Application Bit- > 223 Mask is not present, the Standard Application Bit-Mask Length MUST > 224 be set to 0. > > [c] The ISIS draft defines the L-flag to indicate that the > "applications listed...MUST use the legacy advertisements". There is > no equivalent functionality here. Please see my comments about this > in §4.1 (of the ISIS draft). > > ##PP > That is correct, there is no L-flag in OSPF. We do not plan to use TE > Opaque LSA for anything else than what they have been defined for. > > > > > > ... > 231 Standard Application Identifier Bit-Mask: Optional set of bits, > 232 where each bit represents a single standard application. Bits are > 233 defined in [I-D.ietf-isis-te-app], which also request a new IANA > 234 "Link Attribute Applications" registry under "Interior Gateway > 235 Protocol (IGP) Parameters" for them. The bits are repeated here > 236 for informational purpose: > > [minor] s/Bits are defined in [I-D.ietf-isis-te-app], which also > request a new IANA "Link Attribute Applications" registry under > "Interior Gateway Protocol (IGP) Parameters" for them./Bits are > defined in [I-D.ietf-isis-te-app]. > > ##PP > done > > 238 Bit-0 (R-bit): RSVP TE > > [nit] s/RSVP TE/RSVP-TE > > ##PP > done > > 240 Bit-1 (S-bit): Segment Routing TE > > 242 Bit-2 (F-bit): Loop Free Alternate (LFA). Includes all LFA > 243 types > > [just wondering] Given that we're trying to future-proof... Can there > be cases where the link attributes for "normal" LFA, vs Remote LFA > (for example) might need to be different? Considering that part of > the justification for this work is the need to potentially advertise > different attributes per application, and given that the question > "what is meant by LFA?" came up more than once on the mailing list, I > guess the answer might be yes (at least for some use cases). Knowing > that the user has their own bits to play with, I'm sure they can > accommodate if the need comes up. Just thinking out loud... > > > ##PP > has been closed with ISIS draft. > > > ... > 248 Standard Application Identifier Bits are defined/sent starting with > 249 Bit 0. Additional bit definitions that are defined in the future > 250 SHOULD be assigned in ascending bit order so as to minimize the > 251 number of octets that will need to be transmitted. > > [major] "Additional bit definitions that may be defined in the future > SHOULD be assigned in ascending bit order so as to minimize the number > of octets that will need to be transmitted." This statement about > assignment belongs in the IANA Consideration section as part of the > instructions to IANA on how to manage the space. > > [major] When would it be ok for IANA not to assign the values in > order? IOW, why is that a SHOULD and not a MUST? > > [minor] Given the intent to minimize the transmissions, should there > be a statement standardizing that behavior? I'm thinking of something > like: "In order to minimize the number of octets transmitted, the > sender SHOULD/MUST (?) transmit only the minimum necessary amount of > information..." IOW, the assignment policy, and the ability to > advertise the *ABM Length is useless unless the sender takes advantage > of it. > > > #PP > removed this text, as bits and the registry that defines them is > specified in ISIS draft. > > > 253 User Defined Application Identifier Bits have no relationship to > 254 Standard Application bits and are NOT managed by IANA or any other > 255 standards body. It is recommended that bits are used starting with > 256 Bit 0 so as to minimize the number of octets required to advertise > 257 all of them. > > [nit] "all of them", what? s/all of them/any User Defined Applications. > > ##PP > Changed to "all UDAs" > > > 259 Undefined bits in both Bit-Masks MUST be transmitted as 0 and MUST be > 260 ignored on receipt. Bits that are NOT transmitted MUST be treated as > 261 if they are set to 0 on receipt. > > [major] "Undefined bits MUST be transmitted as 0 and MUST be ignored > on receipt." What if the sender and the receiver support a different > set of applications? For example, suppose that the sender supports a > new application identified by the N-bit, and sets only that bit; the > receiver treats the N-bit as unknown (= undefined) and ignores it. > The result is that, for the receiver, there seems to be no indication > of an application. Is "no application" a valid indication, or should > at least one bit always be set? > > ##PP > Just like unknown TLVs, unknown bits MUST be ignored. > I have added more text, similar to ISIS. > > Note that below the case is presented for when "neither the Standard > Application Bits nor the User Defined Application bits are set (i.e., > both SABM Length and UDABM Length are 0)", but the condition is > different because the bits are not present (see my comment below). > > [minor] Following on the previous comment... It seems that a > requirement is for the routers/nodes in the domain to agree on the > meaning of the bits: support the same Standard Applications and > interpret the User Defined bit mask the same way. Please add this > type of information to the potential new Deployment Considerations > Section. > > ##PP > For Standard Applications it is obvious that we need to agree on the > meaning of the bits. That's why we are standardizing them. For User > Defined bits, I would rather avoid specifying anything, it's up to the > user what it does. > > [nit] "Bits that are NOT transmitted MUST be..." While I understand > what you mean, having Normative language for the behavior of things > that are not received doesn't seem appropriate. How about something > like this: "Any omitted bits MUST be..."? > > ##PP > aligned with ISIS draft. > > > ... > 271 The advantage of not making the Application Bit-Masks part of the > 272 attribute advertisement itself is that we can keep the format of the > 273 link attributes that have been defined previously and reuse the same > 274 format when advertising them in the ASLA sub-TLV. > > [nit] s/we can keep the format of the link attributes that have been > defined previously and reuse the same format when advertising them in > the ASLA sub-TLV./the format of any previously defined link attributes > can be kept and reused when advertising them in the ASLA sub-TLV. > > > ##PP > done > > > 276 When neither the Standard Application Bits nor the User Defined > 277 Application bits are set (i.e., both SABM Length and UDABM Length are > 278 0) in the ASLA sub-TLV, then the link attributes included in it MUST > 279 be considered as being applicable to all applications. > > [major] s/bits are set/bits are present > "set" gives the impression of them being "1"; it's different to have > them all be 0 than to have then not be there. > > [major] The specification of what to do when "both SABM Length and > UDABM Length are 0" is inconsistent with §8.2. Please specify the > behavior only once. > > > ##PP > I have removed this text and added the text to "Deployment consideration > " section. The text matches what is in the ISIS draft. > > [c] The ISIS draft leaves open the possibility for applications to use > the attributes while this document makes it mandatory. I think this is > a significant functional difference. > > ##PP > I have aligned with ISIS. > > > 281 If, however, another advertisement of the same link attribute > 282 includes any Application Bit-Mask in the ASLA sub-TLV, applications > 283 that are listed in the Application Bit-Masks of such ASLA sub-TLV > 284 SHOULD use the attribute advertisement which has the application > 285 specific bit set in the Application Bit-Masks. > > 287 If the same application is listed in the Application Bit-Masks of > 288 more then one ASLA sub-TLV, the application SHOULD use the first > 289 advertisement and ignore any subsequent advertisements of the same > 290 attribute. This situation SHOULD be logged as an error. > > [major] For the first two SHOULDs (in the last two paragraphs: "SHOULD > use the attribute advertisement" and "SHOULD use the first > advertisement"). When is it ok to not do as specified? For example, > are there specific considerations related to not selecting the first > advertisement? Why would a receiver not use the attribute > advertisement which has the application specific bit set? IOW, why > are these not MUSTs? > > ##PP > Changed to MUST. > > > > > > 292 This document defines the initial set of link attributes that MUST > 293 use ASLA sub-TLV if advertised in the OSPFv2 Extended Link TLV or in > 294 the OSPFv3 Router-Link TLV. If the ASLA sub-TLV includes any link > 295 attribute(s) NOT listed below, they MUST be ignored. Documents which > 296 define new link attributes MUST state whether the new attributes > 297 support application specific values and as such MUST be advertised in > 298 an ASLA sub-TLV. The link attributes that MUST be advertised in ASLA > 299 sub-TLVs are: > > [nit] s/use ASLA sub-TLV/use the ASLA sub-TLV > > ##PP > fixed > > > > [major] "initial set of link attributes that MUST use [the] ASLA > sub-TLV if advertised..." The second paragraph in this section says > that "ASLA sub-TLV is an optional sub-TLV" -- that is a true > statement. However, the ASLA sub-TLV is (according to this paragraph) > mandatory when the link attributes are used. > > Suggestion (for the second paragraph)> > > The ASLA sub-TLV is an optional sub-TLV and can appear multiple > times in the > OSPFv2 Extended Link TLV and OSPFv3 Router-Link TLV. It MUST be > present if > any of the link attributes listed at the end on this section are > advertised. It has the following format: > > > ##PP > done > > > 301 - Shared Risk Link Group > > 303 - Unidirectional Link Delay > > 305 - Min/Max Unidirectional Link Delay > > 307 - Unidirectional Delay Variation > > 309 - Unidirectional Link Loss > > 311 - Unidirectional Residual Bandwidth > > 313 - Unidirectional Available Bandwidth > > 315 - Unidirectional Utilized Bandwidth > > 317 - Administrative Group > > 319 - Extended Administrative Group > > 321 - TE Metric > > [minor] Please include references for the definition of these attributes. > > ##PP > done > > > 323 4. Reused TE link attributes > > 325 This section defines the use case and code points from the OSPFv2 > 326 Extended Link TLV Sub-TLV Registry and OSPFv3 Extended LSA Sub-TLV > 327 Registry for some of the link attributes that have been originally > 328 defined for TE or GMPLS. > > [minor] "defines the...code points" The code points are > assigned/defined by IANA later on.. Perhaps: "This section defines > the use cases and indicates the code points (see Section 12)..." > > ##PP > done > > > ... > 408 4.4. TE Metric > > 410 [RFC3630] defines TE Metric. > > [minor] rfc3630 calls it "Traffic Engineering Metric" > > ##PP > fixed > > > ... > 417 5. Maximum Link Bandwidth > > [nit] Include the application independent attributes in a single > section -- a sub-section each. > > 419 Maximum link bandwidth is an application independent attribute of the > 420 link that is defined in [RFC3630]. Because it is an application > 421 independent attribute, it MUST NOT be advertised in ASLA sub-TLV. > 422 Instead, it MAY be advertised as a sub-TLV of the Extended Link > 423 Opaque LSA Extended Link TLV in OSPFv2 [RFC7684] or sub-TLV of OSPFv3 > 424 E-Router-LSA Router-Link TLV in OSPFv3 [RFC8362]. > > [minor] I understand why the "Maximum link bandwidth is an application > independent attribute of the link". But I am having a harder time > understanding why other bandwidth-related metrics (specifically > Unidirectional Residual Bandwidth, Unidirectional Available Bandwidth > and Unidirectional Utilized Bandwidth) are not treated the same way. > A similar question was raised on the list and the treatment was > justified in order to support use cases where the bandwidth is managed > per application [1]. I don't want to revisit the discussion here > about the treatment, but it is important for the reader to understand > the existence of those use cases. Please add a paragraph or two > talking about the consideration. > > ##PP > added a similar section as the one that has been added to ISIS draft. > > > [1] https://mailarchive.ietf.org/arch/msg/ospf/xl8HWDeQqYNcv_X_568-xv6rfvk > > [minor] This attribute and other bandwidth-related ones are prone to > interaction as multiple applications may want to use the resources. > While the use of the resources is out of scope, it would be helpful to > include that type of information in a Deployment Considerations > section. > > [c] A related point was made when reviewing the ISIS draft [1]. > > [1] > https://mailarchive.ietf.org/arch/msg/isis-wg/2M2pho1EZcVTkOOQssLQUVO0HY4 > > > ##PP > I hope the added section makes it clear. > > > ... > [minor][c] The ISIS draft also calls out the Maximum Reservable Link > Bandwidth and Unreserved Bandwidth as attributes specific to > RSVP-TE...but this document doesn't [§4.2.2]. Why? I think the > answer has to do with this text from §2.1: > > TE link attributes used for RSVP-TE/GMPLS continue to use OSPFv2 TE > Opaque LSA [RFC3630] and OSPFv3 Intra-Area-TE-LSA [RFC5329]. > > Is that correct? > > ##PP > more precisely, Maximum Reservable Link Bandwidth and Unreserved > Bandwidth as RSVP-TE specific attributes are not allowed in ASLA TLV. > These attributes MUST use TE Opaque LSAs. > > If so, it wasn't completely clear to me that the sub-TLVs defined in > rfc3630 and rfc5329 continue to be advertised when using > RSVP-TE/GMPLS. > > ##PP > - all TLVs defined in rfc3630 and rfc5329 can continue to be advertised > in legacy TE Opaque LSAs when used with RSVP-TE/GMPLS > > - Maximum Reservable Link and Bandwidth and Unreserved Bandwidth as > RSVP-TE specific attributes MUST only use the TE Opaque LSAs and MUST > never be advertised in ASLA. > > - we do support app bit in ASLA TLV for RSVP-TE. This allows attributes > that are allowed to be advertised in ASLA TLV to be associated with RSVP-TE. > > - It might be worth including stronger wording in §2.1. > > > ##PP > there can not be a stronger wording. > > - Given that some of the sub-TLVs (from rfc3630 and rfc5329) are > reused (§4.3 through §7), maybe it is worth providing some guidance on > not using those if RSVP-TE is the only application, or avoiding their > inclusion in the original LSAs. > > ##PP > I added a new subsection in the "Deployment Considerations" to describe > the above RSVP case and the case of Maximum Reservable Link Bandwidth > and Unreserved Bandwidth/ > > > > 434 6. Local Interface IPv6 Address Sub-TLV > > [major] The Local/Remote Interface IPv6 Address Sub-TLVs (rfc5329) can > include multiple addresses for a link. It seems to me that it could > be possible for different applications to use different addresses. If > that is the case, then it seems that these sub-TLVs should not be > application independent. Why are they not considered to be > application specific? > > [minor] Why are IPv4 addresses not considered? > > ##PP > IPv4 local address is part of the basic spec. > IPv6 remote address has been added in rfc8379. > > > ... > 460 8.1. Use of TE LSA Advertisements > > [c] I made the same comments in §5.1 of the ISIS draft. > > 462 Bit Identifers for Standard Applications are defined in Section 3. > 463 All of the identifiers defined in this document are associated with > 464 applications which were already deployed in some networks prior to > 465 the writing of this document. Therefore, such applications have been > 466 deployed using the TE LSA advertisements. The Standard Applications > 467 defined in this document MAY continue to use TE LSA advertisements > 468 for a given link so long as at least one of the following conditions > 469 is true: > > [nit] s/Identifers/Identifiers > > ##PP > fixed > > [major] Even if specifying the behavior for the Standard Applications, > this document cannot Normatively specify anything affecting the case > where "applications have been deployed using the legacy > advertisements". s/MAY/may > > [] I think that the text in this section can be generalized to any > application, not just ones defined in this document. s/The Standard > Applications defined in this document MAY continue/The Standard > Applications may continue > > ##PP > I believe this has been closed during ISIS review. > I also added a sentence at the end of this section to match ISIS. > > > > 471 The application is RSVP-TE > > 473 The application is SRTE or LFA and RSVP-TE is not deployed > 474 anywhere in the network > > 476 The application is SRTE or LFA, RSVP-TE is deployed in the > 477 network, and both the set of links on which SRTE and/or LFA > 478 advertisements are required and the attribute values used by SRTE > 479 and/or LFA on all such links is fully congruent with the links and > 480 attribute values used by RSVP-TE > > [] To generalize: > > o A single application is deployed in the network > > o Multiple applications are deployed in the network and all the > links and > attribute values are fully congruent between them. > > 482 Under the conditions defined above, implementations which support the > 483 extensions defined in this document have the choice of using TE LSA > 484 advertisements or application specific advertisements in support of > 485 SRTE and/or LFA. This will require implementations to provide > 486 controls specifying which type of advertisements are to be sent/ > 487 processed on receive for these applications. Further discussion of > 488 the associated issues can be found in Section 10. > > [] To generalize: s/in support of SRTE and/or LFA/in support of other > applications > > 490 New applications which future documents define to make use of the > 491 advertisements defined in this document MUST NOT make use of TE LSA > 492 advertisements. > > [major] Why not? Just as the cases above, the application may run my > itself on the network, and/or the attributes may be fully congruent. > > > ##PP > again, this has been closed with ISIS. I updated accordingly. > > > > 494 8.2. Use of Zero Length Application Identifier Bit Masks > > [minor] This section is partially redundant with the behavior > specified in §3. Please make the specification only once. > > ##PP > removed from 3. > > > 496 If link attributes are advertised associated with zero length > 497 Application Identifier Bit-Masks for both standard applications and > 498 user defined applications, then that set of link attributes MAY be > 499 used by any application. If support for a new application is > 500 introduced on any node in a network in the presence of such > 501 advertisements, these advertisements MAY be used by the new > 502 application. If this is not what is intended, then existing > 503 advertisements MUST be readvertised with an explicit set of > 504 applications specified before a new application is introduced. > > [major] s/MAY be used/may be used > It is just a statement of fact... > > ##PP > updated to match ISIS > > > 506 9. Attribute Advertisements and Enablement > > [c] This section is pretty much the same in both drafts. Consider > making the specification only once (maybe in the ISIS draft -- because > the applications are defined there) and then referencing it. Note the > generalization comment below. > > ##PP > I believe it's good to keep it for readability. I made it same as in > ISIS draft. > > > ... > 517 In the case of RSVP-TE, the advertisement of application specific > 518 link attributes implies that RSVP is enabled on that link. The > 519 absence of RSVP-TE application specific link attributes in > 520 combination with the absence of legacy advertisements implies that > 521 RSVP is NOT enabled on that link. > > [minor] Specifying by implication sounds confusing to me. Can we come > up with Normative language to accompany the text above? > > Suggestion> > The R-bit in the SABM MUST be set only if RSVP is enabled on the > corresponding link. All RSVP-enabled links MUST have a > corresponding link > attributes advertisement. > > 523 In the case of SRTE, advertisement of application specific link > 524 attributes does NOT indicate enablement of SRTE. The advertisements > 525 are only used to support constraints which may be applied when > 526 specifying an explicit path. SRTE is implicitly enabled on all links > 527 which are part of the Segment Routing enabled topology independent of > 528 the existence of link attribute advertisements. > > 530 In the case of LFA, advertisement of application specific link > 531 attributes does NOT indicate enablement of LFA on that link. > 532 Enablement is controlled by local configuration. > > 534 If, in the future, additional standard applications are defined to > 535 use this mechanism, the specification defining this use MUST define > 536 the relationship between application specific link attribute > 537 advertisements and enablement for that application. > > [] To generalize: > > Suggestion> > For Standard Applications, advertisement of application specific link > attributes does NOT indicate enablement of the application on that > link. If > additional Standard Applications are defined with a different enablement > expectation, then the corresponding specification MUST define the > alternate > relationship between application specific link attribute > advertisements and > enablement for that application. > > 539 This document allows the advertisement of application specific link > 540 attributes with no application identifiers i.e., both the Standard > 541 Application Identifier Bit-Mask and the User Defined Application Bit > 542 Mask are not present (See Section 3). This supports the use of the > 543 link attribute by any application. In the presence of an application > 544 where the advertisement of link attribute advertisements is used to > 545 infer the enablement of an application on that link (e.g., RSVP-TE), > 546 the absence of the Application Identifier leaves ambiguous whether > 547 that application is enabled on such a link. This needs to be > 548 considered when making use of the "any application" encoding. > > [major] What does the use of the "any application" encoding say about > RSVP-TE? My interpretation is that if RSVP-TE is used, then the "any > application" encoding can't be used. Is that correct? Please be > specific. > > ##PP > I hope all the above comments were addressed by reusing ISIS text, which > has been approved already. > > > 550 10. Backward Compatibility > > [major] This section talks about the case where legacy advertisements > are already in use. This document cannot Normatively define what > those deployments do, because by definition they are not necessarily > implementing this specification. IOW, phrases like "OSPF routers in > that domain SHOULD continue to advertise" are out of place. > > [] Instead of trying to fix the text, I believe that the §8.1 already > covers the scenarios discussed here. Also, please consider > "importing" the 7.* sub-sections from the ISIS draft. > > ##PP > done > > ... > 556 In fact, there is at least one OSPF implementation that utilizes the > 557 link attributes advertised in TE Opaque LSAs [RFC3630] for Non-RSVP > 558 TE applications. For example, this implementation of LFA and remote > 559 LFA utilizes links attributes such as Shared Risk Link Groups (SRLG) > 560 [RFC4203] and Admin Group [[RFC3630] advertised in TE Opaque LSAs. > 561 These applications are described in [RFC5286], [RFC7490], [RFC7916] > 562 and [RFC8102]. > > [nit] s/Non-RSVP TE/Non-RSVP-TE > > 564 When an OSPF routing domain includes routers using link attributes > 565 from the OSPFv2 TE Opaque LSAs or the OSPFv3 Intra-Area-TE-LSA for > 566 Non-RSVP TE applications defined in this document (i.e. SRTE and > 567 LFA), OSPF routers in that domain SHOULD continue to advertise such > 568 OSPFv2 TE Opaque LSAs or the OSPFv3 Intra-Area-TE-LSA. In such a > 569 deployment, the advertised attributes SHOULD be the same and Non- > 570 RSVP application access to link attributes is a matter of local > 571 policy. > > [nit] s/Non-RSVP TE/Non-RSVP-TE > > [nit] s/Non-RSVP/Non-RSVP-TE > > 573 When advertising link-attributes for any new applications other then > 574 RSVP-TE, SRTE or LFA, OSPF routers MUST NOT use TE Opaque LSA or > 575 OSPFv3 Intra-Area-TE-LSA. Instead, advertisement in the OSPFv2 > 576 Extended Link Attributes LSAs or OSPFv3 E-Router-LSA MUST be used. > > [major] (A similar statement was made in §8.1.) Why? Just as the > cases from §8.1, the application may run my itself on the network, > and/or the attributes may be fully congruent. > > 578 It is RECOMMENDED to advertise link-attributes for RSVP-TE in the > 579 existing TE LSAs. > > [major] When is it ok to not do so? IOW, why isn't it "REQUIRED"? > I'm asking this question as a matter of process, but the conditions > laid out in §8.1 seems to already answer the question. As I mentioned > above, the cases in this section seem to already be covered in §8.1. > > > ##PP > I hope all the above comments were addressed by reusing and modifying > ISIS pieces as needed. > > > > 581 11. Security Considerations > ... > 591 Implementations MUST assure that malformed TLV and Sub-TLV defined in > 592 this document are detected and do not provide a vulnerability for > 593 attackers to crash the OSPF router or routing process. Reception of > 594 a malformed TLV or Sub-TLV SHOULD be counted and/or logged for > 595 further analysis. Logging of malformed TLVs and Sub-TLVs SHOULD be > 596 rate-limited to prevent a Denial of Service (DoS) attack (distributed > 597 or otherwise) from overloading the OSPF control plane. > > [major] "Implementations MUST assure that malformed TLV and Sub-TLV > defined in this document are detected and do not provide a > vulnerability for attackers to crash the OSPF router or routing > process." How can this be Normatively enforced? How is the > individual ability of an implementation to avoid crashes required for > interoperability? IOW, I don't think you can use "MUST" in the > sentence above. s/MUST/must > > ##PP > Above text is used in several OSPF RFCs - rfc8476 being an example. I > change to "must". > > > [major] What about vulnerabilities introduced by this document? This > document doesn't define new TE-related attributes, just a new way to > advertise them...perhaps include something like this: > > This document defines a new way to advertise already defined TE > Attributes. > As the ASLA sub-TLV is not used for SPF computation or normal > routing, the > extensions specified here have no direct effect on IP routing. > Tampering > with the information defined in this document may have an effect on > applications using it, including potential sub-optimal Traffic > Engineering. > This is not new...see [RFC5305], [RFC5307], [RFC6119], and [RFC8570]. > > And then there are other possible vulnerabilities introduced by the > new encodings... For example, a rogue router can render the data > unusable by setting the incorrect bit-mask... At best, this action > could result in sub-optimal paths (by taking some links out of > consideration)... Consider adding text related to that. > > ##PP > I added the text similar to what is in the ISIS draft. > > > > 599 12. IANA Considerations > > 601 12.1. OSPFv2 > > 603 OSPFv2 Extended Link TLV Sub-TLVs registry [RFC7684] defines sub-TLVs > 604 at any level of nesting for OSPFv2 Extended Link TLVs. This > 605 specification updates OSPFv2 Extended Link TLV sub-TLVs registry with > 606 the following TLV types: > > [nit] s/OSPFv2 Extended Link TLV/The OSPFv2 Extended Link TLV > > ##PP > done > > [major] s/This specification updates OSPFv2 Extended Link TLV sub-TLVs > registry with the following TLV types:/IANA has assigned the following > TLV types: > > ##PP > done > ... > 633 12.2. OSPFv3 > > 635 OSPFv3 Extended LSA Sub-TLV Registry [RFC8362] defines sub-TLVs at > 636 any level of nesting for OSPFv3 Extended LSAs. This specification > 637 updates OSPFv3 Extended LSA Sub-TLV Registry with the following TLV > 638 types: > > [nit] s/OSPFv3 Extended LSA Sub-TLV/The OSPFv3 Extended LSA Sub-TLV > > ##PP > done > > [major] s/This specification updates OSPFv3 Extended LSA Sub-TLV > Registry with the following TLV types:/IANA has assigned the following > TLV types: > > ##PP > done > > > ... > 737 15.2. Informative References > > [major] These references should be Normative: > > ##PP > done. > > thanks, > Peter > > > > 739 [I-D.ietf-isis-te-app] > 740 Ginsberg, L., Psenak, P., Previdi, S., Henderickx, W., and > 741 J. Drake, "IS-IS TE Attributes per application", draft- > 742 ietf-isis-te-app-08 (work in progress), October 2019. > > 744 [RFC2328] Moy, J., "OSPF Version 2", STD 54, RFC 2328, > 745 DOI 10.17487/RFC2328, April 1998, > 746 . > > 748 [RFC4203] Kompella, K., Ed. and Y. Rekhter, Ed., "OSPF Extensions in > 749 Support of Generalized Multi-Protocol Label Switching > 750 (GMPLS)", RFC 4203, DOI 10.17487/RFC4203, October 2005, > 751 . > ... > 776 [RFC7471] Giacalone, S., Ward, D., Drake, J., Atlas, A., and S. > 777 Previdi, "OSPF Traffic Engineering (TE) Metric > 778 Extensions", RFC 7471, DOI 10.17487/RFC7471, March 2015, > 779 . > > [Lsr] AD Review of draft-ietf-ospf-te-link-attr-r… Alvaro Retana > > > > From nobody Thu May 7 00:54:20 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id E6A5A3A09F1; Thu, 7 May 2020 00:54:04 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -9.601 X-Spam-Level: X-Spam-Status: No, score=-9.601 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIMWL_WL_MED=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, SPF_PASS=-0.001, URIBL_BLOCKED=0.001, USER_IN_DEF_DKIM_WL=-7.5] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=cisco.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Fq5rlBo6uP-w; Thu, 7 May 2020 00:54:03 -0700 (PDT) Received: from aer-iport-3.cisco.com (aer-iport-3.cisco.com [173.38.203.53]) (using TLSv1.2 with cipher DHE-RSA-SEED-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 30CA13A07F7; Thu, 7 May 2020 00:54:02 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=3791; q=dns/txt; s=iport; t=1588838042; x=1590047642; h=from:subject:to:cc:references:message-id:date: mime-version:in-reply-to:content-transfer-encoding; bh=3wgxOeB77Yv+gw8Cf4n7UgqaNnZakyM7Y9O+spvWgoY=; b=EoF4eflBEflQYn4b15bhFLce6460aumubIP4x4qTg0UqkSufNh81zr9x TwJJPWuKNsyFwe6WWyyvrtXtSQbgwDPRaU72zmfc+IODvcDjJQZkX71cc TBWzkPIcy99nJbtQz0SpOT8S8C4GWMekzOq+B/aHmsGws3anPyQ6J5VIi s=; X-IPAS-Result: =?us-ascii?q?A0DMAwA3vbNe/xbLJq1mHAEBAQEBAQcBARIBAQQEAQFAg?= =?us-ascii?q?UeDGFUgEoRNiQGHWwglm14LAQEBDiMMBAEBhEQCgig4EwIDAQEBAwIDAQEBA?= =?us-ascii?q?QUBAQECAQUEbYVWDIVxAQEBAQIBIw8BBTMOBQsLFAQCAiYCAlcGAQwIAQGDI?= =?us-ascii?q?gGCXCAPr0J2gTKFUINOgToGgQ4qjF6BQT+BEAEnDIJdPoJnAoR3gmAEjmyTX?= =?us-ascii?q?5AGglKCcIUoj3gGHYJbiGGEVI0QkBeJVJNwgWkigVYzGggbFRqDC08YDZlIh?= =?us-ascii?q?UQ/A2cCBgEHAQEDCZABLIIZAQE?= X-IronPort-Anti-Spam-Filtered: true X-IronPort-AV: E=Sophos;i="5.73,363,1583193600"; d="scan'208";a="23634346" Received: from aer-iport-nat.cisco.com (HELO aer-core-3.cisco.com) ([173.38.203.22]) by aer-iport-3.cisco.com with ESMTP/TLS/DHE-RSA-SEED-SHA; 07 May 2020 07:54:00 +0000 Received: from [10.60.140.51] (ams-ppsenak-nitro2.cisco.com [10.60.140.51]) by aer-core-3.cisco.com (8.15.2/8.15.2) with ESMTP id 0477rxQ0029193; Thu, 7 May 2020 07:54:00 GMT From: Peter Psenak To: Elwyn Davies , gen-art@ietf.org Cc: draft-ietf-ospf-mpls-elc.all@ietf.org, last-call@ietf.org, lsr@ietf.org References: <158877512992.25308.14489968716385236242@ietfa.amsl.com> Message-ID: <5f206fd3-8918-9c1f-e403-8591c54acf83@cisco.com> Date: Thu, 7 May 2020 09:53:59 +0200 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:60.0) Gecko/20100101 Thunderbird/60.7.0 MIME-Version: 1.0 In-Reply-To: <158877512992.25308.14489968716385236242@ietfa.amsl.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit X-Outbound-SMTP-Client: 10.60.140.51, ams-ppsenak-nitro2.cisco.com X-Outbound-Node: aer-core-3.cisco.com Archived-At: Subject: Re: [Lsr] Genart last call review of draft-ietf-ospf-mpls-elc-13 X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 07 May 2020 07:54:05 -0000 Hi Elwyn, please see inline: On 06/05/2020 16:25, Elwyn Davies via Datatracker wrote: > Reviewer: Elwyn Davies > Review result: Ready with Nits > > I am the assigned Gen-ART reviewer for this draft. The General Area > Review Team (Gen-ART) reviews all IETF documents being processed > by the IESG for the IETF Chair. Please treat these comments just > like any other last call comments. > > For more information, please see the FAQ at > > . > > Document: draft-ietf-ospf-mpls-elc-13 > Reviewer: Elwyn Davies > Review Date: 2020-05-06 > IETF LC End Date: 2020-05-05 > IESG Telechat date: 2020-05-21 > > Summary: > Ready with nits. Aside: I have to say that the convolutions and > cross-referencing of doing the OSPF and IS-IS extensions plus BGP-LS added to > the cross-linking with MPLS is leading to mind-blowing complexity. Sooner or > later something is going to blow up here! > > Major issues: > None > > Minor issues: > None > > Nits/editorial comments: > > Abstract and title :  The application to BGP-LS (s5) is not mentioned in the > abstract or the title.  Also the first use of BGP-LS needs to be expanded. Why would the BGP-LS need to be mentioned in the abstract? I have expanded the first use of BGP-LS > > Abstract: s/tunnel/LSP/ done > > s1: Suggest s/SR-MPLS/Segment Routing with the MPLS Data Plane/ > > s1: Query:  As a non-expert in this area, I was wondering if the signalling > capability is or will be implemented in IS-IS?  A brief comment on the status > wrt IS-IS would be helpful.  [It turns out that you already reference the > document that implements this later in this draft.] yes, it is being added to ISIS. Yes, this draft reference the ISIS draft. I see no reason to to include ISIS draft status in this document though. > > s1, last sentence: s/it's/it is/ done > > s3: It would be a good idea to expand 'prefix' to 'address prefix > advertisement' on its first occurrence here.  Thereafter 'prefix' is fine by me. "prefix" is being used in almost all OSPF and ISIS document, we never use address prefix. > > s3, para 3: Why would a router not advertise the ELC with all prefixes?  Can > you say why this ought not to be a MUST. advertising ELC property with prefix advertisement is optional. We can not mandate it. It would make all routers not advertising this data violating this spec. > > s4, para 3: In that case, what does the absence signify?  Should we care? the absence of ERLD-MSD advertisements only indicates that a node does not support advertisement of ERLD It can not be interpreted that ERLD is not supported. Old nodes that do not advertise ERLD-MSD can not be assumed not to support non-zero ERLD. > > s4, para 4: > This needs a correction and a reference to where the Link MSD Sub-TLV is > defined.  As a matter of interest, is there any reason why this should be sent > in an OSPF context?  If not why not just prohibit sending it? If it is received > should it provoke an error rather than being ignored? OLD: When the ERLD > MSD-Type is received in the OSPFv2 or OSPFv3 Link MSD Sub-TLV, it MUST be > ignored. NEW: > When the ERLD-MSD type is received in the OSPFv2 or OSPFv3 Link MSD Sub-TLV > [RFC8476], it MUST be ignored. done. > ENDS > > s5:  This section needs to be rewritten to be 'future proof' rather than > referring to the temporary allocations.  A note about the temporary allocations > can be added with a RFC Editor note requesting its removal on final publication. I suppose you meant section 6 - IANA Considerations. I have updated the IANA section. thanks, Peter > > > > > From nobody Thu May 7 02:17:42 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 0C3CD3A0AC8 for ; Thu, 7 May 2020 02:17:40 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.095 X-Spam-Level: X-Spam-Status: No, score=-2.095 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, HTML_MESSAGE=0.001, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, UNPARSEABLE_RELAY=0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=orange.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id eryXNnZ-I46R for ; 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tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=raszuk.net Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id nA6ZKDyx-o0I for ; Thu, 7 May 2020 02:20:43 -0700 (PDT) Received: from mail-ej1-x632.google.com (mail-ej1-x632.google.com [IPv6:2a00:1450:4864:20::632]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 4B5953A0AD0 for ; Thu, 7 May 2020 02:20:43 -0700 (PDT) Received: by mail-ej1-x632.google.com with SMTP id e2so3940738eje.13 for ; Thu, 07 May 2020 02:20:42 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=raszuk.net; s=google; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=krbhlxehCk4pljIGrb/7bosQOIzPoYhhw5kSbBBQV7k=; b=TkShdC8HsU/JiTMiFHl7vgZqvesoSJLJnWgDN/u/hCyN/+jqWYqn4rmMl8hnO0skh5 q+WBhpFapbRdC4D/KYZBqcexKcRtclgSwJ3JhSEfqrOTnKHAoD/8scGvV+doG0DqmcDv ajLX77i8QkAmic8oWItQagkoK8tgihrrPwh8g7VJh6NdaEpemMQslMDj7EcgxZZu0L0b cf1PCsSoeSIRh8JUZwimgtn2LYDWp7danxnrbYhznMV+XpHDeKYDZ5GOadROuSL/45cc zlp7nYBge8fQ4+KKy13pgQjTk81LAdDjyL6qKEoFSI8pa4fQ/r9IDw3osQkPYTUTonMA BXog== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=krbhlxehCk4pljIGrb/7bosQOIzPoYhhw5kSbBBQV7k=; b=A/QOaheeby6PM+dry9+Yh2xkdFfLWv80iod6hAIoPgy4ueyAfRd1g+mvJSd3baEgk3 NOGkEdKhiOXsjN8X7SHd0OaNpVRWJrp6pytsopzdMQOHWN4AJdkusrbeV334Cg9gdcIh V6ET3FyuEp1UTKq8fxTyC6oBe3eH9k8/6yXtC48d8NwM2lBpbHauMfrGCQiJc21FAbJj vtCVfgSWbnWT7l99sy1hdFc49cleub6TuD1Xc5jrMq6ISmkfkzWJ6ntEQCZiD8zKOa2W 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Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 07 May 2020 09:20:45 -0000 --00000000000002d8cc05a50b6519 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hey Jeff, What if in your analysis A-D link metric is 1500 ? Still A will send to B ! See in all of this discussion from my pov it is not really about danger of making LSDB inconsistent for much longer. It is however about operator upgrading to new release a router, maybe even reading release notes stating that flooding speed optimizations defined in RFC ZZZ are implemented and final effect he sees are microloops lasting 10s of seconds for his traffic. Yes some vendors have good tools to protect from microloops, but those must be enabled. Moreover those still require manual timer configuration how long to keep loop free protection in place. And I am not aware any vendor has a cli command showing how long it took in all routers in my area/level to install in FIB result of various levels/cases of topology changes. So I am not saying faster is not good. I am saying if you make car faster do not forget to equip it with seat belts and make enough of warnings that driver will actually fasten them. Best, R. On Thu, May 7, 2020 at 6:41 AM Jeff Tantsura wrote: > Robert, > > Assuming C and E provide access to the same set of destinations, that are > closer of further away from C and E. > B (which is fast), after it notifies A that it can=E2=80=99t reach C dire= ctly will > cause A to send traffic to D. D - dependent on total cost would start > happily sending some traffic towards destinations behind C to B so LFA on= B > wouldn=E2=80=99t really help. > > Cheers, > Jeff > --00000000000002d8cc05a50b6519 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hey Jeff,

What if in your an= alysis A-D link metric is 1500 ? Still A will send to B !

See in all of this discussion from my pov it is not really about da= nger of making LSDB inconsistent for much longer.=C2=A0

It is however about operator upgrading to new release a router, maybe= even reading release notes stating that flooding speed optimizations defin= ed in RFC ZZZ are implemented and final effect he sees are microloops=C2=A0= lasting 10s of seconds for his traffic.=C2=A0

Yes = some vendors have good tools to protect from microloops, but those must be = enabled. Moreover those still require manual timer configuration how long t= o keep loop free protection in place. And I am not aware any vendor has a c= li command=C2=A0showing how long it took in all routers in my area/level to= install in FIB result of various levels/cases of topology changes.=C2=A0

So I am not saying faster is not good. I am saying = if you make car faster do not forget to equip it with seat belts and make e= nough of=C2=A0warnings that driver will actually fasten them.=C2=A0

Best,
R.

On Thu, May 7, 2= 020 at 6:41 AM Jeff Tantsura <jefftant.ietf@gmail.com> wrote:
Robert,

Assuming C and E provide access to the same set of destinations, that are c= loser of further away from C and E.
B (which is fast), after it notifies A that it can=E2=80=99t reach C direct= ly will cause A to send traffic to D. D - dependent on total cost would sta= rt happily sending some traffic towards destinations behind C to B so LFA o= n B wouldn=E2=80=99t really help.

Cheers,
Jeff
--00000000000002d8cc05a50b6519-- From nobody Thu May 7 03:28:55 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 691153A0B74 for ; Thu, 7 May 2020 03:28:52 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.898 X-Spam-Level: X-Spam-Status: No, score=-1.898 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id foyZxUC5QZNw for ; Thu, 7 May 2020 03:28:49 -0700 (PDT) Received: from huawei.com (lhrrgout.huawei.com [185.176.76.210]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 4A4F43A0B72 for ; Thu, 7 May 2020 03:28:49 -0700 (PDT) Received: from lhreml718-chm.china.huawei.com (unknown [172.18.7.107]) by Forcepoint Email with ESMTP id AB9A98EFE4B1314E256C for ; Thu, 7 May 2020 11:28:44 +0100 (IST) Received: from dggeme703-chm.china.huawei.com (10.1.199.99) by lhreml718-chm.china.huawei.com (10.201.108.69) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256) id 15.1.1913.5; Thu, 7 May 2020 11:28:44 +0100 Received: from dggeme752-chm.china.huawei.com (10.3.19.98) by dggeme703-chm.china.huawei.com (10.1.199.99) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.1913.5; Thu, 7 May 2020 18:28:41 +0800 Received: from dggeme752-chm.china.huawei.com ([10.6.80.76]) by dggeme752-chm.china.huawei.com ([10.6.80.76]) with mapi id 15.01.1913.007; Thu, 7 May 2020 18:28:41 +0800 From: "Gengxuesong (Geng Xuesong)" To: "tony.li@tony.li" CC: "lsr@ietf.org" , Christian Hopps Thread-Topic: [Lsr] Congestion (flow) control thoughts. Thread-Index: AQHWHiEz1dI/yoz7M0KHaDn4nVfYx6iQ5nmAgABsaICACVON4IAAFo8AgAG5X4A= Date: Thu, 7 May 2020 10:28:41 +0000 Message-ID: References: <8016231f9ff94bd2b0f5ef989608922f@huawei.com> <21e4996c370b475db4eb4e7ffc298434@huawei.com> <364EDB68-ABA4-4AA9-910E-065A15DB0965@tony.li> In-Reply-To: <364EDB68-ABA4-4AA9-910E-065A15DB0965@tony.li> Accept-Language: zh-CN, en-US Content-Language: zh-CN X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.108.148.72] Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 MIME-Version: 1.0 X-CFilter-Loop: Reflected Archived-At: Subject: Re: [Lsr] Congestion (flow) control thoughts. 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Thu, 07 May 2020 06:10:38 -0700 (PDT) Received: from 1058052472880 named unknown by gmailapi.google.com with HTTPREST; Thu, 7 May 2020 06:10:37 -0700 From: Alvaro Retana MIME-Version: 1.0 Date: Thu, 7 May 2020 06:10:37 -0700 Message-ID: To: lsr@ietf.org Cc: draft-ietf-ospf-mpls-elc@ietf.org, "lsr-chairs@ietf.org" , "Acee Lindem (acee)" Content-Type: multipart/alternative; boundary="0000000000005a531d05a50e9b08" Archived-At: Subject: [Lsr] OSPFv3 Implementations of draft-ietf-ospf-mpls-elc X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 07 May 2020 13:10:42 -0000 --0000000000005a531d05a50e9b08 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Dear lsr WG: If you=E2=80=99ve been following the progress of this document, you will ha= ve noticed that it is already in IESG Evaluation. IANA discovered a typo in the draft; the current text says "Bit 0x04 in the "OSPFv3 Prefix Options (8 bits) registry has been assigned to the E-Flag (ELC Flag)=E2=80=9D. However, the value assigned by IANA is 0x40. Does anyone have an OSPFv3 implementation of this document? If so, which value is used, 0x04 or 0x40? Are there deployments? The Shepherd report doesn=E2=80=99t mention any implementations, and with t= he help of the authors it has already been confirmed that cisco, Nokia and Huawei don=E2=80=99t have an OSPFv3 implementation. Please respond by COB on May 14. Thanks! Alvaro. --0000000000005a531d05a50e9b08 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable =
Dear lsr WG:

If you=E2=80=99ve been following the progress of this = document, you will have noticed that it is already in IESG Evaluation.

IANA discovered a typo = in the draft; the current text says "Bit 0x04 in the "OSPFv3 Pref= ix Options (8 bits) registry has been assigned to the E-Flag (ELC Flag)=E2= =80=9D. =C2=A0 However, the value assigned by IANA is 0x40.=C2=A0


Does anyone have an OSPFv3 impleme= ntation of this document?=C2=A0 If so, which value is used, 0x04 or 0x40?= =C2=A0 Are there deployments?


The Shepherd report doesn=E2=80=99t mention any implementations, and wi= th the help of the authors it has already been confirmed that cisco, Nokia = and Huawei don=E2=80=99t have an OSPFv3 implementation.


Please respond by COB on May 14.


Thanks!

Alvaro.
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cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Thu, 07 May 2020 08:28:10 -0700 (PDT) Sender: Tony Li Content-Type: text/plain; charset=utf-8 Mime-Version: 1.0 (Mac OS X Mail 13.4 \(3608.80.23.2.2\)) From: tony.li@tony.li In-Reply-To: Date: Thu, 7 May 2020 08:28:08 -0700 Cc: "lsr@ietf.org" , Christian Hopps Content-Transfer-Encoding: quoted-printable Message-Id: <0B3A2CF5-559C-4C49-93FD-9FE116D049DE@tony.li> References: <8016231f9ff94bd2b0f5ef989608922f@huawei.com> <21e4996c370b475db4eb4e7ffc298434@huawei.com> <364EDB68-ABA4-4AA9-910E-065A15DB0965@tony.li> To: "Gengxuesong (Geng Xuesong)" X-Mailer: Apple Mail (2.3608.80.23.2.2) Archived-At: Subject: Re: [Lsr] Congestion (flow) control thoughts. X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 07 May 2020 15:28:14 -0000 Hi Xuesong, > I agree that "minimal flooding time " is a good choice, which may = differ from the traditional cc in layer 4, which is difficult to get the = completion time for each flow. > I am still a little confused about " fast brand X needs to not overrun = slow brand Y while performing well with fast brand Z". Is this talking = about interoperation between different company device, which may use = different type of cc mechanism? Yes, I=E2=80=99m talking about interoperability.=20 Normally, in this working group, interoperability implies that each = implementation is sending and receiving correctly formatted packets and = computing correctly. This particular item adds in one other degree of = complexity: timeliness. An implementation must be able to go fast or = slow, depending on the needs of the receiver. Tony From nobody Thu May 7 08:52:57 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 07B003A0A93 for ; Thu, 7 May 2020 08:52:52 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.499 X-Spam-Level: X-Spam-Status: No, score=-1.499 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FORGED_FROMDOMAIN=0.25, FREEMAIL_FROM=0.001, HEADER_FROM_DIFFERENT_DOMAINS=0.249, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001] autolearn=no autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id T-yVZ8kBL4dm for ; Thu, 7 May 2020 08:52:50 -0700 (PDT) Received: from mail-pf1-x433.google.com (mail-pf1-x433.google.com [IPv6:2607:f8b0:4864:20::433]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 73A653A0A51 for ; Thu, 7 May 2020 08:52:46 -0700 (PDT) Received: by mail-pf1-x433.google.com with SMTP id w65so3175327pfc.12 for ; Thu, 07 May 2020 08:52:46 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=sender:from:message-id:mime-version:subject:date:in-reply-to:cc:to :references; bh=9gXvVor5MHf04Idah4TOJPtYPptXOomYuoUOUNnRoVM=; b=QkP5nPJmMgMpDHFp6MDuA1ZAJGz/dMuj8SXzMJDTxESaRI73yxDVm1Sc8atKWlJNXZ CRxHPgKEHOPNpq47zlVq2kNO2FK+WKCKkEsUp+N3Jxl6olirAshfhHeLuOHhp2rK0I1X ZUn7GwLpN3IxINp32UH+5ewHSYltl6YqGKFCcGOSN0zluv5YbwtGXB/R1wYqd8hpsa/b EZQBX50DlnfNihgwZoh2JAxIru+va0bjtukpIq3vSXsFEI9OrnaCTnGyezIWFk0oEvtA 5iXbHIDE+zmMWKtSoBA8sxNpIkUb70VU6LsumIA1SrvS/PzorKhHqC1CS5+FM/pgTFR5 BWgQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:from:message-id:mime-version:subject:date :in-reply-to:cc:to:references; bh=9gXvVor5MHf04Idah4TOJPtYPptXOomYuoUOUNnRoVM=; b=rFKsP67uIHtqPo4aXJc5qHVdhIXoY6kRKWz13gzHVT9++BLRiWP/JadlAdcD1aBQCM 4UC9FJ0rKlYe+JYlSbZTPB5cGTmebJjiw+zPawew0YQXyXlanAMVMPtCri66viaIHy6f vSoXhXSGNUeeliNIJQ0RsWRUiAqHvIbwz0ZogLlLsVDAONbynPxb5cEaIJ4zwKhKxTt+ 5e0T8eQNNfQjbykAs8jX+ZCSFjgwCw8pM2goTqKyOJy5qEUXO1dqwsr3akhRq2B9DpM7 NNXyt0Ur3ZK983HTlJT0vHEfXsgN6mpgqDLdWOHrkFYJqgfb7P38T5VgMFsisAa3P2/C sgJQ== X-Gm-Message-State: AGi0PuYTmFCfKOh2+Har6KHJa0JLrFXshj5QNOkBCiBGtCco6wNw+OxL c1rQpldgGWb+rK6QTWpbbAh4qBFK X-Google-Smtp-Source: APiQypLQVpgY2qocORWJrQqPqNyICY2rb9NBK/2mmWenKNVjvOzeHMED8WOxGXoNucEeL57yWPJpFg== X-Received: by 2002:aa7:8594:: with SMTP id w20mr14828881pfn.137.1588866765840; Thu, 07 May 2020 08:52:45 -0700 (PDT) Received: from [10.95.84.23] ([162.210.129.5]) by smtp.gmail.com with ESMTPSA id i13sm220807pja.40.2020.05.07.08.52.44 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Thu, 07 May 2020 08:52:45 -0700 (PDT) Sender: Tony Li From: tony.li@tony.li Message-Id: <73606233-D019-4ABC-B1AB-9ED4FECC782C@tony.li> Content-Type: multipart/alternative; boundary="Apple-Mail=_3E0A45CE-BA85-485D-9B31-7EC383F2CCCA" Mime-Version: 1.0 (Mac OS X Mail 13.4 \(3608.80.23.2.2\)) Date: Thu, 7 May 2020 08:52:43 -0700 In-Reply-To: Cc: "bruno.decraene@orange.com" , "lsr@ietf.org" , Christian Hopps To: "Les Ginsberg (ginsberg)" References: <24209_1588692477_5EB185FD_24209_35_1_53C29892C857584299CBF5D05346208A48E3D455@OPEXCAUBM43.corporate.adroot.infra.ftgroup> <6287_1588771252_5EB2B9B4_6287_332_1_53C29892C857584299CBF5D05346208A48E3F698@OPEXCAUBM43.corporate.adroot.infra.ftgroup> <10562_1588775602_5EB2CAB2_10562_251_11_53C29892C857584299CBF5D05346208A48E3FB63@OPEXCAUBM43.corporate.adroot.infra.ftgroup> <87CDE7F3-E08D-4C45-9AF1-9DAD635F8908@chopps.org> <9992_1588784982_5EB2EF56_9992_201_1_53C29892C857584299CBF5D05346208A48E40256@OPEXCAUBM43.corporate.adroot.infra.ftgroup> <6544_1588843052_5EB3D22C_6544_99_1_53C29892C857584299CBF5D05346208A48E415A8@OPEXCAUBM43.corporate.adroot.infra.ftgroup> X-Mailer: Apple Mail (2.3608.80.23.2.2) Archived-At: Subject: Re: [Lsr] Flooding across a network X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 07 May 2020 15:52:52 -0000 --Apple-Mail=_3E0A45CE-BA85-485D-9B31-7EC383F2CCCA Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=utf-8 Les, =20 > I have specifically used an example where =E2=80=9Cmicroloop = avoidance=E2=80=9D is not applicable. So I did not want to use the term = =E2=80=9Cmicroloop=E2=80=9D but rather used =E2=80=9Cloop=E2=80=9D so as = not to suggest that =E2=80=9Cmicroloop avoidance=E2=80=9D is a potential = solution for the sub-optimal behavior. > Hope you can appreciate that point. > =20 > It would be easy enough to include more nodes in the topology which = only support slow flooding. The end result would be the same. > I have kept the example simple in the hopes we could more easily agree = that what I describe can happen when not all nodes support faster = flooding =E2=80=93 which is the only point I am trying to make. Whether = the ratio of Fast/Slow nodes is large or small or about the same = doesn=E2=80=99t eliminate the possibility that the same behavior could = be seen =E2=80=93 though it might alter the location of the topology = change which would be problematic. > =20 > =46rom an operator=E2=80=99s POV, I am pretty sure that what you = really care about is whether packets get successfully forwarded or not. = I am demonstrating that it isn=E2=80=99t safe to assume forwarding = behavior will be optimal when not all nodes support fast flooding. Your point is well-made. There are certainly going to be topologies = where making flooding faster would result in worse behavior. However, the point is that there are also topologies where flooding = faster would improve convergence. To support those, we must have faster = flooding. Please focus on that goal. Regards, Tony --Apple-Mail=_3E0A45CE-BA85-485D-9B31-7EC383F2CCCA Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=utf-8

Les,

 
I have specifically used an example = where =E2=80=9Cmicroloop avoidance=E2=80=9D is not applicable. So I did = not want to use the term =E2=80=9Cmicroloop=E2=80=9D but rather used = =E2=80=9Cloop=E2=80=9D so as not to suggest that =E2=80=9Cmicroloop = avoidance=E2=80=9D is a potential solution for the sub-optimal = behavior.
Hope you can appreciate that point.
 
It would = be easy enough to include more nodes in the topology which only support = slow flooding. The end result would be the same.
I have = kept the example simple in the hopes we could more easily agree that = what I describe can happen when not all nodes support faster flooding = =E2=80=93 which is the only point I am trying to make. Whether the ratio = of Fast/Slow nodes is large or small or about the same doesn=E2=80=99t = eliminate the possibility that the same behavior could be seen =E2=80=93 = though it might alter the location of the topology change which would be = problematic.
 
=46rom an operator=E2=80=99s POV, I am pretty sure that what = you really care about is whether packets get successfully forwarded or = not. I am demonstrating that it isn=E2=80=99t safe to assume forwarding = behavior will be optimal when not all nodes support fast = flooding.


Your point is well-made. There are certainly going = to be topologies where making flooding faster would result in worse = behavior.

However, the point is that = there are also topologies where flooding faster would improve = convergence. To support those, we must have faster flooding. Please = focus on that goal.

Regards,
Tony


= --Apple-Mail=_3E0A45CE-BA85-485D-9B31-7EC383F2CCCA-- From nobody Thu May 7 09:02:49 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 7FB513A0A96 for ; Thu, 7 May 2020 09:02:46 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.095 X-Spam-Level: X-Spam-Status: No, score=-2.095 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, HTML_MESSAGE=0.001, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, UNPARSEABLE_RELAY=0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=orange.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id N5dV_28t64Ru for ; 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X-Spam-Status: No, score=-1.898 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id yPtEeLWhf_MB for ; Fri, 8 May 2020 01:31:40 -0700 (PDT) Received: from huawei.com (lhrrgout.huawei.com [185.176.76.210]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 7F6B23A0400 for ; Fri, 8 May 2020 01:31:40 -0700 (PDT) Received: from lhreml702-chm.china.huawei.com (unknown [172.18.7.108]) by Forcepoint Email with ESMTP id 703ECD0E967D830AC86C for ; Fri, 8 May 2020 09:31:38 +0100 (IST) Received: from dggeme704-chm.china.huawei.com (10.1.199.100) by lhreml702-chm.china.huawei.com (10.201.108.51) with Microsoft SMTP Server (version=TLS1_2, 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Thread-Index: AQHWHiEz1dI/yoz7M0KHaDn4nVfYx6iQ5nmAgABsaICACVON4IAAFo8AgAG5X4D//899AIABo9Gw Date: Fri, 8 May 2020 08:31:35 +0000 Message-ID: <1776b2faecdb4a73a789dd0632cb9cbb@huawei.com> References: <8016231f9ff94bd2b0f5ef989608922f@huawei.com> <21e4996c370b475db4eb4e7ffc298434@huawei.com> <364EDB68-ABA4-4AA9-910E-065A15DB0965@tony.li> <0B3A2CF5-559C-4C49-93FD-9FE116D049DE@tony.li> In-Reply-To: <0B3A2CF5-559C-4C49-93FD-9FE116D049DE@tony.li> Accept-Language: zh-CN, en-US Content-Language: zh-CN X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.108.148.72] Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 MIME-Version: 1.0 X-CFilter-Loop: Reflected Archived-At: Subject: Re: [Lsr] Congestion (flow) control thoughts. 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Fri, 8 May 2020 21:37:28 +0800 (HKT) Received: from CNSHPPEXCH1605.nsn-intra.net (135.251.51.105) by CNSHPPEXCH1601.nsn-intra.net (135.251.51.101) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.1847.3; Fri, 8 May 2020 21:37:27 +0800 Received: from CNSHPPEXCH1605.nsn-intra.net ([135.251.51.105]) by CNSHPPEXCH1605.nsn-intra.net ([135.251.51.105]) with mapi id 15.01.1847.007; Fri, 8 May 2020 21:37:27 +0800 From: "Wang, Weibin (NSB - CN/Shanghai)" To: "lsr@ietf.org" Thread-Topic: draft-ietf-lsr-flex-algo Thread-Index: AdYlOXl7J26ZJEOiSNe/050l75qS7g== Date: Fri, 8 May 2020 13:37:27 +0000 Message-ID: <7255730c312a40a1a2d36972095845a4@nokia-sbell.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [135.251.51.115] Content-Type: multipart/alternative; boundary="_000_7255730c312a40a1a2d36972095845a4nokiasbellcom_" MIME-Version: 1.0 X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFnrFLMWRmVeSWpSXmKPExsXS/ts4VXdmwtY4g117GC1OPFnB6sDosWTJ T6YAxigum5TUnMyy1CJ9uwSujDm3etkLFilWTPo/m7mB8bpMFyMnh4SAicSpkw1sXYxcHEIC h5gk9m+byQiSEBL4wyhxoK8cIrGRUaLtzzUmkASbgJvEpG27gDo4OEQEFCU2/zQGCQsDmQ9m NbKB2CICahL7N91jhrD1JFa83AHWyiKgIjHj0S+w+bwCdhJ9ze9YQWxGATGJ76fWgNUwC4hL 3HoynwniOAGJJXvOM0PYohIvH/9jBVkrIaAk0bcBqjxVYtfC3ewQIwUlTs58wjKBUWgWkkmz kJTNQlIGEdeRWLD7ExuErS2xbOFrZhj7zIHHTMjiCxjZVzFKO/sFe3gF+3r6GZjq+fl7ezrq Bju5+vjoOfv7bmIERscaiUlzdzA2zfygd4iRiYPxEKMEB7OSCO/Eii1xQrwpiZVVqUX58UWl OanFhxilOViUxHnXGa+MExJITyxJzU5NLUgtgskycXBKNTBVsq5fWpUU6Pbfuv/r3/P+m+28 g8vCiwWyqx0nb9FSuX3Msy/Q+s2Od0a+t0XNsv65sr5SCPu2Y5Ug4wvbdPGQZWF/6uRX9OQ/ SpactfTMZ9eWhua+o6czr29+2bxMY9eqy1GMf+YrNUys+vjDsKrqvYVfv69DkVaVs4h4wbYD ri8cffval6vmylfIJeyeLRSSv+6zfXbV2c5f3T3mBwTucU2U9A2Y8cbYzNQqu/voj8UPLoau UBQxPXZxXtTE930VZ9l0Xpv7f7yrc6N8o0bepf2pt3YquzOt+/o0zoc336SEM8RIf+/Jjsk6 RqZ5kiW9U+WfSx66pLqb51l1o2xf/vunUz8vyY27sqigTomlOCPRUIu5qDgRAGaMDfX9AgAA Archived-At: Subject: [Lsr] draft-ietf-lsr-flex-algo X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 08 May 2020 13:37:40 -0000 --_000_7255730c312a40a1a2d36972095845a4nokiasbellcom_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hi authors: After reading through this draft lsr-flex-algo, I want to know whether ther= e is a potential goal of this draft to reduce the SRH size with enabling fl= ex-algo with admin group in SRv6 deployment, because without flex-algo we h= ave to have a big SRH size when the SRH include more SRv6 SIDs, if we enabl= e flex-algo under special topology and link constraint condition, in theory= we can even construct a end to end SR path/tunnel without SRH, but it sti= ll meet TE requirement. So my question is whether the flex-algo can be used= as tool to reduce SRH size? Cheers ! WANG Weibin --_000_7255730c312a40a1a2d36972095845a4nokiasbellcom_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Hi authors:

 

After reading through this draft lsr-flex-algo, I wa= nt to know whether there is a potential goal of this draft to reduce the SR= H size with enabling flex-algo with admin group in SRv6 deployment, because= without flex-algo we have to have a big SRH size when the SRH include more SRv6 SIDs, if we enable flex-algo= under special topology and link constraint condition, in theory we can eve= n construct  a end to end SR path/tunnel without SRH, but it still mee= t TE requirement. So my question is whether the flex-algo can be used as tool to reduce SRH size?

 

 

 

Cheers !

 

WANG Weibin

--_000_7255730c312a40a1a2d36972095845a4nokiasbellcom_-- From nobody Fri May 8 23:25:20 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id CA8703A080E for ; Fri, 8 May 2020 23:25:16 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.898 X-Spam-Level: X-Spam-Status: No, score=-1.898 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_PASS=-0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 32rG--FumO-v for ; Fri, 8 May 2020 23:25:14 -0700 (PDT) Received: from huawei.com (lhrrgout.huawei.com [185.176.76.210]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id B10F83A0809 for ; Fri, 8 May 2020 23:25:14 -0700 (PDT) Received: from lhreml716-chm.china.huawei.com (unknown [172.18.7.106]) by Forcepoint Email with ESMTP id 52D5B3D60597CD29222A for ; Sat, 9 May 2020 07:25:12 +0100 (IST) Received: from nkgeml707-chm.china.huawei.com (10.98.57.157) by lhreml716-chm.china.huawei.com (10.201.108.67) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.1913.5; Sat, 9 May 2020 07:25:11 +0100 Received: from dggeme752-chm.china.huawei.com (10.3.19.98) by nkgeml707-chm.china.huawei.com (10.98.57.157) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256) id 15.1.1913.5; Sat, 9 May 2020 14:25:09 +0800 Received: from dggeme752-chm.china.huawei.com ([10.6.80.76]) by dggeme752-chm.china.huawei.com ([10.6.80.76]) with mapi id 15.01.1913.007; Sat, 9 May 2020 14:25:08 +0800 From: "Gengxuesong (Geng Xuesong)" To: "tony.li@tony.li" , "sarahchen@arista.com" CC: "lsr@ietf.org" Thread-Topic: [Lsr] Questions about draft-ietf-lsr-dynamic-flooding-04 Thread-Index: AdYlyowYbZl6t8IpSKWUsfFF00+SFQ== Date: Sat, 9 May 2020 06:25:08 +0000 Message-ID: <28604621f41f45a5a6b870413c4318e0@huawei.com> Accept-Language: zh-CN, en-US Content-Language: zh-CN X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.108.203.157] Content-Type: multipart/alternative; boundary="_000_28604621f41f45a5a6b870413c4318e0huaweicom_" MIME-Version: 1.0 X-CFilter-Loop: Reflected Archived-At: Subject: [Lsr] Questions about draft-ietf-lsr-dynamic-flooding-04 X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 09 May 2020 06:25:18 -0000 --_000_28604621f41f45a5a6b870413c4318e0huaweicom_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hi Tony, Sarah Thank you for your work about Flooding Reduction mechanism. I think it is v= ery useful for IGP scalability. When Sarah giving presentation for draft-chen-lsr-dynamic-flooding-algorith= m-00 in LSR interim meeting, I raised a question about how to handle multip= oint failure in the flooding topology. I remembered that draft-ietf-lsr-dyn= amic-flooding-04 was mentioned. I have read this draft, especially section = 6.8.11 and temporary flooding relevant content. I think it is a valid metho= d logically. (We have tried to raise some examples to challenge this method= , but in all these cases, this method works) Considering that reliability o= f IGP is crucial for deployment, we are still wondering whether some mathem= atical proof is necessary (or possible) to guarantee that, in all the possi= ble scenarios, proper convergence could be achieved when using flooding red= uction algorithm, just as traditional IGP mechanism. The proof may be case = by case depending on the flooding reduction algorithm, but we think even so= me example or clue about how to do this will be very helpful. Best Regards Xuesong --_000_28604621f41f45a5a6b870413c4318e0huaweicom_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Hi Tony, Sarah

 

Thank you for your work about Flooding Reduction mechanism.= I think it is very useful for IGP scalability.

When Sarah giving presentation for draft-chen-lsr-dynamic-f= looding-algorithm-00 in LSR interim meeting, I raised a question about how = to handle multipoint failure in the flooding topology. I remembered that draft-ietf-lsr-dynamic-flooding-04 was mentioned. I have= read this draft, especially section 6.8.11 and temporary flooding relevant= content. I think it is a valid method logically. (We have tried to raise s= ome examples to challenge this method, but in all these cases, this method works) Considering that reliability of= IGP is crucial for deployment, we are still wondering whether some mathema= tical proof is necessary (or possible) to guarantee that, in all the possib= le scenarios, proper convergence could be achieved when using flooding reduction algorithm, just as traditi= onal IGP mechanism. The proof may be case by case depending on the flooding= reduction algorithm, but we think even some example or clue about how to d= o this will be very helpful.

 

Best Regards

Xuesong

 

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Sat, 9 May 2020 06:51:41 +0000 From: "Ketan Talaulikar (ketant)" To: "Wang, Weibin (NSB - CN/Shanghai)" , "lsr@ietf.org" Thread-Topic: draft-ietf-lsr-flex-algo Thread-Index: AdYlOXl7J26ZJEOiSNe/050l75qS7gAlJoJw Date: Sat, 9 May 2020 06:51:40 +0000 Message-ID: References: <7255730c312a40a1a2d36972095845a4@nokia-sbell.com> In-Reply-To: <7255730c312a40a1a2d36972095845a4@nokia-sbell.com> Accept-Language: en-GB, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: nokia-sbell.com; dkim=none (message not signed) header.d=none;nokia-sbell.com; dmarc=none action=none header.from=cisco.com; x-originating-ip: [49.36.52.93] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: b2b9ef37-3906-4296-c29d-08d7f3e56dcf x-ms-traffictypediagnostic: MW3PR11MB4732: x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:9508; x-forefront-prvs: 03982FDC1D x-ms-exchange-senderadcheck: 1 x-microsoft-antispam: BCL:0; x-microsoft-antispam-message-info: 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 x-forefront-antispam-report: CIP:255.255.255.255; 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boundary="_000_MW3PR11MB4570B9F5FE3774B0475B6EF6C1A30MW3PR11MB4570namp_" MIME-Version: 1.0 X-MS-Exchange-CrossTenant-Network-Message-Id: b2b9ef37-3906-4296-c29d-08d7f3e56dcf X-MS-Exchange-CrossTenant-originalarrivaltime: 09 May 2020 06:51:40.9532 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 5ae1af62-9505-4097-a69a-c1553ef7840e X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: YRAT5si6HhW4nZ1hgKJ0wPyI5H9gCrX6MdFD3BtNrUqSwjCQyYMN6OEwSTlLOu9pk+InpTi7fULSCw/hI8Vbsg== X-MS-Exchange-Transport-CrossTenantHeadersStamped: MW3PR11MB4732 X-OriginatorOrg: cisco.com X-Outbound-SMTP-Client: 173.36.7.15, xch-aln-005.cisco.com X-Outbound-Node: alln-core-1.cisco.com Archived-At: Subject: Re: [Lsr] draft-ietf-lsr-flex-algo X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 09 May 2020 06:51:47 -0000 --_000_MW3PR11MB4570B9F5FE3774B0475B6EF6C1A30MW3PR11MB4570namp_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hi Wang, You are correct. Though I wouldn't call it a goal but rather a benefit/adva= ntage - same applies to SR-MPLS where the label stack can be reduced. Thanks, Ketan From: Lsr On Behalf Of Wang, Weibin (NSB - CN/Shangh= ai) Sent: 08 May 2020 19:07 To: lsr@ietf.org Subject: [Lsr] draft-ietf-lsr-flex-algo Hi authors: After reading through this draft lsr-flex-algo, I want to know whether ther= e is a potential goal of this draft to reduce the SRH size with enabling fl= ex-algo with admin group in SRv6 deployment, because without flex-algo we h= ave to have a big SRH size when the SRH include more SRv6 SIDs, if we enabl= e flex-algo under special topology and link constraint condition, in theory= we can even construct a end to end SR path/tunnel without SRH, but it sti= ll meet TE requirement. So my question is whether the flex-algo can be used= as tool to reduce SRH size? Cheers ! WANG Weibin --_000_MW3PR11MB4570B9F5FE3774B0475B6EF6C1A30MW3PR11MB4570namp_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Hi Wang,<= o:p>

&nbs= p;

You are c= orrect. Though I wouldn’t call it a goal but rather a benefit/advanta= ge – same applies to SR-MPLS where the label stack can be reduced.

&nbs= p;

Thanks,

Ketan

&nbs= p;

From: Lsr <lsr-bounces@ietf.org> On Behalf Of Wang, Weibin (NSB - CN/Shanghai)
Sent: 08 May 2020 19:07
To: lsr@ietf.org
Subject: [Lsr] draft-ietf-lsr-flex-algo

 

Hi authors:

 

After reading through this draf= t lsr-flex-algo, I want to know whether there is a potential goal of this d= raft to reduce the SRH size with enabling flex-algo with admin group in SRv= 6 deployment, because without flex-algo we have to have a big SRH size when the SRH include more SRv6 SIDs, if we = enable flex-algo under special topology and link constraint condition, in t= heory we can even construct  a end to end SR path/tunnel without SRH, = but it still meet TE requirement. So my question is whether the flex-algo can be used as tool to reduce SRH siz= e?

 

 

 

Cheers !<= /o:p>

 

WANG Weibin

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charset="gb2312" Content-Transfer-Encoding: quoted-printable

Ketan, thank you for clarification.

 

 

 

Cheers!

 

Wang Weibin

 

From: Ketan Talaulikar (ketant) <ketant@ci= sco.com>
Sent: 2020=C4=EA5=D4=C29=C8=D5 14:52
To: Wang, Weibin (NSB - CN/Shanghai) <weibin.wang@nokia-sbell.com= >; lsr@ietf.org
Subject: RE: draft-ietf-lsr-flex-algo

 

Hi Wang,

 

You are correct. Though I wouldn=A1=AFt call it a goal but rather a b= enefit/advantage =A8C same applies to SR-MPLS where the label stack can be = reduced.

 

Thanks,

Ketan

 

From: Lsr <lsr-bounces@ietf.org> On Behalf Of Wang, Weibin (NSB - CN/Shanghai)
Sent: 08 May 2020 19:07
To: lsr@ietf.org
Subject: [Lsr] draft-ietf-lsr-flex-algo

 

Hi authors:

 

After reading through this draft lsr-flex-algo, I wa= nt to know whether there is a potential goal of this draft to reduce the SR= H size with enabling flex-algo with admin group in SRv6 deployment, because= without flex-algo we have to have a big SRH size when the SRH include more SRv6 SIDs, if we enable flex-algo= under special topology and link constraint condition, in theory we can eve= n construct  a end to end SR path/tunnel without SRH, but it still mee= t TE requirement. So my question is whether the flex-algo can be used as tool to reduce SRH size?

 

 

 

Cheers !

 

WANG Weibin

--_000_28938a998b384038b6dd513db00072cfnokiasbellcom_-- From nobody Sat May 9 10:18:49 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id EC8163A0CF8 for ; Sat, 9 May 2020 10:18:43 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.499 X-Spam-Level: X-Spam-Status: No, score=-1.499 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FORGED_FROMDOMAIN=0.25, FREEMAIL_FROM=0.001, HEADER_FROM_DIFFERENT_DOMAINS=0.249, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001] autolearn=no autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 3OrrhDaS5kuP for ; Sat, 9 May 2020 10:18:37 -0700 (PDT) Received: from mail-pf1-x434.google.com (mail-pf1-x434.google.com [IPv6:2607:f8b0:4864:20::434]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id E62DE3A0C7F for ; Sat, 9 May 2020 10:18:31 -0700 (PDT) Received: by mail-pf1-x434.google.com with SMTP id 145so2598162pfw.13 for ; Sat, 09 May 2020 10:18:31 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=sender:from:message-id:mime-version:subject:date:in-reply-to:cc:to :references; bh=6SKK+lJ870gqkApQ2xKx/LqWcr03+zEUVdWSke5i8tE=; b=GOruR+saiAAtrPuwaJoLF+er08PUbxuUdRvXWHleB3zXXv9khnPw+/z0Id83LEL6af lGRWyCkxKud+pXbaDKmOtxvC5sfAlzqaHAh8bEN9MHeB6fpjRfcW3IFeoxcnaS2XpKd/ 6JV3yud+wyeUK+Alri5LX8Ts/vgq/VjMvCYu+nJeQ1KhSCH0sh3Fa+NXgiNti4Zf7L5V 6fMJ2QqwONMAoMhVPUdQnb1g+mtwQgvMtaQPdqeUTex0npqI6Yy0PnZOG5hWhnDOms1a xRJ8ITQDMdQ+SRBg58UvRs1Y2/hr3N6U79TjQXsdL/gqLoJzKTSbZ81fcNBLGkXithyl moKg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:from:message-id:mime-version:subject:date :in-reply-to:cc:to:references; bh=6SKK+lJ870gqkApQ2xKx/LqWcr03+zEUVdWSke5i8tE=; b=uMYS97eM6Qh/o/gzv9pEgyKHy0vqCLsxw5Xg5uK8m7o6Hb/QVewy65a+14A9i2Qhri u2JGQ9PEB2emQpilamW71gNsPI2mMfYOvI9sHCQ3XIA4NIZdzXxy3SLMTe6AjBdAle/Y UWrqd6NykXioCRCj5KgvG+O5w07c+eVkWevV1dR6QijK248h1OQ3RIkYAaaP9MqTRPRV XVzsl9zZtsa8ZFpVnvDwPEXm2v45DEsH/bxQZ6fk0yEoHkW9VtA/slQNtf/6JdFxBwvE 6qz2I9t/76h8CASkgYp/GbDxiTYHRs4Lx9RX2zLJbqSnoGGp0Qd+w340tESmyeg6ajCb wUOA== X-Gm-Message-State: AGi0PubT56qDtG0KJtfzWeXaigErmxxjG/lwezQoJ5nvCSaITleqClfk 3hpH6AvTkR/3DnygdiYcg/M= X-Google-Smtp-Source: APiQypKGhPPcJoFf3LJMpX8u5LuJ5ZZV0ColNdotxZH/3lFOu4GbEStlufqsf4wRJ+HE3+7Nz1sQ7w== X-Received: by 2002:a63:1e22:: with SMTP id e34mr7646041pge.427.1589044711119; Sat, 09 May 2020 10:18:31 -0700 (PDT) Received: from [10.95.85.165] ([162.210.129.5]) by smtp.gmail.com with ESMTPSA id kr1sm2134840pjb.26.2020.05.09.10.18.29 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Sat, 09 May 2020 10:18:30 -0700 (PDT) Sender: Tony Li From: tony.li@tony.li Message-Id: <15BFEDE9-5FCB-4FF2-A373-96231AECE607@tony.li> Content-Type: multipart/alternative; boundary="Apple-Mail=_DDED3C64-31DE-4448-A9AF-607BE84B70C3" Mime-Version: 1.0 (Mac OS X Mail 13.4 \(3608.80.23.2.2\)) Date: Sat, 9 May 2020 10:18:28 -0700 In-Reply-To: <28604621f41f45a5a6b870413c4318e0@huawei.com> Cc: "sarahchen@arista.com" , "lsr@ietf.org" To: "Gengxuesong (Geng Xuesong)" References: <28604621f41f45a5a6b870413c4318e0@huawei.com> X-Mailer: Apple Mail (2.3608.80.23.2.2) Archived-At: Subject: Re: [Lsr] Questions about draft-ietf-lsr-dynamic-flooding-04 X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 09 May 2020 17:18:46 -0000 --Apple-Mail=_DDED3C64-31DE-4448-A9AF-607BE84B70C3 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=utf-8 Hi Xuesong, > Thank you for your work about Flooding Reduction mechanism. I think it = is very useful for IGP scalability. Thank you, we very much appreciate that. > When Sarah giving presentation for = draft-chen-lsr-dynamic-flooding-algorithm-00 in LSR interim meeting, I = raised a question about how to handle multipoint failure in the flooding = topology. I remembered that draft-ietf-lsr-dynamic-flooding-04 was = mentioned. I have read this draft, especially section 6.8.11 and = temporary flooding relevant content. I think it is a valid method = logically. (We have tried to raise some examples to challenge this = method, but in all these cases, this method works) Considering that = reliability of IGP is crucial for deployment, we are still wondering = whether some mathematical proof is necessary (or possible) to guarantee = that, in all the possible scenarios, proper convergence could be = achieved when using flooding reduction algorithm, just as traditional = IGP mechanism. The proof may be case by case depending on the flooding = reduction algorithm, but we think even some example or clue about how to = do this will be very helpful. A proof? Ok, I can try to be rigorous, but it=E2=80=99s been a very long = time. I apologize in advance to Kireeti, Mr. Myers, Mr. Douglas, and = Prof. Greever for what follows. Definition: Let G=3D(V, E) be a finite graph. F=3D(V, E=E2=80=99) is a = =E2=80=98flooding topology=E2=80=99 on G if E=E2=80=99 is a subset of E = and F is connected. We normally have other properties for flooding topologies, such as being = bi-connected, relatively sparse, minimal diameter, and minimal degree, = but those properties are not relevant for this proof. Definition: Let C=3D(V*, E*), V* a subset of V, E* a subset of E, be the = =E2=80=98cut=E2=80=99 of G. This represents the failures in the = topology. Let G=E2=80=99 =3D G - C, the topology after failure, and let = F=E2=80=99 =3D F - C, be the flooding topology after failure.=20 Definition: Let R =3D E - E* - E=E2=80=99. This is the set of 'recovery = edges': edges that have not failed and are not part of the flooding = topology. Corollary: R is finite.=20 Proof: G is finite, by definition. Therefore E is finite, E* must be = finite, and E=E2=80=99 is finite. Lemma 1: If G=E2=80=99 is connected, then F=E2=80=99 + R is connected. Proof:=20 G=E2=80=99 =3D G - C =3D (V, E) - (V*, E*) =3D (V - V*, E - E*). =20 F=E2=80=99 + R =3D (F - C) + (E - E* - E=E2=80=99) =3D (V, E=E2=80=99) - = (V*, E*) + (E - E* - E=E2=80=99) =3D ( V - V*, E=E2=80=99 - E* ) + ( E - = E* - E=E2=80=99) =3D ( V - V*, E=E2=80=99 - E* + E - E* - E=E2=80=99 ) =3D= ( V - V*, E - E* - E* ) =3D ( V - V*, E - E* ) =3D G=E2=80=99. Q.E.D. Lemma 2: If G=E2=80=99 is connected, then incrementally adding edges = from R to F=E2=80=99 will yield a connected flooding topology. Proof: By induction. Let R=E2=80=99 be a subset of R. Induction = property: Either F' + R=E2=80=99 is connected, or R=E2=80=99 is a proper = subset of R. Base case: R=E2=80=99 is the empty set. If F=E2=80=99 is connected, then = F=E2=80=99 + R=E2=80=99 is connected and the property is satisfied. If = F=E2=80=99 + R=E2=80=99 is not connected, R=E2=80=99 is empty, which is = a proper subset of R. Induction case: Let r be a recovery edge in R - R=E2=80=99 (i.e., a new = edge to add). If F=E2=80=99 + R=E2=80=99 is connected, then the = property is satisfied already. If F=E2=80=99 + R=E2=80=99 + r is = connected, the property is satisfied. If R=E2=80=99 + r =3D R, then by = Lemma 1, the property is satisfied. Otherwise, R=E2=80=99 + r !=3D R, = and the property is satisfied. By our corollary, the induction must = terminate. Q.E.D. Bugs, questions, and comments are welcome. Regards, Tony --Apple-Mail=_DDED3C64-31DE-4448-A9AF-607BE84B70C3 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=utf-8

Hi Xuesong,


Thank you for = your work about Flooding Reduction mechanism. I think it is very useful = for IGP scalability.


Thank you, we very much = appreciate that.


When Sarah giving presentation for = draft-chen-lsr-dynamic-flooding-algorithm-00 in LSR interim meeting, I = raised a question about how to handle multipoint failure in the flooding = topology. I remembered that draft-ietf-lsr-dynamic-flooding-04 was = mentioned. I have read this draft, especially section 6.8.11 and = temporary flooding relevant content. I think it is a valid method = logically. (We have tried to raise some examples to challenge this = method, but in all these cases, this method works) Considering that = reliability of IGP is crucial for deployment, we are still wondering = whether some mathematical proof is necessary (or possible) to guarantee = that, in all the possible scenarios, proper convergence could be = achieved when using flooding reduction algorithm, just as traditional = IGP mechanism. The proof may be case by case depending on the flooding = reduction algorithm, but we think even some example or clue about how to = do this will be very helpful.


A proof? Ok, I can try = to be rigorous, but it=E2=80=99s been a very long time. I apologize in = advance to Kireeti, Mr. Myers, Mr. Douglas, and Prof. Greever for what = follows.


Definition: Let G=3D(V, E) be a finite graph. = F=3D(V, E=E2=80=99) is a =E2=80=98flooding topology=E2=80=99 on G if = E=E2=80=99 is a subset of E and F is connected.


We normally have other = properties for flooding topologies, such as being bi-connected, = relatively sparse, minimal diameter, and minimal degree, but those = properties are not relevant for this proof.


Definition: Let C=3D(V*, = E*), V* a subset of V, E* a subset of E, be the =E2=80=98cut=E2=80=99 of = G. This represents the failures in the topology. Let G=E2=80=99 =3D G - = C, the topology after failure, and let F=E2=80=99 =3D F - C, be the = flooding topology after failure. 


Definition: Let R =3D E = - E* - E=E2=80=99. This is the set of 'recovery edges': edges that have = not failed and are not part of the flooding topology.


Corollary: R is finite. 

Proof: G is finite, by definition. = Therefore E is finite, E* must be finite, and E=E2=80=99 is = finite.


Lemma 1: If G=E2=80=99 is connected, = then F=E2=80=99 + R is connected.

Proof: 

G=E2=80=99 =3D G - C =3D (V, E) - (V*, = E*) =3D (V - V*, E - E*).  

F=E2=80=99 + R =3D (F - C) + (E - E* - = E=E2=80=99) =3D (V, E=E2=80=99) - (V*, E*) + (E - E* - E=E2=80=99) =3D ( = V - V*, E=E2=80=99 - E* ) + ( E - E* - E=E2=80=99) =3D ( V - V*, E=E2=80=99= - E* + E - E* - E=E2=80=99 ) =3D ( V - V*, E - E* - E* ) =3D ( V - V*, = E - E* ) =3D G=E2=80=99.

Q.E.D.


Lemma 2: If G=E2=80=99 = is connected, then incrementally adding edges from R to F=E2=80=99 will = yield a connected flooding topology.

Proof: By induction. Let R=E2=80=99 be = a subset of R. Induction property: Either F' + R=E2=80=99 is connected, = or R=E2=80=99 is a proper subset of R.

Base case: R=E2=80=99 is the empty set. = If F=E2=80=99 is connected, then F=E2=80=99 + R=E2=80=99 is connected = and the property is satisfied. If F=E2=80=99 + R=E2=80=99 is not = connected, R=E2=80=99 is empty, which is a proper subset of R.

Induction case: Let r be = a recovery edge in R - R=E2=80=99 (i.e., a new edge to add).  If = F=E2=80=99 + R=E2=80=99 is connected, then the property is satisfied = already. If F=E2=80=99 + R=E2=80=99 + r is connected, the property is = satisfied. If R=E2=80=99 + r =3D R, then by Lemma 1, the property is = satisfied. Otherwise, R=E2=80=99 + r !=3D R, and the property is = satisfied. By our corollary, the induction must terminate.

Q.E.D.



Bugs, questions, and = comments are welcome.

Regards,
Tony

= --Apple-Mail=_DDED3C64-31DE-4448-A9AF-607BE84B70C3-- From nobody Sat May 9 12:23:41 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 9D7883A0F8C for ; Sat, 9 May 2020 12:23:39 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.096 X-Spam-Level: X-Spam-Status: No, score=-2.096 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, MIME_QP_LONG_LINE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 1Yr83XXHFGKg for ; Sat, 9 May 2020 12:23:36 -0700 (PDT) Received: from mail-pf1-x431.google.com (mail-pf1-x431.google.com [IPv6:2607:f8b0:4864:20::431]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 74CDE3A0F8B for ; Sat, 9 May 2020 12:23:36 -0700 (PDT) Received: by mail-pf1-x431.google.com with SMTP id r14so2717493pfg.2 for ; Sat, 09 May 2020 12:23:36 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=content-transfer-encoding:from:mime-version:subject:date:message-id :references:cc:in-reply-to:to; bh=KjDxkdp0IZIQlIImgvf0reaOoyTerh7p5mDX/urjlaA=; b=E56eS555kGfsgc6jicgEZ9YZHjtC1zk9lOuzi6DiLQPksE0s/wC9tEg7pHePLSHKKo lyTzUOS2zz7zTuDqt7soUmkNDFulELmhnItT+G5hNXvTAXu7VsXXbxqMoTKPPR0YObqV tqgChMTy8m+/RCcbvwVjIflj4ICTZVGW245YHQTY4LvAqYP4r2vHp8QG5oYPmfObtqXg BQ3p8zWWWZcUvJsYzKTV9q478j95mgpk0FUFiS1Hg0d51IV1vBOO4//j3b0MIjA1/tzx QZnV34eFaY1pCqtoWqJfcuA2dZi6HhFzkqCiNhqH4sjucVNVwGNoU/4toghpVFM22eN0 b7kA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:content-transfer-encoding:from:mime-version :subject:date:message-id:references:cc:in-reply-to:to; bh=KjDxkdp0IZIQlIImgvf0reaOoyTerh7p5mDX/urjlaA=; b=Cm0xRe3lhlvK/GJG5U+28fX+mgzZY8v2C4vyomBVm9L8LgVwiVg/kjJWRDJL+Ba89z dr0a4SMj05HguhTgwbxI/9Fd7ZgCNko6Sle/Ww4htSDZEcU3yT/C6QZWSxRkyFDSzq+Q B0a7JXjMkB6YdbbvxsnzSwVeMPYLLEQjlBGfgPAIlGGKqjQMfyHAHOqNx2TYGkwr1LOp 58HYFC36l0fF03pJAOyBgQuM0jqM09yX/tFof6PqER7tkcxRJd+SnSo4lUtrm7mRnN55 t1qYlaH6s+SmjWTMZToWCYSOn7BCvpZVkQdRPJ/TyLCtzJQ+9H7oLR/Kf4wdXkavhAda H21A== X-Gm-Message-State: AGi0PuZIQLWzpcNZl08t+xvs14FEPn9aMKnEpM9/gz6Z4sJ6taWeea3f Uo1VqMUnRPspPef6AyhoeQU= X-Google-Smtp-Source: APiQypIyh0kaksQwdE/xaYLpQAOAqk7Jy2pI0v0ycSy4I8rrDwuGXzvOO18k7JRv5s8V3kW3UnIE3w== X-Received: by 2002:a65:4d48:: with SMTP id j8mr2661125pgt.155.1589052215918; Sat, 09 May 2020 12:23:35 -0700 (PDT) Received: from [192.168.1.10] (c-73-63-232-212.hsd1.ca.comcast.net. [73.63.232.212]) by smtp.gmail.com with ESMTPSA id o63sm5523907pjb.40.2020.05.09.12.23.34 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sat, 09 May 2020 12:23:35 -0700 (PDT) Content-Type: multipart/alternative; boundary=Apple-Mail-9E93F7E1-6E6D-4F2F-896A-C2DA8D5DF079 Content-Transfer-Encoding: 7bit From: Jeff Tantsura Mime-Version: 1.0 (1.0) Date: Sat, 9 May 2020 12:23:33 -0700 Message-Id: <48FED425-3613-42BD-9892-4CD6786EF1BB@gmail.com> References: <28938a998b384038b6dd513db00072cf@nokia-sbell.com> Cc: "Ketan Talaulikar (ketant)" , "lsr@ietf.org" In-Reply-To: <28938a998b384038b6dd513db00072cf@nokia-sbell.com> To: "Wang, Weibin (NSB - CN/Shanghai)" X-Mailer: iPhone Mail (17E262) Archived-At: Subject: Re: [Lsr] draft-ietf-lsr-flex-algo X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 09 May 2020 19:23:40 -0000 --Apple-Mail-9E93F7E1-6E6D-4F2F-896A-C2DA8D5DF079 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Weibin, One could have an algo with MSD/ERLD as optimizations constrains, would be q= uite similar to colored links. Note - ERLD has implemented node capabilities= only, so all links on a node will have to be pruned. The tradeoffs are - having centralized controller with global view computing= a path that meets the constraints(classical BGP-LS + PCEP scenario) vs buil= ding a dynamic topology of connected nodes that meet a set of constrains, in= first case, change in topology/capabilities would cause path recalculation/= reoptimization on the PCE while in the second - IGP would recompute the topo= logy locally. Regards, Jeff > On May 9, 2020, at 01:27, Wang, Weibin (NSB - CN/Shanghai) wrote: >=20 > =EF=BB=BF > Ketan, thank you for clarification. > =20 > =20 > =20 > Cheers! > =20 > Wang Weibin > =20 > From: Ketan Talaulikar (ketant) =20 > Sent: 2020=E5=B9=B45=E6=9C=889=E6=97=A5 14:52 > To: Wang, Weibin (NSB - CN/Shanghai) ; lsr@ie= tf.org > Subject: RE: draft-ietf-lsr-flex-algo > =20 > Hi Wang, > =20 > You are correct. Though I wouldn=E2=80=99t call it a goal but rather a ben= efit/advantage =E2=80=93 same applies to SR-MPLS where the label stack can b= e reduced. > =20 > Thanks, > Ketan > =20 > From: Lsr On Behalf Of Wang, Weibin (NSB - CN/Shang= hai) > Sent: 08 May 2020 19:07 > To: lsr@ietf.org > Subject: [Lsr] draft-ietf-lsr-flex-algo > =20 > Hi authors: > =20 > After reading through this draft lsr-flex-algo, I want to know whether the= re is a potential goal of this draft to reduce the SRH size with enabling fl= ex-algo with admin group in SRv6 deployment, because without flex-algo we ha= ve to have a big SRH size when the SRH include more SRv6 SIDs, if we enable f= lex-algo under special topology and link constraint condition, in theory we c= an even construct a end to end SR path/tunnel without SRH, but it still mee= t TE requirement. So my question is whether the flex-algo can be used as too= l to reduce SRH size? > =20 > =20 > =20 > Cheers ! > =20 > WANG Weibin > _______________________________________________ > Lsr mailing list > Lsr@ietf.org > https://www.ietf.org/mailman/listinfo/lsr --Apple-Mail-9E93F7E1-6E6D-4F2F-896A-C2DA8D5DF079 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable Weibin,

One could have a= n algo with MSD/ERLD as optimizations constrains, would be quite similar to c= olored links. Note - ERLD has implemented node capabilities only, so all lin= ks on a node will have to be pruned.
The tradeoffs are - having ce= ntralized controller with global view computing a path that meets the constr= aints(classical BGP-LS + PCEP scenario) vs building a dynamic topology of co= nnected nodes that meet a set of constrains, in first case, change in topolo= gy/capabilities would cause path recalculation/reoptimization on the PCE whi= le in the second - IGP would recompute the topology locally.

<= div dir=3D"ltr">Regards,
Jeff

On May 9, 2020, at 01:27, Wang, Weibin (NSB - CN/Shanghai) &= lt;weibin.wang@nokia-sbell.com> wrote:

=EF=BB=BF

Ketan, thank you for clarification.

 

 

 

Cheers!

 

Wang Weibin

 

From: Ketan Talaulikar (ketant) <ketant@cis= co.com>
Sent: 2020=E5=B9=B45=E6=9C=889=E6=97=A5 14:5= 2
To: Wang, Weibin (NSB - CN/Shanghai) <weibin.wang@nokia-sbell.com&= gt;; lsr@ietf.org
Subject: RE: draft-ietf-lsr-flex-algo

 

Hi Wang,

 

You are correct. Though I wouldn=E2=80=99t call it a goal but rather a b= enefit/advantage =E2=80=93 same applies to SR-MPLS where the label stack can= be reduced.

 

Thanks,

Ketan

 

From: Lsr <lsr-bounces@ietf.org> On Behalf Of Wang, Weibin (NSB - CN/Shanghai)
Sent: 08 May 2020 19:07
To: lsr@ietf.org
Subject: [Lsr] draft-ietf-lsr-flex-algo

 

Hi authors:

 

After reading through this draft lsr-flex-algo, I wan= t to know whether there is a potential goal of this draft to reduce the SRH s= ize with enabling flex-algo with admin group in SRv6 deployment, because wit= hout flex-algo we have to have a big SRH size when the SRH include more SRv6 SIDs, if we enable flex-algo u= nder special topology and link constraint condition, in theory we can even c= onstruct  a end to end SR path/tunnel without SRH, but it still meet TE= requirement. So my question is whether the flex-algo can be used as tool to reduce SRH size?

 

 

 

Cheers !

 

WANG Weibin

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Thread-Topic: [Lsr] draft-ietf-lsr-flex-algo Thread-Index: AdYlOXl7J26ZJEOiSNe/050l75qS7gAlJoJwAANVJ7AABjd1gAAdD9dw Date: Sun, 10 May 2020 01:25:02 +0000 Message-ID: References: <28938a998b384038b6dd513db00072cf@nokia-sbell.com> <48FED425-3613-42BD-9892-4CD6786EF1BB@gmail.com> In-Reply-To: <48FED425-3613-42BD-9892-4CD6786EF1BB@gmail.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [135.251.51.115] Content-Type: multipart/alternative; boundary="_000_c142498d599848878eda62eae76ea3e9nokiasbellcom_" MIME-Version: 1.0 X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFlrEIsWRmVeSWpSXmKPExsXS/ts4R/d9+PY4g10r9Sxedfxksni49wGL xYknK1gdmD2m/N7I6rFz1l12jyVLfjIFMEdx2aSk5mSWpRbp2yVwZWw7tpy5oKmBseLbn2fM DYynaroYOTkkBEwkNnz8ztTFyMUhJHCISaJjRQczhPOXUeLHs9nsEM4mRok3056zgrSwCbhJ TNq2i62LkYNDREBbYt95SZAws0CwxP0pF1lBwsJA4U/HvEHCIgI6Etd/9TJD2G4SJ9qms4PY LAKqEseO/gebyCtgJ7F43nkmEFtIoFDi+Z97bCA2p4CtxOspW8B6GQXEJL6fWsMEsUpc4taT 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charset="utf-8" Content-Transfer-Encoding: 8bit From: =?utf-8?q?=C3=89ric_Vyncke_via_Datatracker?= To: "The IESG" Cc: draft-ietf-ospf-mpls-elc@ietf.org, lsr-chairs@ietf.org, lsr@ietf.org, Acee Lindem , aretana.ietf@gmail.com, acee@cisco.com X-Test-IDTracker: no X-IETF-IDTracker: 6.129.1 Auto-Submitted: auto-generated Precedence: bulk Reply-To: =?utf-8?q?=C3=89ric_Vyncke?= Message-ID: <158921254839.9500.17457680660479110887@ietfa.amsl.com> Date: Mon, 11 May 2020 08:55:48 -0700 Archived-At: Subject: [Lsr] =?utf-8?q?=C3=89ric_Vyncke=27s_No_Objection_on_draft-ietf-?= =?utf-8?q?ospf-mpls-elc-13=3A_=28with_COMMENT=29?= X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 11 May 2020 15:55:49 -0000 Éric Vyncke has entered the following ballot position for draft-ietf-ospf-mpls-elc-13: No Objection When responding, please keep the subject line intact and reply to all email addresses included in the To and CC lines. (Feel free to cut this introductory paragraph, however.) Please refer to https://www.ietf.org/iesg/statement/discuss-criteria.html for more information about IESG DISCUSS and COMMENT positions. The document, along with other ballot positions, can be found here: https://datatracker.ietf.org/doc/draft-ietf-ospf-mpls-elc/ ---------------------------------------------------------------------- COMMENT: ---------------------------------------------------------------------- Thank you for the work put into this document. The document is easy to read. Please find below one non-blocking COMMENTs and two NITs. I hope that this helps to improve the document, Regards, -éric == COMMENT == For my own curiosity, is there a possibility that a router receives conflicting node capability via OSPFv2 and OSPFv3 (assuming that both are running over the same network and using the same router-ID over OSPFv2 and OSPFv3) ? == NITS == -- section 4 -- The "one" is ambiguous in "the router MUST advertise the smallest one." even if we can guess that it is not "interface" ;-) -- Sections 3 & 4 -- Is there a meaningful difference between the "advertizing" of section 3 and the "signaling" of section 4? From nobody Mon May 11 09:03:21 2020 Return-Path: X-Original-To: lsr@ietf.org Delivered-To: lsr@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id CC25A3A0985; Mon, 11 May 2020 09:02:26 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit From: =?utf-8?q?=C3=89ric_Vyncke_via_Datatracker?= To: "The IESG" Cc: draft-ietf-isis-mpls-elc@ietf.org, lsr-chairs@ietf.org, lsr@ietf.org, Acee Lindem , aretana.ietf@gmail.com, acee@cisco.com X-Test-IDTracker: no X-IETF-IDTracker: 6.129.1 Auto-Submitted: auto-generated Precedence: bulk Reply-To: =?utf-8?q?=C3=89ric_Vyncke?= Message-ID: <158921293906.13134.17968677360806711623@ietfa.amsl.com> Date: Mon, 11 May 2020 09:02:25 -0700 Archived-At: Subject: [Lsr] =?utf-8?q?=C3=89ric_Vyncke=27s_No_Objection_on_draft-ietf-?= =?utf-8?q?isis-mpls-elc-12=3A_=28with_COMMENT=29?= X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 11 May 2020 16:02:33 -0000 Éric Vyncke has entered the following ballot position for draft-ietf-isis-mpls-elc-12: No Objection When responding, please keep the subject line intact and reply to all email addresses included in the To and CC lines. (Feel free to cut this introductory paragraph, however.) Please refer to https://www.ietf.org/iesg/statement/discuss-criteria.html for more information about IESG DISCUSS and COMMENT positions. The document, along with other ballot positions, can be found here: https://datatracker.ietf.org/doc/draft-ietf-isis-mpls-elc/ ---------------------------------------------------------------------- COMMENT: ---------------------------------------------------------------------- Thank you for the work put into this document. The document is easy to read. Like other ADs, I wonder why the IS-IS and OSPF are separate documents. Please find below one NIT. I hope that this helps to improve the document, Regards, -éric == NIT == -- section 4 -- The "one" is ambiguous in "the router MUST advertise the smallest one." even if we can guess that it is not "interface" ;-) From nobody Mon May 11 10:10:32 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 821063A0B08 for ; Mon, 11 May 2020 10:03:30 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.499 X-Spam-Level: X-Spam-Status: No, score=-1.499 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FORGED_FROMDOMAIN=0.25, FREEMAIL_FROM=0.001, HEADER_FROM_DIFFERENT_DOMAINS=0.249, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001] autolearn=no autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id fRg-zlidka5d for ; Mon, 11 May 2020 10:03:24 -0700 (PDT) Received: from mail-pf1-x432.google.com (mail-pf1-x432.google.com [IPv6:2607:f8b0:4864:20::432]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 2EB2E3A0A8B for ; Mon, 11 May 2020 10:03:19 -0700 (PDT) Received: by mail-pf1-x432.google.com with SMTP id 145so4994540pfw.13 for ; Mon, 11 May 2020 10:03:19 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=sender:from:message-id:mime-version:subject:date:in-reply-to:cc:to :references; bh=CZDGZ6duRIKsx1Yv99ALabJPXmblXJNBrrN0K0V8yAU=; b=qIGHJmwG7EiAWsOQtsff2ZmPG+bc10k7nllVbU75U5lwI8HZafRL+G05S5wLgoSjk7 IvAHLB65EhZBS+W3FlGHI3v4+rZIRR1dN5S/7kU3tvBXOekfed1mblKLitNlSdk3qwuK nSXPeyzYSIZkwnVuCnUicVciO160UvT85Nim9XoM8ub0NAzLW5mvA0Y+ZTACUtyP7Xlr UxhmYRydh6tLzX336T6i7iJ5/eKcMLQsX++DSHHwkZGvV2tRAgL9u6waWht2rtayVHxQ 3jhdhIE/7RWdc3Jv6YS0ZMve6HA9ZwwK3912XZl8JHv1J8L0/qynM4Z6f+9w1bHRDaXQ 6G5w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:from:message-id:mime-version:subject:date :in-reply-to:cc:to:references; bh=CZDGZ6duRIKsx1Yv99ALabJPXmblXJNBrrN0K0V8yAU=; b=ZLj9Aw6CtnW1vpLt/2WDz8FuVgL1V4f1TYyLnFQZNX/cqZJpwMsGJw1kU3v4HQuYix k/NJ8lPxh/Ow/Yxqzb6n7/Zi9lf2LoWEHm/deGUQkFwlP1p8GVYDgrQ1bmvXFv9MrCO8 okgBr/SVl6d/o704DXYTEr7SYabBucll+ZLPEATPbfuvJHgBllqWwJa+2SMStZEIn8wm BPugJUqhMxp1OTjKA45MaEVsSzmo/zhyVXC1o1m+1ceweDEl2720sjpIHbKmBBmU0XRV 5Ii8KrgdswWmwvQoKF5k23Syal903c3roEpi+rU3nxtIPANNS0RsVx+KYjmCeHwnSWff WGAw== X-Gm-Message-State: AGi0Puau/LCll0ehHM4eARCvKfpCRtv3pwuTZvVVbrfdRxI8o4phbS/U KkVmR4tFbV1/2Cngx4WtnNk= X-Google-Smtp-Source: APiQypIV4y0/pR0iOtQ/AMZBO4KnNPYvkeB7ye1/0u7Fb6a9lvB2WWxiLvpIx9kjLK7x9TtdWBYSHA== X-Received: by 2002:a62:1d48:: with SMTP id d69mr16841933pfd.102.1589216598381; Mon, 11 May 2020 10:03:18 -0700 (PDT) Received: from [192.168.4.24] (c-67-169-103-239.hsd1.ca.comcast.net. [67.169.103.239]) by smtp.gmail.com with ESMTPSA id 140sm9816253pfw.96.2020.05.11.10.03.16 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Mon, 11 May 2020 10:03:17 -0700 (PDT) Sender: Tony Li From: tony.li@tony.li Message-Id: <4E9DA0B6-4867-48D5-ADF8-0E4500E067B7@tony.li> Content-Type: multipart/alternative; boundary="Apple-Mail=_EDBAA4F9-10B8-4492-961C-51270B59C4F5" Mime-Version: 1.0 (Mac OS X Mail 13.4 \(3608.80.23.2.2\)) Date: Mon, 11 May 2020 10:03:15 -0700 In-Reply-To: <5fae04a3f0c5429f84af69f3ba001abf@huawei.com> Cc: "sarahchen@arista.com" , "lsr@ietf.org" To: "Gengxuesong (Geng Xuesong)" References: <28604621f41f45a5a6b870413c4318e0@huawei.com> <15BFEDE9-5FCB-4FF2-A373-96231AECE607@tony.li> <5fae04a3f0c5429f84af69f3ba001abf@huawei.com> X-Mailer: Apple Mail (2.3608.80.23.2.2) Archived-At: Subject: Re: [Lsr] Questions about draft-ietf-lsr-dynamic-flooding-04 X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 11 May 2020 17:03:32 -0000 --Apple-Mail=_EDBAA4F9-10B8-4492-961C-51270B59C4F5 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=utf-8 Hi Xuesong, > Thank you for giving detailed proof, and it is very helpful to = understand the mechanism. > As I understand, it is showed in the proof that if there is proper = temporary flooding in R =3D E - E* - E=E2=80=99, same connectivity could = be achieved by the flooding topology F=E2=80=99 just as G=E2=80=99. I = agree with this. I=E2=80=99m glad it helped. > The problem for me now is how to enable the temporary flooding = properly. > Here is an example: > > The solid line presents the physical link inside flooding topology, = and the dashed line presents the physical link out of flooding topology. > =46rom the view of me, when multipoint failure happens, node 3 is = supposed to enable the temporary flooding between 3 and 4, in order to = connect with the nodes inside the red box, while the other dashed line = between node 1 and node nobody is not supposed to do temporary flooding = although node 1 is connected to the failed link directly. > It seems a little unclear for me about how the node itself could = decide whether a dashed line should do temporary flooding or not in this = case. The problem that you=E2=80=99re asking about is partition detection. To explain this, I=E2=80=99ve taken the liberty of adding some more = labels to your diagram. To start, each node has its link state database and the flooding = topology. Each node should receive link state updates from nodes in its = partition, but will not receive updates from other nodes, thus the link = state database is partially inconsistent and must be treated with care. For example, node 2 will see updates from nodes 1, 6, and 7, informing = it of the failure, but it will not receive an update from node 8. Now, the job of each node is try to compute the partitions of the = flooding topology. In particular, each node needs to understand which = nodes are in its partition. A node cannot know all of the partitions = that exist, but it turns out that that=E2=80=99s irrelevant. Once a node understands which nodes are in its partition, then it is a = simple matter to see which links should be enabled for temporary = flooding. If a neighbor is in the same partition (e.g., nodes 1 and 5), = then adding the link adds no value. If the neighbor is not in the same = partition (e.g., nodes 3 and 4), then it becomes a recovery link. The actual computation of the partitions is straightforward, with one = caveat: we always want to perform a two-way check for connectivity. An = implementation should be doing this during SPF already, so this should = be familiar. The reason for doing this is quite clear: in node 2=E2=80=99s= link state database (LSDB), the LSP for node 8 will show connectivity = to node 1 even after the failure. However, node 1=E2=80=99s LSP will = clearly show that the adjacency has failed. We can only infer = connectivity when we see both sides of the adjacency are up. Given this, the specific algorithm that you choose is an implementation = detail. You could do a breadth-first search or a depth-first search. = Our implementation chooses to walk the entire flooding topology, = building a tree of the partitions that it detects. [IPR note: we have a = IPR claim for this approach, with the =E2=80=9Cdon=E2=80=99t sue us, we = won=E2=80=99t sue you=E2=80=9D terms.] I hope this helps. Regards, Tony --Apple-Mail=_EDBAA4F9-10B8-4492-961C-51270B59C4F5 Content-Type: multipart/related; type="text/html"; boundary="Apple-Mail=_B0B5BC35-8A8F-48F7-9C1B-E6C681F8ABE1" --Apple-Mail=_B0B5BC35-8A8F-48F7-9C1B-E6C681F8ABE1 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=utf-8

Hi Xuesong,

Thank you for giving detailed proof, and = it is very helpful to understand the mechanism.
As I understand, it is = showed in the proof that if there is proper temporary flooding in R =3D = E - E* - E=E2=80=99, same connectivity could be achieved by the flooding = topology F=E2=80=99 just as G=E2=80=99. I agree with = this.


I=E2=80=99m glad it = helped.


The problem for me now is how to enable the temporary = flooding properly.
Here is an = example:
<image001.png>
The solid line presents = the physical link inside flooding topology, and the dashed line presents = the physical link out of flooding topology.
=46rom the view of me, = when multipoint failure happens, node 3 is supposed to enable the = temporary flooding between 3 and 4, in order to connect with the nodes = inside the red box, while the other dashed line between node 1 and node = nobody is not supposed to do temporary flooding although node 1 is = connected to the failed link directly.
It seems a little = unclear for me about how the node itself could decide whether a dashed = line should do temporary flooding or not in this case.


The = problem that you=E2=80=99re asking about is partition = detection.

To = explain this, I=E2=80=99ve taken the liberty of adding some more labels = to your diagram.

To start, each node has its link state database and the = flooding topology.  Each node should receive link state updates = from nodes in its partition, but will not receive updates from other = nodes, thus the link state database is partially inconsistent and must = be treated with care.

For example, node 2 will see updates from nodes 1, 6, and 7, = informing it of the failure, but it will not receive an update from node = 8.

Now, the = job of each node is try to compute the partitions of the flooding = topology.  In particular, each node needs to understand which nodes = are in its partition. A node cannot know all of the partitions that = exist, but it turns out that that=E2=80=99s irrelevant.

Once a node understands = which nodes are in its partition, then it is a simple matter to see = which links should be enabled for temporary flooding.  If a = neighbor is in the same partition (e.g., nodes 1 and 5), then adding the = link adds no value. If the neighbor is not in the same partition (e.g., = nodes 3 and 4), then it becomes a recovery link.

The actual computation of the = partitions is straightforward, with one caveat: we always want to = perform a two-way check for connectivity.  An implementation should = be doing this during SPF already, so this should be familiar. The reason = for doing this is quite clear: in node 2=E2=80=99s link state database = (LSDB), the LSP for node 8 will show connectivity to node 1 even after = the failure. However, node 1=E2=80=99s LSP will clearly show that the = adjacency has failed.  We can only infer connectivity when we see = both sides of the adjacency are up.

Given this, the specific algorithm that = you choose is an implementation detail.  You could do a = breadth-first search or a depth-first search. Our implementation chooses = to walk the entire flooding topology, building a tree of the partitions = that it detects. [IPR note: we have a IPR claim for this approach, with = the =E2=80=9Cdon=E2=80=99t sue us, we won=E2=80=99t sue you=E2=80=9D = terms.]

I hope = this helps.

Regards,
Tony


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AoqAtxBQp+ctJHU9ioAioAgoAn6PwP8HSsGF87Sy+F4AAAAASUVORK5CYII= --Apple-Mail=_B0B5BC35-8A8F-48F7-9C1B-E6C681F8ABE1-- --Apple-Mail=_EDBAA4F9-10B8-4492-961C-51270B59C4F5-- From nobody Mon May 11 10:15:57 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id E807C3A0B10; Mon, 11 May 2020 10:14:50 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -9.601 X-Spam-Level: X-Spam-Status: No, score=-9.601 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIMWL_WL_MED=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, SPF_PASS=-0.001, URIBL_BLOCKED=0.001, USER_IN_DEF_DKIM_WL=-7.5] autolearn=unavailable autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=cisco.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id smwhbB3Uy8W2; Mon, 11 May 2020 10:14:27 -0700 (PDT) Received: from aer-iport-1.cisco.com (aer-iport-1.cisco.com [173.38.203.51]) (using TLSv1.2 with cipher DHE-RSA-SEED-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 3B35B3A0AF4; Mon, 11 May 2020 10:14:17 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=1675; q=dns/txt; s=iport; t=1589217259; x=1590426859; h=subject:to:cc:references:from:message-id:date: mime-version:in-reply-to:content-transfer-encoding; bh=51J7XAhC7mq2K8mchm7K+VPPjRlntelHKnLPi3eHrBE=; b=IFjchGsoYTFK/+EFCs+UGqq+ix8eC8N0xc/Z8d+SzIXr/KfY89EWchM2 VM+7IhWq6m9t6jASji3m3zgVD33asxtrud894mu6SgRAMPaGLpv/oFouf +Vh8mopYme0/jqlY/8prXm9pI+njzgmI/eEiQp0JFMv2dz9PMvYhx++wQ M=; X-IronPort-AV: E=Sophos;i="5.73,380,1583193600"; d="scan'208";a="26086274" Received: from aer-iport-nat.cisco.com (HELO aer-core-3.cisco.com) ([173.38.203.22]) by aer-iport-1.cisco.com with ESMTP/TLS/DHE-RSA-SEED-SHA; 11 May 2020 17:14:15 +0000 Received: from [10.60.140.51] (ams-ppsenak-nitro2.cisco.com [10.60.140.51]) by aer-core-3.cisco.com (8.15.2/8.15.2) with ESMTP id 04BHEDtC006679; Mon, 11 May 2020 17:14:14 GMT To: =?UTF-8?Q?=c3=89ric_Vyncke?= , The IESG Cc: draft-ietf-isis-mpls-elc@ietf.org, lsr-chairs@ietf.org, lsr@ietf.org, Acee Lindem , aretana.ietf@gmail.com References: <158921293906.13134.17968677360806711623@ietfa.amsl.com> From: Peter Psenak Message-ID: <46956518-01cb-32e1-ec7f-cf196be7a0eb@cisco.com> Date: Mon, 11 May 2020 19:14:14 +0200 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:60.0) Gecko/20100101 Thunderbird/60.7.0 MIME-Version: 1.0 In-Reply-To: <158921293906.13134.17968677360806711623@ietfa.amsl.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit X-Outbound-SMTP-Client: 10.60.140.51, ams-ppsenak-nitro2.cisco.com X-Outbound-Node: aer-core-3.cisco.com Archived-At: Subject: Re: [Lsr] =?utf-8?q?=C3=89ric_Vyncke=27s_No_Objection_on_draft-ietf-?= =?utf-8?q?isis-mpls-elc-12=3A_=28with_COMMENT=29?= X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 11 May 2020 17:14:54 -0000 Hi Eric, please see inline: On 11/05/2020 18:02, Éric Vyncke via Datatracker wrote: > Éric Vyncke has entered the following ballot position for > draft-ietf-isis-mpls-elc-12: No Objection > > When responding, please keep the subject line intact and reply to all > email addresses included in the To and CC lines. (Feel free to cut this > introductory paragraph, however.) > > > Please refer to https://www.ietf.org/iesg/statement/discuss-criteria.html > for more information about IESG DISCUSS and COMMENT positions. > > > The document, along with other ballot positions, can be found here: > https://datatracker.ietf.org/doc/draft-ietf-isis-mpls-elc/ > > > > ---------------------------------------------------------------------- > COMMENT: > ---------------------------------------------------------------------- > > Thank you for the work put into this document. The document is easy to read. > > Like other ADs, I wonder why the IS-IS and OSPF are separate documents. Alvaro has responded to similar query from Barry Leiba. > > Please find below one NIT. > > I hope that this helps to improve the document, > > Regards, > > -éric > > == NIT == > > -- section 4 -- > The "one" is ambiguous in "the router MUST advertise the smallest one." even if > we can guess that it is not "interface" ;-) ok, what would you like to say instead "one"? Would this be better: If a router has multiple interfaces with different capabilities of reading the maximum label stack depth, the router MUST advertise the smallest value found across all of its interfaces. thanks, Peter > > > > > From nobody Mon May 11 10:22:27 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 4593C3A0B3E; Mon, 11 May 2020 10:20:33 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -9.601 X-Spam-Level: X-Spam-Status: No, score=-9.601 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIMWL_WL_MED=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, SPF_PASS=-0.001, URIBL_BLOCKED=0.001, USER_IN_DEF_DKIM_WL=-7.5] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=cisco.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 7Ci6CKLOXtKB; Mon, 11 May 2020 10:20:25 -0700 (PDT) Received: from aer-iport-4.cisco.com (aer-iport-4.cisco.com [173.38.203.54]) (using TLSv1.2 with cipher DHE-RSA-SEED-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 129533A0B39; Mon, 11 May 2020 10:19:54 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=2026; q=dns/txt; s=iport; t=1589217595; x=1590427195; h=subject:to:cc:references:from:message-id:date: mime-version:in-reply-to:content-transfer-encoding; bh=/1Saxnf2dX+5QYF6F0jYrHApRYaQ6rWBhPYv2TMLPnk=; b=WyDqN81kyOEQa72tJ4KCadLwJj3R229U3vlIVYzafWe5vbtlSNlwEJXH 8rbyjsthzFIUSmP00qQB4qOcG8rqkGGlpLtKihsfUWyr45uA0m1eFlgmu NvZY9O5ChwzKtQ4NJF627s58qLJzMnPSZmd70F6LPTPvPCZoBi1t3fcaa s=; X-IronPort-AV: E=Sophos;i="5.73,380,1583193600"; d="scan'208";a="26025962" Received: from aer-iport-nat.cisco.com (HELO aer-core-4.cisco.com) ([173.38.203.22]) by aer-iport-4.cisco.com with ESMTP/TLS/DHE-RSA-SEED-SHA; 11 May 2020 17:19:53 +0000 Received: from [10.60.140.51] (ams-ppsenak-nitro2.cisco.com [10.60.140.51]) by aer-core-4.cisco.com (8.15.2/8.15.2) with ESMTP id 04BHJqv8010708; Mon, 11 May 2020 17:19:52 GMT To: =?UTF-8?Q?=c3=89ric_Vyncke?= , The IESG Cc: draft-ietf-ospf-mpls-elc@ietf.org, lsr-chairs@ietf.org, lsr@ietf.org, Acee Lindem , aretana.ietf@gmail.com References: <158921254839.9500.17457680660479110887@ietfa.amsl.com> From: Peter Psenak Message-ID: Date: Mon, 11 May 2020 19:19:52 +0200 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:60.0) Gecko/20100101 Thunderbird/60.7.0 MIME-Version: 1.0 In-Reply-To: <158921254839.9500.17457680660479110887@ietfa.amsl.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit X-Outbound-SMTP-Client: 10.60.140.51, ams-ppsenak-nitro2.cisco.com X-Outbound-Node: aer-core-4.cisco.com Archived-At: Subject: Re: [Lsr] =?utf-8?q?=C3=89ric_Vyncke=27s_No_Objection_on_draft-ietf-?= =?utf-8?q?ospf-mpls-elc-13=3A_=28with_COMMENT=29?= X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 11 May 2020 17:20:35 -0000 Hi Eric, please see inline: On 11/05/2020 17:55, Éric Vyncke via Datatracker wrote: > Éric Vyncke has entered the following ballot position for > draft-ietf-ospf-mpls-elc-13: No Objection > > When responding, please keep the subject line intact and reply to all > email addresses included in the To and CC lines. (Feel free to cut this > introductory paragraph, however.) > > > Please refer to https://www.ietf.org/iesg/statement/discuss-criteria.html > for more information about IESG DISCUSS and COMMENT positions. > > > The document, along with other ballot positions, can be found here: > https://datatracker.ietf.org/doc/draft-ietf-ospf-mpls-elc/ > > > > ---------------------------------------------------------------------- > COMMENT: > ---------------------------------------------------------------------- > > Thank you for the work put into this document. The document is easy to read. > > Please find below one non-blocking COMMENTs and two NITs. > > I hope that this helps to improve the document, > > Regards, > > -éric > > == COMMENT == > > For my own curiosity, is there a possibility that a router receives conflicting > node capability via OSPFv2 and OSPFv3 (assuming that both are running over the > same network and using the same router-ID over OSPFv2 and OSPFv3) ? that would be a bug likely, as the capability is not specific to any of the protocol and they only act as messengers. But we can not mandate any cross protocols checking either. > > == NITS == > > -- section 4 -- > The "one" is ambiguous in "the router MUST advertise the smallest one." even if > we can guess that it is not "interface" ;-) > > -- Sections 3 & 4 -- > Is there a meaningful difference between the "advertizing" of section 3 and the > "signaling" of section 4? not really. In IGPs we tend to use "advertise" more. If you prefer, I can change all to "advertise" or to "signal" for consistency. thanks, Peter > > > > > From nobody Mon May 11 11:08:10 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id EAC593A0976; Mon, 11 May 2020 11:07:47 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.888 X-Spam-Level: X-Spam-Status: No, score=-1.888 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, SPF_HELO_NONE=0.001, T_SPF_PERMERROR=0.01, URIBL_BLOCKED=0.001] autolearn=unavailable autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id XSeY4NL4-PmZ; Mon, 11 May 2020 11:07:05 -0700 (PDT) Received: from b-painless.mh.aa.net.uk (b-painless.mh.aa.net.uk [IPv6:2001:8b0:0:30::52]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 8EF243A0028; Mon, 11 May 2020 10:59:00 -0700 (PDT) Received: from 3.d.a.7.1.3.1.2.1.0.1.4.e.8.9.b.1.0.0.0.f.b.0.0.0.b.8.0.1.0.0.2.ip6.arpa ([2001:8b0:bf:1:b98e:4101:2131:7ad3]) by b-painless.mh.aa.net.uk with esmtp (Exim 4.92) (envelope-from ) id 1jYCMw-0004DN-Sa; Mon, 11 May 2020 18:37:34 +0100 To: Peter Psenak , gen-art@ietf.org Cc: draft-ietf-ospf-mpls-elc.all@ietf.org, last-call@ietf.org, lsr@ietf.org References: <158877512992.25308.14489968716385236242@ietfa.amsl.com> <5f206fd3-8918-9c1f-e403-8591c54acf83@cisco.com> From: Elwyn Davies Message-ID: Date: Mon, 11 May 2020 18:37:04 +0100 User-Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:68.0) Gecko/20100101 Thunderbird/68.8.0 MIME-Version: 1.0 In-Reply-To: <5f206fd3-8918-9c1f-e403-8591c54acf83@cisco.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Content-Language: en-GB Archived-At: Subject: Re: [Lsr] Genart last call review of draft-ietf-ospf-mpls-elc-13 X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 11 May 2020 18:07:51 -0000 Hi, Peter. In the light of some of your responses here, I would just like to clarify that one of the reasons for gen-art reviews is to try and make extremely complicated technical documents more accessible for those who are not as deeply embedded in the jargon and technicalities of the subject as well as making sure that readers can quickly determine whether a document is relevant to work that they are doing. Please take this into account when considering your further actions. Note that the optionality of ERLD-MSD advertisements appears on reflection to be a more serious issue than just an editorial nit. Regards, Elwyn On 07/05/2020 08:53, Peter Psenak wrote: > Hi Elwyn, > > please see inline: > > On 06/05/2020 16:25, Elwyn Davies via Datatracker wrote: >> Reviewer: Elwyn Davies >> Review result: Ready with Nits >> >> I am the assigned Gen-ART reviewer for this draft. The General Area >> Review Team (Gen-ART) reviews all IETF documents being processed >> by the IESG for the IETF Chair.  Please treat these comments just >> like any other last call comments. >> >> For more information, please see the FAQ at >> >> . >> >> Document: draft-ietf-ospf-mpls-elc-13 >> Reviewer: Elwyn Davies >> Review Date: 2020-05-06 >> IETF LC End Date: 2020-05-05 >> IESG Telechat date: 2020-05-21 >> >> Summary: >> Ready with nits.  Aside:  I have to say that the convolutions and >> cross-referencing of doing the OSPF and IS-IS  extensions plus BGP-LS >> added to >> the cross-linking with MPLS is leading to mind-blowing complexity.  >> Sooner or >> later something is going to blow up here! >> >> Major issues: >> None >> >> Minor issues: >> None >> >> Nits/editorial comments: >> >> Abstract and title :  The application to BGP-LS (s5) is not mentioned >> in the >> abstract or the title.  Also the first use of BGP-LS needs to be >> expanded. > > Why would the BGP-LS need to be mentioned in the abstract? At present BGP-LS is the subject of a separate document and this document extends the BGP add-on called BGP-LS as well as OSPF v2 and v3.  It is therefor important that implementers of BGP-LS can easily find documents that are relevant to their work. > > I have expanded the first use of BGP-LS > >> >> Abstract: s/tunnel/LSP/ > > done > >> >> s1: Suggest s/SR-MPLS/Segment Routing with the MPLS Data Plane/ >> >> s1: Query:  As a non-expert in this area, I was wondering if the >> signalling >> capability is or will be implemented in IS-IS?  A brief comment on >> the status >> wrt IS-IS would be helpful.  [It turns out that you already reference >> the >> document that implements this later in this draft.] > > yes, it is being added to ISIS. Yes, this draft reference the ISIS > draft. I see no reason to to include ISIS draft status in this > document though. As has been mentioned in other reviews of this document and the corresponding IS-IS document, having two documents that cover this extension is not very desirable.  As a non-expert, but who knows that OSPF and IS-IS provide closely related functionality, one gets to this point in the document and wonders why OSPF and not IS-IS. If the WG does not bite the bullet and combine the drafts, it would be highly desirable to point out that the same functionality is being proposed for all three protocols > > >> >> s1, last sentence: s/it's/it is/ > > done > >> >> s3: It would be a good idea to expand 'prefix' to 'address prefix >> advertisement' on its first occurrence here.  Thereafter 'prefix' is >> fine by me. > > "prefix" is being used in almost all OSPF and ISIS document, we never > use address prefix. Really? Revisiting RFC 2328 (OSPFv2) we see that prefix is not used at all and in RFC 5340 (OSPF for IPv6)  the term prefix is introduced as 'IP address prefix'.  In order to make it clear of what this is a prefix, and what is going on here, expanding the initial usage is highly desirable. > > >> >> s3, para 3: Why would a router not advertise the ELC with all >> prefixes?  Can >> you say why this ought not to be a MUST. > > advertising ELC property with prefix advertisement is optional. We can > not mandate it. It would make all routers not advertising this data > violating this spec. Er, no.  Nothing is said or would be said about routers that do not support ELC at all or do not support it on all interfaces.  I am assuming that it is not intended to make implementation of this capability mandatory in all OSPF deployments. I was trying to understand why a router that satisfies the previous condition so that it is legitimate for it to announce ELC with any IP address prefix might wish to only announce it with some prefixes and not others.  This is an interesting question for implementers as the SHOULD implies that an implementation has to provide a configuration option on a per prefix basis > >> >> s4, para 3: In that case, what does the absence signify?  Should we >> care? > > the absence of ERLD-MSD advertisements only indicates that a node > does not support advertisement of ERLD > > It can not be interpreted that ERLD is not supported.  Old nodes that do > not advertise ERLD-MSD can not be assumed not to support non-zero ERLD. > There are just too many negatives in this last sentence!  OK.. so if the router does not suport ERLD-MSD advertisements what can or must the ingress router do to usefully position ELs it is intending to send that might pass through this router?  On further reflection, it seems to me that either there should be some sort of default value for the label stack depth that would otherwise be distributed with ERLD-MSD or routers that support ELs MUST advertise the depth they support. This is looking rather like an issue rather than just a nit. > >> >> s4, para 4: >> This needs a correction and a reference to where the Link MSD Sub-TLV is >> defined.  As a matter of interest, is there any reason why this >> should be sent >> in an OSPF context?  If not why not just prohibit sending it? If it >> is received >> should it provoke an error rather than being ignored? OLD: When the ERLD >> MSD-Type is received in the OSPFv2 or OSPFv3 Link MSD Sub-TLV, it >> MUST be >> ignored. NEW: >>   When the ERLD-MSD type is received in the OSPFv2 or OSPFv3 Link MSD >> Sub-TLV >>   [RFC8476], it MUST be ignored. > > done. Did you address the question of whether should actually provoke an error since it appears to be a protocol error? > >> ENDS >> >> s5:  This section needs to be rewritten to be 'future proof' rather than >> referring to the temporary allocations.  A note about the temporary >> allocations >> can be added with a RFC Editor note requesting its removal on final >> publication. > > I suppose you meant section 6 - IANA Considerations. Yes, I did.  Sorry. > > I have updated the IANA section. Good. > > thanks, > Peter >> >> >> >> >> > From nobody Mon May 11 11:15:18 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 364D03A0941; Mon, 11 May 2020 11:15:11 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -9.601 X-Spam-Level: X-Spam-Status: No, score=-9.601 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIMWL_WL_MED=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, SPF_PASS=-0.001, URIBL_BLOCKED=0.001, USER_IN_DEF_DKIM_WL=-7.5] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=cisco.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id spO_q0A8DgKo; Mon, 11 May 2020 11:15:08 -0700 (PDT) Received: from aer-iport-1.cisco.com (aer-iport-1.cisco.com [173.38.203.51]) (using TLSv1.2 with cipher DHE-RSA-SEED-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id BFAFC3A0028; Mon, 11 May 2020 11:15:07 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=8424; q=dns/txt; s=iport; t=1589220908; x=1590430508; h=subject:to:cc:references:from:message-id:date: mime-version:in-reply-to:content-transfer-encoding; bh=bprbem0MZ6PJM9CZ/By1dzLY+AOeigUDCspk9KqVfMg=; b=FNXM8f/y7YMVu8r5CRm7XKC2Od/R4IkcbX51PvG34hTRKJsY2+iXroGn vQWDYKOQSm7bVEb0iiGDh9PAQJS8CSkD2Q+qQ1TTzWoAlOp5xIhE6dmKZ mPftAuJygwa+s+2OxvjfudLZD/S4fWj+NCzwj1S72hm5HujCU0GvXHMPT A=; X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: =?us-ascii?q?A0CDCQDxlLle/xbLJq1mHAEBAQEBAQc?= =?us-ascii?q?BARIBAQQEAQFAgUeBfYEcUAUgEoRQiQGHXQglmXmBZwsBAQEOIwwEAQGERAK?= =?us-ascii?q?CMjgTAgMBAQsBAQUBAQECAQUEbYVWDIVxAQEBAQIBIw8BBTMOBQsLFAQCAhE?= =?us-ascii?q?VAgJXBgEMCAEBgyIBglwgD65MdoEyhVGDWYE6BoEOKoxegUE/gRABJwyCXT6?= =?us-ascii?q?CZwKBHoEGglWCYASOdKFqgg2CVIJxhSqFf4oIBh2CXIhnhFqNHZAdiVqQeoJ?= =?us-ascii?q?+gWkigVYzGggbFRqDC08YDYE4jxQXgQMBCYdWhUQ/A2cCBgEHAQEDCYw+LII?= =?us-ascii?q?ZAQE?= X-IronPort-AV: E=Sophos;i="5.73,380,1583193600"; d="scan'208";a="26088036" Received: from aer-iport-nat.cisco.com (HELO aer-core-3.cisco.com) ([173.38.203.22]) by aer-iport-1.cisco.com with ESMTP/TLS/DHE-RSA-SEED-SHA; 11 May 2020 18:15:03 +0000 Received: from [10.60.140.51] (ams-ppsenak-nitro2.cisco.com [10.60.140.51]) by aer-core-3.cisco.com (8.15.2/8.15.2) with ESMTP id 04BIF3Rv021320; Mon, 11 May 2020 18:15:03 GMT To: Elwyn Davies , gen-art@ietf.org Cc: draft-ietf-ospf-mpls-elc.all@ietf.org, last-call@ietf.org, lsr@ietf.org References: <158877512992.25308.14489968716385236242@ietfa.amsl.com> <5f206fd3-8918-9c1f-e403-8591c54acf83@cisco.com> From: Peter Psenak Message-ID: <6d5e7418-0405-6c6d-8eee-43b2eabe1ff7@cisco.com> Date: Mon, 11 May 2020 20:15:03 +0200 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:60.0) Gecko/20100101 Thunderbird/60.7.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit X-Outbound-SMTP-Client: 10.60.140.51, ams-ppsenak-nitro2.cisco.com X-Outbound-Node: aer-core-3.cisco.com Archived-At: Subject: Re: [Lsr] Genart last call review of draft-ietf-ospf-mpls-elc-13 X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 11 May 2020 18:15:11 -0000 Hi Elwyn, please see inline (##PP) On 11/05/2020 19:37, Elwyn Davies wrote: > Hi, Peter. > > In the light of some of your responses here, I would just like to > clarify that one of the reasons for gen-art reviews is to try and make > extremely complicated technical documents more accessible for those who > are not as deeply embedded in the jargon and technicalities of the > subject as well as making sure that readers can quickly determine > whether a document is relevant to work that they are doing. > > Please take this into account when considering your further actions. > > Note that the optionality of ERLD-MSD advertisements appears on > reflection to be a more serious issue than just an editorial nit. > > Regards, > > Elwyn > > On 07/05/2020 08:53, Peter Psenak wrote: > >> Hi Elwyn, >> >> please see inline: >> >> On 06/05/2020 16:25, Elwyn Davies via Datatracker wrote: >>> Reviewer: Elwyn Davies >>> Review result: Ready with Nits >>> >>> I am the assigned Gen-ART reviewer for this draft. The General Area >>> Review Team (Gen-ART) reviews all IETF documents being processed >>> by the IESG for the IETF Chair.  Please treat these comments just >>> like any other last call comments. >>> >>> For more information, please see the FAQ at >>> >>> . >>> >>> Document: draft-ietf-ospf-mpls-elc-13 >>> Reviewer: Elwyn Davies >>> Review Date: 2020-05-06 >>> IETF LC End Date: 2020-05-05 >>> IESG Telechat date: 2020-05-21 >>> >>> Summary: >>> Ready with nits.  Aside:  I have to say that the convolutions and >>> cross-referencing of doing the OSPF and IS-IS  extensions plus BGP-LS >>> added to >>> the cross-linking with MPLS is leading to mind-blowing complexity. >>> Sooner or >>> later something is going to blow up here! >>> >>> Major issues: >>> None >>> >>> Minor issues: >>> None >>> >>> Nits/editorial comments: >>> >>> Abstract and title :  The application to BGP-LS (s5) is not mentioned >>> in the >>> abstract or the title.  Also the first use of BGP-LS needs to be >>> expanded. >> >> Why would the BGP-LS need to be mentioned in the abstract? > At present BGP-LS is the subject of a separate document and this > document extends the BGP add-on called BGP-LS as well as OSPF v2 and > v3.  It is therefor important that implementers of BGP-LS can easily > find documents that are relevant to their work. ##PP not that I necessarily agree, but let me add it. >> >> I have expanded the first use of BGP-LS >> >>> >>> Abstract: s/tunnel/LSP/ >> >> done >> >>> >>> s1: Suggest s/SR-MPLS/Segment Routing with the MPLS Data Plane/ >>> >>> s1: Query:  As a non-expert in this area, I was wondering if the >>> signalling >>> capability is or will be implemented in IS-IS?  A brief comment on >>> the status >>> wrt IS-IS would be helpful.  [It turns out that you already reference >>> the >>> document that implements this later in this draft.] >> >> yes, it is being added to ISIS. Yes, this draft reference the ISIS >> draft. I see no reason to to include ISIS draft status in this >> document though. > As has been mentioned in other reviews of this document and the > corresponding IS-IS document, having two documents that cover this > extension is not very desirable.  As a non-expert, but who knows that > OSPF and IS-IS provide closely related functionality, one gets to this > point in the document and wonders why OSPF and not IS-IS. If the WG does > not bite the bullet and combine the drafts, it would be highly desirable > to point out that the same functionality is being proposed for all three > protocols ##PP Alvaro has responded to this already. Please have a look at his response to Barry Leiba's comments. All I would add is that we have had many separate RFCs for OSPF and ISIS specifying the same functional extension in the past. I see no reason why that would suddenly became an issue. >> >> >>> >>> s1, last sentence: s/it's/it is/ >> >> done >> >>> >>> s3: It would be a good idea to expand 'prefix' to 'address prefix >>> advertisement' on its first occurrence here.  Thereafter 'prefix' is >>> fine by me. >> >> "prefix" is being used in almost all OSPF and ISIS document, we never >> use address prefix. > Really? Revisiting RFC 2328 (OSPFv2) we see that prefix is not used at > all and in RFC 5340 (OSPF for IPv6)  the term prefix is introduced as > 'IP address prefix'.  In order to make it clear of what this is a > prefix, and what is going on here, expanding the initial usage is highly > desirable. well, one can argue that we have "OSPFv2 Extended Prefix TLV", not the "OSPFv2 Extended Address Prefix TLV" and "OSPFv3 PrefixOptions" rather than "OSPFv3 AddressPrefixOptions" >> >> >>> >>> s3, para 3: Why would a router not advertise the ELC with all >>> prefixes?  Can >>> you say why this ought not to be a MUST. >> >> advertising ELC property with prefix advertisement is optional. We can >> not mandate it. It would make all routers not advertising this data >> violating this spec. > Er, no.  Nothing is said or would be said about routers that do not > support ELC at all or do not support it on all interfaces.  I am > assuming that it is not intended to make implementation of this > capability mandatory in all OSPF deployments. I was trying to understand > why a router that satisfies the previous condition so that it is > legitimate for it to announce ELC with any IP address prefix might wish > to only announce it with some prefixes and not others.  This is an > interesting question for implementers as the SHOULD implies that an > implementation has to provide a configuration option on a per prefix basis ##PP I don't see a problem. We can not mandate the advertisement of something that is optional. >> >>> >>> s4, para 3: In that case, what does the absence signify?  Should we >>> care? >> >> the absence of ERLD-MSD advertisements only indicates that a node >> does not support advertisement of ERLD >> >> It can not be interpreted that ERLD is not supported.  Old nodes that do >> not advertise ERLD-MSD can not be assumed not to support non-zero ERLD. >> > There are just too many negatives in this last sentence!  OK.. so if the > router does not suport ERLD-MSD advertisements what can or must the > ingress router do to usefully position ELs it is intending to send that > might pass through this router? ##PP What to do is not protocol specific and can not be specified in protocol drafts that specify hoe to advertise the ERLD value. Please note that ERLD is NOT used by protocols. > On further reflection, it seems to me > that either there should be some sort of default value for the label > stack depth that would otherwise be distributed with ERLD-MSD or routers > that support ELs MUST advertise the depth they support. ##PP I don't see how we can suddenly start to mandate this. > > This is looking rather like an issue rather than just a nit. > >> >>> >>> s4, para 4: >>> This needs a correction and a reference to where the Link MSD Sub-TLV is >>> defined.  As a matter of interest, is there any reason why this >>> should be sent >>> in an OSPF context?  If not why not just prohibit sending it? If it >>> is received >>> should it provoke an error rather than being ignored? OLD: When the ERLD >>> MSD-Type is received in the OSPFv2 or OSPFv3 Link MSD Sub-TLV, it >>> MUST be >>> ignored. NEW: >>>   When the ERLD-MSD type is received in the OSPFv2 or OSPFv3 Link MSD >>> Sub-TLV >>>   [RFC8476], it MUST be ignored. >> >> done. > Did you address the question of whether should actually provoke an error > since it appears to be a protocol error? ##PP I replaced it with your proposed text. thanks, Peter >> >>> ENDS >>> >>> s5:  This section needs to be rewritten to be 'future proof' rather than >>> referring to the temporary allocations.  A note about the temporary >>> allocations >>> can be added with a RFC Editor note requesting its removal on final >>> publication. >> >> I suppose you meant section 6 - IANA Considerations. > Yes, I did.  Sorry. >> >> I have updated the IANA section. > Good. >> >> thanks, >> Peter >>> >>> >>> >>> >>> >> > > From nobody Mon May 11 12:18:43 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 60AEA3A0B04; Mon, 11 May 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Content-Transfer-Encoding: quoted-printable Archived-At: Subject: Re: [Lsr] AD Review of draft-ietf-ospf-te-link-attr-reuse-10 X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 14 May 2020 17:27:00 -0000 On May 5, 2020 at 6:08:27 AM, Peter Psenak wrote: Peter: Hi! ... > I tried to address all of them, some have been resolved during ISIS > draft review, in which case I took the same resolution for this draf. > > Please see inline, look for ##PP There's only one outstanding comment that I don't think was answered -- or at least I missed the meaning of the answer. =C2=A0Please see below. I am also including some comments based on -11. =C2=A0Except for the Normative language in =C2=A712.1, all the comments are basically nits/suggestions. I am starting the IETF Last Call for this document and draft-ietf-isis-te-app. =C2=A0We can work on these remaining comments while we do that. Thanks! Alvaro. ... > 434 6. Local Interface IPv6 Address Sub-TLV > > [major] The Local/Remote Interface IPv6 Address Sub-TLVs (rfc5329) can > include multiple addresses for a link. It seems to me that it could > be possible for different applications to use different addresses. If > that is the case, then it seems that these sub-TLVs should not be > application independent. Why are they not considered to be > application specific? > > [minor] Why are IPv4 addresses not considered? > > ##PP > IPv4 local address is part of the basic spec. > IPv6 remote address has been added in rfc8379. For IPv4: what basic spec? For IPv6: rfc8379 doesn=E2=80=99t seem to relate to the questions =E2=80=94= am I missing something? [Line numbers from idnits] draft-ietf-ospf-te-link-attr-reuse-11 ... 168 4.1. =C2=A0OSPFv2 Extended Link Opaque LSA and OSPFv3 E-Router-LSA ... 184 =C2=A0 3. =C2=A0There is clear distinction between link attributes use= d by RSVP- 185 =C2=A0 =C2=A0 =C2=A0 TE and link attributes used by other OSPFv2 or OS= PFv3 186 =C2=A0 =C2=A0 =C2=A0 applications. [nit] s/is clear distinction/is a clear distinction ... 203 =C2=A0 TE link attributes used for RSVP-TE/GMPLS continue use OSPFv2 T= E 204 =C2=A0 Opaque LSA [RFC3630] and OSPFv3 Intra-Area-TE-LSA [RFC5329]. [nit] s/continue use/continue to use ... 213 5. =C2=A0Advertisement of Application Specific Values ... 252 =C2=A0 =C2=A0 =C2=A0SABM Length: Standard Application Identifier Bit-M= ask Length in 253 =C2=A0 =C2=A0 =C2=A0octets. =C2=A0The legal values are 0, 4 or 8. =C2= =A0If the Standard 254 =C2=A0 =C2=A0 =C2=A0Application Bit-Mask is not present, the Standard = Application Bit- 255 =C2=A0 =C2=A0 =C2=A0Mask Length MUST be set to 0. 257 =C2=A0 =C2=A0 =C2=A0UDABM Length: User Defined Application Identifier = Bit-Mask Length 258 =C2=A0 =C2=A0 =C2=A0in octets. =C2=A0The legal values are 0, 4 or 8. = =C2=A0If the User Defined 259 =C2=A0 =C2=A0 =C2=A0Application Bit-Mask is not present, the User Defi= ned Application 260 =C2=A0 =C2=A0 =C2=A0Bit-Mask Length MUST be set to 0. [minor] "The legal values are 0, 4 or 8." =C2=A0Should the statement be Normative ("MUST be...")? =C2=A0I know there is a sentence below about ignoring the sub-TLV if a different value is received -- IOW, just a suggestion. ... 319 =C2=A0 =C2=A0 =C2=A0- Unidirectional Link Dela [RFC7471] 321 =C2=A0 =C2=A0 =C2=A0- Min/Max Unidirectional Link Delay [RFC7471] 322 =C2=A0 =C2=A0 =C2=A0- Unidirectional Delay Variation [RFC7471] [nit] There seems to be a line missing... ... 532 12.1. =C2=A0Use of Legacy RSVP-TE LSA Advertisements 534 =C2=A0 Bit Identifiers for Standard Applications are defined in Sectio= n 5. 535 =C2=A0 All of the identifiers defined in this document are associated = with 536 =C2=A0 applications which were already deployed in some networks prior= to 537 =C2=A0 the writing of this document. =C2=A0Therefore, such application= s have been 538 =C2=A0 deployed using the RSVP-TE LSA advertisements. =C2=A0The Standa= rd 539 =C2=A0 Applications defined in this document MAY continue to use RSVP-= TE LSA 540 =C2=A0 advertisements for a given link so long as at least one of the 541 =C2=A0 following conditions is true: [major] s/MAY/may ... 651 12.3.4. =C2=A0Use of Application Specific Advertisements for RSVP-TE 653 =C2=A0 The extensions defined in this document support RSVP-TE as one = of the 654 =C2=A0 supported applications. =C2=A0It is however RECOMMENDED to adve= rtise all 655 =C2=A0 link-attributes for RSVP-TE in the existing OSPFv2 TE Opaque LS= A 656 =C2=A0 [RFC3630] and OSPFv3 Intra-Area-TE-LSA [RFC5329] to maintain ba= ckward 657 =C2=A0 compatibility. =C2=A0RSVP-TE can eventually utilize the applica= tion 658 =C2=A0 specific advertisements for newly defined link attributes, whic= h are 659 =C2=A0 defined as application specific. [minor] "It is however RECOMMENDED to advertise all link-attributes for RSVP-TE in the existing..." =C2=A0The application specific advertisements can be used and result in duplicate information. =C2=A0The ISIS draft includes some sample steps to eliminate redundancy and get rid of the legacy advertisements -- can we add something similar here? From nobody Thu May 14 10:27:25 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id E41933A0C18; Thu, 14 May 2020 10:27:04 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.098 X-Spam-Level: X-Spam-Status: No, score=-2.098 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, UNPARSEABLE_RELAY=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 8RIrZ7I51ghD; Thu, 14 May 2020 10:27:04 -0700 (PDT) Received: from mail-wr1-x429.google.com (mail-wr1-x429.google.com [IPv6:2a00:1450:4864:20::429]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 795223A0C59; Thu, 14 May 2020 10:27:00 -0700 (PDT) Received: by mail-wr1-x429.google.com with SMTP id i15so5280405wrx.10; Thu, 14 May 2020 10:27:00 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:mime-version:date:message-id:subject:to:cc :content-transfer-encoding; bh=b6eT0QbKK4Bq38oUFR3YHWj6dPRHkDluAApG+xKad6M=; b=FyilZWyBIOZcd7v2+mFQeG1wUZSKEO8weKuWK3CSWewMS64FXCiS446nhzdWVJ8h6T rQ6ESyzOkUYphKIbXMrk4KXOH4usm6QzjOK/QZnaMmpTIA01rxl+BcguzVWjuEVpYFZ7 icfVLwASO/UAKQF7+R0MaHtb6iaKTtS688hFblZ4dMeUUBbz5JxfGqTBOrrsRW2thV/0 4PCgqiRllhRc0QE8OZTfuNBuSgPrfYw/OOVAqQ1OYC2yTXPEgkhtHPYDTkwBeKICbRsP 21lNcnnzfpoy9lcsnXgWXtBjKRYu8QeiXYIIRsGAoFJ0KcyVe4QLCLPE9SvHLuBEnDmz 8oGQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:mime-version:date:message-id:subject:to:cc :content-transfer-encoding; bh=b6eT0QbKK4Bq38oUFR3YHWj6dPRHkDluAApG+xKad6M=; b=JfV+uGoaO7X30UqGwOyPMYwESXr46U+EyFgKQJOorz1SxOjoM13kFoUZKYU8KgSV5t 4gx++MbGYLL8IOnrjiUL1/q4PIHXQw1bohEYeHqtEnN6g4lP+2qWEGe+CIyaM2+Ro/mW DI1MN4nvlG+jEtm51H/AZYE9s+nB56BAfZ2uV55r+z8fNLT61vCtZrtJsOE4HAc0rPPL UkdzNeDY9OisPAB9VkYAVpsRBTq24MtvycUfrGCNt/XQPZsLLKRxV5gzgYbpB9kJuqvM oKczq75U8w7D6MDpRAtt95xCPC7gTzZY2ENEUXSsqzdayqTXyLW1OclMu9HvdblqmEr3 fHnw== X-Gm-Message-State: AOAM533iWCnC+P3st5Ge1cSrA+knXdRIhVWMNDm0upNt7jYl8YdRrDp4 Ki/qj08BifMevMV20AbyTO8xEWDRxNQRAqPO6NmtUsj/ X-Google-Smtp-Source: ABdhPJympnl8C1hgFbMAud7uHtblslwwbjYD8MYUC899HBnTH+OLcxhe+IszRA61kcoE/oM5Ndxgu5bBPUcegezCNZ4= X-Received: by 2002:a5d:6943:: with SMTP id r3mr4721710wrw.113.1589477218376; Thu, 14 May 2020 10:26:58 -0700 (PDT) Received: from 1058052472880 named unknown by gmailapi.google.com with HTTPREST; Thu, 14 May 2020 10:26:57 -0700 From: Alvaro Retana MIME-Version: 1.0 Date: Thu, 14 May 2020 10:26:57 -0700 Message-ID: To: draft-ietf-isis-te-app.authors@ietf.org Cc: draft-ietf-ospf-te-link-attr-reuse@ietf.org, "lsr-chairs@ietf.org" , lsr@ietf.org, Yingzhen Qu , "Acee Lindem (acee)" Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Archived-At: Subject: [Lsr] Considerations for Extended TE Metrics (draft-ietf-isis-te-app) X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 14 May 2020 17:27:09 -0000 Dear authors: When reviewing the updates to draft-ietf-ospf-te-link-attr-reuse-11, I noticed the following difference with respect to draft-ietf-isis-te-app-12: [] draft-ietf-isis-te-app-12: 437 4.2.3. =C2=A0Considerations for Extended TE Metrics 439 =C2=A0 [RFC8570] defines a number of dynamic performance metrics assoc= iated 440 =C2=A0 with a link. =C2=A0It is conceivable that such metrics could be= measured 441 =C2=A0 specific to traffic associated with a specific application. 442 =C2=A0 Therefore this document includes support for advertising these = link 443 =C2=A0 attributes specific to a given application. =C2=A0However, in p= ractice it 444 =C2=A0 may well be more practical to have these metrics reflect the 445 =C2=A0 performance of all traffic on the link regardless of applicatio= n. =C2=A0In 446 =C2=A0 such cases, advertisements for these attributes will be associa= ted 447 =C2=A0 with all of the applications utilizing that link. [] draft-ietf-ospf-te-link-attr-reuse-11: 449 8. =C2=A0Considerations for Extended TE Metrics 451 =C2=A0 [RFC7471] defines a number of dynamic performance metrics assoc= iated 452 =C2=A0 with a link. =C2=A0It is conceivable that such metrics could be= measured 453 =C2=A0 specific to traffic associated with a specific application. 454 =C2=A0 Therefore this document includes support for advertising these = link 455 =C2=A0 attributes specific to a given application. =C2=A0However, in p= ractice it 456 =C2=A0 may well be more practical to have these metrics reflect the 457 =C2=A0 performance of all traffic on the link regardless of applicatio= n. =C2=A0In 458 =C2=A0 such cases, advertisements for these attributes can be associat= ed 459 =C2=A0 with all of the applications utilizing that link, for example, = by 460 =C2=A0 listing all applications in the Application Bit-Mask. The difference is in the last sentence: the OSPF draft points at how the user can associate the attributes with all the applications...while the ISIS draft just says that the "attributes will be associated with all of the applications". I'm assuming that the ISIS operation is similar: the new sub-TLV would have to include all the appropriate bits in the Application Bit-Mask. Is that a correct assumption, or will ISIS behave differently? Please clarify the text in the ISIS draft. As I mentioned in the thread about draft-ietf-ospf-te-link-attr-reuse, I am starting the IETF Last Call for both documents. =C2=A0We can work on this clarification during that time. Thanks! Alvaro. From nobody Thu May 14 10:42:17 2020 Return-Path: X-Original-To: lsr@ietf.org Delivered-To: lsr@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id C47C23A0C40; Thu, 14 May 2020 10:42:14 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: The IESG To: "IETF-Announce" X-Test-IDTracker: no X-IETF-IDTracker: 6.130.0 Auto-Submitted: auto-generated Precedence: bulk CC: aretana.ietf@gmail.com, Acee Lindem , acee@cisco.com, draft-ietf-isis-te-app@ietf.org, lsr-chairs@ietf.org, lsr@ietf.org Reply-To: last-call@ietf.org Sender: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-ID: <158947813477.20377.12872904987510968381@ietfa.amsl.com> Date: Thu, 14 May 2020 10:42:14 -0700 Archived-At: Subject: [Lsr] Last Call: (IS-IS TE Attributes per application) to Proposed Standard X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 14 May 2020 17:42:15 -0000 The IESG has received a request from the Link State Routing WG (lsr) to consider the following document: - 'IS-IS TE Attributes per application' as Proposed Standard The IESG plans to make a decision in the next few weeks, and solicits final comments on this action. Please send substantive comments to the last-call@ietf.org mailing lists by 2020-05-29. Exceptionally, comments may be sent to iesg@ietf.org instead. In either case, please retain the beginning of the Subject line to allow automated sorting. Abstract Existing traffic engineering related link attribute advertisements have been defined and are used in RSVP-TE deployments. Since the original RSVP-TE use case was defined, additional applications (e.g., Segment Routing Traffic Engineering, Loop Free Alternate) have been defined which also make use of the link attribute advertisements. In cases where multiple applications wish to make use of these link attributes the current advertisements do not support application specific values for a given attribute nor do they support indication of which applications are using the advertised value for a given link. This document introduces new link attribute advertisements which address both of these shortcomings. The file can be obtained via https://datatracker.ietf.org/doc/draft-ietf-isis-te-app/ No IPR declarations have been submitted directly on this I-D. From nobody Thu May 14 10:42:51 2020 Return-Path: X-Original-To: lsr@ietf.org Delivered-To: lsr@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id D788E3A0C81; Thu, 14 May 2020 10:42:38 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: The IESG To: "IETF-Announce" X-Test-IDTracker: no X-IETF-IDTracker: 6.130.0 Auto-Submitted: auto-generated Precedence: bulk CC: aretana.ietf@gmail.com, Acee Lindem , Yingzhen Qu , lsr-chairs@ietf.org, draft-ietf-ospf-te-link-attr-reuse@ietf.org, lsr@ietf.org, yingzhen.qu@futurewei.com Reply-To: last-call@ietf.org Sender: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-ID: <158947815840.2847.11559953780525133321@ietfa.amsl.com> Date: Thu, 14 May 2020 10:42:38 -0700 Archived-At: Subject: [Lsr] Last Call: (OSPF Link Traffic Engineering Attribute Reuse) to Proposed Standard X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 14 May 2020 17:42:46 -0000 The IESG has received a request from the Link State Routing WG (lsr) to consider the following document: - 'OSPF Link Traffic Engineering Attribute Reuse' as Proposed Standard The IESG plans to make a decision in the next few weeks, and solicits final comments on this action. Please send substantive comments to the last-call@ietf.org mailing lists by 2020-05-29. Exceptionally, comments may be sent to iesg@ietf.org instead. In either case, please retain the beginning of the Subject line to allow automated sorting. Abstract Existing traffic engineering related link attribute advertisements have been defined and are used in RSVP-TE deployments. Since the original RSVP-TE use case was defined, additional applications (e.g., Segment Routing Traffic Engineering, Loop Free Alternate) have been defined which also make use of the link attribute advertisements. In cases where multiple applications wish to make use of these link attributes the current advertisements do not support application specific values for a given attribute nor do they support indication of which applications are using the advertised value for a given link. This document introduces new link attribute advertisements in OSPFv2 and OSPFv3 which address both of these shortcomings. The file can be obtained via https://datatracker.ietf.org/doc/draft-ietf-ospf-te-link-attr-reuse/ No IPR declarations have been submitted directly on this I-D. From nobody Thu May 14 12:46:32 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 973583A0C4F; Thu, 14 May 2020 12:46:14 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.096 X-Spam-Level: X-Spam-Status: No, score=-2.096 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, UNPARSEABLE_RELAY=0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id kx5QrM5vvilz; Thu, 14 May 2020 12:46:12 -0700 (PDT) Received: from mail-wr1-x42c.google.com (mail-wr1-x42c.google.com [IPv6:2a00:1450:4864:20::42c]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id B7D463A0C4D; Thu, 14 May 2020 12:46:11 -0700 (PDT) Received: by mail-wr1-x42c.google.com with SMTP id y3so228655wrt.1; Thu, 14 May 2020 12:46:11 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:in-reply-to:references:mime-version:date:message-id:subject:to :cc; bh=+IsOwcBsqmVwgL1qhDUalf7mrRFVXIkSWL602P/zkiM=; b=W1qc4qJrLYnMxKSzNrm3FnpXIeqG2wQAbcjVT1fgggFv9XSuai1yhofvl/Jf/Jc7vs DP345LHqzIP12mmvIln/BqKyBafVbMAT0R5ZNt5BBFZsiuwSoYH5MNvVHZwhpLUuoblt tucMDnqwsRqKXQJCljblNF+XGaNSfQsLwgZSnLr33hQdWNwdnFZSvSruo4dhPa5eRk8K 1PXVrv19gD3VaiReStxj5qvx7QTTY3NzvKPdmckK+ZMRAHZhmUbvq6M0a59cdnsQ7QD9 6OE5/kCKOT4Vv1m053ns0S/gDtbKoo8SpZXJh+fICCJT1LdGozLZi8EdvNrKSVOA/kmW Ad1w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:in-reply-to:references:mime-version:date :message-id:subject:to:cc; bh=+IsOwcBsqmVwgL1qhDUalf7mrRFVXIkSWL602P/zkiM=; b=KLFfxvHYCeQ0dleylz4MxSsGOfUoH0FBJ9qRViLWCLKOhhtX1PO2ph5jb5o16NUz8z e9z3bbq87PZbV5oBSM36vYgQ0SYLBlKRCVmN0V9uuAVbu0Nmne1HznwtGVAfomHyn6Lr TqIQpnP+1VFkHqwDVjCY5cWoszuZmM2OdPbORExDdcrCJp5ZIIAiNr8eY3DY5epYCUvY +IpR3bDvJIjHCkca/IweFyGcC9rA0aVm//lPyb8+j9zJvZWLnTQdToqrU36g8CESLHkd A2CdJI8q5FcUgkGm5qMIuBibclxjxAmzC8K8u0EeOBLonnbr7re+bDABk4Ij4F3C1pA3 6F9g== X-Gm-Message-State: AOAM532D4GVxkf8FkXS/cDzt/nCjbN4T3RN+7MyIy0ZLKqMiC1YfLMJG pIDc9+VJE911mcmVhyl6Wt23u4lMEBqvc21HQnE= X-Google-Smtp-Source: ABdhPJxldCTQ+SiVpiQ0CFH3YHMVhHcsWxWqfhI8xjZH7ElRgIHy0zuGa1586uJYxxL4UX8Q1nMiBk4UeQ/zxucmxKU= X-Received: by 2002:a5d:5089:: with SMTP id a9mr41228wrt.147.1589485570292; Thu, 14 May 2020 12:46:10 -0700 (PDT) Received: from 1058052472880 named unknown by gmailapi.google.com with HTTPREST; Thu, 14 May 2020 12:46:09 -0700 From: Alvaro Retana In-Reply-To: References: <158877512992.25308.14489968716385236242@ietfa.amsl.com> <5f206fd3-8918-9c1f-e403-8591c54acf83@cisco.com> MIME-Version: 1.0 Date: Thu, 14 May 2020 12:46:09 -0700 Message-ID: To: "Acee Lindem (acee)" , "Peter Psenak (ppsenak)" , Elwyn Davies , "gen-art@ietf.org" Cc: "last-call@ietf.org" , "draft-ietf-ospf-mpls-elc.all@ietf.org" , "lsr@ietf.org" Content-Type: multipart/alternative; boundary="000000000000cb044b05a5a0f296" Archived-At: Subject: Re: [Lsr] Genart last call review of draft-ietf-ospf-mpls-elc-13 X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 14 May 2020 19:46:15 -0000 --000000000000cb044b05a5a0f296 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hi! Yes, we cannot specify something that routers unaware of this specification should or shouldn=E2=80=99t do. I believe that Elwyn=E2=80=99s point is this: *if a router supports this specification* then when would it not advertise the ELC? IOW, the specification only obviously applies to implementations that support it =E2= =80=94 in that case I would think that if a router supports ELs on all of its interfaces then it would always advertise the ELC, right? Thanks! Alvaro. On May 11, 2020 at 3:18:34 PM, Acee Lindem (acee) (acee@cisco.com) wrote: Note that the optionality of ERLD-MSD advertisements appears on reflection to be a more serious issue than just an editorial nit. So what would you suggest? There are existing implementations that support multipath forwarding entropy using MPLS entropy labels but do not signal that capability in OSPF. We can't have a document that retroactively mandates that they signal it. This wouldn't be backward compatible. How can you possibly see this as a serious issue? --000000000000cb044b05a5a0f296 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable =
Hi!

Yes, we cannot specify something that routers unaware of this s= pecification should or shouldn=E2=80=99t do.

I believe that Elwyn=E2=80=99s point is this: *if= a router supports this specification* then when would it not advertise the= ELC?=C2=A0 IOW, the specification only obviously applies to implementation= s that support it =E2=80=94 in that case I would think that if a router sup= ports ELs on all of its interfaces then it would always advertise the ELC, = right?

<= /div>

Thanks!

Alvaro.

On May 11, 2020 at 3:18:34 PM, Acee Lindem (acee) (acee@cisco.com) wrote:

Not= e that the optionality of ERLD-MSD advertisements appears on=C2=A0
reflection to be a more seri= ous issue than just an editorial nit.= =C2=A0

So what wo= uld you suggest? There are existing implementations that support multipath = forwarding entropy using MPLS entropy labels but do not signal that capabil= ity in OSPF. We can't have a document that retroactively mandates that = they signal it. This wouldn't be backward compatible. How can you possi= bly see this as a serious issue?=C2= =A0
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(Postfix) with ESMTP id 61DAC3A00D2; Thu, 14 May 2020 18:25:50 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit From: Warren Kumari via Datatracker To: "The IESG" Cc: draft-ietf-ospf-mpls-elc@ietf.org, lsr-chairs@ietf.org, lsr@ietf.org, Acee Lindem , aretana.ietf@gmail.com, acee@cisco.com X-Test-IDTracker: no X-IETF-IDTracker: 6.130.0 Auto-Submitted: auto-generated Precedence: bulk Reply-To: Warren Kumari Message-ID: <158950595036.5639.14249690264747935521@ietfa.amsl.com> Date: Thu, 14 May 2020 18:25:50 -0700 Archived-At: Subject: [Lsr] Warren Kumari's No Objection on draft-ietf-ospf-mpls-elc-13: (with COMMENT) X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 15 May 2020 01:25:51 -0000 Warren Kumari has entered the following ballot position for draft-ietf-ospf-mpls-elc-13: No Objection When responding, please keep the subject line intact and reply to all email addresses included in the To and CC lines. (Feel free to cut this introductory paragraph, however.) Please refer to https://www.ietf.org/iesg/statement/discuss-criteria.html for more information about IESG DISCUSS and COMMENT positions. The document, along with other ballot positions, can be found here: https://datatracker.ietf.org/doc/draft-ietf-ospf-mpls-elc/ ---------------------------------------------------------------------- COMMENT: ---------------------------------------------------------------------- Nit: “ When an OSPF Autonomous System Boundary Router (ASBR) redistributes a prefix from another instance of the OSPF or from some other protocol, it SHOULD preserve the ELC signaling for the prefix.“ S/the /OSPF/OSPF/. S/for the prefix/for the prefix (if it exists)/ — some protocols will not have / carry the ELC. Apologies if I missed it, but I didn’t see discussion on *exporting* ELC into other protocols... From nobody Fri May 15 02:18:32 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 2338A3A07C3; Fri, 15 May 2020 02:18:30 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -9.601 X-Spam-Level: X-Spam-Status: No, score=-9.601 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIMWL_WL_MED=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, SPF_PASS=-0.001, URIBL_BLOCKED=0.001, USER_IN_DEF_DKIM_WL=-7.5] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=cisco.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 1roQMX0cU3X4; Fri, 15 May 2020 02:18:28 -0700 (PDT) Received: from aer-iport-2.cisco.com (aer-iport-2.cisco.com [173.38.203.52]) (using TLSv1.2 with cipher DHE-RSA-SEED-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 10DD73A07CB; Fri, 15 May 2020 02:18:26 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=5611; q=dns/txt; s=iport; t=1589534307; x=1590743907; h=subject:to:cc:references:from:message-id:date: mime-version:in-reply-to:content-transfer-encoding; bh=rIkHqlzVvLofuqag0UhjDJIVqhDxlk+tZFm62pDK8q0=; b=V16fMttXklpBm45WzgdmWu9NOUXaZqRRz7nhPlbZQKBe7XIUjoXwH3Xo k5RYTy7usXXgUc8OjTGMt4782Fqrj7HwIe1ES+QNwn83TYwZpHj6GtrJq OhVtC/u+CrZIOKDORzbAYjsH1sU+mIG3cIuBXI3tAFs3tahFn1Pt7fzAM E=; X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: =?us-ascii?q?A0BEBABsXb5e/xbLJq1mHAEBAQEBAQc?= =?us-ascii?q?BARIBAQQEAQFAgUeDcCAShFGJAYdkJZtkCwEBAQ4vBAEBhEQCgjo4EwIDAQE?= =?us-ascii?q?LAQEFAQEBAgEFBG2FYoVyAQUdBg8BBUEQCw4KAgImAgJXBgEMCAEBgyKCfbB?= =?us-ascii?q?BdoEyhVGDe4FAgQ4qjFyBQT+BEAEnDIJdPodigmAEjimkXoJYgnOVSQYdgl2?= =?us-ascii?q?Ib4RbiDGEeJA8nXKBaSKBVjMaCBsVgyVPGA2QTBeOJz8DZwIGAQcBAQMJjzM?= =?us-ascii?q?BAQ?= X-IronPort-AV: E=Sophos;i="5.73,394,1583193600"; d="scan'208";a="26226974" Received: from aer-iport-nat.cisco.com (HELO aer-core-4.cisco.com) ([173.38.203.22]) by aer-iport-2.cisco.com with ESMTP/TLS/DHE-RSA-SEED-SHA; 15 May 2020 09:18:23 +0000 Received: from [10.60.140.51] (ams-ppsenak-nitro2.cisco.com [10.60.140.51]) by aer-core-4.cisco.com (8.15.2/8.15.2) with ESMTP id 04F9ILWO026349; Fri, 15 May 2020 09:18:22 GMT To: Alvaro Retana , "draft-ietf-ospf-te-link-attr-reuse@ietf.org" Cc: "lsr-chairs@ietf.org" , "lsr@ietf.org" , Yingzhen Qu References: <6e1f3647-5c1f-4c31-27b7-82fe576d2c96@cisco.com> From: Peter Psenak Message-ID: <5f5e22bd-3253-62b7-44aa-1f8d675a706f@cisco.com> Date: Fri, 15 May 2020 11:18:22 +0200 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:60.0) Gecko/20100101 Thunderbird/60.7.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit X-Outbound-SMTP-Client: 10.60.140.51, ams-ppsenak-nitro2.cisco.com X-Outbound-Node: aer-core-4.cisco.com Archived-At: Subject: Re: [Lsr] AD Review of draft-ietf-ospf-te-link-attr-reuse-10 X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 15 May 2020 09:18:30 -0000 Hi Alvaro, please see inline (##PP) On 14/05/2020 19:26, Alvaro Retana wrote: > On May 5, 2020 at 6:08:27 AM, Peter Psenak wrote: > > > Peter: > > Hi! > > > ... >> I tried to address all of them, some have been resolved during ISIS >> draft review, in which case I took the same resolution for this draf. >> >> Please see inline, look for ##PP > > > There's only one outstanding comment that I don't think was answered > -- or at least I missed the meaning of the answer.  Please see below. > > > I am also including some comments based on -11.  Except for the > Normative language in §12.1, all the comments are basically > nits/suggestions. > > > I am starting the IETF Last Call for this document and > draft-ietf-isis-te-app.  We can work on these remaining comments while > we do that. > > Thanks! > > Alvaro. > > > > ... >> 434 6. Local Interface IPv6 Address Sub-TLV >> >> [major] The Local/Remote Interface IPv6 Address Sub-TLVs (rfc5329) can >> include multiple addresses for a link. It seems to me that it could >> be possible for different applications to use different addresses. If >> that is the case, then it seems that these sub-TLVs should not be >> application independent. Why are they not considered to be >> application specific? >> >> [minor] Why are IPv4 addresses not considered? >> >> ##PP >> IPv4 local address is part of the basic spec. >> IPv6 remote address has been added in rfc8379. > > For IPv4: what basic spec? > > For IPv6: rfc8379 doesn’t seem to relate to the questions — am I > missing something? ##PP interface's IP address is part of the Router-LSA's link data - RFC2328, section A.4.2. > > > > > > [Line numbers from idnits] > > draft-ietf-ospf-te-link-attr-reuse-11 > > ... > 168 4.1.  OSPFv2 Extended Link Opaque LSA and OSPFv3 E-Router-LSA > ... > 184   3.  There is clear distinction between link attributes used by RSVP- > 185       TE and link attributes used by other OSPFv2 or OSPFv3 > 186       applications. > > [nit] s/is clear distinction/is a clear distinction ##PP fixed > > > ... > 203   TE link attributes used for RSVP-TE/GMPLS continue use OSPFv2 TE > 204   Opaque LSA [RFC3630] and OSPFv3 Intra-Area-TE-LSA [RFC5329]. > > [nit] s/continue use/continue to use ##PP fixed > > > ... > 213 5.  Advertisement of Application Specific Values > ... > 252      SABM Length: Standard Application Identifier Bit-Mask Length in > 253      octets.  The legal values are 0, 4 or 8.  If the Standard > 254      Application Bit-Mask is not present, the Standard Application Bit- > 255      Mask Length MUST be set to 0. > > 257      UDABM Length: User Defined Application Identifier Bit-Mask Length > 258      in octets.  The legal values are 0, 4 or 8.  If the User Defined > 259      Application Bit-Mask is not present, the User Defined Application > 260      Bit-Mask Length MUST be set to 0. > > [minor] "The legal values are 0, 4 or 8."  Should the statement be > Normative ("MUST be...")?  I know there is a sentence below about > ignoring the sub-TLV if a different value is received -- IOW, just a > suggestion. ##PP Changed to MUST be > > > ... > 319      - Unidirectional Link Dela [RFC7471] > > 321      - Min/Max Unidirectional Link Delay [RFC7471] > 322      - Unidirectional Delay Variation [RFC7471] > > [nit] There seems to be a line missing... ##PP sorry, what line is missing? There is a page break there. > > > ... > 532 12.1.  Use of Legacy RSVP-TE LSA Advertisements > > 534   Bit Identifiers for Standard Applications are defined in Section 5. > 535   All of the identifiers defined in this document are associated with > 536   applications which were already deployed in some networks prior to > 537   the writing of this document.  Therefore, such applications have been > 538   deployed using the RSVP-TE LSA advertisements.  The Standard > 539   Applications defined in this document MAY continue to use RSVP-TE LSA > 540   advertisements for a given link so long as at least one of the > 541   following conditions is true: > > [major] s/MAY/may ##PP ok, changed to may > > > ... > 651 12.3.4.  Use of Application Specific Advertisements for RSVP-TE > > 653   The extensions defined in this document support RSVP-TE as one of the > 654   supported applications.  It is however RECOMMENDED to advertise all > 655   link-attributes for RSVP-TE in the existing OSPFv2 TE Opaque LSA > 656   [RFC3630] and OSPFv3 Intra-Area-TE-LSA [RFC5329] to maintain backward > 657   compatibility.  RSVP-TE can eventually utilize the application > 658   specific advertisements for newly defined link attributes, which are > 659   defined as application specific. > > [minor] "It is however RECOMMENDED to advertise all link-attributes > for RSVP-TE in the existing..."  The application specific > advertisements can be used and result in duplicate information.  The > ISIS draft includes some sample steps to eliminate redundancy and get > rid of the legacy advertisements -- can we add something similar here? ##PP not really. We do NOT want to do what ISIS does in OSPF. ISIS has a problem with the amount of data they can advertise in the TLV. OSPF does not have that issue and as such we are NOT trying to get rid of the old advertisements for RSVP TE to avoid duplication. thanks, Peter > > From nobody Fri May 15 04:22:43 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id AF8273A0923; Fri, 15 May 2020 04:22:40 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -9.601 X-Spam-Level: X-Spam-Status: No, score=-9.601 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIMWL_WL_MED=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, SPF_PASS=-0.001, URIBL_BLOCKED=0.001, USER_IN_DEF_DKIM_WL=-7.5] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=cisco.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id IR1BjkS8nKpZ; Fri, 15 May 2020 04:22:39 -0700 (PDT) Received: from aer-iport-1.cisco.com (aer-iport-1.cisco.com [173.38.203.51]) (using TLSv1.2 with cipher DHE-RSA-SEED-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 560193A0914; Fri, 15 May 2020 04:22:38 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=991; q=dns/txt; s=iport; t=1589541758; x=1590751358; h=subject:to:cc:references:from:message-id:date: mime-version:in-reply-to:content-transfer-encoding; bh=ZDinxfSDv5nBSSM3qlYjwjrzNijhzcU8h1jq8kPiQqM=; b=UVQQO0rol2mSryeylyGjky7TMpS6OII4L3h+vr/VF3u2b+BUt4q5jlXK ZLC0LUuTi0or2mPLffGI10EUDJAxYVhLFOMYSJ2O9nf54fQQhjbut+Uat lzrL2RD3AjJdZsx7qTCQsA/0f9QCtqR3qcGU9iLlSoG+gxkeCqHECdTdh 8=; X-IronPort-AV: E=Sophos;i="5.73,395,1583193600"; d="scan'208";a="26229595" Received: from aer-iport-nat.cisco.com (HELO aer-core-4.cisco.com) ([173.38.203.22]) by aer-iport-1.cisco.com with ESMTP/TLS/DHE-RSA-SEED-SHA; 15 May 2020 11:22:36 +0000 Received: from [10.60.140.51] (ams-ppsenak-nitro2.cisco.com [10.60.140.51]) by aer-core-4.cisco.com (8.15.2/8.15.2) with ESMTP id 04FBMZk7024297; Fri, 15 May 2020 11:22:36 GMT To: Alvaro Retana , lsr@ietf.org Cc: draft-ietf-ospf-mpls-elc@ietf.org, "lsr-chairs@ietf.org" , "Acee Lindem (acee)" References: From: Peter Psenak Message-ID: <972c1a01-3a3d-3f9e-54be-77f131ba2827@cisco.com> Date: Fri, 15 May 2020 13:22:35 +0200 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:60.0) Gecko/20100101 Thunderbird/60.7.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit X-Outbound-SMTP-Client: 10.60.140.51, ams-ppsenak-nitro2.cisco.com X-Outbound-Node: aer-core-4.cisco.com Archived-At: Subject: Re: [Lsr] OSPFv3 Implementations of draft-ietf-ospf-mpls-elc X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 15 May 2020 11:22:41 -0000 Hi, I'm going to update the draft to use bit 0x40 in "OSPFv3 Prefix Options (8 bits) registry" for E-Flag (ELC Flag). thanks, Peter On 07/05/2020 15:10, Alvaro Retana wrote: > Dear lsr WG: > > If you’ve been following the progress of this document, you will have > noticed that it is already in IESG Evaluation. > > IANA discovered a typo in the draft; the current text says "Bit 0x04 in > the "OSPFv3 Prefix Options (8 bits) registry has been assigned to the > E-Flag (ELC Flag)”.   However, the value assigned by IANA is 0x40. > > > Does anyone have an OSPFv3 implementation of this document?  If so, > which value is used, 0x04 or 0x40?  Are there deployments? > > > The Shepherd report doesn’t mention any implementations, and with the > help of the authors it has already been confirmed that cisco, Nokia and > Huawei don’t have an OSPFv3 implementation. > > > Please respond by COB on May 14. > > > Thanks! > > Alvaro. From nobody Fri May 15 04:28:23 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 401023A0928; Fri, 15 May 2020 04:28:16 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -9.601 X-Spam-Level: X-Spam-Status: No, score=-9.601 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIMWL_WL_MED=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, SPF_PASS=-0.001, URIBL_BLOCKED=0.001, USER_IN_DEF_DKIM_WL=-7.5] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=cisco.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id zM5FrCqy4qGS; Fri, 15 May 2020 04:28:14 -0700 (PDT) Received: from aer-iport-1.cisco.com (aer-iport-1.cisco.com [173.38.203.51]) (using TLSv1.2 with cipher DHE-RSA-SEED-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id E47CD3A0924; Fri, 15 May 2020 04:28:13 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=1397; q=dns/txt; s=iport; t=1589542094; x=1590751694; h=subject:to:cc:references:from:message-id:date: mime-version:in-reply-to:content-transfer-encoding; bh=5Y/w7wiJAKHpEJ6+wIinUYIKk8+MmH8tH9ygp+cez7s=; b=U6m5g99DnY/1WnqM56HTG7/HZWj1n2xEtPsqa8EXMYKuMRFDnwErbPSz phO8V8h5umJbDUKXiIH784pjX7gcJAxjKeCW7V9/yYoThi2bwEhtSOojw v13CjNUpSz03GbwcjQV3BBglgVaNv7e3dSh69etn2dSWUyiGv9F8oB+/D w=; X-IronPort-AV: E=Sophos;i="5.73,395,1583193600"; d="scan'208";a="26229657" Received: from aer-iport-nat.cisco.com (HELO aer-core-2.cisco.com) ([173.38.203.22]) by aer-iport-1.cisco.com with ESMTP/TLS/DHE-RSA-SEED-SHA; 15 May 2020 11:28:12 +0000 Received: from [10.60.140.51] (ams-ppsenak-nitro2.cisco.com [10.60.140.51]) by aer-core-2.cisco.com (8.15.2/8.15.2) with ESMTP id 04FBSBM3016436; Fri, 15 May 2020 11:28:11 GMT To: Warren Kumari , The IESG Cc: draft-ietf-ospf-mpls-elc@ietf.org, lsr-chairs@ietf.org, lsr@ietf.org, Acee Lindem , aretana.ietf@gmail.com References: <158950595036.5639.14249690264747935521@ietfa.amsl.com> From: Peter Psenak Message-ID: Date: Fri, 15 May 2020 13:28:11 +0200 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:60.0) Gecko/20100101 Thunderbird/60.7.0 MIME-Version: 1.0 In-Reply-To: <158950595036.5639.14249690264747935521@ietfa.amsl.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit X-Outbound-SMTP-Client: 10.60.140.51, ams-ppsenak-nitro2.cisco.com X-Outbound-Node: aer-core-2.cisco.com Archived-At: Subject: Re: [Lsr] Warren Kumari's No Objection on draft-ietf-ospf-mpls-elc-13: (with COMMENT) X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 15 May 2020 11:28:16 -0000 Hi Warren, On 15/05/2020 03:25, Warren Kumari via Datatracker wrote: > Warren Kumari has entered the following ballot position for > draft-ietf-ospf-mpls-elc-13: No Objection > > When responding, please keep the subject line intact and reply to all > email addresses included in the To and CC lines. (Feel free to cut this > introductory paragraph, however.) > > > Please refer to https://www.ietf.org/iesg/statement/discuss-criteria.html > for more information about IESG DISCUSS and COMMENT positions. > > > The document, along with other ballot positions, can be found here: > https://datatracker.ietf.org/doc/draft-ietf-ospf-mpls-elc/ > > > > ---------------------------------------------------------------------- > COMMENT: > ---------------------------------------------------------------------- > > Nit: “ When an OSPF Autonomous System Boundary Router (ASBR) redistributes a > prefix from another instance of the OSPF or from some other protocol, it > SHOULD preserve the ELC signaling for the prefix.“ > > S/the /OSPF/OSPF/. fixed. > > S/for the prefix/for the prefix (if it exists)/ — some protocols will not have > / carry the ELC. fixed. > > Apologies if I missed it, but I didn’t see discussion on *exporting* ELC into > other protocols... what do you mean by "exporting"? thanks, Peter > > > > > From nobody Fri May 15 10:25:50 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 819EC3A0C0B for ; 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Fri, 15 May 2020 10:25:43 -0700 (PDT) MIME-Version: 1.0 References: <158950595036.5639.14249690264747935521@ietfa.amsl.com> In-Reply-To: From: Warren Kumari Date: Fri, 15 May 2020 13:25:06 -0400 Message-ID: To: Peter Psenak Cc: The IESG , draft-ietf-ospf-mpls-elc@ietf.org, lsr-chairs@ietf.org, lsr@ietf.org, Acee Lindem , Alvaro Retana Content-Type: multipart/alternative; boundary="0000000000005683cd05a5b31af0" Archived-At: Subject: Re: [Lsr] Warren Kumari's No Objection on draft-ietf-ospf-mpls-elc-13: (with COMMENT) X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 15 May 2020 17:25:48 -0000 --0000000000005683cd05a5b31af0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Fri, May 15, 2020 at 7:28 AM Peter Psenak wrote: > Hi Warren, > > On 15/05/2020 03:25, Warren Kumari via Datatracker wrote: > > Warren Kumari has entered the following ballot position for > > draft-ietf-ospf-mpls-elc-13: No Objection > > > > When responding, please keep the subject line intact and reply to all > > email addresses included in the To and CC lines. (Feel free to cut this > > introductory paragraph, however.) > > > > > > Please refer to > https://www.ietf.org/iesg/statement/discuss-criteria.html > > for more information about IESG DISCUSS and COMMENT positions. > > > > > > The document, along with other ballot positions, can be found here: > > https://datatracker.ietf.org/doc/draft-ietf-ospf-mpls-elc/ > > > > > > > > ---------------------------------------------------------------------- > > COMMENT: > > ---------------------------------------------------------------------- > > > > Nit: =E2=80=9C When an OSPF Autonomous System Boundary Router (ASBR) > redistributes a > > prefix from another instance of the OSPF or from some other protocol, > it > > SHOULD preserve the ELC signaling for the prefix.=E2=80=9C > > > > S/the /OSPF/OSPF/. > > fixed. > thanks! > > > > > S/for the prefix/for the prefix (if it exists)/ =E2=80=94 some protocol= s will > not have > > / carry the ELC. > > fixed. > thanks! > > > > > Apologies if I missed it, but I didn=E2=80=99t see discussion on *expor= ting* ELC > into > > other protocols... > > what do you mean by "exporting"? > Sorry -- the above discusses : "When an OSPF Autonomous System Boundary Router (ASBR) redistributes a prefix ... FROM some other protocol, " (imports), but presumably you would also like to be able to do "When an OSPF Autonomous System Boundary Router (ASBR) redistributes a prefix **INTO** some other protocol, ..." (exports). Yes, the "other protocol" document should describe this in detail, but I think that it is worth mentioning the topic here -- we may be helpful for implementers to keep in mind that this may occur, and so the data should be reachable (likely through the RIB). W > > thanks, > Peter > > > > > > > > > > > > > --=20 I don't think the execution is relevant when it was obviously a bad idea in the first place. This is like putting rabid weasels in your pants, and later expressing regret at having chosen those particular rabid weasels and that pair of pants. ---maf --0000000000005683cd05a5b31af0 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable


On Fri, May 15, 2020 at 7:28 AM Pete= r Psenak <ppsenak@cisco.com>= wrote:
Hi Warre= n,

On 15/05/2020 03:25, Warren Kumari via Datatracker wrote:
> Warren Kumari has entered the following ballot position for
> draft-ietf-ospf-mpls-elc-13: No Objection
>
> When responding, please keep the subject line intact and reply to all<= br> > email addresses included in the To and CC lines. (Feel free to cut thi= s
> introductory paragraph, however.)
>
>
> Please refer to https://www.ietf.org/i= esg/statement/discuss-criteria.html
> for more information about IESG DISCUSS and COMMENT positions.
>
>
> The document, along with other ballot positions, can be found here: > https://datatracker.ietf.org/doc/draf= t-ietf-ospf-mpls-elc/
>
>
>
> ----------------------------------------------------------------------=
> COMMENT:
> ----------------------------------------------------------------------=
>
> Nit: =E2=80=9C When an OSPF Autonomous System Boundary Router (ASBR) r= edistributes a
> prefix from another instance of the OSPF or from some other protocol,= =C2=A0 =C2=A0it
> SHOULD preserve the ELC signaling for the prefix.=E2=80=9C
>
> S/the /OSPF/OSPF/.

fixed.

thanks!

>
> S/for the prefix/for the prefix (if it exists)/ =E2=80=94 some protoco= ls will not have
> / carry the ELC.

fixed.

thanks!

>
> Apologies if I missed it, but I didn=E2=80=99t see discussion on *expo= rting* ELC into
> other protocols...

what do you mean by "exporting"?

<= div>
S= orry -- the above discusses : "When an OSPF Autonomous System Boundary Router (ASBR) redis= tributes a=C2=A0prefix ... FROM some other protocol,=C2=A0 " (imports), but presuma= bly you would also like to be able to do "When an OSPF Autonomous System Boundary R= outer (ASBR) redistributes a=C2=A0prefix **INTO** some other protocol,=C2=A0 ..." (= exports). Yes, the "other protocol" document should describe this= in detail, but I think that it is worth mentioning the topic here -- we ma= y be helpful for implementers to keep in mind that this may occur, and so t= he data should be reachable (likely=C2=A0through the RIB).

W
=C2=A0
=

thanks,
Peter

>
>
>
>
>



--
I don't think the execution is relevant when= it was obviously a bad idea in the first place.
This is like putting ra= bid weasels in your pants, and later expressing regret at having chosen tho= se particular rabid weasels and that pair of pants.
=C2=A0 =C2=A0---maf<= /div>
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15.20.2979.033; Fri, 15 May 2020 17:34:50 +0000 From: "Acee Lindem (acee)" To: Warren Kumari , "Peter Psenak (ppsenak)" CC: The IESG , "draft-ietf-ospf-mpls-elc@ietf.org" , "lsr-chairs@ietf.org" , "lsr@ietf.org" , Alvaro Retana Thread-Topic: Warren Kumari's No Objection on draft-ietf-ospf-mpls-elc-13: (with COMMENT) Thread-Index: AQHWKlfIw83n6MjIaEW6gHp7jw6b5qipAySAgABjuQD//7+jAA== Date: Fri, 15 May 2020 17:34:50 +0000 Message-ID: References: <158950595036.5639.14249690264747935521@ietfa.amsl.com> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: user-agent: Microsoft-MacOutlook/16.37.20051002 authentication-results: kumari.net; dkim=none (message not signed) header.d=none;kumari.net; dmarc=none action=none header.from=cisco.com; x-originating-ip: [136.56.133.70] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: 5c1faab4-4725-4201-8391-08d7f8f64529 x-ms-traffictypediagnostic: BYAPR11MB2567: 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<158950595036.5639.14249690264747935521@ietfa.amsl.com> In-Reply-To: From: Warren Kumari Date: Fri, 15 May 2020 17:08:18 -0400 Message-ID: To: "Acee Lindem (acee)" Cc: "Peter Psenak (ppsenak)" , The IESG , "draft-ietf-ospf-mpls-elc@ietf.org" , "lsr-chairs@ietf.org" , "lsr@ietf.org" , Alvaro Retana Content-Type: multipart/alternative; boundary="00000000000095463b05a5b63810" Archived-At: Subject: Re: [Lsr] Warren Kumari's No Objection on draft-ietf-ospf-mpls-elc-13: (with COMMENT) X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 15 May 2020 21:09:01 -0000 --00000000000095463b05a5b63810 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Fri, May 15, 2020 at 1:34 PM Acee Lindem (acee) wrote: > Hi Warren, > > > > *From: *Warren Kumari > *Date: *Friday, May 15, 2020 at 1:25 PM > *To: *"Peter Psenak (ppsenak)" > *Cc: *The IESG , "draft-ietf-ospf-mpls-elc@ietf.org" < > draft-ietf-ospf-mpls-elc@ietf.org>, "lsr-chairs@ietf.org" < > lsr-chairs@ietf.org>, "lsr@ietf.org" , Acee Lindem < > acee@cisco.com>, Alvaro Retana > *Subject: *Re: Warren Kumari's No Objection on > draft-ietf-ospf-mpls-elc-13: (with COMMENT) > *Resent-From: * > *Resent-To: *Acee Lindem , Yingzhen Qu < > yingzhen.ietf@gmail.com>, Christian Hopps > *Resent-Date: *Friday, May 15, 2020 at 1:25 PM > > > > > > > > On Fri, May 15, 2020 at 7:28 AM Peter Psenak wrote: > > Hi Warren, > > On 15/05/2020 03:25, Warren Kumari via Datatracker wrote: > > Warren Kumari has entered the following ballot position for > > draft-ietf-ospf-mpls-elc-13: No Objection > > > > When responding, please keep the subject line intact and reply to all > > email addresses included in the To and CC lines. (Feel free to cut this > > introductory paragraph, however.) > > > > > > Please refer to > https://www.ietf.org/iesg/statement/discuss-criteria.html > > for more information about IESG DISCUSS and COMMENT positions. > > > > > > The document, along with other ballot positions, can be found here: > > https://datatracker.ietf.org/doc/draft-ietf-ospf-mpls-elc/ > > > > > > > > ---------------------------------------------------------------------- > > COMMENT: > > ---------------------------------------------------------------------- > > > > Nit: =E2=80=9C When an OSPF Autonomous System Boundary Router (ASBR) > redistributes a > > prefix from another instance of the OSPF or from some other protocol, > it > > SHOULD preserve the ELC signaling for the prefix.=E2=80=9C > > > > S/the /OSPF/OSPF/. > > fixed. > > > > thanks! > > > > > > S/for the prefix/for the prefix (if it exists)/ =E2=80=94 some protocol= s will > not have > > / carry the ELC. > > fixed. > > > > thanks! > > > > > > Apologies if I missed it, but I didn=E2=80=99t see discussion on *expor= ting* ELC > into > > other protocols... > > what do you mean by "exporting"? > > > > Sorry -- the above discusses : "When an OSPF Autonomous System Boundary > Router (ASBR) redistributes a prefix ... FROM some other protocol, " > (imports), but presumably you would also like to be able to do "When an > OSPF Autonomous System Boundary Router (ASBR) redistributes a prefix > **INTO** some other protocol, ..." (exports). Yes, the "other protocol" > document should describe this in detail, but I think that it is worth > mentioning the topic here -- we may be helpful for implementers to keep i= n > mind that this may occur, and so the data should be reachable > (likely through the RIB). > > > > Can you suggest some text? Do you realize that in the Routing Area, route > redistribution (aka, route import/export) has always been considered an > implementation matter and is not formally specified. It would hard to > standardize this now (other than Routing Policy YANG model) due to > differences between implementations. > Sure -- how about something like: When an OSPF Autonomous System Boundary Router (ASBR) redistributes a prefix from another instance of the OSPF or from some other protocol, it SHOULD preserve the ELC signaling for the prefix. **In addition ASBRs should allow the ELC signaling for the prefix to be preserved when redistributing to another instance of OSPF or to some other protocol** (Addition in asterisks). Note that this is just a suggestion / not a hill I care to die on -- as an ops person, when I read "you should be able to preserve X when importing into Y", I automatically start wondering how / if I can preserve X when exporting from Y. But, 'm also fine if y'all don't want to address this, W > > > Thanks, > Acee > > > > W > > > > > thanks, > Peter > > > > > > > > > > > > > > > > -- > > I don't think the execution is relevant when it was obviously a bad idea > in the first place. > This is like putting rabid weasels in your pants, and later expressing > regret at having chosen those particular rabid weasels and that pair of > pants. > ---maf > --=20 I don't think the execution is relevant when it was obviously a bad idea in the first place. This is like putting rabid weasels in your pants, and later expressing regret at having chosen those particular rabid weasels and that pair of pants. ---maf --00000000000095463b05a5b63810 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable


On Fri, May 15, 2020 at 1:34 PM Acee= Lindem (acee) <acee@cisco.com>= wrote:

Hi Warren,

=C2=A0

From: Warren Kumari <warren@kumari.net&g= t;
Date: Friday, May 15, 2020 at 1:25 PM
To: "Peter Psenak (ppsenak)" <ppsenak@cisco.com>
Cc: The IESG <= iesg@ietf.org>, "draft-ietf-ospf-mpls-elc@ietf.org" <draft-= ietf-ospf-mpls-elc@ietf.org>, "lsr-chairs@ietf.org" <lsr-chairs@ietf.org>, "= ;lsr@ietf.org" &= lt;lsr@ietf.org>, = Acee Lindem <acee@ci= sco.com>, Alvaro Retana <aretana.ietf@gmail.com>
Subject: Re: Warren Kumari's No Objection on draft-ietf-ospf-mpl= s-elc-13: (with COMMENT)
Resent-From: <alias-bounces@ietf.org>
Resent-To: Acee Lindem <acee@cisco.com>, Yingzhen Qu <yingzhen.ietf@gmail.com>, Chri= stian Hopps <chop= ps@chopps.org>
Resent-Date: Friday, May 15, 2020 at 1:25 PM

=C2=A0

=C2=A0

=C2=A0

On Fri, May 15, 2020 at = 7:28 AM Peter Psenak <ppsenak@cisco.com> wrote:

Hi Warren,

On 15/05/2020 03:25, Warren Kumari via Datatracker wrote:
> Warren Kumari has entered the following ballot position for
> draft-ietf-ospf-mpls-elc-13: No Objection
>
> When responding, please keep the subject line intact and reply to all<= br> > email addresses included in the To and CC lines. (Feel free to cut thi= s
> introductory paragraph, however.)
>
>
> Please refer to https://www.ietf.org/iesg/statement/discuss-criteria.html
> for more information about IESG DISCUSS and COMMENT positions.
>
>
> The document, along with other ballot positions, can be found here: > https://datatracker.ietf.org/doc/draft-ietf-ospf-mpls-elc/
>
>
>
> ----------------------------------------------------------------------=
> COMMENT:
> ----------------------------------------------------------------------=
>
> Nit: =E2=80=9C When an OSPF Autonomous System Boundary Router (ASBR) r= edistributes a
> prefix from another instance of the OSPF or from some other protocol,= =C2=A0 =C2=A0it
> SHOULD preserve the ELC signaling for the prefix.=E2=80=9C
>
> S/the /OSPF/OSPF/.

fixed.

=C2=A0

thanks!


>
> S/for the prefix/for the prefix (if it exists)/ =E2=80=94 some protoco= ls will not have
> / carry the ELC.

fixed.

=C2=A0

thanks!


>
> Apologies if I missed it, but I didn=E2=80=99t see discussion on *expo= rting* ELC into
> other protocols...

what do you mean by "exporting"?

=C2=A0

Sorry -- the above discusses : "When an OSPF Autonomous System Boundar= y Router (ASBR) redistributes a=C2=A0prefix ... FROM some other protocol,=C2=A0 " (imports), but presumably you would= also like to be able to do "When an OSPF Autonomous System Boundary R= outer (ASBR) redistributes a=C2=A0prefix **INTO** some other protocol,=C2= =A0 ..." (exports). Yes, the "other protocol" document shoul= d describe this in detail, but I think that it is worth mentioning the topic= here -- we may be helpful for implementers to keep in mind that this may o= ccur, and so the data should be reachable (likely=C2=A0through the RIB).=

=C2=A0

Can you suggest some text? Do you realize that in th= e Routing Area, route redistribution (aka, route import/export) has always = been considered an implementation matter and is not formally specified. It = would hard to standardize this now (other than Routing Policy YANG model) due to differences between implemen= tations.=C2=A0


Sure -- how about something like:
=C2=A0 =C2=A0When an OSPF Autonomo= us System Boundary Router (ASBR) redistributes a
=C2=A0 =C2=A0prefix fro= m another instance of the OSPF or from some other protocol,
=C2=A0 =C2= =A0it SHOULD preserve the ELC signaling for the prefix.=C2=A0
= =C2= =A0 **In addition ASBRs should allow the
=C2=A0 ELC signaling = for the prefix to be preserved when redistributing to=C2=A0another instance= of OSPF or to some other protocol**

(Ad= dition in asterisks).
Note that this is just a suggestion / n= ot a hill I care to die on -- as an ops person, when I read "you shoul= d be able to preserve X when importing into Y", I automatically start = wondering how / if I can preserve X when exporting from Y.=C2=A0

=
But, = 'm also fine if y'all don't want to address this,
W

=C2=A0

=C2=A0

Thanks,
Acee

=C2=A0

W

=C2=A0


thanks,
Peter

>
>
>
>
>


=C2=A0

--

I don't think the ex= ecution is relevant when it was obviously a bad idea in the first place. This is like putting rabid weasels in your pants, and later expressing regr= et at having chosen those particular rabid weasels and that pair of pants.<= br> =C2=A0 =C2=A0---maf



--
I don't think the execution is relevant when= it was obviously a bad idea in the first place.
This is like putting ra= bid weasels in your pants, and later expressing regret at having chosen tho= se particular rabid weasels and that pair of pants.
=C2=A0 =C2=A0---maf<= /div>
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15.20.3000.022; Sat, 16 May 2020 00:06:57 +0000 From: "Les Ginsberg (ginsberg)" To: Warren Kumari , "Acee Lindem (acee)" CC: "draft-ietf-ospf-mpls-elc@ietf.org" , Alvaro Retana , "lsr-chairs@ietf.org" , The IESG , "lsr@ietf.org" , "Peter Psenak (ppsenak)" Thread-Topic: [Lsr] Warren Kumari's No Objection on draft-ietf-ospf-mpls-elc-13: (with COMMENT) Thread-Index: AQHWKt88nb8XfiX4B0qfq1WC166yAqippCoAgAAxL7A= Date: Sat, 16 May 2020 00:06:57 +0000 Message-ID: References: <158950595036.5639.14249690264747935521@ietfa.amsl.com> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: kumari.net; dkim=none (message not signed) header.d=none;kumari.net; dmarc=none action=none header.from=cisco.com; x-originating-ip: [2602:306:36ca:6640:406e:d217:fc24:2439] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: 1f0b6bd4-c6c6-486b-a1cb-08d7f92d0cc1 x-ms-traffictypediagnostic: MW3PR11MB4764: 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X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: 3z8JAzF43ztZdm9Dx/hWv0bJtM6SDBNPCeloO0XhrykTpCMiZFmBqCTjIr0D4coqTK/YC4YMVVfX4FITGk1SFg== X-MS-Exchange-Transport-CrossTenantHeadersStamped: MW3PR11MB4764 X-OriginatorOrg: cisco.com X-Outbound-SMTP-Client: 173.36.7.11, xch-aln-001.cisco.com X-Outbound-Node: alln-core-10.cisco.com Archived-At: Subject: Re: [Lsr] Warren Kumari's No Objection on draft-ietf-ospf-mpls-elc-13: (with COMMENT) X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 16 May 2020 00:07:16 -0000 --_000_MW3PR11MB461963161BD57057C4AD6793C1BA0MW3PR11MB4619namp_ Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 V2FycmVuIOKAkw0KDQpUaGUgcHJvYmxlbSBJIGhhdmUgd2l0aCB5b3VyIHN1Z2dlc3Rpb24gaXMg 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0fee8ff2-a3b2-4018-9c75-3a1d5591fedc X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: D75oZp6k4Ly0poinkUDxpI0IRQK2e528ghe9jSz0SmWM0TLbn/YBuwz0vdezVi3tfDp2Q2NcwE5/k8bSV252dg== X-MS-Exchange-Transport-CrossTenantHeadersStamped: MN2PR13MB4072 Archived-At: Subject: Re: [Lsr] Flooding Topology Computation Algorithm - draft-cc-lsr-flooding-reduction-08 Working Group Adoption Call X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 16 May 2020 00:53:28 -0000 --_000_MN2PR13MB31176C8F642199335CEF6A65F2BA0MN2PR13MB3117namp_ Content-Type: text/plain; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable Support. Best Regards, Huaimo as co-author ________________________________ From: Lsr on behalf of Acee Lindem (acee) Sent: Friday, May 15, 2020 3:39 PM To: lsr@ietf.org Subject: [Lsr] Flooding Topology Computation Algorithm - draft-cc-lsr-flood= ing-reduction-08 Working Group Adoption Call This begins a 3 week (due to holidays) WG adoption call for the =93Flooding= Topology Computation Algorithm=94 draft. Please issue your support or obje= ction to this list by 11:59 PM, UTC on June 5th, 2020. Here is a URL for yo= ur convenience. https://datatracker.ietf.org/doc/draft-cc-lsr-flooding-reduction/ Thanks, Acee --_000_MN2PR13MB31176C8F642199335CEF6A65F2BA0MN2PR13MB3117namp_ Content-Type: text/html; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable
Support.

Best Regards,
Huaimo as co-author
From: Lsr <lsr-bounces@i= etf.org> on behalf of Acee Lindem (acee) <acee=3D40cisco.com@dmarc.ie= tf.org>
Sent: Friday, May 15, 2020 3:39 PM
To: lsr@ietf.org <lsr@ietf.org>
Subject: [Lsr] Flooding Topology Computation Algorithm - draft-cc-ls= r-flooding-reduction-08 Working Group Adoption Call
 

This begins a 3 week (due to holidays) WG = adoption call for the =93Flooding Topology Computation Algorithm=94 draft. = Please issue your support or objection to this list by 11:59 PM, UTC on Jun= e 5th, 2020. Here is a URL for your convenience.

 

https://datatracker.ietf.org/doc/draft-cc-lsr-flooding-reduction/<= /a>

 

Thanks,
Acee

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Sat, 16 May 2020 01:18:12 +0000 From: Huaimo Chen To: "Acee Lindem (acee)" , "draft-cc-lsr-flooding-reduction@ietf.org" CC: "lsr@ietf.org" Thread-Topic: Flooding Topology Computation Algorithm - draft-cc-lsr-flooding-reduction-08 IPR Poll Thread-Index: AQHWKvGqNKvEXg3aGUuKshXpjzraMqip4z8t Date: Sat, 16 May 2020 01:18:12 +0000 Message-ID: References: <47A153D9-E547-4C4D-A828-EB4410A44048@cisco.com> In-Reply-To: <47A153D9-E547-4C4D-A828-EB4410A44048@cisco.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: cisco.com; dkim=none (message not signed) header.d=none;cisco.com; dmarc=none action=none header.from=futurewei.com; x-originating-ip: [73.114.233.24] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: 50252981-a668-4eba-122b-08d7f93700c0 x-ms-traffictypediagnostic: MN2PR13MB3391: x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:10000; x-forefront-prvs: 040513D301 x-ms-exchange-senderadcheck: 1 x-microsoft-antispam: BCL:0; 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charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hi Acee, Yes. I am aware of IPRs that apply to this draft, which have been discl= osed in compliance with IETF IPR rules. Best Regards, Huaimo ________________________________ From: Acee Lindem (acee) Sent: Friday, May 15, 2020 3:47 PM To: draft-cc-lsr-flooding-reduction@ietf.org Cc: lsr@ietf.org Subject: Flooding Topology Computation Algorithm - draft-cc-lsr-flooding-re= duction-08 IPR Poll Authors, Are you aware of any IPR that applies to draft-cc-lsr-flooding-reduction-08= .txt. If so, has this IPR been disclosed in compliance with IETF IPR rules (see RFCs 3979, 4879, 3669 and 5378 for more details). If you are listed as a document author or contributor please respond to this email regardless of whether or not you are aware of any relevant IPR. *The response needs to be sent to the LSR WG mailing list.* The document will not advance to the next stage until a response has been received from each author and contributor. If you are on the LSR WG email list but are not listed as an author or contributor, then please explicitly respond only if you are aware of any IPR that has not yet been disclosed in conformance with IETF rules. Thanks, Acee --_000_MN2PR13MB311762FB33AA1D53C9604095F2BA0MN2PR13MB3117namp_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Hi Acee,

    Yes. I am aware of IPRs that apply to this draft, which = have been disclosed in compliance with IETF IPR rules.

Best Regards,
Huaimo
From: Acee Lindem (acee) &l= t;acee@cisco.com>
Sent: Friday, May 15, 2020 3:47 PM
To: draft-cc-lsr-flooding-reduction@ietf.org <draft-cc-lsr-floodi= ng-reduction@ietf.org>
Cc: lsr@ietf.org <lsr@ietf.org>
Subject: Flooding Topology Computation Algorithm - draft-cc-lsr-floo= ding-reduction-08 IPR Poll
 

Authors,

 

Are you aware of any IPR that applies to&n= bsp;draft-cc-lsr-flooding-reduction-08.txt.

 

If so, has this IPR been disclosed in comp= liance with IETF IPR rules 

(see RFCs 3979, 4879, 3669 and 5378 for mo= re details).

 

If you are listed as a document author or = contributor please respond

to this email regardless of whether or not= you are aware of any

relevant IPR. *The response needs to be se= nt to the LSR WG mailing

list.* The document will not advance to th= e next stage until a

response has been received from each autho= r and contributor.

 

If you are on the LSR WG email list but ar= e not listed as an author or

contributor, then please explicitly respon= d only if you are aware of

any IPR that has not yet been disclosed in= conformance with IETF rules.

 

Thanks,

Acee

--_000_MN2PR13MB311762FB33AA1D53C9604095F2BA0MN2PR13MB3117namp_-- From nobody Fri May 15 18:41:50 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 913EF3A0837 for ; Fri, 15 May 2020 18:41:43 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.898 X-Spam-Level: X-Spam-Status: No, score=-1.898 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=unavailable autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=kumari-net.20150623.gappssmtp.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id KxCEJi4ZABtg for ; Fri, 15 May 2020 18:41:39 -0700 (PDT) Received: from mail-lj1-x22a.google.com (mail-lj1-x22a.google.com [IPv6:2a00:1450:4864:20::22a]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 3AE773A0968 for ; Fri, 15 May 2020 18:41:32 -0700 (PDT) Received: by mail-lj1-x22a.google.com with SMTP id v16so99945ljc.8 for ; Fri, 15 May 2020 18:41:32 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kumari-net.20150623.gappssmtp.com; s=20150623; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=8CfVowI+ogaSw7nNd8JoZQxzF1UPIIH3vk7IkotXM0A=; b=zacjwooSPGJJrimebrmUa8K6i8OWpSruBUD4tj+GnaPVzF4Vz4Mzg4mCJBPn+1CoGZ kddWwtL2fhoSJzdSGl+EcIO6ni2sKqIvnwj1DrtOP/xqxLmDjeIyyv1lli37mBJAgbq9 aPrMlEqv5K/EvlNzsENC+NUwnKmxoLdlAkj5HS4oumj4Iu9WO8UazTOmfop3aK7n0HEw HiHZc4IS8KDUEK5Vs9NKQdHQFVnMkU8A7E5mNZDK1S5sUjWPxjRYYrAR4bb3OFJCgTrH 9npV4aFCWwUldLXwIioPfnWxVGc7UyxKi9X7W97y6GGYChUfHVrNjW2ecmfrNzc9VEj4 HHGw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=8CfVowI+ogaSw7nNd8JoZQxzF1UPIIH3vk7IkotXM0A=; b=iBtXvniy2myKNIrhsIuTmT+uqZUuRh2fkzr8DzOpt3vCIYdpmMx9P1AILRv/dKbNFs kj8qYU2FsdhTFu2Cs4wKupNiVK8RrA5S3zmS0lP92YKKL8eLfmn0b7DQuziQFqZ18hiV w1xRKs94WS3hi19m1YNbA6agjd9QJ4TodbntgUhW3Wue+P2awX0W1wVx/tyWjHZhrbIo Fa61RscQLvl/3JifmpCibblsC4gTwVruAvejeVm8Cy052pnUpCw/zjKNkCmgHQEGhlAr jxUDmrYncpmMYnONI78SGcsdejm6VKS+hUWFaAFgrm00Wnrdm+8doclF/ziLl33GnKg6 N8vw== X-Gm-Message-State: AOAM5336NWw+y3oKpIn4TTCkaI1Xsfd/Zd4L94tb1WZkztkxlb6CW1eJ IIESogWMhat5JdS8RlwvqOfNqQPgECNefl0DvYPYQg== X-Google-Smtp-Source: ABdhPJztm4lmfBf1F65vyz+qcmhwcA0I3qrsMQ7yS7rQwnxuMzM9VnQV70CVkMihOUTzsOCpD+DebpJH/mBReqIA45c= X-Received: by 2002:a2e:7610:: with SMTP id r16mr3986502ljc.156.1589593289972; Fri, 15 May 2020 18:41:29 -0700 (PDT) MIME-Version: 1.0 References: <158950595036.5639.14249690264747935521@ietfa.amsl.com> In-Reply-To: From: Warren Kumari Date: Fri, 15 May 2020 21:41:18 -0400 Message-ID: To: "Les Ginsberg (ginsberg)" Cc: "Acee Lindem (acee)" , Alvaro Retana , "Peter Psenak (ppsenak)" , The IESG , "draft-ietf-ospf-mpls-elc@ietf.org" , "lsr-chairs@ietf.org" , "lsr@ietf.org" Content-Type: multipart/alternative; boundary="0000000000006307db05a5ba07b3" Archived-At: Subject: Re: [Lsr] Warren Kumari's No Objection on draft-ietf-ospf-mpls-elc-13: (with COMMENT) X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 16 May 2020 01:41:44 -0000 --0000000000006307db05a5ba07b3 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Fri, May 15, 2020 at 8:07 PM Les Ginsberg (ginsberg) wrote: > Warren =E2=80=93 > > > > The problem I have with your suggestion is that we do not know whether th= e > destination protocol for redistribution even supports the signaling. > > > > I am very supportive of Acee=E2=80=99s characterization of redistribution= as > outside the scope of specification. > > Okey dokey, I=E2=80=99m convinced... Thanks, w > > I think we can say what happens intra-protocol =E2=80=93 but we should st= ay away > from inter-protocol statements. > > > > Les > > > > > > *From:* Lsr *On Behalf Of * Warren Kumari > *Sent:* Friday, May 15, 2020 2:08 PM > *To:* Acee Lindem (acee) > *Cc:* draft-ietf-ospf-mpls-elc@ietf.org; Alvaro Retana < > aretana.ietf@gmail.com>; lsr-chairs@ietf.org; The IESG ; > lsr@ietf.org; Peter Psenak (ppsenak) > *Subject:* Re: [Lsr] Warren Kumari's No Objection on > draft-ietf-ospf-mpls-elc-13: (with COMMENT) > > > > > > > > On Fri, May 15, 2020 at 1:34 PM Acee Lindem (acee) wrote= : > > Hi Warren, > > > > *From: *Warren Kumari > *Date: *Friday, May 15, 2020 at 1:25 PM > *To: *"Peter Psenak (ppsenak)" > *Cc: *The IESG , "draft-ietf-ospf-mpls-elc@ietf.org" < > draft-ietf-ospf-mpls-elc@ietf.org>, "lsr-chairs@ietf.org" < > lsr-chairs@ietf.org>, "lsr@ietf.org" , Acee Lindem < > acee@cisco.com>, Alvaro Retana > *Subject: *Re: Warren Kumari's No Objection on > draft-ietf-ospf-mpls-elc-13: (with COMMENT) > *Resent-From: * > *Resent-To: *Acee Lindem , Yingzhen Qu < > yingzhen.ietf@gmail.com>, Christian Hopps > *Resent-Date: *Friday, May 15, 2020 at 1:25 PM > > > > > > > > On Fri, May 15, 2020 at 7:28 AM Peter Psenak wrote: > > Hi Warren, > > On 15/05/2020 03:25, Warren Kumari via Datatracker wrote: > > Warren Kumari has entered the following ballot position for > > draft-ietf-ospf-mpls-elc-13: No Objection > > > > When responding, please keep the subject line intact and reply to all > > email addresses included in the To and CC lines. (Feel free to cut this > > introductory paragraph, however.) > > > > > > Please refer to > https://www.ietf.org/iesg/statement/discuss-criteria.html > > for more information about IESG DISCUSS and COMMENT positions. > > > > > > The document, along with other ballot positions, can be found here: > > https://datatracker.ietf.org/doc/draft-ietf-ospf-mpls-elc/ > > > > > > > > ---------------------------------------------------------------------- > > COMMENT: > > ---------------------------------------------------------------------- > > > > Nit: =E2=80=9C When an OSPF Autonomous System Boundary Router (ASBR) > redistributes a > > prefix from another instance of the OSPF or from some other protocol, > it > > SHOULD preserve the ELC signaling for the prefix.=E2=80=9C > > > > S/the /OSPF/OSPF/. > > fixed. > > > > thanks! > > > > > > S/for the prefix/for the prefix (if it exists)/ =E2=80=94 some protocol= s will > not have > > / carry the ELC. > > fixed. > > > > thanks! > > > > > > Apologies if I missed it, but I didn=E2=80=99t see discussion on *expor= ting* ELC > into > > other protocols... > > what do you mean by "exporting"? > > > > Sorry -- the above discusses : "When an OSPF Autonomous System Boundary > Router (ASBR) redistributes a prefix ... FROM some other protocol, " > (imports), but presumably you would also like to be able to do "When an > OSPF Autonomous System Boundary Router (ASBR) redistributes a prefix > **INTO** some other protocol, ..." (exports). Yes, the "other protocol" > document should describe this in detail, but I think that it is worth > mentioning the topic here -- we may be helpful for implementers to keep i= n > mind that this may occur, and so the data should be reachable > (likely through the RIB). > > > > Can you suggest some text? Do you realize that in the Routing Area, route > redistribution (aka, route import/export) has always been considered an > implementation matter and is not formally specified. It would hard to > standardize this now (other than Routing Policy YANG model) due to > differences between implementations. > > > > Sure -- how about something like: > > When an OSPF Autonomous System Boundary Router (ASBR) redistributes a > prefix from another instance of the OSPF or from some other protocol, > it SHOULD preserve the ELC signaling for the prefix. > > **In addition ASBRs should allow the > > ELC signaling for the prefix to be preserved when redistributing > to another instance of OSPF or to some other protocol** > > > > (Addition in asterisks). > > Note that this is just a suggestion / not a hill I care to die on -- as a= n > ops person, when I read "you should be able to preserve X when importing > into Y", I automatically start wondering how / if I can preserve X when > exporting from Y. > > > > But, 'm also fine if y'all don't want to address this, > > W > > > > > > > > Thanks, > Acee > > > > W > > > > > thanks, > Peter > > > > > > > > > > > > > > > > -- > > I don't think the execution is relevant when it was obviously a bad idea > in the first place. > This is like putting rabid weasels in your pants, and later expressing > regret at having chosen those particular rabid weasels and that pair of > pants. > ---maf > > > > > -- > > I don't think the execution is relevant when it was obviously a bad idea > in the first place. > This is like putting rabid weasels in your pants, and later expressing > regret at having chosen those particular rabid weasels and that pair of > pants. > ---maf > --=20 I don't think the execution is relevant when it was obviously a bad idea in the first place. This is like putting rabid weasels in your pants, and later expressing regret at having chosen those particular rabid weasels and that pair of pants. ---maf --0000000000006307db05a5ba07b3 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable


On Fri, May 15, 2020 at 8:07 PM Les Ginsberg (ginsberg) <= ;ginsberg@cisco.com> wrote:

Warren =E2=80=93

=C2=A0

The problem I have with your suggestion is that we d= o not know whether the destination protocol for redistribution even support= s the signaling.

=C2=A0

I am very supportive of Acee=E2=80=99s characterizat= ion of redistribution as outside the scope of specification.<= /p>


Okey dokey, I=E2=80=99m convinced...

Thanks, w

=C2=A0

I think we can say what happens intra-protocol =E2= =80=93 but we should stay away from inter-protocol statements.

=C2=A0

=C2=A0=C2=A0 Les

=C2=A0

=C2=A0

From: Lsr <lsr-bounces@ietf.org> On Behalf Of Warren Kumari
Sent: Friday, May 15, 2020 2:08 PM
To: Acee Lindem (acee) <acee@cisco.com>
Cc: draft-ietf-ospf-mpls-elc@ietf.org; Alvaro Retana <aretana.ietf@gmail.com= >; lsr-chairs@i= etf.org; The IESG <iesg@ietf.org>; = lsr@ietf.org; Peter Psenak (ppsenak) <ppsenak@cisco.com>
Subject: Re: [Lsr] Warren Kumari's No Objection on draft-ietf-os= pf-mpls-elc-13: (with COMMENT)

=C2=A0

=C2=A0

=C2=A0

On Fri, May 15, 2020 at 1:34 PM Acee Lindem (acee) &= lt;acee@cisco.com&g= t; wrote:

Hi Warren,

=C2=A0

From: Warren Kumari <warren@kumari.net>
Date: Friday, May 15, 2020 at 1:25 PM
To: "Peter Psenak (ppsenak)" <ppsenak@cisco.com>
Cc: The IESG <= iesg@ietf.org>, "draft-ietf-ospf-mpls-elc@ietf.org" <draft-= ietf-ospf-mpls-elc@ietf.org>, "lsr-chairs@= ietf.org" <lsr-chairs@ietf.org>, "lsr@ietf.org" <lsr@ietf.org>, Acee Lindem <acee@c= isco.com>, Alvaro Retana <aretana.ietf@gmail.com>
Subject: Re: Warren Kumari's No Objection on draft-ietf-ospf-mpl= s-elc-13: (with COMMENT)
Resent-From: <alias-bounces@ietf.org>
Resent-To: Acee Lindem <acee@cisco.com>, Yingzhen Qu <yingzhen.ietf@gmail.com>, Chri= stian Hopps <chop= ps@chopps.org>
Resent-Date: Friday, May 15, 2020 at 1:25 PM

=C2=A0

=C2=A0=

=C2=A0

On Fri, May 15, 2020 at 7:28 AM Peter Psenak <ppsenak@cisco.com> wrote:=

Hi Warren,

On 15/05/2020 03:25, Warren Kumari via Datatracker wrote:
> Warren Kumari has entered the following ballot position for
> draft-ietf-ospf-mpls-elc-13: No Objection
>
> When responding, please keep the subject line intact and reply to all<= br> > email addresses included in the To and CC lines. (Feel free to cut thi= s
> introductory paragraph, however.)
>
>
> Please refer to https://www.ietf.org/iesg/statement/discuss-criteria.html
> for more information about IESG DISCUSS and COMMENT positions.
>
>
> The document, along with other ballot positions, can be found here: > https://datatracker.ietf.org/doc/draft-ietf-ospf-mpls-elc/
>
>
>
> ----------------------------------------------------------------------=
> COMMENT:
> ----------------------------------------------------------------------=
>
> Nit: =E2=80=9C When an OSPF Autonomous System Boundary Router (ASBR) r= edistributes a
> prefix from another instance of the OSPF or from some other protocol,= =C2=A0 =C2=A0it
> SHOULD preserve the ELC signaling for the prefix.=E2=80=9C
>
> S/the /OSPF/OSPF/.

fixed.

=C2=A0

thanks!


>
> S/for the prefix/for the prefix (if it exists)/ =E2=80=94 some protoco= ls will not have
> / carry the ELC.

fixed.

=C2=A0

thanks!


>
> Apologies if I missed it, but I didn=E2=80=99t see discussion on *expo= rting* ELC into
> other protocols...

what do you mean by "exporting"?

=C2=A0

Sorry -- the abo= ve discusses : "When an OSPF Autonomous System Boundary Router (ASBR) redistribut= es a=C2=A0prefix ... FROM some other protocol,=C2=A0 " (imports), but = presumably you would also like to be able to do "When an OSPF Autonomous System = Boundary Router (ASBR) redistributes a=C2=A0prefix **INTO** some other prot= ocol,=C2=A0 ..." (exports). Yes, the "other protocol" docume= nt should describe this in detail, but I think that it is worth mentioning the topic here -- we may be helpful for implementers to keep in= mind that this may occur, and so the data should be reachable (likely=C2= =A0through the RIB).

=C2=A0

Can you suggest some text? Do you realize that in th= e Routing Area, route redistribution (aka, route import/export) has always = been considered an implementation matter and is not formally specified. It would hard to standardize this now (other than Rout= ing Policy YANG model) due to differences between implementations.=C2=A0=

=C2=A0

Sure -- how about something like:

=C2=A0 =C2=A0When an OSPF Autonomous System Boundary= Router (ASBR) redistributes a
=C2=A0 =C2=A0prefix from another instance of the OSPF or from some other pr= otocol,
=C2=A0 =C2=A0it SHOULD preserve the ELC signaling for the prefix.=C2=A0

=C2=A0 **In additi= on ASBRs should allow the

=C2=A0 ELC signali= ng for the prefix to be preserved when redistributing to=C2=A0another insta= nce of OSPF or to some other protocol**

=C2=A0

(Addition in aster= isks).

Note that this is just a suggestion / not a hill I care to die on --= as an ops person, when I read "you should be able to preserve X when = importing into Y", I automatically start wondering how / if I can preserve X when exporting from Y.=C2=A0

=C2=A0

But, 'm also fine if y'all don't want to address this,

W

=C2=A0

=C2=A0

=C2=A0

Thanks,
Acee

=C2=A0

W=

=C2=A0


thanks,
Peter

>
>
>
>
>


=C2=A0

--

I don't think the execution is relevant when it was obviously a bad ide= a in the first place.
This is like putting rabid weasels in your pants, and later expressing regr= et at having chosen those particular rabid weasels and that pair of pants.<= br> =C2=A0 =C2=A0---maf


=C2=A0

--

I don't think the execution is relevant when it = was obviously a bad idea in the first place.
This is like putting rabid weasels in your pants, and later expressing regr= et at having chosen those particular rabid weasels and that pair of pants.<= br> =C2=A0 =C2=A0---maf

--
I don't think the execution is relev= ant when it was obviously a bad idea in the first place.
This is like pu= tting rabid weasels in your pants, and later expressing regret at having ch= osen those particular rabid weasels and that pair of pants.
=C2=A0 =C2= =A0---maf
--0000000000006307db05a5ba07b3-- From nobody Sat May 16 21:36:24 2020 Return-Path: X-Original-To: lsr@ietf.org Delivered-To: lsr@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id 364943A0D42; Sat, 16 May 2020 21:36:22 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: Erik Kline via Datatracker To: "The IESG" Cc: draft-ietf-ospf-mpls-elc@ietf.org, lsr-chairs@ietf.org, lsr@ietf.org, Acee Lindem , aretana.ietf@gmail.com, acee@cisco.com X-Test-IDTracker: no X-IETF-IDTracker: 6.130.0 Auto-Submitted: auto-generated Precedence: bulk Reply-To: Erik Kline Message-ID: <158969018219.30789.6119849985741094254@ietfa.amsl.com> Date: Sat, 16 May 2020 21:36:22 -0700 Archived-At: Subject: [Lsr] Erik Kline's No Objection on draft-ietf-ospf-mpls-elc-13: (with COMMENT) X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 17 May 2020 04:36:22 -0000 Erik Kline has entered the following ballot position for draft-ietf-ospf-mpls-elc-13: No Objection When responding, please keep the subject line intact and reply to all email addresses included in the To and CC lines. (Feel free to cut this introductory paragraph, however.) Please refer to https://www.ietf.org/iesg/statement/discuss-criteria.html for more information about IESG DISCUSS and COMMENT positions. The document, along with other ballot positions, can be found here: https://datatracker.ietf.org/doc/draft-ietf-ospf-mpls-elc/ ---------------------------------------------------------------------- COMMENT: ---------------------------------------------------------------------- [[ nits ]] [ section 1 ] * "(e.g., SR-MPLS" is missing a closing parenthesis [ section 3 ] * "...unless all of its interfaces...":" do management interfaces, or other interfaces over which no forwarding is taking place, count in this definition of "all"? If not, does this text need to be tightened or is this just one of those things all implementers will naturally figure out? (I'm actually betting this is just something readers will intuit.) From nobody Sun May 17 00:23:00 2020 Return-Path: X-Original-To: lsr@ietf.org Delivered-To: lsr@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id 035293A0D43; Sun, 17 May 2020 00:22:55 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: internet-drafts@ietf.org To: Cc: lsr@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 6.130.0 Auto-Submitted: auto-generated Precedence: bulk Reply-To: lsr@ietf.org Message-ID: <158970017497.30427.6463483360286051847@ietfa.amsl.com> Date: Sun, 17 May 2020 00:22:55 -0700 Archived-At: Subject: [Lsr] I-D Action: draft-ietf-lsr-dynamic-flooding-05.txt X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 17 May 2020 07:22:55 -0000 A New Internet-Draft is available from the on-line Internet-Drafts directories. This draft is a work item of the Link State Routing WG of the IETF. Title : Dynamic Flooding on Dense Graphs Authors : Tony Li Peter Psenak Les Ginsberg Huaimo Chen Tony Przygienda Dave Cooper Luay Jalil Srinath Dontula Filename : draft-ietf-lsr-dynamic-flooding-05.txt Pages : 47 Date : 2020-05-17 Abstract: Routing with link state protocols in dense network topologies can result in sub-optimal convergence times due to the overhead associated with flooding. This can be addressed by decreasing the flooding topology so that it is less dense. This document discusses the problem in some depth and an architectural solution. Specific protocol changes for IS-IS, OSPFv2, and OSPFv3 are described in this document. The IETF datatracker status page for this draft is: https://datatracker.ietf.org/doc/draft-ietf-lsr-dynamic-flooding/ There are also htmlized versions available at: https://tools.ietf.org/html/draft-ietf-lsr-dynamic-flooding-05 https://datatracker.ietf.org/doc/html/draft-ietf-lsr-dynamic-flooding-05 A diff from the previous version is available at: https://www.ietf.org/rfcdiff?url2=draft-ietf-lsr-dynamic-flooding-05 Please note that it may take a couple of minutes from the time of submission until the htmlized version and diff are available at tools.ietf.org. Internet-Drafts are also available by anonymous FTP at: ftp://ftp.ietf.org/internet-drafts/ From nobody Sun May 17 02:07:10 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id AD9DC3A0F95 for ; Sun, 17 May 2020 02:07:07 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -0.197 X-Spam-Level: X-Spam-Status: No, score=-0.197 tagged_above=-999 required=5 tests=[DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 8YOPvIN5yChf for ; Sun, 17 May 2020 02:07:03 -0700 (PDT) Received: from mail-io1-xd34.google.com (mail-io1-xd34.google.com [IPv6:2607:f8b0:4864:20::d34]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 4275E3A0F94 for ; Sun, 17 May 2020 02:07:03 -0700 (PDT) Received: by mail-io1-xd34.google.com with SMTP id f4so7301265iov.11 for ; Sun, 17 May 2020 02:07:03 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=yw6TfhzOOlBLntYo0KAgTa3pEp0YchUonv1ObFL7o6M=; b=pPcPij3hMhADf3VierEEhRO+PZ6SkASJcR06i+3E5xDja+WIdIf4/xjY08g0C0IEOL Wl4dSnIW2Y7FHkjWOM54ubvzy9amc/fWEyxKNd+r4ncuQmeBJi2zoXHqq1gyBjApasG0 E4nzTVBzeKk1clfzUOZyEPvHbgGc9d8Q1RktKmGawV1YT0zUnKC3iala/O1CtjzWQcu/ jGSHmQrEq13W+0OmMcljWXns79ZG88d0uVmVvYWd7sor0nsAtskQ37yJinmzk+UQatRy kav5Flig+Z7ShL1x8/19wxAxwh81rp6JkXAJBpMzw96kfqJfw/gQU/q+jQg/qgrmrExw u0Fg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=yw6TfhzOOlBLntYo0KAgTa3pEp0YchUonv1ObFL7o6M=; b=ucAWzkLbTNKaWmiGh7L6jI1GcKBaQnlGnyGuOjR7yq9X+G+kAYaKUEET2PmOreqqba DBoPGhT4YTLa50CmHhJA8RLa2Ox0o9lgq1BZQUTpC3o9YbAwQmsCARwxy+EmOGW1zQnh rmV9+WG1AHqf5AjYQc5wlgm9WlS7T1AqC1vE/7r1CtOUBuEbdUELrGvi2m7diCzKI9zL Q0zEmDJ63RRfP9nhm7cHlDy/FCdGmh3Ij1iiUIvjnvp8fsB4hXJ9qOy4HC3tgNsZ3egM FCSDwOFydLTMdgnmFizROB936qeToAUhbTZWiZjvbtO3n4vBpyA6JiLcmmyvls6DTio4 gBaw== X-Gm-Message-State: AOAM530U5gire52wGHUiUKMVQapHFQFY0FQTcpXgseUxbIJn3DR8xElh O2QRo1kzhpLkhwSF4LDshgLdHCwS8C7LbHOiyt8= X-Google-Smtp-Source: ABdhPJw/CMfTTnYyePuSrR3UZ0cNNzyGkUOqQV+cdVo+Jzfw18rb/nStFoSFB6/jRBxIW8aADPGDf1PTrGxRiyjZQlA= X-Received: by 2002:a6b:5813:: with SMTP id m19mr9626498iob.88.1589706422089; Sun, 17 May 2020 02:07:02 -0700 (PDT) MIME-Version: 1.0 References: <24209_1588692477_5EB185FD_24209_35_1_53C29892C857584299CBF5D05346208A48E3D455@OPEXCAUBM43.corporate.adroot.infra.ftgroup> <6287_1588771252_5EB2B9B4_6287_332_1_53C29892C857584299CBF5D05346208A48E3F698@OPEXCAUBM43.corporate.adroot.infra.ftgroup> <10562_1588775602_5EB2CAB2_10562_251_11_53C29892C857584299CBF5D05346208A48E3FB63@OPEXCAUBM43.corporate.adroot.infra.ftgroup> <87CDE7F3-E08D-4C45-9AF1-9DAD635F8908@chopps.org> <9992_1588784982_5EB2EF56_9992_201_1_53C29892C857584299CBF5D05346208A48E40256@OPEXCAUBM43.corporate.adroot.infra.ftgroup> <6544_1588843052_5EB3D22C_6544_99_1_53C29892C857584299CBF5D05346208A48E415A8@OPEXCAUBM43.corporate.adroot.infra.ftgroup> <26975_1588867353_5EB43119_26975_5_1_53C29892C857584299CBF5D05346208A48E423B4@OPEXCAUBM43.corporate.adroot.infra.ftgroup> In-Reply-To: <26975_1588867353_5EB43119_26975_5_1_53C29892C857584299CBF5D05346208A48E423B4@OPEXCAUBM43.corporate.adroot.infra.ftgroup> From: Gyan Mishra Date: Sun, 17 May 2020 05:06:51 -0400 Message-ID: To: bruno.decraene@orange.com Cc: Christian Hopps , "Les Ginsberg (ginsberg)" , "lsr@ietf.org" Content-Type: multipart/alternative; boundary="00000000000095fc1e05a5d45e4b" Archived-At: Subject: Re: [Lsr] Flooding across a network X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 17 May 2020 09:07:08 -0000 --00000000000095fc1e05a5d45e4b Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Am reading through this thread late but want to chime in on the discussion. Router Isis fast-flood x The concept of ISIS fast flooding has been around for decades and is critical for ISIS LSDB synchronization to so all nodes have all prefixes to avoid micro loops and within the network. The concept of fast flood feature is basically to flood the number of LSPs that need to be flooded before starting the local SPF. So with fast flood enabled all nodes in the domain wait till the last LSP is flooded before it runs its local SPF. By fast flooding it reduces the overall number of SPFs executed and allows the LSDB to be synchronized by all nodes in the domain. Let=E2=80=99s say a link went down or came up topology change. The router = should at a minimum flood at least that LSP that triggered the SPF before running its local SPF. Fast flooding is recommended by all vendors as it improves convergence times and limits duration of LSDB inconsistencies during which time micro loops form. In case where a few routers don=E2=80=99t have fast flood enabled, those f= ew router in slow mode may have to run multiple SPFs before completely being synchronized. I think that question where a mix of slow and fast exist versus all slow or all fast you may have mixed unpredictable behaviors that you really would have to test out in a lab or live network. In my experience I have always had all nodes running fast flood mode as the feature has been around for a long time and recommended for optimal convergence. There are many other parameters with ISIS that come into play to optimize convergence below which may vary by vendor but can improve convergence and minimize micro loops below: One of them is setting all P2P routed links to circuit type point-to-point to avoid DIS election. Both ISIS and OSPF have the iSPF incremental SPF so only the changed part of the tree is updated and not the entire tree to save on SPF processing. With short spf interval and spf delay the local spf May start before the lsp that triggered the spf is flooded. Lsp pacing can be used to speed up end to end flooding. Hello padding TLV 8 for MTU defection to help with convergence so max number of LSPs can be sent during flooding. Increase lsp lifetime to maximum to reduce control traffic so cpu can be optimized to refresh lsp=E2=80=99s Reduce the frequency of periodic lsp flooding of topology to reduce link utilization by Isis Ignore lsp errors instead of purging them Carful balance of event processing and throttling of events to maximize convergence times Prefix prioritization on critical prefixes such as MPLS FEC binding. LFA and RLFA for pre computed backup paths BFD for ms failure detection Overall Isis as far as scalability far exceeds ospf with stability with domains with a very large number of nodes in the 100s and high number of adjacencies per node. As far as stability and convergence both ospf and Isis are equivalent from my experience. Kind regards Gyan Verizon On Thu, May 7, 2020 at 12:03 PM wrote: > Les, > > > > > > *From:* Les Ginsberg (ginsberg) [mailto:ginsberg@cisco.com] > *Sent:* Thursday, May 7, 2020 4:55 PM > *To:* DECRAENE Bruno TGI/OLN > *Cc:* lsr@ietf.org; Christian Hopps > *Subject:* RE: [Lsr] Flooding across a network > > > > Bruno =E2=80=93 > > > > I have specifically used an example where =E2=80=9Cmicroloop avoidance=E2= =80=9D is not > applicable. So I did not want to use the term =E2=80=9Cmicroloop=E2=80=9D= but rather used > =E2=80=9Cloop=E2=80=9D so as not to suggest that =E2=80=9Cmicroloop avoid= ance=E2=80=9D is a potential > solution for the sub-optimal behavior. > > [Bruno] I=E2=80=99m not sure what you mean exactly by =E2=80=9Cmicroloop = avoidance=E2=80=9D. > > On my side, I mean =E2=80=9CLoop avoidance using Segment Routing=E2=80=9D= [1] which _*is*_ > applicable. (Note that I=E2=80=99m not saying that all _*implementations*= _ cover > all cases.) > > [1] > https://tools.ietf.org/html/draft-bashandy-rtgwg-segment-routing-uloop-08 > > > > > > Hope you can appreciate that point. > > > > It would be easy enough to include more nodes in the topology which only > support slow flooding. The end result would be the same. > > [Bruno] The question is whether the activation of fast flooding on one > (some) node(s)/IGP adjacency(es) may result in delaying the LSDB > synchronization network wide. It=E2=80=99s not about the number of slow n= odes. > > > > You seem to assume that we have a majority of fast nodes, and some > remaining slow nodes. In which cases I agree that in some cases the > overall/network wide behavior may be a slow LSDB sync. But not slower tha= n > with slow nodes only. > > I have kept the example simple in the hopes we could more easily agree > that what I describe can happen when not all nodes support faster floodin= g > =E2=80=93 which is the only point I am trying to make. > > [Bruno] If your point is that while we have slow nodes in the network, in > some cases the network wide behavior can be =E2=80=9Cslow=E2=80=9D, somew= here between =E2=80=9Call > nodes are fast=E2=80=9D and =E2=80=9Call nodes are slow=E2=80=9D, then I = agree with you. > > > > However what you said is: =E2=80=9Cwhen only some nodes in the network su= pport > faster flooding [=E2=80=A6] it prolongs the period of LSDB inconsistency= .=E2=80=9D > > In that sentence, I disagree with =E2=80=9Cprolongs=E2=80=9D which accord= ing to 2 > dictionaries means =E2=80=9Clasting longer=E2=80=9D. > > https://dictionary.cambridge.org/fr/dictionnaire/anglais/prolong > > https://www.merriam-webster.com/dictionary/prolong > > > > Because, at least to me, this reads as =E2=80=9CThe introduction of fast-= flooding > nodes in the network (may) increase the period of LSDB inconsistency.=E2= =80=9D > > > > Whether the ratio of Fast/Slow nodes is large or small or about the same > doesn=E2=80=99t eliminate the possibility that the same behavior could be= seen =E2=80=93 > though it might alter the location of the topology change which would be > problematic. > > > > From an operator=E2=80=99s POV, I am pretty sure that what you really car= e about > is whether packets get successfully forwarded or not. > > [Bruno] Yes, but let=E2=80=99s not combine multiple (complex) problems. > > Here I=E2=80=99d like we focus on LSP flooding and LSDB synchronization a= cross the > network. Plus this is exactly the point that you raised: =E2=80=9Cincreas= e the > period of LSDB inconsistency.=E2=80=9D > > > > I am demonstrating that it isn=E2=80=99t safe to assume forwarding behavi= or will > be optimal when not all nodes support fast flooding. > > [Bruno] Which is very different from your original point =E2=80=9Cwhen on= ly some > nodes in the network support faster flooding [=E2=80=A6] it prolongs the= period > of LSDB inconsistency.=E2=80=9D > > > > --Bruno > > > > Les > > > > > > *From:* bruno.decraene@orange.com > *Sent:* Thursday, May 07, 2020 2:18 AM > *To:* Les Ginsberg (ginsberg) > *Cc:* lsr@ietf.org; Christian Hopps > *Subject:* RE: [Lsr] Flooding across a network > > > > Les, > > > > > From: Les Ginsberg (ginsberg) [mailto:ginsberg@cisco.com > ] > > > > > > Bruno - > > > > > > I am sorry it has been so difficult for us to understand each other. I > am trying my best. > > +1 +1 > > > > > Look at it this way: > > > > > > You are the customer. =F0=9F=98=8A > > > I am the vendor. > > > > I'm not sure what (technical) point you are trying to make. > > > > Coming back to your statement : =E2=80=9Cwhen only some nodes in the netw= ork > support faster flooding [=E2=80=A6] it prolongs the period of LSDB incon= sistency > .=E2=80=9D > > Your example is flawed on two points: > > - Your performance indicator is "micro loop duration", while we are > talking about the duration of LSP flooding across the network. So the > metric should be "LSP flooding time" (or "period of LSDB inconsistency") > > - Your example is about one node doing slower flooding, while we are > interested in the case when one node support faster flooding. (It's quite > clear that if one node is slower, the end to end flooding time may be > longer. The point you are raising is when one node is doing faster floodi= ng) > > > > Can you fix your example on those 2 points? > > > > Thanks > > --Bruno > > > > > > > The failure scenario I describe below happens and you notice that all > Northbound destinations loop for 35 seconds whenever fast flooding is > enabled. > > > I think you are going to complain about this - to me. =F0=9F=98=8A > > > > > > And I am going to tell you that this is a consequence of enabling fast > flooding in the presence of a node which does not support it. Your option= s > to reduce the period of looping will be: > > > > > > 1)Upgrade the slow node to support faster flooding > > > 2)Disable fast flooding > > > 3)Redesign your network > > > > > > Les > > > > > > > -----Original Message----- > > > > From: bruno.decraene@orange.com > > > > Sent: Wednesday, May 06, 2020 10:10 AM > > > > To: Christian Hopps > > > > Cc: Les Ginsberg (ginsberg) ; lsr@ietf.org > > > > Subject: RE: [Lsr] Flooding across a network > > > > > > > > > From: Christian Hopps [mailto:chopps@chopps.org = ] > > > > > > > > > > Bruno persistence has made me realize something fundamental here. > > > > > > > > > > The minute the LSP originator changes the LSP and floods it you hav= e > LSDB > > > > inconsistency. > > > > > > > > Exactly my point. Thank you Chris. > > > > I would even say: "The minute the LSP originator changes the LSP then > you > > > > have LSDB inconsistency." But no big deal if there is disagreement on > this > > > > detail. > > > > > > > > > That is going to last until the last node in the network has update= d > it's LSDB. > > > > > > > > Absolutely. > > > > So the faster we flood, the shorter the LSBD inconsistency. > > > > > > > > Now IMO, even if a single/few nodes flood faster, there is a chance o= f > > > > shortening the LSDB inconsistency. But in all cases, I don't see how > this could > > > > make the LSDB inconsistency longer. > > > > > > > > > > > > > Les is pointing out that LSDB inconsistency can be bad in certain > > > > circumstances e.g., if a critical node is slow and thus inconsistent. > > > > > > > > > > I believe the right way to fix this is a simple one, help the > operator flag the > > > > broken router software/hardware for replacement, but otherwise IS-IS > > > > should just try to do the best job it can do to which is to flood > around the > > > > problem (i.e., flood as optimally as possible). > > > > > > > > +1 > > > > On a side note, I would not call a router flooding slowly as "broken"= . > I find it > > > > understandable that in a given network there are different type of > routers > > > > (core vs aggregation), different roles (P having 50 IGP adjacencies > with 50 PEs > > > > vs PE having only 2 IGP adjacencies with 2 P), different hardware > > > > generations, different software, different vendors with different > > > > perspectives/markets. > > > > > > > > Thank you Chris. > > > > > > > > --Bruno > > > > > > > > > > Thanks, > > > > > Chris. > > > > > [as WG member] > > > > > > > > > > > > > > > > On May 6, 2020, at 10:33 AM, bruno.decraene@orange.com wrote: > > > > > > > > > > > > Les, > > > > > > > > > > > > From: Les Ginsberg (ginsberg) [mailto:ginsberg@cisco.com > ] > > > > > > Sent: Wednesday, May 6, 2020 4:14 PM > > > > > > To: DECRAENE Bruno TGI/OLN > > > > > > Cc: lsr@ietf.org > > > > > > Subject: RE: Flooding across a network > > > > > > > > > > > > Bruno =E2=80=93 > > > > > > > > > > > > I am somewhat at a loss to understand your comments. > > > > > > The example is straightforward and does not need to consider FIB > update > > > > time nor the ordering of prefix updates on different nodes. > > > > > > [Bruno] The example is straightforward but you are referring to > FIB and IP > > > > packets forwarding as per those FIBs. > > > > > > I=E2=80=99d like we focus on LSP flooding and LSDB consistency. > > > > > > > > > > > > Consider the state of Node B and Node D at various time points > from the > > > > trigger event. > > > > > > > > > > > > T+ 2 seconds: > > > > > > ----------------- > > > > > > B has received all LSP Updates. It triggers an SPF and for all > Northbound > > > > destinations previously reachable via C it installs paths via D. > > > > > > Let=E2=80=99s assume it take 5 seconds to update the forwarding p= lane. > > > > > > > > > > > > D has received 40 of the 1000 LSP updates. It triggers an SPF and > finds > > > > that all Northbound destinations are reachable via B-C. It makes no > changes > > > > to the forwarding plane. > > > > > > > > > > > > T+7 seconds > > > > > > ----------------- > > > > > > B has completed FIB updates. Traffic to all Northbound > destinations is > > > > being forwarded via D. > > > > > > > > > > > > D has now received 140 of the 1000 LSP updates. Entries in its > forwarding > > > > plane for Northbound destinations still point to B. > > > > > > > > > > > > We have a loop. > > > > > > > > > > > > T + 30 seconds > > > > > > -------------------- > > > > > > D has now received 600 of the 1000 LSP updates. Still no changes > to its > > > > forwarding plane. > > > > > > Traffic to Northbound destinations is still looping. > > > > > > > > > > > > T+ 50 seconds > > > > > > ------------------- > > > > > > D has finally received all 1000 LSP updates.. > > > > > > It triggers (another) SPF and calculates paths to Northbound > destinations > > > > via E. It begins to update its forwarding plane. > > > > > > Let=E2=80=99s assume this will take 5 seconds.. > > > > > > > > > > > > T + 55 seconds > > > > > > -------------------- > > > > > > D has completed forwarding plane updates =E2=80=93 no more loopin= g. > > > > > > > > > > > > That is all I am trying to illustrate. > > > > > > > > > > > > If you want to start arguing that node protecting LFAs + microloo= p > > > > avoidance could help (NOTE I explicitly took those out of the exampl= e > for > > > > simplicity) =E2=80=93 it is easy enough to change the example to incl= ude > multiple node > > > > failures or a node failure plus some northbound link failures on othe= r > nodes. > > > > > > [Bruno] I=E2=80=99m not talking about LFA/FRR. And with regards t= o > microloops > > > > avoidance, some algorithms can handle any graph transition so includi= ng > > > > multiple node failures. > > > > > > > > > > > > But again, let=E2=80=99s stick to LSP flooding and LSDB consisten= cy. (you > are the > > > > one speaking about microloops in the forwarding plane). > > > > > > > > > > > > The point here is to look at the impact of long-lived LSDB > inconsistency > > > > which results when some nodes support flooding an order of magnitude > > > > faster flooding than other nodes =E2=80=93 which is what you asked me= to > clarify. > > > > > > [Bruno] No. I asked you to clarify why having a node with faster > flooding > > > > could prolongs the period of LSDB inconsistency. > > > > > > > > > > > > Again, with you own words: =E2=80=9Cwhen only some nodes in the n= etwork > > > > support faster flooding the behavior of the whole network may not be > > > > "better" when faster flooding is enabled because it prolongs the > period of > > > > LSDB inconsistency.=E2=80=9D > > > > > > And with less words: =E2=80=9Cwhen only some nodes in the network= support > > > > faster flooding [=E2=80=A6] it prolongs the period of LSDB inconsist= ency.=E2=80=9D > > > > > > > > > > > > --Bruno > > > > > > > > > > > > Les > > > > > > > > > > > > > > > > > > > > > > > > From: bruno.decraene@orange.com > > > > > > Sent: Wednesday, May 06, 2020 6:21 AM > > > > > > To: Les Ginsberg (ginsberg) > > > > > > Cc: lsr@ietf.org > > > > > > Subject: RE: Flooding across a network > > > > > > > > > > > > Les, > > > > > > > > > > > > From: Les Ginsberg (ginsberg) [mailto:ginsberg@cisco.com > ] > > > > > > Sent: Wednesday, May 6, 2020 1:35 AM > > > > > > To: DECRAENE Bruno TGI/OLN; lsr@ietf..org > > > > > > Subject: RE: Flooding across a network > > > > > > > > > > > > Bruno - > > > > > > > > > > > > Seems like it was not too long ago that we were discussing this i= n > person. > > > > Ahhh...the good old days... > > > > > > [Bruno] Indeed, may be not to the point of concluding. Indeed. > > > > > > > > > > > > First, let's agree that the interesting case does not involve 1 o= r > even a > > > > small number of LSPs. For those cases flooding speed does not matter. > > > > > > The interesting cases involve a large number of LSPs (hundreds or > > > > thousands). And in such cases LFA/microloop avoidance techniques are > not > > > > applicable. > > > > > > > > > > > > Take the following simple topology: > > > > > > > > > > > > | | ... | | > > > > > > +---+ +---+ > > > > > > | C | | E | > > > > > > +---+ +---+ > > > > > > | | 1000 > > > > > > +---+ +---+ > > > > > > | B |-------------| D | > > > > > > +---+ 1000 +---+ > > > > > > | | > > > > > > | | > > > > > > \ / > > > > > > \ / > > > > > > \ / > > > > > > \ / > > > > > > +---+ > > > > > > | A | > > > > > > +---+ > > > > > > > > > > > > There is a topology northbound of C and E (not shown) and a > topology > > > > southbound of A (not shown). > > > > > > Cost on all links is 10 except B-D and D-E where cost is high. > > > > > > > > > > > > C is a node with 1000 neighbors. > > > > > > When all links are up, shortest path for all northbound > destinations is via > > > > C. > > > > > > All nodes in the network support fast flooding except for Node D. > > > > > > Let=E2=80=99s say fast flooding is 500 LSPs/second and slow flood= ing (Node > D) is 20 > > > > LSPs/seconds. > > > > > > If Node C fails we have 1000 LSPs to flood. > > > > > > All nodes except for D can receive these in 2 seconds (plus > internode > > > > delay time). > > > > > > D can receive LSPs in 50 seconds. > > > > > > > > > > > > [Bruno] Thanks for your example. Agreed so far. > > > > > > > > > > > > When A and B and all southbound nodes receive/process the LSP > > > > updates they will start sending traffic to Northbound destinations vi= a > D. > > > > > > But for the better part of 50 seconds, Node D has yet to receive > all LSP > > > > updates and still believes that shortest path is via B-C. It will loo= p > traffic. > > > > > > > > > > > > [Bruno] May I remind you that we are discussing IS-IS flooding in > order to > > > > sync LSDB (LSP database). That is already a big enough subject. It > does not > > > > including FIB (updates), nor IP forwarding. > > > > > > > > > > > > Quoting you =E2=80=9Cwhen only some nodes in the network support = faster > > > > flooding the behavior of the whole network may not be "better" when > faster > > > > flooding is enabled because it prolongs the period of LSDB > inconsistency.=E2=80=9D > > > > > > > > > > > > Taking your own examples, in both cases (all nodes support fast > flooding; > > > > all nodes but D support fast flooding) the period of LSDB > inconsistency is 50 > > > > seconds. Hence this example does not illustrate your statement. > > > > > > > > > > > > Hence I=E2=80=99m restating my questions: > > > > > > > > > > > > > > when only some nodes in the network support faster flooding t= he > > > > behavior > > > > > > > of the whole network may not be "better" when faster flooding i= s > > > > enabled > > > > > > > because it prolongs the period of LSDB inconsistency. > > > > > > > > > > > > > > 1) Do you have data on this? > > > > > > > > > > > > > > 2) If not, can you provide an example where increasing the > flooding > > > > rate on > > > > > > > one adjacency prolongs the period of LSDB inconsistency across > the > > > > > > > network? > > > > > > > > > > > > > > > > > > Had all nodes used slow flooding, it still would have taken 50 > seconds to > > > > converge, but there would be significantly less looping. There could > be a > > > > good amount of blackholing, but this is preferable to looping. > > > > > > [Bruno] You are using an example where ordering FIB updates acros= s > the > > > > network, e.g. as per [1], allows to reduce _FIB_ inconsistency across > the > > > > path/network. And you seem to conclude from this that this translates > to > > > > LSDB update ordering. Those are two different things. In this thread, > I=E2=80=99d > > > > suggest that we focus on IGP flooding and LSDB sync only. (*) > > > > > > [1] https://tools.ietf.org/html/rfc6976 > > > > > > (*) We can discuss loop free IGP converge in a different thread i= f > you > > > > want. IMO, the use of segment routing/source routing is better than > oFIB. > > > > But at some point, it still relies on fast flooding when multiple LSP= s > are > > > > involved. (and I mean _fast_ not _ordered_) > > > > > > > > > > > > --Bruno > > > > > > > > > > > > One can always come up with examples =E2=80=93 based on a specifi= c topology > > > > and a specific failure - where things might be better/worse/unchanged > in the > > > > face of inconsistent flooding speed support. > > > > > > But I hope this simple example illustrates the pitfalls. > > > > > > > > > > > > Les > > > > > > > > > > > > > -----Original Message----- > > > > > > > From: bruno.decraene@orange.com > > > > > > > Sent: Tuesday, May 05, 2020 8:28 AM > > > > > > > To: Les Ginsberg (ginsberg) ; lsr@ietf.org > > > > > > > Subject: Flooding across a network > > > > > > > > > > > > > > Les, > > > > > > > > > > > > > > > From: Lsr [mailto:lsr-bounces@ietf.org = ] > On Behalf Of Les Ginsberg > > > > > > > (ginsberg) > > > > > > > > Sent: Monday, May 4, 2020 4:39 PM > > > > > > > [...] > > > > > > > > when only some nodes in the network support faster flooding t= he > > > > behavior > > > > > > > of the whole network may not be "better" when faster flooding i= s > > > > enabled > > > > > > > because it prolongs the period of LSDB inconsistency. > > > > > > > > > > > > > > 1) Do you have data on this? > > > > > > > > > > > > > > 2) If not, can you provide an example where increasing the > flooding > > > > rate on > > > > > > > one adjacency prolongs the period of LSDB inconsistency across > the > > > > > > > network? > > > > > > > > > > > > > > 3) In the meantime, let's try the theoretical analysis on a > simple > > > > scenario > > > > > > > where a single LSP needs to be flooded across the network. > > > > > > > > > > > > > > - Let's call Dij the time needed to flood the LSP from node i t= o > the > > > > adjacent > > > > > > > node j. Clearly Dij>0. > > > > > > > - Let's call k the node originating this LSP at t0=3D0s > > > > > > > > > > > > > > >From t0, the LSDB is inconsistent across the network as all > nodes but k > > > > are > > > > > > > missing the LSP and hence only know about the 'old' topology. > > > > > > > > > > > > > > Let's call SPT(k) the SPT rooted on k, using Dij as the metric > between > > > > > > > adjacent nodes i and j. Let's call SP(k,i) the shortest path > from k to i; and > > > > > > > D(k,i) the shortest distance between k and i. > > > > > > > > > > > > > > It seems that the time needed: > > > > > > > - for node j to learn about the LSP, and get in sync with k, is > D(k,j) > > > > > > > --=20 Gyan Mishra Network Engineering & Technology Verizon Silver Spring, MD 20904 Phone: 301 502-1347 Email: gyan.s.mishra@verizon.com --00000000000095fc1e05a5d45e4b Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable

Am reading through this thread late but wa= nt to chime in on the discussion.

Router Isis=C2=A0
fast-flood x

The concept of ISIS fast flooding h= as been around for decades and is critical for ISIS LSDB synchronization to= so all nodes have all prefixes to avoid micro loops and within the network= . =C2=A0

The concept of = fast flood feature is basically to flood the number of LSPs that need to be= flooded before starting the local SPF.=C2=A0 So with fast flood enabled al= l nodes in the domain wait till the last LSP is flooded before it runs its = local SPF.=C2=A0 By fast flooding it reduces the overall number of SPFs exe= cuted and allows the LSDB to be synchronized by all nodes in the domain.

Let=E2=80=99s say a link w= ent down or came up topology change.=C2=A0 The router should at a minimum f= lood at least that LSP that triggered the SPF before running its local SPF.= =C2=A0 Fast flooding is recommended by all vendors as it improves convergen= ce times and limits duration of LSDB inconsistencies during which time =C2= =A0micro loops form.

In = case where a few routers don=E2=80=99t have fast flood enabled, those =C2= =A0few router in slow mode may have to run multiple SPFs before completely = being synchronized.=C2=A0 I think that question where a mix of slow and fas= t exist versus all slow or all fast you may have mixed unpredictable behavi= ors that you really would have to test out in a lab or live network.
<= div dir=3D"auto">
In my experience I have always= had all nodes running fast flood mode as the feature has been around for a= long time and recommended for optimal convergence.
=
There are many other parameters with ISIS that = come into play to optimize convergence below which may vary by vendor but c= an improve convergence and minimize micro loops below:

One of them is setting all P2P routed links = to circuit type point-to-point to avoid DIS election.

Both ISIS and OSPF have the iSPF incremental = SPF so only the changed part of the tree is updated and not the entire tree= to save on SPF processing.

With short spf interval and spf delay the local spf May start before th= e lsp that triggered the spf is flooded.

<= div dir=3D"auto">Lsp pacing can be used to speed up end to end flooding.

Hello padding TLV 8 for MT= U defection to help with convergence so max number of LSPs can be sent duri= ng flooding.

Increase ls= p lifetime to maximum to reduce control traffic so cpu can be optimized to = refresh lsp=E2=80=99s

Re= duce the frequency of periodic lsp flooding of topology to reduce link util= ization by Isis=C2=A0

Ig= nore lsp errors instead of purging them=C2=A0

Carful balance of event processing and throttling of = events to maximize convergence times=C2=A0

Prefix prioritization on critical prefixes such as MPLS = FEC binding.

LFA and RLF= A for pre computed backup paths=C2=A0

BFD for ms failure detection=C2=A0
Overall Isis as far as scalability far exceeds osp= f with stability with domains with a very large number of nodes in the 100s= and high number of adjacencies per node. =C2=A0
As far as stability and convergence both ospf and = Isis are equivalent from my experience.

Kind regards=C2=A0

Gyan
Verizon=C2=A0

On Thu, May 7, 202= 0 at 12:03 PM <bruno.decrae= ne@orange.com> wrote:

Les,<= /u>

=C2=A0

=C2=A0

From: Les Ginsberg (ginsberg) [mailto:ginsberg@cisco.com]
Sent: Thursday, May 7, 2020 = 4:55 PM
To: DECRAENE Bruno TGI/OLN Cc: lsr@ietf.= org; Christian Hopps
Subject: RE: [Lsr] Flooding = across a network

=C2=A0

Br= uno =E2=80=93

=C2=A0

I = have specifically used an example where =E2=80=9Cmicroloop avoidance=E2=80= =9D is not applicable. So I did not want to use the term =E2=80=9Cmicroloop= =E2=80=9D but rather used =E2=80=9Cloop=E2=80=9D so as not to suggest that =E2=80=9Cmicroloop avoidance=E2=80=9D is a potential s= olution for the sub-optimal behavior.

= [Bruno] I=E2=80=99m not sure what you mean exactly by =E2=80=9Cmicroloop avoidance=E2=80=9D.

= On my side, I mean =E2=80=9CLoop avoidance using Segment Routing=E2=80=9D [= 1] which _is_ applicable. (Note that I=E2=80=99m not saying that all _implementations= _ cover all cases.)

= [1] =C2=A0https://tools.ietf.org/html= /draft-bashandy-rtgwg-segment-routing-uloop-08

= =C2=A0

= =C2=A0

Ho= pe you can appreciate that point.

=C2=A0

It= would be easy enough to include more nodes in the topology which only supp= ort slow flooding. The end result would be the same.

= [Bruno] The question is whether the activation of fast flooding on one (som= e) node(s)/IGP adjacency(es) may result in delaying the LSDB synchronization network wide. It=E2=80= =99s not about the number of slow nodes.

= =C2=A0

= You seem to assume that we have a majority of fast nodes, and some remainin= g slow nodes. In which cases I agree that in some cases the overall/network = wide behavior may be a slow LSDB sync. But not slower than with slow nodes = only.

I = have kept the example simple in the hopes we could more easily agree that w= hat I describe can happen when not all nodes support faster flooding =E2=80= =93 which is the only point I am trying to make.

= [Bruno] If your point is that while we have slow nodes in the network, in some cases the network wide behavior can be =E2=80=9Cslow=E2=80=9D, somewh= ere between =E2=80=9Call nodes are fast=E2=80=9D and =E2=80=9Call nodes are= slow=E2=80=9D, then I agree with you.

= =C2=A0

= However what you said is: =E2=80=9Cwhen only some nodes in the network supp= ort faster flooding [=E2=80=A6]=C2=A0 it prolongs the period of LSDB inc= onsistency.=E2=80=9D

= In that sentence, I disagree with =E2=80=9Cprolongs=E2=80=9D which accordin= g to 2 dictionaries means =E2=80=9Clasting longer=E2=80=9D.

= https://dictionary.cambridge.org/fr/dictionnaire/anglai= s/prolong

= https://www.merriam-webster.com/dictionary/prolong<= /span>

= =C2=A0

= Because, at least to me, this reads as =E2=80=9CThe introduction of fast-fl= ooding nodes in the network (may) increase the period of LSDB inconsistency.=E2= =80=9D

= =C2=A0

Wh= ether the ratio of Fast/Slow nodes is large or small or about the same does= n=E2=80=99t eliminate the possibility that the same behavior could be seen = =E2=80=93 though it might alter the location of the topology change which would be problematic.

=C2=A0

Fr= om an operator=E2=80=99s POV, I am pretty sure that what you really care ab= out is whether packets get successfully forwarded or not.

[B= runo] Yes, but let=E2=80=99s not combine multiple (complex) problems.<= /u>

= Here I=E2=80=99d like we focus on LSP flooding and LSDB synchronization acr= oss the network. Plus this is exactly the point that you raised: =E2=80=9Cincrease= the period of LSDB inconsistency.=E2=80=9D

= =C2=A0

I = am demonstrating that it isn=E2=80=99t safe to assume forwarding behavior w= ill be optimal when not all nodes support fast flooding.

= [Bruno] Which is very different from your original point =E2=80=9Cwhen only= some nodes in the network support faster flooding [=E2=80=A6]=C2=A0 it prolongs the period of LSDB inconsistency.=E2=80=9D=

= =C2=A0

= --Bruno

=C2=A0

= =C2=A0=C2=A0 Les

=C2=A0

=C2=A0

=C2=A0

Les,

=C2=A0

> From: Les Ginsberg (ginsberg) [mailto:ginsberg@cisco.com]

>

> Bruno -

>

> I am sorry it has been so difficult for us to u= nderstand each other. I am trying my best.

+1 +1

=C2=A0

> Look at it this way:

>

> You are the customer. = =F0=9F=98=8A

> I am the vendor.

=C2=A0

I'm not sure what (technical) point you are tryi= ng to make.

=C2=A0

Coming back to your statement : =E2=80=9Cwhen only some nodes in the network suppor= t faster flooding [=E2=80=A6]=C2=A0 it prolongs the period of LSDB inconsistency.=E2=80=9D

Your example is flawed on two points:<= /span>

- Your performance indicator is "micro loop dur= ation", while we are talking about the duration of LSP flooding across= the network. So the metric should be "LSP flooding time" (or "period of LSDB inconsistency")

- Your example is about one node doing slower floodi= ng, while we are interested in the case when one node support faster= flooding. (It's quite clear that if one node is slower, the end= to end flooding time may be longer. The point you are raising is when one = node is doing faster flooding)

=C2=A0

Can you fix your example on those 2 points?

=C2=A0

Thanks

--Bruno

=C2=A0

=C2=A0

> The failure scenario I describe below happens a= nd you notice that all Northbound destinations loop for 35 seconds whenever= fast flooding is enabled.

> I think you are going to complain about this - = to me. = =F0=9F=98=8A

>

> And I am going to tell you that this is a conse= quence of enabling fast flooding in the presence of a node which does not s= upport it. Your options to reduce the period of looping will be:

>

> 1)Upgrade the slow node to support faster flood= ing

> 2)Disable fast flooding

> 3)Redesign your network

>

=C2=A0=C2=A0=C2=A0=C2=A0> Les

>

> > -----Original Message-----

> > From: bruno.decraene@orange.com <bruno.decraene@orange.com>

> > Sent: Wednesday, May 06, 2020 10:10 AM<= /u>

> > To: Christian Hopps <chopps@chopps.org>

> > Cc: Les Ginsberg (ginsberg) <ginsberg@cisco.com>; lsr@ietf.org

> > Subject: RE: [Lsr] Flooding across a netwo= rk

> >

> > > From: Christian Hopps [mailto:chopps@chopps.org]

> > >

> > > Bruno persistence has made me realize= something fundamental here.

> > >

> > > The minute the LSP originator changes= the LSP and floods it you have LSDB

> > inconsistency.

> >

> > Exactly my point. Thank you Chris.<= u>

> > I would even say: "The minute the LSP= originator changes the LSP then you

> > have LSDB inconsistency." But no big = deal if there is disagreement on this

> > detail.

> >

> > > That is going to last until the last = node in the network has updated it's LSDB.

> >

> > Absolutely.

> > So the faster we flood, the shorter the LS= BD inconsistency.

> >

> > Now IMO, even if a single/few nodes flood = faster, there is a chance of

> > shortening the LSDB inconsistency. But in = all cases, I don't see how this could

> > make the LSDB inconsistency longer.=

> >

> >

> > > Les is pointing out that LSDB inconsi= stency can be bad in certain

> > circumstances e.g., if a critical node is = slow and thus inconsistent.

> > >

> > > I believe the right way to fix this i= s a simple one, help the operator flag the

> > broken router software/hardware for replac= ement, but otherwise IS-IS

> > should just try to do the best job it can = do to which is to flood around the

> > problem (i.e., flood as optimally as possi= ble).

> >

> > +1

> > On a side note, I would not call a router = flooding slowly as "broken". I find it

> > understandable that in a given network the= re are different type of routers

> > (core vs aggregation), different roles (P = having 50 IGP adjacencies with 50 PEs

> > vs PE having only 2 IGP adjacencies with 2= P), different hardware

> > generations, different software, different= vendors with different

> > perspectives/markets.=

> >

> > Thank you Chris.

> >

> > --Bruno

> > >

> > > Thanks,

> > > Chris.

> > > [as WG member]

> > >

> > >

> > > > On May 6, 2020, at 10:33 AM, bruno.decrae= ne@orange.com wrote:

> > > >

> > > > Les,

> > > >

> > > > From: Les Ginsberg (ginsberg) [<= a href=3D"mailto:ginsberg@cisco.com" target=3D"_blank">mailto:ginsberg@cisc= o.com]

> > > > Sent: Wednesday, May 6, 2020 4:1= 4 PM

> > > > To: DECRAENE Bruno TGI/OLN

> > > > Cc: lsr@ietf.org

> > > > Subject: RE: Flooding across a n= etwork

> > > >

> > > > Bruno =E2=80=93

> > > >

> > > > I am somewhat at a loss to under= stand your comments.

> > > > The example is straightforward a= nd does not need to consider FIB update

> > time nor the ordering of prefix updates on= different nodes.

> > > > [Bruno] The example is straightf= orward but you are referring to FIB and IP

> > packets forwarding as per those FIBs.

> > > > I=E2=80=99d like we focus on LSP= flooding and LSDB consistency.

> > > >

> > > > Consider the state of Node B and= Node D at various time points from the

> > trigger event.

> > > >

> > > > T+ 2 seconds:

> > > > -----------------<= /span>

> > > > B has received all LSP Updates. = It triggers an SPF and for all Northbound

> > destinations previously reachable via C it= installs paths via D.

> > > > Let=E2=80=99s assume it take 5 s= econds to update the forwarding plane.

> > > >

> > > > D has received 40 of the 1000 LS= P updates. It triggers an SPF and finds

> > that all Northbound destinations are reach= able via B-C. It makes no changes

> > to the forwarding plane.

> > > >

> > > > T+7 seconds=

> > > > -----------------<= /span>

> > > > B has completed FIB updates. Tra= ffic to all Northbound destinations is

> > being forwarded via D.

> > > >

> > > > D has now received 140 of the 10= 00 LSP updates. Entries in its forwarding

> > plane for Northbound destinations still po= int to B.

> > > >

> > > > We have a loop.

> > > >

> > > > T + 30 seconds

> > > > --------------------

> > > > D has now received 600 of the 10= 00 LSP updates. Still no changes to its

> > forwarding plane.

> > > > Traffic to Northbound destinatio= ns is still looping.

> > > >

> > > > T+ 50 seconds

> > > > -------------------

> > > > D has finally received all 1000 = LSP updates..

> > > > It triggers (another) SPF and ca= lculates paths to Northbound destinations

> > via E. It begins to update its forwarding = plane.

> > > > Let=E2=80=99s assume this will t= ake 5 seconds..

> > > >

> > > > T + 55 seconds

> > > > --------------------

> > > > D has completed forwarding plane= updates =E2=80=93 no more looping.

> > > >

> > > > That is all I am trying to illus= trate.

> > > >

> > > > If you want to start arguing tha= t node protecting LFAs + microloop

> > avoidance could help (NOTE I explicitly=C2= =A0 took those out of the example for

> > simplicity) =E2=80=93 it is easy enough to= change the example to include multiple node

> > failures or a node failure plus some north= bound link failures on other nodes.

> > > > [Bruno] I=E2=80=99m not talking = about LFA/FRR. And with regards to microloops

> > avoidance, some algorithms can handle any = graph transition so including

> > multiple node failures.

> > > >

> > > > But again, let=E2=80=99s stick t= o LSP flooding and LSDB consistency. (you are the

> > one speaking about microloops in the forwa= rding plane).

> > > >

> > > > The point here is to look at the= impact of long-lived LSDB inconsistency

> > which results when some nodes support floo= ding an order of magnitude

> > faster flooding than other nodes =E2=80=93= which is what you asked me to clarify.

> > > > [Bruno] No. I asked you to clari= fy why having a node with faster flooding

> > could prolongs the period of LSDB inconsis= tency.

> > > >

> > > > Again, with you own words: =E2= =80=9Cwhen only some nodes in the network

> > support faster flooding the behavior of th= e whole network may not be

> > "better" when faster flooding is= enabled because it prolongs the period of

> > LSDB inconsistency.=E2=80=9D=

> > > > And with less words: =E2=80=9Cwh= en only some nodes in the network support

> > faster flooding [=E2=80=A6]=C2=A0 it prolo= ngs the period of LSDB inconsistency.=E2=80=9D

> > > >

> > > > --Bruno

> > > >

> > > >=C2=A0=C2=A0=C2=A0 Les

> > > >

> > > >

> > > >

> > > > From: bruno.decraene@orange.com <bruno.decraene@orange.com>

> > > > Sent: Wednesday, May 06, 2020 6:= 21 AM

> > > > To: Les Ginsberg (ginsberg) <= ginsberg@cisco.com<= /a>>

> > > > Cc: lsr@ietf.org

> > > > Subject: RE: Flooding across a n= etwork

> > > >

> > > > Les,

> > > >

> > > > From: Les Ginsberg (ginsberg) [<= a href=3D"mailto:ginsberg@cisco.com" target=3D"_blank">mailto:ginsberg@cisc= o.com]

> > > > Sent: Wednesday, May 6, 2020 1:3= 5 AM

> > > > To: DECRAENE Bruno TGI/OLN; lsr@ietf..org=

> > > > Subject: RE: Flooding across a n= etwork

> > > >

> > > > Bruno -

> > > >

> > > > Seems like it was not too long a= go that we were discussing this in person.

> > Ahhh...the good old days...<= /span>

> > > > [Bruno] Indeed, may be not to th= e point of concluding. Indeed.

> > > >

> > > > First, let's agree that the = interesting case does not involve 1 or even a

> > small number of LSPs. For those cases floo= ding speed does not matter.

> > > > The interesting cases involve a = large number of LSPs (hundreds or

> > thousands). And in such cases LFA/microloo= p avoidance techniques are not

> > applicable.

> > > >

> > > > Take the following simple topolo= gy:

> > > >

> > > >=C2=A0=C2=A0=C2=A0 |=C2=A0 | ... = |=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 |

> > > >=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 +-= --+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= +---+

> > > >=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 | = C |=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= | E |

> > > >=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 +-= --+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= +---+

> > > >=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0 |=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 | 1000

> > > >=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 +-= --+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= +---+

> > > >=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 | = B |-------------| D |

> > > >=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 +-= --+=C2=A0=C2=A0 1000=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 +---+

> > > >=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0 |=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 |

> > > >=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0 |=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 |

> > > >=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0 \=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0 /

> > > >=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0 \=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0 /

> > > >=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0 \=C2=A0 =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0/

> > > >=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 \=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 /<= u>

> > > >=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 +---+

> > > >=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 | A |

> > > >=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 +---+

> > > >

> > > > There is a topology northbound o= f C and E (not shown) and a topology

> > southbound of A (not shown).=

> > > > Cost on all links is 10 except B= -D and D-E where cost is high.

> > > >

> > > > C is a node with 1000 neighbors.=

> > > > When all links are up, shortest = path for all northbound destinations is via

> > C.

> > > > All nodes in the network support= fast flooding except for Node D.

> > > > Let=E2=80=99s say fast flooding = is 500 LSPs/second and slow flooding (Node D) is 20

> > LSPs/seconds.

> > > > If=C2=A0 Node C fails we have 10= 00 LSPs to flood.

> > > > All nodes except for D can recei= ve these in 2 seconds (plus internode

> > delay time).

> > > > D can receive LSPs in 50 seconds= .

> > > >

> > > > [Bruno] Thanks for your example.= Agreed so far.

> > > >

> > > > When A and B and all southbound = nodes receive/process the LSP

> > updates they will start sending traffic to= Northbound destinations via D.

> > > > But for the better part of 50 se= conds, Node D has yet to receive all LSP

> > updates and still believes that shortest p= ath is via B-C. It will loop traffic.

> > > >

> > > > [Bruno] May I remind you that we= are discussing IS-IS flooding in order to

> > sync LSDB (LSP database). That is already = a big enough subject. It does not

> > including FIB (updates), nor IP forwarding= .

> > > >

> > > > Quoting you =E2=80=9Cwhen only s= ome nodes in the network support faster

> > flooding the behavior of the whole network= may not be "better" when faster

> > flooding is enabled because it prolongs th= e period of LSDB inconsistency.=E2=80=9D

> > > >

> > > > Taking your own examples, in bot= h cases (all nodes support fast flooding;

> > all nodes but D support fast flooding) the= period of LSDB inconsistency is 50

> > seconds. Hence this example does not illus= trate your statement.

> > > >

> > > > Hence I=E2=80=99m restating my q= uestions:

> > > >

> > > > > > when only some nodes i= n the network support faster flooding the

> > behavior

> > > > > of the whole network may no= t be "better" when faster flooding is

> > enabled

> > > > > because it prolongs the per= iod of LSDB inconsistency.

> > > > >

> > > > > 1) Do you have data on this= ?

> > > > >

> > > > > 2) If not, can you provide = an example where increasing the flooding

> > rate on

> > > > > one adjacency prolongs the = period of LSDB inconsistency across the

> > > > > network?

> > > >

> > > >

> > > > Had all nodes used slow flooding= , it still would have taken 50 seconds to

> > converge, but there would be significantly= less looping. There could be a

> > good amount of blackholing, but this is pr= eferable to looping.

> > > > [Bruno] You are using an example= where ordering FIB updates across the

> > network, e.g. as per [1], allows to reduce= _FIB_ inconsistency across the

> > path/network. And you seem to conclude fro= m this that this translates to

> > LSDB update ordering. Those are two differ= ent things. In this thread, I=E2=80=99d

> > suggest that we focus on IGP flooding and = LSDB sync only. (*)

> > > > [1] https://t= ools.ietf.org/html/rfc6976

> > > > (*) We can discuss loop free IGP= converge in a different thread if you

> > want. IMO, the use of segment routing/sour= ce routing is better than oFIB.

> > But at some point, it still relies on fast= flooding when multiple LSPs are

> > involved. (and I mean _fast_ not _ordered_= )

> > > >

> > > > --Bruno

> > > >

> > > > One can always come up with exam= ples =E2=80=93 based on a specific topology

> > and a specific failure - where things migh= t be better/worse/unchanged in the

> > face of inconsistent flooding speed suppor= t.

> > > > But I hope this simple example i= llustrates the pitfalls.

> > > >

> > > >=C2=A0=C2=A0=C2=A0=C2=A0 Les

> > > >

> > > > > -----Original Message-----

> > > > > From: bruno.decraene@orange.com <bruno.decraene@orange.com>

> > > > > Sent: Tuesday, May 05, 2020= 8:28 AM

> > > > > To: Les Ginsberg (ginsberg)= <ginsberg@cisco= .com>; lsr@ietf.org

> > > > > Subject: Flooding across a = network

> > > > >

> > > > > Les,

> > > > >

> > > > > > From: Lsr [mailto:lsr-bounces@ietf.org<= /a>] On Behalf Of Les Ginsberg

> > > > > (ginsberg)

> > > > > > Sent: Monday, May 4, 2= 020 4:39 PM

> > > > > [...]<= /p>

> > > > > > when only some nodes i= n the network support faster flooding the

> > behavior

> > > > > of the whole network may no= t be "better" when faster flooding is

> > enabled

> > > > > because it prolongs the per= iod of LSDB inconsistency.

> > > > >

> > > > > 1) Do you have data on this= ?

> > > > >

> > > > > 2) If not, can you provide = an example where increasing the flooding

> > rate on

> > > > > one adjacency prolongs the = period of LSDB inconsistency across the

> > > > > network?

> > > > >

> > > > > 3) In the meantime, let'= ;s try the theoretical analysis on a simple

> > scenario

> > > > > where a single LSP needs to= be flooded across the network.

> > > > >

> > > > > - Let's call Dij the ti= me needed to flood the LSP from node i to the

> > adjacent

> > > > > node j. Clearly Dij>0.

> > > > > - Let's call k the node= originating this LSP at t0=3D0s

> > > > >

> > > > > >From t0, the LSDB is in= consistent across the network as all nodes but k

> > are

> > > > > missing the LSP and hence o= nly know about the 'old' topology.

> > > > >

> > > > > Let's call=C2=A0 SPT(k)= the SPT rooted on k, using Dij as the metric between<= /p>

> > > > > adjacent nodes i and j. Let= 's call SP(k,i) the shortest path from k to i; and=

> > > > > D(k,i) the shortest distanc= e between k and i.

> > > > >

> > > > > It seems that the time need= ed:

> > > > > - for node j to learn about= the LSP, and get in sync with k, is D(k,j)

> > > >

--
--00000000000095fc1e05a5d45e4b-- From nobody Sun May 17 21:18:26 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id DF9093A08EE for ; Sun, 17 May 2020 21:18:24 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -0.197 X-Spam-Level: X-Spam-Status: No, score=-0.197 tagged_above=-999 required=5 tests=[DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id QZ2oDitEyrZw for ; Sun, 17 May 2020 21:18:23 -0700 (PDT) Received: from mail-ua1-x936.google.com (mail-ua1-x936.google.com [IPv6:2607:f8b0:4864:20::936]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 5DA2B3A08ED for ; Sun, 17 May 2020 21:18:23 -0700 (PDT) Received: by mail-ua1-x936.google.com with SMTP id k3so2971859ual.8 for ; Sun, 17 May 2020 21:18:23 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to; bh=yVa8LuMRvAu1M7J+RrA+lOBHncb8uspH6Nr4YZJwdiI=; b=nnxMPXpJ3rRg2IiWw7KXCJ56wQWYkIorozmkLXoYSarlpB6GBJLN9prmlMTxPfJNq7 n6qU5nptz30N8xY/TaXaDlpmotD6jBRyRyANtAh8tcYMjwFw7EDS0gdPBr1U6O6GOdCB 9Z5QmPAw0s4Q86cPZpDx9O7CiLA16scr/PcoGbVKj6uV/qc/cbiwEuckShGnhrfJdR5k kdqh1o12PQht3NjlI/3n+RBC0SsVUYDc4lpmiq1Zqqe1fw2Sbs9wJ7jrl0Uafwd3BIHq AwvkBhjRboK5JqKTEHGxyWNnGe1gEJsWDYK9DR3b3tRRJFYJigtPQGv0twJD6kVCk/Lj lXyA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to; bh=yVa8LuMRvAu1M7J+RrA+lOBHncb8uspH6Nr4YZJwdiI=; b=UyZLzpsa54w7y77fizWlt79lCmKSG2lRpNRw3L3QhNUrafi3yh/upmP2kVKpVXCBSC Az6Hcb8av0MVXbxmjNyJzmSk92nhL3LYYYVujE3t8eckoQI0nPOeXKhvttAW1DMZatRD HIzKGGv2g4im4WxWe1SGuMdQQ1+yNk+n9DepKo0YyRa9270VvdHGlubNdwaiCoHzwcdK lkrWHI4v0yqZmYm+SfLmKHkLJW+rbjUURHE5P1AuhNsK2KamJU5tHIEOd7OClnGdcF54 aC+ZwngwfoOlPzdgZHhwDrkX1g23q6BhAArrrorn3sqkFxlhitffV6hASu8liqlq3Kug d4Hw== X-Gm-Message-State: AOAM5327SXNGOL+jQ6AvJnw7GQdMLW+oKWbWem2wwz8RBuv/CFjRBkTQ x3mB3pfml5aqufF/EoT2ztwxYZ4L1virulyQF60fsA== X-Google-Smtp-Source: ABdhPJz1d8+mS1W8JI03GvmAuywPuvHXfRRt37urWEjNt4eojPePo6ro6KFtnDDhqLfFfnmKmrquqfMMFKNySfpipo0= X-Received: by 2002:ab0:7846:: with SMTP id y6mr4637850uaq.113.1589775502102; Sun, 17 May 2020 21:18:22 -0700 (PDT) MIME-Version: 1.0 References: <158977540046.11931.12751803599873253674@ietfa.amsl.com> In-Reply-To: <158977540046.11931.12751803599873253674@ietfa.amsl.com> From: Uma Chunduri Date: Sun, 17 May 2020 21:18:30 -0700 Message-ID: To: lsr@ietf.org Content-Type: multipart/alternative; boundary="0000000000001358ec05a5e47428" Archived-At: Subject: [Lsr] Fwd: New Version Notification for draft-chunduri-lsr-isis-mt-deployment-cons-03.txt X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 18 May 2020 04:18:25 -0000 --0000000000001358ec05a5e47428 Content-Type: text/plain; charset="UTF-8" Dear LSR WG, Any comments, suggestions or feedback is welcome. -- Uma C. ---------- Forwarded message --------- From: Date: Sun, May 17, 2020 at 9:16 PM Subject: New Version Notification for draft-chunduri-lsr-isis-mt-deployment-cons-03.txt To: Uma Chunduri , Jeff Tantsura < jefftant.ietf@gmail.com>, Shraddha Hegde A new version of I-D, draft-chunduri-lsr-isis-mt-deployment-cons-03.txt has been successfully submitted by Uma Chunduri and posted to the IETF repository. Name: draft-chunduri-lsr-isis-mt-deployment-cons Revision: 03 Title: IS-IS Multi Topology Deployment Considerations Document date: 2020-05-17 Group: Individual Submission Pages: 9 URL: https://www.ietf.org/internet-drafts/draft-chunduri-lsr-isis-mt-deployment-cons-03.txt Status: https://datatracker.ietf.org/doc/draft-chunduri-lsr-isis-mt-deployment-cons/ Htmlized: https://tools.ietf.org/html/draft-chunduri-lsr-isis-mt-deployment-cons-03 Htmlized: https://datatracker.ietf.org/doc/html/draft-chunduri-lsr-isis-mt-deployment-cons Diff: https://www.ietf.org/rfcdiff?url2=draft-chunduri-lsr-isis-mt-deployment-cons-03 Abstract: This document analyzes IS-IS Multi Topology (MT) applicability in various IS-IS deployments. This document explores the nuances around the terminology and usage of various IS-IS address families, topologies with different considerations, for choosing the right combination for a specific deployment scenario. This document also discusses various ways one can deploy IPv6 only IS-IS topology. Please note that it may take a couple of minutes from the time of submission until the htmlized version and diff are available at tools.ietf.org. The IETF Secretariat --0000000000001358ec05a5e47428 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Dear LSR WG,

Any comments, suggestions = or feedback is welcome.

--
Uma C.
<= div>

---------- Forwarded message ---------
From: <internet-drafts@ietf.org><= /span>
Date: Sun, May 17, 2020 at 9:16 PM
Subject: New Version Notifi= cation for draft-chunduri-lsr-isis-mt-deployment-cons-03.txt
To: Uma Chu= nduri <umac.ietf@gmail.com>= ;, Jeff Tantsura <jefftant.ie= tf@gmail.com>, Shraddha Hegde <shraddha@juniper.net>



A new version of I-D, draft-chunduri-lsr-isis-mt-deployment-cons-03.txt
has been successfully submitted by Uma Chunduri and posted to the
IETF repository.

Name:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0draft-chunduri-lsr-isis-mt-de= ployment-cons
Revision:=C2=A0 =C2=A0 =C2=A0 =C2=A003
Title:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 IS-IS Multi Topology Deployment Co= nsiderations
Document date:=C2=A0 2020-05-17
Group:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Individual Submission
Pages:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 9
URL:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 https://www.ietf.org/internet-drafts/draf= t-chunduri-lsr-isis-mt-deployment-cons-03.txt
Status:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0https://datatracker.ietf.org/doc/draft-chunduri-lsr-isis-m= t-deployment-cons/
Htmlized:=C2=A0 =C2=A0 =C2=A0 =C2=A0https://tools.ietf.org/html/draft-chunduri-lsr-isis-mt-deployment-= cons-03
Htmlized:=C2=A0 =C2=A0 =C2=A0 =C2=A0https://datatracker.ietf.org/doc/html/draft-chunduri-lsr-is= is-mt-deployment-cons
Diff:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0https://www.ietf.org/rfcdiff?url2=3Ddraft-chundu= ri-lsr-isis-mt-deployment-cons-03

Abstract:
=C2=A0 =C2=A0This document analyzes IS-IS Multi Topology (MT) applicability= in
=C2=A0 =C2=A0various IS-IS deployments.=C2=A0 This document explores the nu= ances around
=C2=A0 =C2=A0the terminology and usage of various IS-IS address families, =C2=A0 =C2=A0topologies with different considerations, for choosing the rig= ht
=C2=A0 =C2=A0combination for a specific deployment scenario.

=C2=A0 =C2=A0This document also discusses various ways one can deploy IPv6 = only
=C2=A0 =C2=A0IS-IS topology.





Please note that it may take a couple of minutes from the time of submissio= n
until the htmlized version and diff are available at tools.ietf.org.

The IETF Secretariat


--0000000000001358ec05a5e47428-- From nobody Mon May 18 00:32:54 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id D7CE63A0922; Mon, 18 May 2020 00:32:52 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: 0.004 X-Spam-Level: X-Spam-Status: No, score=0.004 tagged_above=-999 required=5 tests=[HTML_MESSAGE=0.001, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id OuzV4rBKSbFT; Mon, 18 May 2020 00:32:49 -0700 (PDT) Received: from m176115.mail.qiye.163.com (m176115.mail.qiye.163.com [59.111.176.115]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 023943A0923; Mon, 18 May 2020 00:32:48 -0700 (PDT) Received: from WangajPC (unknown [101.242.202.101]) by m176115.mail.qiye.163.com (Hmail) with ESMTPA id 94717666870; Mon, 18 May 2020 15:32:46 +0800 (CST) From: "Aijun Wang" To: "'Acee Lindem \(acee\)'" , Cc: References: <47A153D9-E547-4C4D-A828-EB4410A44048@cisco.com> In-Reply-To: <47A153D9-E547-4C4D-A828-EB4410A44048@cisco.com> Date: Mon, 18 May 2020 15:32:47 +0800 Message-ID: <003401d62ce6$874b5650$95e202f0$@org.cn> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0035_01D62D29.956E9650" X-Mailer: Microsoft Office Outlook 12.0 Thread-Index: AQHWKvGqNKvEXg3aGUuKshXpjzraMqitdowQ Content-Language: zh-cn X-HM-Spam-Status: e1kfGhgUHx5ZQUtXWQgYFAkeWUFZVkpVQklKS0tKSkJOQktMTkJZV1koWU FKTEtLSjdXWS1ZQUlXWQkOFx4IWUFZNTQpNjo3JCkuNz5ZBg++ X-HM-Sender-Digest: e1kMHhlZQR0aFwgeV1kSHx4VD1lBWUc6OQg6ARw6AzgzKzQuPB0LFy08 QxZPCylVSlVKTkNCTENMSk1NQk1CVTMWGhIXVQwaFRwaEhEOFTsPCBIVHBMOGlUUCRxVGBVFWVdZ EgtZQVlKS0pVSU9JVUlLSVVKS0pZV1kIAVlBSktCS083Bg++ X-HM-Tid: 0a7226b3081a9373kuws94717666870 Archived-At: Subject: [Lsr] =?utf-8?b?562U5aSNOiAgRmxvb2RpbmcgVG9wb2xvZ3kgQ29tcHV0YXRp?= =?utf-8?q?on_Algorithm_-_draft-cc-lsr-flooding-reduction-08_IPR_Poll?= X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 18 May 2020 07:32:53 -0000 This is a multi-part message in MIME format. ------=_NextPart_000_0035_01D62D29.956E9650 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hi, Acee: =20 I am not aware of any IPR that applies to = draft-cc-lsr-flooding-reduction-08.txt. =20 =20 Best Regards. =20 Aijun Wang China Telecom =20 =E5=8F=91=E4=BB=B6=E4=BA=BA: lsr-bounces@ietf.org = [mailto:lsr-bounces@ietf.org] =E4=BB=A3=E8=A1=A8 Acee Lindem (acee) =E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2020=E5=B9=B45=E6=9C=8816=E6=97=A5 = 3:47 =E6=94=B6=E4=BB=B6=E4=BA=BA: draft-cc-lsr-flooding-reduction@ietf.org =E6=8A=84=E9=80=81: lsr@ietf.org =E4=B8=BB=E9=A2=98: [Lsr] Flooding Topology Computation Algorithm - = draft-cc-lsr-flooding-reduction-08 IPR Poll =20 Authors,=20 =20 Are you aware of any IPR that applies to = draft-cc-lsr-flooding-reduction-08.txt. =20 If so, has this IPR been disclosed in compliance with IETF IPR rules=20 (see RFCs 3979, 4879, 3669 and 5378 for more details). =20 If you are listed as a document author or contributor please respond to this email regardless of whether or not you are aware of any relevant IPR. *The response needs to be sent to the LSR WG mailing list.* The document will not advance to the next stage until a response has been received from each author and contributor. =20 If you are on the LSR WG email list but are not listed as an author or contributor, then please explicitly respond only if you are aware of any IPR that has not yet been disclosed in conformance with IETF rules. =20 Thanks, Acee ------=_NextPart_000_0035_01D62D29.956E9650 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable

Hi, = Acee:

 

I am not aware of any IPR that = applies to = draft-cc-lsr-flooding-reduction-08.txt.

 

 

Best = Regards.

 

Aijun = Wang

China = Telecom

 

=E5=8F=91=E4=BB= =B6=E4=BA=BA: = lsr-bounces@ietf.org [mailto:lsr-bounces@ietf.org] =E4=BB=A3=E8=A1= =A8 Acee Lindem = (acee)
=E5=8F=91=E9=80= =81=E6=97=B6=E9=97=B4: = 2020=E5=B9=B45=E6=9C=8816=E6=97=A5 3:47
=E6=94=B6=E4=BB=B6=E4=BA=BA: = draft-cc-lsr-flooding-reduction@ietf.org
=E6=8A=84=E9=80=81<= span lang=3DEN-US>: = lsr@ietf.org
=E4=B8=BB=E9=A2=98: [Lsr] Flooding Topology = Computation Algorithm - draft-cc-lsr-flooding-reduction-08 IPR = Poll

 

Authors, =

 

Are you = aware of any IPR that applies = to draft-cc-lsr-flooding-reduction-08.txt.

 

If so, = has this IPR been disclosed in compliance with IETF IPR = rules 

(see RFCs 3979, 4879, 3669 and 5378 for more = details).

 

If you = are listed as a document author or contributor please = respond

to this email regardless of whether or not = you are aware of any

relevant IPR. *The response = needs to be sent to the LSR WG mailing

list.* = The document will not advance to the next stage until = a

response has been received from each author = and contributor.

 

If you = are on the LSR WG email list but are not listed as an author = or

contributor, then please explicitly respond = only if you are aware of

any IPR that has not yet been = disclosed in conformance with IETF rules.

 

Thanks,

Acee

------=_NextPart_000_0035_01D62D29.956E9650-- From nobody Mon May 18 00:51:11 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id A24513A0943 for ; Mon, 18 May 2020 00:51:08 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: 0.004 X-Spam-Level: X-Spam-Status: No, score=0.004 tagged_above=-999 required=5 tests=[HTML_MESSAGE=0.001, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=unavailable autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id i9NuYMpAbDsd for ; Mon, 18 May 2020 00:51:04 -0700 (PDT) Received: from m176115.mail.qiye.163.com (m176115.mail.qiye.163.com [59.111.176.115]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id ECCFF3A093F for ; Mon, 18 May 2020 00:51:03 -0700 (PDT) Received: from WangajPC (unknown [101.242.202.101]) by m176115.mail.qiye.163.com (Hmail) with ESMTPA id 1437F6656E0; Mon, 18 May 2020 15:50:59 +0800 (CST) From: "Aijun Wang" To: "'Acee Lindem \(acee\)'" , References: <63330FD6-EDE8-4938-AA85-948279C57E34@cisco.com> In-Reply-To: <63330FD6-EDE8-4938-AA85-948279C57E34@cisco.com> Date: Mon, 18 May 2020 15:50:59 +0800 Message-ID: <004201d62ce9$126cca50$37465ef0$@org.cn> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0043_01D62D2C.20900A50" X-Mailer: Microsoft Office Outlook 12.0 Thread-Index: AQHWKvCWbO+rNwui80Sty0q3wo/aI6itd0EQ Content-Language: zh-cn X-HM-Spam-Status: e1kfGhgUHx5ZQUtXWQgYFAkeWUFZVktVT0hMQkJCTENPQk9NT09JWVdZKF lBSkxLS0o3V1ktWUFJV1kJDhceCFlBWTU0KTY6NyQpLjc#WQY+ X-HM-Sender-Digest: e1kMHhlZQR0aFwgeV1kSHx4VD1lBWUc6NS46ESo*Kzg#DTRJPEwXCklC Kx0aFDNVSlVKTkNCTENDSU1JSUJMVTMWGhIXVQwaFRwaEhEOFTsPCBIVHBMOGlUUCRxVGBVFWVdZ EgtZQVlKS0pVSU9JVUlLSVVKS0pZV1kIAVlBQ09PSzcG X-HM-Tid: 0a7226c3b35e9373kuws1437f6656e0 Archived-At: Subject: [Lsr] =?utf-8?b?562U5aSNOiAgRmxvb2RpbmcgVG9wb2xvZ3kgQ29tcHV0YXRp?= =?utf-8?q?on_Algorithm_-_draft-cc-lsr-flooding-reduction-08_Working_Group?= =?utf-8?q?_Adoption_Call?= X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 18 May 2020 07:51:09 -0000 This is a multi-part message in MIME format. ------=_NextPart_000_0043_01D62D2C.20900A50 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Yes, support as co-author. The algorithm is needed for the flooding reduction deployment and should = be standardized especially in distributed mode. =20 Best Regards. =20 Aijun Wang China Telecom =20 =E5=8F=91=E4=BB=B6=E4=BA=BA: lsr-bounces@ietf.org = [mailto:lsr-bounces@ietf.org] =E4=BB=A3=E8=A1=A8 Acee Lindem (acee) =E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2020=E5=B9=B45=E6=9C=8816=E6=97=A5 = 3:40 =E6=94=B6=E4=BB=B6=E4=BA=BA: lsr@ietf.org =E4=B8=BB=E9=A2=98: [Lsr] Flooding Topology Computation Algorithm - = draft-cc-lsr-flooding-reduction-08 Working Group Adoption Call =20 This begins a 3 week (due to holidays) WG adoption call for the = =E2=80=9CFlooding Topology Computation Algorithm=E2=80=9D draft. Please = issue your support or objection to this list by 11:59 PM, UTC on June = 5th, 2020. Here is a URL for your convenience.=20 =20 https://datatracker.ietf.org/doc/draft-cc-lsr-flooding-reduction/ =20 Thanks, Acee ------=_NextPart_000_0043_01D62D2C.20900A50 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable

Yes, support as = co-author.

The algorithm is needed for the = flooding reduction deployment and should be standardized especially in = distributed mode.

 

Best = Regards.

 

Aijun = Wang

China = Telecom

 

=E5=8F=91=E4=BB= =B6=E4=BA=BA: = lsr-bounces@ietf.org [mailto:lsr-bounces@ietf.org] =E4=BB=A3=E8=A1= =A8 Acee Lindem = (acee)
=E5=8F=91=E9=80= =81=E6=97=B6=E9=97=B4: = 2020=E5=B9=B45=E6=9C=8816=E6=97=A5 3:40
=E6=94=B6=E4=BB=B6=E4=BA=BA: = lsr@ietf.org
=E4=B8=BB=E9=A2=98: [Lsr] Flooding Topology = Computation Algorithm - draft-cc-lsr-flooding-reduction-08 Working Group = Adoption Call

 

This = begins a 3 week (due to holidays) WG adoption call for the = =E2=80=9CFlooding Topology Computation Algorithm=E2=80=9D draft. Please = issue your support or objection to this list by 11:59 PM, UTC on June = 5th, 2020. Here is a URL for your convenience. =

 

https://datatracker.ietf.org/doc/draft-cc-lsr-flooding-reduction/

 

Thanks,
Acee

------=_NextPart_000_0043_01D62D2C.20900A50-- From nobody Mon May 18 00:54:07 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 117923A0946 for ; Mon, 18 May 2020 00:54:06 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: 0.003 X-Spam-Level: X-Spam-Status: No, score=0.003 tagged_above=-999 required=5 tests=[HTML_MESSAGE=0.001, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id USqcSjqYCkQB for ; Mon, 18 May 2020 00:54:04 -0700 (PDT) Received: from huawei.com (lhrrgout.huawei.com [185.176.76.210]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 8ACBD3A0945 for ; Mon, 18 May 2020 00:54:04 -0700 (PDT) Received: from lhreml736-chm.china.huawei.com (unknown [172.18.7.107]) by Forcepoint Email with ESMTP id 190D5774419E4FCA2B93 for ; Mon, 18 May 2020 08:54:03 +0100 (IST) Received: from lhreml736-chm.china.huawei.com (10.201.108.87) by lhreml736-chm.china.huawei.com (10.201.108.87) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.1913.5; Mon, 18 May 2020 08:54:02 +0100 Received: from DGGEML421-HUB.china.huawei.com (10.1.199.38) by lhreml736-chm.china.huawei.com (10.201.108.87) with Microsoft SMTP Server (version=TLS1_0, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA) id 15.1.1913.5 via Frontend Transport; Mon, 18 May 2020 08:54:02 +0100 Received: from DGGEML511-MBS.china.huawei.com ([169.254.4.224]) by dggeml421-hub.china.huawei.com ([10.1.199.38]) with mapi id 14.03.0487.000; Mon, 18 May 2020 15:53:58 +0800 From: Qin Wu To: "'Acee Lindem (acee)'" , "lsr@ietf.org" Thread-Topic: [Lsr] RE: Flooding Topology Computation Algorithm - draft-cc-lsr-flooding-reduction-08 Working Group Adoption Call Thread-Index: AdYs6VtsuImSul4IQ5OBL99jDSjgfA== Date: Mon, 18 May 2020 07:53:59 +0000 Message-ID: Accept-Language: zh-CN, en-US Content-Language: zh-CN X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.138.33.123] Content-Type: multipart/alternative; boundary="_000_B8F9A780D330094D99AF023C5877DABAAD6CFE47dggeml511mbschi_" MIME-Version: 1.0 X-CFilter-Loop: Reflected Archived-At: Subject: Re: [Lsr] Flooding Topology Computation Algorithm - draft-cc-lsr-flooding-reduction-08 Working Group Adoption Call X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 18 May 2020 07:54:06 -0000 --_000_B8F9A780D330094D99AF023C5877DABAAD6CFE47dggeml511mbschi_ Content-Type: text/plain; charset="utf-8" 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mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 1oJ8UbNTI5mO; Mon, 18 May 2020 02:45:32 -0700 (PDT) Received: from aer-iport-4.cisco.com (aer-iport-4.cisco.com [173.38.203.54]) (using TLSv1.2 with cipher DHE-RSA-SEED-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id C5A443A0A3E; Mon, 18 May 2020 02:45:31 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=1967; q=dns/txt; s=iport; t=1589795132; x=1591004732; h=from:subject:to:cc:references:message-id:date: mime-version:in-reply-to:content-transfer-encoding; bh=dc1q6JUpVoZfMJ6a+oISRUql2KRGMn/EqbdFsDEZlUU=; b=fL/xFFwy2gJdwUd+8EjfGH4hFWt+lXeJ1dxjmeaW7hUg9XL6V+Hy6TlY LtBTeX2gE7Bm3Dvz03XLU/mf6XO6yYdReEkP+7lazt7iy9eBeZBTec2dX Hr42kgPnGtKPIGDdK85uryFKgWhjPhEdzXmwPTWiYgpl0w1BTePjlbmN3 c=; X-IronPort-AV: E=Sophos;i="5.73,406,1583193600"; d="scan'208";a="26236646" Received: from aer-iport-nat.cisco.com (HELO aer-core-1.cisco.com) ([173.38.203.22]) by aer-iport-4.cisco.com with ESMTP/TLS/DHE-RSA-SEED-SHA; 18 May 2020 09:45:30 +0000 Received: from [10.60.140.51] (ams-ppsenak-nitro2.cisco.com [10.60.140.51]) by aer-core-1.cisco.com (8.15.2/8.15.2) with ESMTP id 04I9jTQt017958; Mon, 18 May 2020 09:45:29 GMT From: Peter Psenak To: Erik Kline , The IESG Cc: draft-ietf-ospf-mpls-elc@ietf.org, lsr-chairs@ietf.org, lsr@ietf.org, Acee Lindem , aretana.ietf@gmail.com References: <158969018219.30789.6119849985741094254@ietfa.amsl.com> Message-ID: Date: Mon, 18 May 2020 11:45:29 +0200 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:60.0) Gecko/20100101 Thunderbird/60.7.0 MIME-Version: 1.0 In-Reply-To: <158969018219.30789.6119849985741094254@ietfa.amsl.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-Outbound-SMTP-Client: 10.60.140.51, ams-ppsenak-nitro2.cisco.com X-Outbound-Node: aer-core-1.cisco.com Archived-At: Subject: Re: [Lsr] Erik Kline's No Objection on draft-ietf-ospf-mpls-elc-13: (with COMMENT) X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 18 May 2020 09:45:34 -0000 Hi Erik, please see inline: On 17/05/2020 06:36, Erik Kline via Datatracker wrote: > Erik Kline has entered the following ballot position for > draft-ietf-ospf-mpls-elc-13: No Objection > > When responding, please keep the subject line intact and reply to all > email addresses included in the To and CC lines. (Feel free to cut this > introductory paragraph, however.) > > > Please refer to https://www.ietf.org/iesg/statement/discuss-criteria.html > for more information about IESG DISCUSS and COMMENT positions. > > > The document, along with other ballot positions, can be found here: > https://datatracker.ietf.org/doc/draft-ietf-ospf-mpls-elc/ > > > > ---------------------------------------------------------------------- > COMMENT: > ---------------------------------------------------------------------- > > [[ nits ]] > > [ section 1 ] > * "(e.g., SR-MPLS" is missing a closing parenthesis yes, this has been fixed as a response to previous comments. > > [ section 3 ] > * "...unless all of its interfaces...":" do management interfaces, or other > interfaces over which no forwarding is taking place, count in this definition > of "all"? no, only those over which forwarding happens should be considered. > If not, does this text need to be tightened or is this just one > of those things all implementers will naturally figure out? (I'm actually > betting this is just something readers will intuit.) I would think so. It's kind of obvious that one would not take into consideration interfaces like loopback or other types over which real forwarding does not happen. The original text used line-cards instead of interfaces, but that was changed to interfaces based on comments from Alvaro. If you insist, I can add a text to exclude the "non forwarding" interfaces, but I can see more questions coming in as a result :) thanks, Peter > > > > > From nobody Mon May 18 05:42:34 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 956223A0B8C for ; Mon, 18 May 2020 05:42:26 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -0.194 X-Spam-Level: X-Spam-Status: No, score=-0.194 tagged_above=-999 required=5 tests=[AC_DIV_BONANZA=0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, HTML_MESSAGE=0.001, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, UNPARSEABLE_RELAY=0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=orange.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id i3CP7-PvGGgU for ; Mon, 18 May 2020 05:42:20 -0700 (PDT) Received: from relais-inet.orange.com (relais-inet.orange.com [80.12.70.36]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 11FF73A0BB0 for ; Mon, 18 May 2020 05:42:16 -0700 (PDT) Received: from opfednr05.francetelecom.fr (unknown [xx.xx.xx.69]) by opfednr26.francetelecom.fr (ESMTP service) with ESMTP id 49QdvB2ztrz10M6; Mon, 18 May 2020 14:42:14 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=orange.com; s=ORANGE001; t=1589805734; bh=OLzam3tJ5PkV47PMC5kC15D/1wPKwCIuO/T4WiE8XWY=; h=From:To:Subject:Date:Message-ID:Content-Type:MIME-Version; b=JvDaG5XPogTYd2KaOe7/nlfIc74SCV6Z5J6T8aB8+ZyWd/N7WyuVoLmCcTfLfWi3+ jh37YK55LF9I3b8hocn5zJzJl0OwIU7fyvxTLynDF/cP6Cp6JxjoF5X6ZDUmiIAPT+ l2DNwljTKcHBdEUqr1i8JmT1u7N3JaA1sXn489bAoVkHd2A4FuO7Vtm/49n84Cim8+ MIkihaahnUmZD7Eijq9W1hmegKF25u9Wvwwg6KL153ZWxIFmLzubne26zHzBsqA3pu //0bfDCRItGffcYK9DEbg3aT0Tt5kBI3Ku3Wg7ob/gD8JTft0R4COmpKVu4FQ3IIJ0 LhornM3Y6fleA== Received: from Exchangemail-eme6.itn.ftgroup (unknown [xx.xx.13.26]) by opfednr05.francetelecom.fr (ESMTP service) with ESMTP id 49QdvB155qzyQN; Mon, 18 May 2020 14:42:14 +0200 (CEST) From: To: Gyan Mishra CC: Christian Hopps , "Les Ginsberg (ginsberg)" , "lsr@ietf.org" Thread-Topic: [Lsr] Flooding across a network Thread-Index: AQHWLCqJzhKomMhYpkS2qFhMxpGD8qitoAJQ Date: Mon, 18 May 2020 12:42:13 +0000 Message-ID: <31044_1589805734_5EC282A6_31044_440_1_53C29892C857584299CBF5D05346208A48E6052C@OPEXCAUBM43.corporate.adroot.infra.ftgroup> References: <24209_1588692477_5EB185FD_24209_35_1_53C29892C857584299CBF5D05346208A48E3D455@OPEXCAUBM43.corporate.adroot.infra.ftgroup> <6287_1588771252_5EB2B9B4_6287_332_1_53C29892C857584299CBF5D05346208A48E3F698@OPEXCAUBM43.corporate.adroot.infra.ftgroup> <10562_1588775602_5EB2CAB2_10562_251_11_53C29892C857584299CBF5D05346208A48E3FB63@OPEXCAUBM43.corporate.adroot.infra.ftgroup> <87CDE7F3-E08D-4C45-9AF1-9DAD635F8908@chopps.org> <9992_1588784982_5EB2EF56_9992_201_1_53C29892C857584299CBF5D05346208A48E40256@OPEXCAUBM43.corporate.adroot.infra.ftgroup> <6544_1588843052_5EB3D22C_6544_99_1_53C29892C857584299CBF5D05346208A48E415A8@OPEXCAUBM43.corporate.adroot.infra.ftgroup> <26975_1588867353_5EB43119_26975_5_1_53C29892C857584299CBF5D05346208A48E423B4@OPEXCAUBM43.corporate.adroot.infra.ftgroup> In-Reply-To: Accept-Language: fr-FR, en-US Content-Language: fr-FR X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.114.13.247] Content-Type: multipart/alternative; boundary="_000_53C29892C857584299CBF5D05346208A48E6052COPEXCAUBM43corp_" MIME-Version: 1.0 Archived-At: Subject: Re: [Lsr] Flooding across a network X-BeenThere: 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(localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id 6ED333A0410; Mon, 18 May 2020 07:40:00 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: internet-drafts@ietf.org To: Cc: lsr@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 6.130.0 Auto-Submitted: auto-generated Precedence: bulk Reply-To: lsr@ietf.org Message-ID: <158981280038.23524.16132993584787076371@ietfa.amsl.com> Date: Mon, 18 May 2020 07:40:00 -0700 Archived-At: Subject: [Lsr] I-D Action: draft-ietf-isis-te-app-13.txt X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 18 May 2020 14:40:00 -0000 A New Internet-Draft is available from the on-line Internet-Drafts directories. This draft is a work item of the Link State Routing WG of the IETF. Title : IS-IS TE Attributes per application Authors : Les Ginsberg Peter Psenak Stefano Previdi Wim Henderickx John Drake Filename : draft-ietf-isis-te-app-13.txt Pages : 21 Date : 2020-05-18 Abstract: Existing traffic engineering related link attribute advertisements have been defined and are used in RSVP-TE deployments. Since the original RSVP-TE use case was defined, additional applications (e.g., Segment Routing Traffic Engineering, Loop Free Alternate) have been defined which also make use of the link attribute advertisements. In cases where multiple applications wish to make use of these link attributes the current advertisements do not support application specific values for a given attribute nor do they support indication of which applications are using the advertised value for a given link. This document introduces new link attribute advertisements which address both of these shortcomings. The IETF datatracker status page for this draft is: https://datatracker.ietf.org/doc/draft-ietf-isis-te-app/ There are also htmlized versions available at: https://tools.ietf.org/html/draft-ietf-isis-te-app-13 https://datatracker.ietf.org/doc/html/draft-ietf-isis-te-app-13 A diff from the previous version is available at: https://www.ietf.org/rfcdiff?url2=draft-ietf-isis-te-app-13 Please note that it may take a couple of minutes from the time of submission until the htmlized version and diff are available at tools.ietf.org. Internet-Drafts are also available by anonymous FTP at: ftp://ftp.ietf.org/internet-drafts/ From nobody Mon May 18 10:33:52 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 3BB843A0A00; Mon, 18 May 2020 10:33:50 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -0.197 X-Spam-Level: X-Spam-Status: No, score=-0.197 tagged_above=-999 required=5 tests=[DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=unavailable autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id U2gCcNyPGEG7; Mon, 18 May 2020 10:33:47 -0700 (PDT) Received: from mail-io1-xd31.google.com (mail-io1-xd31.google.com [IPv6:2607:f8b0:4864:20::d31]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id B53EE3A0A05; Mon, 18 May 2020 10:33:47 -0700 (PDT) Received: by mail-io1-xd31.google.com with SMTP id o5so11477713iow.8; Mon, 18 May 2020 10:33:47 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=Z/r2j/EzX92ZhnPsEesKRcA8e3fRQugDRr9XgQWhenA=; b=Cygwk9ijZOIhxGNLc9w34Oq5xxO8/cbVC2s6Q0sbvXGvJyG4z4IrMPjlYEhFXyYt49 zY7WjkUKEUlFRo9Wg7iDUxRNWUDfka9wU6VN58DhCc+LgAVYsYT4h19b4U08c+nT4jIP yojOFDQLEGMFFNItCBn29N9tjBTCvr/z0h19byfcCXU8LT86XA58ML14ikTH1HbQ0WOz n4/LvCHXEejSbNP2JJG7XQkzlR/aCd0iZ29e91koJrFvzl9QUMRZb/EucqL7zK7RTSms QACRSWuOL5WKbP/LmWcCiL+xL/3246IsflRoEDPUSJrUzCqwPPbDuSxC8BeTqYFIiQ4w 2aug== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=Z/r2j/EzX92ZhnPsEesKRcA8e3fRQugDRr9XgQWhenA=; b=bN1lj0F25h8Wf9dm+RffhyR2PSp/Wbb6EeKAownyTTIAC/C7eCNxUrTrmEQCu8GABO y0h/kgAy2p01P5uWxcPwOuGNZ7DFVhItn4yoqT0FkAFxGhqZBLepzMCf4QkuiDvFTP9H k6KWGcjIOvFspPsdPlQJdEqKjR8uccIh/gyNcMD3bxeW9xwMvAojIcwaDIM3ud69VtxW +CgQIv+2tGeSCeGGk1f4cgVp9MJlbxV1tNc6loXuHzaCcq08ggpvWRzv4lFk9t3ueJiF 9dkNtxWVsTKeq+quBQcjLBbOgJMMKFX0n6HdBxiCaBVCGc4ZKxomFLfJeSI3BM7847fm o9/w== X-Gm-Message-State: AOAM533+89H8rNZpvNFUuADfFS38qTznqBSFsr5g7XnADz1euGUlS8Iz wXY3i7SEnkWa/jFDEvkVXCxd6Mxo6dDlwqptVPLD/fi/ X-Google-Smtp-Source: ABdhPJxKg8b20o6fCUJwLBoulrV4wGzt9vfYWFVXCg33XhvQ1Ekuaj4Uz4mV/XoI5qgRSUlBlT8uLIpGi0F0GnDrpd0= X-Received: by 2002:a05:6602:153:: with SMTP id v19mr15698609iot.127.1589823226893; Mon, 18 May 2020 10:33:46 -0700 (PDT) MIME-Version: 1.0 References: <47A153D9-E547-4C4D-A828-EB4410A44048@cisco.com> <003401d62ce6$874b5650$95e202f0$@org.cn> In-Reply-To: <003401d62ce6$874b5650$95e202f0$@org.cn> From: Xufeng Liu Date: Mon, 18 May 2020 13:33:36 -0400 Message-ID: To: Aijun Wang Cc: "Acee Lindem (acee)" , draft-cc-lsr-flooding-reduction@ietf.org, lsr@ietf.org Content-Type: multipart/alternative; boundary="000000000000b1dae505a5ef9080" Archived-At: Subject: Re: [Lsr] Flooding Topology Computation Algorithm - draft-cc-lsr-flooding-reduction-08 IPR Poll X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 18 May 2020 17:33:50 -0000 --000000000000b1dae505a5ef9080 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable I am not aware of any IPR that has not yet been disclosed. Thanks, - Xufeng On Mon, May 18, 2020 at 3:32 AM Aijun Wang wrote: > Hi, Acee: > > > > I am not aware of any IPR that applies to > draft-cc-lsr-flooding-reduction-08.txt. > > > > > > Best Regards. > > > > Aijun Wang > > China Telecom > > > > *=E5=8F=91=E4=BB=B6=E4=BA=BA:* lsr-bounces@ietf.org [mailto:lsr-bounces@i= etf.org] *=E4=BB=A3=E8=A1=A8 *Acee > Lindem (acee) > *=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4:* 2020=E5=B9=B45=E6=9C=8816=E6=97= =A5 3:47 > *=E6=94=B6=E4=BB=B6=E4=BA=BA:* draft-cc-lsr-flooding-reduction@ietf.org > *=E6=8A=84=E9=80=81:* lsr@ietf.org > *=E4=B8=BB=E9=A2=98:* [Lsr] Flooding Topology Computation Algorithm - > draft-cc-lsr-flooding-reduction-08 IPR Poll > > > > Authors, > > > > Are you aware of any IPR that applies > to draft-cc-lsr-flooding-reduction-08.txt. > > > > If so, has this IPR been disclosed in compliance with IETF IPR rules > > (see RFCs 3979, 4879, 3669 and 5378 for more details). > > > > If you are listed as a document author or contributor please respond > > to this email regardless of whether or not you are aware of any > > relevant IPR. *The response needs to be sent to the LSR WG mailing > > list.* The document will not advance to the next stage until a > > response has been received from each author and contributor. > > > > If you are on the LSR WG email list but are not listed as an author or > > contributor, then please explicitly respond only if you are aware of > > any IPR that has not yet been disclosed in conformance with IETF rules. > > > > Thanks, > > Acee > --000000000000b1dae505a5ef9080 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable

I am not aware of any IP= R that has not yet been disclosed.

Thanks,

- Xufeng


On Mon, May 18, 2020 at 3:32 AM= Aijun Wang <wangaijun@tsinghua.org.cn> wrote:

Hi, = Acee:

=C2=A0<= /p>

I am not aware of any IPR that applies to draft-cc-lsr-= flooding-reduction-08.txt.

<= span style=3D"font-size:10.5pt;color:rgb(31,73,125)" lang=3D"EN-US">= =C2=A0

=C2=A0

Best Regards.

=C2=A0

Aijun Wang<= /u>

China Telecom<= u>

=C2=A0

=E5=8F=91=E4=BB=B6=E4=BA=BA: lsr-b= ounces@ietf.org [mailto:lsr-bounces@ietf.org] =E4=BB=A3=E8=A1=A8 Acee Lin= dem (acee)
=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2020=E5=B9=B45=E6=9C=8816=E6=97=A5 3:47
=E6=94=B6= =E4=BB=B6=E4=BA=BA: draft-cc-lsr-flooding-reduction@ietf.org
=E6=8A=84=E9=80= =81: lsr@ietf.org
=E4=B8=BB=E9= =A2=98: [Lsr] Flooding= Topology Computation Algorithm - draft-cc-lsr-flooding-reduction-08 IPR Po= ll

=C2=A0

Authors,

<= p class=3D"MsoNormal">= =C2=A0

Are you aware of any IPR that applies to=C2=A0draft-cc-ls= r-flooding-reduction-08.txt.

=C2=A0<= /p>

If = so, has this IPR been disclosed in compliance with IETF IPR rules=C2=A0<= /u>

(see RFCs 3979, 4879, 3669 and 5378 for more details).

=C2=A0

If you are listed as a document autho= r or contributor please respond

to this email regardless = of whether or not you are aware of any

relevant IPR. *The= response needs to be sent to the LSR WG mailing

list.* T= he document will not advance to the next stage until a=

re= sponse has been received from each author and contributor.

=C2=A0

If you are on the LSR WG email list but are not = listed as an author or

contributor, then please explicitl= y respond only if you are aware of

any IPR that has not y= et been disclosed in conformance with IETF rules.

<= p class=3D"MsoNormal">= =C2=A0

Thanks,

Acee

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[Lsr] Flooding Topology Computation Algorithm - draft-cc-lsr-flooding-reduction-08 IPR Poll X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 18 May 2020 20:02:06 -0000 --Apple-Mail=_BDFAF883-2ECE-40BE-928B-832D041AB7B4 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=utf-8 > On May 15, 2020, at 12:47 PM, Acee Lindem (acee) = wrote: >=20 > If you are on the LSR WG email list but are not listed as an author or > contributor, then please explicitly respond only if you are aware of > any IPR that has not yet been disclosed in conformance with IETF = rules. > =20 Hi, Our IPR disclosure for dynamic flooding = (https://datatracker.ietf.org/ipr/4044/ = ) may also apply to this draft. I am not a lawyer and I don=E2=80=99t play one on this mailing list, = either. Regards, Tony --Apple-Mail=_BDFAF883-2ECE-40BE-928B-832D041AB7B4 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=utf-8

On May 15, 2020, at 12:47 PM, Acee Lindem (acee) <acee=3D40cisco.com@dmarc.ietf.org> wrote:

If you are = on the LSR WG email list but are not listed as an author or
contributor, then please = explicitly respond only if you are aware of
any IPR that has not yet been = disclosed in conformance with IETF rules.
 


Hi,

Our IPR disclosure for dynamic flooding (https://datatracker.ietf.org/ipr/4044/) may also apply to = this draft.

I = am not a lawyer and I don=E2=80=99t play one on this mailing list, = either.

Regards,
Tony

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AOAM532qv+K/HNLJNpRS0r2W5NBV9+60EkD1NFMkowjSdZ0ekx76KiOa a6P56/ktGjMdntngEyV/DOnigsnvjFHGOufbobI= X-Google-Smtp-Source: ABdhPJzti/N6pJPvdnFL+u31sbodLxMMb3/CSN2f9HKCfEzM6Gq8ipCXdQfLWDBVbtm81ennW/e50qm6M7A12AYitbc= X-Received: by 2002:a92:d06:: with SMTP id 6mr19129355iln.257.1589853132725; Mon, 18 May 2020 18:52:12 -0700 (PDT) MIME-Version: 1.0 References: <28938a998b384038b6dd513db00072cf@nokia-sbell.com> <48FED425-3613-42BD-9892-4CD6786EF1BB@gmail.com> In-Reply-To: From: Gyan Mishra Date: Mon, 18 May 2020 21:52:02 -0400 Message-ID: To: "Wang, Weibin (NSB - CN/Shanghai)" Cc: Jeff Tantsura , "Ketan Talaulikar (ketant)" , "lsr@ietf.org" Content-Type: multipart/alternative; boundary="00000000000038befd05a5f687bd" Archived-At: Subject: Re: [Lsr] draft-ietf-lsr-flex-algo X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 19 May 2020 01:52:18 -0000 --00000000000038befd05a5f687bd Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Flex algo is usually mentioned in the context of SR-TE to help reduced SRH size to circumvent MSD issues for both SRV6 and SR-MPLS, however can the 0-127 flex algo extensions since it=E2=80=99s an IGP extension used in any = pure IP network independent of SR flavors SR-MPLS or SRv6. Also can flex algo be used in conjunction with RSVP-TE or PPR(preferred path routing). Kind regards Gyan On Sat, May 9, 2020 at 9:25 PM Wang, Weibin (NSB - CN/Shanghai) < weibin.wang@nokia-sbell.com> wrote: > Jeff, I see what you said, thank you for sharing information; > > > > > > > > Cheers! > > > > Wang Weibin > > > > *From:* Jeff Tantsura > *Sent:* 2020=E5=B9=B45=E6=9C=8810=E6=97=A5 3:24 > *To:* Wang, Weibin (NSB - CN/Shanghai) > *Cc:* Ketan Talaulikar (ketant) ; lsr@ietf.org > *Subject:* Re: [Lsr] draft-ietf-lsr-flex-algo > > > > Weibin, > > > > One could have an algo with MSD/ERLD as optimizations constrains, would b= e > quite similar to colored links. Note - ERLD has implemented node > capabilities only, so all links on a node will have to be pruned. > > The tradeoffs are - having centralized controller with global view > computing a path that meets the constraints(classical BGP-LS + PCEP > scenario) vs building a dynamic topology of connected nodes that meet a s= et > of constrains, in first case, change in topology/capabilities would cause > path recalculation/reoptimization on the PCE while in the second - IGP > would recompute the topology locally. > > > > Regards, > > Jeff > > > > On May 9, 2020, at 01:27, Wang, Weibin (NSB - CN/Shanghai) < > weibin.wang@nokia-sbell.com> wrote: > > =EF=BB=BF > > Ketan, thank you for clarification. > > > > > > > > Cheers! > > > > Wang Weibin > > > > *From:* Ketan Talaulikar (ketant) > *Sent:* 2020=E5=B9=B45=E6=9C=889=E6=97=A5 14:52 > *To:* Wang, Weibin (NSB - CN/Shanghai) ; > lsr@ietf.org > *Subject:* RE: draft-ietf-lsr-flex-algo > > > > Hi Wang, > > > > You are correct. Though I wouldn=E2=80=99t call it a goal but rather a > benefit/advantage =E2=80=93 same applies to SR-MPLS where the label stack= can be > reduced. > > > > Thanks, > > Ketan > > > > *From:* Lsr *On Behalf Of *Wang, Weibin (NSB - > CN/Shanghai) > *Sent:* 08 May 2020 19:07 > *To:* lsr@ietf.org > *Subject:* [Lsr] draft-ietf-lsr-flex-algo > > > > Hi authors: > > > > After reading through this draft lsr-flex-algo, I want to know whether > there is a potential goal of this draft to reduce the SRH size with > enabling flex-algo with admin group in SRv6 deployment, because without > flex-algo we have to have a big SRH size when the SRH include more SRv6 > SIDs, if we enable flex-algo under special topology and link constraint > condition, in theory we can even construct a end to end SR path/tunnel > without SRH, but it still meet TE requirement. So my question is whether > the flex-algo can be used as tool to reduce SRH size? > > > > > > > > *Cheers !* > > > > *WANG Weibin* > > _______________________________________________ > Lsr mailing list > Lsr@ietf.org > https://www.ietf.org/mailman/listinfo/lsr > > _______________________________________________ > Lsr mailing list > Lsr@ietf.org > https://www.ietf.org/mailman/listinfo/lsr > --=20 Gyan Mishra Network Engineering & Technology Verizon Silver Spring, MD 20904 Phone: 301 502-1347 Email: gyan.s.mishra@verizon.com --00000000000038befd05a5f687bd Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable

Flex algo is usually mentioned in the cont= ext of SR-TE to help reduced SRH size to circumvent MSD issues for both SRV= 6 and SR-MPLS, however can the 0-127 flex algo extensions since it=E2=80=99= s an IGP extension used in any pure IP network independent of SR flavors SR= -MPLS or SRv6. =C2=A0

Al= so can flex algo be used in conjunction with RSVP-TE or PPR(preferred path = routing).

Kind regards= =C2=A0

Gyan=C2=A0
<= div>
On= Sat, May 9, 2020 at 9:25 PM Wang, Weibin (NSB - CN/Shanghai) <weibin.wang@nokia-sbell.com>= wrote:

Jeff, I see what you said, thank you for sharing inf= ormation;

=C2=A0

=C2=A0

=C2=A0

Cheers!

=C2=A0

Wang Weibin

=C2=A0

From: Jeff Tantsura <jefftant.ietf@gmail.com> Sent: 2020=E5=B9=B45= =E6=9C=8810=E6=97=A5 3:24
To: Wang, Weibin (NSB - CN/Shanghai) <weibin.wang@nokia-sbell.com> Cc: Ketan Talaulikar (ketant) <ketant@cisco.com>; lsr@ietf.org
Subject: Re: [Lsr] draft-ietf-lsr-flex-algo

=C2=A0

Weibin,

=C2=A0

One could have an algo with MSD/ERLD as optimization= s constrains, would be quite similar to colored links. Note - ERLD has impl= emented node capabilities only, so all links on a node will have to be prun= ed.

The tradeoffs are - having centralized controller wi= th global view computing a path that meets the constraints(classical BGP-LS= + PCEP scenario) vs building a dynamic topology of connected nodes that me= et a set of constrains, in first case, change in topology/capabilities would cause path recalculation/reoptimizat= ion on the PCE while in the second - IGP would recompute the topology local= ly.

=C2=A0

Regards,

Jeff



On May 9, 2020, at 01= :27, Wang, Weibin (NSB - CN/Shanghai) <weibin.wang@nokia-sbell.com> wrote:<= u>

=EF=BB=BF

Ketan, thank you for clarification.

=C2=A0

=C2=A0

=C2=A0

Cheers!

=C2=A0

Wang Weibin

=C2=A0

From: Ketan Talaulikar (ketant) <ketant@cisco.com>
Sent: 2020=E5=B9=B45= =E6=9C=889=E6=97=A5 14:52
To: Wang, Weibin (NSB - CN/Shanghai) <weibin.wang@nokia-sbell.com>; lsr@ietf.org
Subject: RE: draft-ietf-lsr-flex-algo

=C2=A0

Hi Wang,

=C2=A0

You are correct. Though I would= n=E2=80=99t call it a goal but rather a benefit/advantage =E2=80=93 same ap= plies to SR-MPLS where the label stack can be reduced.=

=C2=A0

Thanks,

Ketan

=C2=A0

From: Lsr <lsr-bounces@ietf.org> On Behalf Of Wang, Weibin (NSB - CN/Shanghai)
Sent: 08 May 2020 19:07
To: lsr@ietf.org
Subject: [Lsr] draft-ietf-lsr-flex-algo

=C2=A0

Hi authors:

=C2=A0

After reading through this draft lsr-flex-algo, I wa= nt to know whether there is a potential goal of this draft to reduce the SR= H size with enabling flex-algo with admin group in SRv6 deployment, because= without flex-algo we have to have a big SRH size when the SRH include more SRv6 SIDs, if we enable flex-algo= under special topology and link constraint condition, in theory we can eve= n construct =C2=A0a end to end SR path/tunnel without SRH, but it still mee= t TE requirement. So my question is whether the flex-algo can be used as tool to reduce SRH size?

=C2=A0

=C2=A0

=C2=A0

Cheers !

=C2=A0

WANG Weibin

_______________________________________________
Lsr mailing list
Lsr@ietf.org
htt= ps://www.ietf.org/mailman/listinfo/lsr

_______________________________________________
Lsr mailing list
Lsr@ietf.org
https://www.ietf.org/mailman/listinfo/lsr
--
<= div dir=3D"ltr">

Gyan= =C2=A0 Mishra

Network Engineering & Technology= =C2=A0

Verizon=C2=A0

Silver Spring, MD 20= 904

Phone: 301 502-1347

<= font size=3D"1" color=3D"#000000" face=3D"georgia, serif">Email: gyan.s.mishra@verizon.= com



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Mon, 18 May 2020 23:19:01 -0700 (PDT) MIME-Version: 1.0 References: <24209_1588692477_5EB185FD_24209_35_1_53C29892C857584299CBF5D05346208A48E3D455@OPEXCAUBM43.corporate.adroot.infra.ftgroup> <6287_1588771252_5EB2B9B4_6287_332_1_53C29892C857584299CBF5D05346208A48E3F698@OPEXCAUBM43.corporate.adroot.infra.ftgroup> <10562_1588775602_5EB2CAB2_10562_251_11_53C29892C857584299CBF5D05346208A48E3FB63@OPEXCAUBM43.corporate.adroot.infra.ftgroup> <87CDE7F3-E08D-4C45-9AF1-9DAD635F8908@chopps.org> <9992_1588784982_5EB2EF56_9992_201_1_53C29892C857584299CBF5D05346208A48E40256@OPEXCAUBM43.corporate.adroot.infra.ftgroup> <6544_1588843052_5EB3D22C_6544_99_1_53C29892C857584299CBF5D05346208A48E415A8@OPEXCAUBM43.corporate.adroot.infra.ftgroup> <26975_1588867353_5EB43119_26975_5_1_53C29892C857584299CBF5D05346208A48E423B4@OPEXCAUBM43.corporate.adroot.infra.ftgroup> <31044_1589805734_5EC282A6_31044_440_1_53C29892C857584299CBF5D05346208A48E6052C@OPEXCAUBM43.corporate.adroot.infra.ftgroup> In-Reply-To: <31044_1589805734_5EC282A6_31044_440_1_53C29892C857584299CBF5D05346208A48E6052C@OPEXCAUBM43.corporate.adroot.infra.ftgroup> From: Gyan Mishra Date: Tue, 19 May 2020 02:18:50 -0400 Message-ID: To: bruno.decraene@orange.com Cc: Christian Hopps , "Les Ginsberg (ginsberg)" , "lsr@ietf.org" Content-Type: multipart/alternative; boundary="00000000000069d16505a5fa41f0" Archived-At: Subject: Re: [Lsr] Flooding across a network X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 19 May 2020 06:19:08 -0000 --00000000000069d16505a5fa41f0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Mon, May 18, 2020 at 8:42 AM wrote: > Hello Gyan, > > > > Nice to know that fast LSP flooding is important to you. > > You are right that there are existing code and knobs to improve IGP > convergence in general, and in particular to the specific implementation > you are referring to (I=E2=80=99d bet that its first letter start with C)= . > > Focusing on efficient flooding, which is the subject of this thread, > =E2=80=9Cfast-flood x=E2=80=9D is indeed a nice name. AFAIR, the feature = has been > introduced approximately 15 years ago and was indeed an improvement. Many > more have been introduced as part of the fast IGP convergence project tha= t > I=E2=80=99d been running in this company, resulting in very significant a= nd much > needed improvement on that implementation. > > Despite the name =E2=80=9Cfast flood=E2=80=9D, I don=E2=80=99t think that= anyone is claiming that > it=E2=80=99s solving the broad issue of efficient LSP flooding. > > LSP-pacing may also be configured in order to influence the delay between > two consecutively sent LSP. > > > > One question, which you have likely faced when enabling these knobs, is > the right values to configure, depending on the receiver (=E2=80=99s capa= bility) > If you have multiple implementation on the sender side =E2=80=93with differ= ent ways > to implement =E2=80=98fast flooding=E2=80=99- and different platforms (= =E2=80=98s capability) on > the receiver side, combined with various usages (e.g. from 2 to 50 IGP > adjacencies, with or without BGP/RSVP-TE/multicast=E2=80=A6.) the matrix = is quickly > getting significant. Your vendor of the receiver implementation may help > you; or not (significantly). > Gyan> I completely understand the issue and that makes sense that with the variables thrown out there with a mixed vendor environment with a variety of platforms and sender flooding capability, and the receiver receiving the flooded LSP capability to be processed during its local SPF and overrunning the receivers. So this is a real world worst case scenario which can happen with flow control and how to deal with the resulting slow convergence and sub optimal routing with micro loops. Got it. Thank you for the explanation. > With IS-IS, the problem is exacerbated because the protocol is typically > vital to the network and all its usages and customers. So nobody wants to > be held accountable if the parameters turned to be =E2=80=98non-optimal= =E2=80=99 over the > next decade. Especially as routing =E2=80=98incidents=E2=80=99 may alread= y happen with > default configuration. > > Gyan> Default change are painful for operators but unfortunately they d= o > happen and throw off any tuning or standard template deployed. > > > > Sending fast is =E2=80=9Ceasy=E2=80=9D, but what we need is an effective = communication > between the two entities involved: one sender and a receiver; sometimes > referred to as goodput. RFC 2914 =E2=80=9CCongestion Control Principles= =E2=80=9D [1] may > be an introduction to this. > > e.g. you can probably speak English to me at 200-250 words per minutes bu= t > I can assure you that it would be more effective to speak to me at a lowe= r > rate, because of limitations on the receiver side. > > That=E2=80=99s similar for machines in general and IS-IS in particular, e= specially > since IS-IS is not that fast to recover from lost LSPs. > > The problem is not new and referred to as flow control. From [2] =E2=80= =9CIn data > communications , *flow > control* is the process of managing the rate of data transmission between > two nodes to prevent a fast sender from overwhelming a slow receiver. It > provides a mechanism for the receiver to control the transmission speed, = so > that the receiving node is not overwhelmed with data from transmitting > node.=E2=80=9D > > > > That=E2=80=99s what we are working on. > > Gyan> Makes sense. > > Kind regards, > > Bruno > > > > [1] https://tools.ietf.org/html/rfc2914 > > [2] https://en.wikipedia.org/wiki/Flow_control_(data) > > > > > > > > *From:* Gyan Mishra [mailto:hayabusagsm@gmail.com] > *Sent:* Sunday, May 17, 2020 11:07 AM > *To:* DECRAENE Bruno TGI/OLN > *Cc:* Christian Hopps; Les Ginsberg (ginsberg); lsr@ietf.org > *Subject:* Re: [Lsr] Flooding across a network > > > > > > Am reading through this thread late but want to chime in on the discussio= n. > > > > Router Isis > > fast-flood x > > > > The concept of ISIS fast flooding has been around for decades and is > critical for ISIS LSDB synchronization to so all nodes have all prefixes = to > avoid micro loops and within the network. > > > > The concept of fast flood feature is basically to flood the number of LSP= s > that need to be flooded before starting the local SPF. So with fast floo= d > enabled all nodes in the domain wait till the last LSP is flooded before = it > runs its local SPF. By fast flooding it reduces the overall number of SP= Fs > executed and allows the LSDB to be synchronized by all nodes in the domai= n. > > > > Let=E2=80=99s say a link went down or came up topology change. The route= r should > at a minimum flood at least that LSP that triggered the SPF before runnin= g > its local SPF. Fast flooding is recommended by all vendors as it improve= s > convergence times and limits duration of LSDB inconsistencies during whic= h > time micro loops form. > > > > In case where a few routers don=E2=80=99t have fast flood enabled, those = few > router in slow mode may have to run multiple SPFs before completely being > synchronized. I think that question where a mix of slow and fast exist > versus all slow or all fast you may have mixed unpredictable behaviors th= at > you really would have to test out in a lab or live network. > > > > In my experience I have always had all nodes running fast flood mode as > the feature has been around for a long time and recommended for optimal > convergence. > > > > There are many other parameters with ISIS that come into play to optimize > convergence below which may vary by vendor but can improve convergence an= d > minimize micro loops below: > > > > One of them is setting all P2P routed links to circuit type point-to-poin= t > to avoid DIS election. > > > > Both ISIS and OSPF have the iSPF incremental SPF so only the changed part > of the tree is updated and not the entire tree to save on SPF processing. > > > > With short spf interval and spf delay the local spf May start before the > lsp that triggered the spf is flooded. > > > > Lsp pacing can be used to speed up end to end flooding. > > > > Hello padding TLV 8 for MTU defection to help with convergence so max > number of LSPs can be sent during flooding. > > > > Increase lsp lifetime to maximum to reduce control traffic so cpu can be > optimized to refresh lsp=E2=80=99s > > > > Reduce the frequency of periodic lsp flooding of topology to reduce link > utilization by Isis > > > > Ignore lsp errors instead of purging them > > > > Carful balance of event processing and throttling of events to maximize > convergence times > > > > Prefix prioritization on critical prefixes such as MPLS FEC binding. > > > > LFA and RLFA for pre computed backup paths > > > > BFD for ms failure detection > > > > Overall Isis as far as scalability far exceeds ospf with stability with > domains with a very large number of nodes in the 100s and high number of > adjacencies per node. > > > > As far as stability and convergence both ospf and Isis are equivalent fro= m > my experience. > > > > Kind regards > > > > Gyan > > Verizon > > > > On Thu, May 7, 2020 at 12:03 PM wrote: > > Les, > > > > > > *From:* Les Ginsberg (ginsberg) [mailto:ginsberg@cisco.com] > *Sent:* Thursday, May 7, 2020 4:55 PM > *To:* DECRAENE Bruno TGI/OLN > *Cc:* lsr@ietf.org; Christian Hopps > *Subject:* RE: [Lsr] Flooding across a network > > > > Bruno =E2=80=93 > > > > I have specifically used an example where =E2=80=9Cmicroloop avoidance=E2= =80=9D is not > applicable. So I did not want to use the term =E2=80=9Cmicroloop=E2=80=9D= but rather used > =E2=80=9Cloop=E2=80=9D so as not to suggest that =E2=80=9Cmicroloop avoid= ance=E2=80=9D is a potential > solution for the sub-optimal behavior. > > [Bruno] I=E2=80=99m not sure what you mean exactly by =E2=80=9Cmicroloop = avoidance=E2=80=9D. > > On my side, I mean =E2=80=9CLoop avoidance using Segment Routing=E2=80=9D= [1] which _*is*_ > applicable. (Note that I=E2=80=99m not saying that all _*implementations*= _ cover > all cases.) > > [1] > https://tools.ietf.org/html/draft-bashandy-rtgwg-segment-routing-uloop-08 > > > > > > Hope you can appreciate that point. > > > > It would be easy enough to include more nodes in the topology which only > support slow flooding. The end result would be the same. > > [Bruno] The question is whether the activation of fast flooding on one > (some) node(s)/IGP adjacency(es) may result in delaying the LSDB > synchronization network wide. It=E2=80=99s not about the number of slow n= odes. > > > > You seem to assume that we have a majority of fast nodes, and some > remaining slow nodes. In which cases I agree that in some cases the > overall/network wide behavior may be a slow LSDB sync. But not slower tha= n > with slow nodes only. > > I have kept the example simple in the hopes we could more easily agree > that what I describe can happen when not all nodes support faster floodin= g > =E2=80=93 which is the only point I am trying to make. > > [Bruno] If your point is that while we have slow nodes in the network, in > some cases the network wide behavior can be =E2=80=9Cslow=E2=80=9D, somew= here between =E2=80=9Call > nodes are fast=E2=80=9D and =E2=80=9Call nodes are slow=E2=80=9D, then I = agree with you. > > > > However what you said is: =E2=80=9Cwhen only some nodes in the network su= pport > faster flooding [=E2=80=A6] it prolongs the period of LSDB inconsistency= .=E2=80=9D > > In that sentence, I disagree with =E2=80=9Cprolongs=E2=80=9D which accord= ing to 2 > dictionaries means =E2=80=9Clasting longer=E2=80=9D. > > https://dictionary.cambridge.org/fr/dictionnaire/anglais/prolong > > https://www.merriam-webster.com/dictionary/prolong > > > > Because, at least to me, this reads as =E2=80=9CThe introduction of fast-= flooding > nodes in the network (may) increase the period of LSDB inconsistency.=E2= =80=9D > > > > Whether the ratio of Fast/Slow nodes is large or small or about the same > doesn=E2=80=99t eliminate the possibility that the same behavior could be= seen =E2=80=93 > though it might alter the location of the topology change which would be > problematic. > > > > From an operator=E2=80=99s POV, I am pretty sure that what you really car= e about > is whether packets get successfully forwarded or not. > > [Bruno] Yes, but let=E2=80=99s not combine multiple (complex) problems. > > Here I=E2=80=99d like we focus on LSP flooding and LSDB synchronization a= cross the > network. Plus this is exactly the point that you raised: =E2=80=9Cincreas= e the > period of LSDB inconsistency.=E2=80=9D > > > > I am demonstrating that it isn=E2=80=99t safe to assume forwarding behavi= or will > be optimal when not all nodes support fast flooding. > > [Bruno] Which is very different from your original point =E2=80=9Cwhen on= ly some > nodes in the network support faster flooding [=E2=80=A6] it prolongs the= period of > LSDB inconsistency.=E2=80=9D > > > > --Bruno > > > > Les > > > > > > *From:* bruno.decraene@orange.com > *Sent:* Thursday, May 07, 2020 2:18 AM > *To:* Les Ginsberg (ginsberg) > *Cc:* lsr@ietf.org; Christian Hopps > *Subject:* RE: [Lsr] Flooding across a network > > > > Les, > > > > > From: Les Ginsberg (ginsberg) [mailto:ginsberg@cisco.com > ] > > > > > > Bruno - > > > > > > I am sorry it has been so difficult for us to understand each other. I > am trying my best. > > +1 +1 > > > > > Look at it this way: > > > > > > You are the customer. =F0=9F=98=8A > > > I am the vendor. > > > > I'm not sure what (technical) point you are trying to make. > > > > Coming back to your statement : =E2=80=9Cwhen only some nodes in the netw= ork > support faster flooding [=E2=80=A6] it prolongs the period of LSDB incon= sistency > .=E2=80=9D > > Your example is flawed on two points: > > - Your performance indicator is "micro loop duration", while we are > talking about the duration of LSP flooding across the network. So the > metric should be "LSP flooding time" (or "period of LSDB inconsistency") > > - Your example is about one node doing slower flooding, while we are > interested in the case when one node support faster flooding. (It's quite > clear that if one node is slower, the end to end flooding time may be > longer. The point you are raising is when one node is doing faster floodi= ng) > > > > Can you fix your example on those 2 points? > > > > Thanks > > --Bruno > > > > > > > The failure scenario I describe below happens and you notice that all > Northbound destinations loop for 35 seconds whenever fast flooding is > enabled. > > > I think you are going to complain about this - to me. =F0=9F=98=8A > > > > > > And I am going to tell you that this is a consequence of enabling fast > flooding in the presence of a node which does not support it. Your option= s > to reduce the period of looping will be: > > > > > > 1)Upgrade the slow node to support faster flooding > > > 2)Disable fast flooding > > > 3)Redesign your network > > > > > > Les > > > > > > > -----Original Message----- > > > > From: bruno.decraene@orange.com > > > > Sent: Wednesday, May 06, 2020 10:10 AM > > > > To: Christian Hopps > > > > Cc: Les Ginsberg (ginsberg) ; lsr@ietf.org > > > > Subject: RE: [Lsr] Flooding across a network > > > > > > > > > From: Christian Hopps [mailto:chopps@chopps.org = ] > > > > > > > > > > Bruno persistence has made me realize something fundamental here. > > > > > > > > > > The minute the LSP originator changes the LSP and floods it you hav= e > LSDB > > > > inconsistency. > > > > > > > > Exactly my point. Thank you Chris. > > > > I would even say: "The minute the LSP originator changes the LSP then > you > > > > have LSDB inconsistency." But no big deal if there is disagreement on > this > > > > detail. > > > > > > > > > That is going to last until the last node in the network has update= d > it's LSDB. > > > > > > > > Absolutely. > > > > So the faster we flood, the shorter the LSBD inconsistency. > > > > > > > > Now IMO, even if a single/few nodes flood faster, there is a chance o= f > > > > shortening the LSDB inconsistency. But in all cases, I don't see how > this could > > > > make the LSDB inconsistency longer. > > > > > > > > > > > > > Les is pointing out that LSDB inconsistency can be bad in certain > > > > circumstances e.g., if a critical node is slow and thus inconsistent. > > > > > > > > > > I believe the right way to fix this is a simple one, help the > operator flag the > > > > broken router software/hardware for replacement, but otherwise IS-IS > > > > should just try to do the best job it can do to which is to flood > around the > > > > problem (i.e., flood as optimally as possible). > > > > > > > > +1 > > > > On a side note, I would not call a router flooding slowly as "broken"= . > I find it > > > > understandable that in a given network there are different type of > routers > > > > (core vs aggregation), different roles (P having 50 IGP adjacencies > with 50 PEs > > > > vs PE having only 2 IGP adjacencies with 2 P), different hardware > > > > generations, different software, different vendors with different > > > > perspectives/markets. > > > > > > > > Thank you Chris. > > > > > > > > --Bruno > > > > > > > > > > Thanks, > > > > > Chris. > > > > > [as WG member] > > > > > > > > > > > > > > > > On May 6, 2020, at 10:33 AM, bruno.decraene@orange.com wrote: > > > > > > > > > > > > Les, > > > > > > > > > > > > From: Les Ginsberg (ginsberg) [mailto:ginsberg@cisco.com > ] > > > > > > Sent: Wednesday, May 6, 2020 4:14 PM > > > > > > To: DECRAENE Bruno TGI/OLN > > > > > > Cc: lsr@ietf.org > > > > > > Subject: RE: Flooding across a network > > > > > > > > > > > > Bruno =E2=80=93 > > > > > > > > > > > > I am somewhat at a loss to understand your comments. > > > > > > The example is straightforward and does not need to consider FIB > update > > > > time nor the ordering of prefix updates on different nodes. > > > > > > [Bruno] The example is straightforward but you are referring to > FIB and IP > > > > packets forwarding as per those FIBs. > > > > > > I=E2=80=99d like we focus on LSP flooding and LSDB consistency. > > > > > > > > > > > > Consider the state of Node B and Node D at various time points > from the > > > > trigger event. > > > > > > > > > > > > T+ 2 seconds: > > > > > > ----------------- > > > > > > B has received all LSP Updates. It triggers an SPF and for all > Northbound > > > > destinations previously reachable via C it installs paths via D. > > > > > > Let=E2=80=99s assume it take 5 seconds to update the forwarding p= lane. > > > > > > > > > > > > D has received 40 of the 1000 LSP updates. It triggers an SPF and > finds > > > > that all Northbound destinations are reachable via B-C. It makes no > changes > > > > to the forwarding plane. > > > > > > > > > > > > T+7 seconds > > > > > > ----------------- > > > > > > B has completed FIB updates. Traffic to all Northbound > destinations is > > > > being forwarded via D. > > > > > > > > > > > > D has now received 140 of the 1000 LSP updates. Entries in its > forwarding > > > > plane for Northbound destinations still point to B. > > > > > > > > > > > > We have a loop. > > > > > > > > > > > > T + 30 seconds > > > > > > -------------------- > > > > > > D has now received 600 of the 1000 LSP updates. Still no changes > to its > > > > forwarding plane. > > > > > > Traffic to Northbound destinations is still looping. > > > > > > > > > > > > T+ 50 seconds > > > > > > ------------------- > > > > > > D has finally received all 1000 LSP updates.. > > > > > > It triggers (another) SPF and calculates paths to Northbound > destinations > > > > via E. It begins to update its forwarding plane. > > > > > > Let=E2=80=99s assume this will take 5 seconds.. > > > > > > > > > > > > T + 55 seconds > > > > > > -------------------- > > > > > > D has completed forwarding plane updates =E2=80=93 no more loopin= g. > > > > > > > > > > > > That is all I am trying to illustrate. > > > > > > > > > > > > If you want to start arguing that node protecting LFAs + microloo= p > > > > avoidance could help (NOTE I explicitly took those out of the exampl= e > for > > > > simplicity) =E2=80=93 it is easy enough to change the example to incl= ude > multiple node > > > > failures or a node failure plus some northbound link failures on othe= r > nodes. > > > > > > [Bruno] I=E2=80=99m not talking about LFA/FRR. And with regards t= o > microloops > > > > avoidance, some algorithms can handle any graph transition so includi= ng > > > > multiple node failures. > > > > > > > > > > > > But again, let=E2=80=99s stick to LSP flooding and LSDB consisten= cy. (you > are the > > > > one speaking about microloops in the forwarding plane). > > > > > > > > > > > > The point here is to look at the impact of long-lived LSDB > inconsistency > > > > which results when some nodes support flooding an order of magnitude > > > > faster flooding than other nodes =E2=80=93 which is what you asked me= to > clarify. > > > > > > [Bruno] No. I asked you to clarify why having a node with faster > flooding > > > > could prolongs the period of LSDB inconsistency. > > > > > > > > > > > > Again, with you own words: =E2=80=9Cwhen only some nodes in the n= etwork > > > > support faster flooding the behavior of the whole network may not be > > > > "better" when faster flooding is enabled because it prolongs the > period of > > > > LSDB inconsistency.=E2=80=9D > > > > > > And with less words: =E2=80=9Cwhen only some nodes in the network= support > > > > faster flooding [=E2=80=A6] it prolongs the period of LSDB inconsist= ency.=E2=80=9D > > > > > > > > > > > > --Bruno > > > > > > > > > > > > Les > > > > > > > > > > > > > > > > > > > > > > > > From: bruno.decraene@orange.com > > > > > > Sent: Wednesday, May 06, 2020 6:21 AM > > > > > > To: Les Ginsberg (ginsberg) > > > > > > Cc: lsr@ietf.org > > > > > > Subject: RE: Flooding across a network > > > > > > > > > > > > Les, > > > > > > > > > > > > From: Les Ginsberg (ginsberg) [mailto:ginsberg@cisco.com > ] > > > > > > Sent: Wednesday, May 6, 2020 1:35 AM > > > > > > To: DECRAENE Bruno TGI/OLN; lsr@ietf..org > > > > > > Subject: RE: Flooding across a network > > > > > > > > > > > > Bruno - > > > > > > > > > > > > Seems like it was not too long ago that we were discussing this i= n > person. > > > > Ahhh...the good old days... > > > > > > [Bruno] Indeed, may be not to the point of concluding. Indeed. > > > > > > > > > > > > First, let's agree that the interesting case does not involve 1 o= r > even a > > > > small number of LSPs. For those cases flooding speed does not matter. > > > > > > The interesting cases involve a large number of LSPs (hundreds or > > > > thousands). And in such cases LFA/microloop avoidance techniques are > not > > > > applicable. > > > > > > > > > > > > Take the following simple topology: > > > > > > > > > > > > | | ... | | > > > > > > +---+ +---+ > > > > > > | C | | E | > > > > > > +---+ +---+ > > > > > > | | 1000 > > > > > > +---+ +---+ > > > > > > | B |-------------| D | > > > > > > +---+ 1000 +---+ > > > > > > | | > > > > > > | | > > > > > > \ / > > > > > > \ / > > > > > > \ / > > > > > > \ / > > > > > > +---+ > > > > > > | A | > > > > > > +---+ > > > > > > > > > > > > There is a topology northbound of C and E (not shown) and a > topology > > > > southbound of A (not shown). > > > > > > Cost on all links is 10 except B-D and D-E where cost is high. > > > > > > > > > > > > C is a node with 1000 neighbors. > > > > > > When all links are up, shortest path for all northbound > destinations is via > > > > C. > > > > > > All nodes in the network support fast flooding except for Node D. > > > > > > Let=E2=80=99s say fast flooding is 500 LSPs/second and slow flood= ing (Node > D) is 20 > > > > LSPs/seconds. > > > > > > If Node C fails we have 1000 LSPs to flood. > > > > > > All nodes except for D can receive these in 2 seconds (plus > internode > > > > delay time). > > > > > > D can receive LSPs in 50 seconds. > > > > > > > > -- *Gyan Mishra* *Network Solutions A**rchitect * *M 301 502-134713101 Columbia Pike *Silver Spring, MD --00000000000069d16505a5fa41f0 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable


On Mon, May 18, 2020 at 8:42 AM <bruno.decraene@orange.com> wrote:

Hello Gyan,

=C2= =A0

Nice to kn= ow that fast LSP flooding is important to you.

You are ri= ght that there are existing code and knobs to improve IGP convergence in general, and in particular to the specific implementation you are refer= ring to (I=E2=80=99d bet that its first letter start with C).=

Focusing o= n efficient flooding, which is the subject of this thread, =E2=80=9Cfast-fl= ood x=E2=80=9D is indeed a nice name. AFAIR, the feature has been introduced a= pproximately 15 years ago and was indeed an improvement. Many more have bee= n introduced as part of the fast IGP convergence project that I=E2=80=99d b= een running in this company, resulting in very significant and much needed improvement on that implementation.

Despite th= e name =E2=80=9Cfast flood=E2=80=9D, I don=E2=80=99t think that anyone is c= laiming that it=E2=80=99s solving the broad issue of efficient LSP flooding.

LSP-pacing= may also be configured in order to influence the delay between two consecu= tively sent LSP.

=C2= =A0

One questi= on, which you have likely faced when enabling these knobs, is the right values to configure, depending on the receiver (=E2=80=99s capability)

=

If you hav= e multiple implementation on the sender side =E2=80=93with different ways t= o implement =E2=80=98fast flooding=E2=80=99- and different platforms (=E2=80=98s capab= ility) on the receiver side, combined with various usages (e.g. from 2 to 5= 0 IGP adjacencies, with or without BGP/RSVP-TE/multicast=E2=80=A6.) the mat= rix is quickly getting significant. Your vendor of the receiver implementation may help you; or not (significantly).

=C2=A0 =C2=A0Gyan> I completely understa= nd the issue and that makes sense that with the variables thrown out there = with a mixed vendor environment with a variety of platforms and sender floo= ding capability, and the receiver receiving the flooded LSP capability to b= e processed during its local SPF and overrunning the receivers.=C2=A0 So th= is is a real world worst case scenario which can happen with flow control a= nd how to deal with the resulting slow convergence and sub optimal routing = with micro loops. Got it. =C2=A0

Thank you for the explanation.

With IS-IS= , the problem is exacerbated because the protocol is typically vital to the network and all its usages and customers. So nobody wants to be held a= ccountable if the parameters turned to be =E2=80=98non-optimal=E2=80=99 ove= r the next decade. Especially as routing =E2=80=98incidents=E2=80=99 may al= ready happen with default configuration.

=C2= =A0Gyan> =C2=A0Default change are painful for operators but unfortunatel= y they do happen and throw off any tuning or standard template deployed.=

=C2= =A0

Sending fa= st is =E2=80=9Ceasy=E2=80=9D, but what we need is an effective communicatio= n between the two entities involved: one sender and a receiver; sometimes referred to as= goodput. RFC 2914 =E2=80=9CCongestion Control Principles=E2=80=9D [1= ] may be an introduction to this.

e.g. you c= an probably speak English to me at 200-250 words per minutes but I can assure you that it would be more effective to speak to me at a lower rate,= because of limitations on the receiver side.

That=E2=80= =99s similar for machines in general and IS-IS in particular, especially si= nce IS-IS is not that fast to recover from lost LSPs.

The proble= m is not new and referred to as flow control. From [2] =E2=80=9CIn data commun= ications, flow control is the process of managing the rate of data transmissio= n between two nodes to prevent a fast sender from overwhelming a slow recei= ver. It provides a mechanism for the receiver to control the transmission s= peed, so that the receiving node is not overwhelmed with data from transmitting node.=E2=80=9D

=C2= =A0

That=E2=80= =99s what we are working on.

=C2= =A0Gyan> =C2=A0Makes sense. =C2=A0

Kind regar= ds,

Bruno

=C2= =A0

[1] https://t= ools.ietf.org/html/rfc2914

[2] https://en.wikipedia.org/wiki/Flow_control_(data)

=C2= =A0

=C2= =A0

=C2= =A0

From: Gyan Mishra [mailto:hayabusagsm@gmail.co= m]
Sent: Sunday, May 17, 2020 11:07 AM
To: DECRAENE Bruno TGI/OLN
Cc: Christian Hopps; Les Ginsberg (ginsberg); lsr@ietf.org
Subject: Re: [Lsr] Flooding across a network

=C2=A0

=C2=A0

Am reading through this= thread late but want to chime in on the discussion.

=C2=A0

Router Isis=C2=A0

fast-flood x<= /u>

=C2=A0

The concept of ISIS fas= t flooding has been around for decades and is critical for ISIS LSDB synchr= onization to so all nodes have all prefixes to avoid micro loops and within= the network. =C2=A0

=C2=A0

The concept of fast flo= od feature is basically to flood the number of LSPs that need to be flooded= before starting the local SPF.=C2=A0 So with fast flood enabled all nodes = in the domain wait till the last LSP is flooded before it runs its local SPF.=C2=A0 By fast flooding it reduces the overal= l number of SPFs executed and allows the LSDB to be synchronized by all nod= es in the domain.

=C2=A0

Let=E2=80=99s say a lin= k went down or came up topology change.=C2=A0 The router should at a minimu= m flood at least that LSP that triggered the SPF before running its local S= PF.=C2=A0 Fast flooding is recommended by all vendors as it improves convergence times and limits duration of LSDB inconsistenci= es during which time =C2=A0micro loops form.

=C2=A0

In case where a few rou= ters don=E2=80=99t have fast flood enabled, those =C2=A0few router in slow = mode may have to run multiple SPFs before completely being synchronized.=C2= =A0 I think that question where a mix of slow and fast exist versus all slow or all fast you may have mixed unpredictable behavio= rs that you really would have to test out in a lab or live network.<= u>

=C2=A0

In my experience I have= always had all nodes running fast flood mode as the feature has been aroun= d for a long time and recommended for optimal convergence.

=C2=A0

There are many other pa= rameters with ISIS that come into play to optimize convergence below which = may vary by vendor but can improve convergence and minimize micro loops bel= ow:

=C2=A0

One of them is setting = all P2P routed links to circuit type point-to-point to avoid DIS election.<= u>

=C2=A0

Both ISIS and OSPF have= the iSPF incremental SPF so only the changed part of the tree is updated a= nd not the entire tree to save on SPF processing.

=C2=A0

With short spf interval= and spf delay the local spf May start before the lsp that triggered the sp= f is flooded.

=C2=A0

Lsp pacing can be used = to speed up end to end flooding.

=C2=A0

Hello padding TLV 8 for= MTU defection to help with convergence so max number of LSPs can be sent d= uring flooding.

=C2=A0

Increase lsp lifetime t= o maximum to reduce control traffic so cpu can be optimized to refresh lsp= =E2=80=99s

=C2=A0

Reduce the frequency of= periodic lsp flooding of topology to reduce link utilization by Isis=C2=A0=

=C2=A0

Ignore lsp errors inste= ad of purging them=C2=A0

=C2=A0

Carful balance of event= processing and throttling of events to maximize convergence times=C2=A0=

=C2=A0

Prefix prioritization o= n critical prefixes such as MPLS FEC binding.

=C2=A0

LFA and RLFA for pre co= mputed backup paths=C2=A0

=C2=A0

BFD for ms failure dete= ction=C2=A0

=C2=A0

Overall Isis as far as = scalability far exceeds ospf with stability with domains with a very large = number of nodes in the 100s and high number of adjacencies per node. =C2=A0=

=C2=A0

As far as stability and= convergence both ospf and Isis are equivalent from my experience.

=C2=A0

Kind regards=C2=A0

=C2=A0

Gyan

Verizon=C2=A0=

=C2=A0

On Thu, May 7, 2020 at = 12:03 PM <bruno.decraene@orange.com> wrote:

Les,

=C2=A0

=C2=A0

From: Les Ginsberg (ginsberg) [mailto= :ginsberg@cisco.com= ]
Sent: Thursday, May 7, 2020 4:55 PM
To: DECRAENE Bruno TGI/OLN
Cc: lsr@ietf.org; Christian Hopps
Subject: RE: [Lsr] Flooding across a network

=C2=A0

Bruno =E2=80=93

=C2=A0

I have specifically used an example where =E2=80=9Cmic= roloop avoidance=E2=80=9D is not applicable. So I did not want to use the t= erm =E2=80=9Cmicroloop=E2=80=9D but rather used =E2=80=9Cloop=E2=80=9D so a= s not to suggest that =E2=80=9Cmicroloop avoidance=E2=80=9D is a potential solution for the sub-optimal behavior.

[Bruno] I=E2=80=99m not sure w= hat you mean exactly by =E2=80=9Cmicroloop avoidance=E2=80=9D.

On my side, I mean =E2=80=9CLo= op avoidance using Segment Routing=E2=80=9D [1] which _is_ applicabl= e. (Note that I=E2=80=99m not saying that all _implementations_ cove= r all cases.)

[1] =C2=A0https://tools.ietf.org/html/draft-bashandy-rtgwg-segment-routing-u= loop-08

=C2=A0

=C2=A0

Hope you can appreciate that point.

=C2=A0

It would be easy enough to include more nodes in the t= opology which only support slow flooding. The end result would be the same.=

[Bruno] The question is whethe= r the activation of fast flooding on one (some) node(s)/IGP adjacency(es) may = result in delaying the LSDB synchronization network wide. It=E2=80=99s not about the number of slow nodes.

=C2=A0

You seem to assume that we hav= e a majority of fast nodes, and some remaining slow nodes. In which cases I= agree that in some cases the overall/network wide behavior may be a slow L= SDB sync. But not slower than with slow nodes only.

I have kept the example simple in the hopes we could m= ore easily agree that what I describe can happen when not all nodes support= faster flooding =E2=80=93 which is the only point I am trying to make.

[Bruno] If your point is that = while we have slow nodes in the network, in some cases the network wide beh= avior can be =E2=80=9Cslow=E2=80=9D, somewhere between =E2=80=9Call nodes a= re fast=E2=80=9D and =E2=80=9Call nodes are slow=E2=80=9D, then I agree with you.

=C2=A0

However what you said is: =E2= =80=9Cwhen only some nodes in the network support faster flooding [=E2=80= =A6]=C2=A0 it prolongs the period of LSDB inconsistency.=E2=80=9D=

In that sentence, I disagree w= ith =E2=80=9Cprolongs=E2=80=9D which according to 2 dictionaries means =E2= =80=9Clasting longer=E2=80=9D.

https://di= ctionary.cambridge.org/fr/dictionnaire/anglais/prolong=

https://www.merriam-webs= ter.com/dictionary/prolong

=C2=A0

Because, at least to me, this = reads as =E2=80=9CThe introduction of fast-flooding nodes in the network (m= ay) increase the period of LSDB inconsistency.=E2=80=9D

=C2=A0

Whether the ratio of Fast/Slow nodes is large or small= or about the same doesn=E2=80=99t eliminate the possibility that the same = behavior could be seen =E2=80=93 though it might alter the location of the = topology change which would be problematic.

=C2=A0

From an operator=E2=80=99s POV, I am pretty sure that = what you really care about is whether packets get successfully forwarded or= not.

[Bruno] Yes, but let=E2=80=99s= not combine multiple (complex) problems.

Here I=E2=80=99d like we focus= on LSP flooding and LSDB synchronization across the network. Plus this is = exactly the point that you raised: =E2=80=9Cincrease the period of LSDB inc= onsistency.=E2=80=9D

=C2=A0

I am demonstrating that it isn=E2=80=99t safe to assum= e forwarding behavior will be optimal when not all nodes support fast flood= ing.

[Bruno] Which is very differen= t from your original point =E2=80=9Cwhen only some nodes in the network sup= port faster flooding [=E2=80=A6]=C2=A0 it prolongs the period of LSDB incon= sistency.=E2=80=9D

=C2=A0

--Bruno

=C2=A0

=C2=A0=C2=A0 Les

=C2=A0

=C2=A0

From: bruno.decrae= ne@orange.com <bruno.decraene@orange.com>
Sent: Thursday, May 07, 2020 2:18 AM
To: Les Ginsberg (ginsberg) <ginsberg@cisco.com>
Cc: lsr@ietf.org; Christian Hopps <chopps@chopps.org>
Subject: RE: [Lsr] Flooding across a network

=C2=A0

Les,

=C2=A0

> From: Les Ginsberg (ginsb= erg) [mailto:ginsbe= rg@cisco.com]

>

> Bruno -<= /u>

>

> I am sorry it has been so= difficult for us to understand each other. I am trying my best.<= /u>

+1 +1

=C2=A0

> Look at it this way:

>

> You are the customer. =F0=9F=98=8A

> I am the vendor.

=C2=A0

I'm not sure what (technic= al) point you are trying to make.

=C2=A0

Coming back to your statement = : =E2=80=9Cwhen only some nodes in the network support fast= er flooding [=E2=80=A6]=C2=A0 it prolongs the period of LSDB inconsistency.= =E2=80=9D

Your example is flawed on two = points:

- Your performance indicator i= s "micro loop duration", while we are talking about the duration = of LSP flooding across the network. So the metric should be "LSP flooding time" (or "period of LSDB inconsistency")=

- Your example is about one no= de doing slower flooding, while we are interested in the case when one node support faster flood= ing. (It's quite clear that if one node is slower, the end to en= d flooding time may be longer. The point you are raising is when one node i= s doing faster flooding)

=C2=A0

Can you fix your example on th= ose 2 points?

=C2=A0

Thanks

--Bruno

=C2=A0

=C2=A0

> The failure scenario I de= scribe below happens and you notice that all Northbound destinations loop f= or 35 seconds whenever fast flooding is enabled.

> I think you are going to = complain about this - to me. =F0=9F=98=8A

>

> And I am going to tell yo= u that this is a consequence of enabling fast flooding in the presence of a= node which does not support it. Your options to reduce the period of looping will be:=

>

> 1)Upgrade the slow node t= o support faster flooding

> 2)Disable fast flooding

> 3)Redesign your network

>

=C2=A0=C2=A0=C2=A0=C2=A0> Les

>

> > -----Original Message-----<= /p>

> > From: bruno.decrae= ne@orange.com <bruno.decraene@orange.com>

> > Sent: Wednesday, May= 06, 2020 10:10 AM

> > To: Christian Hopps = <chopps@chopps.or= g>

> > Cc: Les Ginsberg (gi= nsberg) <ginsber= g@cisco.com>; lsr@ietf.org

> > Subject: RE: [Lsr] F= looding across a network

> >

> > > From: Christian= Hopps [mailto:chopp= s@chopps.org]

> > >

> > > Bruno persisten= ce has made me realize something fundamental here.

> > >

> > > The minute the = LSP originator changes the LSP and floods it you have LSDB=

> > inconsistency.

> >

> > Exactly my point. Th= ank you Chris.

> > I would even say: &q= uot;The minute the LSP originator changes the LSP then you=

> > have LSDB inconsiste= ncy." But no big deal if there is disagreement on this

> > detail.

> >

> > > That is going t= o last until the last node in the network has updated it's LSDB.=

> >

> > Absolutely.

> > So the faster we flo= od, the shorter the LSBD inconsistency.

> >

> > Now IMO, even if a s= ingle/few nodes flood faster, there is a chance of

> > shortening the LSDB = inconsistency. But in all cases, I don't see how this could

> > make the LSDB incons= istency longer.

> >

> >

> > > Les is pointing= out that LSDB inconsistency can be bad in certain

> > circumstances e.g., = if a critical node is slow and thus inconsistent.

> > >

> > > I believe the r= ight way to fix this is a simple one, help the operator flag the<= /u>

> > broken router softwa= re/hardware for replacement, but otherwise IS-IS

> > should just try to d= o the best job it can do to which is to flood around the

> > problem (i.e., flood= as optimally as possible).

> >

> > +1<= /u>

> > On a side note, I wo= uld not call a router flooding slowly as "broken". I find it

> > understandable that = in a given network there are different type of routers=

> > (core vs aggregation= ), different roles (P having 50 IGP adjacencies with 50 PEs

> > vs PE having only 2 = IGP adjacencies with 2 P), different hardware

> > generations, differe= nt software, different vendors with different

> > perspectives/markets= .

> >

> > Thank you Chris.

> >

> > --Bruno

> > >

> > > Thanks,<= u>

> > > Chris.

> > > [as WG member]<= /span>

> > >

> > >

> > > > On May 6, = 2020, at 10:33 AM, bruno.decrae= ne@orange.com wrote:

> > > ><= /u>

> > > > Les,

> > > ><= /u>

> > > > From: Les = Ginsberg (ginsberg) [mailto:ginsberg@cisco.com]

> > > > Sent: Wedn= esday, May 6, 2020 4:14 PM

> > > > To: DECRAE= NE Bruno TGI/OLN

> > > > Cc: lsr@ietf.org

> > > > Subject: R= E: Flooding across a network

> > > ><= /u>

> > > > Bruno =E2= =80=93

> > > ><= /u>

> > > > I am somew= hat at a loss to understand your comments.

> > > > The exampl= e is straightforward and does not need to consider FIB update=

> > time nor the orderin= g of prefix updates on different nodes.

> > > > [Bruno] Th= e example is straightforward but you are referring to FIB and IP<= /u>

> > packets forwarding a= s per those FIBs.

> > > > I=E2=80=99= d like we focus on LSP flooding and LSDB consistency.<= /p>

> > > ><= /u>

> > > > Consider t= he state of Node B and Node D at various time points from the=

> > trigger event.

> > > ><= /u>

> > > > T+ 2 secon= ds:

> > > > ----------= -------

> > > > B has rece= ived all LSP Updates. It triggers an SPF and for all Northbound

> > destinations previou= sly reachable via C it installs paths via D.

> > > > Let=E2=80= =99s assume it take 5 seconds to update the forwarding plane.=

> > > ><= /u>

> > > > D has rece= ived 40 of the 1000 LSP updates. It triggers an SPF and finds=

> > that all Northbound = destinations are reachable via B-C. It makes no changes

> > to the forwarding pl= ane.

> > > ><= /u>

> > > > T+7 second= s

> > > > ----------= -------

> > > > B has comp= leted FIB updates. Traffic to all Northbound destinations is<= u>

> > being forwarded via = D.

> > > ><= /u>

> > > > D has now = received 140 of the 1000 LSP updates. Entries in its forwarding

> > plane for Northbound= destinations still point to B.

> > > ><= /u>

> > > > We have a = loop.

> > > ><= /u>

> > > > T + 30 sec= onds

> > > > ----------= ----------

> > > > D has now = received 600 of the 1000 LSP updates. Still no changes to its=

> > forwarding plane.

> > > > Traffic to= Northbound destinations is still looping.

> > > ><= /u>

> > > > T+ 50 seco= nds

> > > > ----------= ---------

> > > > D has fina= lly received all 1000 LSP updates..

> > > > It trigger= s (another) SPF and calculates paths to Northbound destinations

> > via E. It begins to = update its forwarding plane.

> > > > Let=E2=80= =99s assume this will take 5 seconds..

> > > ><= /u>

> > > > T + 55 sec= onds

> > > > ----------= ----------

> > > > D has comp= leted forwarding plane updates =E2=80=93 no more looping.<= /u>

> > > ><= /u>

> > > > That is al= l I am trying to illustrate.

> > > ><= /u>

> > > > If you wan= t to start arguing that node protecting LFAs + microloop

> > avoidance could help= (NOTE I explicitly=C2=A0 took those out of the example for

> > simplicity) =E2=80= =93 it is easy enough to change the example to include multiple node=

> > failures or a node f= ailure plus some northbound link failures on other nodes.<= /u>

> > > > [Bruno] I= =E2=80=99m not talking about LFA/FRR. And with regards to microloops=

> > avoidance, some algo= rithms can handle any graph transition so including

> > multiple node failur= es.

> > > ><= /u>

> > > > But again,= let=E2=80=99s stick to LSP flooding and LSDB consistency. (you are the

> > one speaking about m= icroloops in the forwarding plane).

> > > ><= /u>

> > > > The point = here is to look at the impact of long-lived LSDB inconsistency

> > which results when s= ome nodes support flooding an order of magnitude

> > faster flooding than= other nodes =E2=80=93 which is what you asked me to clarify.=

> > > > [Bruno] No= . I asked you to clarify why having a node with faster flooding

> > could prolongs the p= eriod of LSDB inconsistency.

> > > ><= /u>

> > > > Again, wit= h you own words: =E2=80=9Cwhen only some nodes in the network=

> > support faster flood= ing the behavior of the whole network may not be

> > "better" w= hen faster flooding is enabled because it prolongs the period of<= /u>

> > LSDB inconsistency.= =E2=80=9D

> > > > And with l= ess words: =E2=80=9Cwhen only some nodes in the network support

> > faster flooding [=E2= =80=A6]=C2=A0 it prolongs the period of LSDB inconsistency.=E2=80=9D=

> > > >

> > > > --Bruno

> > > >

> > > >=C2=A0=C2=A0=C2=A0 Les=

> > > >

> > > >

> > > >

> > > > From: bruno.decrae= ne@orange.com <bruno.decraene@orange.com>

> > > > Sent: Wedn= esday, May 06, 2020 6:21 AM

> > > > To: Les Gi= nsberg (ginsberg) <ginsberg@cisco.com>

> > > > Cc: lsr@ietf.org

> > > > Subject: R= E: Flooding across a network

> > > ><= /u>

> > > > Les,

> > > ><= /u>

> > > > From: Les = Ginsberg (ginsberg) [mailto:ginsberg@cisco.com]

> > > > Sent: Wedn= esday, May 6, 2020 1:35 AM

> > > > To: DECRAE= NE Bruno TGI/OLN; lsr@ietf..org=

> > > > Subject: R= E: Flooding across a network

> > > ><= /u>

> > > > Bruno -

> > > ><= /u>

> > > > Seems like= it was not too long ago that we were discussing this in person.<= /u>

> > Ahhh...the good old = days...

> > > > [Bruno] In= deed, may be not to the point of concluding. Indeed.

> > > ><= /u>

> > > > First, let= 's agree that the interesting case does not involve 1 or even a<= u>

> > small number of LSPs= . For those cases flooding speed does not matter.

> > > > The intere= sting cases involve a large number of LSPs (hundreds or

> > thousands). And in s= uch cases LFA/microloop avoidance techniques are not

> > applicable.

> > > ><= /u>

> > > > Take the f= ollowing simple topology:

> > > ><= /u>

> > > >=C2=A0=C2= =A0=C2=A0 |=C2=A0 | ... |=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0 |

> > > >=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0 +---+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0 +---+

> > > >=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0 | C |=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0 | E |

> > > >=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0 +---+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0 +---+

> > > >=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 |=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 | 1000<= /u>

> > > >=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0 +---+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0 +---+

> > > >=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0 | B |-------------| D |

> > > >=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0 +---+=C2=A0=C2=A0 1000=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 = +---+

> > > >=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 |=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 |

> > > >=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 |=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 |

> > > >=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 \=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 /<= /p>

> > > >=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 \=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 /

> > > >=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 \=C2=A0 =C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0/

> > > >=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 \=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0 /

> > > >=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 +---+=

> > > >=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 | A |=

> > > >=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 +---+=

> > > ><= /u>

> > > > There is a= topology northbound of C and E (not shown) and a topology=

> > southbound of A (not= shown).

> > > > Cost on al= l links is 10 except B-D and D-E where cost is high.

> > > ><= /u>

> > > > C is a nod= e with 1000 neighbors.

> > > > When all l= inks are up, shortest path for all northbound destinations is via=

> > C.<= /u>

> > > > All nodes = in the network support fast flooding except for Node D.

> > > > Let=E2=80= =99s say fast flooding is 500 LSPs/second and slow flooding (Node D) is 20<= /span>

> > LSPs/seconds.=

> > > > If=C2=A0 N= ode C fails we have 1000 LSPs to flood.

> > > > All nodes = except for D can receive these in 2 seconds (plus internode

> > delay time).<= u>

> > > > D can rece= ive LSPs in 50 seconds.

> > > ><= /u>

--


Gyan M= ishra

<= font face=3D"georgia, serif" style=3D"color:black;font-size:1em">Network= Solutions Ar= chitect=C2=A0

M 301 502-1347
1310= 1 Columbia Pike=C2=A0
Silver Spring, MD


--00000000000069d16505a5fa41f0-- From nobody Mon May 18 23:40:15 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 234063A1256 for ; Mon, 18 May 2020 23:40:14 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -0.187 X-Spam-Level: X-Spam-Status: No, score=-0.187 tagged_above=-999 required=5 tests=[DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_REMOTE_IMAGE=0.01, URIBL_BLOCKED=0.001] autolearn=unavailable autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id c99KyTmZn_Nl for ; Mon, 18 May 2020 23:40:09 -0700 (PDT) Received: from mail-il1-x12f.google.com (mail-il1-x12f.google.com [IPv6:2607:f8b0:4864:20::12f]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id CE0173A1232 for ; Mon, 18 May 2020 23:40:08 -0700 (PDT) Received: by mail-il1-x12f.google.com with SMTP id b71so12325374ilg.8 for ; Mon, 18 May 2020 23:40:08 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=c4KGUhLTQXC0/xJWm5kwa79tCZrITlryrm3ll9CJgeY=; b=E/L7zTdK/vqWORRW5nBHj8LqHdQKw2Y1YVDgeDdhLN2AEbBo1J/nwHMM+VXuPEkAhU 8sCm6hd5mRlzHZBuyD5/1eXfC2voa9DU4tf9Tk0EDQ3Qzhnw3hnI526JQoatC8ZocVkz WnhmhpN+nDNiTcPHC9kPuFkln6hGyd2DIeoZQDryOVrpNahg2nIKGGs72YMulagq/uzA houyoMB0M4bWdjcmzcSCDM1WIIx02CR1fU2j70p4MNLJZGUudfP1zfrXxDr/r240+buS 3nyBExb/8kwNatkvzM/wHcFNup40y1n+ILA0Ys1crrFyyiBF5VsqbtFpLbjL2mCNxUAH fM6A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=c4KGUhLTQXC0/xJWm5kwa79tCZrITlryrm3ll9CJgeY=; b=g+Btx6bFbkL+ilRL2LCFz811JSft7EPkJ6lnr4jIhlc1F6BCOjfDfc6X9zEdwHwMuf 1h2swvHWr5WHQeOwq7VhQuWys0ahrTq5bebRHuqRWIQVZmXsyU7mm0Y4VaNQ+IkFyBtL ZN1rHqaGVxReHfzMRovP3tvMKH++Qn8IFwPQMZbccukuO95Fbd1OhZPELGbL7BvXVA3y C/6I//z1amn3Bp3aY/hJEcbWptXjYgE9C3vRtlt59Nefkxcrz1wuA/M6ufqBKfzDQAta baY3E989+sj4EmBu/KJc+VxsiKTGLA0DzgOVLAlyEsJyMjZf+iEFKa7K51vYb1d6qZUl PFqg== X-Gm-Message-State: AOAM530c+CBlYbSgBZJ+DBSulYeWa6QtSuLaoKslVhbX1rORSCJH/6gv vJ+/QNvmpTcJ84ogYM/SX5W3lvMEsf8cKcV75MKlB+IdQOg= X-Google-Smtp-Source: ABdhPJxIbmphOTu+Fcen1eeQAw2pHi5lsTp+VulBpw3qTxc6DYPQIF4MxT1wOXv3yY+G8vxCZN89zpqT2ykU/pV7mEU= X-Received: by 2002:a92:c948:: with SMTP id i8mr20418759ilq.258.1589870408092; Mon, 18 May 2020 23:40:08 -0700 (PDT) MIME-Version: 1.0 References: <63330FD6-EDE8-4938-AA85-948279C57E34@cisco.com> In-Reply-To: From: Gyan Mishra Date: Tue, 19 May 2020 02:39:45 -0400 Message-ID: To: Yanhe Fan Cc: "Acee Lindem (acee)" , "lsr@ietf.org" Content-Type: multipart/alternative; boundary="000000000000e9cfc705a5fa8c1c" Archived-At: Subject: Re: [Lsr] Flooding Topology Computation Algorithm - draft-cc-lsr-flooding-reduction-08 Working Group Adoption Call X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 19 May 2020 06:40:14 -0000 --000000000000e9cfc705a5fa8c1c Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable I support WG adoption and have a few questions related to the draft. Does this flooding algorithm use the dynamic flooding algorithm used in data center clos dense meshed topologies with many ECMP paths where the flood is decoupled from the physical topology. In the dynamic flooding algorithm mentioned in centralized mode the flooding is computed by the area leader and distributed to all nodes. In distributed mode each mode the area leader determines the algorithm and then each node computes the flooding topology based on the algorithm. This dynamic algorithm for optimized flood reduction would reduce the amount of redundant flooding in highly densely meshed ospf or Isis topologies. So this optimization of flooding would improving overall link state routing protocol convergence. Gyan On Mon, May 18, 2020 at 3:37 PM Yanhe Fan wrote: > Support it as a co-author. > > > > Thanks, > > Yanhe > > > > *From:* Lsr *On Behalf Of *Acee Lindem (acee) > *Sent:* Friday, May 15, 2020 3:40 PM > *To:* lsr@ietf.org > *Subject:* [Lsr] Flooding Topology Computation Algorithm - > draft-cc-lsr-flooding-reduction-08 Working Group Adoption Call > > > > This begins a 3 week (due to holidays) WG adoption call for the =E2=80=9C= Flooding > Topology Computation Algorithm=E2=80=9D draft. Please issue your support = or > objection to this list by 11:59 PM, UTC on June 5th, 2020. Here is a URL > for your convenience. > > > > https://datatracker.ietf.org/doc/draft-cc-lsr-flooding-reduction/ > > > > Thanks, > Acee > _______________________________________________ > Lsr mailing list > Lsr@ietf.org > https://www.ietf.org/mailman/listinfo/lsr > --=20 *Gyan Mishra* *Network Solutions A**rchitect * *M 301 502-134713101 Columbia Pike *Silver Spring, MD --000000000000e9cfc705a5fa8c1c Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable

I support WG adoption and have a few = questions related to the draft.

Does this flooding algorithm use the dynamic flooding algorithm u= sed in data center clos dense meshed topologies with many ECMP paths where = the flood is decoupled from the physical topology.=C2=A0 In the dynamic flo= oding algorithm mentioned in centralized mode the flooding is computed by t= he area leader and distributed to all nodes.=C2=A0 In distributed mode each= mode the area leader determines the algorithm and then each node computes = the flooding topology based on the algorithm. =C2=A0

This dynamic algorithm for optimized flood red= uction would reduce the amount of redundant flooding in highly densely mesh= ed ospf or Isis topologies.=C2=A0 So this optimization of flooding would im= proving overall link state routing protocol convergence.

Gyan=C2=A0

On Mon, May 18, 2020 at 3:37 PM = Yanhe Fan <yfan@casa-systems.co= m> wrote:

Support it as a co-au= thor.

=C2=A0<= /span>

Thanks,=

Yanhe

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--000000000000e9cfc705a5fa8c1c-- From nobody Tue May 19 00:38:14 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id D44AB3A12AA for ; Tue, 19 May 2020 00:38:12 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -7.701 X-Spam-Level: X-Spam-Status: No, score=-7.701 tagged_above=-999 required=5 tests=[DKIMWL_WL_MED=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, SPF_PASS=-0.001, URIBL_BLOCKED=0.001, USER_IN_DEF_DKIM_WL=-7.5] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=cisco.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 1FPMrNTA6xd4 for ; Tue, 19 May 2020 00:38:11 -0700 (PDT) Received: from aer-iport-1.cisco.com (aer-iport-1.cisco.com [173.38.203.51]) (using TLSv1.2 with cipher DHE-RSA-SEED-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id A67353A12A9 for ; Tue, 19 May 2020 00:38:10 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=5446; q=dns/txt; s=iport; t=1589873890; x=1591083490; h=subject:to:cc:references:from:message-id:date: mime-version:in-reply-to:content-transfer-encoding; bh=/6VFq9e8OVeN+dQduwbvT3TCRBNXRyPniueL6B0zAvk=; b=lUxR3Si/JWdFqI4J+2VQULtqoY34a8xppi0i795NPfL3OyzbgU1wXcyO I8eX4exXdBACPEs/REfko1dRUs0ZU3ZS6dG4qXZFEOkjIwop8X5UzCvxM OUSriAf0MMvE1xU49DsJCZIoqW97OUt6IhcIZo3emUAuzWdBz/k8J7nug w=; X-IronPort-AV: E=Sophos;i="5.73,409,1583193600"; d="scan'208";a="26332088" Received: from aer-iport-nat.cisco.com (HELO aer-core-4.cisco.com) ([173.38.203.22]) by aer-iport-1.cisco.com with ESMTP/TLS/DHE-RSA-SEED-SHA; 19 May 2020 07:38:09 +0000 Received: from [10.60.140.51] (ams-ppsenak-nitro2.cisco.com [10.60.140.51]) by aer-core-4.cisco.com (8.15.2/8.15.2) with ESMTP id 04J7c8ds009179; Tue, 19 May 2020 07:38:08 GMT To: Gyan Mishra , "Wang, Weibin (NSB - CN/Shanghai)" Cc: "lsr@ietf.org" , Jeff Tantsura , "Ketan Talaulikar (ketant)" References: <28938a998b384038b6dd513db00072cf@nokia-sbell.com> <48FED425-3613-42BD-9892-4CD6786EF1BB@gmail.com> From: Peter Psenak Message-ID: <17654e27-0efa-bcff-67ba-01541ebc350d@cisco.com> Date: Tue, 19 May 2020 09:38:08 +0200 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:60.0) Gecko/20100101 Thunderbird/60.7.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit X-Outbound-SMTP-Client: 10.60.140.51, ams-ppsenak-nitro2.cisco.com X-Outbound-Node: aer-core-4.cisco.com Archived-At: Subject: Re: [Lsr] draft-ietf-lsr-flex-algo X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 19 May 2020 07:38:13 -0000 Gyan, On 19/05/2020 03:52, Gyan Mishra wrote: > > Flex algo is usually mentioned in the context of SR-TE to help reduced > SRH size to circumvent MSD issues for both SRV6 and SR-MPLS, though segment list reduction may be seen as one of the benefits of the flex-algo, it is certainly not the primary motivation behind it. The primary motivation of flex-algo is to provide dynamic any to any constrained based routing. > however can > the 0-127 flex algo extensions since it’s an IGP extension used in any > pure IP network independent of SR flavors SR-MPLS or SRv6. SR/SRv6 is used as a dataplane. Any data plane can be used, if it provides a way to route an algo specific traffic. > > Also can flex algo be used in conjunction with RSVP-TE or PPR(preferred > path routing). same answer as above. thanks, Peter > > Kind regards > > Gyan > > On Sat, May 9, 2020 at 9:25 PM Wang, Weibin (NSB - CN/Shanghai) > > wrote: > > Jeff, I see what you said, thank you for sharing information;____ > > __ __ > > __ __ > > __ __ > > Cheers! > > ____ > > __ __ > > Wang Weibin____ > > __ __ > > *From:* Jeff Tantsura > > *Sent:* 2020年5月10日 3:24 > *To:* Wang, Weibin (NSB - CN/Shanghai) > > *Cc:* Ketan Talaulikar (ketant) >; lsr@ietf.org > *Subject:* Re: [Lsr] draft-ietf-lsr-flex-algo____ > > __ __ > > Weibin,____ > > __ __ > > One could have an algo with MSD/ERLD as optimizations constrains, > would be quite similar to colored links. Note - ERLD has implemented > node capabilities only, so all links on a node will have to be > pruned.____ > > The tradeoffs are - having centralized controller with global view > computing a path that meets the constraints(classical BGP-LS + PCEP > scenario) vs building a dynamic topology of connected nodes that > meet a set of constrains, in first case, change in > topology/capabilities would cause path recalculation/reoptimization > on the PCE while in the second - IGP would recompute the topology > locally.____ > > __ __ > > Regards,____ > > Jeff____ > > > > ____ > > On May 9, 2020, at 01:27, Wang, Weibin (NSB - CN/Shanghai) > > wrote:____ > > ____ > > Ketan, thank you for clarification.____ > > ____ > > ____ > > ____ > > Cheers!____ > > ____ > > Wang Weibin____ > > ____ > > *From:* Ketan Talaulikar (ketant) > > *Sent:* 2020年5月9日 14:52 > *To:* Wang, Weibin (NSB - CN/Shanghai) > >; lsr@ietf.org > > *Subject:* RE: draft-ietf-lsr-flex-algo____ > > ____ > > Hi Wang,____ > > ____ > > You are correct. Though I wouldn’t call it a goal but rather a > benefit/advantage – same applies to SR-MPLS where the label > stack can be reduced.____ > > ____ > > Thanks,____ > > Ketan____ > > ____ > > *From:* Lsr > > *On Behalf Of *Wang, Weibin (NSB - CN/Shanghai) > *Sent:* 08 May 2020 19:07 > *To:* lsr@ietf.org > *Subject:* [Lsr] draft-ietf-lsr-flex-algo____ > > ____ > > Hi authors:____ > > ____ > > After reading through this draft lsr-flex-algo, I want to know > whether there is a potential goal of this draft to reduce the > SRH size with enabling flex-algo with admin group in SRv6 > deployment, because without flex-algo we have to have a big SRH > size when the SRH include more SRv6 SIDs, if we enable flex-algo > under special topology and link constraint condition, in theory > we can even construct  a end to end SR path/tunnel without SRH, > but it still meet TE requirement. So my question is whether the > flex-algo can be used as tool to reduce SRH size?____ > > ____ > > ____ > > ____ > > /Cheers !/____ > > **____ > > *WANG Weibin*____ > > _______________________________________________ > Lsr mailing list > Lsr@ietf.org > https://www.ietf.org/mailman/listinfo/lsr____ > > _______________________________________________ > Lsr mailing list > Lsr@ietf.org > https://www.ietf.org/mailman/listinfo/lsr > > -- > > Gyan  Mishra > > Network Engineering & Technology > > Verizon > > Silver Spring, MD 20904 > > Phone: 301 502-1347 > > Email: gyan.s.mishra@verizon.com > > > From nobody Tue May 19 01:01:11 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 5A65E3A11F4; Tue, 19 May 2020 01:00:43 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -7.701 X-Spam-Level: X-Spam-Status: No, score=-7.701 tagged_above=-999 required=5 tests=[DKIMWL_WL_MED=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, SPF_PASS=-0.001, URIBL_BLOCKED=0.001, USER_IN_DEF_DKIM_WL=-7.5] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=cisco.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 4GpOWHBjVNOu; Tue, 19 May 2020 01:00:35 -0700 (PDT) Received: from aer-iport-3.cisco.com (aer-iport-3.cisco.com [173.38.203.53]) (using TLSv1.2 with cipher DHE-RSA-SEED-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 8F7763A0AF4; Tue, 19 May 2020 01:00:34 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=5451; q=dns/txt; s=iport; t=1589875235; x=1591084835; h=subject:to:cc:references:from:message-id:date: mime-version:in-reply-to:content-transfer-encoding; bh=KB1Nt6FRn3GPkWs1TGyBJ96gW2xxYJOrwfhxJph1a24=; b=MbwvJzK0lQp09/lEjK3qlwrpaY3azF+VFl3FWtECXBBLfG4I5DiZ4c16 KlX92W35BYbdiGxs6yg2xkznkH3WtVJCqlHc4H5Ns4IShBTXFzOqqhCCR 4c1ohe6domqZqPNc0buEOFhv/p1IO6227LoF2dGLPU9VLX/z9B0aKX6x5 8=; X-IronPort-AV: E=Sophos;i="5.73,409,1583193600"; d="scan'208";a="24002822" Received: from aer-iport-nat.cisco.com (HELO aer-core-1.cisco.com) ([173.38.203.22]) by aer-iport-3.cisco.com with ESMTP/TLS/DHE-RSA-SEED-SHA; 19 May 2020 08:00:32 +0000 Received: from [10.60.140.51] (ams-ppsenak-nitro2.cisco.com [10.60.140.51]) by aer-core-1.cisco.com (8.15.2/8.15.2) with ESMTP id 04J80WKK026244; Tue, 19 May 2020 08:00:32 GMT To: elwynd , "Acee Lindem (acee)" , Alvaro Retana , "gen-art@ietf.org" Cc: "last-call@ietf.org" , "draft-ietf-ospf-mpls-elc.all@ietf.org" , "lsr@ietf.org" References: <5ec2f7c9.1c69fb81.720d3.4998@mx.google.com> From: Peter Psenak Message-ID: <7ceab4da-eea2-c163-d8cc-a6c930dc37fb@cisco.com> Date: Tue, 19 May 2020 10:00:32 +0200 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:60.0) Gecko/20100101 Thunderbird/60.7.0 MIME-Version: 1.0 In-Reply-To: <5ec2f7c9.1c69fb81.720d3.4998@mx.google.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit X-Outbound-SMTP-Client: 10.60.140.51, ams-ppsenak-nitro2.cisco.com X-Outbound-Node: aer-core-1.cisco.com Archived-At: Subject: Re: [Lsr] Genart last call review of draft-ietf-ospf-mpls-elc-13 X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 19 May 2020 08:00:44 -0000 Elwyn, On 18/05/2020 23:02, elwynd wrote: > Hi. > > I am not convinced by the discussion that has ensued from my review. > > s3, para 3: > > If the router supports ELs on all of its interfaces, it SHOULD > advertise the ELC with every local host prefix it advertises in OSPF. > > - Both Acee amd I didn't immediately understand that 'every local host prefix' was not every > prefix that the router might advertise. It would be good to explain that this is the case. what exactly needs to be explained? The local property of the prefix? > > - As I previously stated, with a SHOULD it ought to be explained why one might not want to > advertise the ELC with some subset of the local host prefixes. SHOUDL is used not to say that one does it for subset of host prefixes, but rather because MUST can not be used for reasons mentioned earlier. From the functionality perspective it is sufficient to advertise it with a single local prefix. We specified for "every local prefix" to make it simpler. > > - Given that there are now two sets of prefixes, would/SHOULD/MUST ELC be advertised with the > prefixes that are not local host prefixes? no, only with local host prefixes. I can add "MUST NOT be advertised with any other prefix" if that's what you are after. > > s4, para 3: > > The absence of ERLD-MSD advertisements indicates only that the > advertising node does not support advertisement of this capability. > > Firstly, I cannot see why this statement or its absence might affect other EL mechanisms that > don't use OSPF to do signaling of ELC. It does not. All we say that if it is not advertised by OSPF, it means the router does not support the advertisement in OSPF. Nothing else. It has no effect on any other mechanisms that might be used to derive these capabilities. > > If I understand RFC 8662 correctly, if OSPF is being used to distribute ELC adverts and the ERLD > is not advertised by OSPF, then either the ERLD has to be supplied by other means or it will > effectively default to zero. > > Thus, I would suggest that the paragraph above should be replaced with: > > Advertisement of ERLD via OSPF using ERLD-MSD is OPTIONAL. If a router does not advertise > ERLD, then the EL positioning calculations described in [RFC8662] will assume a vaue of zero > for the ERLD of this router unless a different value is supplied by alternative means. I don't think we should be specifying anything that belongs to RFC8662 here in this draft. What we specify in this draft is how to advertise something in OSPF, not how this is being used, because this information is not used by OSPF. The usage of this info is outside of the scope of this draft and if anything needs to be added in that regard it should be done by updating the RFC8662. regards, Peter > > Regards, > > Elwyn > > Sent from Samsung tablet. > > > > -------- Original message -------- > From: "Acee Lindem (acee)" > Date: 14/05/2020 21:43 (GMT+00:00) > To: Alvaro Retana , "Peter Psenak (ppsenak)" > , Elwyn Davies , gen-art@ietf.org > Cc: last-call@ietf.org, draft-ietf-ospf-mpls-elc.all@ietf.org, lsr@ietf.org > Subject: Re: Genart last call review of draft-ietf-ospf-mpls-elc-13 > > Hi Alvaro, Elwyn, > > *From: *Alvaro Retana > *Date: *Thursday, May 14, 2020 at 3:46 PM > *To: *Acee Lindem , "Peter Psenak (ppsenak)" > , Elwyn Davies , > "gen-art@ietf.org" > *Cc: *"last-call@ietf.org" , > "draft-ietf-ospf-mpls-elc.all@ietf.org" > , "lsr@ietf.org" > *Subject: *Re: Genart last call review of draft-ietf-ospf-mpls-elc-13 > > Hi! > > Yes, we cannot specify something that routers unaware of this > specification should or shouldn’t do. > > I believe that Elwyn’s point is this: *if a router supports this > specification* then when would it not advertise the ELC?  IOW, the > specification only obviously applies to implementations that support it > — in that case I would think that if a router supports ELs on all of its > interfaces then it would always advertise the ELC, right? > > That’s true – but not advertising the OSPF capability could imply that > either ELC MSD or advertisement of the OSPF capability is not supported. > Although I might not have worded it as such, that was clear to me from > the text. Feel free to recommend alternate text if you feel it is > necessary. > > Thanks, > > Acee > > Thanks! > > Alvaro. > > On May 11, 2020 at 3:18:34 PM, Acee Lindem (acee) (acee@cisco.com > ) wrote: > > Note that the optionality of ERLD-MSD advertisements appears on > reflection to be a more serious issue than just an editorial nit. > > So what would you suggest? There are existing implementations that > support multipath forwarding entropy using MPLS entropy labels but > do not signal that capability in OSPF. We can't have a document that > retroactively mandates that they signal it. This wouldn't be > backward compatible. How can you possibly see this as a serious issue? > From nobody Tue May 19 01:33:13 2020 Return-Path: X-Original-To: lsr@ietf.org Delivered-To: lsr@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id F12F63A12D1; Tue, 19 May 2020 01:33:10 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: internet-drafts@ietf.org To: Cc: lsr@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 6.130.1 Auto-Submitted: auto-generated Precedence: bulk Reply-To: lsr@ietf.org Message-ID: <158987719092.24676.16508492303778769505@ietfa.amsl.com> Date: Tue, 19 May 2020 01:33:10 -0700 Archived-At: Subject: [Lsr] I-D Action: draft-ietf-ospf-te-link-attr-reuse-12.txt X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 19 May 2020 08:33:11 -0000 A New Internet-Draft is available from the on-line Internet-Drafts directories. This draft is a work item of the Link State Routing WG of the IETF. Title : OSPF Link Traffic Engineering Attribute Reuse Authors : Peter Psenak Les Ginsberg Wim Henderickx Jeff Tantsura John Drake Filename : draft-ietf-ospf-te-link-attr-reuse-12.txt Pages : 21 Date : 2020-05-19 Abstract: Existing traffic engineering related link attribute advertisements have been defined and are used in RSVP-TE deployments. Since the original RSVP-TE use case was defined, additional applications (e.g., Segment Routing Traffic Engineering, Loop Free Alternate) have been defined which also make use of the link attribute advertisements. In cases where multiple applications wish to make use of these link attributes the current advertisements do not support application specific values for a given attribute nor do they support indication of which applications are using the advertised value for a given link. This document introduces new link attribute advertisements in OSPFv2 and OSPFv3 which address both of these shortcomings. The IETF datatracker status page for this draft is: https://datatracker.ietf.org/doc/draft-ietf-ospf-te-link-attr-reuse/ There are also htmlized versions available at: https://tools.ietf.org/html/draft-ietf-ospf-te-link-attr-reuse-12 https://datatracker.ietf.org/doc/html/draft-ietf-ospf-te-link-attr-reuse-12 A diff from the previous version is available at: https://www.ietf.org/rfcdiff?url2=draft-ietf-ospf-te-link-attr-reuse-12 Please note that it may take a couple of minutes from the time of submission until the htmlized version and diff are available at tools.ietf.org. Internet-Drafts are also available by anonymous FTP at: ftp://ftp.ietf.org/internet-drafts/ From nobody Tue May 19 02:59:05 2020 Return-Path: X-Original-To: lsr@ietf.org Delivered-To: lsr@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id 379393A132A; Tue, 19 May 2020 02:59:02 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: Robert Wilton via Datatracker To: "The IESG" Cc: draft-ietf-ospf-mpls-elc@ietf.org, lsr-chairs@ietf.org, lsr@ietf.org, Acee Lindem , aretana.ietf@gmail.com, acee@cisco.com X-Test-IDTracker: no X-IETF-IDTracker: 6.130.1 Auto-Submitted: auto-generated Precedence: bulk Reply-To: Robert Wilton Message-ID: <158988234165.12066.13516127881736126146@ietfa.amsl.com> Date: Tue, 19 May 2020 02:59:02 -0700 Archived-At: Subject: [Lsr] Robert Wilton's No Objection on draft-ietf-ospf-mpls-elc-13: (with COMMENT) X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 19 May 2020 09:59:03 -0000 Robert Wilton has entered the following ballot position for draft-ietf-ospf-mpls-elc-13: No Objection When responding, please keep the subject line intact and reply to all email addresses included in the To and CC lines. (Feel free to cut this introductory paragraph, however.) Please refer to https://www.ietf.org/iesg/statement/discuss-criteria.html for more information about IESG DISCUSS and COMMENT positions. The document, along with other ballot positions, can be found here: https://datatracker.ietf.org/doc/draft-ietf-ospf-mpls-elc/ ---------------------------------------------------------------------- COMMENT: ---------------------------------------------------------------------- Hi, This is a straight forward document, thanks. Is there any associated YANG module required to manage this protocol enhancement? If so, is that already being worked or, or planned work for the WG? Regards, Rob From nobody Tue May 19 02:59:58 2020 Return-Path: X-Original-To: lsr@ietf.org Delivered-To: lsr@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id 2DFB73A0A03; Tue, 19 May 2020 02:59:56 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: Robert Wilton via Datatracker To: "The IESG" Cc: draft-ietf-isis-mpls-elc@ietf.org, lsr-chairs@ietf.org, lsr@ietf.org, Acee Lindem , aretana.ietf@gmail.com, acee@cisco.com X-Test-IDTracker: no X-IETF-IDTracker: 6.130.1 Auto-Submitted: auto-generated Precedence: bulk Reply-To: Robert Wilton Message-ID: <158988239572.13949.14887852526512456836@ietfa.amsl.com> Date: Tue, 19 May 2020 02:59:56 -0700 Archived-At: Subject: [Lsr] Robert Wilton's No Objection on draft-ietf-isis-mpls-elc-12: (with COMMENT) X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 19 May 2020 09:59:56 -0000 Robert Wilton has entered the following ballot position for draft-ietf-isis-mpls-elc-12: No Objection When responding, please keep the subject line intact and reply to all email addresses included in the To and CC lines. (Feel free to cut this introductory paragraph, however.) Please refer to https://www.ietf.org/iesg/statement/discuss-criteria.html for more information about IESG DISCUSS and COMMENT positions. The document, along with other ballot positions, can be found here: https://datatracker.ietf.org/doc/draft-ietf-isis-mpls-elc/ ---------------------------------------------------------------------- COMMENT: ---------------------------------------------------------------------- Hi, Same comment as for equivalent OSPF draft. Is there any associated YANG module required to manage this protocol enhancement? If so, is that already being worked or, or planned work for the WG? 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Tue, 19 May 2020 11:19:08 +0000 From: "Acee Lindem (acee)" To: "Rob Wilton (rwilton)" , The IESG CC: "draft-ietf-ospf-mpls-elc@ietf.org" , "lsr-chairs@ietf.org" , "lsr@ietf.org" , "aretana.ietf@gmail.com" Thread-Topic: Robert Wilton's No Objection on draft-ietf-ospf-mpls-elc-13: (with COMMENT) Thread-Index: AQHWLcQkBDMo31f08UCX338ZXvyL2qivAAcA Date: Tue, 19 May 2020 11:19:08 +0000 Message-ID: <6C7A8B8D-4B1F-4EB1-81A3-97028B8F4841@cisco.com> References: <158988234165.12066.13516127881736126146@ietfa.amsl.com> In-Reply-To: <158988234165.12066.13516127881736126146@ietfa.amsl.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: user-agent: Microsoft-MacOutlook/16.37.20051002 authentication-results: cisco.com; dkim=none (message not signed) header.d=none;cisco.com; dmarc=none action=none header.from=cisco.com; x-originating-ip: [75.138.220.47] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: cfd9f4e4-44af-4830-e1de-08d7fbe672f5 x-ms-traffictypediagnostic: BYAPR11MB3317: x-ms-exchange-transport-forked: True x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:8273; 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Tue, 19 May 2020 09:26:00 -0400 (EDT) From: Alissa Cooper Message-Id: Content-Type: multipart/alternative; boundary="Apple-Mail=_4C3BCE30-CDDD-47D3-B46E-B8C3665EE81A" Mime-Version: 1.0 (Mac OS X Mail 11.5 \(3445.9.5\)) Date: Tue, 19 May 2020 09:25:59 -0400 In-Reply-To: <08CE25A6-F1BF-49BF-8DF1-B947096F562F@cisco.com> Cc: "gen-art@ietf.org" , "lsr@ietf.org" , "draft-ietf-isis-mpls-elc.all@ietf.org" , "last-call@ietf.org" To: "Acee Lindem (acee)" , Mohit Sethi M References: <158771396796.16808.7505639544953079846@ietfa.amsl.com> <08CE25A6-F1BF-49BF-8DF1-B947096F562F@cisco.com> X-Mailer: Apple Mail (2.3445.9.5) Archived-At: Subject: Re: [Lsr] [Gen-art] Genart last call review of draft-ietf-isis-mpls-elc-11 X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 19 May 2020 13:26:08 -0000 --Apple-Mail=_4C3BCE30-CDDD-47D3-B46E-B8C3665EE81A Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=utf-8 Mohit, thanks for your review. Acee, thanks for your responses. I = entered a No Objection ballot. Alissa > On Apr 29, 2020, at 7:26 AM, Acee Lindem (acee) = wrote: >=20 > Hi Mohit,=20 > =20 > From: Mohit Sethi M > > Date: Wednesday, April 29, 2020 at 2:29 AM > To: Acee Lindem >, = "gen-art@ietf.org " > > Cc: "lsr@ietf.org " >, "draft-ietf-isis-mpls-elc.all@ietf.org = " = >, "last-call@ietf.org = " > > Subject: Re: Genart last call review of draft-ietf-isis-mpls-elc-11 > =20 > HI Acee, >=20 > On 4/24/20 3:38 PM, Acee Lindem (acee) wrote: >> Hi Mohit, >> =20 >> Speaking as document shepherd. See inline.=20 >> =20 >> On 4/24/20, 3:39 AM, "Mohit Sethi via Datatracker" = wrote: >> =20 >> Reviewer: Mohit Sethi >> Review result: Ready with Nits >> =20 >> I am the assigned Gen-ART reviewer for this draft. The General = Area >> Review Team (Gen-ART) reviews all IETF documents being processed >> by the IESG for the IETF Chair. Please treat these comments just >> like any other last call comments. >> =20 >> For more information, please see the FAQ at >> =20 >> = . >> =20 >> Document: draft-ietf-isis-mpls-elc-11 >> Reviewer: Mohit Sethi >> Review Date: 2020-04-24 >> IETF LC End Date: 2020-05-05 >> IESG Telechat date: Not scheduled for a telechat >> =20 >> Summary: This document specifies how Entropy Label Capability = (ELC) and Entropy >> Readable Label Depth (ERLD) are advertised using IS-IS. For = advertising ELC, a >> flag in the Prefix Attribute Flags is used. For advertising ERLD, = a Node MSD >> Advertisement is used. >> =20 >> Major issues: >> =20 >> Minor issues: The document is short and straightforward. For = someone like me >> who is not familiar with the routing area, would it make sense to = explain why >> signalling ELC information with MPLS is not sufficient (or what = are the >> benefits of advertising with IS-IS)? >> =20 >> I guess I'm wondering what you mean "signaling ELC information with = MPLS"? With segment routing, the IGPs can be the only choice for = signaling ELC capability. I don=E2=80=99t believe this comment requires = any action.=20 > I hope that you don't expect a gen-art reviewer to be an expert on = every topic. I certainly am NOT on expert on routing. I interpreted the = following text in the draft: >=20 >> It also >> introduces the concept of Entropy Label Capability (ELC) and = defines >> the signaling of this capability via MPLS signaling protocols. > to imply that signaling ELC information with MPLS is possible but this = draft defines a mechanism for signaling the same information with IS-IS. = Maybe the need for this is very obvious for those in the routing domain = in which case ignoring my comment is perfectly fine.=20 > =20 > Even though you are not an expert on routing, you should realize that = =E2=80=9Cwith MPLS=E2=80=9D and =E2=80=9Cvia MPLS signaling protocols=E2=80= =9D have very different connotations. If you reference section 3 of the = reference document [RFC6790], you=E2=80=99ll the MPLS signaling = protocols currently supporting ELC signaling. As I stated previously, = with segment routing none of these protocols are required for = deployment. > =20 > Thanks, > Acee > --Mohit >=20 >> =20 >> Thanks, >> Acee >> =20 >> =20 >> Nits/editorial comments: >> =20 >> In section 3, "used as the ECL Flag" should perhaps be "used as = the ELC Flag"? >> In section 4, "IANA for EARLD-MSD" should perhaps be "IANA for = ERLD-MSD"? >> In section 6, "ECL Flag (E-flag)." should perhaps be "ELC Flag = (E-flag)."? >> =20 >> =20 >> =20 > _______________________________________________ > Gen-art mailing list > Gen-art@ietf.org > https://www.ietf.org/mailman/listinfo/gen-art = --Apple-Mail=_4C3BCE30-CDDD-47D3-B46E-B8C3665EE81A Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=utf-8 Mohit, thanks for your review. Acee, thanks for your = responses. I entered a No Objection ballot.

Alissa
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charset="utf-8" Content-Transfer-Encoding: 8bit From: Roman Danyliw via Datatracker To: "The IESG" Cc: draft-ietf-isis-mpls-elc@ietf.org, lsr-chairs@ietf.org, lsr@ietf.org, Acee Lindem , aretana.ietf@gmail.com, acee@cisco.com X-Test-IDTracker: no X-IETF-IDTracker: 6.130.1 Auto-Submitted: auto-generated Precedence: bulk Reply-To: Roman Danyliw Message-ID: <158992568960.13432.13347004307272975200@ietfa.amsl.com> Date: Tue, 19 May 2020 15:01:29 -0700 Archived-At: Subject: [Lsr] Roman Danyliw's No Objection on draft-ietf-isis-mpls-elc-12: (with COMMENT) X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 19 May 2020 22:01:30 -0000 Roman Danyliw has entered the following ballot position for draft-ietf-isis-mpls-elc-12: No Objection When responding, please keep the subject line intact and reply to all email addresses included in the To and CC lines. (Feel free to cut this introductory paragraph, however.) Please refer to https://www.ietf.org/iesg/statement/discuss-criteria.html for more information about IESG DISCUSS and COMMENT positions. The document, along with other ballot positions, can be found here: https://datatracker.ietf.org/doc/draft-ietf-isis-mpls-elc/ ---------------------------------------------------------------------- COMMENT: ---------------------------------------------------------------------- Two editorial nits: ** Section 3. Editorial. s/ When a router propagates a prefix between ISIS levels ([RFC5302],/When a router propagates a prefix between ISIS levels [RFC5302],/ ** Section 4. Figure 2. The text says that “A MSD-Type Code 2 has been assigned by IANA”, but Figure 2 says “MSD-Type=TBD2”. From nobody Tue May 19 15:37:30 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id A4C503A11C9 for ; Tue, 19 May 2020 15:37:28 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.087 X-Spam-Level: X-Spam-Status: No, score=-2.087 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_REMOTE_IMAGE=0.01, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Pm0VZ4LBIA8D for ; Tue, 19 May 2020 15:37:26 -0700 (PDT) Received: from mail-il1-x12d.google.com (mail-il1-x12d.google.com [IPv6:2607:f8b0:4864:20::12d]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 692753A11C3 for ; Tue, 19 May 2020 15:37:26 -0700 (PDT) Received: by mail-il1-x12d.google.com with SMTP id j3so1079145ilk.11 for ; Tue, 19 May 2020 15:37:26 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=RFTtsYir5yoL1UYWvUdvBwD/i2Y5DRnXL/q2BR7Uqfs=; b=BvwBW9n+A6DFxmkjQKUJmUS10nc/qmCX8ph2oW/nOSbL32GO+BchLkWreVV6e2s2vt 3dFejQ2twAHkQcnXq6Nb8xnh+D0Ig3MF9gbXCg5eFBAR4qT6nRNeYk5nM4+ofcYzQGgo /J2Ab2z1wnx04CSXgiOOdsaZa39NgzUmu1iTNhPIHgRNrt2bfM2vkHx339bDwP9bIhw8 ZJIANID0RNHBCYxGqCaQLpO8jtaj81geU1zz7eRLN+bjnFQ/7rxxALbkMu2n6qvQE03J K2KCicx8WxjrwzYwuRrbxhbg35wi60ROs29bcqD7TDpfSMyC75ZGRFhXxtWmg35AiunU eavw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=RFTtsYir5yoL1UYWvUdvBwD/i2Y5DRnXL/q2BR7Uqfs=; b=fOv/ym+ofqBzOx6B2DvExFePec5TEkLLF/Giis/j2NOHfPMSktwyZBhd29zadlfFol U6lJcS3s5E99/6hdIVSWVJALZZQa9m2FzfxUdSfZ52lVdo4QtsXZZlMaZag9LI8OpRqz oG6lLqllqxwBUHB/UhW5I1RdHnUJhdUaBdam2zZd2ZXhhXiOQbAHnQsTLkRbIwvNrmFL WJujqOZKeG6JbiiAG8o+oSY5UXuClurDE+Bij+AYU9dvkJG2/BMHPd//nvpNr9HMPiBs c8P5ivQkqfRDZx8XDcsO3434kqWrsKntpJVRaitWMIIxIyz10PMqbpyq8jx7R3SHysrE 2LUA== X-Gm-Message-State: AOAM531GZ8SsOfUsj64/ty97EHgyW3+9q6iWKdfQzJUisWVASF4VrCBg qs1IJ472aUMH5ME+pt5VPEUiiP90XFus7UGWa9g= X-Google-Smtp-Source: ABdhPJx5F+kZLguorQEIvucyuXgPCHS9kYN9Y1OmY/IGSKJyWRlzyboEjPOp9a0/7h70QiNx1YmmefAYKmZGRGDGGUM= X-Received: by 2002:a05:6e02:e8c:: with SMTP id t12mr1341754ilj.186.1589927845470; Tue, 19 May 2020 15:37:25 -0700 (PDT) MIME-Version: 1.0 References: <28938a998b384038b6dd513db00072cf@nokia-sbell.com> <48FED425-3613-42BD-9892-4CD6786EF1BB@gmail.com> <17654e27-0efa-bcff-67ba-01541ebc350d@cisco.com> In-Reply-To: <17654e27-0efa-bcff-67ba-01541ebc350d@cisco.com> From: Gyan Mishra Date: Tue, 19 May 2020 18:37:14 -0400 Message-ID: To: Peter Psenak Cc: Jeff Tantsura , "Ketan Talaulikar (ketant)" , "Wang, Weibin (NSB - CN/Shanghai)" , "lsr@ietf.org" Content-Type: multipart/alternative; boundary="00000000000072a66105a607ecd8" Archived-At: Subject: Re: [Lsr] draft-ietf-lsr-flex-algo X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 19 May 2020 22:37:29 -0000 --00000000000072a66105a607ecd8 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Tue, May 19, 2020 at 3:38 AM Peter Psenak wrote: > Gyan, > > On 19/05/2020 03:52, Gyan Mishra wrote: > > > > Flex algo is usually mentioned in the context of SR-TE to help reduced > > SRH size to circumvent MSD issues for both SRV6 and SR-MPLS, > > though segment list reduction may be seen as one of the benefits of the > flex-algo, it is certainly not the primary motivation behind it. The > primary motivation of flex-algo is to provide dynamic any to any > constrained based routing. > > > however can > > the 0-127 flex algo extensions since it=E2=80=99s an IGP extension used= in any > > pure IP network independent of SR flavors SR-MPLS or SRv6. > > SR/SRv6 is used as a dataplane. Any data plane can be used, if it > provides a way to route an algo specific traffic. > Gyan> Please clarify. I would think that since the flex algo capability is part of the IGP independent of the data plane is what you are saying, so any data plane can use the feature. So you are saying even if it can that their maybe a data plane specific algo awareness to be able to use or route the algo specific traffic. So for example can native IPv4 or IPv6 date plane can it without any specific algo awareness can it utilitize flex algo constraint based steering. Also others mentioned is their special hooks or programming required to make it work with RSVP-TE or PPR. > > > > > Also can flex algo be used in conjunction with RSVP-TE or PPR(preferred > > path routing). > > same answer as above. > > thanks, > Peter > > > > > Kind regards > > > > Gyan > > > > On Sat, May 9, 2020 at 9:25 PM Wang, Weibin (NSB - CN/Shanghai) > > > > wrote: > > > > Jeff, I see what you said, thank you for sharing information;____ > > > > __ __ > > > > __ __ > > > > __ __ > > > > Cheers! > > > > ____ > > > > __ __ > > > > Wang Weibin____ > > > > __ __ > > > > *From:* Jeff Tantsura > > > > *Sent:* 2020=E5=B9=B45=E6=9C=8810=E6=97=A5 3:24 > > *To:* Wang, Weibin (NSB - CN/Shanghai) > > > > *Cc:* Ketan Talaulikar (ketant) > >; lsr@ietf.org > > *Subject:* Re: [Lsr] draft-ietf-lsr-flex-algo____ > > > > __ __ > > > > Weibin,____ > > > > __ __ > > > > One could have an algo with MSD/ERLD as optimizations constrains, > > would be quite similar to colored links. Note - ERLD has implemente= d > > node capabilities only, so all links on a node will have to be > > pruned.____ > > > > The tradeoffs are - having centralized controller with global view > > computing a path that meets the constraints(classical BGP-LS + PCEP > > scenario) vs building a dynamic topology of connected nodes that > > meet a set of constrains, in first case, change in > > topology/capabilities would cause path recalculation/reoptimization > > on the PCE while in the second - IGP would recompute the topology > > locally.____ > > > > __ __ > > > > Regards,____ > > > > Jeff____ > > > > > > > > ____ > > > > On May 9, 2020, at 01:27, Wang, Weibin (NSB - CN/Shanghai) > > > > wrote:____ > > > > ____ > > > > Ketan, thank you for clarification.____ > > > > ____ > > > > ____ > > > > ____ > > > > Cheers!____ > > > > ____ > > > > Wang Weibin____ > > > > ____ > > > > *From:* Ketan Talaulikar (ketant) > > > > *Sent:* 2020=E5=B9=B45=E6=9C=889=E6=97=A5 14:52 > > *To:* Wang, Weibin (NSB - CN/Shanghai) > > > >; lsr@ietf.org > > > > *Subject:* RE: draft-ietf-lsr-flex-algo____ > > > > ____ > > > > Hi Wang,____ > > > > ____ > > > > You are correct. Though I wouldn=E2=80=99t call it a goal but r= ather a > > benefit/advantage =E2=80=93 same applies to SR-MPLS where the l= abel > > stack can be reduced.____ > > > > ____ > > > > Thanks,____ > > > > Ketan____ > > > > ____ > > > > *From:* Lsr = > > > *On Behalf Of *Wang, Weibin (NSB - CN/Shanghai) > > *Sent:* 08 May 2020 19:07 > > *To:* lsr@ietf.org > > *Subject:* [Lsr] draft-ietf-lsr-flex-algo____ > > > > ____ > > > > Hi authors:____ > > > > ____ > > > > After reading through this draft lsr-flex-algo, I want to know > > whether there is a potential goal of this draft to reduce the > > SRH size with enabling flex-algo with admin group in SRv6 > > deployment, because without flex-algo we have to have a big SRH > > size when the SRH include more SRv6 SIDs, if we enable flex-alg= o > > under special topology and link constraint condition, in theory > > we can even construct a end to end SR path/tunnel without SRH, > > but it still meet TE requirement. So my question is whether the > > flex-algo can be used as tool to reduce SRH size?____ > > > > ____ > > > > ____ > > > > ____ > > > > /Cheers !/____ > > > > **____ > > > > *WANG Weibin*____ > > > > _______________________________________________ > > Lsr mailing list > > Lsr@ietf.org > > https://www.ietf.org/mailman/listinfo/lsr____ > > > > _______________________________________________ > > Lsr mailing list > > Lsr@ietf.org > > https://www.ietf.org/mailman/listinfo/lsr > > > > -- > > > > Gyan Mishra > > > > Network Engineering & Technology > > > > Verizon > > > > Silver Spring, MD 20904 > > > > Phone: 301 502-1347 > > > > Email: gyan.s.mishra@verizon.com > > > > > > > > -- *Gyan Mishra* *Network Solutions A**rchitect * *M 301 502-134713101 Columbia Pike *Silver Spring, MD --00000000000072a66105a607ecd8 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable


On Tue, M= ay 19, 2020 at 3:38 AM Peter Psenak <ppsenak@cisco.com> wrote:
= Gyan,

On 19/05/2020 03:52, Gyan Mishra wrote:
>
> Flex algo is usually mentioned in the context of SR-TE to help reduced=
> SRH size to circumvent MSD issues for both SRV6 and SR-MPLS,

though segment list reduction may be seen as one of the benefits of the flex-algo, it is certainly not the primary motivation behind it. The
primary motivation of flex-algo is to provide dynamic any to any
constrained based routing.

> however can
> the 0-127 flex algo extensions since it=E2=80=99s an IGP extension use= d in any
> pure IP network independent of SR flavors SR-MPLS or SRv6.

SR/SRv6 is used as a dataplane. Any data plane can be used, if it
provides a way to route an algo specific traffic.

=C2=A0 =C2=A0 Gy= an> Please clarify.=C2=A0 I would think that since the flex algo capabil= ity is part of the IGP independent of the data plane is what you are saying= , so any data plane can use the feature.=C2=A0

<= /div>
So you are saying even if it can that their maybe a = data plane specific algo awareness to be able to use or route the algo spec= ific traffic.=C2=A0 So for example can native IPv4 or IPv6 date plane can i= t without any specific algo awareness can it utilitize flex algo constraint= based steering.=C2=A0 Also others mentioned is their special hooks or prog= ramming required to make it work with RSVP-TE or PPR.

>
> Also can flex algo be used in conjunction with RSVP-TE or PPR(preferre= d
> path routing).

same answer as above.

thanks,
Peter

>
> Kind regards
>
> Gyan
>
> On Sat, May 9, 2020 at 9:25 PM Wang, Weibin (NSB - CN/Shanghai)
> <w= eibin.wang@nokia-sbell.com <mailto:weibin.wang@nokia-sbell.com>> wro= te:
>
>=C2=A0 =C2=A0 =C2=A0Jeff, I see what you said, thank you for sharing in= formation;____
>
>=C2=A0 =C2=A0 =C2=A0__ __
>
>=C2=A0 =C2=A0 =C2=A0__ __
>
>=C2=A0 =C2=A0 =C2=A0__ __
>
>=C2=A0 =C2=A0 =C2=A0Cheers!
>
>=C2=A0 =C2=A0 =C2=A0____
>
>=C2=A0 =C2=A0 =C2=A0__ __
>
>=C2=A0 =C2=A0 =C2=A0Wang Weibin____
>
>=C2=A0 =C2=A0 =C2=A0__ __
>
>=C2=A0 =C2=A0 =C2=A0*From:* Jeff Tantsura <jefftant.ietf@gmail.com
>=C2=A0 =C2=A0 =C2=A0<mailto:jefftant.ietf@gmail.com>>
>=C2=A0 =C2=A0 =C2=A0*Sent:* 2020=E5=B9=B45=E6=9C=8810=E6=97=A5 3:24
>=C2=A0 =C2=A0 =C2=A0*To:* Wang, Weibin (NSB - CN/Shanghai) <weibin.wang@nokia= -sbell.com
>=C2=A0 =C2=A0 =C2=A0<mailto:weibin.wang@nokia-sbell.com>>
>=C2=A0 =C2=A0 =C2=A0*Cc:* Ketan Talaulikar (ketant) <ketant@cisco.com
>=C2=A0 =C2=A0 =C2=A0<mailto:ketant@cisco.com>>; lsr@ietf.org <mailto:lsr@ietf.org>
>=C2=A0 =C2=A0 =C2=A0*Subject:* Re: [Lsr] draft-ietf-lsr-flex-algo____ >
>=C2=A0 =C2=A0 =C2=A0__ __
>
>=C2=A0 =C2=A0 =C2=A0Weibin,____
>
>=C2=A0 =C2=A0 =C2=A0__ __
>
>=C2=A0 =C2=A0 =C2=A0One could have an algo with MSD/ERLD as optimizatio= ns constrains,
>=C2=A0 =C2=A0 =C2=A0would be quite similar to colored links. Note - ERL= D has implemented
>=C2=A0 =C2=A0 =C2=A0node capabilities only, so all links on a node will= have to be
>=C2=A0 =C2=A0 =C2=A0pruned.____
>
>=C2=A0 =C2=A0 =C2=A0The tradeoffs are - having centralized controller w= ith global view
>=C2=A0 =C2=A0 =C2=A0computing a path that meets the constraints(classic= al BGP-LS + PCEP
>=C2=A0 =C2=A0 =C2=A0scenario) vs building a dynamic topology of connect= ed nodes that
>=C2=A0 =C2=A0 =C2=A0meet a set of constrains, in first case, change in<= br> >=C2=A0 =C2=A0 =C2=A0topology/capabilities would cause path recalculatio= n/reoptimization
>=C2=A0 =C2=A0 =C2=A0on the PCE while in the second - IGP would recomput= e the topology
>=C2=A0 =C2=A0 =C2=A0locally.____
>
>=C2=A0 =C2=A0 =C2=A0__ __
>
>=C2=A0 =C2=A0 =C2=A0Regards,____
>
>=C2=A0 =C2=A0 =C2=A0Jeff____
>
>
>
>=C2=A0 =C2=A0 =C2=A0____
>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0On May 9, 2020, at 01:27, Wang, Weibi= n (NSB - CN/Shanghai)
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0<weibin.wang@nokia-sbell.com
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0<mailto:weibin.wang@nokia-sbell.com>&= gt; wrote:____
>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0____
>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Ketan, thank you for clarification.__= __
>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0____
>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0____
>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0____
>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Cheers!____
>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0____
>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Wang Weibin____
>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0____
>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0*From:* Ketan Talaulikar (ketant) <= ;ketant@cisco.com=
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0<mailto:ketant@cisco.com>>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0*Sent:* 2020=E5=B9=B45=E6=9C=889=E6= =97=A5 14:52
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0*To:* Wang, Weibin (NSB - CN/Shanghai= )
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0<weibin.wang@nokia-sbell.com
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0<mailto:weibin.wang@nokia-sbell.com>&= gt;; lsr@ietf.org
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0<mailto:lsr@ietf.org>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0*Subject:* RE: draft-ietf-lsr-flex-al= go____
>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0____
>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Hi Wang,____
>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0____
>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0You are correct. Though I wouldn=E2= =80=99t call it a goal but rather a
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0benefit/advantage =E2=80=93 same appl= ies to SR-MPLS where the label
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0stack can be reduced.____
>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0____
>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Thanks,____
>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Ketan____
>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0____
>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0*From:* Lsr <lsr-bounces@ietf.org <mailto:lsr-bounces@ietf.or= g>>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0*On Behalf Of *Wang, Weibin (NSB - CN= /Shanghai)
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0*Sent:* 08 May 2020 19:07
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0*To:* lsr@ietf.org <mailto:lsr@ietf.org>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0*Subject:* [Lsr] draft-ietf-lsr-flex-= algo____
>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0____
>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Hi authors:____
>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0____
>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0After reading through this draft lsr-= flex-algo, I want to know
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0whether there is a potential goal of = this draft to reduce the
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0SRH size with enabling flex-algo with= admin group in SRv6
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0deployment, because without flex-algo= we have to have a big SRH
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0size when the SRH include more SRv6 S= IDs, if we enable flex-algo
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0under special topology and link const= raint condition, in theory
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0we can even construct =C2=A0a end to = end SR path/tunnel without SRH,
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0but it still meet TE requirement. So = my question is whether the
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0flex-algo can be used as tool to redu= ce SRH size?____
>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0____
>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0____
>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0____
>
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--00000000000072a66105a607ecd8-- From nobody Tue May 19 15:43:53 2020 Return-Path: X-Original-To: lsr@ietf.org Delivered-To: lsr@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id 79E9A3A0E09; Tue, 19 May 2020 15:43:50 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: Benjamin Kaduk via Datatracker To: "The IESG" Cc: draft-ietf-ospf-mpls-elc@ietf.org, lsr-chairs@ietf.org, lsr@ietf.org, Acee Lindem , aretana.ietf@gmail.com, acee@cisco.com X-Test-IDTracker: no X-IETF-IDTracker: 6.130.1 Auto-Submitted: auto-generated Precedence: bulk Reply-To: Benjamin Kaduk Message-ID: <158992822966.6522.4643872233017159559@ietfa.amsl.com> Date: Tue, 19 May 2020 15:43:50 -0700 Archived-At: Subject: [Lsr] Benjamin Kaduk's Discuss on draft-ietf-ospf-mpls-elc-13: (with DISCUSS and COMMENT) X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 19 May 2020 22:43:51 -0000 Benjamin Kaduk has entered the following ballot position for draft-ietf-ospf-mpls-elc-13: Discuss When responding, please keep the subject line intact and reply to all email addresses included in the To and CC lines. (Feel free to cut this introductory paragraph, however.) Please refer to https://www.ietf.org/iesg/statement/discuss-criteria.html for more information about IESG DISCUSS and COMMENT positions. The document, along with other ballot positions, can be found here: https://datatracker.ietf.org/doc/draft-ietf-ospf-mpls-elc/ ---------------------------------------------------------------------- DISCUSS: ---------------------------------------------------------------------- I have a question about the scope of some normative language, which may or may not be problematic but I'm too ignorant of OSPF details to be able to answer myself. In Section 3 we say that: When an OSPF Area Border Router (ABR) distributes information between connected areas it MUST preserve the ELC setting. My undesrtanding is that it's normal operation for an ABR to distribution information about prefixes and such between areas, and in particular that an ABR does not necessarily need to know the semantic details of every bit of information being distributed in that fashion. So, I am imagining a scenario where some routers in both areas advertise/understand the ELC flag but the ABR between them does not implement this spec. What would happen in such a scenario? If the ABR is still expected to distribute the ELC setting without change, isn't that just a core requirement from the respective OSPF specs, as opposed to a new requirement imposed by this spec (which, in this scenario, the ABR is not claiming to adhere to anyway)? There is perhaps a similar question about the ASBR guidance, though when doing cross-protocol signalling there is a more clear need for the ASBR to understand the semantics of the flags it is redistributing (and it's only a "SHOULD"). ---------------------------------------------------------------------- COMMENT: ---------------------------------------------------------------------- Section 1 The abstract is pretty explicit that "this draft defines" both ELC and ERLD signaling capabilities, but this section only has a clear statement for the ELC. Should we put something at the end of the last paragraph about "this document defines a mechanism to signal the ERLD using OSPFv2 and OSPFv3"? In cases where LSPs are used (e.g., SR-MPLS [RFC8660], it would be side note(?): I don't know that SR-MPLS is so popular so as to be privileged as the only example given for LSP usage. If we instead talked about using IGPs to signal labels, this selection would seem less surprising to me. Section 3 If the router supports ELs on all of its interfaces, it SHOULD advertise the ELC with every local host prefix it advertises in OSPF. Do we want to say anything about (not) advertising the ELC for other prefixes? Section 7 Should we say anything about considerations for redistributing ELC/ERLD information at the ASBR with respect to exposing "internal information" to external parties? This document specifies the ability to advertise additional node capabilities using OSPF and BGP-LS. As such, the security considerations as described in [RFC5340], [RFC7770], [RFC7752], [RFC7684], [RFC8476], [RFC8662], RFC 8662's security considerations have a pretty hard dependency on RFC 6790's security considerations; it might be worth mentioning 6790 directly in this list as well. [I-D.ietf-idr-bgp-ls-segment-routing-ext] and [I-D.ietf-idr-bgp-ls-segment-routing-msd] are applicable to this document. Could we also have a brief note that the (respective) OSPF security mechanisms serve to protect the ELC/ERLD information? Incorrectly setting the E flag during origination, propagation or redistribution may lead to black-holing of the traffic on the egress node. This is what happens when the E flag should not be set but is erroneously set. Should we also say what happens if we should set the E flag but erroneously clear it (e.g., that poor or no load-balancing may occur)? Section 8 I do see the note in the shepherd writeup about the sixth author (thank you!); if we're already breaking through the 5-author limit, did we consider making those who "should be considered as co-authors" listed as co-authors? Section 10.2 It's slightly surprising to see the core OSPF protocols only listed as informative, but I can see how they are to be considered "basic specifications" in the vein of https://www.ietf.org/about/groups/iesg/statements/normative-informative-references/ From nobody Tue May 19 15:44:46 2020 Return-Path: X-Original-To: lsr@ietf.org Delivered-To: lsr@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id 232183A0E09; Tue, 19 May 2020 15:44:41 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: Benjamin Kaduk via Datatracker To: "The IESG" Cc: draft-ietf-isis-mpls-elc@ietf.org, lsr-chairs@ietf.org, lsr@ietf.org, Acee Lindem , aretana.ietf@gmail.com, acee@cisco.com X-Test-IDTracker: no X-IETF-IDTracker: 6.130.1 Auto-Submitted: auto-generated Precedence: bulk Reply-To: Benjamin Kaduk Message-ID: <158992828112.6026.1646593855480055081@ietfa.amsl.com> Date: Tue, 19 May 2020 15:44:41 -0700 Archived-At: Subject: [Lsr] Benjamin Kaduk's Discuss on draft-ietf-isis-mpls-elc-12: (with DISCUSS and COMMENT) X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 19 May 2020 22:44:41 -0000 Benjamin Kaduk has entered the following ballot position for draft-ietf-isis-mpls-elc-12: Discuss When responding, please keep the subject line intact and reply to all email addresses included in the To and CC lines. (Feel free to cut this introductory paragraph, however.) Please refer to https://www.ietf.org/iesg/statement/discuss-criteria.html for more information about IESG DISCUSS and COMMENT positions. The document, along with other ballot positions, can be found here: https://datatracker.ietf.org/doc/draft-ietf-isis-mpls-elc/ ---------------------------------------------------------------------- DISCUSS: ---------------------------------------------------------------------- As for other reviewers, many of my comments duplicate those for the OSPF document; I expect that the analogous responses apply and am fine if they only appear for one document's review. Here, the question I have about normative language applies to the text in Section 3: When a router propagates a prefix between ISIS levels ([RFC5302], it MUST preserve the ELC signaling for this prefix. The scenario in question is analogous to the OSPF cross-area case: is the router propagating the prefix between ISIS levels required to implement this document; is preservation of the flag value a new requirement from this document vs. a preexisting property; and is this document trying to make normative requirements of devices that don't implement this document? Likewise, the ASBR case for cross-protocol redistribution seems to rather inherently require understanding the semantics of the flags being translated. ---------------------------------------------------------------------- COMMENT: ---------------------------------------------------------------------- Section 1 Should we add a sentence at the end of the last paragraph about how "this document defines a mechanism to signal the ERLD using IS-IS"? In cases where LSPs are used (e.g., SR-MPLS [RFC8660], it would be side note(?): I don't know that SR-MPLS is so popular so as to be privileged as the only example given for LSP usage. If we instead talked about using IGPs to signal labels, this selection would seem less surprising to me. Section 3 unless all of its interfaces are capable of processing ELs. If a router supports ELs on all of its interfaces, it SHOULD set the ELC for every local host prefix it advertises in IS-IS. Do we want to say anything about (not) advertising the ELC for other prefixes? Section 4 I agree with Roman's comment about code 2 vs TBD2. ERLD in the range between 0 to 255. The scope of the advertisement depends on the application. If a router has multiple interfaces with Just to check: w.r.t. "scope", both this document and the OSPF one only define usage of this MSD type at the scope of a single node, right? (I don't see a particular reason to preclude using it at a different scope.) Section 6 - Bit 3 in the Bit Values for Prefix Attribute Flags Sub-TLV registry has been assigned to the ELC Flag. IANA is asked to Is there an "IS-IS" in the name of this registry? Section 7 Should we say anything about considerations for redistributing ELC/ERLD information at the ASBR with respect to exposing "internal information" to external parties? This document specifies the ability to advertise additional node capabilities using IS-IS and BGP-LS. As such, the security considerations as described in [RFC7981], [RFC7752], [RFC7794], [RFC8491], [RFC8662], [I-D.ietf-idr-bgp-ls-segment-routing-ext] and RFC 8662's security considerations have a pretty hard dependency on RFC 6790's security considerations; it might be worth mentioning 6790 directly in this list as well. [I-D.ietf-idr-bgp-ls-segment-routing-msd] are applicable to this document. Could we also have a brief note that the normal IS-IS authentication mechanisms serve to protect the ELC/ERLD information? Incorrectly setting the E flag during origination, propagation or redistribution may lead to black-holing of the traffic on the egress node. This is what happens when the E flag should not be set but is erroneously set. Should we also say what happens if we should set the E flag but erroneously clear it (e.g., that poor or no load-balancing may occur)? Section 8 I do see the note in the shepherd writeup about the sixth author (thank you!); if we're already breaking through the 5-author limit, did we consider making those who "should be considered as co-authors" listed as co-authors? Section 10.1 Should we reference RFC 7981 from Section 4 as well? Right now we seem to only use it for the security considerations, which is not necessarily enough to qualify it as a normative reference. 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Wed, 20 May 2020 03:52:22 +0000 From: Huaimo Chen To: Gyan Mishra CC: "lsr@ietf.org" , "Acee Lindem (acee)" Thread-Topic: [Lsr] Flooding Topology Computation Algorithm - draft-cc-lsr-flooding-reduction-08 Working Group Adoption Call Thread-Index: AQHWKvCWbO+rNwui80Sty0q3wo/aI6iuQDRQgAC6fICAAVrmiA== Date: Wed, 20 May 2020 03:52:22 +0000 Message-ID: References: <63330FD6-EDE8-4938-AA85-948279C57E34@cisco.com> , In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: gmail.com; dkim=none (message not signed) header.d=none;gmail.com; dmarc=none action=none header.from=futurewei.com; x-originating-ip: [2601:199:4300:8e5a:9d9d:4d70:45ee:c375] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: 7236e09e-ead9-48b1-0eea-08d7fc7133e6 x-ms-traffictypediagnostic: MN2PR13MB3472: x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:9508; x-forefront-prvs: 04097B7F7F x-ms-exchange-senderadcheck: 1 x-microsoft-antispam: BCL:0; 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boundary="_000_MN2PR13MB3117C43CA052E4E29D7428CBF2B60MN2PR13MB3117namp_" MIME-Version: 1.0 X-OriginatorOrg: Futurewei.com X-MS-Exchange-CrossTenant-Network-Message-Id: 7236e09e-ead9-48b1-0eea-08d7fc7133e6 X-MS-Exchange-CrossTenant-originalarrivaltime: 20 May 2020 03:52:22.7004 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 0fee8ff2-a3b2-4018-9c75-3a1d5591fedc X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: jsx/bNb5YV6fsmoSD2XQfEjWXq+yNwc5Zzn+Pb5mYSMuDvJkg+AslFfucd+yb1ffQxz9TSnuNNENSeathIdIig== X-MS-Exchange-Transport-CrossTenantHeadersStamped: MN2PR13MB3472 Archived-At: Subject: Re: [Lsr] Flooding Topology Computation Algorithm - draft-cc-lsr-flooding-reduction-08 Working Group Adoption Call X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 20 May 2020 03:52:30 -0000 --_000_MN2PR13MB3117C43CA052E4E29D7428CBF2B60MN2PR13MB3117namp_ Content-Type: text/plain; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable Hi Gyan, Thank you very much for your questions and support. This Flooding Topology Computation algorithm can be used in the Dynamic= Flooding on Dense Graphs to compute the flooding topologies for the data c= enter clos dense meshed topologies with many ECMP paths. It can be used by = the area leader in the centralized mode to compute the flooding topology. Best Regards, Huaimo ________________________________ From: Lsr on behalf of Gyan Mishra Sent: Tuesday, May 19, 2020 2:39 AM To: Yanhe Fan Cc: lsr@ietf.org ; Acee Lindem (acee) Subject: Re: [Lsr] Flooding Topology Computation Algorithm - draft-cc-lsr-f= looding-reduction-08 Working Group Adoption Call I support WG adoption and have a few questions related to the draft. Does this flooding algorithm use the dynamic flooding algorithm used in dat= a center clos dense meshed topologies with many ECMP paths where the flood = is decoupled from the physical topology. In the dynamic flooding algorithm= mentioned in centralized mode the flooding is computed by the area leader = and distributed to all nodes. In distributed mode each mode the area leade= r determines the algorithm and then each node computes the flooding topolog= y based on the algorithm. This dynamic algorithm for optimized flood reduction would reduce the amoun= t of redundant flooding in highly densely meshed ospf or Isis topologies. = So this optimization of flooding would improving overall link state routing= protocol convergence. Gyan On Mon, May 18, 2020 at 3:37 PM Yanhe Fan > wrote: Support it as a co-author. Thanks, Yanhe From: Lsr > On Behalf Of = Acee Lindem (acee) Sent: Friday, May 15, 2020 3:40 PM To: lsr@ietf.org Subject: [Lsr] Flooding Topology Computation Algorithm - draft-cc-lsr-flood= ing-reduction-08 Working Group Adoption Call This begins a 3 week (due to holidays) WG adoption call for the =93Flooding= Topology Computation Algorithm=94 draft. Please issue your support or obje= ction to this list by 11:59 PM, UTC on June 5th, 2020. Here is a URL for yo= ur convenience. https://datatracker.ietf.org/doc/draft-cc-lsr-flooding-reduction/ Thanks, Acee _______________________________________________ Lsr mailing list Lsr@ietf.org https://www.ietf.org/mailman/listinfo/lsr -- [http://ss7.vzw.com/is/image/VerizonWireless/vz-logo-email] Gyan Mishra Network Solutions Architect M 301 502-1347 13101 Columbia Pike Silver Spring, MD --_000_MN2PR13MB3117C43CA052E4E29D7428CBF2B60MN2PR13MB3117namp_ Content-Type: text/html; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable
Hi Gyan,



    Thank you very much for your questions and support.

    This Flooding Topology Computation algorithm can be used in the Dynamic Flooding on Dense Graphs to compute the flooding topologies for the d= ata center clos dense meshed topologies with many ECMP paths. It can be use= d by the area leader in the centralized mode to compute the flooding topolo= gy.   

Best Regards,
Huaimo
From: Lsr <lsr-bounces@i= etf.org> on behalf of Gyan Mishra <hayabusagsm@gmail.com>
Sent: Tuesday, May 19, 2020 2:39 AM
To: Yanhe Fan <yfan@casa-systems.com>
Cc: lsr@ietf.org <lsr@ietf.org>; Acee Lindem (acee) <acee= =3D40cisco.com@dmarc.ietf.org>
Subject: Re: [Lsr] Flooding Topology Computation Algorithm - draft-c= c-lsr-flooding-reduction-08 Working Group Adoption Call
 

I support WG adoption and have a few questions related to= the draft.

Does this flooding algorithm use the dynamic flooding alg= orithm used in data center clos dense meshed topologies with many ECMP path= s where the flood is decoupled from the physical topology.  In the dyn= amic flooding algorithm mentioned in centralized mode the flooding is computed by the area leader and distributed to all no= des.  In distributed mode each mode the area leader determines the alg= orithm and then each node computes the flooding topology based on the algor= ithm.  

This dynamic algorithm for optimized flood reduction woul= d reduce the amount of redundant flooding in highly densely meshed ospf or = Isis topologies.  So this optimization of flooding would improving ove= rall link state routing protocol convergence.

Gyan 

On Mon, May 18, 2020 at 3:37 PM Yan= he Fan <yfan@casa-systems.com> wrote:

Support it as a co-= author.

 

Thanks,

Yanhe=

_______________________________________________
Lsr mailing list
Lsr@ietf.org
https://www.ietf.org/mailman/listinfo/lsr=
--


Gyan Mishra

Network Solutio= ns Architect&= nbsp;

M 301 502-1347
13101 Columbia Pike 
Silver Spring, MD


--_000_MN2PR13MB3117C43CA052E4E29D7428CBF2B60MN2PR13MB3117namp_-- From nobody Wed May 20 01:16:28 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id B60093A128C for ; Wed, 20 May 2020 01:16:24 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -9.601 X-Spam-Level: X-Spam-Status: No, score=-9.601 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIMWL_WL_MED=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, SPF_PASS=-0.001, URIBL_BLOCKED=0.001, USER_IN_DEF_DKIM_WL=-7.5] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=cisco.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id sOq-u83hTKXu for ; Wed, 20 May 2020 01:16:22 -0700 (PDT) Received: from aer-iport-4.cisco.com (aer-iport-4.cisco.com [173.38.203.54]) (using TLSv1.2 with cipher DHE-RSA-SEED-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 7254E3A3B83 for ; Wed, 20 May 2020 01:16:03 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=9522; q=dns/txt; s=iport; t=1589962563; x=1591172163; h=subject:to:cc:references:from:message-id:date: mime-version:in-reply-to:content-transfer-encoding; bh=LDEi67JVoDXBwIgLJiddvtXTEIxOqQyGpoKR1AngGPw=; b=cNZAmB7zScF5W0Bh1MkXp3S7vebCd99NfeNGVK4F4GwM/yPYwOvFtdwM 5dGCdffpaSlVwSLTwwRFLpfFBdeLcnZhrUcUkS+0/kKU+sjmHZcvTkuKH 9dTcPBOLzk7/AirgdsoQVLyLFWn463MtaWrDR9XXddhp8jDmlsX7SDUmi c=; X-IronPort-AV: E=Sophos;i="5.73,413,1583193600"; d="scan'208";a="26310132" Received: from aer-iport-nat.cisco.com (HELO aer-core-3.cisco.com) ([173.38.203.22]) by aer-iport-4.cisco.com with ESMTP/TLS/DHE-RSA-SEED-SHA; 20 May 2020 08:16:01 +0000 Received: from [10.60.140.51] (ams-ppsenak-nitro2.cisco.com [10.60.140.51]) by aer-core-3.cisco.com (8.15.2/8.15.2) with ESMTP id 04K8G04r008644; Wed, 20 May 2020 08:16:01 GMT To: Gyan Mishra Cc: "Wang, Weibin (NSB - CN/Shanghai)" , "lsr@ietf.org" , Jeff Tantsura , "Ketan Talaulikar (ketant)" References: <28938a998b384038b6dd513db00072cf@nokia-sbell.com> <48FED425-3613-42BD-9892-4CD6786EF1BB@gmail.com> <17654e27-0efa-bcff-67ba-01541ebc350d@cisco.com> From: Peter Psenak Message-ID: Date: Wed, 20 May 2020 10:16:00 +0200 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:60.0) Gecko/20100101 Thunderbird/60.7.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit X-Outbound-SMTP-Client: 10.60.140.51, ams-ppsenak-nitro2.cisco.com X-Outbound-Node: aer-core-3.cisco.com Archived-At: Subject: Re: [Lsr] draft-ietf-lsr-flex-algo X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 20 May 2020 08:16:25 -0000 On 20/05/2020 00:37, Gyan Mishra wrote: > > > > On Tue, May 19, 2020 at 3:38 AM Peter Psenak > wrote: > > Gyan, > > On 19/05/2020 03:52, Gyan Mishra wrote: > > > > Flex algo is usually mentioned in the context of SR-TE to help > reduced > > SRH size to circumvent MSD issues for both SRV6 and SR-MPLS, > > though segment list reduction may be seen as one of the benefits of the > flex-algo, it is certainly not the primary motivation behind it. The > primary motivation of flex-algo is to provide dynamic any to any > constrained based routing. > > > however can > > the 0-127 flex algo extensions since it’s an IGP extension used > in any > > pure IP network independent of SR flavors SR-MPLS or SRv6. > > SR/SRv6 is used as a dataplane. Any data plane can be used, if it > provides a way to route an algo specific traffic. > > >     Gyan> Please clarify.  I would think that since the flex algo > capability is part of the IGP independent of the data plane is what you > are saying, so any data plane can use the feature. not really. You need to have a way to forward traffic for different algos over different paths. > > So you are saying even if it can that their maybe a data plane specific > algo awareness to be able to use or route the algo specific traffic.  So > for example can native IPv4 or IPv6 date plane can it without any > specific algo awareness can it utilitize flex algo constraint based > steering. if you have IP prefix P1 and you want to be able to send the traffic to it via 3 different paths via native IPv4 network how would you do that? > Also others mentioned is their special hooks or programming > required to make it work with RSVP-TE or PPR. > I let RSVP experts to find a way how to use the flex-algo paths. I'm sure there are ways to do so :) thanks, Peter > > > > > Also can flex algo be used in conjunction with RSVP-TE or > PPR(preferred > > path routing). > > same answer as above. > > thanks, > Peter > > > > > Kind regards > > > > Gyan > > > > On Sat, May 9, 2020 at 9:25 PM Wang, Weibin (NSB - CN/Shanghai) > > > >> wrote: > > > >     Jeff, I see what you said, thank you for sharing information;____ > > > >     __ __ > > > >     __ __ > > > >     __ __ > > > >     Cheers! > > > >     ____ > > > >     __ __ > > > >     Wang Weibin____ > > > >     __ __ > > > >     *From:* Jeff Tantsura > >      >> > >     *Sent:* 2020年5月10日 3:24 > >     *To:* Wang, Weibin (NSB - CN/Shanghai) > > >      >> > >     *Cc:* Ketan Talaulikar (ketant) > >     >>; > lsr@ietf.org > > >     *Subject:* Re: [Lsr] draft-ietf-lsr-flex-algo____ > > > >     __ __ > > > >     Weibin,____ > > > >     __ __ > > > >     One could have an algo with MSD/ERLD as optimizations constrains, > >     would be quite similar to colored links. Note - ERLD has > implemented > >     node capabilities only, so all links on a node will have to be > >     pruned.____ > > > >     The tradeoffs are - having centralized controller with global > view > >     computing a path that meets the constraints(classical BGP-LS > + PCEP > >     scenario) vs building a dynamic topology of connected nodes that > >     meet a set of constrains, in first case, change in > >     topology/capabilities would cause path > recalculation/reoptimization > >     on the PCE while in the second - IGP would recompute the topology > >     locally.____ > > > >     __ __ > > > >     Regards,____ > > > >     Jeff____ > > > > > > > >     ____ > > > >         On May 9, 2020, at 01:27, Wang, Weibin (NSB - CN/Shanghai) > >          > >          >> wrote:____ > > > >         ____ > > > >         Ketan, thank you for clarification.____ > > > >         ____ > > > >         ____ > > > >         ____ > > > >         Cheers!____ > > > >         ____ > > > >         Wang Weibin____ > > > >         ____ > > > >         *From:* Ketan Talaulikar (ketant) > >         >> > >         *Sent:* 2020年5月9日 14:52 > >         *To:* Wang, Weibin (NSB - CN/Shanghai) > >          > >          >>; lsr@ietf.org > > >         > > >         *Subject:* RE: draft-ietf-lsr-flex-algo____ > > > >         ____ > > > >         Hi Wang,____ > > > >         ____ > > > >         You are correct. Though I wouldn’t call it a goal but > rather a > >         benefit/advantage – same applies to SR-MPLS where the label > >         stack can be reduced.____ > > > >         ____ > > > >         Thanks,____ > > > >         Ketan____ > > > >         ____ > > > >         *From:* Lsr >> > >         *On Behalf Of *Wang, Weibin (NSB - CN/Shanghai) > >         *Sent:* 08 May 2020 19:07 > >         *To:* lsr@ietf.org > > > >         *Subject:* [Lsr] draft-ietf-lsr-flex-algo____ > > > >         ____ > > > >         Hi authors:____ > > > >         ____ > > > >         After reading through this draft lsr-flex-algo, I want to > know > >         whether there is a potential goal of this draft to reduce the > >         SRH size with enabling flex-algo with admin group in SRv6 > >         deployment, because without flex-algo we have to have a > big SRH > >         size when the SRH include more SRv6 SIDs, if we enable > flex-algo > >         under special topology and link constraint condition, in > theory > >         we can even construct  a end to end SR path/tunnel > without SRH, > >         but it still meet TE requirement. So my question is > whether the > >         flex-algo can be used as tool to reduce SRH size?____ > > > >         ____ > > > >         ____ > > > >         ____ > > > >         /Cheers !/____ > > > >         **____ > > > >         *WANG Weibin*____ > > > >         _______________________________________________ > >         Lsr mailing list > > Lsr@ietf.org > > > https://www.ietf.org/mailman/listinfo/lsr____ > > > >     _______________________________________________ > >     Lsr mailing list > > Lsr@ietf.org > > > https://www.ietf.org/mailman/listinfo/lsr > > > > -- > > > > Gyan  Mishra > > > > Network Engineering & Technology > > > > Verizon > > > > Silver Spring, MD 20904 > > > > Phone: 301 502-1347 > > > > Email: gyan.s.mishra@verizon.com > > > > > > > > > > -- > > > > *Gyan Mishra* > > /Network Solutions A//rchitect / > > /M 301 502-1347 > 13101 Columbia Pike > /Silver Spring, MD > > From nobody Wed May 20 01:39:03 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id E50FE3A3B6F; Wed, 20 May 2020 01:38:57 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -9.601 X-Spam-Level: X-Spam-Status: No, score=-9.601 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIMWL_WL_MED=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, SPF_PASS=-0.001, URIBL_BLOCKED=0.001, USER_IN_DEF_DKIM_WL=-7.5] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=cisco.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id becR74ncslyC; Wed, 20 May 2020 01:38:56 -0700 (PDT) Received: from aer-iport-3.cisco.com (aer-iport-3.cisco.com [173.38.203.53]) (using TLSv1.2 with cipher DHE-RSA-SEED-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 891853A3B6D; Wed, 20 May 2020 01:38:55 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=1375; q=dns/txt; s=iport; t=1589963936; x=1591173536; h=subject:to:cc:references:from:message-id:date: mime-version:in-reply-to:content-transfer-encoding; bh=9Nt/FHdMEcyd0XLmf2BmoxBbVm5vBPUqkqAvUQABgDA=; b=LpRJ01F6pHVnS11kDqpU0v39JHHF+LWei8jYilu6YLTG26C1FHQJcofS znXlzlLQbkTEnWrB01JrU0JrzybmSGxWZ7PXtZJocqiK4jAUwDsMre0DQ 5Rto0f1F1jfUaY4orRKPM0goBoBUdJV1exKGq7fZAIb3KF7icrZrqXeHf g=; X-IronPort-AV: E=Sophos;i="5.73,413,1583193600"; d="scan'208";a="24041028" Received: from aer-iport-nat.cisco.com (HELO aer-core-1.cisco.com) ([173.38.203.22]) by aer-iport-3.cisco.com with ESMTP/TLS/DHE-RSA-SEED-SHA; 20 May 2020 08:38:53 +0000 Received: from [10.60.140.51] (ams-ppsenak-nitro2.cisco.com [10.60.140.51]) by aer-core-1.cisco.com (8.15.2/8.15.2) with ESMTP id 04K8cqh3023033; Wed, 20 May 2020 08:38:53 GMT To: Roman Danyliw , The IESG Cc: draft-ietf-isis-mpls-elc@ietf.org, lsr-chairs@ietf.org, lsr@ietf.org, Acee Lindem , aretana.ietf@gmail.com References: <158992568960.13432.13347004307272975200@ietfa.amsl.com> From: Peter Psenak Message-ID: Date: Wed, 20 May 2020 10:38:52 +0200 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:60.0) Gecko/20100101 Thunderbird/60.7.0 MIME-Version: 1.0 In-Reply-To: <158992568960.13432.13347004307272975200@ietfa.amsl.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit X-Outbound-SMTP-Client: 10.60.140.51, ams-ppsenak-nitro2.cisco.com X-Outbound-Node: aer-core-1.cisco.com Archived-At: Subject: Re: [Lsr] Roman Danyliw's No Objection on draft-ietf-isis-mpls-elc-12: (with COMMENT) X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 20 May 2020 08:38:58 -0000 Hi Roman, On 20/05/2020 00:01, Roman Danyliw via Datatracker wrote: > Roman Danyliw has entered the following ballot position for > draft-ietf-isis-mpls-elc-12: No Objection > > When responding, please keep the subject line intact and reply to all > email addresses included in the To and CC lines. (Feel free to cut this > introductory paragraph, however.) > > > Please refer to https://www.ietf.org/iesg/statement/discuss-criteria.html > for more information about IESG DISCUSS and COMMENT positions. > > > The document, along with other ballot positions, can be found here: > https://datatracker.ietf.org/doc/draft-ietf-isis-mpls-elc/ > > > > ---------------------------------------------------------------------- > COMMENT: > ---------------------------------------------------------------------- > > Two editorial nits: > ** Section 3. Editorial. s/ When a router propagates a prefix between ISIS > levels ([RFC5302],/When a router propagates a prefix between ISIS levels > [RFC5302],/ I must be missing something, but what's the diff between the original and proposed text? > > ** Section 4. Figure 2. The text says that “A MSD-Type Code 2 has been > assigned by IANA”, but Figure 2 says “MSD-Type=TBD2”. the figure 2 has been removed based on the previous comments. thanks, Peter > > > > > From nobody Wed May 20 03:32:47 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 103BA3A07BA; Wed, 20 May 2020 03:32:45 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.096 X-Spam-Level: X-Spam-Status: No, score=-2.096 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, UNPARSEABLE_RELAY=0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 4XgFmvm0FvNp; Wed, 20 May 2020 03:32:43 -0700 (PDT) Received: from mail-wr1-x42c.google.com (mail-wr1-x42c.google.com [IPv6:2a00:1450:4864:20::42c]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id A54233A07AF; Wed, 20 May 2020 03:32:43 -0700 (PDT) Received: by mail-wr1-x42c.google.com with SMTP id l17so2603456wrr.4; Wed, 20 May 2020 03:32:43 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:in-reply-to:references:mime-version:date:message-id:subject:to :cc; bh=tqVojdobICDatFdrmRU+JZR5kZqCnzb6fyHjN69jtq4=; b=U9G6U5GN4lJtWbwhsaLzWya4kzE4jCAZkMBp1L/D2Uxpt1VhOv60FA4WdmUnF9Dr2Z XGjmF5Sk2XnCpfoUFnQaM2XDfluvNchxvImnyIalzQ0mDlLz57r1gD00OzzpseauIXlP EoJUUAQs0WufJR1GsJ+YlSUsZAqursFXsmTmk3qB27Qfbb1K/kFjJLbayJ26wxP9x54U Az43mgugvNsPz1CR15hDrNtk02GyVoRAGUk7J6HTSnu+Ow6X9VG6iD/RltTSrHkRd3t4 qUp6dlk32dMmXOY1h+gYEXAlKby/reqCb0Ww4MlvyHSY7PUTNYW0JPMhNsQM+DLy1EnC MULg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:in-reply-to:references:mime-version:date :message-id:subject:to:cc; bh=tqVojdobICDatFdrmRU+JZR5kZqCnzb6fyHjN69jtq4=; b=LNN7YBu8S951M6BDXf7875doHGltDU0e7PNL9SuZ+OA+ukWo1lIekuqQqc6PHEufS1 amRZdWIqvB3x3aZOdqXmtEfCF/CPfngbo++kMMSoOweBLlbe1VO5Nj3mQIrljgt+BnLh ep+JoqnNHDlLMExm8AGj9qeacaU2bTBVPYYywQEA3B2Urye6v/hOh1Q6MpmQkLp9tse7 VtfPdjihw1Bc/oX+9mmLRqUdp3rTDfXznuqEd95Y0wbfFoUISxDxr9FFU08Wb85x67Xb A4tYoj34/MyJe3D1CJXDlhXWac00ymtxEud9t6qryXt8VOgc84O2NpseM6/YYu7tGfZw 6UIg== X-Gm-Message-State: AOAM530Yzwl9Nga3eLT3K/Ltc0KMbfE1/IMDcLE4XmyNzHol/3/8hvID 3GPZNJJJOTuO4+eLMESuKLIvGweM+4t7Ui6+7w1mjznt X-Google-Smtp-Source: ABdhPJwrEEUAnS1MaSQdssbI8BgoJ/gSD0ByGOt+huKTEm6r7enu2mKCvk/HdxNy6A21QkXHSLmVFVrcQc+g96dsF4Y= X-Received: by 2002:a5d:5089:: with SMTP id a9mr3406175wrt.147.1589970761722; Wed, 20 May 2020 03:32:41 -0700 (PDT) Received: from 1058052472880 named unknown by gmailapi.google.com with HTTPREST; Wed, 20 May 2020 03:32:41 -0700 From: Alvaro Retana In-Reply-To: References: <158992568960.13432.13347004307272975200@ietfa.amsl.com> MIME-Version: 1.0 Date: Wed, 20 May 2020 03:32:41 -0700 Message-ID: To: The IESG , Peter Psenak , Roman Danyliw Cc: Acee Lindem , draft-ietf-isis-mpls-elc@ietf.org, lsr-chairs@ietf.org, lsr@ietf.org Content-Type: multipart/alternative; boundary="00000000000074b0a805a611eaaa" Archived-At: Subject: Re: [Lsr] Roman Danyliw's No Objection on draft-ietf-isis-mpls-elc-12: (with COMMENT) X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 20 May 2020 10:32:45 -0000 --00000000000074b0a805a611eaaa Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On May 20, 2020 at 4:38:54 AM, Peter Psenak (ppsenak@cisco.com) wrote: > Two editorial nits: > ** Section 3. Editorial. s/ When a router propagates a prefix between ISI= S > levels ([RFC5302],/When a router propagates a prefix between ISIS levels > [RFC5302],/ I must be missing something, but what's the diff between the original and proposed text? The =E2=80=9C(=E2=80=9C =E2=80=A6. I think others may have commented to add= =E2=80=9C)=E2=80=9D. Either way should work. Thanks! Alvaro. --00000000000074b0a805a611eaaa Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable =


On May 20= , 2020 at 4:38:54 AM, Peter Psenak (pp= senak@cisco.com) wrote:


> Two editorial nits:=C2=A0
> ** Section 3. Editorial. s/ When= a router propagates a prefix between ISIS=C2=A0
> levels ([RFC5302],/When a router propagates a pr= efix between ISIS levels=C2=A0=
> [RFC5302],/=C2=A0
=
I must be missing something, but what's the diff between the origin= al=C2=A0
and proposed text?= =C2=A0


The =E2=80=9C(=E2=80=9C =E2=80=A6. I think others may= have commented to add =E2=80=9C)=E2=80=9D.=C2=A0 Either way should work.


Thanks!


Alvaro.

--00000000000074b0a805a611eaaa-- From nobody Wed May 20 03:58:54 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id D3CA83A085C; Wed, 20 May 2020 03:58:52 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -9.601 X-Spam-Level: X-Spam-Status: No, score=-9.601 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIMWL_WL_MED=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, SPF_PASS=-0.001, URIBL_BLOCKED=0.001, USER_IN_DEF_DKIM_WL=-7.5] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=cisco.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 6N6lymMXuFJW; Wed, 20 May 2020 03:58:51 -0700 (PDT) Received: from aer-iport-3.cisco.com (aer-iport-3.cisco.com [173.38.203.53]) (using TLSv1.2 with cipher DHE-RSA-SEED-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id D66263A085A; Wed, 20 May 2020 03:58:50 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=680; q=dns/txt; s=iport; t=1589972331; x=1591181931; h=subject:to:cc:references:from:message-id:date: mime-version:in-reply-to:content-transfer-encoding; bh=AfJ8u5Fm6nVgxVjssurWPZvqqUAJBHxElx05q7k9ZAM=; b=ZSqWnrZG9zBf2BJ3f1OHYUWsQ/K5uNqZWAvYcd1KUYDYLJweMdnWizOg IjDKLBP3bhy1cCLGLaipa0GkJm4BsiievOE+9+C+0q7/vj4fbLRHAnV// 4UPc205wS52yjIAHgmxYc/kvVv05wwB6G1E2OcRH++jk/l+UMOWPcQCUO k=; X-IronPort-AV: E=Sophos;i="5.73,413,1583193600"; d="scan'208";a="24045302" Received: from aer-iport-nat.cisco.com (HELO aer-core-3.cisco.com) ([173.38.203.22]) by aer-iport-3.cisco.com with ESMTP/TLS/DHE-RSA-SEED-SHA; 20 May 2020 10:58:49 +0000 Received: from [10.60.140.51] (ams-ppsenak-nitro2.cisco.com [10.60.140.51]) by aer-core-3.cisco.com (8.15.2/8.15.2) with ESMTP id 04KAwmXa017811; Wed, 20 May 2020 10:58:48 GMT To: Alvaro Retana , The IESG , Roman Danyliw Cc: Acee Lindem , draft-ietf-isis-mpls-elc@ietf.org, lsr-chairs@ietf.org, lsr@ietf.org References: <158992568960.13432.13347004307272975200@ietfa.amsl.com> From: Peter Psenak Message-ID: <4c476a0a-d01d-6d71-451d-9e4af18d4c3c@cisco.com> Date: Wed, 20 May 2020 12:58:48 +0200 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:60.0) Gecko/20100101 Thunderbird/60.7.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit X-Outbound-SMTP-Client: 10.60.140.51, ams-ppsenak-nitro2.cisco.com X-Outbound-Node: aer-core-3.cisco.com Archived-At: Subject: Re: [Lsr] Roman Danyliw's No Objection on draft-ietf-isis-mpls-elc-12: (with COMMENT) X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 20 May 2020 10:58:53 -0000 On 20/05/2020 12:32, Alvaro Retana wrote: > > > On May 20, 2020 at 4:38:54 AM, Peter Psenak (ppsenak@cisco.com > ) wrote: > >> >> > Two editorial nits: >> > ** Section 3. Editorial. s/ When a router propagates a prefix between ISIS >> > levels ([RFC5302],/When a router propagates a prefix between ISIS levels >> > [RFC5302],/ >> >> I must be missing something, but what's the diff between the original >> and proposed text? > > > The “(“ …. I think others may have commented to add “)”.  Either way > should work. ah, yeah that has been fixed already :) thanks, Peter > > > Thanks! > > > Alvaro. > From nobody Wed May 20 05:36:21 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 601183A0943; Wed, 20 May 2020 05:36:15 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.099 X-Spam-Level: X-Spam-Status: No, score=-2.099 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=unavailable autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=cert.org Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id zJXOchZ8FgCk; 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Wed, 20 May 2020 08:36:06 -0400 Received: from MURIEL.ad.sei.cmu.edu (147.72.252.47) by CASCADE.ad.sei.cmu.edu (10.64.28.248) with Microsoft SMTP Server (TLS) id 14.3.487.0; Wed, 20 May 2020 08:36:06 -0400 Received: from MORRIS.ad.sei.cmu.edu (147.72.252.46) by MURIEL.ad.sei.cmu.edu (147.72.252.47) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.1847.3; Wed, 20 May 2020 08:36:06 -0400 Received: from MORRIS.ad.sei.cmu.edu ([fe80::555b:9498:552e:d1bb]) by MORRIS.ad.sei.cmu.edu ([fe80::555b:9498:552e:d1bb%22]) with mapi id 15.01.1847.007; Wed, 20 May 2020 08:36:06 -0400 From: Roman Danyliw To: Peter Psenak , The IESG CC: "lsr-chairs@ietf.org" , "draft-ietf-isis-mpls-elc@ietf.org" , "aretana.ietf@gmail.com" , Acee Lindem , "lsr@ietf.org" Thread-Topic: Roman Danyliw's No Objection on draft-ietf-isis-mpls-elc-12: (with COMMENT) Thread-Index: AQHWLikR6WedPEPm1EqkbpAbn5I0z6iw6ukA///+rJA= Date: Wed, 20 May 2020 12:36:05 +0000 Message-ID: References: <158992568960.13432.13347004307272975200@ietfa.amsl.com> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.64.202.68] Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 MIME-Version: 1.0 Archived-At: Subject: Re: [Lsr] Roman Danyliw's No Objection on draft-ietf-isis-mpls-elc-12: (with COMMENT) X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 20 May 2020 12:36:16 -0000 SGkgUGV0ZXIhDQoNCj4gLS0tLS1PcmlnaW5hbCBNZXNzYWdlLS0tLS0NCj4gRnJvbTogaWVzZyA8 aWVzZy1ib3VuY2VzQGlldGYub3JnPiBPbiBCZWhhbGYgT2YgUGV0ZXIgUHNlbmFrDQo+IFNlbnQ6 IFdlZG5lc2RheSwgTWF5IDIwLCAyMDIwIDQ6MzkgQU0NCj4gVG86IFJvbWFuIERhbnlsaXcgPHJk ZEBjZXJ0Lm9yZz47IFRoZSBJRVNHIDxpZXNnQGlldGYub3JnPg0KPiBDYzogbHNyLWNoYWlyc0Bp ZXRmLm9yZzsgZHJhZnQtaWV0Zi1pc2lzLW1wbHMtZWxjQGlldGYub3JnOw0KPiBhcmV0YW5hLmll dGZAZ21haWwuY29tOyBBY2VlIExpbmRlbSA8YWNlZUBjaXNjby5jb20+OyBsc3JAaWV0Zi5vcmcN Cj4gU3ViamVjdDogUmU6IFJvbWFuIERhbnlsaXcncyBObyBPYmplY3Rpb24gb24gZHJhZnQtaWV0 Zi1pc2lzLW1wbHMtZWxjLTEyOiAod2l0aA0KPiBDT01NRU5UKQ0KPiANCj4gSGkgUm9tYW4sDQo+ IA0KPiBPbiAyMC8wNS8yMDIwIDAwOjAxLCBSb21hbiBEYW55bGl3IHZpYSBEYXRhdHJhY2tlciB3 cm90ZToNCj4gPiBSb21hbiBEYW55bGl3IGhhcyBlbnRlcmVkIHRoZSBmb2xsb3dpbmcgYmFsbG90 IHBvc2l0aW9uIGZvcg0KPiA+IGRyYWZ0LWlldGYtaXNpcy1tcGxzLWVsYy0xMjogTm8gT2JqZWN0 aW9uDQo+ID4NCj4gPiBXaGVuIHJlc3BvbmRpbmcsIHBsZWFzZSBrZWVwIHRoZSBzdWJqZWN0IGxp bmUgaW50YWN0IGFuZCByZXBseSB0byBhbGwNCj4gPiBlbWFpbCBhZGRyZXNzZXMgaW5jbHVkZWQg aW4gdGhlIFRvIGFuZCBDQyBsaW5lcy4gKEZlZWwgZnJlZSB0byBjdXQNCj4gPiB0aGlzIGludHJv ZHVjdG9yeSBwYXJhZ3JhcGgsIGhvd2V2ZXIuKQ0KPiA+DQo+ID4NCj4gPiBQbGVhc2UgcmVmZXIg dG8NCj4gPiBodHRwczovL3d3dy5pZXRmLm9yZy9pZXNnL3N0YXRlbWVudC9kaXNjdXNzLWNyaXRl cmlhLmh0bWwNCj4gPiBmb3IgbW9yZSBpbmZvcm1hdGlvbiBhYm91dCBJRVNHIERJU0NVU1MgYW5k IENPTU1FTlQgcG9zaXRpb25zLg0KPiA+DQo+ID4NCj4gPiBUaGUgZG9jdW1lbnQsIGFsb25nIHdp dGggb3RoZXIgYmFsbG90IHBvc2l0aW9ucywgY2FuIGJlIGZvdW5kIGhlcmU6DQo+ID4gaHR0cHM6 Ly9kYXRhdHJhY2tlci5pZXRmLm9yZy9kb2MvZHJhZnQtaWV0Zi1pc2lzLW1wbHMtZWxjLw0KPiA+ DQo+ID4NCj4gPg0KPiA+IC0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0t LS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0NCj4gPiBDT01NRU5UOg0KPiA+IC0tLS0tLS0t LS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0t LS0tLS0NCj4gPg0KPiA+IFR3byBlZGl0b3JpYWwgbml0czoNCj4gPiAqKiBTZWN0aW9uIDMuICBF ZGl0b3JpYWwuICBzLyBXaGVuIGEgcm91dGVyIHByb3BhZ2F0ZXMgYSBwcmVmaXgNCj4gPiBiZXR3 ZWVuIElTSVMgbGV2ZWxzIChbUkZDNTMwMl0sL1doZW4gYSByb3V0ZXIgcHJvcGFnYXRlcyBhIHBy ZWZpeA0KPiA+IGJldHdlZW4gSVNJUyBsZXZlbHMgW1JGQzUzMDJdLC8NCg0KIihSRkNbNTMwMl0s IiAtLT4gIltSRkM1MzAyXSwiICBUaGVyZSB3YXMgYW4gZXh0cmEgb3BlbiAiKCIuDQoNCj4gSSBt dXN0IGJlIG1pc3Npbmcgc29tZXRoaW5nLCBidXQgd2hhdCdzIHRoZSBkaWZmIGJldHdlZW4gdGhl IG9yaWdpbmFsIGFuZA0KPiBwcm9wb3NlZCB0ZXh0Pw0KPiANCj4gPg0KPiA+ICoqIFNlY3Rpb24g NC4gIEZpZ3VyZSAyLiAgVGhlIHRleHQgc2F5cyB0aGF0IOKAnEEgTVNELVR5cGUgQ29kZSAyIGhh cw0KPiA+IGJlZW4gYXNzaWduZWQgYnkgSUFOQeKAnSwgYnV0IEZpZ3VyZSAyIHNheXMg4oCcTVNE LVR5cGU9VEJEMuKAnS4NCj4gDQo+IHRoZSBmaWd1cmUgMiBoYXMgYmVlbiByZW1vdmVkIGJhc2Vk IG9uIHRoZSBwcmV2aW91cyBjb21tZW50cy4NCg0KR3JlYXQhICBZb3UgYWxyZWFkeSBmaXhlZCBp dC4gIEkgd2FzIGJlaGluZCBvbiB0aGUgdXBkYXRlcy4NCg0KVGhhbmtzLA0KUm9tYW4NCg0KPiB0 aGFua3MsDQo+IFBldGVyDQo+ID4NCj4gPg0KPiA+DQo+ID4NCj4gPg0KDQo= From nobody Wed May 20 07:55:27 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 890053A0A64; 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Wed, 20 May 2020 07:55:21 -0700 (PDT) MIME-Version: 1.0 References: <47A153D9-E547-4C4D-A828-EB4410A44048@cisco.com> In-Reply-To: <47A153D9-E547-4C4D-A828-EB4410A44048@cisco.com> From: LEI LIU Date: Wed, 20 May 2020 07:56:17 -0700 Message-ID: To: "Acee Lindem (acee)" Cc: "draft-cc-lsr-flooding-reduction@ietf.org" , "lsr@ietf.org" Content-Type: multipart/alternative; boundary="000000000000cbfeee05a6159515" Archived-At: Subject: Re: [Lsr] Flooding Topology Computation Algorithm - draft-cc-lsr-flooding-reduction-08 IPR Poll X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 20 May 2020 14:55:24 -0000 --000000000000cbfeee05a6159515 Content-Type: text/plain; charset="UTF-8" Hi, Acee, I am not aware of any IPR that applies to draft-cc-lsr-flooding-reduction-08. Best Regards. Lei On Fri, May 15, 2020 at 12:47 PM Acee Lindem (acee) wrote: > Authors, > > > > Are you aware of any IPR that applies > to draft-cc-lsr-flooding-reduction-08.txt. > > > > If so, has this IPR been disclosed in compliance with IETF IPR rules > > (see RFCs 3979, 4879, 3669 and 5378 for more details). > > > > If you are listed as a document author or contributor please respond > > to this email regardless of whether or not you are aware of any > > relevant IPR. *The response needs to be sent to the LSR WG mailing > > list.* The document will not advance to the next stage until a > > response has been received from each author and contributor. > > > > If you are on the LSR WG email list but are not listed as an author or > > contributor, then please explicitly respond only if you are aware of > > any IPR that has not yet been disclosed in conformance with IETF rules. > > > > Thanks, > > Acee > --000000000000cbfeee05a6159515 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hi, Acee,

I am not aware of any IPR that applies t= o draft-cc-lsr-flooding-reduction-08.

Best Regards.
Lei

On Fri, May 15, 2020 at 12:47 PM Acee Lin= dem (acee) <acee@cisco.com> wro= te:

Authors,

=C2=A0<= /span>

Are you aware of any = IPR that applies to=C2=A0draft-cc-lsr-flooding-reduction-08.txt.<= /u>

=C2=A0<= /span>

If so, has this IPR b= een disclosed in compliance with IETF IPR rules=C2=A0<= /p>

(see RFCs 3979, 4879,= 3669 and 5378 for more details).

=C2=A0<= /span>

If you are listed as = a document author or contributor please respond

to this email regardl= ess of whether or not you are aware of any

relevant IPR. *The re= sponse needs to be sent to the LSR WG mailing

list.* The document w= ill not advance to the next stage until a

response has been rec= eived from each author and contributor.

=C2=A0<= /span>

If you are on the LSR= WG email list but are not listed as an author or

contributor, then ple= ase explicitly respond only if you are aware of

any IPR that has not = yet been disclosed in conformance with IETF rules.

=C2=A0<= /span>

Thanks,=

Acee

--000000000000cbfeee05a6159515-- From nobody Wed May 20 07:57:21 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 4FE003A0A85 for ; Wed, 20 May 2020 07:57:19 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.499 X-Spam-Level: X-Spam-Status: No, score=-1.499 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_FORGED_FROMDOMAIN=0.249, FREEMAIL_FROM=0.001, HEADER_FROM_DIFFERENT_DOMAINS=0.249, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=no autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=ieee.org Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 6c3uH6nMeF1W for ; Wed, 20 May 2020 07:57:18 -0700 (PDT) Received: from mail-oo1-xc36.google.com (mail-oo1-xc36.google.com [IPv6:2607:f8b0:4864:20::c36]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 040513A0A7E for ; Wed, 20 May 2020 07:57:17 -0700 (PDT) Received: by mail-oo1-xc36.google.com with SMTP id r12so783277ool.4 for ; Wed, 20 May 2020 07:57:17 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ieee.org; s=google; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=vfhn8gvcpVZbbpYp9E8eMakpNxSwEgJWiCUVdPGEiDs=; b=AfD9bYFzHih/mLLvXmk4ykDZQquxEls/vEIZkT7LAWDKtKvCLDlwOiKo5YaQqHvr1I UGzKyuf9w5ZiKiAwrPPKB/L4lUamxqNRj0K78VEUxW61te0PeEetiBtpK1cJBoo59htr P6A0jhaLBkYfcbSDoHGRIR2O7iwcQxXbo1jCo= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=vfhn8gvcpVZbbpYp9E8eMakpNxSwEgJWiCUVdPGEiDs=; b=B5T9x3QQcbiM1Bj1XhW1X337JniaGQZSsP1fXOHuAzPKiy59SBDz5HPt3ugS4D5L9j f9Q25cAUlxmaAwXQW8j50yA+CCVizmUgoS99lzok/rTCidgVzir2LOnkCvnnoU/mIVeC /Nh9jnG3vFOJoqta3T0/SQeLfqXOD4YH5MjulwKV0ML/o3Xd22XCiPxwQu7XOgBmiW4z M+jN2g8A3n6s/iDLfRPTIb1tQC42FoWKXTNlepPRfoobkUrMUPZB3rn6Fmzpq2jjTZ/j 1OIyCKV7qLe1YxuSKxAja2Zdnz2Z2VxsSJrPWNBlODnpfMbm+AvgvTuv0BJj9pQPolOo MwQQ== X-Gm-Message-State: AOAM531vVTJmItAzQIiYu1LuQaMW70FX+WzoutT5TQrMupbXr0OF4bZZ bI40qYkfn0B/XOcoDG98dNSLKV4m+Dmee/3MK5M/2RQU9wg= X-Google-Smtp-Source: ABdhPJzQfxJ4u2gFFZytgSBXJP+Uhz9bYDjIkP9nBcDq7J4a+ShKgmQoCHvtgMCJVMhDpStEP2GZt4txwgOk6PHOTPw= X-Received: by 2002:a4a:e836:: with SMTP id d22mr3648785ood.54.1589986637143; Wed, 20 May 2020 07:57:17 -0700 (PDT) MIME-Version: 1.0 References: <63330FD6-EDE8-4938-AA85-948279C57E34@cisco.com> In-Reply-To: <63330FD6-EDE8-4938-AA85-948279C57E34@cisco.com> From: LEI LIU Date: Wed, 20 May 2020 07:58:13 -0700 Message-ID: To: "Acee Lindem (acee)" Cc: "lsr@ietf.org" Content-Type: multipart/alternative; boundary="000000000000b4656b05a6159cd7" Archived-At: Subject: Re: [Lsr] Flooding Topology Computation Algorithm - draft-cc-lsr-flooding-reduction-08 Working Group Adoption Call X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 20 May 2020 14:57:20 -0000 --000000000000b4656b05a6159cd7 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Support it as a co-author. Thanks, Best regards, Lei On Fri, May 15, 2020 at 12:40 PM Acee Lindem (acee) wrote: > This begins a 3 week (due to holidays) WG adoption call for the =E2=80=9C= Flooding > Topology Computation Algorithm=E2=80=9D draft. Please issue your support = or > objection to this list by 11:59 PM, UTC on June 5th, 2020. Here is a URL > for your convenience. > > > > https://datatracker.ietf.org/doc/draft-cc-lsr-flooding-reduction/ > > > > Thanks, > Acee > _______________________________________________ > Lsr mailing list > Lsr@ietf.org > https://www.ietf.org/mailman/listinfo/lsr > --000000000000b4656b05a6159cd7 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable

Support it as a co-author.

=C2=A0

<= p class=3D"MsoNormal">Thanks,

Best regards,=C2=A0


<= p class=3D"MsoNormal">Lei

On Fri, = May 15, 2020 at 12:40 PM Acee Lindem (acee) <acee=3D40cisco.com@dmarc.ietf.org> wrote:

This begins a 3 week = (due to holidays) WG adoption call for the =E2=80=9CFlooding Topology Compu= tation Algorithm=E2=80=9D draft. Please issue your support or objection to = this list by 11:59 PM, UTC on June 5th, 2020. Here is a URL for your convenience.

=C2=A0<= /span>

= https://datatracker.ietf.org/doc/draft-cc-lsr-flooding-reduction/

=C2=A0<= /span>

Thanks,
Acee

_______________________________________________
Lsr mailing list
Lsr@ietf.org
https://www.ietf.org/mailman/listinfo/lsr


--000000000000b4656b05a6159cd7-- From nobody Wed May 20 08:14:54 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 140C43A0AD4 for ; Wed, 20 May 2020 08:14:53 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.987 X-Spam-Level: X-Spam-Status: No, score=-1.987 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, HTTPS_HTTP_MISMATCH=0.1, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_REMOTE_IMAGE=0.01, URIBL_BLOCKED=0.001] autolearn=unavailable autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id YyYuBD2k_QMH for ; Wed, 20 May 2020 08:14:51 -0700 (PDT) Received: from mail-il1-x131.google.com (mail-il1-x131.google.com [IPv6:2607:f8b0:4864:20::131]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 1DF843A0AE5 for ; Wed, 20 May 2020 08:14:51 -0700 (PDT) Received: by mail-il1-x131.google.com with SMTP id 4so3489165ilg.1 for ; Wed, 20 May 2020 08:14:51 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=HIY9IHW0q3KmUweGBVCmjwoHGSmk/29z+NF4UWlTTd4=; b=Cf0bWI5BBviYjqgJTekBLqijtEBcA0R+JJeV77iGept144QE6EWwAw5Ki/Mtrvle/i EuMKWJ2mlJ9kgvRgMoLI7x35hRaWNmzHmSbs+giQo9kag9Vua/ISTETzmy/jm7Z3GNi0 9vFIRhJhLNM8WswTn0BndNhJVvqGqUHhvce48XL5VDOH+eX7JErH8ZNuOQBT9d3bFqU+ 9LFbd8GBxFarZdeszkBzaYtitFD00EgPTmdwfMk4ZBZjhMRihJoJFDTnAMxz6Itwr35I k/Sb5bpF/oBfY/GFZT0Vy8UTnAeqpo1AV7Pnw4NyqGoQZQaiqph7ZqBuIe8raEEYQ7TF ekPg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=HIY9IHW0q3KmUweGBVCmjwoHGSmk/29z+NF4UWlTTd4=; b=G9svTROEt8EQR+/+Pzgguo37Pi5AdOQ1fxfPCiOtIGzqZF6EiKPc1SfZNjIpGuHlhw OKXKTd5KuNfBNkSXHf5CZ47WQmj6dZZ2XVqfAfMpjaGXxtY4uE1RRygv5Yp+eTlM8z9w ik1On/FGHRq2DLLWwCCwHuyjnyIcQelVLF2CLDI9dJENETwv2I+VsTdGD9jCTElFzMQ2 XZ6WXqHjYV1sq7F4+IjEJV1x2HDIlqCkRYLRvGJpxOchjx5zlNU10ybEuyP8Ae7YRpNV Cdf06B7HUIVCiaszwTyK5CGru/lIQ9M488qI++69szfd9hQRDjlT4MK3OhxRXJnTHrxK /l4A== X-Gm-Message-State: AOAM530Yi9mahRrdTkwyZTpr5cyK0ddu3BAcvHRWlwI3+e4jXU5EU6Mv vQJSF+hHoGdUvoyI/I/cvD+m6STIHXYp2QCFnYE= X-Google-Smtp-Source: ABdhPJxqzGKnRjx78CKVJ4KTkgQDVrxYN1BitMeJnaFr73QSKRNSLjhXJwWawlZGRWNzW/dFWlWy9DuJv/9fKp2AvcU= X-Received: by 2002:a92:400e:: with SMTP id n14mr4432512ila.300.1589987690152; Wed, 20 May 2020 08:14:50 -0700 (PDT) MIME-Version: 1.0 References: <63330FD6-EDE8-4938-AA85-948279C57E34@cisco.com> In-Reply-To: From: Gyan Mishra Date: Wed, 20 May 2020 11:14:39 -0400 Message-ID: To: Huaimo Chen Cc: "Acee Lindem (acee)" , "lsr@ietf.org" Content-Type: multipart/alternative; boundary="000000000000780b6105a615db96" Archived-At: Subject: Re: [Lsr] Flooding Topology Computation Algorithm - draft-cc-lsr-flooding-reduction-08 Working Group Adoption Call X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 20 May 2020 15:14:53 -0000 --000000000000780b6105a615db96 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Huaimo This is a much needed feature that operators have been needing for densely meshed topologies that commonly exist in data centers to accommodate very high bandwidth E-W traffic. Below is link from Cisco which has introduced feature for dynamic flooding in clos high density ECMP data center topologies. Please look at the feature description and it does seem to be exactly the same as this draft. Please confirm. There maybe other vendors due to industry demand have to get the feature deployed before it reaches standards vendor consensus with the IETF. https://www.cisco.com/c/en/us/products/collateral/switches/nexus-9000-serie= s-switches/white-paper-c11-743015.html We are testing this feature and planning to deploy but wanted to ensure that this is the same as the draft on the standards track. Kind regards Gyan On Tue, May 19, 2020 at 11:52 PM Huaimo Chen wrote: > Hi Gyan, > > Thank you very much for your questions and support. > > This Flooding Topology Computation algorithm can be used in the Dynam= ic > Flooding on Dense Graphs to compute the flooding topologies for the data > center clos dense meshed topologies with many ECMP paths. It can be used = by > the area leader in the centralized mode to compute the flooding topology. > > Best Regards, > Huaimo > ------------------------------ > *From:* Lsr on behalf of Gyan Mishra < > hayabusagsm@gmail.com> > *Sent:* Tuesday, May 19, 2020 2:39 AM > *To:* Yanhe Fan > *Cc:* lsr@ietf.org ; Acee Lindem (acee) 40cisco.com@dmarc.ietf.org> > *Subject:* Re: [Lsr] Flooding Topology Computation Algorithm - > draft-cc-lsr-flooding-reduction-08 Working Group Adoption Call > > > I support WG adoption and have a few questions related to the draft. > > Does this flooding algorithm use the dynamic flooding algorithm used in > data center clos dense meshed topologies with many ECMP paths where the > flood is decoupled from the physical topology. In the dynamic flooding > algorithm mentioned in centralized mode the flooding is computed by the > area leader and distributed to all nodes. In distributed mode each mode > the area leader determines the algorithm and then each node computes the > flooding topology based on the algorithm. > > This dynamic algorithm for optimized flood reduction would reduce the > amount of redundant flooding in highly densely meshed ospf or Isis > topologies. So this optimization of flooding would improving overall lin= k > state routing protocol convergence. > > Gyan > > On Mon, May 18, 2020 at 3:37 PM Yanhe Fan wrote: > > Support it as a co-author. > > > > Thanks, > > Yanhe > > > > *From:* Lsr *On Behalf Of *Acee Lindem (acee) > *Sent:* Friday, May 15, 2020 3:40 PM > *To:* lsr@ietf.org > *Subject:* [Lsr] Flooding Topology Computation Algorithm - > draft-cc-lsr-flooding-reduction-08 Working Group Adoption Call > > > > This begins a 3 week (due to holidays) WG adoption call for the =E2=80=9C= Flooding > Topology Computation Algorithm=E2=80=9D draft. Please issue your support = or > objection to this list by 11:59 PM, UTC on June 5th, 2020. Here is a URL > for your convenience. > > > > https://datatracker.ietf.org/doc/draft-cc-lsr-flooding-reduction/ > > > > > Thanks, > Acee > _______________________________________________ > Lsr mailing list > Lsr@ietf.org > https://www.ietf.org/mailman/listinfo/lsr > > > -- > > > > > > > *Gyan Mishra* > > *Network Solutions A**rchitect * > > > > *M 301 502-1347 13101 Columbia Pike > > *Silver Spring, MD > > > -- *Gyan Mishra* *Network Solutions A**rchitect * *M 301 502-134713101 Columbia Pike *Silver Spring, MD --000000000000780b6105a615db96 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Huaimo=C2=A0

=
This is a much needed feature that operators have been ne= eding for densely meshed topologies that commonly exist in data centers to = accommodate very high bandwidth E-W traffic.

Below is link from Cisco which has introduced feature = for dynamic flooding in clos high density ECMP data center topologies.

Please look at the feature d= escription and it does seem to be exactly the same as this draft.=C2=A0 Ple= ase confirm.=C2=A0

There= maybe other vendors due to industry demand have to get the feature deploye= d before it reaches standards vendor consensus with the IETF.



We are te= sting this feature and planning to deploy but wanted to ensure that this is= the same as the draft on the standards track.

<= /div>
Kind regards=C2=A0

=
Gyan


<= div dir=3D"ltr" class=3D"gmail_attr">On Tue, May 19, 2020 at 11:52 PM Huaim= o Chen <huaimo.chen@futurew= ei.com> wrote:
Hi Gy= an,

=C2= =A0 =C2=A0 Thank you very much for your questions and support.

=C2= =A0 =C2=A0 This Flooding Topology Computation algorithm can be used in the Dynamic Flooding on Dense Graphs to compute the flooding topologies for the=C2=A0d= ata center clos dense meshed topologies with many ECMP paths. It can be use= d by the area leader in the centralized mode to compute the flooding topolo= gy. =C2=A0=C2=A0

Best = Regards,
Huaim= o
From: Lsr = <lsr-bounces@ietf.org> on behalf of Gyan = Mishra <hayabusagsm@gmail.com>
Sent: Tuesday, May 19, 2020= 2:39 AM
To: Yanhe Fan <yfan@casa-systems.com>
Cc: lsr@iet= f.org <lsr@ietf.org>; Acee Lindem (acee) <= acee=3D40cisco.com@dmarc.ietf.org>
Subject: Re: [Lsr] Flooding= Topology Computation Algorithm - draft-cc-lsr-flooding-reduction-08 Workin= g Group Adoption Call
=C2=A0

I support WG adoption and have a few questions related to= the draft.

Does this flooding algorithm use the dynamic flooding alg= orithm used in data center clos dense meshed topologies with many ECMP path= s where the flood is decoupled from the physical topology.=C2=A0 In the dyn= amic flooding algorithm mentioned in centralized mode the flooding is computed by the area leader and distributed to all no= des.=C2=A0 In distributed mode each mode the area leader determines the alg= orithm and then each node computes the flooding topology based on the algor= ithm. =C2=A0

This dynamic algorithm for optimized flood reduction woul= d reduce the amount of redundant flooding in highly densely meshed ospf or = Isis topologies.=C2=A0 So this optimization of flooding would improving ove= rall link state routing protocol convergence.

Gyan=C2=A0

On Mon, May 18, 2020 at 3:37 PM Yanhe Fan <yfan@casa-systems.com>= ; wrote:

Support it as a co-author.<= /span>

=C2=A0

Thanks,

Yanhe

_______________________________________________
Lsr mailing list
Lsr@ietf.org
https://www.ietf.org/mailman/listinfo/lsr
--


Gyan M= ishra

Network Solutions Architect=C2=A0

M 301 502-1347
13101 Columbia Pike=C2=A0
Silver Spring, MD<= /a>


--
--000000000000780b6105a615db96-- From nobody Wed May 20 08:44:33 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 270293A0AD5 for ; Wed, 20 May 2020 08:44:30 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.087 X-Spam-Level: X-Spam-Status: No, score=-2.087 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_REMOTE_IMAGE=0.01, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 6KRXv4eiA0b3 for ; Wed, 20 May 2020 08:44:27 -0700 (PDT) Received: from mail-il1-x12e.google.com (mail-il1-x12e.google.com [IPv6:2607:f8b0:4864:20::12e]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 81E403A0AB1 for ; Wed, 20 May 2020 08:44:27 -0700 (PDT) Received: by mail-il1-x12e.google.com with SMTP id b71so3549647ilg.8 for ; Wed, 20 May 2020 08:44:27 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=aixHHZobyfWIekceqTa2aqjEL8ojV2s9/Hgp1aq9VrQ=; b=Z6fuZfMTS/XG+8TjxYyFQZa6kCZjaznYcPxtw4hUfbg1em5mYUXfqQFlW+rZZWX2Y9 RwriAhvFUJrwEvObsAjs8AmmebdYDAyWWOmObWyTS/WqVbccRTWU5kKjizrvQFv8+DS3 tCbs3NuJ7xciTfuliIOibLdRrdNB3YPt6pyUTk23WTkgJVkQeqD58pW/mMFHEZ0kulUC WBBTklpTFOPpypk28D0EL0oNKD5RswEWQg/uXUZR7ZdmuJlm1qXk8NXOLdBxudceoPl7 +V3lVrsLmqtsCFBsUwLlUvCcT7IBs9ZcBD5RjKnBnqyQi/W/ZQidBEO29ohO7HBOS6ce uR4Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=aixHHZobyfWIekceqTa2aqjEL8ojV2s9/Hgp1aq9VrQ=; b=Jm2FRSvOfA7PsR6IenJNkj+Pw+9dqQu/NgSQBAxiHDhOjkgMUWiBru8WNR6qgcpXEv dzodciGHP6zf6qCojbgrKZPpEBpOp2KE3BVOyDl+UOWRSmTMnzkn620JDpzlBg1IyNEo RrRumrCCpOVd++vfX7no/SF6Bh7Sp8BPvOylBOVkQyyButwfJlHyWJ+g8mtH7/aa5iUT 4IURaKbti5OE/HbJEeHraRt5RZzD+hhrPHn2UDpAlZkpVdf4SMcTyPAUeVqPi+ez06I3 ueRSXj4WDkWpGemWveaz9AFp+DK5rtjBO29MKhBrM7NcG621dd27a6f2aBv9h3bo9Fin j9BQ== X-Gm-Message-State: AOAM533WXk8VS+vxMlelqzxO4HOPtUEsOyPQ5eolChkS7YvpW2esDvHy ITYTHyFSQtpKSMJ8wAW3uQUNlFZWhUnItUMh4ZQ= X-Google-Smtp-Source: ABdhPJwdmwyIo1uxlRjRwfCS1ihBUMuzJcyDhZr+QKRHFi1bDld46icPwPny3ZczElzeR4IVmJyO8eRT6/gjX0f1C0w= X-Received: by 2002:a92:400e:: with SMTP id n14mr4559613ila.300.1589989466695; Wed, 20 May 2020 08:44:26 -0700 (PDT) MIME-Version: 1.0 References: <28938a998b384038b6dd513db00072cf@nokia-sbell.com> <48FED425-3613-42BD-9892-4CD6786EF1BB@gmail.com> <17654e27-0efa-bcff-67ba-01541ebc350d@cisco.com> In-Reply-To: From: Gyan Mishra Date: Wed, 20 May 2020 11:44:16 -0400 Message-ID: To: Peter Psenak Cc: Jeff Tantsura , "Ketan Talaulikar (ketant)" , "Wang, Weibin (NSB - CN/Shanghai)" , "lsr@ietf.org" Content-Type: multipart/alternative; boundary="0000000000005befe605a61645ef" Archived-At: Subject: Re: [Lsr] draft-ietf-lsr-flex-algo X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 20 May 2020 15:44:31 -0000 --0000000000005befe605a61645ef Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Wed, May 20, 2020 at 4:16 AM Peter Psenak wrote: > On 20/05/2020 00:37, Gyan Mishra wrote: > > > > > > > > On Tue, May 19, 2020 at 3:38 AM Peter Psenak > > wrote: > > > > Gyan, > > > > On 19/05/2020 03:52, Gyan Mishra wrote: > > > > > > Flex algo is usually mentioned in the context of SR-TE to help > > reduced > > > SRH size to circumvent MSD issues for both SRV6 and SR-MPLS, > > > > though segment list reduction may be seen as one of the benefits of > the > > flex-algo, it is certainly not the primary motivation behind it. Th= e > > primary motivation of flex-algo is to provide dynamic any to any > > constrained based routing. > > > > > however can > > > the 0-127 flex algo extensions since it=E2=80=99s an IGP extensi= on used > > in any > > > pure IP network independent of SR flavors SR-MPLS or SRv6. > > > > SR/SRv6 is used as a dataplane. Any data plane can be used, if it > > provides a way to route an algo specific traffic. > > > > > > Gyan> Please clarify. I would think that since the flex algo > > capability is part of the IGP independent of the data plane is what you > > are saying, so any data plane can use the feature. > > not really. You need to have a way to forward traffic for different > algos over different paths. Gyan> That is what I was expecting. So the flex algo draft talks in the context of SR-MPLS and SRV6 as those are the two data planes currently supported. Any other data planes would require development of a specification to use flex algo, but more so an industry business need or gap that is being filled with the development. SRv6 has more ubiquitous use cases then SR-MPLS, so both together cover most every use case requiring steering. So then is their a need to steer with native IPV4 or IPV6. > > > > > > So you are saying even if it can that their maybe a data plane specific > > algo awareness to be able to use or route the algo specific traffic. S= o > > for example can native IPv4 or IPv6 date plane can it without any > > specific algo awareness can it utilitize flex algo constraint based > > steering. > > if you have IP prefix P1 and you want to be able to send the traffic to > it via 3 different paths via native IPv4 network how would you do that? > > > Also others mentioned is their special hooks or programming > > required to make it work with RSVP-TE or PPR. > > > > I let RSVP experts to find a way how to use the flex-algo paths. I'm > sure there are ways to do so :) > > thanks, > Peter > > > > > > > > > Also can flex algo be used in conjunction with RSVP-TE or > > PPR(preferred > > > path routing). > > > > same answer as above. > > > > thanks, > > Peter > > > > > > > > Kind regards > > > > > > Gyan > > > > > > On Sat, May 9, 2020 at 9:25 PM Wang, Weibin (NSB - CN/Shanghai) > > > > > > >> wrote: > > > > > > Jeff, I see what you said, thank you for sharing > information;____ > > > > > > __ __ > > > > > > __ __ > > > > > > __ __ > > > > > > Cheers! > > > > > > ____ > > > > > > __ __ > > > > > > Wang Weibin____ > > > > > > __ __ > > > > > > *From:* Jeff Tantsura > > > > > >> > > > *Sent:* 2020=E5=B9=B45=E6=9C=8810=E6=97=A5 3:24 > > > *To:* Wang, Weibin (NSB - CN/Shanghai) > > > > > > >> > > > *Cc:* Ketan Talaulikar (ketant) > > > > >>; > > lsr@ietf.org > > > > > *Subject:* Re: [Lsr] draft-ietf-lsr-flex-algo____ > > > > > > __ __ > > > > > > Weibin,____ > > > > > > __ __ > > > > > > One could have an algo with MSD/ERLD as optimizations > constrains, > > > would be quite similar to colored links. Note - ERLD has > > implemented > > > node capabilities only, so all links on a node will have to = be > > > pruned.____ > > > > > > The tradeoffs are - having centralized controller with globa= l > > view > > > computing a path that meets the constraints(classical BGP-LS > > + PCEP > > > scenario) vs building a dynamic topology of connected nodes > that > > > meet a set of constrains, in first case, change in > > > topology/capabilities would cause path > > recalculation/reoptimization > > > on the PCE while in the second - IGP would recompute the > topology > > > locally.____ > > > > > > __ __ > > > > > > Regards,____ > > > > > > Jeff____ > > > > > > > > > > > > ____ > > > > > > On May 9, 2020, at 01:27, Wang, Weibin (NSB - CN/Shangha= i) > > > > > > > > >> wrote:____ > > > > > > ____ > > > > > > Ketan, thank you for clarification.____ > > > > > > ____ > > > > > > ____ > > > > > > ____ > > > > > > Cheers!____ > > > > > > ____ > > > > > > Wang Weibin____ > > > > > > ____ > > > > > > *From:* Ketan Talaulikar (ketant) > > > > >> > > > *Sent:* 2020=E5=B9=B45=E6=9C=889=E6=97=A5 14:52 > > > *To:* Wang, Weibin (NSB - CN/Shanghai) > > > > > > > > >>; lsr@ietf.org > > > > > > > > > *Subject:* RE: draft-ietf-lsr-flex-algo____ > > > > > > ____ > > > > > > Hi Wang,____ > > > > > > ____ > > > > > > You are correct. Though I wouldn=E2=80=99t call it a goa= l but > > rather a > > > benefit/advantage =E2=80=93 same applies to SR-MPLS wher= e the > label > > > stack can be reduced.____ > > > > > > ____ > > > > > > Thanks,____ > > > > > > Ketan____ > > > > > > ____ > > > > > > *From:* Lsr > > >> > > > *On Behalf Of *Wang, Weibin (NSB - CN/Shanghai) > > > *Sent:* 08 May 2020 19:07 > > > *To:* lsr@ietf.org > > > > > > *Subject:* [Lsr] draft-ietf-lsr-flex-algo____ > > > > > > ____ > > > > > > Hi authors:____ > > > > > > ____ > > > > > > After reading through this draft lsr-flex-algo, I want t= o > > know > > > whether there is a potential goal of this draft to reduc= e > the > > > SRH size with enabling flex-algo with admin group in SRv= 6 > > > deployment, because without flex-algo we have to have a > > big SRH > > > size when the SRH include more SRv6 SIDs, if we enable > > flex-algo > > > under special topology and link constraint condition, in > > theory > > > we can even construct a end to end SR path/tunnel > > without SRH, > > > but it still meet TE requirement. So my question is > > whether the > > > flex-algo can be used as tool to reduce SRH size?____ > > > > > > ____ > > > > > > ____ > > > > > > ____ > > > > > > /Cheers !/____ > > > > > > **____ > > > > > > *WANG Weibin*____ > > > > > > _______________________________________________ > > > Lsr mailing list > > > Lsr@ietf.org > > > > > https://www.ietf.org/mailman/listinfo/lsr____ > > > > > > _______________________________________________ > > > Lsr mailing list > > > Lsr@ietf.org > > > > > https://www.ietf.org/mailman/listinfo/lsr > > > > > > -- > > > > > > Gyan Mishra > > > > > > Network Engineering & Technology > > > > > > Verizon > > > > > > Silver Spring, MD 20904 > > > > > > Phone: 301 502-1347 > > > > > > Email: gyan.s.mishra@verizon.com > > > > > > > > > > > > > > > > > -- > > > > > > > > *Gyan Mishra* > > > > /Network Solutions A//rchitect / > > > > /M 301 502-1347 > > 13101 Columbia Pike > > /Silver Spring, MD > > > > > > -- *Gyan Mishra* *Network Solutions A**rchitect * *M 301 502-134713101 Columbia Pike *Silver Spring, MD --0000000000005befe605a61645ef Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable


On Wed, May 20, 2020 at 4:16 AM Peter Psenak <ppsenak@cisco.com> wrote:
On 20/05/2020 00:37, Gyan Mishra wrote:
>
>
>
> On Tue, May 19, 2020 at 3:38 AM Peter Psenak <ppsenak@cisco.com
> <mailto:ppse= nak@cisco.com>> wrote:
>
>=C2=A0 =C2=A0 =C2=A0Gyan,
>
>=C2=A0 =C2=A0 =C2=A0On 19/05/2020 03:52, Gyan Mishra wrote:
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 > Flex algo is usually mentioned in the context= of SR-TE to help
>=C2=A0 =C2=A0 =C2=A0reduced
>=C2=A0 =C2=A0 =C2=A0 > SRH size to circumvent MSD issues for both SR= V6 and SR-MPLS,
>
>=C2=A0 =C2=A0 =C2=A0though segment list reduction may be seen as one of= the benefits of the
>=C2=A0 =C2=A0 =C2=A0flex-algo, it is certainly not the primary motivati= on behind it. The
>=C2=A0 =C2=A0 =C2=A0primary motivation of flex-algo is to provide dynam= ic any to any
>=C2=A0 =C2=A0 =C2=A0constrained based routing.
>
>=C2=A0 =C2=A0 =C2=A0 > however can
>=C2=A0 =C2=A0 =C2=A0 > the 0-127 flex algo extensions since it=E2=80= =99s an IGP extension used
>=C2=A0 =C2=A0 =C2=A0in any
>=C2=A0 =C2=A0 =C2=A0 > pure IP network independent of SR flavors SR-= MPLS or SRv6.
>
>=C2=A0 =C2=A0 =C2=A0SR/SRv6 is used as a dataplane. Any data plane can = be used, if it
>=C2=A0 =C2=A0 =C2=A0provides a way to route an algo specific traffic. >
>
>=C2=A0 =C2=A0 =C2=A0 Gyan> Please clarify.=C2=A0 I would think that = since the flex algo
> capability is part of the IGP independent of the data plane is what yo= u
> are saying, so any data plane can use the feature.

not really. You need to have a way to forward traffic for different
algos over different paths.

=C2=A0 =C2=A0Gyan> That is what I was expecting. So the flex = algo draft talks in the context of SR-MPLS and SRV6 as those are the two da= ta planes currently supported.=C2=A0 Any other data planes would require de= velopment of a specification to use flex algo, but more so an industry busi= ness need or gap that is being filled with the development.=C2=A0 SRv6 has = more ubiquitous use cases then SR-MPLS, so both together cover most every u= se case requiring steering.=C2=A0 So then is their a need to steer with nat= ive IPV4 or IPV6. =C2=A0


>
> So you are saying even if it can that their maybe a data plane specifi= c
> algo awareness to be able to use or route the algo specific traffic.= =C2=A0 So
> for example can native IPv4 or IPv6 date plane can it without any
> specific algo awareness can it utilitize flex algo constraint based > steering.=C2=A0

if you have IP prefix P1 and you want to be able to send the traffic to it via 3 different paths via native IPv4 network how would you do that?

> Also others mentioned is their special hooks or programming
> required to make it work with RSVP-TE or PPR.
>

I let RSVP experts to find a way how to use the flex-algo paths. I'm sure there are ways to do so :)

thanks,
Peter

>
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 > Also can flex algo be used in conjunction wit= h RSVP-TE or
>=C2=A0 =C2=A0 =C2=A0PPR(preferred
>=C2=A0 =C2=A0 =C2=A0 > path routing).
>
>=C2=A0 =C2=A0 =C2=A0same answer as above.
>
>=C2=A0 =C2=A0 =C2=A0thanks,
>=C2=A0 =C2=A0 =C2=A0Peter
>
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 > Kind regards
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 > Gyan
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 > On Sat, May 9, 2020 at 9:25 PM Wang, Weibin (= NSB - CN/Shanghai)
>=C2=A0 =C2=A0 =C2=A0 > <weibin.wang@nokia-sbell.com <mailto:weibin.wang@nokia= -sbell.com>
>=C2=A0 =C2=A0 =C2=A0<mailto:weibin.wang@nokia-sbell.com
>=C2=A0 =C2=A0 =C2=A0<mailto:weibin.wang@nokia-sbell.com>>> wrote:=
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0Jeff, I see what you said,= thank you for sharing information;____
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0__ __
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0__ __
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0__ __
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0Cheers!
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0____
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0__ __
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0Wang Weibin____
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0__ __
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0*From:* Jeff Tantsura <= jefftant.ietf@= gmail.com
>=C2=A0 =C2=A0 =C2=A0<mailto:jefftant.ietf@gmail.com>
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0<mailto:jefftant.ietf@gmail.com >=C2=A0 =C2=A0 =C2=A0<mailto:jefftant.ietf@gmail.com>>>
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0*Sent:* 2020=E5=B9=B45=E6= =9C=8810=E6=97=A5 3:24
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0*To:* Wang, Weibin (NSB - = CN/Shanghai)
>=C2=A0 =C2=A0 =C2=A0<weibin.wang@nokia-sbell.com <mailto:weibin.wang@nokia-sbell.= com>
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0<mailto:weibin.wang@nokia-sbell.c= om
>=C2=A0 =C2=A0 =C2=A0<mailto:weibin.wang@nokia-sbell.com>>>
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0*Cc:* Ketan Talaulikar (ke= tant) <ketant@cisc= o.com
>=C2=A0 =C2=A0 =C2=A0<mailto:ketant@cisco.com>
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0<mailto:ketant@cisco.com <mailto:ketant@cisco.com>&= gt;>;
>=C2=A0 =C2=A0 =C2=A0l= sr@ietf.org <mailto:lsr@ietf.org> <mailto:lsr@ietf.org
>=C2=A0 =C2=A0 =C2=A0<mailto:lsr@ietf.org>>
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0*Subject:* Re: [Lsr] draft= -ietf-lsr-flex-algo____
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0__ __
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0Weibin,____
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0__ __
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0One could have an algo wit= h MSD/ERLD as optimizations constrains,
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0would be quite similar to = colored links. Note - ERLD has
>=C2=A0 =C2=A0 =C2=A0implemented
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0node capabilities only, so= all links on a node will have to be
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0pruned.____
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0The tradeoffs are - having= centralized controller with global
>=C2=A0 =C2=A0 =C2=A0view
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0computing a path that meet= s the constraints(classical BGP-LS
>=C2=A0 =C2=A0 =C2=A0+ PCEP
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0scenario) vs building a dy= namic topology of connected nodes that
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0meet a set of constrains, = in first case, change in
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0topology/capabilities woul= d cause path
>=C2=A0 =C2=A0 =C2=A0recalculation/reoptimization
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0on the PCE while in the se= cond - IGP would recompute the topology
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0locally.____
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0__ __
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0Regards,____
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0Jeff____
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0____
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0On May 9, 20= 20, at 01:27, Wang, Weibin (NSB - CN/Shanghai)
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0<weibin.wang@nokia= -sbell.com
>=C2=A0 =C2=A0 =C2=A0<mailto:weibin.wang@nokia-sbell.com>
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0<mailto:<= a href=3D"mailto:weibin.wang@nokia-sbell.com" target=3D"_blank">weibin.wang= @nokia-sbell.com
>=C2=A0 =C2=A0 =C2=A0<mailto:weibin.wang@nokia-sbell.com>>> wrote:= ____
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0____
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Ketan, thank= you for clarification.____
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0____
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0____
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0____
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Cheers!____<= br> >=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0____
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Wang Weibin_= ___
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0____
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0*From:* Keta= n Talaulikar (ketant) <ketant@cisco.com
>=C2=A0 =C2=A0 =C2=A0<mailto:ketant@cisco.com>
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0<mailto:<= a href=3D"mailto:ketant@cisco.com" target=3D"_blank">ketant@cisco.com &= lt;mailto:ketant@cisc= o.com>>>
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0*Sent:* 2020= =E5=B9=B45=E6=9C=889=E6=97=A5 14:52
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0*To:* Wang, = Weibin (NSB - CN/Shanghai)
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0<weibin.wang@nokia= -sbell.com
>=C2=A0 =C2=A0 =C2=A0<mailto:weibin.wang@nokia-sbell.com>
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0<mailto:<= a href=3D"mailto:weibin.wang@nokia-sbell.com" target=3D"_blank">weibin.wang= @nokia-sbell.com
>=C2=A0 =C2=A0 =C2=A0<mailto:weibin.wang@nokia-sbell.com>>>; lsr@ietf.org
>=C2=A0 =C2=A0 =C2=A0<mailto:lsr@ietf.org>
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0<mailto:<= a href=3D"mailto:lsr@ietf.org" target=3D"_blank">lsr@ietf.org <mailt= o:lsr@ietf..org>><= br> >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0*Subject:* R= E: draft-ietf-lsr-flex-algo____
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0____
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Hi Wang,____=
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0____
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0You are corr= ect. Though I wouldn=E2=80=99t call it a goal but
>=C2=A0 =C2=A0 =C2=A0rather a
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0benefit/adva= ntage =E2=80=93 same applies to SR-MPLS where the label
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0stack can be= reduced.____
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0____
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Thanks,____<= br> >=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Ketan____ >=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0____
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0*From:* Lsr = <lsr-bounces@i= etf.org
>=C2=A0 =C2=A0 =C2=A0<mailto:lsr-bounces@ietf.org> <mailto:lsr-bounces@ietf.org
>=C2=A0 =C2=A0 =C2=A0<mailto:lsr-bounces@ietf.org>>>
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0*On Behalf O= f *Wang, Weibin (NSB - CN/Shanghai)
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0*Sent:* 08 M= ay 2020 19:07
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0*To:* lsr@ietf.org <mailto:lsr@ietf.org>
>=C2=A0 =C2=A0 =C2=A0<mailto:lsr@ietf.org <mailto:lsr@ietf.org>>
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0*Subject:* [= Lsr] draft-ietf-lsr-flex-algo____
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0____
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Hi authors:_= ___
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0____
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0After readin= g through this draft lsr-flex-algo, I want to
>=C2=A0 =C2=A0 =C2=A0know
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0whether ther= e is a potential goal of this draft to reduce the
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0SRH size wit= h enabling flex-algo with admin group in SRv6
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0deployment, = because without flex-algo we have to have a
>=C2=A0 =C2=A0 =C2=A0big SRH
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0size when th= e SRH include more SRv6 SIDs, if we enable
>=C2=A0 =C2=A0 =C2=A0flex-algo
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0under specia= l topology and link constraint condition, in
>=C2=A0 =C2=A0 =C2=A0theory
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0we can even = construct =C2=A0a end to end SR path/tunnel
>=C2=A0 =C2=A0 =C2=A0without SRH,
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0but it still= meet TE requirement. So my question is
>=C2=A0 =C2=A0 =C2=A0whether the
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0flex-algo ca= n be used as tool to reduce SRH size?____
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0____
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0____
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0____
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0/Cheers !/__= __
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0**____
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0*WANG Weibin= *____
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0____________= ___________________________________
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Lsr mailing = list
>=C2=A0 =C2=A0 =C2=A0 > Lsr@ietf.org <mailto:Lsr@ietf.org> <mailto:Lsr@ietf.org
>=C2=A0 =C2=A0 =C2=A0<mailto:Lsr@ietf.org>>
>=C2=A0 =C2=A0 =C2=A0 > https://www.ietf.org/mail= man/listinfo/lsr____
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0__________________________= _____________________
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0Lsr mailing list
>=C2=A0 =C2=A0 =C2=A0 > Lsr@ietf.org <mailto:Lsr@ietf.org> <mailto:Lsr@ietf.org
>=C2=A0 =C2=A0 =C2=A0<mailto:Lsr@ietf.org>>
>=C2=A0 =C2=A0 =C2=A0 > https://www.ietf.org/mailman/= listinfo/lsr
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 > --
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 > Gyan=C2=A0 Mishra
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 > Network Engineering & Technology
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 > Verizon
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 > Silver Spring, MD 20904
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 > Phone: 301 502-1347
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 > Email: gyan.s.mishra@verizon.com
>=C2=A0 =C2=A0 =C2=A0<mailto:gyan.s.mishra@verizon.com> <mailto:gyan.s.mishra@veriz= on.com
>=C2=A0 =C2=A0 =C2=A0<mailto:gyan.s.mishra@verizon.com>>
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >
>
> --
>
> <http://www.verizon.com/>
>
> *Gyan Mishra*
>
> /Network Solutions A//rchitect /
>
> /M 301 502-1347
> 13101 Columbia Pike
> /Silver Spring, MD
>
>

--
--0000000000005befe605a61645ef-- From nobody Wed May 20 08:48:43 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id CD2193A0A82 for ; Wed, 20 May 2020 08:48:38 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.5 X-Spam-Level: X-Spam-Status: No, score=-1.5 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FORGED_FROMDOMAIN=0.249, FREEMAIL_FROM=0.001, HEADER_FROM_DIFFERENT_DOMAINS=0.249, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001] autolearn=no autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 3pWWRd_L3kDM for ; Wed, 20 May 2020 08:48:37 -0700 (PDT) Received: from mail-pj1-x1035.google.com (mail-pj1-x1035.google.com [IPv6:2607:f8b0:4864:20::1035]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id C3E113A0A7D for ; Wed, 20 May 2020 08:48:35 -0700 (PDT) Received: by mail-pj1-x1035.google.com with SMTP id ci21so1478264pjb.3 for ; Wed, 20 May 2020 08:48:35 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=sender:from:message-id:mime-version:subject:date:in-reply-to:cc:to :references; bh=G6xI4vXJ1lXWv0b0xP95Z7eIx2KhKGdvWQujonTmRg8=; b=PUlKZGtRE3BVJyym87RHdPJPD0zc8pFWVQCjUx5vvSMIyF5cJ6UgJ2VZyJ3h+0HV17 ZTfIxBtyDHxNHnze+vjDuKX+KShDI04TYKAJd15rXArN5q1L2cXCLLS5bStXwYp8jw83 lQ20o+cWM7Kn/TTcqQrJlPaBCqYcwdNSGn2KyN752nS27hatJCnONMFRhnifv8xahvaR YQczqoi+cmnP/soVQWJB5UW7AyBcrsFVKzVcZL9PwnxnUKJDKcBzk7TpH07KeI7MqlJY gjYGyVvXzWCUA2ESVHLkepxg9gByFjnI1dCg2KjfJwoHqTft6NLVUgU9WLeY9V+w/PCN OcnQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:from:message-id:mime-version:subject:date :in-reply-to:cc:to:references; bh=G6xI4vXJ1lXWv0b0xP95Z7eIx2KhKGdvWQujonTmRg8=; b=DA/CvDIXGufKPrZLyibKM/zctsgzKOJThjmQgh7R7DmEl7tMQfYtHl+7phgcG7LYcC /gOErqZth7IfOI5zRWpX227nCqZN86t32f3kQnfy9GOxtUbg1ye/0b+q8U0i21EDYEvL HkHMGvui0alUXU5AJvg6i4GO04MPor3DR0lNO+iML0qeC0ti39eR7ghIEwYoCiZ+BMGU 5Jn1ep/mY+Mvoh4geBTXeK/mLbGar0ynC2wayAzMx8BKkrhwxBtl/7h1Eq7Hy9jpvkjz mvhrE0ifrS92aEont9fheo+wiOYVWmCv6PMsNpcb4gCqeONihtv0stvQxxo3hBsFalYg A9sw== X-Gm-Message-State: AOAM530ip3pAXPCVcLBju5A7iH/1F2z39W6Fite6ExcRuYHcaZ8QLJdN SjSifmoz7GoHzQia8RTy8aI= X-Google-Smtp-Source: ABdhPJyFrX8HTFQnWJyVDgScUwKCr2UAiGJTevSjHaqbO+HyKVXFD4u37bPU/LZFUPcispY8BoKXmw== X-Received: by 2002:a17:90a:8989:: with SMTP id v9mr6375475pjn.180.1589989713907; Wed, 20 May 2020 08:48:33 -0700 (PDT) Received: from [10.95.89.206] ([162.210.129.5]) by smtp.gmail.com with ESMTPSA id 136sm2450309pfa.152.2020.05.20.08.48.29 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Wed, 20 May 2020 08:48:33 -0700 (PDT) Sender: Tony Li From: tony.li@tony.li Message-Id: <98470E08-B758-45F4-930D-60015D2EAA3B@tony.li> Content-Type: multipart/alternative; boundary="Apple-Mail=_F89A3C54-A41C-4D94-BC51-AF5068239D60" Mime-Version: 1.0 (Mac OS X Mail 13.4 \(3608.80.23.2.2\)) Date: Wed, 20 May 2020 08:48:27 -0700 In-Reply-To: Cc: Huaimo Chen , "lsr@ietf.org" , "Acee Lindem (acee)" To: Gyan Mishra References: <63330FD6-EDE8-4938-AA85-948279C57E34@cisco.com> X-Mailer: Apple Mail (2.3608.80.23.2.2) Archived-At: Subject: Re: [Lsr] Flooding Topology Computation Algorithm - draft-cc-lsr-flooding-reduction-08 Working Group Adoption Call X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 20 May 2020 15:48:40 -0000 --Apple-Mail=_F89A3C54-A41C-4D94-BC51-AF5068239D60 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=us-ascii Hi Gyan, > This is a much needed feature that operators have been needing for = densely meshed topologies that commonly exist in data centers to = accommodate very high bandwidth E-W traffic. Thank you. > Please look at the feature description and it does seem to be exactly = the same as this draft. Please confirm.=20 It would appear to be a different, proprietary, and unpublished = algorithm. =20 This will give us three different implementations, using three different = algorithms, none of which will inter-operate. Whee!!! :-( > There maybe other vendors due to industry demand have to get the = feature deployed before it reaches standards vendor consensus with the = IETF. Our implementation shipped last year. > We are testing this feature and planning to deploy but wanted to = ensure that this is the same as the draft on the standards track. It does not appear to be, but someone from Cisco should confirm. Tony --Apple-Mail=_F89A3C54-A41C-4D94-BC51-AF5068239D60 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=us-ascii

Hi Gyan,


This is a much needed feature that operators have been = needing for densely meshed topologies that commonly exist in data = centers to accommodate very high bandwidth E-W = traffic.

Thank = you.

Please look at the feature description and it does = seem to be exactly the same as this draft.  Please = confirm. 


It would appear to be a different, proprietary, and = unpublished algorithm.  

This = will give us three different implementations, using three different = algorithms, none of which will inter-operate.  Whee!!! = :-(


There maybe other vendors due to = industry demand have to get the feature deployed before it reaches = standards vendor consensus with the IETF.


Our implementation = shipped last year.


We are testing this = feature and planning to deploy but wanted to ensure that this is the = same as the draft on the standards = track.


It does not appear to = be, but someone from Cisco should confirm.

Tony

= --Apple-Mail=_F89A3C54-A41C-4D94-BC51-AF5068239D60-- From nobody Wed May 20 12:58:00 2020 Return-Path: X-Original-To: lsr@ietf.org Delivered-To: lsr@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id 3EC673A0AA5; Wed, 20 May 2020 12:57:44 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: Alissa Cooper via Datatracker To: "The IESG" Cc: draft-ietf-ospf-mpls-elc@ietf.org, lsr-chairs@ietf.org, lsr@ietf.org, Acee Lindem , aretana.ietf@gmail.com, acee@cisco.com X-Test-IDTracker: no X-IETF-IDTracker: 7.0.0 Auto-Submitted: auto-generated Precedence: bulk Reply-To: Alissa Cooper Message-ID: <159000466381.16821.994893511549433009@ietfa.amsl.com> Date: Wed, 20 May 2020 12:57:44 -0700 Archived-At: Subject: [Lsr] Alissa Cooper's No Objection on draft-ietf-ospf-mpls-elc-13: (with COMMENT) X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 20 May 2020 19:57:44 -0000 Alissa Cooper has entered the following ballot position for draft-ietf-ospf-mpls-elc-13: No Objection When responding, please keep the subject line intact and reply to all email addresses included in the To and CC lines. (Feel free to cut this introductory paragraph, however.) Please refer to https://www.ietf.org/iesg/statement/discuss-criteria.html for more information about IESG DISCUSS and COMMENT positions. The document, along with other ballot positions, can be found here: https://datatracker.ietf.org/doc/draft-ietf-ospf-mpls-elc/ ---------------------------------------------------------------------- COMMENT: ---------------------------------------------------------------------- I wasn't clear on where the thread ended up from the Gen-ART review, but I'm nevertheless suggesting some text below to resolve the main sticking point. OLD If the router supports ELs on all of its interfaces, it SHOULD advertise the ELC with every local host prefix it advertises in OSPF. NEW If the router supports ELs on all of its interfaces, it SHOULD advertise the ELC with every local host prefix it advertises in OSPF. The absence of these advertisements implies that advertisement of the ELC is not supported. Not sure if that matches the intent though. From nobody Wed May 20 16:14:39 2020 Return-Path: X-Original-To: lsr@ietf.org Delivered-To: lsr@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id 034093A08EC; Wed, 20 May 2020 16:14:31 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: Kyle Rose via Datatracker To: Cc: draft-ietf-isis-te-app.all@ietf.org, lsr@ietf.org, last-call@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 7.0.0 Auto-Submitted: auto-generated Precedence: bulk Message-ID: <159001647095.11068.10737326366413541910@ietfa.amsl.com> Reply-To: Kyle Rose Date: Wed, 20 May 2020 16:14:31 -0700 Archived-At: Subject: [Lsr] Tsvart last call review of draft-ietf-isis-te-app-13 X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 20 May 2020 23:14:32 -0000 Reviewer: Kyle Rose Review result: Ready with Nits This document has been reviewed as part of the transport area review team's ongoing effort to review key IETF documents. These comments were written primarily for the transport area directors, but are copied to the document's authors and WG to allow them to address any issues raised and also to the IETF discussion list for information. When done at the time of IETF Last Call, the authors should consider this review as part of the last-call comments they receive. Please always CC tsv-art@ietf.org if you reply to or forward this review. This document describes a mechanism for specifying per-application attributes for link state routing using IS-IS. It proposes no routing functionality changes to applications making use of such attributes, only enabling the ability to choose which attributes in an advertisement apply to a particular application, and consequently I see no specifically transport-related issues in this draft. Nonetheless, I have a few comments. * Update language? There are several places in which it is possible that normative language in prior RFCs is revised. For example, in section 6.1, the last paragraph states: New applications which future documents define to make use of the advertisements defined in this document MUST NOT make use of legacy advertisements. This looks like it was written in such a way as to avoid requiring such updates, but it would be good to confirm that there is no normative language in older documents that would conflict with this requirement. * Encoding In section 4.1, the bit masks are defined with a 7 bit length field for which only 4 bits are useful (values 0-8). It may make sense to keep the 3 high order bits as "reserved" and set to zero, but either way it would be nice to understand the justification for whatever design decision is made. You go to some length to save space (e.g., a zero-length SABM means "all applications") but always include an octet for UDABM length, which I presume will be zero outside the lab in most cases. How much does an extra octet cost? If it's a lot, you could use the three high-order bits to represent the first three applications (RSVP-TE, SRTE, and LFA) and save yourself an octet until a fourth application appears. For that matter, how likely are you to get to 256 standardized applications under IS-IS? The fallback from application-specific advertisements to legacy advertisements is not entirely clear. It sounds like: - An application is to use the legacy advertisements if there is at least one application specific advertisement for that application with L=1, in which case *all* advertisements for that application must also have L=1. - An application is to use the application-specific advertisements if there is at least one application specific advertisement for that application with L=0, in which case *all* advertisements for that application must also have L=0, *and* that application is to ignore all legacy advertisements. In effect, use of legacy advertisements vs. app-specific advertisements is all-or-nothing. If that's the case, wouldn't a top-level TLV specifying a legacy mask for applications be more compact, less redundant, and further reduce the overall number/size of advertisements? Anyway, I'm out of my element, so feel free to ignore these comments if I'm way off the mark. 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Thu, 21 May 2020 03:59:09 +0000 From: Huaimo Chen To: Gyan Mishra CC: "Acee Lindem (acee)" , "lsr@ietf.org" Thread-Topic: [Lsr] Flooding Topology Computation Algorithm - draft-cc-lsr-flooding-reduction-08 Working Group Adoption Call Thread-Index: AQHWKvCWbO+rNwui80Sty0q3wo/aI6iuQDRQgAC6fICAAVrmiIAAx0uAgADIYX8= Date: Thu, 21 May 2020 03:59:09 +0000 Message-ID: References: <63330FD6-EDE8-4938-AA85-948279C57E34@cisco.com> , In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: gmail.com; dkim=none (message not signed) header.d=none;gmail.com; dmarc=none action=none header.from=futurewei.com; x-originating-ip: [2601:199:4300:8e5a:9ae:b16d:5e4c:325e] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: dae65ad8-6561-443c-8c80-08d7fd3b50da x-ms-traffictypediagnostic: MN2PR13MB2829: x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:9508; x-forefront-prvs: 041032FF37 x-ms-exchange-senderadcheck: 1 x-microsoft-antispam: BCL:0; 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boundary="_000_MN2PR13MB3117E84C778B11D71FAF8135F2B70MN2PR13MB3117namp_" MIME-Version: 1.0 X-OriginatorOrg: Futurewei.com X-MS-Exchange-CrossTenant-Network-Message-Id: dae65ad8-6561-443c-8c80-08d7fd3b50da X-MS-Exchange-CrossTenant-originalarrivaltime: 21 May 2020 03:59:09.6223 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 0fee8ff2-a3b2-4018-9c75-3a1d5591fedc X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: 9yPw1MPOrwNWkeiA0tpFOVpQGThEoFTya64kiKgP9/EN9GrMGmW+uHSoghkcYfXtraw5YNfXgbfHPapImvcThQ== X-MS-Exchange-Transport-CrossTenantHeadersStamped: MN2PR13MB2829 Archived-At: Subject: Re: [Lsr] Flooding Topology Computation Algorithm - draft-cc-lsr-flooding-reduction-08 Working Group Adoption Call X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 21 May 2020 03:59:17 -0000 --_000_MN2PR13MB3117E84C778B11D71FAF8135F2B70MN2PR13MB3117namp_ Content-Type: text/plain; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable Hi Gyan, Thanks much for your questions. My answers are inline below with [HC]. Best Regards, Huaimo ________________________________ From: Gyan Mishra Sent: Wednesday, May 20, 2020 11:14 AM To: Huaimo Chen Cc: Acee Lindem (acee) ; lsr@ietf.org Subject: Re: [Lsr] Flooding Topology Computation Algorithm - draft-cc-lsr-f= looding-reduction-08 Working Group Adoption Call Huaimo This is a much needed feature that operators have been needing for densely = meshed topologies that commonly exist in data centers to accommodate very h= igh bandwidth E-W traffic. [HC]: Thank you very much. Below is link from Cisco which has introduced feature for dynamic flooding = in clos high density ECMP data center topologies. Please look at the feature description and it does seem to be exactly the s= ame as this draft. Please confirm. [HC]: It seems different. There maybe other vendors due to industry demand have to get the feature de= ployed before it reaches standards vendor consensus with the IETF. https://www.cisco.com/c/en/us/products/collateral/switches/nexus-9000-serie= s-switches/white-paper-c11-743015.html We are testing this feature and planning to deploy but wanted to ensure tha= t this is the same as the draft on the standards track. [HC]: The feature appears implemented draft "Dynamic Flooding on Dense Grap= hs", which does not include any flooding topology computation algorithm. Kind regards Gyan On Tue, May 19, 2020 at 11:52 PM Huaimo Chen > wrote: Hi Gyan, Thank you very much for your questions and support. This Flooding Topology Computation algorithm can be used in the Dynamic= Flooding on Dense Graphs to compute the flooding topologies for the data c= enter clos dense meshed topologies with many ECMP paths. It can be used by = the area leader in the centralized mode to compute the flooding topology. Best Regards, Huaimo ________________________________ From: Lsr > on behalf of = Gyan Mishra > Sent: Tuesday, May 19, 2020 2:39 AM To: Yanhe Fan > Cc: lsr@ietf.org >; = Acee Lindem (acee) > Subject: Re: [Lsr] Flooding Topology Computation Algorithm - draft-cc-lsr-f= looding-reduction-08 Working Group Adoption Call I support WG adoption and have a few questions related to the draft. Does this flooding algorithm use the dynamic flooding algorithm used in dat= a center clos dense meshed topologies with many ECMP paths where the flood = is decoupled from the physical topology. In the dynamic flooding algorithm= mentioned in centralized mode the flooding is computed by the area leader = and distributed to all nodes. In distributed mode each mode the area leade= r determines the algorithm and then each node computes the flooding topolog= y based on the algorithm. This dynamic algorithm for optimized flood reduction would reduce the amoun= t of redundant flooding in highly densely meshed ospf or Isis topologies. = So this optimization of flooding would improving overall link state routing= protocol convergence. Gyan On Mon, May 18, 2020 at 3:37 PM Yanhe Fan > wrote: Support it as a co-author. Thanks, Yanhe From: Lsr > On Behalf Of = Acee Lindem (acee) Sent: Friday, May 15, 2020 3:40 PM To: lsr@ietf.org Subject: [Lsr] Flooding Topology Computation Algorithm - draft-cc-lsr-flood= ing-reduction-08 Working Group Adoption Call This begins a 3 week (due to holidays) WG adoption call for the =93Flooding= Topology Computation Algorithm=94 draft. Please issue your support or obje= ction to this list by 11:59 PM, UTC on June 5th, 2020. Here is a URL for yo= ur convenience. https://datatracker.ietf.org/doc/draft-cc-lsr-flooding-reduction/ Thanks, Acee _______________________________________________ Lsr mailing list Lsr@ietf.org https://www.ietf.org/mailman/listinfo/lsr -- [http://ss7.vzw.com/is/image/VerizonWireless/vz-logo-email] Gyan Mishra Network Solutions Architect M 301 502-1347 13101 Columbia Pike Silver Spring, MD -- [http://ss7.vzw.com/is/image/VerizonWireless/vz-logo-email] Gyan Mishra Network Solutions Architect M 301 502-1347 13101 Columbia Pike Silver Spring, MD --_000_MN2PR13MB3117E84C778B11D71FAF8135F2B70MN2PR13MB3117namp_ Content-Type: text/html; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable
Hi Gyan,

    Thanks much for your questions. My answers are inline below w= ith [HC].

Best Regards,
Huaimo
From: Gyan Mishra <hayab= usagsm@gmail.com>
Sent: Wednesday, May 20, 2020 11:14 AM
To: Huaimo Chen <huaimo.chen@futurewei.com>
Cc: Acee Lindem (acee) <acee=3D40cisco.com@dmarc.ietf.org>; ls= r@ietf.org <lsr@ietf.org>
Subject: Re: [Lsr] Flooding Topology Computation Algorithm - draft-c= c-lsr-flooding-reduction-08 Working Group Adoption Call
 
Huaimo 

This is a much needed feature that operators have been ne= eding for densely meshed topologies that commonly exist in data centers to = accommodate very high bandwidth E-W traffic.
[HC]: Thank you very much.

Below is link from Cisco which has introduced feature for= dynamic flooding in clos high density ECMP data center topologies.

Please look at the feature description and it does seem t= o be exactly the same as this draft.  Please confirm. 
[HC]: It seems different. 

There maybe other vendors due to industry demand have to = get the feature deployed before it reaches standards vendor consensus with = the IETF.


We are testing this feature and planning to deploy but wa= nted to ensure that this is the same as the draft on the standards track.
[HC]: The feature appears implemented draft "Dynamic Flooding on Dense Graph= s", which does not include any flooding topology computation algorithm= . 

Kind regards 

Gyan


On Tue, May 19, 2020 at 11:52 PM Hu= aimo Chen <huaimo.chen@futu= rewei.com> wrote:
Hi G= yan,

&nbs= p;   Thank you very much for your questions and support.

&nbs= p;   This Flooding Topology Computation algorithm can be used in the Dynamic Flooding on Dense Graphs to compute the flooding topologies for the d= ata center clos dense meshed topologies with many ECMP paths. It can be use= d by the area leader in the centralized mode to compute the flooding topolo= gy.   

Best= Regards,
Huai= mo
From: = Lsr <lsr-bounces@ietf.org> on behalf of Gyan Mishra <hayabusagsm@gmail.co= m>
Sent: Tuesday, May 19, 2020= 2:39 AM
To: Yanhe Fan <yfan@casa-systems.com>
Cc: lsr@ietf.org <lsr@ietf.org>; Acee Lindem (ace= e) <acee=3D40cisco.com@dmarc.ietf.org&= gt;
Subject: Re: [Lsr] Flooding= Topology Computation Algorithm - draft-cc-lsr-flooding-reduction-08 Workin= g Group Adoption Call
 

I support WG adoption and have a few questions related to= the draft.

Does this flooding algorithm use the dynamic flooding alg= orithm used in data center clos dense meshed topologies with many ECMP path= s where the flood is decoupled from the physical topology.  In the dyn= amic flooding algorithm mentioned in centralized mode the flooding is computed by the area leader and distributed to all no= des.  In distributed mode each mode the area leader determines the alg= orithm and then each node computes the flooding topology based on the algor= ithm.  

This dynamic algorithm for optimized flood reduction woul= d reduce the amount of redundant flooding in highly densely meshed ospf or = Isis topologies.  So this optimization of flooding would improving ove= rall link state routing protocol convergence.

Gyan 

On Mon, May 18, 2020 at 3:37 PM Yanhe Fan <yfan@casa-systems.com>= ; wrote:

Support it as a co-author.<= /span>

 

Thanks,

Yanhe

_______________________________________________
Lsr mailing list
Lsr@ietf.org
https://www.ietf.org/mailman/listinfo/lsr=
--

=

Gyan M= ishra

Network Solutions Architect 

M 301 502-1347
13101 Columbia Pike 
Silver Spring, MD


--

Gyan Mishra

Network Solutio= ns Architect&= nbsp;

M 301 502-1347
13101 Columbia Pike 
Silver Spring, MD


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aGVyDQo+IHJlZHVjZSB0aGUgb3ZlcmFsbCBudW1iZXIvc2l6ZSBvZiBhZHZlcnRpc2VtZW50cz8N Cj4gDQpbTGVzOl0gVGhlIGluZm9ybWF0aW9uIGJlaW5nIGFkdmVydGlzZWQgaGVyZSAobGluayBh dHRyaWJ1dGVzKSBpcyBuZWNlc3NhcmlseSBhc3NvY2lhdGVkIHdpdGggYSB0b3AgbGV2ZWwgVExW IGRlc2NyaWJpbmcgYSBsaW5rIHRvIGEgbmVpZ2hib3IgKFRMVnMgMjIsIDIzLCAyNSwgMTQxLCAy MjIsIGFuZCAyMjMpIC4gV2l0aG91dCB0aGF0IGNvbnRleHQgdGhlIGxpbmsgYXR0cmlidXRlIGlu Zm9ybWF0aW9uIGlzIG1lYW5pbmdsZXNzLg0KDQpUaGUgb3B0aW9ucyByZWdhcmRpbmcgdXNlIG9m IGxlZ2FjeSBhcmUgZGlzY3Vzc2VkIGluIFNlY3Rpb25zIDYuMSBhbmQgNi4zLg0KDQogICBMZXMN Cg0KPiBBbnl3YXksIEknbSBvdXQgb2YgbXkgZWxlbWVudCwgc28gZmVlbCBmcmVlIHRvIGlnbm9y ZSB0aGVzZSBjb21tZW50cyBpZiBJJ20NCj4gd2F5DQo+IG9mZiB0aGUgbWFyay4NCj4gDQoNCg== From nobody Thu May 21 00:51:37 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 074ED3A0AAA; Thu, 21 May 2020 00:51:20 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -9.601 X-Spam-Level: X-Spam-Status: No, score=-9.601 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIMWL_WL_MED=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, SPF_PASS=-0.001, URIBL_BLOCKED=0.001, USER_IN_DEF_DKIM_WL=-7.5] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=cisco.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id TG_InzKn8Qz3; Thu, 21 May 2020 00:51:18 -0700 (PDT) Received: from aer-iport-4.cisco.com (aer-iport-4.cisco.com [173.38.203.54]) (using TLSv1.2 with cipher DHE-RSA-SEED-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 598DA3A0AA7; Thu, 21 May 2020 00:51:17 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=1850; q=dns/txt; s=iport; t=1590047478; x=1591257078; h=subject:to:cc:references:from:message-id:date: mime-version:in-reply-to:content-transfer-encoding; bh=N13/c3gM9lxqEtbP6895tMCGdFf8JanfcM9cUa6XC0g=; b=A3xcbrXCktkf/882rl6mR6UbPLYCrQ2Wh9I+WD98Xp4ZxWWP28nzYm99 HJ3NGNTAc+NrlLu+1KERVh0H0WwZvC2vlR99eq0lPoap+Gy/34PzIXt45 hsiYCAHBmmkHpQ9yyhIpRwB9w6/BLuiuRrcqihgETBNWgUNE09Z1eVcwu Y=; X-IronPort-AV: E=Sophos;i="5.73,417,1583193600"; d="scan'208";a="26342481" Received: from aer-iport-nat.cisco.com (HELO aer-core-3.cisco.com) ([173.38.203.22]) by aer-iport-4.cisco.com with ESMTP/TLS/DHE-RSA-SEED-SHA; 21 May 2020 07:51:15 +0000 Received: from [10.60.140.51] (ams-ppsenak-nitro2.cisco.com [10.60.140.51]) by aer-core-3.cisco.com (8.15.2/8.15.2) with ESMTP id 04L7pEvv011283; Thu, 21 May 2020 07:51:15 GMT To: Alissa Cooper , The IESG Cc: draft-ietf-ospf-mpls-elc@ietf.org, lsr-chairs@ietf.org, lsr@ietf.org, Acee Lindem , aretana.ietf@gmail.com References: <159000466381.16821.994893511549433009@ietfa.amsl.com> From: Peter Psenak Message-ID: Date: Thu, 21 May 2020 09:51:13 +0200 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:60.0) Gecko/20100101 Thunderbird/60.7.0 MIME-Version: 1.0 In-Reply-To: <159000466381.16821.994893511549433009@ietfa.amsl.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-Outbound-SMTP-Client: 10.60.140.51, ams-ppsenak-nitro2.cisco.com X-Outbound-Node: aer-core-3.cisco.com Archived-At: Subject: Re: [Lsr] Alissa Cooper's No Objection on draft-ietf-ospf-mpls-elc-13: (with COMMENT) X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 21 May 2020 07:51:20 -0000 Hi Alissa, On 20/05/2020 21:57, Alissa Cooper via Datatracker wrote: > Alissa Cooper has entered the following ballot position for > draft-ietf-ospf-mpls-elc-13: No Objection > > When responding, please keep the subject line intact and reply to all > email addresses included in the To and CC lines. (Feel free to cut this > introductory paragraph, however.) > > > Please refer to https://www.ietf.org/iesg/statement/discuss-criteria.html > for more information about IESG DISCUSS and COMMENT positions. > > > The document, along with other ballot positions, can be found here: > https://datatracker.ietf.org/doc/draft-ietf-ospf-mpls-elc/ > > > > ---------------------------------------------------------------------- > COMMENT: > ---------------------------------------------------------------------- > > I wasn't clear on where the thread ended up from the Gen-ART review, but I'm > nevertheless suggesting some text below to resolve the main sticking point. > > OLD > If the router supports ELs on all of its interfaces, it SHOULD advertise the > ELC with every local host prefix it advertises in OSPF. > > NEW > If the router supports ELs on all of its interfaces, it SHOULD advertise the > ELC with every local host prefix it advertises in OSPF. The absence of these > advertisements implies that advertisement of the ELC is not supported. I added the suggested text, plus I added "OSPF" at the end. So the text is: "If the router supports ELs on all of its interfaces, it SHOULD advertise the ELC with every local host prefix it advertises in OSPF. The absence of these advertisements implies that advertisement of the ELC is not supported in OSPF." I added similar text to ISIS ELC draft. thanks, Peter > > Not sure if that matches the intent though. > > > > > From nobody Thu May 21 03:06:08 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 450053A0B6A; Thu, 21 May 2020 03:05:58 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -9.601 X-Spam-Level: X-Spam-Status: No, score=-9.601 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIMWL_WL_MED=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, SPF_PASS=-0.001, URIBL_BLOCKED=0.001, USER_IN_DEF_DKIM_WL=-7.5] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=cisco.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Qh1MtdDsgT6g; Thu, 21 May 2020 03:05:56 -0700 (PDT) Received: from aer-iport-3.cisco.com (aer-iport-3.cisco.com [173.38.203.53]) (using TLSv1.2 with cipher DHE-RSA-SEED-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 9CDF43A0B8B; Thu, 21 May 2020 03:05:42 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=7200; q=dns/txt; s=iport; t=1590055543; x=1591265143; h=subject:to:cc:references:from:message-id:date: mime-version:in-reply-to:content-transfer-encoding; bh=SoFkxgQ5QbQ9V/aoh0dzG9xPkZcpNo1hABdmZsuwy48=; b=bo/R72AccDecPVw9u6RVXWCX747VcCvkS5wN66HbUCKw2k8DVVZyclGu H5lsearbqycySo0gQlEgZ586GQaS0HkIpqR/p8IJpCr/irZ6qf7yr/BMH yLezdn9AQC1Q7wX1j6PAwHSgCmxMePIov/zD3v2oisMUmUPrTzEZjNy7b g=; X-IronPort-AV: E=Sophos;i="5.73,417,1583193600"; d="scan'208";a="24077997" Received: from aer-iport-nat.cisco.com (HELO aer-core-1.cisco.com) ([173.38.203.22]) by aer-iport-3.cisco.com with ESMTP/TLS/DHE-RSA-SEED-SHA; 21 May 2020 10:05:40 +0000 Received: from [10.60.140.51] (ams-ppsenak-nitro2.cisco.com [10.60.140.51]) by aer-core-1.cisco.com (8.15.2/8.15.2) with ESMTP id 04LA5dQP024246; Thu, 21 May 2020 10:05:40 GMT To: Benjamin Kaduk , The IESG Cc: draft-ietf-isis-mpls-elc@ietf.org, lsr-chairs@ietf.org, lsr@ietf.org, Acee Lindem , aretana.ietf@gmail.com References: <158992828112.6026.1646593855480055081@ietfa.amsl.com> From: Peter Psenak Message-ID: <1242ad52-bb48-8526-b65b-d413e0cd9e25@cisco.com> Date: Thu, 21 May 2020 12:05:39 +0200 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:60.0) Gecko/20100101 Thunderbird/60.7.0 MIME-Version: 1.0 In-Reply-To: <158992828112.6026.1646593855480055081@ietfa.amsl.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-Outbound-SMTP-Client: 10.60.140.51, ams-ppsenak-nitro2.cisco.com X-Outbound-Node: aer-core-1.cisco.com Archived-At: Subject: Re: [Lsr] Benjamin Kaduk's Discuss on draft-ietf-isis-mpls-elc-12: (with DISCUSS and COMMENT) X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 21 May 2020 10:05:59 -0000 Benjamin, thanks for review, please see inline (##PP): On 20/05/2020 00:44, Benjamin Kaduk via Datatracker wrote: > Benjamin Kaduk has entered the following ballot position for > draft-ietf-isis-mpls-elc-12: Discuss > > When responding, please keep the subject line intact and reply to all > email addresses included in the To and CC lines. (Feel free to cut this > introductory paragraph, however.) > > > Please refer to https://www.ietf.org/iesg/statement/discuss-criteria.html > for more information about IESG DISCUSS and COMMENT positions. > > > The document, along with other ballot positions, can be found here: > https://datatracker.ietf.org/doc/draft-ietf-isis-mpls-elc/ > > > > ---------------------------------------------------------------------- > DISCUSS: > ---------------------------------------------------------------------- > > As for other reviewers, many of my comments duplicate those for the OSPF > document; I expect that the analogous responses apply and am fine if > they only appear for one document's review. > > Here, the question I have about normative language applies to the text > in Section 3: > > When a router propagates a prefix between ISIS levels ([RFC5302], it > MUST preserve the ELC signaling for this prefix. > > The scenario in question is analogous to the OSPF cross-area case: is > the router propagating the prefix between ISIS levels required to > implement this document; is preservation of the flag value a new > requirement from this document vs. a preexisting property; and is this > document trying to make normative requirements of devices that don't > implement this document? ##PP this is a new requirement and only applies to the routers that support this document. We are not making normative requirements of devices that don't implement this document, we cannot. Maybe we can add that it only applies to the routers that supports this extension: "When a router supporting this extension propagates a prefix between ISIS levels ([RFC5302], it MUST preserve the ELC signaling for this prefix." Would it work? > > Likewise, the ASBR case for cross-protocol redistribution seems to > rather inherently require understanding the semantics of the flags being > translated. similarly to the above I can chnage to: "When a router supporting this extension redistribute a prefix ..." > > > ---------------------------------------------------------------------- > COMMENT: > ---------------------------------------------------------------------- > > Section 1 > > Should we add a sentence at the end of the last paragraph about how > "this document defines a mechanism to signal the ERLD using IS-IS"? not sure I understand, how is described in the body of the document. > > In cases where LSPs are used (e.g., SR-MPLS [RFC8660], it would be > > side note(?): I don't know that SR-MPLS is so popular so as to be > privileged as the only example given for LSP usage. If we instead > talked about using IGPs to signal labels, this selection would seem less > surprising to me. this document describes the ELC/ERLD capability signaling for SR MPLS. For non SR MPLS cases, thee are existing mechanisms to learn ELC/ERLD. I can replace the text with: "In cases where SR is used with the MPLS Data Plane" Would it work? > > Section 3 > > unless all of its interfaces are capable of processing ELs. If a > router supports ELs on all of its interfaces, it SHOULD set the ELC > for every local host prefix it advertises in IS-IS. > > Do we want to say anything about (not) advertising the ELC for other > prefixes? Do we have to? I can add "MUST NOT set ELC with for any other prefix", but I find it unneeded. > > Section 4 > > I agree with Roman's comment about code 2 vs TBD2. that has been fixed already. > > ERLD in the range between 0 to 255. The scope of the advertisement > depends on the application. If a router has multiple interfaces with > > Just to check: w.r.t. "scope", both this document and the OSPF one only > define usage of this MSD type at the scope of a single node, right? (I > don't see a particular reason to preclude using it at a different > scope.) the scope here means where the information will be flooded - area only or network wide. No such thing as a node scope. > > Section 6 > > - Bit 3 in the Bit Values for Prefix Attribute Flags Sub-TLV > registry has been assigned to the ELC Flag. IANA is asked to > > Is there an "IS-IS" in the name of this registry? no the registry name is "Bit Values for Prefix Attribute Flags Sub-TLV". > > Section 7 > > Should we say anything about considerations for redistributing ELC/ERLD > information at the ASBR with respect to exposing "internal information" > to external parties? why would this be "internal information" and why redistribution would be "external party"? Redistribution between IGPs is predominantly done between IGPs under same administrative domain. > > This document specifies the ability to advertise additional node > capabilities using IS-IS and BGP-LS. As such, the security > considerations as described in [RFC7981], [RFC7752], [RFC7794], > [RFC8491], [RFC8662], [I-D.ietf-idr-bgp-ls-segment-routing-ext] and > > RFC 8662's security considerations have a pretty hard dependency on RFC > 6790's security considerations; it might be worth mentioning 6790 > directly in this list as well. would not that be implicit when mentioning RFC 8662? > > [I-D.ietf-idr-bgp-ls-segment-routing-msd] are applicable to this > document. > > Could we also have a brief note that the normal IS-IS authentication > mechanisms serve to protect the ELC/ERLD information? do we need to repeat this every time we add a bit in the TLV? > > Incorrectly setting the E flag during origination, propagation or > redistribution may lead to black-holing of the traffic on the egress > node. > > This is what happens when the E flag should not be set but is > erroneously set. Should we also say what happens if we should set the E > flag but erroneously clear it (e.g., that poor or no load-balancing may > occur)? yes, there is a text there already: "Incorrectly setting of the ERLD value may lead to poor or no load-balancing of the traffic." > > Section 8 > > I do see the note in the shepherd writeup about the sixth author (thank > you!); if we're already breaking through the 5-author limit, did we > consider making those who "should be considered as co-authors" listed as > co-authors? I'm not fun of this 5 authors rule to be honest. > > Section 10.1 > > Should we reference RFC 7981 from Section 4 as well? Right now we seem > to only use it for the security considerations, which is not necessarily > enough to qualify it as a normative reference. we reference RFC8491, which references RFC 7981. I don't see a need to reference RFC 7981 directly. thanks, Peter > > > > > From nobody Thu May 21 03:17:08 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 231E63A0B9E; Thu, 21 May 2020 03:16:52 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -9.601 X-Spam-Level: X-Spam-Status: No, score=-9.601 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIMWL_WL_MED=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, SPF_PASS=-0.001, URIBL_BLOCKED=0.001, USER_IN_DEF_DKIM_WL=-7.5] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=cisco.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id cgAu4FYEuG1J; Thu, 21 May 2020 03:16:49 -0700 (PDT) Received: from aer-iport-1.cisco.com (aer-iport-1.cisco.com [173.38.203.51]) (using TLSv1.2 with cipher DHE-RSA-SEED-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 49DBF3A0B9C; Thu, 21 May 2020 03:16:48 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=6198; q=dns/txt; s=iport; t=1590056208; x=1591265808; h=subject:to:cc:references:from:message-id:date: mime-version:in-reply-to:content-transfer-encoding; bh=RpD3trOwcFGnfi3gXy/U93KAbybzR/i3XRyDJXkr760=; b=B+dbz4aAdcBjEw7aXHd6xK5uqj+Q+N+Qx5Z9RUS3Ndo2qfK3iHOL6lCb fT7OsqF8PJJnVrcMRDuzEhVZqlaOnJ0UMuPdG/jsye6Y0cgbLVUYXPtiP C6BRVX9KWD0+5CzYMMKVVlf1ObFbDLRuiIKUWCEihqj3kz81amZ1sHRwU 0=; X-IronPort-AV: E=Sophos;i="5.73,417,1583193600"; d="scan'208";a="26408253" Received: from aer-iport-nat.cisco.com (HELO aer-core-2.cisco.com) ([173.38.203.22]) by aer-iport-1.cisco.com with ESMTP/TLS/DHE-RSA-SEED-SHA; 21 May 2020 10:16:46 +0000 Received: from [10.60.140.51] (ams-ppsenak-nitro2.cisco.com [10.60.140.51]) by aer-core-2.cisco.com (8.15.2/8.15.2) with ESMTP id 04LAGiTY011668; Thu, 21 May 2020 10:16:46 GMT To: Benjamin Kaduk , The IESG Cc: draft-ietf-ospf-mpls-elc@ietf.org, lsr-chairs@ietf.org, lsr@ietf.org, Acee Lindem , aretana.ietf@gmail.com References: <158992822966.6522.4643872233017159559@ietfa.amsl.com> From: Peter Psenak Message-ID: Date: Thu, 21 May 2020 12:16:44 +0200 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:60.0) Gecko/20100101 Thunderbird/60.7.0 MIME-Version: 1.0 In-Reply-To: <158992822966.6522.4643872233017159559@ietfa.amsl.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-Outbound-SMTP-Client: 10.60.140.51, ams-ppsenak-nitro2.cisco.com X-Outbound-Node: aer-core-2.cisco.com Archived-At: Subject: Re: [Lsr] Benjamin Kaduk's Discuss on draft-ietf-ospf-mpls-elc-13: (with DISCUSS and COMMENT) X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 21 May 2020 10:16:52 -0000 Hi Benjamin, thanks for review. Please see inline (##PP) two responses to OSPF specific comments. On 20/05/2020 00:43, Benjamin Kaduk via Datatracker wrote: > Benjamin Kaduk has entered the following ballot position for > draft-ietf-ospf-mpls-elc-13: Discuss > > When responding, please keep the subject line intact and reply to all > email addresses included in the To and CC lines. (Feel free to cut this > introductory paragraph, however.) > > > Please refer to https://www.ietf.org/iesg/statement/discuss-criteria.html > for more information about IESG DISCUSS and COMMENT positions. > > > The document, along with other ballot positions, can be found here: > https://datatracker.ietf.org/doc/draft-ietf-ospf-mpls-elc/ > > > > ---------------------------------------------------------------------- > DISCUSS: > ---------------------------------------------------------------------- > > I have a question about the scope of some normative language, which may > or may not be problematic but I'm too ignorant of OSPF details to be > able to answer myself. In Section 3 we say that: > > When an OSPF Area Border Router (ABR) distributes information between > connected areas it MUST preserve the ELC setting. > > My undesrtanding is that it's normal operation for an ABR to > distribution information about prefixes and such between areas, and in > particular that an ABR does not necessarily need to know the semantic > details of every bit of information being distributed in that fashion. > So, I am imagining a scenario where some routers in both areas > advertise/understand the ELC flag but the ABR between them does not > implement this spec. What would happen in such a scenario? If the ABR > is still expected to distribute the ELC setting without change, isn't > that just a core requirement from the respective OSPF specs, as opposed > to a new requirement imposed by this spec (which, in this scenario, the > ABR is not claiming to adhere to anyway)? > > There is perhaps a similar question about the ASBR guidance, though when > doing cross-protocol signalling there is a more clear need for the ASBR > to understand the semantics of the flags it is redistributing (and it's > only a "SHOULD"). > > > ---------------------------------------------------------------------- > COMMENT: > ---------------------------------------------------------------------- > > Section 1 > > The abstract is pretty explicit that "this draft defines" both ELC and > ERLD signaling capabilities, but this section only has a clear statement > for the ELC. Should we put something at the end of the last paragraph > about "this document defines a mechanism to signal the ERLD using OSPFv2 > and OSPFv3"? ##PP this has been already addressed based on previous comments. Latest text is as follows: "Multiprotocol Label Switching (MPLS) has defined a mechanism to load-balance traffic flows using Entropy Labels (EL). An ingress Label Switching Router (LSR) cannot insert ELs for packets going into a given Label Switched Path (LSP) unless an egress LSR has indicated via signaling that it has the capability to process ELs, referred to as the Entropy Label Capability (ELC), on that LSP. In addition, it would be useful for ingress LSRs to know each LSR's capability for reading the maximum label stack depth and performing EL-based load-balancing, referred to as Entropy Readable Label Depth (ERLD). This document defines a mechanism to signal these two capabilities using OSPFv2 and OSPFv3 and BGP-LS." > > In cases where LSPs are used (e.g., SR-MPLS [RFC8660], it would be > > side note(?): I don't know that SR-MPLS is so popular so as to be > privileged as the only example given for LSP usage. If we instead > talked about using IGPs to signal labels, this selection would seem less > surprising to me. > > Section 3 > > If the router supports ELs on all of its interfaces, it SHOULD > advertise the ELC with every local host prefix it advertises in OSPF. > > Do we want to say anything about (not) advertising the ELC for other > prefixes? > > Section 7 > > Should we say anything about considerations for redistributing ELC/ERLD > information at the ASBR with respect to exposing "internal information" > to external parties? > > This document specifies the ability to advertise additional node > capabilities using OSPF and BGP-LS. As such, the security > considerations as described in [RFC5340], [RFC7770], [RFC7752], > [RFC7684], [RFC8476], [RFC8662], > > RFC 8662's security considerations have a pretty hard dependency on RFC > 6790's security considerations; it might be worth mentioning 6790 > directly in this list as well. > > [I-D.ietf-idr-bgp-ls-segment-routing-ext] and > [I-D.ietf-idr-bgp-ls-segment-routing-msd] are applicable to this > document. > > Could we also have a brief note that the (respective) OSPF security > mechanisms serve to protect the ELC/ERLD information? > > Incorrectly setting the E flag during origination, propagation or > redistribution may lead to black-holing of the traffic on the egress > node. > > This is what happens when the E flag should not be set but is > erroneously set. Should we also say what happens if we should set the E > flag but erroneously clear it (e.g., that poor or no load-balancing may > occur)? > > Section 8 > > I do see the note in the shepherd writeup about the sixth author (thank > you!); if we're already breaking through the 5-author limit, did we > consider making those who "should be considered as co-authors" listed as > co-authors? > > Section 10.2 > > It's slightly surprising to see the core OSPF protocols only listed as > informative, but I can see how they are to be considered "basic > specifications" in the vein of > https://www.ietf.org/about/groups/iesg/statements/normative-informative-references/ ##PP right, I can add it as normative, or remove completely, or keep as informative. Whatever you like :) thanks, Peter > > > > > From nobody Thu May 21 04:44:59 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 839AD3A0BCF; Thu, 21 May 2020 04:44:40 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.098 X-Spam-Level: X-Spam-Status: No, score=-2.098 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, UNPARSEABLE_RELAY=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id BQQKhSqL-v7V; Thu, 21 May 2020 04:44:39 -0700 (PDT) Received: from mail-wr1-x42a.google.com (mail-wr1-x42a.google.com [IPv6:2a00:1450:4864:20::42a]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id C53883A085C; Thu, 21 May 2020 04:44:38 -0700 (PDT) Received: by mail-wr1-x42a.google.com with SMTP id w7so6304602wre.13; Thu, 21 May 2020 04:44:38 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:in-reply-to:references:mime-version:date:message-id:subject:to :cc:content-transfer-encoding; bh=3u3kyW2m9beL+RlcXbScO1Gd2aDH5e+xPkESMVYnTJQ=; b=Q4U8Lit/kbt9Oml4ftLvdjupODT2OZnVGDY6WKQT+SbuUZMhkaQwvsa6mATvhMaac5 gFHCmqelJqqXZGdV+aVjGZnozyX3IGy9rfhCNbp9AC11o86CUkNrYY1o1fIsH97l3GtM cDZRQb/3nERx7SGt/Rc2ff91+Qf/xdkkThkbJfOqcSMRB/R4ozOz3alIHlLBrfAH4kcr rvQ1+8uItgqOYM9nUtTDN+bfkhFCtCuCI4XaaAi4yU/DfWRNatWV9NdGICeOgmrvoJPU zxD6o477Sac30x7k9E7RQcz/OZAEIU0LFiW+l0amm5tbnMMkcFTmbocTbmMHiAZGE4sN 5f/g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:in-reply-to:references:mime-version:date :message-id:subject:to:cc:content-transfer-encoding; bh=3u3kyW2m9beL+RlcXbScO1Gd2aDH5e+xPkESMVYnTJQ=; b=FFX45pZWSEOhQhtnr9bE/06Bhu0zqJ4+8/Z8rEz5UKOZjt0HGMy23EEKjYbNyR2WS0 XYuQ7rRikg4ekgEiqbtWSqxzqYhKD6ielmVK/r6Fnj1/ZNREEdB8Xrvyl/M1zOcJFtkq 36glr8spGkLIB54fjlUvJolTXcRlzZ+Nn1HDLIeTnha/hSS5lGOoSU67KFoVWdzLhGuN MZYiZ2eS0nSiK3HLg3KU41TxkwR6ChclD/9zYOUWxqXm6x1fn0c+ZFQkTu/xROPz1e/X 2Vx7hMntUwRo5Z+uWYrGYSEUJYK3BJp/mBjoyYgLE8kAs85wtvV38UlgNF5JisLJMhat FvPQ== X-Gm-Message-State: AOAM531n9ZAlH4gmZndPAX2UHSkCpJLxHGZxA93M05QTxNfwtzAGxbVu YjheDiUYl9UCtw7DKqHeBgJoZTCwGgrLZ9KPE84= X-Google-Smtp-Source: ABdhPJzeFqJIQNd/hSaIn7xOW79s1W6bMJf++JXslg8+NvGZKBFeQuOSB0Y3rp5uG0xsmQxykbFMJcn8jSP7aKMjIPk= X-Received: by 2002:adf:ef83:: with SMTP id d3mr4993338wro.145.1590061477054; Thu, 21 May 2020 04:44:37 -0700 (PDT) Received: from 1058052472880 named unknown by gmailapi.google.com with HTTPREST; Thu, 21 May 2020 11:44:36 +0000 From: Alvaro Retana In-Reply-To: <1242ad52-bb48-8526-b65b-d413e0cd9e25@cisco.com> References: <158992828112.6026.1646593855480055081@ietfa.amsl.com> <1242ad52-bb48-8526-b65b-d413e0cd9e25@cisco.com> MIME-Version: 1.0 Date: Thu, 21 May 2020 11:44:36 +0000 Message-ID: To: Benjamin Kaduk , Peter Psenak , The IESG Cc: Acee Lindem , draft-ietf-isis-mpls-elc@ietf.org, lsr-chairs@ietf.org, lsr@ietf.org Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Archived-At: Subject: Re: [Lsr] Benjamin Kaduk's Discuss on draft-ietf-isis-mpls-elc-12: (with DISCUSS and COMMENT) X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 21 May 2020 11:44:41 -0000 On May 21, 2020 at 6:05:41 AM, Peter Psenak wrote: Peter: Hi! > > ---------------------------------------------------------------------- > > DISCUSS: > > ---------------------------------------------------------------------- > > > > As for other reviewers, many of my comments duplicate those for the OSP= F > > document; I expect that the analogous responses apply and am fine if > > they only appear for one document's review. > > > > Here, the question I have about normative language applies to the text > > in Section 3: > > > > When a router propagates a prefix between ISIS levels ([RFC5302], it > > MUST preserve the ELC signaling for this prefix. > > > > The scenario in question is analogous to the OSPF cross-area case: is > > the router propagating the prefix between ISIS levels required to > > implement this document; is preservation of the flag value a new > > requirement from this document vs. a preexisting property; and is this > > document trying to make normative requirements of devices that don't > > implement this document? > > ##PP > this is a new requirement and only applies to the routers that support > this document. We are not making normative requirements of devices that > don't implement this document, we cannot. > > Maybe we can add that it only applies to the routers that supports this > extension: > > "When a router supporting this extension propagates a prefix between > ISIS levels ([RFC5302], it MUST preserve the ELC signaling for this prefi= x." > > Would it work? You're right, we can only apply requirements to routers that support this specification. =C2=A0IOW, adding the clarification is not necessary. My interpretation of Ben's question is two-fold: (1) Would ISIS routers normally propagate the information to a different level? =C2=A0The ELC is a new prefix attribute flag -- are prefix attributes always propagated (unchanged) to other levels? =C2=A0If so, then the requirement (MUST) is not needed. =C2=A0My reading of rfc7794 is that the propagation is optional... (2) If the propagation is not automatic, and the L1L2 router doesn't support this specification, then what are the drawbacks/failure scenarios? =C2=A0IOW, for multi-level operation is it a requirement that the L1L2 support this specification? Thanks! Alvaro. From nobody Thu May 21 05:15:57 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id C15473A0C0F; Thu, 21 May 2020 05:15:42 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -9.601 X-Spam-Level: X-Spam-Status: No, score=-9.601 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIMWL_WL_MED=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, SPF_PASS=-0.001, URIBL_BLOCKED=0.001, USER_IN_DEF_DKIM_WL=-7.5] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=cisco.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id w6KkL6S9NUEC; Thu, 21 May 2020 05:15:41 -0700 (PDT) Received: from aer-iport-2.cisco.com (aer-iport-2.cisco.com [173.38.203.52]) (using TLSv1.2 with cipher DHE-RSA-SEED-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 504A53A08A7; Thu, 21 May 2020 05:15:40 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=2717; q=dns/txt; s=iport; t=1590063340; x=1591272940; h=subject:to:cc:references:from:message-id:date: mime-version:in-reply-to:content-transfer-encoding; bh=CUWOlNWyQ8ifdIfXLSO2ho+YAnqZOlRllU3+C8nic/w=; b=I669XVUmY3BHb4KCuNG+2PjI3sVLtF2se7droF0FsQqKphFbdwi2ssbP AesJD6S6iADdAFQEOwWtxTneygXzzbdVPhzUqmEGEh86/ajyfLPnBQzd+ flLw+czWbsoDHWWDJIOq5w+ZVt2NkkzPvleYIWEEBMMDkNg8sseJNSpY6 M=; X-IronPort-AV: E=Sophos;i="5.73,417,1583193600"; d="scan'208";a="26414062" Received: from aer-iport-nat.cisco.com (HELO aer-core-3.cisco.com) ([173.38.203.22]) by aer-iport-2.cisco.com with ESMTP/TLS/DHE-RSA-SEED-SHA; 21 May 2020 12:15:38 +0000 Received: from [10.60.140.51] (ams-ppsenak-nitro2.cisco.com [10.60.140.51]) by aer-core-3.cisco.com (8.15.2/8.15.2) with ESMTP id 04LCFbqU018120; Thu, 21 May 2020 12:15:38 GMT To: Alvaro Retana , Benjamin Kaduk , The IESG Cc: Acee Lindem , draft-ietf-isis-mpls-elc@ietf.org, lsr-chairs@ietf.org, lsr@ietf.org References: <158992828112.6026.1646593855480055081@ietfa.amsl.com> <1242ad52-bb48-8526-b65b-d413e0cd9e25@cisco.com> From: Peter Psenak Message-ID: Date: Thu, 21 May 2020 14:15:37 +0200 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:60.0) Gecko/20100101 Thunderbird/60.7.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit X-Outbound-SMTP-Client: 10.60.140.51, ams-ppsenak-nitro2.cisco.com X-Outbound-Node: aer-core-3.cisco.com Archived-At: Subject: Re: [Lsr] Benjamin Kaduk's Discuss on draft-ietf-isis-mpls-elc-12: (with DISCUSS and COMMENT) X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 21 May 2020 12:15:43 -0000 Hi Alvaro, On 21/05/2020 13:44, Alvaro Retana wrote: > On May 21, 2020 at 6:05:41 AM, Peter Psenak wrote: > > > Peter: > > Hi! > > >>> ---------------------------------------------------------------------- >>> DISCUSS: >>> ---------------------------------------------------------------------- >>> >>> As for other reviewers, many of my comments duplicate those for the OSPF >>> document; I expect that the analogous responses apply and am fine if >>> they only appear for one document's review. >>> >>> Here, the question I have about normative language applies to the text >>> in Section 3: >>> >>> When a router propagates a prefix between ISIS levels ([RFC5302], it >>> MUST preserve the ELC signaling for this prefix. >>> >>> The scenario in question is analogous to the OSPF cross-area case: is >>> the router propagating the prefix between ISIS levels required to >>> implement this document; is preservation of the flag value a new >>> requirement from this document vs. a preexisting property; and is this >>> document trying to make normative requirements of devices that don't >>> implement this document? >> >> ##PP >> this is a new requirement and only applies to the routers that support >> this document. We are not making normative requirements of devices that >> don't implement this document, we cannot. >> >> Maybe we can add that it only applies to the routers that supports this >> extension: >> >> "When a router supporting this extension propagates a prefix between >> ISIS levels ([RFC5302], it MUST preserve the ELC signaling for this prefix." >> >> Would it work? > > > You're right, we can only apply requirements to routers that support > this specification.  IOW, adding the clarification is not necessary. > > > My interpretation of Ben's question is two-fold: > > (1) Would ISIS routers normally propagate the information to a > different level?  The ELC is a new prefix attribute flag -- are prefix > attributes always propagated (unchanged) to other levels?  If so, then > the requirement (MUST) is not needed.  My reading of rfc7794 is that > the propagation is optional... depends on the attribute or a bit. Some are propagated some are not. That's why we are saying this one MUST be preserved. > > (2) If the propagation is not automatic, and the L1L2 router doesn't > support this specification, then what are the drawbacks/failure > scenarios?  IOW, for multi-level operation is it a requirement that > the L1L2 support this specification? drawback are identical to what is mentioned in the Security Considerations section. thanks, Peter > > > Thanks! > > Alvaro. > > From nobody Thu May 21 06:09:25 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id C68D53A0C71 for ; Thu, 21 May 2020 06:08:45 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.098 X-Spam-Level: X-Spam-Status: No, score=-2.098 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=unavailable autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=krose.org Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id q9pPNqxE6GOz for ; Thu, 21 May 2020 06:08:43 -0700 (PDT) Received: from mail-ua1-x930.google.com (mail-ua1-x930.google.com [IPv6:2607:f8b0:4864:20::930]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 055083A0C6E for ; Thu, 21 May 2020 06:08:42 -0700 (PDT) Received: by mail-ua1-x930.google.com with SMTP id f9so2548061uaq.2 for ; Thu, 21 May 2020 06:08:42 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=krose.org; s=google; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=dC7x8Fwk62lXhe5QA+M0WmsxvY5U8aoS0MTfCoqJRu8=; b=W32uAf1+UYGLgoW9NFjkeCwxha4eCheLRpOpb6dlco0n00fVdG+8S11XS+jQvSPkNS nggME+YBE1FksnfGNTi6eTE7G99VJCvdpLBXzLbH5b+ZXUdvhTGUMqy3NTNPRwDhrMuz bznWODvIR4Pg2gwEHsCrUiFy5VPm+N6lOmaE0= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=dC7x8Fwk62lXhe5QA+M0WmsxvY5U8aoS0MTfCoqJRu8=; b=Y2u2OWAi17pUDLlCOBrTKbRHlmyp47C+eVpkeTeK/QaPoOqNv2HChF2vZiYPlpYQ5W OWGggVvZFf+gIIoIXXdSOyal7v0+lnv9D5dvoicJsbShw0H6wm8yB9IJ6Q+qfI6eqyZc GqUrW9SmF0Wz8XzvoZKE3emD+yQkZP2OFUiAjzEswhK/VCKsO2vefHCJymnhpqSy12Zk PzS4VE7c/x91hpNHINmTtzxV0DaVx0z1B7VfkntNNn0Am9Qf2hZko6mqekd1FwN27eCP WwU9Lni/Xn9icHOgrPGdnzgMfRoy4vTn2ehBiuS+yllKU4lggPfIheIKeuV9VzrDR5EN QwdA== X-Gm-Message-State: AOAM53266fkgm3dxHSD5vZULdoWrm/9lh4KLciSgui7B0ZWggTp5z11J aD14lyAyxoTuS6q95kILVX6p5mX9QJMMj8qRxmPM/A== X-Google-Smtp-Source: ABdhPJxgCS+DM4pUzw/8RB3VpLRxTwxVA10aH2/FZ1DsYITesOPlPe7+RMRW4nHxmvFhaUrgJD2ENOB+cNILGcwFzG0= X-Received: by 2002:a9f:2603:: with SMTP id 3mr6838492uag.57.1590066521304; Thu, 21 May 2020 06:08:41 -0700 (PDT) MIME-Version: 1.0 References: <159001647095.11068.10737326366413541910@ietfa.amsl.com> In-Reply-To: From: Kyle Rose Date: Thu, 21 May 2020 09:08:30 -0400 Message-ID: To: "Les Ginsberg (ginsberg)" Cc: "tsv-art@ietf.org" , "draft-ietf-isis-te-app.all@ietf.org" , "lsr@ietf.org" , "last-call@ietf.org" Content-Type: multipart/alternative; boundary="0000000000002c093f05a6283661" Archived-At: Subject: Re: [Lsr] Tsvart last call review of draft-ietf-isis-te-app-13 X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 21 May 2020 13:08:46 -0000 --0000000000002c093f05a6283661 Content-Type: text/plain; charset="UTF-8" On Thu, May 21, 2020 at 2:28 AM Les Ginsberg (ginsberg) wrote: > > * Update language? > > > > There are several places in which it is possible that normative language > in > > prior RFCs is revised. For example, in section 6.1, the last paragraph > states: > > > > New applications which future documents define to make use of the > > advertisements defined in this document MUST NOT make use of legacy > > advertisements. > > > > This looks like it was written in such a way as to avoid requiring such > > updates, but it would be good to confirm that there is no normative > language > > in > > older documents that would conflict with this requirement. > > > [Les:] For applications which preexisted the writing of this draft (the > ones defined in Section 7.4) there are existing deployments which use > legacy advertisements. > Transitioning to use new advertisements has to account for partial > deployment of such support. > And the transition has to be managed by the network operator using knobs > provided by implementations. This is onerous - but unavoidable in these > cases. > > For new applications we want to avoid this complexity/pain. So we specify > new applications MUST use the new advertisements from day ONE. > > As these are new applications there is no legacy to deal with and no > existing specification which would be in conflict. > That's what I figured. Is it the case that new standardized applications require an RFC? If so, I think this is fine. > > * Encoding > > > > In section 4.1, the bit masks are defined with a 7 bit length field for > which > > only 4 bits are useful (values 0-8). It may make sense to keep the 3 > high order > > bits as "reserved" and set to zero, but either way it would be nice to > > understand the justification for whatever design decision is made. > > > > You go to some length to save space (e.g., a zero-length SABM means "all > > applications") but always include an octet for UDABM length, which I > > presume > > will be zero outside the lab in most cases. How much does an extra octet > > cost? > > If it's a lot, you could use the three high-order bits to represent the > first > > three applications (RSVP-TE, SRTE, and LFA) and save yourself an octet > until a > > fourth application appears. > > > > For that matter, how likely are you to get to 256 standardized > applications > > under IS-IS? > > > [Les:] The limitation for the xABM length to be no more than 8 bytes was > introduced only recently based on a review comment. > The concern was that without a limit, it would be theoretically possible > for the ABM itself to consume the full sub-TLV space, leaving no room for > the actual link attribute advertisements. > So we placed a maximum length to avoid this potential issue. > As each application consumes one bit, with an 8 byte maximum length we can > support 64 applications. > Sigh... yes, math is hard. > This seems more than we will ever get to - but if anyone in the WG thinks > this is not large enough they should speak now so we can increase the > maximum. > I suspect even 64 is safely more than you'll need, but if not there's always the possibility of a new TLV later on. :-) > There are existing implementations of this draft which have been deployed. > Changing the bit positions as you suggested would not be backwards > compatible. > I do not think the small space savings would be worth the trouble. > Understood, though I will point out that this illustrates the potential harm in deploying something hard to change prior to standardization. Thankfully, IS-IS is not interdomain, meaning that any such change would impose costs only on those who deployed early. > > In effect, use of legacy advertisements vs. app-specific advertisements > is > > all-or-nothing. If that's the case, wouldn't a top-level TLV specifying a > > legacy mask for applications be more compact, less redundant, and further > > reduce the overall number/size of advertisements? > > > [Les:] The information being advertised here (link attributes) is > necessarily associated with a top level TLV describing a link to a neighbor > (TLVs 22, 23, 25, 141, 222, and 223) . Without that context the link > attribute information is meaningless. > Yes, this makes sense, and probably would have been obvious were I more familiar with IS-IS and link state routing in general. Thanks, Kyle --0000000000002c093f05a6283661 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
On Thu, May 21, 2020 at 2:28 AM Les Ginsberg (ginsberg) <ginsberg@cisco.com> wrote:
<= blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-l= eft:1px solid rgb(204,204,204);padding-left:1ex">> * Update language? >
> There are several places in which it is possible that normative langua= ge in
> prior RFCs is revised. For example, in section 6.1, the last paragraph= states:
>
>=C2=A0 =C2=A0New applications which future documents define to make use= of the
>=C2=A0 =C2=A0advertisements defined in this document MUST NOT make use = of legacy
>=C2=A0 =C2=A0advertisements.
>
> This looks like it was written in such a way as to avoid requiring suc= h
> updates, but it would be good to confirm that there is no normative la= nguage
> in
> older documents that would conflict with this requirement.
>
[Les:] For applications which preexisted the writing of this draft (the one= s defined in Section 7.4) there are existing deployments which use legacy a= dvertisements.
Transitioning to use new advertisements has to account for partial deployme= nt of such support.
And the transition has to be managed by the network operator using knobs pr= ovided by implementations. This is onerous - but unavoidable in these cases= .

For new applications we want to avoid this complexity/pain. So we specify n= ew applications MUST use the new advertisements from day ONE.

As these are new applications there is no legacy to deal with and no existi= ng specification which would be in conflict.

That's wha= t I figured. Is it the case that new standardized applications require an R= FC? If so, I think this is fine.
=C2=A0
> * Encoding
>
> In section 4.1, the bit masks are defined with a 7 bit length field fo= r which
> only 4 bits are useful (values 0-8). It may make sense to keep the 3 h= igh order
> bits as "reserved" and set to zero, but either way it would = be nice to
> understand the justification for whatever design decision is made.
>
> You go to some length to save space (e.g., a zero-length SABM means &q= uot;all
> applications") but always include an octet for UDABM length, whic= h I
> presume
> will be zero outside the lab in most cases. How much does an extra oct= et
> cost?
> If it's a lot, you could use the three high-order bits to represen= t the first
> three applications (RSVP-TE, SRTE, and LFA) and save yourself an octet= until a
> fourth application appears.
>
> For that matter, how likely are you to get to 256 standardized applica= tions
> under IS-IS?
>
[Les:] The limitation for the xABM length to be no more than 8 bytes was in= troduced only recently based on a review comment.
The concern was that without a limit, it would be theoretically possible fo= r the ABM itself to consume the full sub-TLV space, leaving no room for the= actual link attribute advertisements.
So we placed a maximum length to avoid this potential issue.
As each application consumes one bit, with an 8 byte maximum length we can = support 64 applications.
Sigh... yes, math is hard.
<= span class=3D"gmail_default" style=3D"font-size:small">=C2=A0
<= blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-l= eft:1px solid rgb(204,204,204);padding-left:1ex"> This seems more than we will ever get to - but if anyone in the WG thinks t= his is not large enough they should speak now so we can increase the maximu= m.

I suspect even 64 is safely more than you'll need, b= ut if not there's always the possibility of a new TLV later on. :-)
=
=C2=A0
There are existing implementations of this draft which have been deployed. = Changing the bit positions as you suggested would not be backwards compatib= le.
I do not think the small space savings would be worth the trouble.

Understood, though I will point out that this illustrates the potential = harm in deploying something hard to change prior to standardization. Thankf= ully, IS-IS is not interdomain, meaning that any such change would impose c= osts only on those who deployed early.
> In effect, use of legacy advertisements vs. app-specific advertisement= s is
> all-or-nothing. If that's the case, wouldn't a top-level TLV s= pecifying a
> legacy mask for applications be more compact, less redundant, and furt= her
> reduce the overall number/size of advertisements?
>
[Les:] The information being advertised here (link attributes) is necessari= ly associated with a top level TLV describing a link to a neighbor (TLVs 22= , 23, 25, 141, 222, and 223) . Without that context the link attribute info= rmation is meaningless.

Yes, this makes sense, and probably= would have been obvious were I more familiar with IS-IS and link state rou= ting in general.
Thanks,
Ky= le

--0000000000002c093f05a6283661-- From nobody Thu May 21 06:09:35 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 4A73C3A0C7E; Thu, 21 May 2020 06:09:26 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.097 X-Spam-Level: X-Spam-Status: No, score=-2.097 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, HTML_MESSAGE=0.001, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=cooperw.in header.b=Nic2mG6G; dkim=pass (2048-bit key) header.d=messagingengine.com header.b=cacFP6QU Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id UpTx2pGuDeHj; Thu, 21 May 2020 06:09:20 -0700 (PDT) Received: from wout2-smtp.messagingengine.com (wout2-smtp.messagingengine.com [64.147.123.25]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 909103A0CFA; Thu, 21 May 2020 06:09:16 -0700 (PDT) Received: from compute4.internal (compute4.nyi.internal [10.202.2.44]) by mailout.west.internal (Postfix) with ESMTP id 0949E350; Thu, 21 May 2020 09:09:14 -0400 (EDT) Received: from mailfrontend2 ([10.202.2.163]) by compute4.internal (MEProxy); Thu, 21 May 2020 09:09:15 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=cooperw.in; h= from:message-id:content-type:mime-version:subject:date :in-reply-to:cc:to:references; s=fm3; bh=FWnhlQn7xBv7dVTKjB1kcsB MbrdwFJbLCrjm8FlkD9c=; b=Nic2mG6GSGooE7lpohdaziRP3qLkq/F1cSUuYrZ 2dKduLAJWM1MKdZxBkscAuYZ7aCexeo/bDbL+a+ymZU7ByNSFD0EdGJ6S8KgS9g8 qTytb2gFRpBI/Ju3DG/zzXl6W4VXPsGrp8KvwIcmirvD2yOFYdDeHwvp7FzQNvjP NGnInL/H9Xzksmh8jb+70asxwmnwvaspxlbTWRSfSGgPm0jAuIBzJkc82xQ/ZCtn KY568MUxEbBKC0KlvU9XqPnOLKkS6fMIimOLa/WvNQAoLP6zzwwg3ZHCdZsB8O7A dDgGCp2W1nAtNNfy7Ck5qA4CzzGUy/Q+ifQ5f/0WNDCgpow== DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d= messagingengine.com; h=cc:content-type:date:from:in-reply-to :message-id:mime-version:references:subject:to:x-me-proxy :x-me-proxy:x-me-sender:x-me-sender:x-sasl-enc; s=fm2; bh=FWnhlQ n7xBv7dVTKjB1kcsBMbrdwFJbLCrjm8FlkD9c=; b=cacFP6QU4F28NG1EjxajLH GIa+LkJLkmGBs6pdQJDk8x4UnMtsslDe4AB7mc+T4ikAXbt18uZHcTyYl7ykDC9B FwfUY+HzIt2np5qNUrBr76Jbt0aSJJ6Ud0rmVLUW7OaTFblGvGbEQjzaCdPl1HNY wF2CpNVRc5PpHAVoj0YV9tT4rLVv9RSAbz5v0F83iQ5m5LIzuDxvH60dpJLK4cpJ cI9zN9bk92GV0gY5abw5/eui9s+/GOSa1vLJAngcWUVcLTWtS6R0AuyGu0eCG9jD B5OlumHIcaqZBJvEA2ZlFhOh8d3DpVdxgHPuKO46xaKmhOvs4c2HzBo10+2DPTfw == X-ME-Sender: X-ME-Proxy-Cause: gggruggvucftvghtrhhoucdtuddrgeduhedrudduuddgheelucetufdoteggodetrfdotf fvucfrrhhofhhilhgvmecuhfgrshhtofgrihhlpdfqfgfvpdfurfetoffkrfgpnffqhgen uceurghilhhouhhtmecufedttdenucesvcftvggtihhpihgvnhhtshculddquddttddmne cujfgurhephffktgggufffjgfvfhfosegrtdhmrehhtddvnecuhfhrohhmpeetlhhishhs rgcuvehoohhpvghruceorghlihhsshgrsegtohhophgvrhifrdhinheqnecuggftrfgrth htvghrnhepleetkeehffekueeuudetvdeiudetvddtffehieegteejlefhtdetieffvddu ueetnecuffhomhgrihhnpehivghtfhdrohhrghenucfkphepuddtkedrhedurddutddurd elkeenucevlhhushhtvghrufhiiigvpedtnecurfgrrhgrmhepmhgrihhlfhhrohhmpegr lhhishhsrgestghoohhpvghrfidrihhn X-ME-Proxy: Received: from alcoop-m-c46z.fios-router.home (pool-108-51-101-98.washdc.fios.verizon.net [108.51.101.98]) by mail.messagingengine.com (Postfix) with ESMTPA id 1D1023066484; Thu, 21 May 2020 09:09:14 -0400 (EDT) From: Alissa Cooper Message-Id: <76BE667F-352A-4830-BF74-1EA9813EFC30@cooperw.in> Content-Type: multipart/alternative; boundary="Apple-Mail=_30FA3C22-417E-4CE2-AAE4-C740F8C917DE" Mime-Version: 1.0 (Mac OS X Mail 11.5 \(3445.9.5\)) Date: Thu, 21 May 2020 09:09:13 -0400 In-Reply-To: Cc: IESG , draft-ietf-ospf-mpls-elc@ietf.org, lsr-chairs@ietf.org, lsr@ietf.org, Acee Lindem , aretana.ietf@gmail.com To: Peter Psenak References: <159000466381.16821.994893511549433009@ietfa.amsl.com> X-Mailer: Apple Mail (2.3445.9.5) Archived-At: Subject: Re: [Lsr] Alissa Cooper's No Objection on draft-ietf-ospf-mpls-elc-13: (with COMMENT) X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 21 May 2020 13:09:33 -0000 --Apple-Mail=_30FA3C22-417E-4CE2-AAE4-C740F8C917DE Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=us-ascii Thanks! Alissa > On May 21, 2020, at 3:51 AM, Peter Psenak wrote: >=20 > Hi Alissa, >=20 > On 20/05/2020 21:57, Alissa Cooper via Datatracker wrote: >> Alissa Cooper has entered the following ballot position for >> draft-ietf-ospf-mpls-elc-13: No Objection >> When responding, please keep the subject line intact and reply to all >> email addresses included in the To and CC lines. (Feel free to cut = this >> introductory paragraph, however.) >> Please refer to = https://www.ietf.org/iesg/statement/discuss-criteria.html >> for more information about IESG DISCUSS and COMMENT positions. >> The document, along with other ballot positions, can be found here: >> https://datatracker.ietf.org/doc/draft-ietf-ospf-mpls-elc/ >> = ---------------------------------------------------------------------- >> COMMENT: >> = ---------------------------------------------------------------------- >> I wasn't clear on where the thread ended up from the Gen-ART review, = but I'm >> nevertheless suggesting some text below to resolve the main sticking = point. >> OLD >> If the router supports ELs on all of its interfaces, it SHOULD = advertise the >> ELC with every local host prefix it advertises in OSPF. >> NEW >> If the router supports ELs on all of its interfaces, it SHOULD = advertise the >> ELC with every local host prefix it advertises in OSPF. The absence = of these >> advertisements implies that advertisement of the ELC is not = supported. >=20 > I added the suggested text, plus I added "OSPF" at the end. So the = text is: >=20 > "If the router supports ELs on all of its interfaces, it SHOULD = advertise the ELC with every local host prefix it advertises in OSPF. = The absence of these advertisements implies that advertisement of the = ELC is not supported in OSPF." >=20 > I added similar text to ISIS ELC draft. >=20 > thanks, > Peter >=20 >> Not sure if that matches the intent though. --Apple-Mail=_30FA3C22-417E-4CE2-AAE4-C740F8C917DE Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=us-ascii Thanks!
Alissa

On May = 21, 2020, at 3:51 AM, Peter Psenak <ppsenak@cisco.com> = wrote:

Hi Alissa,

On 20/05/2020 21:57, Alissa = Cooper via Datatracker wrote:
Alissa Cooper has entered the = following ballot position for
draft-ietf-ospf-mpls-elc-13: = No Objection
When responding, please keep the subject line = intact and reply to all
email addresses included in the To = and CC lines. (Feel free to cut this
introductory = paragraph, however.)
Please refer to https://www.ietf.org/iesg/statement/discuss-criteria.htmlfor more information about IESG DISCUSS and COMMENT = positions.
The document, along with other ballot = positions, can be found here:
https://datatracker.ietf.org/doc/draft-ietf-ospf-mpls-elc/<= br = class=3D"">---------------------------------------------------------------= -------
COMMENT:
---------------------------------------------------------------= -------
I wasn't clear on where the  thread ended up = from the Gen-ART review, but I'm
nevertheless suggesting = some text below to resolve the main sticking point.
OLD
If the router supports ELs on all of its interfaces, it = SHOULD advertise the
ELC with every local host prefix it = advertises in OSPF.
NEW
If the router = supports ELs on all of its interfaces, it SHOULD advertise the
ELC with every local host prefix it advertises in OSPF. The = absence of these
advertisements implies that advertisement = of the ELC is not supported.

I added the suggested text, plus = I added "OSPF" at the end. So the text is:

"If the router supports ELs on all of its interfaces, it = SHOULD advertise the ELC with every local host prefix it advertises in = OSPF. The absence of these advertisements implies that advertisement of = the ELC is not supported in OSPF."

I added similar text to ISIS ELC draft.

thanks,
Peter

Not = sure if that matches the intent = though.

= --Apple-Mail=_30FA3C22-417E-4CE2-AAE4-C740F8C917DE-- From nobody Thu May 21 06:47:14 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id AD2203A0CD3 for ; Thu, 21 May 2020 06:47:12 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.097 X-Spam-Level: X-Spam-Status: No, score=-2.097 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=unavailable autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id gXnE6bcgHQ5W for ; Thu, 21 May 2020 06:47:10 -0700 (PDT) Received: from mail-il1-x12d.google.com (mail-il1-x12d.google.com [IPv6:2607:f8b0:4864:20::12d]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 291473A0CD9 for ; Thu, 21 May 2020 06:47:02 -0700 (PDT) Received: by mail-il1-x12d.google.com with SMTP id m6so7109976ilq.7 for ; Thu, 21 May 2020 06:47:02 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=wg4KyOXYgHJvunm6tpnp5QoQR825J7sHSa4zoz9wyt4=; b=SqfZatbYb/6T96vWu0jkZ+osdWtktMGdKti33bPUlVO9zjrgVozi/WPKqQJ/Z3gWvU DwUK8yHG8Mel7K86SMRzENxsyF8uZRiH9kejwWfPFA+ieGjaLB6jFubWj9XFMQxXEVXz lECDBJiy9xCOH2Qg7+74FdH1Zrr0AezF5b6e6q1I7Hm5mXaphkKN046OAoqPvzambcJ3 5Fq5eNxilW9OxNpm313PczVSQ/rGGvkz6gCD+GC1RdYG0Rmr2TE7zgZqWl7qKJ6VTdNL KAfPE6kH5i4q7MRtsM7znwyCynU9hfr5aw5YSsQpVdkrWOi4KcInW4Vv9bF7jBu6GXC/ 5ibw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=wg4KyOXYgHJvunm6tpnp5QoQR825J7sHSa4zoz9wyt4=; b=S3XTqDnJspnuwSuL9cGsLFGRjL2Ev9l+Bc3BGFsJ7AROwD6OYemd9UzwtYTa05c/ky uNweti2Mb0jc/xqRD0LTzWKOvmqJnAHE2nI0z2tSzl1/Fc1edqbmtbhGvvAp+ReV+1AD n225fNk2/3ksz2JobMPZd2BC6lAod2DvR4Vu68kh5zbGZ28yaY6uplv5tTOybLjyzYk/ HwoL0jszqM52UQ1r3VUfoivCbfF8tNwEdD1xyBlUwxTZp3cQVMawmenUjrorprh9C4PF nN6R5y997/x5tz45kAo+R5aE8heWrqQ1oWe5z2wAaKR0b5dGW3N6DlaDwcEhjQ5HBAdS U8TA== X-Gm-Message-State: AOAM530GG4UcHlIIAAmPWvCwRnVqhskfoCQZLp/NwEBFxvOatZrwRWk0 b5Qa1AAzG87xoH01CyTd4HUCKdsJ9+bv2RUTNJXNogCx X-Google-Smtp-Source: ABdhPJy/9LiKsFfiPwmdUz1mx8Y6pOFVza561Dn7GM7gzuQdPZ8IdJJHq3v/11uYGzSCUJaish8jh2GgofdbVEnx2p8= X-Received: by 2002:a92:3b8b:: with SMTP id n11mr8588127ilh.10.1590068822232; Thu, 21 May 2020 06:47:02 -0700 (PDT) MIME-Version: 1.0 References: <63330FD6-EDE8-4938-AA85-948279C57E34@cisco.com> In-Reply-To: <63330FD6-EDE8-4938-AA85-948279C57E34@cisco.com> From: Xufeng Liu Date: Thu, 21 May 2020 09:46:51 -0400 Message-ID: To: "Acee Lindem (acee)" Cc: "lsr@ietf.org" Content-Type: multipart/alternative; boundary="00000000000051524705a628bfcc" Archived-At: Subject: Re: [Lsr] Flooding Topology Computation Algorithm - draft-cc-lsr-flooding-reduction-08 Working Group Adoption Call X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 21 May 2020 13:47:13 -0000 --00000000000051524705a628bfcc Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Support as a co-author. Thanks, - Xufeng On Fri, May 15, 2020 at 3:40 PM Acee Lindem (acee) wrote: > This begins a 3 week (due to holidays) WG adoption call for the =E2=80=9C= Flooding > Topology Computation Algorithm=E2=80=9D draft. Please issue your support = or > objection to this list by 11:59 PM, UTC on June 5th, 2020. Here is a URL > for your convenience. > > > > https://datatracker.ietf.org/doc/draft-cc-lsr-flooding-reduction/ > > > > Thanks, > Acee > _______________________________________________ > Lsr mailing list > Lsr@ietf.org > https://www.ietf.org/mailman/listinfo/lsr > --00000000000051524705a628bfcc Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Support as a co-author= .
Thanks,
= - Xufeng

On Fri, May 15, 202= 0 at 3:40 PM Acee Lindem (acee) <acee=3D40cisco.com@dmarc.ietf.org> wrote:

This begins a 3 week = (due to holidays) WG adoption call for the =E2=80=9CFlooding Topology Compu= tation Algorithm=E2=80=9D draft. Please issue your support or objection to = this list by 11:59 PM, UTC on June 5th, 2020. Here is a URL for your convenience.

=C2=A0<= /span>

= https://datatracker.ietf.org/doc/draft-cc-lsr-flooding-reduction/

=C2=A0<= /span>

Thanks,
Acee

_______________________________________________
Lsr mailing list
Lsr@ietf.org
https://www.ietf.org/mailman/listinfo/lsr
--00000000000051524705a628bfcc-- From nobody Thu May 21 07:38:48 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id EC8903A0CFF for ; Thu, 21 May 2020 07:38:45 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.087 X-Spam-Level: X-Spam-Status: No, score=-2.087 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_REMOTE_IMAGE=0.01, URIBL_BLOCKED=0.001] autolearn=unavailable autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id b71LONN3ALSz for ; Thu, 21 May 2020 07:38:43 -0700 (PDT) Received: from mail-il1-x12b.google.com (mail-il1-x12b.google.com [IPv6:2607:f8b0:4864:20::12b]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 2B7053A0E26 for ; Thu, 21 May 2020 07:37:10 -0700 (PDT) Received: by mail-il1-x12b.google.com with SMTP id n11so7309554ilj.4 for ; Thu, 21 May 2020 07:37:10 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=ewTYSM0a6/TqMn+ZjHx5Lz6vPVYrx8/J9B3c9V+zRu0=; b=Dq0fYlWviaJyvzbR03cUBmob3HfMBJNo55VdLKLqa+4aPL2hK8XCxeo3T0GBNRkM4K jAOmgK9YfHjvRCL8zoPLmG0YMVzgFDH02ywqCAT+ktEx61bevQEoNfaE3xQDFbyHjBSG 5EY+5OapmWJ8S0Qmj3+38x8bGem4/POB2K9vxNyH5N28NOwmwNn11NYu1qzAh7Xr7kst nPxHfUK/qoM0vyAq55RH/pJemFGHykb5TgYcEs3+WzXKjTe4NgPIizasanWndiwx0mpX LL/Om8LXWyE4bIH9jyiTaj/sqpOUprPQ4UVmLCBsn8oe3yOdQrZ9JOM2bhvNPeHtiXqe c7pg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=ewTYSM0a6/TqMn+ZjHx5Lz6vPVYrx8/J9B3c9V+zRu0=; b=QtOXYwUTOhd0Z1SQgqVpY6LPJYTlFGH2SSzP9inmn3FzUqcAMScRt4DtGRj/9uCusK HMzTid6iF44xZCPxT4uDDFxXy54gq1A9bcVBoo47qn6gD7UCtf4DLwlqiN07InA1dnCW kL8l1hHVZChxfqfkWukwxMmgYpINkeUca7pdaiDmmLdzwkaMbKNfzygBVNaUGK04nYsx ulkRwQkmVxKiq4pgmJcUoq7ezymhhEWSeuoBVsaPWIjTbMgGJD+tEbtpzPttdJ0LmiVk YJyLPdxf6xG48LtT2FjUUw+ljW56B+5TZfguo901R9AAbp/1t+yjCIcLol5uhz/TUq71 QGVg== X-Gm-Message-State: AOAM5332rVzK1v1jNwizCob2kf+yfL9kUHDdColEyG4ukUoX5sy5pWDB a4oSAO/3+DvlxzaTM/agLr7eV38s1v3+njRc2quZRm5j6LY= X-Google-Smtp-Source: ABdhPJz+T5nVw8QwVMmH3MwsWhWX/fa2Mzm529PlOP91Fy0kVvX/APEkcEpWAi9ALMmwbGsToJl566KMo7CH89UXcmA= X-Received: by 2002:a92:400e:: with SMTP id n14mr9073406ila.300.1590071829220; Thu, 21 May 2020 07:37:09 -0700 (PDT) MIME-Version: 1.0 References: <63330FD6-EDE8-4938-AA85-948279C57E34@cisco.com> In-Reply-To: From: Gyan Mishra Date: Thu, 21 May 2020 10:36:58 -0400 Message-ID: To: Huaimo Chen Cc: "Acee Lindem (acee)" , "lsr@ietf.org" Content-Type: multipart/alternative; boundary="0000000000008c52a305a62972c5" Archived-At: Subject: Re: [Lsr] Flooding Topology Computation Algorithm - draft-cc-lsr-flooding-reduction-08 Working Group Adoption Call X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 21 May 2020 14:38:46 -0000 --0000000000008c52a305a62972c5 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Wed, May 20, 2020 at 11:59 PM Huaimo Chen wrote: > Hi Gyan, > > Thanks much for your questions. My answers are inline below with [HC]= . > > Best Regards, > Huaimo > ------------------------------ > *From:* Gyan Mishra > *Sent:* Wednesday, May 20, 2020 11:14 AM > *To:* Huaimo Chen > *Cc:* Acee Lindem (acee) ; lsr@ietf.or= g < > lsr@ietf.org> > *Subject:* Re: [Lsr] Flooding Topology Computation Algorithm - > draft-cc-lsr-flooding-reduction-08 Working Group Adoption Call > > Huaimo > > This is a much needed feature that operators have been needing for densel= y > meshed topologies that commonly exist in data centers to accommodate very > high bandwidth E-W traffic. > [HC]: Thank you very much. > > Below is link from Cisco which has introduced feature for dynamic floodin= g > in clos high density ECMP data center topologies. > > Please look at the feature description and it does seem to be exactly the > same as this draft. Please confirm. > [HC]: It seems different. > > There maybe other vendors due to industry demand have to get the feature > deployed before it reaches standards vendor consensus with the IETF. > > > https://www.cisco.com/c/en/us/products/collateral/switches/nexus-9000-ser= ies-switches/white-paper-c11-743015.html > > > We are testing this feature and planning to deploy but wanted to ensure > that this is the same as the draft on the standards track. > [HC]: The feature appears implemented draft "Dynamic Flooding on Dense > Graphs", which does not include any flooding topology computation > algorithm. > Gyan> How does this draft compare to the WG LC draft for flood reduction. Would they be two eventual standard options in the operators toolbox or competing features for optimized flood reduction. Would having two flood reduction features standardized versus one default IGP flood reduction feature be confusing for operators. Just as it was confusing to me. https://datatracker.ietf.org/doc/draft-ietf-lsr-dynamic-flooding/ > > Kind regards > > Gyan > > > On Tue, May 19, 2020 at 11:52 PM Huaimo Chen > wrote: > > Hi Gyan, > > Thank you very much for your questions and support. > > This Flooding Topology Computation algorithm can be used in the Dynam= ic > Flooding on Dense Graphs to compute the flooding topologies for the data > center clos dense meshed topologies with many ECMP paths. It can be used = by > the area leader in the centralized mode to compute the flooding topology. > > Best Regards, > Huaimo > ------------------------------ > *From:* Lsr on behalf of Gyan Mishra < > hayabusagsm@gmail.com> > *Sent:* Tuesday, May 19, 2020 2:39 AM > *To:* Yanhe Fan > *Cc:* lsr@ietf.org ; Acee Lindem (acee) 40cisco.com@dmarc.ietf.org> > *Subject:* Re: [Lsr] Flooding Topology Computation Algorithm - > draft-cc-lsr-flooding-reduction-08 Working Group Adoption Call > > > I support WG adoption and have a few questions related to the draft. > > Does this flooding algorithm use the dynamic flooding algorithm used in > data center clos dense meshed topologies with many ECMP paths where the > flood is decoupled from the physical topology. In the dynamic flooding > algorithm mentioned in centralized mode the flooding is computed by the > area leader and distributed to all nodes. In distributed mode each mode > the area leader determines the algorithm and then each node computes the > flooding topology based on the algorithm. > > This dynamic algorithm for optimized flood reduction would reduce the > amount of redundant flooding in highly densely meshed ospf or Isis > topologies. So this optimization of flooding would improving overall lin= k > state routing protocol convergence. > > Gyan > > On Mon, May 18, 2020 at 3:37 PM Yanhe Fan wrote: > > Support it as a co-author. > > > > Thanks, > > Yanhe > > > > *From:* Lsr *On Behalf Of *Acee Lindem (acee) > *Sent:* Friday, May 15, 2020 3:40 PM > *To:* lsr@ietf.org > *Subject:* [Lsr] Flooding Topology Computation Algorithm - > draft-cc-lsr-flooding-reduction-08 Working Group Adoption Call > > > > This begins a 3 week (due to holidays) WG adoption call for the =E2=80=9C= Flooding > Topology Computation Algorithm=E2=80=9D draft. Please issue your support = or > objection to this list by 11:59 PM, UTC on June 5th, 2020. Here is a URL > for your convenience. > > > > https://datatracker.ietf.org/doc/draft-cc-lsr-flooding-reduction/ > > > > > Thanks, > Acee > _______________________________________________ > Lsr mailing list > Lsr@ietf.org > https://www.ietf.org/mailman/listinfo/lsr > > > -- > > > > > > > > *Gyan > Mishra* > > *Network Solutions A**rchitect * > > > > *M 301 502-1347 13101 Columbia Pike > > *Silver Spring, MD > > > -- > > > > > *Gyan Mishra* > > > > *Network Solutions A**rchitect * > > > > *M 301 502-1347 13101 Columbia Pike > > *Silver Spring, MD > > > -- *Gyan Mishra* *Network Solutions A**rchitect * *M 301 502-134713101 Columbia Pike *Silver Spring, MD --0000000000008c52a305a62972c5 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable


On Wed, May 20, 2020 at 11:59 PM Huaimo Chen <huaimo.chen@futurewei.com> wrote:=
Hi Gyan,

=C2=A0 =C2=A0 Thanks much for your questions. My answers are inline below w= ith [HC].

Best Regards,
Huaimo
From:= Gyan Mishra <hayabusagsm@gmail.com>
Sent: Wednesday, May 20, 2020 11:14 AM
To: Huaimo Chen <huaimo.chen@futurewei.com>
Cc: Acee Lindem (acee) <acee=3D40cisco.com@dmarc.ietf.org>; lsr@ietf.org <lsr@ietf.org>
Subject: Re: [Lsr] Flooding Topology Computation Algorithm - draft-c= c-lsr-flooding-reduction-08 Working Group Adoption Call
=C2=A0
Huaimo=C2=A0

This is a much needed feature that operators have been ne= eding for densely meshed topologies that commonly exist in data centers to = accommodate very high bandwidth E-W traffic.
[HC]: Thank you very much.

Below is link from Cisco which has introduced feature for= dynamic flooding in clos high density ECMP data center topologies.

Please look at the feature description and it does seem t= o be exactly the same as this draft.=C2=A0 Please confirm.=C2=A0
[HC]: It seems different.=C2=A0

There maybe other vendors due to industry demand have to = get the feature deployed before it reaches standards vendor consensus with = the IETF.


We are testing this feature and planning to deploy but wa= nted to ensure that this is the same as the draft on the standards track.
[HC]: The feature appears implemented draft "Dynamic Flooding on Dense Graph= s", which does not include any flooding topology computation algorithm= .=C2=A0
=
=C2=A0 =C2=A0 Gyan> How does this draft comp= are to the WG LC draft for flood reduction.=C2=A0 Would they be two eventua= l standard options in the operators toolbox =C2=A0or competing features for= optimized flood reduction. Would having two flood reduction features stand= ardized versus one default IGP flood reduction feature be confusing for ope= rators.=C2=A0 Just as it was confusing to me.


Kind regards=C2=A0

Gyan


On Tue, May 19, 2020 at 11:52 PM Huaimo Chen <huaimo.chen@futurew= ei.com> wrote:
Hi Gy= an,

=C2= =A0 =C2=A0 Thank you very much for your questions and support.

=C2= =A0 =C2=A0 This Flooding Topology Computation algorithm can be used in the Dynamic Flooding on Dense Graphs to compute the flooding topologies for the=C2=A0d= ata center clos dense meshed topologies with many ECMP paths. It can be use= d by the area leader in the centralized mode to compute the flooding topolo= gy. =C2=A0=C2=A0

Best = Regards,
Huaim= o
From: Lsr <lsr-bounces@ietf.org<= /a>> on behalf of Gyan Mishra <hayabusagsm@gmail.co= m>
Sent: Tuesday, May 19, 2020= 2:39 AM
To: Yanhe Fan <yfan@casa-systems.com>
Cc: lsr@ietf.org <lsr@ietf.org>; Acee Lindem (ace= e) <acee=3D40cisco.com@dmarc.ietf.org&= gt;
Subject: Re: [Lsr] Flooding= Topology Computation Algorithm - draft-cc-lsr-flooding-reduction-08 Workin= g Group Adoption Call
=C2=A0

I support WG adoption and have a few questions related to= the draft.

Does this flooding algorithm use the dynamic flooding alg= orithm used in data center clos dense meshed topologies with many ECMP path= s where the flood is decoupled from the physical topology.=C2=A0 In the dyn= amic flooding algorithm mentioned in centralized mode the flooding is computed by the area leader and distributed to all no= des.=C2=A0 In distributed mode each mode the area leader determines the alg= orithm and then each node computes the flooding topology based on the algor= ithm. =C2=A0

This dynamic algorithm for optimized flood reduction woul= d reduce the amount of redundant flooding in highly densely meshed ospf or = Isis topologies.=C2=A0 So this optimization of flooding would improving ove= rall link state routing protocol convergence.

Gyan=C2=A0

On Mon, May 18, 2020 at 3:37 PM Yanhe Fan <yfan@casa-systems.com>= ; wrote:

Support it as a co-author.<= /span>

=C2=A0

Thanks,

Yanhe

_______________________________________________
Lsr mailing list
Lsr@ietf.org
https://www.ietf.org/mailman/listinfo/lsr
--


<= /a>

Gy= an Mishra

Network Solutions Architect=C2=A0

M 301 502-1347
13101 Columbia Pike=C2=A0
Silver Spring, MD


--


Gyan Mishra

Network Solution= s Architect= =C2=A0

M 301 502-1347
13101 Columbia Pike=C2=A0=
Silver Spring, MD<= /a>


--
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May 2020 15:01:48 +0000 From: Huaimo Chen To: Gyan Mishra CC: "Acee Lindem (acee)" , "lsr@ietf.org" Thread-Topic: [Lsr] Flooding Topology Computation Algorithm - draft-cc-lsr-flooding-reduction-08 Working Group Adoption Call Thread-Index: AQHWKvCWbO+rNwui80Sty0q3wo/aI6iuQDRQgAC6fICAAVrmiIAAx0uAgADIYX+AAL9sAIAAAVea Date: Thu, 21 May 2020 15:01:48 +0000 Message-ID: References: <63330FD6-EDE8-4938-AA85-948279C57E34@cisco.com> , In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: gmail.com; dkim=none (message not signed) header.d=none;gmail.com; dmarc=none action=none header.from=futurewei.com; x-originating-ip: [73.114.233.24] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: 5a13691e-a70e-44b1-f01a-08d7fd97e312 x-ms-traffictypediagnostic: MN2PR13MB3904: x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:9508; x-forefront-prvs: 041032FF37 x-ms-exchange-senderadcheck: 1 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0fee8ff2-a3b2-4018-9c75-3a1d5591fedc X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: mod4E7GnTGYcIIb9NM8c3Vj+2E3hTxNzu4LK0ofHLH5qUn220Qhjl86uS1WixfPVmLToCECNOk9QLSpgbiX89g== X-MS-Exchange-Transport-CrossTenantHeadersStamped: MN2PR13MB3904 Archived-At: Subject: Re: [Lsr] Flooding Topology Computation Algorithm - draft-cc-lsr-flooding-reduction-08 Working Group Adoption Call X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 21 May 2020 15:01:55 -0000 --_000_MN2PR13MB3117A5E68B341A203266C64AF2B70MN2PR13MB3117namp_ Content-Type: text/plain; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable Hi Gyan, Thanks much for your questions. Gyan> How does this draft compare to the WG LC draft for flood reduction. = Would they be two eventual standard options in the operators toolbox or c= ompeting features for optimized flood reduction. Would having two flood red= uction features standardized versus one default IGP flood reduction feature= be confusing for operators. Just as it was confusing to me. https://datatracker.ietf.org/doc/draft-ietf-lsr-dynamic-flooding/ [HC]: This draft plus the draft for flooding reduction can provide two = modes of flooding reductions (i.e., centralized mode and distributed mode).= The latter describes the two modes, but does not include any flooding topo= logy computation algorithm for the distributed mode. The former proposes a = flooding topology computation algorithm to be used in the distributed mode. Best Regards, Huaimo ________________________________ From: Gyan Mishra Sent: Thursday, May 21, 2020 10:36 AM To: Huaimo Chen Cc: Acee Lindem (acee) ; lsr@ietf.org Subject: Re: [Lsr] Flooding Topology Computation Algorithm - draft-cc-lsr-f= looding-reduction-08 Working Group Adoption Call On Wed, May 20, 2020 at 11:59 PM Huaimo Chen > wrote: Hi Gyan, Thanks much for your questions. My answers are inline below with [HC]. Best Regards, Huaimo ________________________________ From: Gyan Mishra > Sent: Wednesday, May 20, 2020 11:14 AM To: Huaimo Chen > Cc: Acee Lindem (acee) >; lsr@ietf.org > Subject: Re: [Lsr] Flooding Topology Computation Algorithm - draft-cc-lsr-f= looding-reduction-08 Working Group Adoption Call Huaimo This is a much needed feature that operators have been needing for densely = meshed topologies that commonly exist in data centers to accommodate very h= igh bandwidth E-W traffic. [HC]: Thank you very much. Below is link from Cisco which has introduced feature for dynamic flooding = in clos high density ECMP data center topologies. Please look at the feature description and it does seem to be exactly the s= ame as this draft. Please confirm. [HC]: It seems different. There maybe other vendors due to industry demand have to get the feature de= ployed before it reaches standards vendor consensus with the IETF. https://www.cisco.com/c/en/us/products/collateral/switches/nexus-9000-serie= s-switches/white-paper-c11-743015.html We are testing this feature and planning to deploy but wanted to ensure tha= t this is the same as the draft on the standards track. [HC]: The feature appears implemented draft "Dynamic Flooding on Dense Grap= hs", which does not include any flooding topology computation algorithm. Gyan> How does this draft compare to the WG LC draft for flood reductio= n. Would they be two eventual standard options in the operators toolbox o= r competing features for optimized flood reduction. Would having two flood = reduction features standardized versus one default IGP flood reduction feat= ure be confusing for operators. Just as it was confusing to me. https://datatracker.ietf.org/doc/draft-ietf-lsr-dynamic-flooding/ Kind regards Gyan On Tue, May 19, 2020 at 11:52 PM Huaimo Chen > wrote: Hi Gyan, Thank you very much for your questions and support. This Flooding Topology Computation algorithm can be used in the Dynamic= Flooding on Dense Graphs to compute the flooding topologies for the data c= enter clos dense meshed topologies with many ECMP paths. It can be used by = the area leader in the centralized mode to compute the flooding topology. Best Regards, Huaimo ________________________________ From: Lsr > on behalf of = Gyan Mishra > Sent: Tuesday, May 19, 2020 2:39 AM To: Yanhe Fan > Cc: lsr@ietf.org >; = Acee Lindem (acee) > Subject: Re: [Lsr] Flooding Topology Computation Algorithm - draft-cc-lsr-f= looding-reduction-08 Working Group Adoption Call I support WG adoption and have a few questions related to the draft. Does this flooding algorithm use the dynamic flooding algorithm used in dat= a center clos dense meshed topologies with many ECMP paths where the flood = is decoupled from the physical topology. In the dynamic flooding algorithm= mentioned in centralized mode the flooding is computed by the area leader = and distributed to all nodes. In distributed mode each mode the area leade= r determines the algorithm and then each node computes the flooding topolog= y based on the algorithm. This dynamic algorithm for optimized flood reduction would reduce the amoun= t of redundant flooding in highly densely meshed ospf or Isis topologies. = So this optimization of flooding would improving overall link state routing= protocol convergence. Gyan On Mon, May 18, 2020 at 3:37 PM Yanhe Fan > wrote: Support it as a co-author. Thanks, Yanhe From: Lsr > On Behalf Of = Acee Lindem (acee) Sent: Friday, May 15, 2020 3:40 PM To: lsr@ietf.org Subject: [Lsr] Flooding Topology Computation Algorithm - draft-cc-lsr-flood= ing-reduction-08 Working Group Adoption Call This begins a 3 week (due to holidays) WG adoption call for the =93Flooding= Topology Computation Algorithm=94 draft. Please issue your support or obje= ction to this list by 11:59 PM, UTC on June 5th, 2020. Here is a URL for yo= ur convenience. https://datatracker.ietf.org/doc/draft-cc-lsr-flooding-reduction/ Thanks, Acee _______________________________________________ Lsr mailing list Lsr@ietf.org https://www.ietf.org/mailman/listinfo/lsr -- [http://ss7.vzw.com/is/image/VerizonWireless/vz-logo-email] Gyan Mishra Network Solutions Architect M 301 502-1347 13101 Columbia Pike Silver Spring, MD -- [http://ss7.vzw.com/is/image/VerizonWireless/vz-logo-email] Gyan Mishra Network Solutions Architect M 301 502-1347 13101 Columbia Pike Silver Spring, MD -- [http://ss7.vzw.com/is/image/VerizonWireless/vz-logo-email] Gyan Mishra Network Solutions Architect M 301 502-1347 13101 Columbia Pike Silver Spring, MD --_000_MN2PR13MB3117A5E68B341A203266C64AF2B70MN2PR13MB3117namp_ Content-Type: text/html; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable
Hi Gyan,

    Thanks much for your questions.
    [HC]: This draft plus the draft for flooding reduction can pr= ovide two modes of flooding reductions (i.e., centralized mode and distribu= ted mode). The latter describes the two modes, but does not include any flo= oding topology computation algorithm for the distributed mode. The former proposes a flooding topology computation algorithm to be = used in the distributed mode.  

Best Regards,
Huaimo
From: Gyan Mishra <hayab= usagsm@gmail.com>
Sent: Thursday, May 21, 2020 10:36 AM
To: Huaimo Chen <huaimo.chen@futurewei.com>
Cc: Acee Lindem (acee) <acee=3D40cisco.com@dmarc.ietf.org>; ls= r@ietf.org <lsr@ietf.org>
Subject: Re: [Lsr] Flooding Topology Computation Algorithm - draft-c= c-lsr-flooding-reduction-08 Working Group Adoption Call
 


On Wed, May 20, 2020 at 11:59 PM Hu= aimo Chen <huaimo.chen@futu= rewei.com> wrote:
Hi Gyan,

    Thanks much for your questions. My answers are inline below w= ith [HC].

Best Regards,
Huaimo
From: Gyan Mishra <hayabusagsm@gmail.com>
Sent: Wednesday, May 20, 2020 11:14 AM
To: Huaimo Chen <huaimo.chen@futurewei.com>
Cc: Acee Lindem (acee) <acee=3D40cisco.com@dmarc.ietf.org>; lsr@ietf.org <lsr@ietf.org>
Subject: Re: [Lsr] Flooding Topology Computation Algorithm - draft-c= c-lsr-flooding-reduction-08 Working Group Adoption Call
 
Huaimo 

This is a much needed feature that operators have been ne= eding for densely meshed topologies that commonly exist in data centers to = accommodate very high bandwidth E-W traffic.
[HC]: Thank you very much.

Below is link from Cisco which has introduced feature for= dynamic flooding in clos high density ECMP data center topologies.

Please look at the feature description and it does seem t= o be exactly the same as this draft.  Please confirm. 
[HC]: It seems different. 

There maybe other vendors due to industry demand have to = get the feature deployed before it reaches standards vendor consensus with = the IETF.


We are testing this feature and planning to deploy but wa= nted to ensure that this is the same as the draft on the standards track.
[HC]: The feature appears implemented draft "Dynamic Flooding on Dense Graph= s", which does not include any flooding topology computation algorithm= . 

    Gyan> How does this draft compare to the= WG LC draft for flood reduction.  Would they be two eventual standard= options in the operators toolbox  or competing features for optimized= flood reduction. Would having two flood reduction features standardized versus one default IGP flood reduction feature be confusing f= or operators.  Just as it was confusing to me.


Kind regards 

Gyan


On Tue, May 19, 2020 at 11:52 PM Huaimo Chen <huaimo.chen@futurew= ei.com> wrote:
Hi G= yan,

&nbs= p;   Thank you very much for your questions and support.

&nbs= p;   This Flooding Topology Computation algorithm can be used in the Dynamic Flooding on Dense Graphs to compute the flooding topologies for the d= ata center clos dense meshed topologies with many ECMP paths. It can be use= d by the area leader in the centralized mode to compute the flooding topolo= gy.   

Best= Regards,
Huai= mo
From: Lsr <lsr-bounces@ietf.org> on behalf of Gyan Mishra <hayabusagsm@gmail.co= m>
Sent: Tuesday, May 19, 2020= 2:39 AM
To: Yanhe Fan <yfan@casa-systems.com>
Cc: lsr@ietf.org <lsr@ietf.org>; Acee Lindem (ace= e) <acee=3D40cisco.com@dmarc.ietf.org&= gt;
Subject: Re: [Lsr] Flooding= Topology Computation Algorithm - draft-cc-lsr-flooding-reduction-08 Workin= g Group Adoption Call
 

I support WG adoption and have a few questions related to= the draft.

Does this flooding algorithm use the dynamic flooding alg= orithm used in data center clos dense meshed topologies with many ECMP path= s where the flood is decoupled from the physical topology.  In the dyn= amic flooding algorithm mentioned in centralized mode the flooding is computed by the area leader and distributed to all no= des.  In distributed mode each mode the area leader determines the alg= orithm and then each node computes the flooding topology based on the algor= ithm.  

This dynamic algorithm for optimized flood reduction woul= d reduce the amount of redundant flooding in highly densely meshed ospf or = Isis topologies.  So this optimization of flooding would improving ove= rall link state routing protocol convergence.

Gyan 

On Mon, May 18, 2020 at 3:37 PM Yanhe Fan <yfan@casa-systems.com>= ; wrote:

Support it as a co-author.<= /span>

 

Thanks,

Yanhe

_______________________________________________
Lsr mailing list
Lsr@ietf.org
https://www.ietf.org/mailman/listinfo/lsr=
--


Gyan Mishra

Network Solutions Architect 

M 301 502-1347
13101 Columbia Pike 
Silver Spring, MD


--


Gyan Mishra

Network Solutio= ns Architect&= nbsp;

M 301 502-1347
13101 Columbia Pike 
Silver Spring, MD


--

=

Gyan Mishra

Network Solutio= ns Architect&= nbsp;

M 301 502-1347
13101 Columbia Pike 
Silver Spring, MD


--_000_MN2PR13MB3117A5E68B341A203266C64AF2B70MN2PR13MB3117namp_-- From nobody Thu May 21 09:55:20 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 8EBAE3A09DE; Thu, 21 May 2020 09:55:18 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -9.601 X-Spam-Level: X-Spam-Status: No, score=-9.601 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIMWL_WL_MED=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, SPF_PASS=-0.001, URIBL_BLOCKED=0.001, USER_IN_DEF_DKIM_WL=-7.5] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=cisco.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id HOutKeveBgGs; Thu, 21 May 2020 09:55:16 -0700 (PDT) Received: from aer-iport-4.cisco.com (aer-iport-4.cisco.com [173.38.203.54]) (using TLSv1.2 with cipher DHE-RSA-SEED-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id E11C13A08C5; Thu, 21 May 2020 09:55:15 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=2546; q=dns/txt; s=iport; t=1590080116; x=1591289716; h=subject:to:cc:references:from:message-id:date: mime-version:in-reply-to:content-transfer-encoding; bh=ACjsqB8hQQPyvgpKbmMC0Aa9ez7bz0t+kJLkIruC/i0=; b=VMn6aVfkw5Hprl9UW7gNyLtA5LFtvzjCCk/WIdwOlekvyW5mptyZsfIE hJ4U2m7gzd2iP3SByqr12OP7F3GlTuepFF7i2OIfEcnxnXVk7H47/qLKs xFQUUjCYn2bZpzmstgZhPC2xGFYpxc0dIitrTSujqhXlqwld67uuAC9Kr M=; X-IronPort-AV: E=Sophos;i="5.73,418,1583193600"; d="scan'208";a="26359243" Received: from aer-iport-nat.cisco.com (HELO aer-core-1.cisco.com) ([173.38.203.22]) by aer-iport-4.cisco.com with ESMTP/TLS/DHE-RSA-SEED-SHA; 21 May 2020 16:55:14 +0000 Received: from [10.60.140.51] (ams-ppsenak-nitro2.cisco.com [10.60.140.51]) by aer-core-1.cisco.com (8.15.2/8.15.2) with ESMTP id 04LGtD8N028297; Thu, 21 May 2020 16:55:13 GMT To: Alissa Cooper Cc: IESG , draft-ietf-ospf-mpls-elc@ietf.org, lsr-chairs@ietf.org, lsr@ietf.org, Acee Lindem , aretana.ietf@gmail.com References: <159000466381.16821.994893511549433009@ietfa.amsl.com> <76BE667F-352A-4830-BF74-1EA9813EFC30@cooperw.in> From: Peter Psenak Message-ID: <93bc68cd-7721-dae6-2173-513f5c854ec2@cisco.com> Date: Thu, 21 May 2020 18:55:13 +0200 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:60.0) Gecko/20100101 Thunderbird/60.7.0 MIME-Version: 1.0 In-Reply-To: <76BE667F-352A-4830-BF74-1EA9813EFC30@cooperw.in> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit X-Outbound-SMTP-Client: 10.60.140.51, ams-ppsenak-nitro2.cisco.com X-Outbound-Node: aer-core-1.cisco.com Archived-At: Subject: Re: [Lsr] Alissa Cooper's No Objection on draft-ietf-ospf-mpls-elc-13: (with COMMENT)ret, . X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 21 May 2020 16:55:19 -0000 Alissa, as Les correctly pointed out privately to me, this updated text is not entirely correct. Not advertising the ELC bit can be result of: a) router not supporting this extension b) router supporting this extension, but not supporting ELC So I would rather keep the original text unchanged. This is not anything new. This ambiguity is common for any new protocol extension that signals a boolean type of information. thanks, Peter On 21/05/2020 15:09, Alissa Cooper wrote: > Thanks! > Alissa > >> On May 21, 2020, at 3:51 AM, Peter Psenak > > wrote: >> >> Hi Alissa, >> >> On 20/05/2020 21:57, Alissa Cooper via Datatracker wrote: >>> Alissa Cooper has entered the following ballot position for >>> draft-ietf-ospf-mpls-elc-13: No Objection >>> When responding, please keep the subject line intact and reply to all >>> email addresses included in the To and CC lines. (Feel free to cut this >>> introductory paragraph, however.) >>> Please refer to https://www.ietf.org/iesg/statement/discuss-criteria.html >>> for more information about IESG DISCUSS and COMMENT positions. >>> The document, along with other ballot positions, can be found here: >>> https://datatracker.ietf.org/doc/draft-ietf-ospf-mpls-elc/ >>> ---------------------------------------------------------------------- >>> COMMENT: >>> ---------------------------------------------------------------------- >>> I wasn't clear on where the  thread ended up from the Gen-ART review, >>> but I'm >>> nevertheless suggesting some text below to resolve the main sticking >>> point. >>> OLD >>> If the router supports ELs on all of its interfaces, it SHOULD >>> advertise the >>> ELC with every local host prefix it advertises in OSPF. >>> NEW >>> If the router supports ELs on all of its interfaces, it SHOULD >>> advertise the >>> ELC with every local host prefix it advertises in OSPF. The absence >>> of these >>> advertisements implies that advertisement of the ELC is not supported. >> >> I added the suggested text, plus I added "OSPF" at the end. So the >> text is: >> >> "If the router supports ELs on all of its interfaces, it SHOULD >> advertise the ELC with every local host prefix it advertises in OSPF. >> The absence of these advertisements implies that advertisement of the >> ELC is not supported in OSPF." >> >> I added similar text to ISIS ELC draft. >> >> thanks, >> Peter >> >>> Not sure if that matches the intent though. > From nobody Thu May 21 10:51:24 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id EAC1F3A0AD9 for ; Thu, 21 May 2020 10:51:21 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.076 X-Spam-Level: X-Spam-Status: No, score=-2.076 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_FONT_LOW_CONTRAST=0.001, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_KAM_HTML_FONT_INVALID=0.01, T_REMOTE_IMAGE=0.01, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id wbkra9n9jlTh for ; Thu, 21 May 2020 10:51:19 -0700 (PDT) Received: from mail-il1-x12f.google.com (mail-il1-x12f.google.com [IPv6:2607:f8b0:4864:20::12f]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 3A07C3A0AF4 for ; Thu, 21 May 2020 10:51:19 -0700 (PDT) Received: by mail-il1-x12f.google.com with SMTP id n11so7976991ilj.4 for ; Thu, 21 May 2020 10:51:19 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=09r4YgubT5N+gQ/YyIwgoIwz9EPMPPN6b5iY8CI0/WU=; b=rY92znueKqWmwdbfAYOpkr2v7OzsZsiiM4tfCjKweTBJx3o1T/xn/15zBTDPS1KFuJ 82PSYCGakjgx1heMFpAuM4T9+Abl9f+dRsZbii00ew3oW/TOBYpD69INsd1f45vh7kaD QNIBw+xdh8gayJoTJZ71TCNqSzo5FME+TRNcI7Ux3HqwDRbTOTikn4Ya5MI8KTkdJOnt o8qO2XnwJDdD3HM611qACK8gJimGTGP03vxdGEop6FCh4Lvb1aO/OwCbiW5PkULmTGRf hUarXr99IcxA6O+3ZTXbh4jfZVKi/WuFIoRf22SBqpq1Pihu5FmYKprjNaRGI+wdZHli lOTg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=09r4YgubT5N+gQ/YyIwgoIwz9EPMPPN6b5iY8CI0/WU=; b=kbeKao5crd0DJbG0sC/342TjDZm94/74eftpeDFoX96ui47+YVtkKG0LEAuTQ0PqoO I3hDOWDQBfBm0hVoAqmrw6nuEhQgN3qA2HaXWt23utsUMDuStgeaFyS3AhEjLYjBi7g+ iwnW/88e4yuj2dOOldYooDSeZMq/eLjiXJ4pHPjSjhb3RvvQGk2hcCJBMneVZbbKmhve HWrdWKRo3f35VVxHZsN4uaCiGaj2DlUFo6hxpXPdLpztTlJyUdp3Dvd2Lhx1L7cDYR2d XPJOqJkr6qOJv0OvB8GxlWn1tca76peoX70Nd0OQZdeWnwA7uh5eWlcUaeqfB0ofq/Dg /1Bw== X-Gm-Message-State: AOAM532Lw4KffU8fFKjQZ3qOapAPtVsxafFMirmzbGoDlP5ip7TEzAzx 9ChqWwPVmV/yXnIoxoMx2po9uknHlCS5DWtiRZA= X-Google-Smtp-Source: ABdhPJzKUhQKoKZR9h5NE3beZcdOcVGkJP6+05dGWgnATpVeKptcd9oYiHDKMFqGBJ1tk8x9Hp0IsW3mgvk/j7f4qys= X-Received: by 2002:a92:c948:: with SMTP id i8mr9906600ilq.258.1590083478165; Thu, 21 May 2020 10:51:18 -0700 (PDT) MIME-Version: 1.0 References: <63330FD6-EDE8-4938-AA85-948279C57E34@cisco.com> In-Reply-To: From: Gyan Mishra Date: Thu, 21 May 2020 13:51:07 -0400 Message-ID: To: Huaimo Chen Cc: "Acee Lindem (acee)" , "lsr@ietf.org" Content-Type: multipart/alternative; boundary="000000000000e11c3b05a62c287b" Archived-At: Subject: Re: [Lsr] Flooding Topology Computation Algorithm - draft-cc-lsr-flooding-reduction-08 Working Group Adoption Call X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 21 May 2020 17:51:22 -0000 --000000000000e11c3b05a62c287b Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Thu, May 21, 2020 at 11:01 AM Huaimo Chen wrote: > Hi Gyan, > > Thanks much for your questions. > > Gyan> How does this draft compare to the WG LC draft for flood > reduction. Would they be two eventual standard options in the operators > toolbox or competing features for optimized flood reduction. Would havin= g > two flood reduction features standardized versus one default IGP flood > reduction feature be confusing for operators. Just as it was confusing t= o > me. > https://datatracker.ietf.org/doc/draft-ietf-lsr-dynamic-flooding/ > > > > [HC]: This draft plus the draft for flooding reduction can provide tw= o > modes of flooding reductions (i.e., centralized mode and distributed mode= ). > The latter describes the two modes, but does not include any flooding > topology computation algorithm for the distributed mode. The former > proposes a flooding topology computation algorithm to be used in the > distributed mode. > Gyan> It maybe a good idea for both documents to reference each other as to how they play together or in some respects if any provide a homogeneous complete holistic solution for flooding problem being solved. In my opinion it may not be a bad idea even to combine both drafts so the solution is complete and holistic. This will also make the overall specification flow nicely. I know that efforts were made by LSR to have a common IGP solution, however there are many inherent differences between ISIS and OSPF that from IGP Link state protocol perspective you can treat like apples to apples but really it=E2=80=99s apples and oranges. Maybe it might we wise to have sep= arate draft for both and have references linking together as the same algorithm concept and mathematically however the actual code implementation would vary as the LSDB link state data structures are completely different. Later =3D Dynamic flooding =3D 2 modes Centralized leader based and distrib= uted https://datatracker.ietf.org/doc/draft-ietf-lsr-dynamic-flooding/ This later draft per section excerpt provides both centralized and distributed algorithm see below 6.4 . Area Leader Responsibilities If the Area Leader operates in centralized mode, it MUST advertise algorithm 0 in its Area Leader Sub-TLV. In order for Dynamic Flooding to be enabled it also MUST compute and advertise a flooding topology for the area. The Area Leader may update the flooding topology at any time, however, it should not destabilize the network with undue or overly frequent topology changes. If the Area Leader operates in centralized mode and needs to advertise a new flooding topology, it floods the new flooding topology on both the new and old flooding topologies. If the Area Leader operates in distributed mode, it MUST advertise a non-zero algorithm in its Area Leader Sub-TLV. When the Area Leader advertises algorithm 0 in its Area Leader Sub- TLV and does not advertise a flooding topology, Dynamic Flooding is disabled for the area. Note this applies whether the Area Leader intends to operate in centralized mode or in distributed mode. Note that once Dynamic Flooding is enabled, disabling it risks destabilizing the network. 6.5 . Distributed Flooding Topology Calculation If the Area Leader advertises a non-zero algorithm in its Area Leader Sub-TLV, all nodes in the area that support Dynamic Flooding and the value of algorithm advertised by the Area Leader MUST compute the flooding topology based on the Area Leader's advertised algorithm. Nodes that do not support the value of algorithm advertised by the Area Leader MUST continue to use standard flooding mechanism as defined by the protocol. Nodes that do not support the value of algorithm advertised by the Area Leader MUST be considered as Dynamic Flooding incapable nodes by the Area Leader. If the value of the algorithm advertised by the Area Leader is from the range 128-254 (private distributed algorithms), it is the responsibility of the network operator to guarantee that all nodes in the area have a common understanding of what the given algorithm value represents. Former =3D WG LC https://datatracker.ietf.org/doc/html/draft-cc-lsr-flooding-reduction-08 Provides algorithm for distributed mode for this draft as well as the algorithm to be used for distributed mode later dynamic flooding draft Separate question- In light of the flooding algorithm and seeing that at the bottom of section 6.5 mentions flooding algorithm are the IANA codepoints reserved for flooding unique and non overlapping with the flex algo codepoints I believe 0-127. I would think the flooding algorithm range of values is completely separate since a different function then flex algo values. https://datatracker.ietf.org/doc/html/draft-ietf-lsr-flex-algo-07 > Best Regards, > Huaimo > ------------------------------ > *From:* Gyan Mishra > *Sent:* Thursday, May 21, 2020 10:36 AM > > *To:* Huaimo Chen > *Cc:* Acee Lindem (acee) ; lsr@ietf.or= g < > lsr@ietf.org> > *Subject:* Re: [Lsr] Flooding Topology Computation Algorithm - > draft-cc-lsr-flooding-reduction-08 Working Group Adoption Call > > > > On Wed, May 20, 2020 at 11:59 PM Huaimo Chen > wrote: > > Hi Gyan, > > Thanks much for your questions. My answers are inline below with [HC]= . > > Best Regards, > Huaimo > ------------------------------ > *From:* Gyan Mishra > *Sent:* Wednesday, May 20, 2020 11:14 AM > *To:* Huaimo Chen > *Cc:* Acee Lindem (acee) ; lsr@ietf.or= g < > lsr@ietf.org> > *Subject:* Re: [Lsr] Flooding Topology Computation Algorithm - > draft-cc-lsr-flooding-reduction-08 Working Group Adoption Call > > Huaimo > > This is a much needed feature that operators have been needing for densel= y > meshed topologies that commonly exist in data centers to accommodate very > high bandwidth E-W traffic. > [HC]: Thank you very much. > > Below is link from Cisco which has introduced feature for dynamic floodin= g > in clos high density ECMP data center topologies. > > Please look at the feature description and it does seem to be exactly the > same as this draft. Please confirm. > [HC]: It seems different. > > There maybe other vendors due to industry demand have to get the feature > deployed before it reaches standards vendor consensus with the IETF. > > > https://www.cisco.com/c/en/us/products/collateral/switches/nexus-9000-ser= ies-switches/white-paper-c11-743015.html > > > We are testing this feature and planning to deploy but wanted to ensure > that this is the same as the draft on the standards track. > [HC]: The feature appears implemented draft "Dynamic Flooding on Dense > Graphs", which does not include any flooding topology computation > algorithm. > > > Gyan> How does this draft compare to the WG LC draft for flood > reduction. Would they be two eventual standard options in the operators > toolbox or competing features for optimized flood reduction. Would havin= g > two flood reduction features standardized versus one default IGP flood > reduction feature be confusing for operators. Just as it was confusing t= o > me. > > > https://datatracker.ietf.org/doc/draft-ietf-lsr-dynamic-flooding/ > > > > Kind regards > > Gyan > > > On Tue, May 19, 2020 at 11:52 PM Huaimo Chen > wrote: > > Hi Gyan, > > Thank you very much for your questions and support. > > This Flooding Topology Computation algorithm can be used in the Dynam= ic > Flooding on Dense Graphs to compute the flooding topologies for the data > center clos dense meshed topologies with many ECMP paths. It can be used = by > the area leader in the centralized mode to compute the flooding topology. > > Best Regards, > Huaimo > ------------------------------ > *From:* Lsr on behalf of Gyan Mishra < > hayabusagsm@gmail.com> > *Sent:* Tuesday, May 19, 2020 2:39 AM > *To:* Yanhe Fan > *Cc:* lsr@ietf.org ; Acee Lindem (acee) 40cisco.com@dmarc.ietf.org> > *Subject:* Re: [Lsr] Flooding Topology Computation Algorithm - > draft-cc-lsr-flooding-reduction-08 Working Group Adoption Call > > > I support WG adoption and have a few questions related to the draft. > > Does this flooding algorithm use the dynamic flooding algorithm used in > data center clos dense meshed topologies with many ECMP paths where the > flood is decoupled from the physical topology. In the dynamic flooding > algorithm mentioned in centralized mode the flooding is computed by the > area leader and distributed to all nodes. In distributed mode each mode > the area leader determines the algorithm and then each node computes the > flooding topology based on the algorithm. > > This dynamic algorithm for optimized flood reduction would reduce the > amount of redundant flooding in highly densely meshed ospf or Isis > topologies. So this optimization of flooding would improving overall lin= k > state routing protocol convergence. > > Gyan > > On Mon, May 18, 2020 at 3:37 PM Yanhe Fan wrote: > > Support it as a co-author. > > > > Thanks, > > Yanhe > > > > *From:* Lsr *On Behalf Of *Acee Lindem (acee) > *Sent:* Friday, May 15, 2020 3:40 PM > *To:* lsr@ietf.org > *Subject:* [Lsr] Flooding Topology Computation Algorithm - > draft-cc-lsr-flooding-reduction-08 Working Group Adoption Call > > > > This begins a 3 week (due to holidays) WG adoption call for the =E2=80=9C= Flooding > Topology Computation Algorithm=E2=80=9D draft. Please issue your support = or > objection to this list by 11:59 PM, UTC on June 5th, 2020. Here is a URL > for your convenience. > > > > https://datatracker.ietf.org/doc/draft-cc-lsr-flooding-reduction/ > > > > > Thanks, > Acee > _______________________________________________ > Lsr mailing list > Lsr@ietf.org > https://www.ietf.org/mailman/listinfo/lsr > > > -- > > > > > > > > *Gyan > > Mishra* > > *Network Solutions A**rchitect * > > > > *M 301 502-1347 13101 Columbia Pike > > *Silver Spring, MD > > > -- > > > > > *Gyan Mishra* > > > > *Network Solutions A**rchitect * > > > > > > *M 301 502-1347 13101 Columbia Pike > > *Silver Spring, MD > > > -- > > > > > *Gyan Mishra* > > *Network Solutions A**rchitect * > > > > *M 301 502-1347 > 13101 > Columbia Pike > > *Silver Spring, MD > > > -- *Gyan Mishra* *Network Solutions A**rchitect * *M 301 502-134713101 Columbia Pike *Silver Spring, MD --000000000000e11c3b05a62c287b Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable


On Thu, May 21, 2020 at 11:01 AM Huaimo Chen <huaimo.chen@futurewei.com> wrote:
Hi Gyan,

=C2=A0 =C2=A0 Thanks much for your questions.

= =C2=A0Gyan> How does this draft compare to the WG LC draft for fl= ood reduction.=C2=A0 Would they be two eventual standard options in the ope= rators toolbox =C2=A0or competing features for optimized flood reduction. W= ould having two flood reduction features standardized versus one default IGP flood red= uction feature be confusing for operators.=C2=A0 Just as it was confusing t= o me.=C2=A0
https://datatracker.ietf.org/doc/draft-ietf-lsr-dynamic-flooding/=

=C2=A0 =C2=A0 [HC]: This draft plus the draft for flooding reduction can pr= ovide two modes of flooding reductions (i.e., centralized mode and distribu= ted mode). The latter describes the two modes, but does not include any flo= oding topology computation algorithm for the distributed mode. The former proposes a=C2=A0flooding topology computation algorithm to be used in the= distributed mode.=C2=A0=C2=A0

=C2= =A0 =C2=A0Gyan> It maybe a good idea for both documents to reference eac= h other as to how they play together or =C2=A0in some respects if any provi= de a homogeneous complete holistic solution for flooding problem being solv= ed. =C2=A0

In my opinion= it may not be a bad idea even to combine both drafts so the solution is co= mplete and holistic.=C2=A0 This will also make the overall specification fl= ow nicely. =C2=A0

I know= that efforts were made by LSR to have a common IGP solution, however there= are many inherent differences between ISIS and OSPF that from IGP Link sta= te protocol perspective you can treat like apples to apples but really it= =E2=80=99s apples and oranges.=C2=A0 Maybe it might we wise to have separat= e draft for both and have references linking together as the same algorithm= concept and mathematically however the actual code implementation would va= ry as the LSDB link state data structures are completely different.=C2=A0

Later =3D Dynamic floodin= g =3D 2 modes Centralized leader based and distributed=C2=A0

T= his later draft per section excerpt provides both centralized and distribut= ed algorithm see below=C2=A0

6.4.  Area Leader Responsibiliti=
es

   If the Area Leader operates in centralized mode, it MUST advertise
   algorithm 0 in its Area Leader Sub-TLV.  In order for Dynamic
   Flooding to be enabled it also MUST compute and advertise a flooding
   topology for the area.  The Area Leader may update the flooding
   topology at any time, however, it should not destabilize the network
   with undue or overly frequent topology changes.  If the Area Leader
   operates in centralized mode and needs to advertise a new flooding
   topology, it floods the new flooding topology on both the new and old
   flooding topologies.

   If the Area Leader operates in distributed mode, it MUST advertise a
   non-zero algorithm in its Area Leader Sub-TLV.

   When the Area Leader advertises algorithm 0 in its Area Leader Sub-
   TLV and does not advertise a flooding topology, Dynamic Flooding is
   disabled for the area.  Note this applies whether the Area Leader
   intends to operate in centralized mode or in distributed mode.

   Note that once Dynamic Flooding is enabled, disabling it risks
   destabilizing the network.

6.5.  Distributed Flooding Topology Calculation

   If the Area Leader advertises a non-zero algorithm in its Area Leader
   Sub-TLV, all nodes in the area that support Dynamic Flooding and the
   value of algorithm advertised by the Area Leader MUST compute the
   flooding topology based on the Area Leader's advertised algorithm.

   Nodes that do not support the value of algorithm advertised by the
   Area Leader MUST continue to use standard flooding mechanism as
   defined by the protocol.

   Nodes that do not support the value of algorithm advertised by the
   Area Leader MUST be considered as Dynamic Flooding incapable nodes by
   the Area Leader.

   If the value of the algorithm advertised by the Area Leader is from
   the range 128-254 (private distributed algorithms), it is the res=
ponsibility of the=C2=A0
network o=
perator to guarantee that all nodes in the area have a common=
 understanding of what the given algorithm value represents.<=
/span>

Former = =3D WG LC=C2=A0
Provides algorithm for distributed mode for this draft as wel= l as the algorithm to be used for distributed mode later dynamic flooding d= raft=C2=A0

Separate ques= tion-

In light of the fl= ooding algorithm and seeing that at the bottom of section 6.5 mentions floo= ding algorithm are the IANA codepoints reserved for flooding unique and non= overlapping with the flex algo codepoints I believe 0-127.=C2=A0 I would t= hink the flooding algorithm range of values is completely separate since a = different function then flex algo values.

=

Best Regards,
Huaimo
From: Gya= n Mishra <hayabusagsm@gmail.com>
Sent: Thursday, May 21, 202= 0 10:36 AM
=
To: Huaimo Chen <huaimo.chen@futurewei.com>
Cc: Acee Lindem (acee) <= acee=3D40cisco.com@dmarc.ietf.org>; lsr@ietf.org <lsr@ietf.org> Subject: Re: [Lsr] Flooding= Topology Computation Algorithm - draft-cc-lsr-flooding-reduction-08 Workin= g Group Adoption Call
=C2=A0


On Wed, May 20, 2020 at 11:59 PM Huaimo Chen <huaimo.chen@futurew= ei.com> wrote:
Hi Gyan,

=C2=A0 =C2=A0 Thanks much for your questions. My answers are inline below w= ith [HC].

Best Regards,
Huaimo
From: Gyan Mishra <hayabusagsm@g= mail.com>
Sent: Wednesday, May 20, 20= 20 11:14 AM
To: Huaimo Chen <huaimo.chen@futurewei.com>
Cc: Acee Lindem (acee) <= acee=3D40cisco.com@dmarc.ietf.org>; lsr@ietf.org <lsr@ietf.org> Subject: Re: [Lsr] Flooding= Topology Computation Algorithm - draft-cc-lsr-flooding-reduction-08 Workin= g Group Adoption Call
=C2=A0
Huaimo=C2=A0

This is a much needed feature that operators have been ne= eding for densely meshed topologies that commonly exist in data centers to = accommodate very high bandwidth E-W traffic.
[HC]: Thank you very much.

Below is link from Cisco which has introduced feature for= dynamic flooding in clos high density ECMP data center topologies.

Please look at the feature description and it does seem t= o be exactly the same as this draft.=C2=A0 Please confirm.=C2=A0
[HC]: It seems different.=C2=A0

There maybe other vendors due to industry demand have to = get the feature deployed before it reaches standards vendor consensus with = the IETF.


We are testing this feature and planning to deploy but wa= nted to ensure that this is the same as the draft on the standards track.
[HC]: The feature appears implemented draft "Dynamic Flooding on Dense Graph= s", which does not include any flooding topology computation algorithm= .=C2=A0

=C2=A0 =C2=A0 Gyan> How does this draft compare to the= WG LC draft for flood reduction.=C2=A0 Would they be two eventual standard= options in the operators toolbox =C2=A0or competing features for optimized= flood reduction. Would having two flood reduction features standardized versus one default IGP flood reduction feature be confusing f= or operators.=C2=A0 Just as it was confusing to me.


Kind regards=C2=A0

Gyan


On Tue, May 19, 2020 at 11:52 PM Huaimo Chen <huaimo.chen@futurew= ei.com> wrote:
Hi Gy= an,

=C2= =A0 =C2=A0 Thank you very much for your questions and support.

=C2= =A0 =C2=A0 This Flooding Topology Computation algorithm can be used in the Dynamic Flooding on Dense Graphs to compute the flooding topologies for the=C2=A0d= ata center clos dense meshed topologies with many ECMP paths. It can be use= d by the area leader in the centralized mode to compute the flooding topolo= gy. =C2=A0=C2=A0

Best = Regards,
Huaim= o
From: Lsr <lsr-bounces@ietf.org> on behalf of Gyan Mishra <hayabusagsm@gmail.co= m>
Sent: Tuesday, May 19, 2020= 2:39 AM
To: Yanhe Fan <yfan@casa-systems.com>
Cc: lsr@ietf.org <lsr@ietf.org>; Acee Lindem (ace= e) <acee=3D40cisco.com@dmarc.ietf.org&= gt;
Subject: Re: [Lsr] Flooding= Topology Computation Algorithm - draft-cc-lsr-flooding-reduction-08 Workin= g Group Adoption Call
=C2=A0

I support WG adoption and have a few questions related to= the draft.

Does this flooding algorithm use the dynamic flooding alg= orithm used in data center clos dense meshed topologies with many ECMP path= s where the flood is decoupled from the physical topology.=C2=A0 In the dyn= amic flooding algorithm mentioned in centralized mode the flooding is computed by the area leader and distributed to all no= des.=C2=A0 In distributed mode each mode the area leader determines the alg= orithm and then each node computes the flooding topology based on the algor= ithm. =C2=A0

This dynamic algorithm for optimized flood reduction woul= d reduce the amount of redundant flooding in highly densely meshed ospf or = Isis topologies.=C2=A0 So this optimization of flooding would improving ove= rall link state routing protocol convergence.

Gyan=C2=A0

On Mon, May 18, 2020 at 3:37 PM Yanhe Fan <yfan@casa-systems.com>= ; wrote:

Support it as a co-author.<= /span>

=C2=A0

Thanks,

Yanhe

_______________________________________________
Lsr mailing list
Lsr@ietf.org
https://www.ietf.org/mailman/listinfo/lsr
--


Gyan Mishra

Network Solutions Architect=C2=A0

M 301 502-1347
13101 Columbia Pike=C2=A0
Silver Spring, MD


--


Gyan M= ishra

Network Solutions Architect=C2=A0

<= font face=3D"georgia, serif" style=3D"font-family:georgia,serif;color:rgb(0= ,0,0)">M 301 502-1347
13101 Columbia Pike=C2=A0
Silver Spring, MD


--


Gyan M= ishra

Network Solutions Architect=C2=A0

M 301 502-1347
13101 Columbia Pike=C2=A0
Silver Spring, MD<= /a>


--
--000000000000e11c3b05a62c287b-- From nobody Thu May 21 12:39:51 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 6E6A83A0B21; Thu, 21 May 2020 12:39:10 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.899 X-Spam-Level: X-Spam-Status: No, score=-1.899 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id x-qy_RAc8WTU; Thu, 21 May 2020 12:39:05 -0700 (PDT) Received: from outgoing.mit.edu (outgoing-auth-1.mit.edu [18.9.28.11]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 4C54E3A0B1B; Thu, 21 May 2020 12:39:04 -0700 (PDT) Received: from kduck.mit.edu ([24.16.140.251]) (authenticated bits=56) (User authenticated as kaduk@ATHENA.MIT.EDU) by outgoing.mit.edu (8.14.7/8.12.4) with ESMTP id 04LJcung032164 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Thu, 21 May 2020 15:38:58 -0400 Date: Thu, 21 May 2020 12:38:56 -0700 From: Benjamin Kaduk To: Peter Psenak Cc: The IESG , draft-ietf-isis-mpls-elc@ietf.org, lsr-chairs@ietf.org, lsr@ietf.org, Acee Lindem , aretana.ietf@gmail.com Message-ID: <20200521193856.GJ58497@kduck.mit.edu> References: <158992828112.6026.1646593855480055081@ietfa.amsl.com> <1242ad52-bb48-8526-b65b-d413e0cd9e25@cisco.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1242ad52-bb48-8526-b65b-d413e0cd9e25@cisco.com> User-Agent: Mutt/1.12.1 (2019-06-15) Archived-At: Subject: Re: [Lsr] Benjamin Kaduk's Discuss on draft-ietf-isis-mpls-elc-12: (with DISCUSS and COMMENT) X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 21 May 2020 19:39:12 -0000 Hi Peter, On Thu, May 21, 2020 at 12:05:39PM +0200, Peter Psenak wrote: > Benjamin, > > thanks for review, please see inline (##PP): > > On 20/05/2020 00:44, Benjamin Kaduk via Datatracker wrote: > > Benjamin Kaduk has entered the following ballot position for > > draft-ietf-isis-mpls-elc-12: Discuss > > > > When responding, please keep the subject line intact and reply to all > > email addresses included in the To and CC lines. (Feel free to cut this > > introductory paragraph, however.) > > > > > > Please refer to https://www.ietf.org/iesg/statement/discuss-criteria.html > > for more information about IESG DISCUSS and COMMENT positions. > > > > > > The document, along with other ballot positions, can be found here: > > https://datatracker.ietf.org/doc/draft-ietf-isis-mpls-elc/ > > > > > > > > ---------------------------------------------------------------------- > > DISCUSS: > > ---------------------------------------------------------------------- > > > > As for other reviewers, many of my comments duplicate those for the OSPF > > document; I expect that the analogous responses apply and am fine if > > they only appear for one document's review. > > > > Here, the question I have about normative language applies to the text > > in Section 3: > > > > When a router propagates a prefix between ISIS levels ([RFC5302], it > > MUST preserve the ELC signaling for this prefix. > > > > The scenario in question is analogous to the OSPF cross-area case: is > > the router propagating the prefix between ISIS levels required to > > implement this document; is preservation of the flag value a new > > requirement from this document vs. a preexisting property; and is this > > document trying to make normative requirements of devices that don't > > implement this document? > > ##PP > this is a new requirement and only applies to the routers that support > this document. We are not making normative requirements of devices that > don't implement this document, we cannot. > > Maybe we can add that it only applies to the routers that supports this > extension: > > "When a router supporting this extension propagates a prefix between > ISIS levels ([RFC5302], it MUST preserve the ELC signaling for this prefix." > > Would it work? That would work, yes. I think what bothers me about the current text is that it feels like a global statement that holds universally everywhere (and as such would be "scope overreach"). Even to say something like "ELC signaling MUST be preserved when a router propagates a prefix between ISIS levels" (which is superficially similar) does not bother me very much, since it presumes a knowledge of what ELC signaling is (and thus, implementation of this document) in a way that "unknown prefix attribute flag 3" does not. That is, we clearly (given your above explanation) don't expect the "unknown prefix attribute flag 3" to get propagaged, and only when we know that it's the ELC signalling does the requirement kick in, if that makes sense. With respect to Alvaro's clarification, your answer for (1) makes sense; thanks! I think Alvaro has offered to help work out what (if any) additional text we might want to be sure that the answer to (2) is clear in the document. > > > > > Likewise, the ASBR case for cross-protocol redistribution seems to > > rather inherently require understanding the semantics of the flags being > > translated. > > similarly to the above I can chnage to: > > "When a router supporting this extension redistribute a prefix ..." > > > > > > > > ---------------------------------------------------------------------- > > COMMENT: > > ---------------------------------------------------------------------- > > > > Section 1 > > > > Should we add a sentence at the end of the last paragraph about how > > "this document defines a mechanism to signal the ERLD using IS-IS"? > > not sure I understand, how is described in the body of the document. I think I maybe put a little more detail on the motivation for this question in the OSPF document's comments. Basically, it's about parity between Abstract and Introduction -- the Introduction says clearly "this draft defines a mechanism to signal the ELC using IS-IS", but there is not an analogous statement about the ERLD signaling mechanism. As such, it's an editorial matter of style and you should feel free to ignore the comment or do what you see fit. > > > > In cases where LSPs are used (e.g., SR-MPLS [RFC8660], it would be > > > > side note(?): I don't know that SR-MPLS is so popular so as to be > > privileged as the only example given for LSP usage. If we instead > > talked about using IGPs to signal labels, this selection would seem less > > surprising to me. > > this document describes the ELC/ERLD capability signaling for SR MPLS. > For non SR MPLS cases, thee are existing mechanisms to learn ELC/ERLD. > > I can replace the text with: > > "In cases where SR is used with the MPLS Data Plane" > > Would it work? Sure, thanks. > > > > > Section 3 > > > > unless all of its interfaces are capable of processing ELs. If a > > router supports ELs on all of its interfaces, it SHOULD set the ELC > > for every local host prefix it advertises in IS-IS. > > > > Do we want to say anything about (not) advertising the ELC for other > > prefixes? > > Do we have to? I can add "MUST NOT set ELC with for any other prefix", > but I find it unneeded. This is the "comment" section of the document, so no, you don't have to :) I mostly ask because we give guidance on what to do for local host prefixes but say nothing about the other case. That could be taken to imply that we don't know what guidance to give, even though someone skilled in the area who thinks through what the mechanism is doing will come to the conclusion that it makes no sense/is actively harmful to advertise the ELC for other prefixes. > > > > Section 4 > > > > I agree with Roman's comment about code 2 vs TBD2. > > that has been fixed already. > > > > > ERLD in the range between 0 to 255. The scope of the advertisement > > depends on the application. If a router has multiple interfaces with > > > > Just to check: w.r.t. "scope", both this document and the OSPF one only > > define usage of this MSD type at the scope of a single node, right? (I > > don't see a particular reason to preclude using it at a different > > scope.) > > the scope here means where the information will be flooded - area only > or network wide. No such thing as a node scope. Oops, sorry for misremembering that part, and thanks for the clarification. > > > > > Section 6 > > > > - Bit 3 in the Bit Values for Prefix Attribute Flags Sub-TLV > > registry has been assigned to the ELC Flag. IANA is asked to > > > > Is there an "IS-IS" in the name of this registry? > > no the registry name is "Bit Values for Prefix Attribute Flags Sub-TLV". Okay, thanks for confirming. > > > > > Section 7 > > > > Should we say anything about considerations for redistributing ELC/ERLD > > information at the ASBR with respect to exposing "internal information" > > to external parties? > > why would this be "internal information" and why redistribution would be > "external party"? Redistribution between IGPs is predominantly done > between IGPs under same administrative domain. I don't have any scenario in mind; I just wanted to check if there were any significant considerations to mention. It sounds like there aren't such considerations, and thus nothing to mention. > > > > > This document specifies the ability to advertise additional node > > capabilities using IS-IS and BGP-LS. As such, the security > > considerations as described in [RFC7981], [RFC7752], [RFC7794], > > [RFC8491], [RFC8662], [I-D.ietf-idr-bgp-ls-segment-routing-ext] and > > > > RFC 8662's security considerations have a pretty hard dependency on RFC > > 6790's security considerations; it might be worth mentioning 6790 > > directly in this list as well. > > would not that be implicit when mentioning RFC 8662? Yes; this is mostly a question of style. > > > > > [I-D.ietf-idr-bgp-ls-segment-routing-msd] are applicable to this > > document. > > > > Could we also have a brief note that the normal IS-IS authentication > > mechanisms serve to protect the ELC/ERLD information? > > do we need to repeat this every time we add a bit in the TLV? It's my preference, though not a strict need. > > > > Incorrectly setting the E flag during origination, propagation or > > redistribution may lead to black-holing of the traffic on the egress > > node. > > > > This is what happens when the E flag should not be set but is > > erroneously set. Should we also say what happens if we should set the E > > flag but erroneously clear it (e.g., that poor or no load-balancing may > > occur)? > > yes, there is a text there already: > > "Incorrectly setting of the ERLD value may lead to poor or no > load-balancing of the traffic." I thought that was about the ERLD value, not the ELC indicator, but trust you to know best. > > > > Section 8 > > > > I do see the note in the shepherd writeup about the sixth author (thank > > you!); if we're already breaking through the 5-author limit, did we > > consider making those who "should be considered as co-authors" listed as > > co-authors? > > I'm not fun of this 5 authors rule to be honest. > > > > > Section 10.1 > > > > Should we reference RFC 7981 from Section 4 as well? Right now we seem > > to only use it for the security considerations, which is not necessarily > > enough to qualify it as a normative reference. > > we reference RFC8491, which references RFC 7981. I don't see a need to > reference RFC 7981 directly. Okay. Thanks for the clarifications and updates! -Ben From nobody Thu May 21 12:41:33 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 10A663A0911; Thu, 21 May 2020 12:41:25 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.899 X-Spam-Level: X-Spam-Status: No, score=-1.899 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 3a-aASfWj530; Thu, 21 May 2020 12:41:23 -0700 (PDT) Received: from outgoing.mit.edu (outgoing-auth-1.mit.edu [18.9.28.11]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id E3CDE3A0900; Thu, 21 May 2020 12:41:22 -0700 (PDT) Received: from kduck.mit.edu ([24.16.140.251]) (authenticated bits=56) (User authenticated as kaduk@ATHENA.MIT.EDU) by outgoing.mit.edu (8.14.7/8.12.4) with ESMTP id 04LJfF0x000531 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Thu, 21 May 2020 15:41:17 -0400 Date: Thu, 21 May 2020 12:41:15 -0700 From: Benjamin Kaduk To: Peter Psenak Cc: The IESG , draft-ietf-ospf-mpls-elc@ietf.org, lsr-chairs@ietf.org, lsr@ietf.org, Acee Lindem , aretana.ietf@gmail.com Message-ID: <20200521194115.GK58497@kduck.mit.edu> References: <158992822966.6522.4643872233017159559@ietfa.amsl.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.12.1 (2019-06-15) Archived-At: Subject: Re: [Lsr] Benjamin Kaduk's Discuss on draft-ietf-ospf-mpls-elc-13: (with DISCUSS and COMMENT) X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 21 May 2020 19:41:26 -0000 On Thu, May 21, 2020 at 12:16:44PM +0200, Peter Psenak wrote: > Hi Benjamin, > > thanks for review. > > Please see inline (##PP) two responses to OSPF specific comments. > > > On 20/05/2020 00:43, Benjamin Kaduk via Datatracker wrote: > > Benjamin Kaduk has entered the following ballot position for > > draft-ietf-ospf-mpls-elc-13: Discuss > > > > When responding, please keep the subject line intact and reply to all > > email addresses included in the To and CC lines. (Feel free to cut this > > introductory paragraph, however.) > > > > > > Please refer to https://www.ietf.org/iesg/statement/discuss-criteria.html > > for more information about IESG DISCUSS and COMMENT positions. > > > > > > The document, along with other ballot positions, can be found here: > > https://datatracker.ietf.org/doc/draft-ietf-ospf-mpls-elc/ > > > > > > > > ---------------------------------------------------------------------- > > DISCUSS: > > ---------------------------------------------------------------------- > > > > I have a question about the scope of some normative language, which may > > or may not be problematic but I'm too ignorant of OSPF details to be > > able to answer myself. In Section 3 we say that: > > > > When an OSPF Area Border Router (ABR) distributes information between > > connected areas it MUST preserve the ELC setting. > > > > My undesrtanding is that it's normal operation for an ABR to > > distribution information about prefixes and such between areas, and in > > particular that an ABR does not necessarily need to know the semantic > > details of every bit of information being distributed in that fashion. > > So, I am imagining a scenario where some routers in both areas > > advertise/understand the ELC flag but the ABR between them does not > > implement this spec. What would happen in such a scenario? If the ABR > > is still expected to distribute the ELC setting without change, isn't > > that just a core requirement from the respective OSPF specs, as opposed > > to a new requirement imposed by this spec (which, in this scenario, the > > ABR is not claiming to adhere to anyway)? > > > > There is perhaps a similar question about the ASBR guidance, though when > > doing cross-protocol signalling there is a more clear need for the ASBR > > to understand the semantics of the flags it is redistributing (and it's > > only a "SHOULD"). > > > > > > ---------------------------------------------------------------------- > > COMMENT: > > ---------------------------------------------------------------------- > > > > Section 1 > > > > The abstract is pretty explicit that "this draft defines" both ELC and > > ERLD signaling capabilities, but this section only has a clear statement > > for the ELC. Should we put something at the end of the last paragraph > > about "this document defines a mechanism to signal the ERLD using OSPFv2 > > and OSPFv3"? > > ##PP > this has been already addressed based on previous comments. Latest text > is as follows: > > "Multiprotocol Label Switching (MPLS) has defined a mechanism to > load-balance traffic flows using Entropy Labels (EL). An ingress Label > Switching Router (LSR) cannot insert ELs for packets going into a given > Label Switched Path (LSP) unless an egress LSR has indicated via > signaling that it has the capability to process ELs, referred to as the > Entropy Label Capability (ELC), on that LSP. In addition, it would be > useful for ingress LSRs to know each LSR's capability for reading the > maximum label stack depth and performing EL-based load-balancing, > referred to as Entropy Readable Label Depth (ERLD). This document > defines a mechanism to signal these two capabilities using OSPFv2 and > OSPFv3 and BGP-LS." Great; thanks! > > In cases where LSPs are used (e.g., SR-MPLS [RFC8660], it would be > > > > side note(?): I don't know that SR-MPLS is so popular so as to be > > privileged as the only example given for LSP usage. If we instead > > talked about using IGPs to signal labels, this selection would seem less > > surprising to me. > > > > Section 3 > > > > If the router supports ELs on all of its interfaces, it SHOULD > > advertise the ELC with every local host prefix it advertises in OSPF. > > > > Do we want to say anything about (not) advertising the ELC for other > > prefixes? > > > > Section 7 > > > > Should we say anything about considerations for redistributing ELC/ERLD > > information at the ASBR with respect to exposing "internal information" > > to external parties? > > > > This document specifies the ability to advertise additional node > > capabilities using OSPF and BGP-LS. As such, the security > > considerations as described in [RFC5340], [RFC7770], [RFC7752], > > [RFC7684], [RFC8476], [RFC8662], > > > > RFC 8662's security considerations have a pretty hard dependency on RFC > > 6790's security considerations; it might be worth mentioning 6790 > > directly in this list as well. > > > > [I-D.ietf-idr-bgp-ls-segment-routing-ext] and > > [I-D.ietf-idr-bgp-ls-segment-routing-msd] are applicable to this > > document. > > > > Could we also have a brief note that the (respective) OSPF security > > mechanisms serve to protect the ELC/ERLD information? > > > > Incorrectly setting the E flag during origination, propagation or > > redistribution may lead to black-holing of the traffic on the egress > > node. > > > > This is what happens when the E flag should not be set but is > > erroneously set. Should we also say what happens if we should set the E > > flag but erroneously clear it (e.g., that poor or no load-balancing may > > occur)? > > > > Section 8 > > > > I do see the note in the shepherd writeup about the sixth author (thank > > you!); if we're already breaking through the 5-author limit, did we > > consider making those who "should be considered as co-authors" listed as > > co-authors? > > > > Section 10.2 > > > > It's slightly surprising to see the core OSPF protocols only listed as > > informative, but I can see how they are to be considered "basic > > specifications" in the vein of > > https://www.ietf.org/about/groups/iesg/statements/normative-informative-references/ > > ##PP > right, I can add it as normative, or remove completely, or keep as > informative. Whatever you like :) Keep it as-is seems simplest, then. But thanks :) -Ben From nobody Thu May 21 13:08:02 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 8E0AF3A086B for ; Thu, 21 May 2020 13:07:53 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -9.587 X-Spam-Level: X-Spam-Status: No, score=-9.587 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, HTML_MESSAGE=0.001, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_PASS=-0.001, T_REMOTE_IMAGE=0.01, URIBL_BLOCKED=0.001, USER_IN_DEF_DKIM_WL=-7.5] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=cisco.com header.b=BaG5Jo7E; dkim=pass (1024-bit key) header.d=cisco.onmicrosoft.com header.b=xUVNiPUP Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) 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autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id if5ydzyaKG3d for ; Thu, 21 May 2020 13:20:20 -0700 (PDT) Received: from mail-il1-x136.google.com (mail-il1-x136.google.com [IPv6:2607:f8b0:4864:20::136]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id B9E3C3A07E5 for ; Thu, 21 May 2020 13:20:19 -0700 (PDT) Received: by mail-il1-x136.google.com with SMTP id 17so8563828ilj.3 for ; Thu, 21 May 2020 13:20:19 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=TOrcUsyNFLoxklsRQ9d1+MDzw088bThMb5YIx6NMwP4=; b=gY+obSuxtzV4qgiSeTo6eZmI3JCAV5UUB4fKPwBB6brdhywhOZZTPzwJrQSWE43SxT 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X-Google-Smtp-Source: ABdhPJxM906e1qZ44To/hlviqAzMVIZlwgSfdzp1CqfWDb1FoErIObyh5xODXyWr8Ruzd5bzua5FsbuuxIlrQGHXOe0= X-Received: by 2002:a92:c948:: with SMTP id i8mr10512935ilq.258.1590092418910; Thu, 21 May 2020 13:20:18 -0700 (PDT) MIME-Version: 1.0 References: <63330FD6-EDE8-4938-AA85-948279C57E34@cisco.com> <424B17B1-D66D-4708-A819-855E972841AF@cisco.com> In-Reply-To: <424B17B1-D66D-4708-A819-855E972841AF@cisco.com> From: Gyan Mishra Date: Thu, 21 May 2020 16:20:07 -0400 Message-ID: To: "Acee Lindem (acee)" Cc: Huaimo Chen , "lsr@ietf.org" Content-Type: multipart/alternative; boundary="000000000000ca114f05a62e3d68" Archived-At: Subject: Re: [Lsr] Flooding Topology Computation Algorithm - draft-cc-lsr-flooding-reduction-08 Working Group Adoption Call X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 21 May 2020 20:20:25 -0000 --000000000000ca114f05a62e3d68 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Yes and I have started reviewing the LSR mail archives as I am late in the discussion for this. If you have link to any particular dates in the archives would be helpful. That sums up all the questions I have so if all answered in the archives then I am all set. I support the draft moving forward as flood reduction is a much needed feature. I think overall both drafts will really help large data centers with any overlay underlay vxlan spine leaf meshed CLOS highly meshed topology that scales out horizontally with a large spine footprint - this is a much much needed feature. This also helps eliminate complexity of the workaround of using BGP in the underlay which to me adds tremendous complexity. Kind regards Gyan On Thu, May 21, 2020 at 4:07 PM Acee Lindem (acee) wrote: > Speaking as WG Co-chair: > > > > Hi Gyan, > > > > I guess you=E2=80=99ve joined this discussion late. It might be a good id= ea to > review the LSR mailing list archives. > > > > *From: *Gyan Mishra > *Date: *Thursday, May 21, 2020 at 1:51 PM > *To: *Huaimo Chen > *Cc: *Acee Lindem , "lsr@ietf.org" > *Subject: *Re: [Lsr] Flooding Topology Computation Algorithm - > draft-cc-lsr-flooding-reduction-08 Working Group Adoption Call > > > > > > > > On Thu, May 21, 2020 at 11:01 AM Huaimo Chen > wrote: > > Hi Gyan, > > > > Thanks much for your questions. > > > > Gyan> How does this draft compare to the WG LC draft for flood > reduction. Would they be two eventual standard options in the operators > toolbox or competing features for optimized flood reduction. Would havin= g > two flood reduction features standardized versus one default IGP flood > reduction feature be confusing for operators. Just as it was confusing t= o > me. > > https://datatracker.ietf.org/doc/draft-ietf-lsr-dynamic-flooding/ > > > > > [HC]: This draft plus the draft for flooding reduction can provide tw= o > modes of flooding reductions (i.e., centralized mode and distributed mode= ). > The latter describes the two modes, but does not include any flooding > topology computation algorithm for the distributed mode. The former > proposes a flooding topology computation algorithm to be used in the > distributed mode. > > > > Gyan> It maybe a good idea for both documents to reference each other > as to how they play together or in some respects if any provide a > homogeneous complete holistic solution for flooding problem being solved. > > > > It is a good idea to have this new draft reference the dynamic-flooding > but not vice-versa. The existing dynamic flooding draft provides a > framework for any dynamic flooding algorithm that provides a separate > flooding topology. This algorithm is just the first to be formally propos= ed > in a draft. Note that another algorithm was presented during the LSR > virtual interim which replaced IETF 107. > > > > In my opinion it may not be a bad idea even to combine both drafts so the > solution is complete and holistic. This will also make the overall > specification flow nicely. > > > > No =E2=80=93 we=E2=80=99re not going to do this. > > > > Thanks, > > Acee > > > > I know that efforts were made by LSR to have a common IGP solution, > however there are many inherent differences between ISIS and OSPF that fr= om > IGP Link state protocol perspective you can treat like apples to apples b= ut > really it=E2=80=99s apples and oranges. Maybe it might we wise to have s= eparate > draft for both and have references linking together as the same algorithm > concept and mathematically however the actual code implementation would > vary as the LSDB link state data structures are completely different. > > > > Later =3D Dynamic flooding =3D 2 modes Centralized leader based and > distributed > > > > https://datatracker.ietf.org/doc/draft-ietf-lsr-dynamic-flooding/ > > > > This later draft per section excerpt provides both centralized and > distributed algorithm see below > > > > *6.4 . Area Leader Responsibilities* > > > > If the Area Leader operates in centralized mode, it MUST advertise > > algorithm 0 in its Area Leader Sub-TLV. In order for Dynamic > > Flooding to be enabled it also MUST compute and advertise a flooding > > topology for the area. The Area Leader may update the flooding > > topology at any time, however, it should not destabilize the network > > with undue or overly frequent topology changes. If the Area Leader > > operates in centralized mode and needs to advertise a new flooding > > topology, it floods the new flooding topology on both the new and old > > flooding topologies. > > > > If the Area Leader operates in distributed mode, it MUST advertise a > > non-zero algorithm in its Area Leader Sub-TLV. > > > > When the Area Leader advertises algorithm 0 in its Area Leader Sub- > > TLV and does not advertise a flooding topology, Dynamic Flooding is > > disabled for the area. Note this applies whether the Area Leader > > intends to operate in centralized mode or in distributed mode. > > > > Note that once Dynamic Flooding is enabled, disabling it risks > > destabilizing the network. > > > > *6.5 . Distributed Flooding Topology Calculation* > > > > If the Area Leader advertises a non-zero algorithm in its Area Leader > > Sub-TLV, all nodes in the area that support Dynamic Flooding and the > > value of algorithm advertised by the Area Leader MUST compute the > > flooding topology based on the Area Leader's advertised algorithm. > > > > Nodes that do not support the value of algorithm advertised by the > > Area Leader MUST continue to use standard flooding mechanism as > > defined by the protocol. > > > > Nodes that do not support the value of algorithm advertised by the > > Area Leader MUST be considered as Dynamic Flooding incapable nodes by > > the Area Leader. > > > > If the value of the algorithm advertised by the Area Leader is from > > the range 128-254 (private distributed algorithms), it is the responsi= bility of the > > network operator to guarantee that all nodes in the area have a common un= derstanding of what the given algorithm value represents. > > > > Former =3D WG LC > > https://datatracker.ietf.org/doc/html/draft-cc-lsr-flooding-reduction-08 > > > > Provides algorithm for distributed mode for this draft as well as the > algorithm to be used for distributed mode later dynamic flooding draft > > > > Separate question- > > > > In light of the flooding algorithm and seeing that at the bottom of > section 6.5 mentions flooding algorithm are the IANA codepoints reserved > for flooding unique and non overlapping with the flex algo codepoints I > believe 0-127. I would think the flooding algorithm range of values is > completely separate since a different function then flex algo values. > > > > https://datatracker.ietf.org/doc/html/draft-ietf-lsr-flex-algo-07 > > > > > > Best Regards, > > Huaimo > ------------------------------ > > *From:* Gyan Mishra > *Sent:* Thursday, May 21, 2020 10:36 AM > > > *To:* Huaimo Chen > *Cc:* Acee Lindem (acee) ; lsr@ietf.or= g < > lsr@ietf.org> > *Subject:* Re: [Lsr] Flooding Topology Computation Algorithm - > draft-cc-lsr-flooding-reduction-08 Working Group Adoption Call > > > > > > > > On Wed, May 20, 2020 at 11:59 PM Huaimo Chen > wrote: > > Hi Gyan, > > > > Thanks much for your questions. My answers are inline below with [HC]= . > > > > Best Regards, > > Huaimo > ------------------------------ > > *From:* Gyan Mishra > *Sent:* Wednesday, May 20, 2020 11:14 AM > *To:* Huaimo Chen > *Cc:* Acee Lindem (acee) ; lsr@ietf.or= g < > lsr@ietf.org> > *Subject:* Re: [Lsr] Flooding Topology Computation Algorithm - > draft-cc-lsr-flooding-reduction-08 Working Group Adoption Call > > > > Huaimo > > > > This is a much needed feature that operators have been needing for densel= y > meshed topologies that commonly exist in data centers to accommodate very > high bandwidth E-W traffic. > > [HC]: Thank you very much. > > > > Below is link from Cisco which has introduced feature for dynamic floodin= g > in clos high density ECMP data center topologies. > > > > Please look at the feature description and it does seem to be exactly the > same as this draft. Please confirm. > > [HC]: It seems different. > > > > There maybe other vendors due to industry demand have to get the feature > deployed before it reaches standards vendor consensus with the IETF. > > > > > https://www.cisco.com/c/en/us/products/collateral/switches/nexus-9000-ser= ies-switches/white-paper-c11-743015.html > > > > > We are testing this feature and planning to deploy but wanted to ensure > that this is the same as the draft on the standards track. > > [HC]: The feature appears implemented draft "Dynamic Flooding on Dense > Graphs", which does not include any flooding topology computation > algorithm.. > > > > Gyan> How does this draft compare to the WG LC draft for flood > reduction. Would they be two eventual standard options in the operators > toolbox or competing features for optimized flood reduction. Would havin= g > two flood reduction features standardized versus one default IGP flood > reduction feature be confusing for operators. Just as it was confusing t= o > me. > > > > > > https://datatracker.ietf.org/doc/draft-ietf-lsr-dynamic-flooding/ > > > > > Kind regards > > > > Gyan > > > > > > On Tue, May 19, 2020 at 11:52 PM Huaimo Chen > wrote: > > Hi Gyan, > > > > Thank you very much for your questions and support. > > > > This Flooding Topology Computation algorithm can be used in the > Dynamic Flooding on Dense Graphs to compute the flooding topologies for > the data center clos dense meshed topologies with many ECMP paths. It can > be used by the area leader in the centralized mode to compute the floodin= g > topology. > > > > Best Regards, > > Huaimo > ------------------------------ > > *From:* Lsr on behalf of Gyan Mishra < > hayabusagsm@gmail.com> > *Sent:* Tuesday, May 19, 2020 2:39 AM > *To:* Yanhe Fan > *Cc:* lsr@ietf.org ; Acee Lindem (acee) 40cisco.com@dmarc.ietf.org> > *Subject:* Re: [Lsr] Flooding Topology Computation Algorithm - > draft-cc-lsr-flooding-reduction-08 Working Group Adoption Call > > > > > > I support WG adoption and have a few questions related to the draft. > > > > Does this flooding algorithm use the dynamic flooding algorithm used in > data center clos dense meshed topologies with many ECMP paths where the > flood is decoupled from the physical topology. In the dynamic flooding > algorithm mentioned in centralized mode the flooding is computed by the > area leader and distributed to all nodes. In distributed mode each mode > the area leader determines the algorithm and then each node computes the > flooding topology based on the algorithm. > > > > This dynamic algorithm for optimized flood reduction would reduce the > amount of redundant flooding in highly densely meshed ospf or Isis > topologies. So this optimization of flooding would improving overall lin= k > state routing protocol convergence. > > > > Gyan > > > > On Mon, May 18, 2020 at 3:37 PM Yanhe Fan wrote: > > Support it as a co-author. > > > > Thanks, > > Yanhe > > > > *From:* Lsr *On Behalf Of *Acee Lindem (acee) > *Sent:* Friday, May 15, 2020 3:40 PM > *To:* lsr@ietf.org > *Subject:* [Lsr] Flooding Topology Computation Algorithm - > draft-cc-lsr-flooding-reduction-08 Working Group Adoption Call > > > > This begins a 3 week (due to holidays) WG adoption call for the =E2=80=9C= Flooding > Topology Computation Algorithm=E2=80=9D draft. Please issue your support = or > objection to this list by 11:59 PM, UTC on June 5th, 2020. Here is a URL > for your convenience. > > > > https://datatracker.ietf.org/doc/draft-cc-lsr-flooding-reduction/ > > > > > Thanks, > Acee > > _______________________________________________ > Lsr mailing list > Lsr@ietf.org > https://www.ietf.org/mailman/listinfo/lsr > > > -- > > [image: Image removed by sender.] > > > *Gyan > Mishra* > > > > *Network Solutions Architect * > > > > *M 301 502-1347 13101 Columbia Pike > > *Silver Spring, MD > > > > > -- > > [image: Image removed by sender.] > > > *Gyan Mishra* > > *Network Solutions Architect * > > > > > > *M 301 502-1347 13101 Columbia Pike > > *Silver Spring, MD > > > > > -- > > [image: Image removed by sender.] > > > *Gyan Mishra* > > *Network Solutions Architect * > > > > > *M 301 502-1347 13101 Columbia Pike > > *Silver Spring, MD > > > > > -- > > [image: Image removed by sender.] > > *Gyan Mishra* > > *Network Solutions Architect * > > > > > *M 301 502-1347 13101 Columbia Pike > > *Silver Spring, MD > > > > --=20 *Gyan Mishra* *Network Solutions A**rchitect * *M 301 502-134713101 Columbia Pike *Silver Spring, MD --000000000000ca114f05a62e3d68 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable

Yes and I have started reviewing the LSR m= ail archives as I am late in the discussion for this.

If you have link to any particular dates in t= he archives would be helpful.

That sums up all the questions I have so if all answered in the archi= ves then I am all set.

I= support the draft moving forward as flood reduction is a much needed featu= re. =C2=A0

I think overa= ll both drafts will really help large data centers with any overlay underla= y vxlan spine leaf meshed CLOS highly meshed topology that scales out horiz= ontally with a large spine footprint - this is a much much needed feature.= =C2=A0 This also helps eliminate complexity of the workaround of using BGP = in the underlay which to me adds tremendous complexity.

Kind regards=C2=A0

Gyan=C2=A0

On Thu, May 21, 2020 at 4:0= 7 PM Acee Lindem (acee) <acee@cisco.co= m> wrote:

Speaking as WG Co-chair:

=C2=A0

Hi Gyan,

=C2=A0

I guess you=E2=80=99ve joined this discussion late. = It might be a good idea to review the LSR mailing list archives.

=C2=A0

From: Gyan Mishra <hayabusagsm@gmail.c= om>
Date: Thursday, May 21, 2020 at 1:51 PM
To: Huaimo Chen <huaimo.chen@futurewei.com>
Cc: Acee Lindem <acee@cisco.com>, "lsr@ietf.org" <lsr@ietf.org>
Subject: Re: [Lsr] Flooding Topology Computation Algorithm - draft-c= c-lsr-flooding-reduction-08 Working Group Adoption Call

=C2=A0

=C2=A0

=C2=A0

On Thu, May 21, 2020 at 1= 1:01 AM Huaimo Chen <huaimo.chen@futurewei.com> wrote:

Hi Gyan,

=C2=A0

=C2=A0 =C2=A0 Thanks much for your questions.=

=C2=A0

=C2=A0Gyan> How does this draft compare to the WG LC= draft for flood reduction.=C2=A0 Would they be two eventual standard optio= ns in the operators toolbox =C2=A0or competing features for optimized flood reduction. Would having two flood reduction features s= tandardized versus one default IGP flood reduction feature be confusing for= operators.=C2=A0 Just as it was confusing to me.=C2=A0

=C2=A0

=C2=A0 =C2=A0 [HC]: This draft plus the draft for flood= ing reduction can provide two modes of flooding reductions (i.e., centraliz= ed mode and distributed mode). The latter describes the two modes, but does not include any flooding topology computation algo= rithm for the distributed mode. The former proposes a=C2=A0flooding topology computation algorithm to be used in the = distributed mode.=C2=A0=C2=A0

=C2=A0

=C2=A0 =C2=A0Gyan> It = maybe a good idea for both documents to reference each other as to how they= play together or =C2=A0in some respects if any provide a homogeneous compl= ete holistic solution for flooding problem being solved. =C2=A0

=C2=A0

It is a good idea to have this new draft reference t= he dynamic-flooding but not vice-versa. The existing dynamic flooding draft= provides a framework for any dynamic flooding algorithm that provides a se= parate flooding topology. This algorithm is just the first to be formally proposed in a draft. Note that another al= gorithm was presented during the LSR virtual interim which replaced IETF 10= 7. =C2=A0

=C2=A0

In my opinion it may not = be a bad idea even to combine both drafts so the solution is complete and h= olistic.=C2=A0 This will also make the overall specification flow nicely. = =C2=A0

=C2=A0

No =E2=80=93 we=E2=80=99re not going to do this. =

=C2=A0

Thanks,

Acee

=C2=A0

I know that efforts were = made by LSR to have a common IGP solution, however there are many inherent = differences between ISIS and OSPF that from IGP Link state protocol perspec= tive you can treat like apples to apples but really it=E2=80=99s apples and oranges.=C2=A0 Maybe it might we wise t= o have separate draft for both and have references linking together as the = same algorithm concept and mathematically however the actual code implement= ation would vary as the LSDB link state data structures are completely different.=C2=A0

=C2=A0

Later =3D Dynamic floodin= g =3D 2 modes Centralized leader based and distributed=C2=A0<= /p>

=C2=A0

This later draft per sect= ion excerpt provides both centralized and distributed algorithm see below= =C2=A0

=C2=A0

6.4.=C2=A0 Area Leader Responsibilities=

=C2=A0
=C2=
=A0=C2=A0 If the Area Leader operates in centralized mode, it MUST advertis=
e
=C2=
=A0=C2=A0 algorithm 0 in its Area Leader Sub-TLV.=C2=A0 In order for Dynami=
c
=C2=
=A0=C2=A0 Flooding to be enabled it also MUST compute and advertise a flood=
ing=

=C2=
=A0=C2=A0 topology for the area.=C2=A0 The Area Leader may update the flood=
ing=

=C2=
=A0=C2=A0 topology at any time, however, it should not destabilize the netw=
ork=

=C2=
=A0=C2=A0 with undue or overly frequent topology changes.=C2=A0 If the Area=
 Leader
=C2=
=A0=C2=A0 operates in centralized mode and needs to advertise a new floodin=
g
=C2=
=A0=C2=A0 topology, it floods the new flooding topology on both the new and=
 old
=C2=
=A0=C2=A0 flooding topologies.
=C2=A0
=C2=
=A0=C2=A0 If the Area Leader operates in distributed mode, it MUST advertis=
e a=

=C2=
=A0=C2=A0 non-zero algorithm in its Area Leader Sub-TLV.=

=C2=A0
=C2=
=A0=C2=A0 When the Area Leader advertises algorithm 0 in its Area Leader Su=
b-<=
u>
=C2=
=A0=C2=A0 TLV and does not advertise a flooding topology, Dynamic Flooding =
is<=
u>
=C2=
=A0=C2=A0 disabled for the area.=C2=A0 Note this applies whether the Area L=
eader=C2=
=A0=C2=A0 intends to operate in centralized mode or in distributed mode.
=C2=A0
=C2=
=A0=C2=A0 Note that once Dynamic Flooding is enabled, disabling it risks
=C2=
=A0=C2=A0 destabilizing the network.
=C2=A0
6.5.=C2=A0 Distributed Flooding Topology Calculation<=
u>
=C2=A0
=C2=
=A0=C2=A0 If the Area Leader advertises a non-zero algorithm in its Area Le=
ader
=C2=
=A0=C2=A0 Sub-TLV, all nodes in the area that support Dynamic Flooding and =
the=

=C2=
=A0=C2=A0 value of algorithm advertised by the Area Leader MUST compute the=
=

=C2=
=A0=C2=A0 flooding topology based on the Area Leader's advertised algor=
ithm.=C2=A0
=C2=
=A0=C2=A0 Nodes that do not support the value of algorithm advertised by th=
e
=C2=
=A0=C2=A0 Area Leader MUST continue to use standard flooding mechanism as
=C2=
=A0=C2=A0 defined by the protocol.
=C2=A0
=C2=
=A0=C2=A0 Nodes that do not support the value of algorithm advertised by th=
e
=C2=
=A0=C2=A0 Area Leader MUST be considered as Dynamic Flooding incapable node=
s by
=C2=
=A0=C2=A0 the Area Leader.
=C2=A0
=C2=
=A0=C2=A0 If the value of the algorithm advertised by the Area Leader is fr=
om<=
u>
=C2=
=A0=C2=A0 the range 128-254 (private distributed algorithms), it is the res=
ponsibility of the=C2=A0
network operator to guarantee that all nodes in the are=
a have a common understanding of what the given algorithm value represents.=
=

=C2=A0

Former =3D WG LC=C2=A0=

Provides algorithm for di= stributed mode for this draft as well as the algorithm to be used for distr= ibuted mode later dynamic flooding draft=C2=A0

=C2=A0

Separate question-=

=C2=A0

In light of the flooding = algorithm and seeing that at the bottom of section 6.5 mentions flooding al= gorithm are the IANA codepoints reserved for flooding unique and non overla= pping with the flex algo codepoints I believe 0-127.=C2=A0 I would think the flooding algorithm range of value= s is completely separate since a different function then flex algo values.<= u>

=C2=A0

=

=C2=A0


To: Huaimo Chen <huaimo.chen@futurewei.com>
Cc: Acee Lindem (acee) <acee=3D40cisco.com@dmarc.ietf.org>; lsr@ietf.org <lsr@ietf.org>
Subject: Re: [Lsr] Flooding Topology Computation Algorithm - draft-c= c-lsr-flooding-reduction-08 Working Group Adoption Call

=C2=A0

=C2=A0

=C2=A0

On Wed, May 20, 2020 at 1= 1:59 PM Huaimo Chen <huaimo.chen@futurewei.com> wrote:

Hi Gyan,

=C2=A0

=C2=A0 =C2=A0 Thanks much for your questions. My answer= s are inline below with [HC].

=C2=A0

<= /div>
<= div>

Best Regards,

Huaimo

From: Gyan Mishra <hayabusagsm@gmail.com>
Sent: Wednesday, May 20, 2020 11:14 AM
To: Huaimo Chen <huaimo.chen@futurewei.com>
Cc: Acee Lindem (acee) <acee=3D40cisco.com@dmarc.ietf.org>; lsr@ietf.org <lsr@ietf.org>
Subject: Re: [Lsr] Flooding Topology Computation Algorithm - draft-c= c-lsr-flooding-reduction-08 Working Group Adoption Call

=C2=A0

<= /div>

Huaimo=C2=A0

=C2=A0

This is a much needed fea= ture that operators have been needing for densely meshed topologies that co= mmonly exist in data centers to accommodate very high bandwidth E-W traffic= .

[HC]: Thank you very much= .

=C2=A0

Below is link from Cisco = which has introduced feature for dynamic flooding in clos high density ECMP= data center topologies.

=C2=A0

Please look at the featur= e description and it does seem to be exactly the same as this draft.=C2=A0 = Please confirm.=C2=A0

[HC]: It seems different.= =C2=A0

=C2=A0

There maybe other vendors= due to industry demand have to get the feature deployed before it reaches = standards vendor consensus with the IETF.

=C2=A0

<= /div>
<= div class=3D"m_2130119924291467262WordSection1">
=
<= /div>

=C2=A0

We are testing this featu= re and planning to deploy but wanted to ensure that this is the same as the= draft on the standards track.

[HC]: The feature appears implemented draft "Dynamic Flooding on Dense Graph= s", which does not include any flooding topology computation algorithm= ..=C2=A0

<= /div>

=C2=A0

=C2=A0 =C2=A0 Gyan> Ho= w does this draft compare to the WG LC draft for flood reduction.=C2=A0 Wou= ld they be two eventual standard options in the operators toolbox =C2=A0or = competing features for optimized flood reduction. Would having two flood reduction features standardized versus one default IGP flood red= uction feature be confusing for operators.=C2=A0 Just as it was confusing t= o me.

=C2=A0

=C2=A0

Kind regards=C2=A0=

=C2=A0

Gyan

=C2=A0

=C2=A0

=
<= div>

On Tue, May 19, 2020 at 1= 1:52 PM Huaimo Chen <huaimo.chen@futurewei.com> wrote:

=

Hi Gyan,

=C2=A0

=C2=A0 =C2=A0 = Thank you very much for your questions and support.

=C2=A0

=C2=A0 =C2=A0 = This Flooding Topology Computation algorithm can be used in the Dynamic Flooding on Dense Graphs to compute t= he flooding topologies for the=C2=A0data center clos dense meshed topologie= s with many ECMP paths. It can be used by the area leader in the centralize= d mode to compute the flooding topology. =C2=A0=C2=A0=

=C2=A0

Best Regards,<= /span>

Huaimo<= span style=3D"font-size:12.0pt;color:black">

From: Lsr <lsr-bounces@ietf.org> on b= ehalf of Gyan Mishra <hayabusagsm@gmail.com>
Sent: Tuesday, May 19, 2020 2:39 AM
To: Yanhe Fan <yfan@casa-systems.com>
Cc: lsr@ietf.org <lsr@ietf.org&g= t;; Acee Lindem (acee) <acee=3D40cisco.com@dmarc.ietf.org>
Subject: Re: [Lsr] Flooding Topology Computation Algorithm - draft-c= c-lsr-flooding-reduction-08 Working Group Adoption Call

=C2=A0

<= /div>
=


On Apr 29, 2020, at 7:26 AM, Acee Lindem (acee) <acee=3D40cisco.com@dmarc.ietf.org> wrote:

Hi = Mohit, 
 
From: Mohit Sethi M <mohit.m.sethi@ericsson.com>
Date: Wednesday, April 29, = 2020 at 2:29 AM
To: Acee Lindem <acee@cisco.com>, "gen-art@ietf.org" <gen-art@ietf.org>
Cc: "lsr@ietf.org" <lsr@ietf.org>, "draft-ietf-isis-mpls-elc.all@ietf.org" <draft-ietf-isis-mpls-elc.all@ietf.org>, "last-call@ietf.org" <last-call@ietf.org>
Subject: Re: Genart last call = review of draft-ietf-isis-mpls-elc-11
 

HI Acee,

On 4/24/20 3:38 PM, Acee Lindem (acee) wrote:
Hi Mohit,
 
Speaking as document shepherd. See inline. 
 
On 4/24/20, 3:39 AM, "Mohit Sethi via Datatracker" <noreply@ietf.org> wrote:
 
    Reviewer: Mohit Sethi
    Review result: Ready with Nits
 
    I am the assigned Gen-ART reviewer for =
this draft. The General Area
    Review Team =
(Gen-ART) reviews all IETF documents being processed
    by the IESG for the IETF Chair.  =
Please treat these comments just
    like any other =
last call comments.
 
    For more =
information, please see the FAQ at
 
    <https://trac.ietf.org/trac/gen/wiki/GenArtfaq>.
 
    Document: draft-ietf-isis-mpls-elc-11
    Reviewer: Mohit Sethi
    Review Date: 2020-04-24
    IETF LC End Date: 2020-05-05
    IESG Telechat date: Not scheduled for a =
telechat
 
    Summary: This document =
specifies how Entropy Label Capability (ELC) and Entropy
    Readable Label Depth (ERLD) are advertised =
using IS-IS. For advertising ELC, a
    flag in the =
Prefix Attribute Flags is used. For advertising ERLD, a Node MSD
    Advertisement is used.
 
    Major issues:
 
    Minor issues: The document is short and =
straightforward. For someone like me
    who is not =
familiar with the routing area, would it make sense to explain why
    signalling ELC information with MPLS is =
not sufficient (or what are the
    benefits of =
advertising with IS-IS)?
 
I guess I'm wondering what you mean =
"signaling ELC information with MPLS"? With segment routing, the IGPs =
can be the only choice for signaling ELC capability. I don=E2=80=99t =
believe this comment requires any action.

I hope that you don't expect a gen-art reviewer to be an = expert on every topic. I certainly am NOT on expert on routing. I = interpreted the following text in the draft:

It also
   introduces the concept =
of Entropy Label Capability (ELC) and defines
   the signaling of this capability via MPLS =
signaling protocols.
to imply that signaling ELC information = with MPLS is possible but this draft defines a mechanism for signaling = the same information with IS-IS. Maybe the need for this is very obvious = for those in the routing domain in which case ignoring my comment is = perfectly fine. 
 
Even = though you are not an expert on routing, you should realize that =E2=80=9C= with MPLS=E2=80=9D and =E2=80=9Cvia MPLS signaling protocols=E2=80=9D = have very different connotations. If you reference section 3 of the = reference document [RFC6790], you=E2=80=99ll the MPLS signaling = protocols currently supporting ELC signaling. As I stated previously, = with segment routing none of these protocols are required for = deployment.
 
Thanks,
Acee

--Mohit

 
Thanks,
Acee
 
 
    Nits/editorial =
comments:
 
    In section 3, "used as the =
ECL  Flag" should perhaps be "used as the ELC Flag"?
    In section 4, "IANA for EARLD-MSD" should =
perhaps be "IANA for ERLD-MSD"?
    In section 6, =
"ECL Flag (E-flag)." should perhaps be "ELC Flag (E-flag)."?
 
 
 
_______________________________________________
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Gen-art@ietf.org
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=C2=A0

I support WG adoption and= have a few questions related to the draft.

=C2=A0

Does this flooding algori= thm use the dynamic flooding algorithm used in data center clos dense meshe= d topologies with many ECMP paths where the flood is decoupled from the phy= sical topology.=C2=A0 In the dynamic flooding algorithm mentioned in centralized mode the flooding is computed by the ar= ea leader and distributed to all nodes.=C2=A0 In distributed mode each mode= the area leader determines the algorithm and then each node computes the f= looding topology based on the algorithm. =C2=A0

=C2=A0

This dynamic algorithm fo= r optimized flood reduction would reduce the amount of redundant flooding i= n highly densely meshed ospf or Isis topologies.=C2=A0 So this optimization= of flooding would improving overall link state routing protocol convergence.

=C2=A0

Gyan=C2=A0<= /p>

=C2=A0

On Mon, May 18, 2020 at 3= :37 PM Yanhe Fan <yfan@casa-systems.com> wrote:

Support it as a co-author.

=C2=A0

Thanks,

Yanhe

_________________________= ______________________
Lsr mailing list
Lsr@ietf.org
https://www= .ietf.org/mailman/listinfo/lsr

--

<= /div>
<= div>

Gya= n Mishra

Networ= k Solutions Architect=C2=A0=

M 301 = 502-1347
1= 3101 Columbia Pike=C2=A0
Silver Spring, MD

=C2=A0

--

= 3D"Image

Gya= n Mishra

Networ= k Solutions Architect=C2=A0=

M 301 = 502-1347
131= 01 Columbia Pike=C2=A0
Silver Spring, MD

=C2=A0

--

Gya= n Mishra

Networ= k Solutions Architect=C2=A0=

M = 301 502-1347
13101 Colum= bia Pike=C2=A0
Silver Spring, MD

=C2=A0

--

3D"Image

=

Gya= n Mishra

Networ= k Solutions Architect=C2=A0=

M = 301 502-1347
13101 Columbia Pike=C2=A0=
Silver Spring, MD

=C2=A0

--
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:message-id:subject:to:cc; bh=V0xDwztPXWq+x96wm51+2OrFaaIlgu0M6bRVHSM0RTE=; b=dmfSiFkpK5z9t/cdF1YUs7AADYWBtAIXQMdinlT1BrwRVLXUkKXM8VD+k+h6r37VdC p/SD/pfaIN6R4rtnVmDaMld0kSGnsMO6knxwAU4VTV8+xbQRs7pJtAq9dRc1C8aqWdQ9 Tm2iE5Y8cbmU82sU8/eOPVWzgCFGXaRAQsLxJ5Km/FOWxGqHCOKdBKykymW3PcIZOWF0 rI4WR7qeVHckKYPeVIxXhJoPOzKh2xlzkEnsEnvlADD5s3zic6TwgDQBHP93aIgXsFWW TTu3YDxoV9EPilZlDcc1CMEbsZXx6t7Yp5pql62X3PQFOd/c7PBasK1XGY3fAoY4bzSN aJ8g== X-Gm-Message-State: AOAM5336aMpT0V5W565eVO/SnhuJeVVyhA6m/l3qemdmlGN7xOQhRDCt xbRTtDNOBhkhrBofPFWyTfDeWjDbozOHbmITAIJxiTwnaIE= X-Google-Smtp-Source: ABdhPJzSM53eL/6tu5qcimBgEvbNPW7KUgpzu6EpMbYNsiwJNebwGv1ksUOc7l+Dtj/zziyr5WH/jcfjeRaf2kdLg50= X-Received: by 2002:a92:b11:: with SMTP id b17mr11282561ilf.257.1590113640669; Thu, 21 May 2020 19:14:00 -0700 (PDT) MIME-Version: 1.0 References: <63330FD6-EDE8-4938-AA85-948279C57E34@cisco.com> <424B17B1-D66D-4708-A819-855E972841AF@cisco.com> In-Reply-To: From: Gyan Mishra Date: Thu, 21 May 2020 22:13:49 -0400 Message-ID: To: "Acee Lindem (acee)" Cc: Huaimo Chen , "lsr@ietf.org" Content-Type: multipart/alternative; boundary="000000000000b4680c05a6332e55" Archived-At: Subject: Re: [Lsr] Flooding Topology Computation Algorithm - draft-cc-lsr-flooding-reduction-08 Working Group Adoption Call X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 22 May 2020 02:14:06 -0000 --000000000000b4680c05a6332e55 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable I think for both drafts it would be good to have a stick diagram at a minimum. I majored in EE with math minor and both drafts are hard to follow without a diagram with labels showing the exact topology examples. Four main topologies - full mesh, partial mesh and leaf spine ( 2 tier) and CLOS ( 3 tier) - real world scenario=E2=80=99s. >From the interim meeting was their a slide deck visual topology shared? That would help. https://datatracker.ietf.org/doc/html/draft-cc-lsr-flooding-reduction-08 4.1 Step 1 - Build Cq candidate queue For each node B on FT whose D is one (from minimum to maximum node ID), find a link L attached to B such that L's remote node R has minimum D and ID, add link L between B and R into FT and increase B's D and R's D by one. Return FT. My interpretation is the algorithm an iterative loop and starts with any node in the candidate list so could start from edge and work left to right or vice versa. For loop to build FT from Cq =3D with each node B with directly attached node R via link L. Increment node B from Cq until the FT is build for all nodes. Instead of starting with a wide diameter FT matching physical topology we start micro topology with D=3D1 and go node b= y node. 4.2 1. Finding and removing the first element with node A in Cq that is not on FT and one PH's D in PHs < MaxD and PH's D < PH's ConMaxD. If A is root R0, then add the element into FT otherwise (i.e., A !=3D R0 with one PH's D in PHs < MaxD and PH's D < PH's ConMaxD. Assume that PH is the first one in PHs whose D < MaxD and PH's D < PH's ConMaxD), PH's D++, and add A with D =3D 1 and PHs =3D {PH} into FT. Note: if there is no element with a node in Cq satisfying the conditions, then algorithm may be restarted from R0, ++MaxD, Cq =3D {(R0,D=3D0,PHs =3D { })}, FT =3D { }; This is similar to 4.1 with micro topology with 2 directly connected nodes https://www.ietf.org/id/draft-chen-lsr-dynamic-flooding-algorithm-00.html My interpretation of the algorithm from the verbiage. So this draft starts in the middle of the topology and is geared towards leaf spine 2 or 3 tier clos topology. For this one we build the bi graph so that could be leaf connected to two spines or spine connected to two leafs and iteratively build out the FT topology 3 node arch spine leaf spine or leaf spine leaf. Kind regards Gyan On Thu, May 21, 2020 at 7:01 PM Acee Lindem (acee) wrote: > Hi Gyan, > > > > *From: *Gyan Mishra > *Date: *Thursday, May 21, 2020 at 4:20 PM > *To: *Acee Lindem > *Cc: *Huaimo Chen , "lsr@ietf.org" < > lsr@ietf.org> > *Subject: *Re: [Lsr] Flooding Topology Computation Algorithm - > draft-cc-lsr-flooding-reduction-08 Working Group Adoption Call > > > > > > Yes and I have started reviewing the LSR mail archives as I am late in th= e > discussion for this. > > > > If you have link to any particular dates in the archives would be helpful= . > > > > No =E2=80=93 it was more an =E2=80=9Cevolution=E2=80=9D than an =E2=80=9C= epiphany=E2=80=9D. > > > > That sums up all the questions I have so if all answered in the archives > then I am all set. > > > > I support the draft moving forward as flood reduction is a much needed > feature. > > > > I think overall both drafts will really help large data centers with any > overlay underlay vxlan spine leaf meshed CLOS highly meshed topology that > scales out horizontally with a large spine footprint - this is a much muc= h > needed feature. This also helps eliminate complexity of the workaround o= f > using BGP in the underlay which to me adds tremendous complexity. > > > > Here is the other recently presented dynamic flooding draft. > > > > https://datatracker.ietf.org/doc/draft-chen-lsr-dynamic-flooding-algorith= m/ > > > > You can see they both make use of the dynamic flooding infra in > https://datatracker.ietf.org/doc/draft-ietf-lsr-dynamic-flooding/ > > > > Thanks, > > Acee > > > > > > > > > > Kind regards > > > > Gyan > > > > On Thu, May 21, 2020 at 4:07 PM Acee Lindem (acee) wrote= : > > Speaking as WG Co-chair: > > > > Hi Gyan, > > > > I guess you=E2=80=99ve joined this discussion late. It might be a good id= ea to > review the LSR mailing list archives. > > > > *From: *Gyan Mishra > *Date: *Thursday, May 21, 2020 at 1:51 PM > *To: *Huaimo Chen > *Cc: *Acee Lindem , "lsr@ietf.org" > *Subject: *Re: [Lsr] Flooding Topology Computation Algorithm - > draft-cc-lsr-flooding-reduction-08 Working Group Adoption Call > > > > > > > > On Thu, May 21, 2020 at 11:01 AM Huaimo Chen > wrote: > > Hi Gyan, > > > > Thanks much for your questions. > > > > Gyan> How does this draft compare to the WG LC draft for flood > reduction. Would they be two eventual standard options in the operators > toolbox or competing features for optimized flood reduction. Would havin= g > two flood reduction features standardized versus one default IGP flood > reduction feature be confusing for operators. Just as it was confusing t= o > me. > > https://datatracker.ietf.org/doc/draft-ietf-lsr-dynamic-flooding/ > > > > > [HC]: This draft plus the draft for flooding reduction can provide tw= o > modes of flooding reductions (i.e., centralized mode and distributed mode= ). > The latter describes the two modes, but does not include any flooding > topology computation algorithm for the distributed mode. The former > proposes a flooding topology computation algorithm to be used in the > distributed mode. > > > > Gyan> It maybe a good idea for both documents to reference each other > as to how they play together or in some respects if any provide a > homogeneous complete holistic solution for flooding problem being solved. > > > > It is a good idea to have this new draft reference the dynamic-flooding > but not vice-versa. The existing dynamic flooding draft provides a > framework for any dynamic flooding algorithm that provides a separate > flooding topology. This algorithm is just the first to be formally propos= ed > in a draft. Note that another algorithm was presented during the LSR > virtual interim which replaced IETF 107. > > > > In my opinion it may not be a bad idea even to combine both drafts so the > solution is complete and holistic. This will also make the overall > specification flow nicely. > > > > No =E2=80=93 we=E2=80=99re not going to do this. > > > > Thanks, > > Acee > > > > I know that efforts were made by LSR to have a common IGP solution, > however there are many inherent differences between ISIS and OSPF that fr= om > IGP Link state protocol perspective you can treat like apples to apples b= ut > really it=E2=80=99s apples and oranges. Maybe it might we wise to have s= eparate > draft for both and have references linking together as the same algorithm > concept and mathematically however the actual code implementation would > vary as the LSDB link state data structures are completely different. > > > > Later =3D Dynamic flooding =3D 2 modes Centralized leader based and > distributed > > > > https://datatracker.ietf.org/doc/draft-ietf-lsr-dynamic-flooding/ > > > > This later draft per section excerpt provides both centralized and > distributed algorithm see below > > > > *6.4 . Area Leader Responsibilities* > > > > If the Area Leader operates in centralized mode, it MUST advertise > > algorithm 0 in its Area Leader Sub-TLV. In order for Dynamic > > Flooding to be enabled it also MUST compute and advertise a flooding > > topology for the area. The Area Leader may update the flooding > > topology at any time, however, it should not destabilize the network > > with undue or overly frequent topology changes. If the Area Leader > > operates in centralized mode and needs to advertise a new flooding > > topology, it floods the new flooding topology on both the new and old > > flooding topologies. > > > > If the Area Leader operates in distributed mode, it MUST advertise a > > non-zero algorithm in its Area Leader Sub-TLV. > > > > When the Area Leader advertises algorithm 0 in its Area Leader Sub- > > TLV and does not advertise a flooding topology, Dynamic Flooding is > > disabled for the area. Note this applies whether the Area Leader > > intends to operate in centralized mode or in distributed mode. > > > > Note that once Dynamic Flooding is enabled, disabling it risks > > destabilizing the network. > > > > *6.5 . Distributed Flooding Topology Calculation* > > > > If the Area Leader advertises a non-zero algorithm in its Area Leader > > Sub-TLV, all nodes in the area that support Dynamic Flooding and the > > value of algorithm advertised by the Area Leader MUST compute the > > flooding topology based on the Area Leader's advertised algorithm. > > > > Nodes that do not support the value of algorithm advertised by the > > Area Leader MUST continue to use standard flooding mechanism as > > defined by the protocol. > > > > Nodes that do not support the value of algorithm advertised by the > > Area Leader MUST be considered as Dynamic Flooding incapable nodes by > > the Area Leader. > > > > If the value of the algorithm advertised by the Area Leader is from > > the range 128-254 (private distributed algorithms), it is the responsi= bility of the > > network operator to guarantee that all nodes in the area have a common un= derstanding of what the given algorithm value represents. > > > > Former =3D WG LC > > https://datatracker.ietf.org/doc/html/draft-cc-lsr-flooding-reduction-08 > > > > Provides algorithm for distributed mode for this draft as well as the > algorithm to be used for distributed mode later dynamic flooding draft > > > > Separate question- > > > > In light of the flooding algorithm and seeing that at the bottom of > section 6.5 mentions flooding algorithm are the IANA codepoints reserved > for flooding unique and non overlapping with the flex algo codepoints I > believe 0-127. I would think the flooding algorithm range of values is > completely separate since a different function then flex algo values. > > > > https://datatracker.ietf.org/doc/html/draft-ietf-lsr-flex-algo-07 > > > > > > Best Regards, > > Huaimo > ------------------------------ > > *From:* Gyan Mishra > *Sent:* Thursday, May 21, 2020 10:36 AM > > > *To:* Huaimo Chen > *Cc:* Acee Lindem (acee) ; lsr@ietf.or= g < > lsr@ietf.org> > *Subject:* Re: [Lsr] Flooding Topology Computation Algorithm - > draft-cc-lsr-flooding-reduction-08 Working Group Adoption Call > > > > > > > > On Wed, May 20, 2020 at 11:59 PM Huaimo Chen > wrote: > > Hi Gyan, > > > > Thanks much for your questions. My answers are inline below with [HC]= . > > > > Best Regards, > > Huaimo > ------------------------------ > > *From:* Gyan Mishra > *Sent:* Wednesday, May 20, 2020 11:14 AM > *To:* Huaimo Chen > *Cc:* Acee Lindem (acee) ; lsr@ietf.or= g < > lsr@ietf.org> > *Subject:* Re: [Lsr] Flooding Topology Computation Algorithm - > draft-cc-lsr-flooding-reduction-08 Working Group Adoption Call > > > > Huaimo > > > > This is a much needed feature that operators have been needing for densel= y > meshed topologies that commonly exist in data centers to accommodate very > high bandwidth E-W traffic. > > [HC]: Thank you very much. > > > > Below is link from Cisco which has introduced feature for dynamic floodin= g > in clos high density ECMP data center topologies. > > > > Please look at the feature description and it does seem to be exactly the > same as this draft. Please confirm. > > [HC]: It seems different. > > > > There maybe other vendors due to industry demand have to get the feature > deployed before it reaches standards vendor consensus with the IETF. > > > > > https://www.cisco.com/c/en/us/products/collateral/switches/nexus-9000-ser= ies-switches/white-paper-c11-743015.html > > > > > We are testing this feature and planning to deploy but wanted to ensure > that this is the same as the draft on the standards track. > > [HC]: The feature appears implemented draft "Dynamic Flooding on Dense > Graphs", which does not include any flooding topology computation > algorithm.. > > > > Gyan> How does this draft compare to the WG LC draft for flood > reduction. Would they be two eventual standard options in the operators > toolbox or competing features for optimized flood reduction. Would havin= g > two flood reduction features standardized versus one default IGP flood > reduction feature be confusing for operators. Just as it was confusing t= o > me. > > > > > > https://datatracker.ietf.org/doc/draft-ietf-lsr-dynamic-flooding/ > > > > > Kind regards > > > > Gyan > > > > > > On Tue, May 19, 2020 at 11:52 PM Huaimo Chen > wrote: > > Hi Gyan, > > > > Thank you very much for your questions and support. > > > > This Flooding Topology Computation algorithm can be used in the > Dynamic Flooding on Dense Graphs to compute the flooding topologies for > the data center clos dense meshed topologies with many ECMP paths. It can > be used by the area leader in the centralized mode to compute the floodin= g > topology. > > > > Best Regards, > > Huaimo > ------------------------------ > > *From:* Lsr on behalf of Gyan Mishra < > hayabusagsm@gmail.com> > *Sent:* Tuesday, May 19, 2020 2:39 AM > *To:* Yanhe Fan > *Cc:* lsr@ietf.org ; Acee Lindem (acee) 40cisco.com@dmarc.ietf.org> > *Subject:* Re: [Lsr] Flooding Topology Computation Algorithm - > draft-cc-lsr-flooding-reduction-08 Working Group Adoption Call > > > > > > I support WG adoption and have a few questions related to the draft. > > > > Does this flooding algorithm use the dynamic flooding algorithm used in > data center clos dense meshed topologies with many ECMP paths where the > flood is decoupled from the physical topology. In the dynamic flooding > algorithm mentioned in centralized mode the flooding is computed by the > area leader and distributed to all nodes. In distributed mode each mode > the area leader determines the algorithm and then each node computes the > flooding topology based on the algorithm. > > > > This dynamic algorithm for optimized flood reduction would reduce the > amount of redundant flooding in highly densely meshed ospf or Isis > topologies. So this optimization of flooding would improving overall lin= k > state routing protocol convergence. > > > > Gyan > > > > On Mon, May 18, 2020 at 3:37 PM Yanhe Fan wrote: > > Support it as a co-author. > > > > Thanks, > > Yanhe > > > > *From:* Lsr *On Behalf Of *Acee Lindem (acee) > *Sent:* Friday, May 15, 2020 3:40 PM > *To:* lsr@ietf.org > *Subject:* [Lsr] Flooding Topology Computation Algorithm - > draft-cc-lsr-flooding-reduction-08 Working Group Adoption Call > > > > This begins a 3 week (due to holidays) WG adoption call for the =E2=80=9C= Flooding > Topology Computation Algorithm=E2=80=9D draft. Please issue your support = or > objection to this list by 11:59 PM, UTC on June 5th, 2020. Here is a URL > for your convenience. > > > > https://datatracker.ietf.org/doc/draft-cc-lsr-flooding-reduction/ > > > > > Thanks, > Acee > > _______________________________________________ > Lsr mailing list > Lsr@ietf.org > https://www.ietf.org/mailman/listinfo/lsr > > > -- > > *Error! Filename not specified.* > > > *Gyan > Mishra* > > > *Network > Solutions Architect * > > > > *M 301 502-1347 13101 Columbia Pike > > *Silver Spring, MD > > > > > -- > > *Error! Filename not specified.* > > > *Gyan Mishra* > > *Network Solutions Architect * > > > > *M 301 502-1347 > 13101 > Columbia Pike > > *Silver Spring, MD > > > > > -- > > *Error! Filename not specified.* > > > *Gyan Mishra* > > *Network Solutions Architect * > > > > *M 301 502-1347 13101 Columbia Pike > > *Silver Spring, MD > > > > > > > -- > > *Error! Filename not specified.* > > *Gyan Mishra* > > *Network Solutions Architect * > > > > *M 301 502-1347 13101 Columbia Pike > > *Silver Spring, MD > > > > > > > -- > > [image: Image removed by sender.] > > *Gyan Mishra* > > *Network Solutions Architect * > > > > *M 301 502-1347 13101 Columbia Pike > > *Silver Spring, MD > > > > > > --=20 *Gyan Mishra* *Network Solutions A**rchitect * *M 301 502-134713101 Columbia Pike *Silver Spring, MD --000000000000b4680c05a6332e55 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable

I think for both drafts it would be good t= o have a stick diagram at a minimum. =C2=A0
For each no=
de B on FT whose D is one (from minimum to maximum
       node ID), find a link L attached to B such that L's remote node =
R
       has minimum D and ID, add link L between B and R into FT and
       increase B's D and R's D by one.  Return FT.
My interpretation is the algorithm an iterative loop and star= ts with any node in the candidate list so could start from edge and work le= ft to right or vice versa.=C2=A0 For loop to build FT from Cq =3D with each= node B with directly attached node R via link L.=C2=A0 Increment node B fr= om Cq until the FT is build for all nodes.=C2=A0 Instead of starting with a= wide diameter FT matching physical topology we start micro topology with D= =3D1 and go node by node.

4.2=C2=A0

1.  Finding and removing the first element with node A in Cq th=
at is
       not on FT and one PH's D in PHs < MaxD and PH's D < PH=
's ConMaxD.

       If A is root R0, then add the element into FT

       otherwise  (i.e., A !=3D R0 with one PH's D in PHs < MaxD and=
 PH's
          D < PH's ConMaxD.  Assume that PH is the first one in PHs
          whose D < MaxD and PH's D < PH's ConMaxD), PH's=
 D++, and add A
          with D =3D 1 and PHs =3D {PH} into FT.

       Note:  if there is no element with a node in Cq satisfying the
          conditions, then algorithm may be restarted from R0, ++MaxD,
          Cq =3D {(R0,D=3D0,PHs =3D { })}, FT =3D { };
This is similar to 4.1 with micro topology with 2 directly connec= ted nodes=C2=A0

My interpretation of the algori= thm from the verbiage.

S= o this draft starts in the middle of the topology and is geared towards lea= f spine 2 or 3 tier clos topology.

For this one we build the bi graph so that could be leaf connect= ed to two spines or spine connected to two leafs and iteratively build out = the FT topology 3 node arch =C2=A0spine leaf spine or leaf spine leaf.

Kind regards=C2=A0

Gyan

On Thu, May 21, 2020 at = 7:01 PM Acee Lindem (acee) <acee@cisco= .com> wrote:

Hi Gyan,

=C2=A0

From: Gyan Mishra <hayabusagsm@gmail.com= >
Date: Thursday, May 21, 2020 at 4:20 PM
To: Acee Lindem <acee@cisco.com>
Cc: Huaimo Chen <huaimo.chen@futurewei.com>, "lsr@ietf.org" <lsr@ietf.org>
Subject: Re: [Lsr] Flooding Topology Computation Algorithm - draft-c= c-lsr-flooding-reduction-08 Working Group Adoption Call

=C2=A0

=C2=A0

Yes and I have started r= eviewing the LSR mail archives as I am late in the discussion for this.<= /u>

=C2=A0

If you have link to any = particular dates in the archives would be helpful.

=C2=A0

No =E2=80=93 it was more an =E2=80=9Cevolution=E2=80= =9D than an =E2=80=9Cepiphany=E2=80=9D.

=C2=A0

That sums up all the que= stions I have so if all answered in the archives then I am all set.<= u>

=C2=A0

I support the draft movi= ng forward as flood reduction is a much needed feature. =C2=A0

=C2=A0

I think overall both dra= fts will really help large data centers with any overlay underlay vxlan spi= ne leaf meshed CLOS highly meshed topology that scales out horizontally wit= h a large spine footprint - this is a much much needed feature.=C2=A0 This also helps eliminate complexity of th= e workaround of using BGP in the underlay which to me adds tremendous compl= exity.

=C2=A0

Here is the other recently presented dynamic floodin= g draft.

=C2=A0

https://datatracker.i= etf.org/doc/draft-chen-lsr-dynamic-flooding-algorithm/

=C2=A0

You can see they both make use of the dynamic floodi= ng infra in https://datatracker.ietf.org/doc/draft-ietf-lsr-dynami= c-flooding/

=C2=A0

Thanks,

Acee

=C2=A0

=C2=A0

=C2=A0

=C2=A0

Kind regards=C2=A0

=C2=A0

Gyan=C2=A0=

=C2=A0

On Thu, May 21, 2020 at = 4:07 PM Acee Lindem (acee) <acee@cisco.com> wrote:

=
=

Speaking as WG Co-chair:

=C2=A0

Hi Gyan,

=C2=A0

I guess you=E2=80=99ve joined this discussion late. It might be a good idea= to review the LSR mailing list archives.

=C2=A0

From: Gyan Mishra <hayabusagsm@gmail.com>
Date: Thursday, May 21, 2020 at 1:51 PM
To: Huaimo Chen <huaimo.chen@futurewei.com>
Cc: Acee Lindem <acee@cisco.com>, "lsr@ietf.org" <lsr@ietf.org>
Subject: Re: [Lsr] Flooding Topology Computation Algorithm - draft-c= c-lsr-flooding-reduction-08 Working Group Adoption Call

=C2=A0

=C2=A0

=C2=A0

On Thu, May 21, 2020 at 11:01 AM Huaimo Chen <huaimo.chen@futurewei.com> wrot= e:

Hi Gyan,

=C2=A0

=C2=A0 =C2=A0 Thanks much for yo= ur questions.

=C2=A0

=C2=A0Gyan> How does this dra= ft compare to the WG LC draft for flood reduction.=C2=A0 Would they be two = eventual standard options in the operators toolbox =C2=A0or competing featu= res for optimized flood reduction. Would having two flood reduction features standardized versus one default IGP flood reducti= on feature be confusing for operators.=C2=A0 Just as it was confusing to me= .=C2=A0

=C2=A0

=C2=A0 =C2=A0 [HC]: This draft p= lus the draft for flooding reduction can provide two modes of flooding redu= ctions (i.e., centralized mode and distributed mode). The latter describes = the two modes, but does not include any flooding topology computation algorithm for the distributed mode. The former propos= es a=C2=A0flooding topology computat= ion algorithm to be used in the distributed mode.=C2=A0=C2=A0=

=C2=A0

=C2=A0 =C2=A0Gyan> It maybe a good idea for both documents to reference = each other as to how they play together or =C2=A0in some respects if any pr= ovide a homogeneous complete holistic solution for flooding problem being s= olved. =C2=A0

=C2=A0

It is a good idea to have this new draft reference the dynamic-flooding but= not vice-versa. The existing dynamic flooding draft provides a framework f= or any dynamic flooding algorithm that provides a separate flooding topolog= y. This algorithm is just the first to be formally proposed in a draft. Note that another algorithm was presen= ted during the LSR virtual interim which replaced IETF 107. =C2=A0

=C2=A0

In my opinion it may not be a bad idea even to combine both drafts so the s= olution is complete and holistic.=C2=A0 This will also make the overall spe= cification flow nicely. =C2=A0

=C2=A0

No =E2=80=93 we=E2=80=99re not going to do this.

=C2=A0

Thanks,

Acee

=C2=A0

I know that efforts were made by LSR to have a common IGP solution, however= there are many inherent differences between ISIS and OSPF that from IGP Li= nk state protocol perspective you can treat like apples to apples but reall= y it=E2=80=99s apples and oranges.=C2=A0 Maybe it might we wise to have separate draft for both and have references linki= ng together as the same algorithm concept and mathematically however the ac= tual code implementation would vary as the LSDB link state data structures = are completely different.=C2=A0

=C2=A0

Later =3D Dynamic flooding =3D 2 modes Centralized leader based and distrib= uted=C2=A0

=C2=A0

This later draft per section excerpt provides both centralized and distribu= ted algorithm see below=C2=A0

=C2=A0

=
6.4.=C2=A0 Area=
 Leader Responsibilities
=C2=A0
=C2=A0=C2=A0 If the Area Leader operates in central=
ized mode, it MUST advertise<=
u style=3D"font-family:monospace">
=C2=A0=C2=A0 algorithm 0 in its Area Leader Sub-TLV=
.=C2=A0 In order for Dynamic<=
u style=3D"font-family:monospace">
=C2=A0=C2=A0 Flooding to be enabled it also MUST co=
mpute and advertise a flooding
=C2=A0=C2=A0 topology for the area.=C2=A0 The Area =
Leader may update the flooding
=C2=A0=C2=A0 topology at any time, however, it shou=
ld not destabilize the network
=C2=A0=C2=A0 with undue or overly frequent topology=
 changes.=C2=A0 If the Area Leader
=C2=A0=C2=A0 operates in centralized mode and needs=
 to advertise a new flooding<=
u style=3D"font-family:monospace">
=C2=A0=C2=A0 topology, it floods the new flooding t=
opology on both the new and old
=C2=A0=C2=A0 flooding topologies.
=C2=A0
=C2=A0=C2=A0 If the Area Leader operates in distrib=
uted mode, it MUST advertise a
=C2=A0=C2=A0 non-zero algorithm in its Area Leader =
Sub-TLV.
=C2=A0
=C2=A0=C2=A0 When the Area Leader advertises algori=
thm 0 in its Area Leader Sub-=

=C2=A0=C2=A0 TLV and does not advertise a flooding =
topology, Dynamic Flooding is=

=C2=A0=C2=A0 disabled for the area.=C2=A0 Note this=
 applies whether the Area Leader<=
/u>
=C2=A0=C2=A0 intends to operate in centralized mode=
 or in distributed mode.
=C2=A0
=C2=A0=C2=A0 Note that once Dynamic Flooding is ena=
bled, disabling it risks
=C2=A0=C2=A0 destabilizing the network.

=C2=A0


=
6.5.=C2=A0 Dist=
ributed Flooding Topology Calculation


=C2=A0


=C2=A0=C2=A0 If the Area Leader advertises a non-ze=
ro algorithm in its Area Leader


=C2=A0=C2=A0 Sub-TLV, all nodes in the area that su=
pport Dynamic Flooding and the


=C2=A0=C2=A0 value of algorithm advertised by the A=
rea Leader MUST compute the


=C2=A0=C2=A0 flooding topology based on the Area Le=
ader's advertised algorithm.<=
/u>


=C2=A0


=C2=A0=C2=A0 Nodes that do not support the value of=
 algorithm advertised by the<=
u style=3D"font-family:monospace">


=C2=A0=C2=A0 Area Leader MUST continue to use stand=
ard flooding mechanism as


=C2=A0=C2=A0 defined by the protocol.

=C2=A0


=C2=A0=C2=A0 Nodes that do not support the value of=
 algorithm advertised by the<=
u style=3D"font-family:monospace">


=C2=A0=C2=A0 Area Leader MUST be considered as Dyna=
mic Flooding incapable nodes by


=C2=A0=C2=A0 the Area Leader.


=C2=A0


=C2=A0=C2=A0 If the value of the algorithm advertis=
ed by the Area Leader is from=



=C2=A0=C2=A0 the range 128-254 (private distributed=
 algorithms), it is the responsibility of the=C2=A0


network operator to guarante=
e that all nodes in the area have a common understanding of what the given =
algorithm value represents.


=C2=A0

Former =3D WG LC=C2=A0

Provides algorithm for distributed mode for this draft as well as the algor= ithm to be used for distributed mode later dynamic flooding draft=C2=A0<= /u>

=C2=A0

Separate question-

=C2=A0

In light of the flooding algorithm and seeing that at the bottom of section= 6.5 mentions flooding algorithm are the IANA codepoints reserved for flood= ing unique and non overlapping with the flex algo codepoints I believe 0-12= 7.=C2=A0 I would think the flooding algorithm range of values is completely separate since a different function then fle= x algo values.

=C2=A0

=C2=A0

Best Regards,

Huaimo

From:= Gyan Mishra <hayabusagsm@gmail.com>
Sent: Thursday, May 21, 2020 10:36 AM


To: Huaimo Chen <huaimo.chen@futurewei.com>
Cc: Acee Lindem (acee) <acee=3D40cisco.com@dmarc.ietf.org>; lsr@ietf.org <lsr@ietf.org>
Subject: Re: [Lsr] Flooding Topology Computation Algorithm - draft-c= c-lsr-flooding-reduction-08 Working Group Adoption Call

=C2=A0

=C2=A0

=C2=A0

On Wed, May 20, 2020 at 11:59 PM Huaimo Chen <huaimo.chen@futurewei.com> wrot= e:

Hi Gyan,

=C2=A0

=C2=A0 =C2=A0 Thanks much for yo= ur questions. My answers are inline below with [HC].

=C2=A0

Best Regards,

Huaimo

From:= Gyan Mishra <hayabusagsm@gmail.com>
Sent: Wednesday, May 20, 2020 11:14 AM
To: Huaimo Chen <huaimo.chen@futurewei.com>
Cc: Acee Lindem (acee) <acee=3D40cisco.com@dmarc.ietf.org>; lsr@ietf.org <lsr@ietf.org>
Subject: Re: [Lsr] Flooding Topology Computation Algorithm - draft-c= c-lsr-flooding-reduction-08 Working Group Adoption Call

=C2=A0

Huaimo=C2=A0

=C2=A0

This is a much needed feature that operators have been needing for densely = meshed topologies that commonly exist in data centers to accommodate very h= igh bandwidth E-W traffic.

[HC]: Thank you very much.

=C2=A0

Below is link from Cisco which has introduced feature for dynamic flooding = in clos high density ECMP data center topologies.

=C2=A0

Please look at the feature description and it does seem to be exactly the s= ame as this draft.=C2=A0 Please confirm.=C2=A0

[HC]: It seems different.=C2=A0

=C2=A0

There maybe other vendors due to industry demand have to get the feature de= ployed before it reaches standards vendor consensus with the IETF.

=C2=A0

=C2=A0

We are testing this feature and planning to deploy but wanted to ensure tha= t this is the same as the draft on the standards track.

[HC]: The feature appear= s implemented draft "Dynamic Flooding on Dense Graphs", which doe= s not include any flooding topology computation algorithm..=C2=A0=

=C2=A0

=C2=A0 =C2=A0 Gyan> How does this draft compare to the WG LC draft for f= lood reduction.=C2=A0 Would they be two eventual standard options in the op= erators toolbox =C2=A0or competing features for optimized flood reduction. = Would having two flood reduction features standardized versus one default IGP flood reduction feature be confusing for operators.= =C2=A0 Just as it was confusing to me.

=C2=A0

=C2=A0

Kind regards=C2=A0

=C2=A0

Gyan

=C2=A0

=C2=A0

On Tue, May 19, 2020 at 11:52 PM Huaimo Chen <huaimo.chen@futurewei.com> wrot= e:

Hi = Gyan,

=C2=A0

=C2= =A0 =C2=A0 Thank you very much for your questions and support.

=C2=A0

=C2= =A0 =C2=A0 This Flooding Topology Comput= ation algorithm can be used in the Dynamic Flooding on Dense Graphs to compute the flooding topologies for the=C2=A0data cente= r clos dense meshed topologies with many ECMP paths. It can be used by the = area leader in the centralized mode to compute the flooding topology. =C2= =A0=C2=A0

=C2=A0

Bes= t Regards,

Hua= imo

From:= Lsr <lsr-boun= ces@ietf.org> on behalf of Gyan Mishra <hayabusagsm@gmail.com>
Sent: Tuesday, May 19, 2020 2:39 AM
To: Yanhe Fan <yfan@casa-systems.com>
Cc: lsr@ietf.org <lsr@ietf.org&g= t;; Acee Lindem (acee) <acee=3D40cisco.com@dmarc.ietf.org>
Subject: Re: [Lsr] Flooding Topology Computation Algorithm - draft-c= c-lsr-flooding-reduction-08 Working Group Adoption Call

=C2=A0

=C2=A0

I support WG adoption and have a few questions related to the draft.=

=C2=A0

Does this flooding algorithm use the dynamic flooding algorithm used in dat= a center clos dense meshed topologies with many ECMP paths where the flood = is decoupled from the physical topology.=C2=A0 In the dynamic flooding algo= rithm mentioned in centralized mode the flooding is computed by the area leader and distributed to all nodes.=C2= =A0 In distributed mode each mode the area leader determines the algorithm = and then each node computes the flooding topology based on the algorithm. = =C2=A0

=C2=A0

This dynamic algorithm for optimized flood reduction would reduce the amoun= t of redundant flooding in highly densely meshed ospf or Isis topologies.= =C2=A0 So this optimization of flooding would improving overall link state = routing protocol convergence.

=C2=A0

Gyan=C2=A0

=C2=A0

On Mon, May 18, 2020 at 3:37 PM Yanhe Fan <yfan@casa-systems.com> wrote:

Support it as a co-author.

=C2=A0

Thanks,

Yanhe

_______________________________________________
Lsr mailing list
Lsr@ietf.org
https://www= .ietf.org/mailman/listinfo/lsr

--

Error! Filename not specified.

Gyan Mishra

Network Soluti= ons Architect=C2=A0

M 301 502-1347
13101 Columbia Pike=C2=A0
Silver Spring, MD

=C2=A0

--

Error! Filename not specified.

Gyan Mishra

Network Solutions = Architect=C2=A0

M 301 502-1347
= 13101 Columbia Pike=C2=A0
Silver Spring, MD

=C2=A0

--

<= /div>
=

Gyan Mishra

Network Solutions = Architect=C2=A0

M 301 502-1347
13101 Columbia Pike=C2=A0
Silver Spring, MD

<= a href=3D"https://www.google.com/maps/search/13101+Columbia+Pike+%0D%0A+Sil= ver+Spring,+MD?entry=3Dgmail&source=3Dg">

=C2=A0

--

Gyan Mishra

Network Solutions = Architect=C2=A0

M 301 502-1347
13101 Columbia Pike=C2=A0
Silver Spring, MD

<= a href=3D"https://www.google.com/maps/search/13101+Columbia+Pike+%0D%0A+Sil= ver+Spring,+MD?entry=3Dgmail&source=3Dg">

=C2=A0

--

3D"Image<= /u>

Gyan Mishra

Network Solutions = Architect=C2=A0

M 301 502-1347
13101 Columbia Pike=C2=A0
Silver Spring, MD

=C2=A0

--
--000000000000b4680c05a6332e55-- From nobody Thu May 21 19:32:33 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id C9EC83A0DDE for ; Thu, 21 May 2020 19:32:29 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.086 X-Spam-Level: X-Spam-Status: No, score=-2.086 tagged_above=-999 required=5 tests=[AC_DIV_BONANZA=0.001, BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_REMOTE_IMAGE=0.01, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 5kgr9xh1ZjAC for ; Thu, 21 May 2020 19:32:25 -0700 (PDT) Received: from mail-il1-x12b.google.com (mail-il1-x12b.google.com [IPv6:2607:f8b0:4864:20::12b]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 734053A0DD8 for ; Thu, 21 May 2020 19:32:25 -0700 (PDT) Received: by mail-il1-x12b.google.com with SMTP id a14so9325571ilk.2 for ; Thu, 21 May 2020 19:32:25 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=asAhmoFN7OaFmsNOwKl4QilPnRRKLR92N6jerE0QXNI=; b=i7mEIKlRbZMyXIMBv5idpWhW18WW7RXPwfer6rd9FwvS2FsPFYoRBLPTdQfOEkYot5 E4doPomVp/m/0t6JX4qG+9XehoDMTC6ZhJHR5T97YQ81KSVNk2Hu2u4l7ns4HM+HdvvE 8AXS7FHvh/E8rNrte1sCoGZzlNcjRt9wSz1Limr4sSaBd0QTBwBKj4XF7EDSreJYBsk+ u+JaO0gze60xkVx+P+E9P6QJ7CZIKWhNR/pJANqr/7Vi8JuYlgjvNM44SnqwoxWrH0gC 5AWOeYm2kiB+jdltFGMUskLjc20nOtgZ/+kE3BbEAqA8GH8O6SvUlE2SSbv4MrwdrZ5H uW3g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=asAhmoFN7OaFmsNOwKl4QilPnRRKLR92N6jerE0QXNI=; b=YsAI2UKtoqKzP0Q+T7NJaajBdJjsFMQeNkT8cSOaHToyOq2sFciemH/LtGCNEkcuBH in0YQ7jL7VZfAaQO5PEZ1V5c2Nz/r3FjhYYze5DfSHGsUlwSa+DAbXYHn3lVzKBg7Ghk 0OsLj6jKkoRHvsHC8bOoyYlyPLQav/7JHnkyxVEkG0h1Vw854uPM+qBfpF7YFjT6MW10 8DtSwNq/tgFCvVaX3CmStnYxnbf5zfHHPMmbqxP9vKXPLl03+wGj8/mXbViCtjRGxX9o T7WhjLcfXc2JRCVde+Jh9buu+QWD3kYVSe18BvxG97+aQEm92BslNT2G8Qiwjwow2oHf S4NA== X-Gm-Message-State: AOAM533J/3TQU07q18c7t9YdT1EN2p8G7qaige32o7DSwlu/5tx/S0HT lhVt0b3U3hjiEjgs6hNg+9LfSM3kgdi4ES28Gyk= X-Google-Smtp-Source: ABdhPJxoNojTxxkuJ+oij6b4aDCj57uxWSDcOLKnlXM8K89mHjWdLOtGjNUY7dfYvF3ZZYO7qTs191qpellWPePZxQY= X-Received: by 2002:a92:c948:: with SMTP id i8mr11642592ilq.258.1590114744517; Thu, 21 May 2020 19:32:24 -0700 (PDT) MIME-Version: 1.0 References: <63330FD6-EDE8-4938-AA85-948279C57E34@cisco.com> <424B17B1-D66D-4708-A819-855E972841AF@cisco.com> In-Reply-To: From: Gyan Mishra Date: Thu, 21 May 2020 22:32:13 -0400 Message-ID: To: "Acee Lindem (acee)" Cc: Huaimo Chen , "lsr@ietf.org" Content-Type: multipart/alternative; boundary="0000000000007fca9505a63370d9" Archived-At: Subject: Re: [Lsr] Flooding Topology Computation Algorithm - draft-cc-lsr-flooding-reduction-08 Working Group Adoption Call X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 22 May 2020 02:32:30 -0000 --0000000000007fca9505a63370d9 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable I see the diagrams Appendix A - reviewing Thanks Gyan On Thu, May 21, 2020 at 10:13 PM Gyan Mishra wrote: > > I think for both drafts it would be good to have a stick diagram at a > minimum. > > I majored in EE with math minor and both drafts are hard to follow > without a diagram with labels showing the exact topology examples. > > Four main topologies - full mesh, partial mesh and leaf spine ( 2 tier) > and CLOS ( 3 tier) - real world scenario=E2=80=99s. > > From the interim meeting was their a slide deck visual topology shared? > > That would help. > > https://datatracker.ietf.org/doc/html/draft-cc-lsr-flooding-reduction-08 > > 4.1 > > Step 1 - Build Cq candidate queue > > For each node B on FT whose D is one (from minimum to maximum > node ID), find a link L attached to B such that L's remote node R > has minimum D and ID, add link L between B and R into FT and > increase B's D and R's D by one. Return FT. > > My interpretation is the algorithm an iterative loop and starts with any > node in the candidate list so could start from edge and work left to righ= t > or vice versa. For loop to build FT from Cq =3D with each node B with > directly attached node R via link L. Increment node B from Cq until the = FT > is build for all nodes. Instead of starting with a wide diameter FT > matching physical topology we start micro topology with D=3D1 and go node= by > node. > > 4.2 > > 1. Finding and removing the first element with node A in Cq that is > not on FT and one PH's D in PHs < MaxD and PH's D < PH's ConMaxD. > > If A is root R0, then add the element into FT > > otherwise (i.e., A !=3D R0 with one PH's D in PHs < MaxD and PH's > D < PH's ConMaxD. Assume that PH is the first one in PHs > whose D < MaxD and PH's D < PH's ConMaxD), PH's D++, and add A > with D =3D 1 and PHs =3D {PH} into FT. > > Note: if there is no element with a node in Cq satisfying the > conditions, then algorithm may be restarted from R0, ++MaxD, > Cq =3D {(R0,D=3D0,PHs =3D { })}, FT =3D { }; > > This is similar to 4.1 with micro topology with 2 directly connected node= s > > https://www.ietf.org/id/draft-chen-lsr-dynamic-flooding-algorithm-00.html > > My interpretation of the algorithm from the verbiage. > > So this draft starts in the middle of the topology and is geared towards > leaf spine 2 or 3 tier clos topology. > > For this one we build the bi graph so that could be leaf connected to two > spines or spine connected to two leafs and iteratively build out the FT > topology 3 node arch spine leaf spine or leaf spine leaf. > > Kind regards > > Gyan > > On Thu, May 21, 2020 at 7:01 PM Acee Lindem (acee) wrote= : > >> Hi Gyan, >> >> >> >> *From: *Gyan Mishra >> *Date: *Thursday, May 21, 2020 at 4:20 PM >> *To: *Acee Lindem >> *Cc: *Huaimo Chen , "lsr@ietf.org" < >> lsr@ietf.org> >> *Subject: *Re: [Lsr] Flooding Topology Computation Algorithm - >> draft-cc-lsr-flooding-reduction-08 Working Group Adoption Call >> >> >> >> >> >> Yes and I have started reviewing the LSR mail archives as I am late in >> the discussion for this. >> >> >> >> If you have link to any particular dates in the archives would be helpfu= l. >> >> >> >> No =E2=80=93 it was more an =E2=80=9Cevolution=E2=80=9D than an =E2=80= =9Cepiphany=E2=80=9D. >> >> >> >> That sums up all the questions I have so if all answered in the archives >> then I am all set. >> >> >> >> I support the draft moving forward as flood reduction is a much needed >> feature. >> >> >> >> I think overall both drafts will really help large data centers with any >> overlay underlay vxlan spine leaf meshed CLOS highly meshed topology tha= t >> scales out horizontally with a large spine footprint - this is a much mu= ch >> needed feature. This also helps eliminate complexity of the workaround = of >> using BGP in the underlay which to me adds tremendous complexity. >> >> >> >> Here is the other recently presented dynamic flooding draft. >> >> >> >> >> https://datatracker.ietf.org/doc/draft-chen-lsr-dynamic-flooding-algorit= hm/ >> >> >> >> You can see they both make use of the dynamic flooding infra in >> https://datatracker.ietf.org/doc/draft-ietf-lsr-dynamic-flooding/ >> >> >> >> Thanks, >> >> Acee >> >> >> >> >> >> >> >> >> >> Kind regards >> >> >> >> Gyan >> >> >> >> On Thu, May 21, 2020 at 4:07 PM Acee Lindem (acee) >> wrote: >> >> Speaking as WG Co-chair: >> >> >> >> Hi Gyan, >> >> >> >> I guess you=E2=80=99ve joined this discussion late. It might be a good i= dea to >> review the LSR mailing list archives. >> >> >> >> *From: *Gyan Mishra >> *Date: *Thursday, May 21, 2020 at 1:51 PM >> *To: *Huaimo Chen >> *Cc: *Acee Lindem , "lsr@ietf.org" >> *Subject: *Re: [Lsr] Flooding Topology Computation Algorithm - >> draft-cc-lsr-flooding-reduction-08 Working Group Adoption Call >> >> >> >> >> >> >> >> On Thu, May 21, 2020 at 11:01 AM Huaimo Chen >> wrote: >> >> Hi Gyan, >> >> >> >> Thanks much for your questions. >> >> >> >> Gyan> How does this draft compare to the WG LC draft for flood >> reduction. Would they be two eventual standard options in the operators >> toolbox or competing features for optimized flood reduction. Would havi= ng >> two flood reduction features standardized versus one default IGP flood >> reduction feature be confusing for operators. Just as it was confusing = to >> me. >> >> https://datatracker.ietf.org/doc/draft-ietf-lsr-dynamic-flooding/ >> >> >> >> >> [HC]: This draft plus the draft for flooding reduction can provide >> two modes of flooding reductions (i.e., centralized mode and distributed >> mode). The latter describes the two modes, but does not include any >> flooding topology computation algorithm for the distributed mode. The >> former proposes a flooding topology computation algorithm to be used in >> the distributed mode. >> >> >> >> Gyan> It maybe a good idea for both documents to reference each other >> as to how they play together or in some respects if any provide a >> homogeneous complete holistic solution for flooding problem being solved= . >> >> >> >> It is a good idea to have this new draft reference the dynamic-flooding >> but not vice-versa. The existing dynamic flooding draft provides a >> framework for any dynamic flooding algorithm that provides a separate >> flooding topology. This algorithm is just the first to be formally propo= sed >> in a draft. Note that another algorithm was presented during the LSR >> virtual interim which replaced IETF 107. >> >> >> >> In my opinion it may not be a bad idea even to combine both drafts so th= e >> solution is complete and holistic. This will also make the overall >> specification flow nicely. >> >> >> >> No =E2=80=93 we=E2=80=99re not going to do this. >> >> >> >> Thanks, >> >> Acee >> >> >> >> I know that efforts were made by LSR to have a common IGP solution, >> however there are many inherent differences between ISIS and OSPF that f= rom >> IGP Link state protocol perspective you can treat like apples to apples = but >> really it=E2=80=99s apples and oranges. Maybe it might we wise to have = separate >> draft for both and have references linking together as the same algorith= m >> concept and mathematically however the actual code implementation would >> vary as the LSDB link state data structures are completely different. >> >> >> >> Later =3D Dynamic flooding =3D 2 modes Centralized leader based and >> distributed >> >> >> >> https://datatracker.ietf.org/doc/draft-ietf-lsr-dynamic-flooding/ >> >> >> >> This later draft per section excerpt provides both centralized and >> distributed algorithm see below >> >> >> >> *6.4 . Area Leader Responsibilities* >> >> >> >> If the Area Leader operates in centralized mode, it MUST advertise >> >> algorithm 0 in its Area Leader Sub-TLV. In order for Dynamic >> >> Flooding to be enabled it also MUST compute and advertise a flooding >> >> topology for the area. The Area Leader may update the flooding >> >> topology at any time, however, it should not destabilize the network >> >> with undue or overly frequent topology changes. If the Area Leader >> >> operates in centralized mode and needs to advertise a new flooding >> >> topology, it floods the new flooding topology on both the new and old >> >> flooding topologies. >> >> >> >> If the Area Leader operates in distributed mode, it MUST advertise a >> >> non-zero algorithm in its Area Leader Sub-TLV. >> >> >> >> When the Area Leader advertises algorithm 0 in its Area Leader Sub- >> >> TLV and does not advertise a flooding topology, Dynamic Flooding is >> >> disabled for the area. Note this applies whether the Area Leader >> >> intends to operate in centralized mode or in distributed mode. >> >> >> >> Note that once Dynamic Flooding is enabled, disabling it risks >> >> destabilizing the network. >> >> >> >> *6.5 . Distributed Flooding Topology Calculation* >> >> >> >> If the Area Leader advertises a non-zero algorithm in its Area Leader >> >> Sub-TLV, all nodes in the area that support Dynamic Flooding and the >> >> value of algorithm advertised by the Area Leader MUST compute the >> >> flooding topology based on the Area Leader's advertised algorithm. >> >> >> >> Nodes that do not support the value of algorithm advertised by the >> >> Area Leader MUST continue to use standard flooding mechanism as >> >> defined by the protocol. >> >> >> >> Nodes that do not support the value of algorithm advertised by the >> >> Area Leader MUST be considered as Dynamic Flooding incapable nodes by >> >> the Area Leader. >> >> >> >> If the value of the algorithm advertised by the Area Leader is from >> >> the range 128-254 (private distributed algorithms), it is the respons= ibility of the >> >> network operator to guarantee that all nodes in the area have a common u= nderstanding of what the given algorithm value represents. >> >> >> >> Former =3D WG LC >> >> https://datatracker.ietf.org/doc/html/draft-cc-lsr-flooding-reduction-08 >> >> >> >> Provides algorithm for distributed mode for this draft as well as the >> algorithm to be used for distributed mode later dynamic flooding draft >> >> >> >> Separate question- >> >> >> >> In light of the flooding algorithm and seeing that at the bottom of >> section 6.5 mentions flooding algorithm are the IANA codepoints reserved >> for flooding unique and non overlapping with the flex algo codepoints I >> believe 0-127. I would think the flooding algorithm range of values is >> completely separate since a different function then flex algo values. >> >> >> >> https://datatracker.ietf.org/doc/html/draft-ietf-lsr-flex-algo-07 >> >> >> >> >> >> Best Regards, >> >> Huaimo >> ------------------------------ >> >> *From:* Gyan Mishra >> *Sent:* Thursday, May 21, 2020 10:36 AM >> >> >> *To:* Huaimo Chen >> *Cc:* Acee Lindem (acee) ; lsr@ietf.o= rg >> >> *Subject:* Re: [Lsr] Flooding Topology Computation Algorithm - >> draft-cc-lsr-flooding-reduction-08 Working Group Adoption Call >> >> >> >> >> >> >> >> On Wed, May 20, 2020 at 11:59 PM Huaimo Chen >> wrote: >> >> Hi Gyan, >> >> >> >> Thanks much for your questions. My answers are inline below with [HC= ]. >> >> >> >> Best Regards, >> >> Huaimo >> ------------------------------ >> >> *From:* Gyan Mishra >> *Sent:* Wednesday, May 20, 2020 11:14 AM >> *To:* Huaimo Chen >> *Cc:* Acee Lindem (acee) ; lsr@ietf.o= rg >> >> *Subject:* Re: [Lsr] Flooding Topology Computation Algorithm - >> draft-cc-lsr-flooding-reduction-08 Working Group Adoption Call >> >> >> >> Huaimo >> >> >> >> This is a much needed feature that operators have been needing for >> densely meshed topologies that commonly exist in data centers to >> accommodate very high bandwidth E-W traffic. >> >> [HC]: Thank you very much. >> >> >> >> Below is link from Cisco which has introduced feature for dynamic >> flooding in clos high density ECMP data center topologies. >> >> >> >> Please look at the feature description and it does seem to be exactly th= e >> same as this draft. Please confirm. >> >> [HC]: It seems different. >> >> >> >> There maybe other vendors due to industry demand have to get the feature >> deployed before it reaches standards vendor consensus with the IETF. >> >> >> >> >> https://www.cisco.com/c/en/us/products/collateral/switches/nexus-9000-se= ries-switches/white-paper-c11-743015.html >> >> >> >> >> We are testing this feature and planning to deploy but wanted to ensure >> that this is the same as the draft on the standards track. >> >> [HC]: The feature appears implemented draft "Dynamic Flooding on Dense >> Graphs", which does not include any flooding topology computation >> algorithm.. >> >> >> >> Gyan> How does this draft compare to the WG LC draft for flood >> reduction. Would they be two eventual standard options in the operators >> toolbox or competing features for optimized flood reduction. Would havi= ng >> two flood reduction features standardized versus one default IGP flood >> reduction feature be confusing for operators. Just as it was confusing = to >> me. >> >> >> >> >> >> https://datatracker.ietf.org/doc/draft-ietf-lsr-dynamic-flooding/ >> >> >> >> >> Kind regards >> >> >> >> Gyan >> >> >> >> >> >> On Tue, May 19, 2020 at 11:52 PM Huaimo Chen >> wrote: >> >> Hi Gyan, >> >> >> >> Thank you very much for your questions and support. >> >> >> >> This Flooding Topology Computation algorithm can be used in the >> Dynamic Flooding on Dense Graphs to compute the flooding topologies for >> the data center clos dense meshed topologies with many ECMP paths. It ca= n >> be used by the area leader in the centralized mode to compute the floodi= ng >> topology. >> >> >> >> Best Regards, >> >> Huaimo >> ------------------------------ >> >> *From:* Lsr on behalf of Gyan Mishra < >> hayabusagsm@gmail.com> >> *Sent:* Tuesday, May 19, 2020 2:39 AM >> *To:* Yanhe Fan >> *Cc:* lsr@ietf.org ; Acee Lindem (acee) > 40cisco.com@dmarc.ietf.org> >> *Subject:* Re: [Lsr] Flooding Topology Computation Algorithm - >> draft-cc-lsr-flooding-reduction-08 Working Group Adoption Call >> >> >> >> >> >> I support WG adoption and have a few questions related to the draft. >> >> >> >> Does this flooding algorithm use the dynamic flooding algorithm used in >> data center clos dense meshed topologies with many ECMP paths where the >> flood is decoupled from the physical topology. In the dynamic flooding >> algorithm mentioned in centralized mode the flooding is computed by the >> area leader and distributed to all nodes. In distributed mode each mode >> the area leader determines the algorithm and then each node computes the >> flooding topology based on the algorithm. >> >> >> >> This dynamic algorithm for optimized flood reduction would reduce the >> amount of redundant flooding in highly densely meshed ospf or Isis >> topologies. So this optimization of flooding would improving overall li= nk >> state routing protocol convergence. >> >> >> >> Gyan >> >> >> >> On Mon, May 18, 2020 at 3:37 PM Yanhe Fan wrote: >> >> Support it as a co-author. >> >> >> >> Thanks, >> >> Yanhe >> >> >> >> *From:* Lsr *On Behalf Of *Acee Lindem (acee) >> *Sent:* Friday, May 15, 2020 3:40 PM >> *To:* lsr@ietf.org >> *Subject:* [Lsr] Flooding Topology Computation Algorithm - >> draft-cc-lsr-flooding-reduction-08 Working Group Adoption Call >> >> >> >> This begins a 3 week (due to holidays) WG adoption call for the =E2=80= =9CFlooding >> Topology Computation Algorithm=E2=80=9D draft. Please issue your support= or >> objection to this list by 11:59 PM, UTC on June 5th, 2020. Here is a URL >> for your convenience. >> >> >> >> https://datatracker.ietf.org/doc/draft-cc-lsr-flooding-reduction/ >> >> >> >> >> Thanks, >> Acee >> >> _______________________________________________ >> Lsr mailing list >> Lsr@ietf.org >> https://www.ietf.org/mailman/listinfo/lsr >> >> >> -- >> >> *Error! Filename not specified.* >> >> >> *Gyan >> Mishra* >> >> >> *Network >> Solutions Architect * >> >> >> >> *M 301 502-1347 13101 Columbia Pike >> >> *Silver Spring, MD >> >> >> >> >> -- >> >> *Error! Filename not specified.* >> >> >> *Gyan Mishra* >> >> *Network Solutions Architect * >> >> >> >> *M 301 502-1347 >> 13101 >> Columbia Pike >> >> *Silver Spring, MD >> >> >> >> >> -- >> >> *Error! Filename not specified.* >> >> >> *Gyan Mishra* >> >> *Network Solutions Architect * >> >> >> >> *M 301 502-1347 13101 Columbia Pike >> >> *Silver Spring, MD >> >> >> >> >> >> >> -- >> >> *Error! Filename not specified.* >> >> *Gyan Mishra* >> >> *Network Solutions Architect * >> >> >> >> *M 301 502-1347 13101 Columbia Pike >> >> *Silver Spring, MD >> >> >> >> >> >> >> -- >> >> [image: Image removed by sender.] >> >> *Gyan Mishra* >> >> *Network Solutions Architect * >> >> >> >> *M 301 502-1347 13101 Columbia Pike >> >> *Silver Spring, MD >> >> >> >> >> >> > -- > > > > *Gyan Mishra* > > *Network Solutions A**rchitect * > > > > *M 301 502-134713101 Columbia Pike *Silver Spring, MD > > -- *Gyan Mishra* *Network Solutions A**rchitect * *M 301 502-134713101 Columbia Pike *Silver Spring, MD --0000000000007fca9505a63370d9 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable

I see the diagrams Appendix A - =C2=A0revi= ewing=C2=A0

Thanks=C2=A0=

Gyan

On Thu, May 21= , 2020 at 10:13 PM Gyan Mishra <hayabusagsm@gmail.com> wrote:

I think for both drafts it would be goo= d to have a stick diagram at a minimum. =C2=A0

<= /div>
I majored in EE with math =C2=A0minor and both draft= s are hard to follow without a diagram with labels showing the exact topolo= gy examples. =C2=A0

Four= main topologies - full mesh, partial mesh and leaf spine ( 2 tier) and CLO= S ( 3 tier) - real world scenario=E2=80=99s.

From the interim meeting was their a slide deck visual= topology shared?=C2=A0

= That would help.

https://datatracker.ietf.org/doc/html/draft-cc-ls= r-flooding-reduction-08

4.1=C2=A0

Step 1 - Build Cq candidate = queue=C2=A0

For ea=
ch node B on FT whose D is one (from minimum to maximum
       node ID), find a link L attached to B such that L's remote node =
R
       has minimum D and ID, add link L between B and R into FT and
       increase B's D and R's D by one.  Return FT.
My interpretation is the algorithm an iterative loop and star= ts with any node in the candidate list so could start from edge and work le= ft to right or vice versa.=C2=A0 For loop to build FT from Cq =3D with each= node B with directly attached node R via link L.=C2=A0 Increment node B fr= om Cq until the FT is build for all nodes.=C2=A0 Instead of starting with a= wide diameter FT matching physical topology we start micro topology with D= =3D1 and go node by node.

4.2=C2=A0

1.  Fi=
nding and removing the first element with node A in Cq that is
       not on FT and one PH's D in PHs < MaxD and PH's D < PH=
's ConMaxD.

       If A is root R0, then add the element into FT

       otherwise  (i.e., A !=3D R0 with one PH's D in PHs < MaxD and=
 PH's
          D < PH's ConMaxD.  Assume that PH is the first one in PHs
          whose D < MaxD and PH's D < PH's ConMaxD), PH's=
 D++, and add A
          with D =3D 1 and PHs =3D {PH} into FT.

       Note:  if there is no element with a node in Cq satisfying the
          conditions, then algorithm may be restarted from R0, ++MaxD,
          Cq =3D {(R0,D=3D0,PHs =3D { })}, FT =3D { };
This is similar to 4.1 with micro topology with 2 directly connec= ted nodes=C2=A0

My interpreta= tion of the algorithm from the verbiage.

<= div dir=3D"auto">So this draft starts in the middle of the topology and is = geared towards leaf spine 2 or 3 tier clos topology.

For this one we build the bi graph so that cou= ld be leaf connected to two spines or spine connected to two leafs and iter= atively build out the FT topology 3 node arch =C2=A0spine leaf spine or lea= f spine leaf.

Kind regar= ds=C2=A0

Gyan
=
On Thu= , May 21, 2020 at 7:01 PM Acee Lindem (acee) <acee@cisco.com> wrote:

Hi Gyan,

=C2=A0

From: Gyan Mishra <hayabusagsm@gmail.com= >
Date: Thursday, May 21, 2020 at 4:20 PM
To: Acee Lindem <acee@cisco.com>
Cc: Huaimo Chen <huaimo.chen@futurewei.com>, "lsr@ietf.org" <lsr@ietf.org>
Subject: Re: [Lsr] Flooding Topology Computation Algorithm - draft-c= c-lsr-flooding-reduction-08 Working Group Adoption Call

=C2=A0

=C2=A0

Yes and I have started r= eviewing the LSR mail archives as I am late in the discussion for this.<= /u>

=C2=A0

If you have link to any = particular dates in the archives would be helpful.

=C2=A0

No =E2=80=93 it was more an =E2=80=9Cevolution=E2=80= =9D than an =E2=80=9Cepiphany=E2=80=9D.

=C2=A0

That sums up all the que= stions I have so if all answered in the archives then I am all set.<= u>

=C2=A0

I support the draft movi= ng forward as flood reduction is a much needed feature. =C2=A0

=C2=A0

I think overall both dra= fts will really help large data centers with any overlay underlay vxlan spi= ne leaf meshed CLOS highly meshed topology that scales out horizontally wit= h a large spine footprint - this is a much much needed feature.=C2=A0 This also helps eliminate complexity of th= e workaround of using BGP in the underlay which to me adds tremendous compl= exity.

=C2=A0

Here is the other recently presented dynamic floodin= g draft.

=C2=A0

https://datatracker.i= etf.org/doc/draft-chen-lsr-dynamic-flooding-algorithm/

=C2=A0

You can see they both make use of the dynamic floodi= ng infra in https://datatracker.ietf.org/doc/draft-ietf-lsr-dynami= c-flooding/

=C2=A0

Thanks,

Acee

=C2=A0

=C2=A0

=C2=A0

=C2=A0

Kind regards=C2=A0

=C2=A0

Gyan=C2=A0=

=C2=A0

On Thu, May 21, 2020 at = 4:07 PM Acee Lindem (acee) <acee@cisco.com> wrote:

=
<= div lang=3D"EN-US" link=3D"blue" vlink=3D"purple">

Speaking as WG Co-chair:

=C2=A0

Hi Gyan,

=C2=A0

I guess you=E2=80=99ve joined this discussion late. It might be a good idea= to review the LSR mailing list archives.

=C2=A0

From: Gyan Mishra <hayabusagsm@gmail.com>
Date: Thursday, May 21, 2020 at 1:51 PM
To: Huaimo Chen <huaimo.chen@futurewei.com>
Cc: Acee Lindem <acee@cisco.com>, "lsr@ietf.org" <lsr@ietf.org>
Subject: Re: [Lsr] Flooding Topology Computation Algorithm - draft-c= c-lsr-flooding-reduction-08 Working Group Adoption Call

=C2=A0

=C2=A0

=C2=A0

On Thu, May 21, 2020 at 11:01 AM Huaimo Chen <huaimo.chen@futurewei.com> wrot= e:

Hi Gyan,

=C2=A0

=C2=A0 =C2=A0 Thanks much for yo= ur questions.

=C2=A0

=C2=A0Gyan> How does this dra= ft compare to the WG LC draft for flood reduction.=C2=A0 Would they be two = eventual standard options in the operators toolbox =C2=A0or competing featu= res for optimized flood reduction. Would having two flood reduction features standardized versus one default IGP flood reducti= on feature be confusing for operators.=C2=A0 Just as it was confusing to me= .=C2=A0

=C2=A0

=C2=A0 =C2=A0 [HC]: This draft p= lus the draft for flooding reduction can provide two modes of flooding redu= ctions (i.e., centralized mode and distributed mode). The latter describes = the two modes, but does not include any flooding topology computation algorithm for the distributed mode. The former propos= es a=C2=A0flooding topology computat= ion algorithm to be used in the distributed mode.=C2=A0=C2=A0=

=C2=A0

=C2=A0 =C2=A0Gyan> It maybe a good idea for both documents to reference = each other as to how they play together or =C2=A0in some respects if any pr= ovide a homogeneous complete holistic solution for flooding problem being s= olved. =C2=A0

=C2=A0

It is a good idea to have this new draft reference the dynamic-flooding but= not vice-versa. The existing dynamic flooding draft provides a framework f= or any dynamic flooding algorithm that provides a separate flooding topolog= y. This algorithm is just the first to be formally proposed in a draft. Note that another algorithm was presen= ted during the LSR virtual interim which replaced IETF 107. =C2=A0

=C2=A0

In my opinion it may not be a bad idea even to combine both drafts so the s= olution is complete and holistic.=C2=A0 This will also make the overall spe= cification flow nicely. =C2=A0

=C2=A0

No =E2=80=93 we=E2=80=99re not going to do this.

=C2=A0

Thanks,

Acee

=C2=A0

I know that efforts were made by LSR to have a common IGP solution, however= there are many inherent differences between ISIS and OSPF that from IGP Li= nk state protocol perspective you can treat like apples to apples but reall= y it=E2=80=99s apples and oranges.=C2=A0 Maybe it might we wise to have separate draft for both and have references linki= ng together as the same algorithm concept and mathematically however the ac= tual code implementation would vary as the LSDB link state data structures = are completely different.=C2=A0

=C2=A0

Later =3D Dynamic flooding =3D 2 modes Centralized leader based and distrib= uted=C2=A0

=C2=A0

This later draft per section excerpt provides both centralized and distribu= ted algorithm see below=C2=A0

=C2=A0

6.4.=C2=A0 Area Leader Responsibilities
=C2=A0
=C2=A0=C2=A0 If the Area Leader operates in central=
ized mode, it MUST advertise<=
u style=3D"font-family:monospace">
=C2=A0=C2=A0 algorithm 0 in its Area Leader Sub-TLV=
.=C2=A0 In order for Dynamic<=
u style=3D"font-family:monospace">
=C2=A0=C2=A0 Flooding to be enabled it also MUST co=
mpute and advertise a flooding
=C2=A0=C2=A0 topology for the area.=C2=A0 The Area =
Leader may update the flooding
=C2=A0=C2=A0 topology at any time, however, it shou=
ld not destabilize the network
=C2=A0=C2=A0 with undue or overly frequent topology=
 changes.=C2=A0 If the Area Leader
=C2=A0=C2=A0 operates in centralized mode and needs=
 to advertise a new flooding<=
u style=3D"font-family:monospace">
=C2=A0=C2=A0 topology, it floods the new flooding t=
opology on both the new and old
=C2=A0=C2=A0 flooding topologies.
=C2=A0
=C2=A0=C2=A0 If the Area Leader operates in distrib=
uted mode, it MUST advertise a
=C2=A0=C2=A0 non-zero algorithm in its Area Leader =
Sub-TLV.
=C2=A0
=C2=A0=C2=A0 When the Area Leader advertises algori=
thm 0 in its Area Leader Sub-=

=C2=A0=C2=A0 TLV and does not advertise a flooding =
topology, Dynamic Flooding is=

=C2=A0=C2=A0 disabled for the area.=C2=A0 Note this=
 applies whether the Area Leader<=
/u>
=C2=A0=C2=A0 intends to operate in centralized mode=
 or in distributed mode.
=C2=A0
=C2=A0=C2=A0 Note that once Dynamic Flooding is ena=
bled, disabling it risks
=C2=A0=C2=A0 destabilizing the network.

=C2=A0


6.5.=C2=A0 Distributed Flooding Topology Calculation<=
u style=3D"font-family:monospace">


=C2=A0


=C2=A0=C2=A0 If the Area Leader advertises a non-ze=
ro algorithm in its Area Leader


=C2=A0=C2=A0 Sub-TLV, all nodes in the area that su=
pport Dynamic Flooding and the


=C2=A0=C2=A0 value of algorithm advertised by the A=
rea Leader MUST compute the


=C2=A0=C2=A0 flooding topology based on the Area Le=
ader's advertised algorithm.<=
/u>


=C2=A0


=C2=A0=C2=A0 Nodes that do not support the value of=
 algorithm advertised by the<=
u style=3D"font-family:monospace">


=C2=A0=C2=A0 Area Leader MUST continue to use stand=
ard flooding mechanism as


=C2=A0=C2=A0 defined by the protocol.

=C2=A0


=C2=A0=C2=A0 Nodes that do not support the value of=
 algorithm advertised by the<=
u style=3D"font-family:monospace">


=C2=A0=C2=A0 Area Leader MUST be considered as Dyna=
mic Flooding incapable nodes by


=C2=A0=C2=A0 the Area Leader.


=C2=A0


=C2=A0=C2=A0 If the value of the algorithm advertis=
ed by the Area Leader is from=



=C2=A0=C2=A0 the range 128-254 (private distributed=
 algorithms), it is the responsibility of the=C2=A0


network operator to guarante=
e that all nodes in the area have a common understanding of what the given =
algorithm value represents.


=C2=A0

Former =3D WG LC=C2=A0

Provides algorithm for distributed mode for this draft as well as the algor= ithm to be used for distributed mode later dynamic flooding draft=C2=A0<= /u>

=C2=A0

Separate question-

=C2=A0

In light of the flooding algorithm and seeing that at the bottom of section= 6.5 mentions flooding algorithm are the IANA codepoints reserved for flood= ing unique and non overlapping with the flex algo codepoints I believe 0-12= 7.=C2=A0 I would think the flooding algorithm range of values is completely separate since a different function then fle= x algo values.

=C2=A0

=C2=A0

Best Regards,

Huaimo

From:= Gyan Mishra <hayabusagsm@gmail.com>
Sent: Thursday, May 21, 2020 10:36 AM


To: Huaimo Chen <huaimo.chen@futurewei.com>
Cc: Acee Lindem (acee) <acee=3D40cisco.com@dmarc.ietf.org>; lsr@ietf.org <lsr@ietf.org>
Subject: Re: [Lsr] Flooding Topology Computation Algorithm - draft-c= c-lsr-flooding-reduction-08 Working Group Adoption Call

=C2=A0

=C2=A0

=C2=A0

On Wed, May 20, 2020 at 11:59 PM Huaimo Chen <huaimo.chen@futurewei.com> wrot= e:

Hi Gyan,

=C2=A0

=C2=A0 =C2=A0 Thanks much for yo= ur questions. My answers are inline below with [HC].

=C2=A0

Best Regards,

Huaimo

From:= Gyan Mishra <hayabusagsm@gmail.com>
Sent: Wednesday, May 20, 2020 11:14 AM
To: Huaimo Chen <huaimo.chen@futurewei.com>
Cc: Acee Lindem (acee) <acee=3D40cisco.com@dmarc.ietf.org>; lsr@ietf.org <lsr@ietf.org>
Subject: Re: [Lsr] Flooding Topology Computation Algorithm - draft-c= c-lsr-flooding-reduction-08 Working Group Adoption Call

=C2=A0

Huaimo=C2=A0

=C2=A0

This is a much needed feature that operators have been needing for densely = meshed topologies that commonly exist in data centers to accommodate very h= igh bandwidth E-W traffic.

[HC]: Thank you very much.

=C2=A0

Below is link from Cisco which has introduced feature for dynamic flooding = in clos high density ECMP data center topologies.

=C2=A0

Please look at the feature description and it does seem to be exactly the s= ame as this draft.=C2=A0 Please confirm.=C2=A0

[HC]: It seems different.=C2=A0

=C2=A0

There maybe other vendors due to industry demand have to get the feature de= ployed before it reaches standards vendor consensus with the IETF.

=C2=A0

=C2=A0

We are testing this feature and planning to deploy but wanted to ensure tha= t this is the same as the draft on the standards track.

[HC]: The feature appear= s implemented draft "Dynamic Flooding on Dense Graphs", which doe= s not include any flooding topology computation algorithm..=C2=A0=

=C2=A0

=C2=A0 =C2=A0 Gyan> How does this draft compare to the WG LC draft for f= lood reduction.=C2=A0 Would they be two eventual standard options in the op= erators toolbox =C2=A0or competing features for optimized flood reduction. = Would having two flood reduction features standardized versus one default IGP flood reduction feature be confusing for operators.= =C2=A0 Just as it was confusing to me.

=C2=A0

=C2=A0

Kind regards=C2=A0

=C2=A0

Gyan

=C2=A0

=C2=A0

On Tue, May 19, 2020 at 11:52 PM Huaimo Chen <huaimo.chen@futurewei.com> wrot= e:

Hi = Gyan,

=C2=A0

=C2= =A0 =C2=A0 Thank you very much for your questions and support.

=C2=A0

=C2= =A0 =C2=A0 This Flooding Topology Comput= ation algorithm can be used in the Dynamic Flooding on Dense Graphs to compute the flooding topologies for the=C2=A0data cente= r clos dense meshed topologies with many ECMP paths. It can be used by the = area leader in the centralized mode to compute the flooding topology. =C2= =A0=C2=A0

=C2=A0

Bes= t Regards,

Hua= imo

From:= Lsr <lsr-boun= ces@ietf.org> on behalf of Gyan Mishra <hayabusagsm@gmail.com>
Sent: Tuesday, May 19, 2020 2:39 AM
To: Yanhe Fan <yfan@casa-systems.com>
Cc: lsr@ietf.org <lsr@ietf.org&g= t;; Acee Lindem (acee) <acee=3D40cisco.com@dmarc.ietf.org>
Subject: Re: [Lsr] Flooding Topology Computation Algorithm - draft-c= c-lsr-flooding-reduction-08 Working Group Adoption Call

=C2=A0

=C2=A0

I support WG adoption and have a few questions related to the draft.=

=C2=A0

Does this flooding algorithm use the dynamic flooding algorithm used in dat= a center clos dense meshed topologies with many ECMP paths where the flood = is decoupled from the physical topology.=C2=A0 In the dynamic flooding algo= rithm mentioned in centralized mode the flooding is computed by the area leader and distributed to all nodes.=C2= =A0 In distributed mode each mode the area leader determines the algorithm = and then each node computes the flooding topology based on the algorithm. = =C2=A0

=C2=A0

This dynamic algorithm for optimized flood reduction would reduce the amoun= t of redundant flooding in highly densely meshed ospf or Isis topologies.= =C2=A0 So this optimization of flooding would improving overall link state = routing protocol convergence.

=C2=A0

Gyan=C2=A0

=C2=A0

On Mon, May 18, 2020 at 3:37 PM Yanhe Fan <yfan@casa-systems.com> wrote:

Support it as a co-author.

=C2=A0

Thanks,

Yanhe

_______________________________________________
Lsr mailing list
Lsr@ietf.org
https://www= .ietf.org/mailman/listinfo/lsr

--

Error! Filename not specified.

Gyan Mishra

Network Soluti= ons Architect=C2=A0

M 301 502-1347
13101 Columbia Pike=C2=A0
Silver Spring, MD

=C2=A0

--

Error! Filename not specified.

Gyan Mishra

Network Solutions = Architect=C2=A0

M 301 502-1347
= 13101 Columbia Pike=C2=A0
Silver Spring, MD

=C2=A0

--

<= /div>
=

Gyan Mishra

Network Solutions = Architect=C2=A0

M 301 502-1347
13101 Columbia Pike=C2=A0
Silver Spring, MD

<= a href=3D"https://www.google.com/maps/search/13101+Columbia+Pike+%0D%0A+Sil= ver+Spring,+MD?entry=3Dgmail&source=3Dg" target=3D"_blank">

=C2=A0

--

Gyan Mishra

Network Solutions = Architect=C2=A0

M 301 502-1347
13101 Columbia Pike=C2=A0
Silver Spring, MD

<= a href=3D"https://www.google.com/maps/search/13101+Columbia+Pike+%0D%0A+Sil= ver+Spring,+MD?entry=3Dgmail&source=3Dg" target=3D"_blank">

=C2=A0

--

3D"Image

Gyan Mishra

Network Solutions = Architect=C2=A0

M 301 502-1347
13101 Columbia Pike=C2=A0
Silver Spring, MD

<= a href=3D"https://www.google.com/maps/search/13101+Columbia+Pike+%0D%0A+Sil= ver+Spring,+MD?entry=3Dgmail&source=3Dg" target=3D"_blank">

=C2=A0

--


Gyan Mishra

Network Solutions Architect=C2=A0

M 301 502-1347
13101 Columbia Pike=C2=A0
<= /i>Silver Spring, MD


=
--
--0000000000007fca9505a63370d9-- From nobody Thu May 21 19:59:58 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 160C63A0E06 for ; Thu, 21 May 2020 19:59:56 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.088 X-Spam-Level: X-Spam-Status: No, score=-2.088 tagged_above=-999 required=5 tests=[AC_DIV_BONANZA=0.001, BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_REMOTE_IMAGE=0.01, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=arista.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id nuQysx1Z6v1R for ; Thu, 21 May 2020 19:59:51 -0700 (PDT) Received: from mail-wr1-x430.google.com (mail-wr1-x430.google.com [IPv6:2a00:1450:4864:20::430]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 3C5F33A0DFB for ; Thu, 21 May 2020 19:59:50 -0700 (PDT) Received: by mail-wr1-x430.google.com with SMTP id w7so8651379wre.13 for ; Thu, 21 May 2020 19:59:50 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=arista.com; s=googlenew; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=e8JB7MQNyVrhxRjJN2/GIMAk6Cg4wu2bPcKDcGgoibE=; b=WE1k63hEhc+wj/eCIMu97zTQHyTqka/ylTfWlnq99+ksu/4QG4i3FBh/YahXjAQql+ Wi5V49VnFrpCmHunTsvbm3BomurkGCYcor83cb1QcBrZ9U0yZroWSyYi8OLrtauoUcb7 eVzUnTP6xo9Bmo1wddR5dgJImQOE5JWWeR6RdwzBadgMmq26P9qOpXLPPLmcqiHKYIsP +wwOj6lB0cKGOBve1dLrlS0hPSHRGrSWwb26ZtQDhP4zduvn4n+ivcATTnJeTs/Z1kK0 /CUBAGEQZ8KecfyJODV/XSaADr4YrYn4TklDnatcy4CdM1tkz6E9BqnRF3Fpfh9BnJf5 W/AA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=e8JB7MQNyVrhxRjJN2/GIMAk6Cg4wu2bPcKDcGgoibE=; b=SN9+CZyrYPZJp3TYIGwn/s/afsp46rL1TgRP5YL/B8zyWPfE5RxD9kjlHotiQkZqKN lR3076my1ABIGe44d7OgUObVgqCEeM2AKWjL95ND1jeMfh1zWWoZfAxT7iB9KmhJqYRv Nzg/0Z5EBfFNk9yTdTshAL67Ghf9ccpg5clVEkNm7RTt21m0syxq+1xaJkObwzu89WZ9 9iSCMbB3n5uh9mSAj79YzaHKmMQA2UhqiiGrENJ41Jk/zBgI5MQ95nT9uvreb9HMQhqh MUcMrxFFFw3ZjuNGLuRbRUdTIOij5pbzjeQw6BsegtofMzyBFiwXCUVdTLYS08mTG7cv b1VA== X-Gm-Message-State: AOAM531F4eBdpSGaC3SiZIsJ7Zf0/UR3QKs2+aAvcNkNZzaj0o9NjvKt l+JwqvxGbJ6lyDkYUpHFu9qF0iOCXEhjopXOWfRyaOiSczY= X-Google-Smtp-Source: ABdhPJzeqPAtq2mLNhdBax8medNYNwJFUEIXxCX56t8HenKNvSizBnQmSbHmN0S7wB+Ch3MbRTgqms56TrGfb9Gx0D4= X-Received: by 2002:adf:f48b:: with SMTP id l11mr1331911wro.312.1590116389099; Thu, 21 May 2020 19:59:49 -0700 (PDT) MIME-Version: 1.0 References: <63330FD6-EDE8-4938-AA85-948279C57E34@cisco.com> <424B17B1-D66D-4708-A819-855E972841AF@cisco.com> In-Reply-To: From: Sarah Chen Date: Thu, 21 May 2020 19:59:37 -0700 Message-ID: To: Gyan Mishra Cc: "Acee Lindem (acee)" , "lsr@ietf.org" , Huaimo Chen Content-Type: multipart/alternative; boundary="000000000000863e2305a633d200" Archived-At: Subject: Re: [Lsr] Flooding Topology Computation Algorithm - draft-cc-lsr-flooding-reduction-08 Working Group Adoption Call X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 22 May 2020 02:59:56 -0000 --000000000000863e2305a633d200 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hi, Gyan, I presented https://www.ietf.org/id/draft-chen-lsr-dynamic-flooding-algorithm-00.html i= n the last IETF. You may find the slides below helpful in understanding the algorithm: https://datatracker.ietf.org/meeting/interim-2020-lsr-01/materials/slides-i= nterim-2020-lsr-01-sessa-2-dynamic-flooding-algo-sarah.pdf Thanks, Sarah On Thu, May 21, 2020 at 7:32 PM Gyan Mishra wrote: > > I see the diagrams Appendix A - reviewing > > Thanks > > Gyan > > On Thu, May 21, 2020 at 10:13 PM Gyan Mishra > wrote: > >> >> I think for both drafts it would be good to have a stick diagram at a >> minimum. >> >> I majored in EE with math minor and both drafts are hard to follow >> without a diagram with labels showing the exact topology examples. >> >> Four main topologies - full mesh, partial mesh and leaf spine ( 2 tier) >> and CLOS ( 3 tier) - real world scenario=E2=80=99s. >> >> From the interim meeting was their a slide deck visual topology shared? >> >> That would help. >> >> https://datatracker.ietf.org/doc/html/draft-cc-lsr-flooding-reduction-08 >> >> 4.1 >> >> Step 1 - Build Cq candidate queue >> >> For each node B on FT whose D is one (from minimum to maximum >> node ID), find a link L attached to B such that L's remote node R >> has minimum D and ID, add link L between B and R into FT and >> increase B's D and R's D by one. Return FT. >> >> My interpretation is the algorithm an iterative loop and starts with any >> node in the candidate list so could start from edge and work left to rig= ht >> or vice versa. For loop to build FT from Cq =3D with each node B with >> directly attached node R via link L. Increment node B from Cq until the= FT >> is build for all nodes. Instead of starting with a wide diameter FT >> matching physical topology we start micro topology with D=3D1 and go nod= e by >> node. >> >> 4.2 >> >> 1. Finding and removing the first element with node A in Cq that is >> not on FT and one PH's D in PHs < MaxD and PH's D < PH's ConMaxD. >> >> If A is root R0, then add the element into FT >> >> otherwise (i.e., A !=3D R0 with one PH's D in PHs < MaxD and PH'= s >> D < PH's ConMaxD. Assume that PH is the first one in PHs >> whose D < MaxD and PH's D < PH's ConMaxD), PH's D++, and add A >> with D =3D 1 and PHs =3D {PH} into FT. >> >> Note: if there is no element with a node in Cq satisfying the >> conditions, then algorithm may be restarted from R0, ++MaxD, >> Cq =3D {(R0,D=3D0,PHs =3D { })}, FT =3D { }; >> >> This is similar to 4.1 with micro topology with 2 directly connected >> nodes >> >> https://www.ietf.org/id/draft-chen-lsr-dynamic-flooding-algorithm-00.htm= l >> >> My interpretation of the algorithm from the verbiage. >> >> So this draft starts in the middle of the topology and is geared towards >> leaf spine 2 or 3 tier clos topology. >> >> For this one we build the bi graph so that could be leaf connected to tw= o >> spines or spine connected to two leafs and iteratively build out the FT >> topology 3 node arch spine leaf spine or leaf spine leaf. >> >> Kind regards >> >> Gyan >> >> On Thu, May 21, 2020 at 7:01 PM Acee Lindem (acee) >> wrote: >> >>> Hi Gyan, >>> >>> >>> >>> *From: *Gyan Mishra >>> *Date: *Thursday, May 21, 2020 at 4:20 PM >>> *To: *Acee Lindem >>> *Cc: *Huaimo Chen , "lsr@ietf.org" < >>> lsr@ietf.org> >>> *Subject: *Re: [Lsr] Flooding Topology Computation Algorithm - >>> draft-cc-lsr-flooding-reduction-08 Working Group Adoption Call >>> >>> >>> >>> >>> >>> Yes and I have started reviewing the LSR mail archives as I am late in >>> the discussion for this. >>> >>> >>> >>> If you have link to any particular dates in the archives would be >>> helpful. >>> >>> >>> >>> No =E2=80=93 it was more an =E2=80=9Cevolution=E2=80=9D than an =E2=80= =9Cepiphany=E2=80=9D. >>> >>> >>> >>> That sums up all the questions I have so if all answered in the archive= s >>> then I am all set. >>> >>> >>> >>> I support the draft moving forward as flood reduction is a much needed >>> feature. >>> >>> >>> >>> I think overall both drafts will really help large data centers with an= y >>> overlay underlay vxlan spine leaf meshed CLOS highly meshed topology th= at >>> scales out horizontally with a large spine footprint - this is a much m= uch >>> needed feature. This also helps eliminate complexity of the workaround= of >>> using BGP in the underlay which to me adds tremendous complexity. >>> >>> >>> >>> Here is the other recently presented dynamic flooding draft. >>> >>> >>> >>> >>> https://datatracker.ietf.org/doc/draft-chen-lsr-dynamic-flooding-algori= thm/ >>> >>> >>> >>> You can see they both make use of the dynamic flooding infra in >>> https://datatracker.ietf.org/doc/draft-ietf-lsr-dynamic-flooding/ >>> >>> >>> >>> Thanks, >>> >>> Acee >>> >>> >>> >>> >>> >>> >>> >>> >>> >>> Kind regards >>> >>> >>> >>> Gyan >>> >>> >>> >>> On Thu, May 21, 2020 at 4:07 PM Acee Lindem (acee) >>> wrote: >>> >>> Speaking as WG Co-chair: >>> >>> >>> >>> Hi Gyan, >>> >>> >>> >>> I guess you=E2=80=99ve joined this discussion late. It might be a good = idea to >>> review the LSR mailing list archives. >>> >>> >>> >>> *From: *Gyan Mishra >>> *Date: *Thursday, May 21, 2020 at 1:51 PM >>> *To: *Huaimo Chen >>> *Cc: *Acee Lindem , "lsr@ietf.org" >>> *Subject: *Re: [Lsr] Flooding Topology Computation Algorithm - >>> draft-cc-lsr-flooding-reduction-08 Working Group Adoption Call >>> >>> >>> >>> >>> >>> >>> >>> On Thu, May 21, 2020 at 11:01 AM Huaimo Chen >>> wrote: >>> >>> Hi Gyan, >>> >>> >>> >>> Thanks much for your questions. >>> >>> >>> >>> Gyan> How does this draft compare to the WG LC draft for flood >>> reduction. Would they be two eventual standard options in the operator= s >>> toolbox or competing features for optimized flood reduction. Would hav= ing >>> two flood reduction features standardized versus one default IGP flood >>> reduction feature be confusing for operators. Just as it was confusing= to >>> me.. >>> >>> https://datatracker.ietf.org/doc/draft-ietf-lsr-dynamic-flooding/ >>> >>> >>> >>> >>> [HC]: This draft plus the draft for flooding reduction can provide >>> two modes of flooding reductions (i.e., centralized mode and distribute= d >>> mode). The latter describes the two modes, but does not include any >>> flooding topology computation algorithm for the distributed mode. The >>> former proposes a flooding topology computation algorithm to be used in >>> the distributed mode. >>> >>> >>> >>> Gyan> It maybe a good idea for both documents to reference each othe= r >>> as to how they play together or in some respects if any provide a >>> homogeneous complete holistic solution for flooding problem being solve= d. >>> >>> >>> >>> It is a good idea to have this new draft reference the dynamic-flooding >>> but not vice-versa. The existing dynamic flooding draft provides a >>> framework for any dynamic flooding algorithm that provides a separate >>> flooding topology. This algorithm is just the first to be formally prop= osed >>> in a draft. Note that another algorithm was presented during the LSR >>> virtual interim which replaced IETF 107. >>> >>> >>> >>> In my opinion it may not be a bad idea even to combine both drafts so >>> the solution is complete and holistic. This will also make the overall >>> specification flow nicely. >>> >>> >>> >>> No =E2=80=93 we=E2=80=99re not going to do this. >>> >>> >>> >>> Thanks, >>> >>> Acee >>> >>> >>> >>> I know that efforts were made by LSR to have a common IGP solution, >>> however there are many inherent differences between ISIS and OSPF that = from >>> IGP Link state protocol perspective you can treat like apples to apples= but >>> really it=E2=80=99s apples and oranges. Maybe it might we wise to have= separate >>> draft for both and have references linking together as the same algorit= hm >>> concept and mathematically however the actual code implementation would >>> vary as the LSDB link state data structures are completely different. >>> >>> >>> >>> Later =3D Dynamic flooding =3D 2 modes Centralized leader based and >>> distributed >>> >>> >>> >>> https://datatracker.ietf.org/doc/draft-ietf-lsr-dynamic-flooding/ >>> >>> >>> >>> This later draft per section excerpt provides both centralized and >>> distributed algorithm see below >>> >>> >>> >>> *6.4 . Area Leader Responsibilities* >>> >>> >>> >>> If the Area Leader operates in centralized mode, it MUST advertise >>> >>> algorithm 0 in its Area Leader Sub-TLV.. In order for Dynamic >>> >>> Flooding to be enabled it also MUST compute and advertise a flooding >>> >>> topology for the area. The Area Leader may update the flooding >>> >>> topology at any time, however, it should not destabilize the network >>> >>> with undue or overly frequent topology changes. If the Area Leader >>> >>> operates in centralized mode and needs to advertise a new flooding >>> >>> topology, it floods the new flooding topology on both the new and ol= d >>> >>> flooding topologies. >>> >>> >>> >>> If the Area Leader operates in distributed mode, it MUST advertise a >>> >>> non-zero algorithm in its Area Leader Sub-TLV. >>> >>> >>> >>> When the Area Leader advertises algorithm 0 in its Area Leader Sub- >>> >>> TLV and does not advertise a flooding topology, Dynamic Flooding is >>> >>> disabled for the area. Note this applies whether the Area Leader >>> >>> intends to operate in centralized mode or in distributed mode. >>> >>> >>> >>> Note that once Dynamic Flooding is enabled, disabling it risks >>> >>> destabilizing the network. >>> >>> >>> >>> *6.5 . Distributed Flooding Topology Calculation* >>> >>> >>> >>> If the Area Leader advertises a non-zero algorithm in its Area Leade= r >>> >>> Sub-TLV, all nodes in the area that support Dynamic Flooding and the >>> >>> value of algorithm advertised by the Area Leader MUST compute the >>> >>> flooding topology based on the Area Leader's advertised algorithm. >>> >>> >>> >>> Nodes that do not support the value of algorithm advertised by the >>> >>> Area Leader MUST continue to use standard flooding mechanism as >>> >>> defined by the protocol. >>> >>> >>> >>> Nodes that do not support the value of algorithm advertised by the >>> >>> Area Leader MUST be considered as Dynamic Flooding incapable nodes b= y >>> >>> the Area Leader. >>> >>> >>> >>> If the value of the algorithm advertised by the Area Leader is from >>> >>> the range 128-254 (private distributed algorithms), it is the respon= sibility of the >>> >>> network operator to guarantee that all nodes in the area have a common = understanding of what the given algorithm value represents. >>> >>> >>> >>> Former =3D WG LC >>> >>> https://datatracker.ietf.org/doc/html/draft-cc-lsr-flooding-reduction-0= 8 >>> >>> >>> >>> Provides algorithm for distributed mode for this draft as well as the >>> algorithm to be used for distributed mode later dynamic flooding draft >>> >>> >>> >>> Separate question- >>> >>> >>> >>> In light of the flooding algorithm and seeing that at the bottom of >>> section 6.5 mentions flooding algorithm are the IANA codepoints reserve= d >>> for flooding unique and non overlapping with the flex algo codepoints I >>> believe 0-127. I would think the flooding algorithm range of values is >>> completely separate since a different function then flex algo values. >>> >>> >>> >>> https://datatracker.ietf.org/doc/html/draft-ietf-lsr-flex-algo-07 >>> >>> >>> >>> >>> >>> Best Regards, >>> >>> Huaimo >>> ------------------------------ >>> >>> *From:* Gyan Mishra >>> *Sent:* Thursday, May 21, 2020 10:36 AM >>> >>> >>> *To:* Huaimo Chen >>> *Cc:* Acee Lindem (acee) ; lsr@ietf.= org >>> >>> *Subject:* Re: [Lsr] Flooding Topology Computation Algorithm - >>> draft-cc-lsr-flooding-reduction-08 Working Group Adoption Call >>> >>> >>> >>> >>> >>> >>> >>> On Wed, May 20, 2020 at 11:59 PM Huaimo Chen >>> wrote: >>> >>> Hi Gyan, >>> >>> >>> >>> Thanks much for your questions. My answers are inline below with >>> [HC]. >>> >>> >>> >>> Best Regards, >>> >>> Huaimo >>> ------------------------------ >>> >>> *From:* Gyan Mishra >>> *Sent:* Wednesday, May 20, 2020 11:14 AM >>> *To:* Huaimo Chen >>> *Cc:* Acee Lindem (acee) ; lsr@ietf.= org >>> >>> *Subject:* Re: [Lsr] Flooding Topology Computation Algorithm - >>> draft-cc-lsr-flooding-reduction-08 Working Group Adoption Call >>> >>> >>> >>> Huaimo >>> >>> >>> >>> This is a much needed feature that operators have been needing for >>> densely meshed topologies that commonly exist in data centers to >>> accommodate very high bandwidth E-W traffic. >>> >>> [HC]: Thank you very much. >>> >>> >>> >>> Below is link from Cisco which has introduced feature for dynamic >>> flooding in clos high density ECMP data center topologies. >>> >>> >>> >>> Please look at the feature description and it does seem to be exactly >>> the same as this draft. Please confirm. >>> >>> [HC]: It seems different. >>> >>> >>> >>> There maybe other vendors due to industry demand have to get the featur= e >>> deployed before it reaches standards vendor consensus with the IETF. >>> >>> >>> >>> >>> https://www.cisco.com/c/en/us/products/collateral/switches/nexus-9000-s= eries-switches/white-paper-c11-743015.html >>> >>> >>> >>> >>> We are testing this feature and planning to deploy but wanted to ensure >>> that this is the same as the draft on the standards track. >>> >>> [HC]: The feature appears implemented draft "Dynamic Flooding on Dense >>> Graphs", which does not include any flooding topology computation >>> algorithm.. >>> >>> >>> >>> Gyan> How does this draft compare to the WG LC draft for flood >>> reduction. Would they be two eventual standard options in the operator= s >>> toolbox or competing features for optimized flood reduction. Would hav= ing >>> two flood reduction features standardized versus one default IGP flood >>> reduction feature be confusing for operators. Just as it was confusing= to >>> me. >>> >>> >>> >>> >>> >>> https://datatracker.ietf.org/doc/draft-ietf-lsr-dynamic-flooding/ >>> >>> >>> >>> >>> Kind regards >>> >>> >>> >>> Gyan >>> >>> >>> >>> >>> >>> On Tue, May 19, 2020 at 11:52 PM Huaimo Chen >>> wrote: >>> >>> Hi Gyan, >>> >>> >>> >>> Thank you very much for your questions and support. >>> >>> >>> >>> This Flooding Topology Computation algorithm can be used in the >>> Dynamic Flooding on Dense Graphs to compute the flooding topologies for >>> the data center clos dense meshed topologies with many ECMP paths. It c= an >>> be used by the area leader in the centralized mode to compute the flood= ing >>> topology. >>> >>> >>> >>> Best Regards, >>> >>> Huaimo >>> ------------------------------ >>> >>> *From:* Lsr on behalf of Gyan Mishra < >>> hayabusagsm@gmail.com> >>> *Sent:* Tuesday, May 19, 2020 2:39 AM >>> *To:* Yanhe Fan >>> *Cc:* lsr@ietf.org ; Acee Lindem (acee) >> 40cisco.com@dmarc.ietf.org> >>> *Subject:* Re: [Lsr] Flooding Topology Computation Algorithm - >>> draft-cc-lsr-flooding-reduction-08 Working Group Adoption Call >>> >>> >>> >>> >>> >>> I support WG adoption and have a few questions related to the draft. >>> >>> >>> >>> Does this flooding algorithm use the dynamic flooding algorithm used in >>> data center clos dense meshed topologies with many ECMP paths where the >>> flood is decoupled from the physical topology. In the dynamic flooding >>> algorithm mentioned in centralized mode the flooding is computed by the >>> area leader and distributed to all nodes. In distributed mode each mod= e >>> the area leader determines the algorithm and then each node computes th= e >>> flooding topology based on the algorithm. >>> >>> >>> >>> This dynamic algorithm for optimized flood reduction would reduce the >>> amount of redundant flooding in highly densely meshed ospf or Isis >>> topologies. So this optimization of flooding would improving overall l= ink >>> state routing protocol convergence. >>> >>> >>> >>> Gyan >>> >>> >>> >>> On Mon, May 18, 2020 at 3:37 PM Yanhe Fan wrote= : >>> >>> Support it as a co-author. >>> >>> >>> >>> Thanks, >>> >>> Yanhe >>> >>> >>> >>> *From:* Lsr *On Behalf Of *Acee Lindem (acee) >>> *Sent:* Friday, May 15, 2020 3:40 PM >>> *To:* lsr@ietf.org >>> *Subject:* [Lsr] Flooding Topology Computation Algorithm - >>> draft-cc-lsr-flooding-reduction-08 Working Group Adoption Call >>> >>> >>> >>> This begins a 3 week (due to holidays) WG adoption call for the >>> =E2=80=9CFlooding Topology Computation Algorithm=E2=80=9D draft. Please= issue your support >>> or objection to this list by 11:59 PM, UTC on June 5th, 2020. Here is a >>> URL for your convenience. >>> >>> >>> >>> https://datatracker.ietf.org/doc/draft-cc-lsr-flooding-reduction/ >>> >>> >>> >>> >>> Thanks, >>> Acee >>> >>> _______________________________________________ >>> Lsr mailing list >>> Lsr@ietf.org >>> https://www..ietf.org/mailman/listinfo/lsr >>> >>> >>> -- >>> >>> *Error! Filename not specified.* >>> >>> >>> *Gyan >>> Mishra* >>> >>> >>> *Network >>> Solutions Architect * >>> >>> >>> >>> *M 301 502-1347 13101 Columbia Pike >>> >>> *Silver Spring, MD >>> >>> >>> >>> >>> -- >>> >>> *Error! Filename not specified.* >>> >>> >>> *Gyan Mishra* >>> >>> *Network Solutions Architect * >>> >>> >>> >>> *M 301 502-1347 >>> 13101 >>> Columbia Pike >>> >>> *Silver Spring, MD >>> >>> >>> >>> >>> -- >>> >>> *Error! Filename not specified.* >>> >>> >>> *Gyan Mishra* >>> >>> *Network Solutions Architect * >>> >>> >>> >>> *M 301 502-1347 13101 Columbia Pike >>> >>> *Silver Spring, MD >>> >>> >>> >>> >>> >>> >>> -- >>> >>> *Error! Filename not specified.* >>> >>> *Gyan Mishra* >>> >>> *Network Solutions Architect * >>> >>> >>> >>> *M 301 502-1347 13101 Columbia Pike >>> >>> *Silver Spring, MD >>> >>> >>> >>> >>> >>> >>> -- >>> >>> [image: Image removed by sender.] >>> >>> *Gyan Mishra* >>> >>> *Network Solutions Architect * >>> >>> >>> >>> *M 301 502-1347 13101 Columbia Pike >>> >>> *Silver Spring, MD >>> >>> >>> >>> >>> >>> >> -- >> >> >> >> *Gyan Mishra* >> >> *Network Solutions A**rchitect * >> >> >> >> *M 301 502-134713101 Columbia Pike *Silver Spring, MD >> >> -- > > > > *Gyan Mishra* > > *Network Solutions A**rchitect * > > > > *M 301 502-134713101 Columbia Pike *Silver Spring, MD > > _______________________________________________ > Lsr mailing list > Lsr@ietf.org > https://www.ietf.org/mailman/listinfo/lsr > --000000000000863e2305a633d200 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hi,= Gyan,

I presented=C2=A0<= a href=3D"https://www.ietf.org/id/draft-chen-lsr-dynamic-flooding-algorithm= -00.html" target=3D"_blank">https://www.ietf.org/id/draft-chen-lsr-dynamic-= flooding-algorithm-00.html=C2=A0in the last IETF. You may find the slid= es below helpful in understanding the algorithm:

https://datatracker.ietf.org/meeting/interim-2020-lsr-0= 1/materials/slides-interim-2020-lsr-01-sessa-2-dynamic-flooding-algo-sarah.= pdf

Thanks,
Sarah

On Thu, May 2= 1, 2020 at 7:32 PM Gyan Mishra <hayabusagsm@gmail.com> wrote:

I see the diagrams A= ppendix A - =C2=A0reviewing=C2=A0

Thanks=C2=A0

G= yan

On Thu, May 21, 2020 at 10:13 PM Gyan Mishra <hayabusagsm@gmail.com> wrot= e:

I think for both drafts it would be good to have a stic= k diagram at a minimum. =C2=A0

I majored in EE with math =C2=A0minor and both drafts are hard to fo= llow without a diagram with labels showing the exact topology examples. =C2= =A0

Four main topologies= - full mesh, partial mesh and leaf spine ( 2 tier) and CLOS ( 3 tier) - re= al world scenario=E2=80=99s.

From the interim meeting was their a slide deck visual topology shared= ?=C2=A0

That would help.=

4.1=C2=A0

Step 1 - Build Cq candidate queue=C2=A0

For each node B on FT whose D is one (from minimum to maximum
       node ID), find a link L attached to B such that L's remote node =
R
       has minimum D and ID, add link L between B and R into FT and
       increase B's D and R's D by one.  Return FT.
My interpretation is the algorithm an iterative loop and star= ts with any node in the candidate list so could start from edge and work le= ft to right or vice versa.=C2=A0 For loop to build FT from Cq =3D with each= node B with directly attached node R via link L.=C2=A0 Increment node B fr= om Cq until the FT is build for all nodes.=C2=A0 Instead of starting with a= wide diameter FT matching physical topology we start micro topology with D= =3D1 and go node by node.

4.2=C2=A0

1.  Finding and removing the first element with no=
de A in Cq that is
       not on FT and one PH's D in PHs < MaxD and PH's D < PH=
's ConMaxD.

       If A is root R0, then add the element into FT

       otherwise  (i.e., A !=3D R0 with one PH's D in PHs < MaxD and=
 PH's
          D < PH's ConMaxD.  Assume that PH is the first one in PHs
          whose D < MaxD and PH's D < PH's ConMaxD), PH's=
 D++, and add A
          with D =3D 1 and PHs =3D {PH} into FT.

       Note:  if there is no element with a node in Cq satisfying the
          conditions, then algorithm may be restarted from R0, ++MaxD,
          Cq =3D {(R0,D=3D0,PHs =3D { })}, FT =3D { };
This is similar to 4.1 with micro topology with 2 directly connec= ted nodes=C2=A0

My interpreta= tion of the algorithm from the verbiage.

<= div dir=3D"auto">So this draft starts in the middle of the topology and is = geared towards leaf spine 2 or 3 tier clos topology.

For this one we build the bi graph so that cou= ld be leaf connected to two spines or spine connected to two leafs and iter= atively build out the FT topology 3 node arch =C2=A0spine leaf spine or lea= f spine leaf.

Kind regar= ds=C2=A0

Gyan
=
On Thu= , May 21, 2020 at 7:01 PM Acee Lindem (acee) <acee@cisco.com> wrote:

Hi Gyan,

=C2=A0

From: Gyan Mishra <hayabusagsm@gmail.com= >
Date: Thursday, May 21, 2020 at 4:20 PM
To: Acee Lindem <acee@cisco.com>
Cc: Huaimo Chen <huaimo.chen@futurewei.com>, "lsr@ietf.org" <lsr@ietf.org>
Subject: Re: [Lsr] Flooding Topology Computation Algorithm - draft-c= c-lsr-flooding-reduction-08 Working Group Adoption Call

=C2=A0

=C2=A0

Yes and I have started r= eviewing the LSR mail archives as I am late in the discussion for this.<= /u>

=C2=A0

If you have link to any = particular dates in the archives would be helpful.

=C2=A0

No =E2=80=93 it was more an =E2=80=9Cevolution=E2=80= =9D than an =E2=80=9Cepiphany=E2=80=9D.

=C2=A0

That sums up all the que= stions I have so if all answered in the archives then I am all set.<= u>

=C2=A0

I support the draft movi= ng forward as flood reduction is a much needed feature. =C2=A0

=C2=A0

I think overall both dra= fts will really help large data centers with any overlay underlay vxlan spi= ne leaf meshed CLOS highly meshed topology that scales out horizontally wit= h a large spine footprint - this is a much much needed feature.=C2=A0 This also helps eliminate complexity of th= e workaround of using BGP in the underlay which to me adds tremendous compl= exity.

=C2=A0

Here is the other recently presented dynamic floodin= g draft.

=C2=A0

https://datatracker.i= etf.org/doc/draft-chen-lsr-dynamic-flooding-algorithm/

=C2=A0

You can see they both make use of the dynamic floodi= ng infra in https://datatracker.ietf.org/doc/draft-ietf-lsr-dynami= c-flooding/

=C2=A0

Thanks,

Acee

=C2=A0

=C2=A0

=C2=A0

=C2=A0

Kind regards=C2=A0

=C2=A0

Gyan=C2=A0=

=C2=A0

On Thu, May 21, 2020 at = 4:07 PM Acee Lindem (acee) <acee@cisco.com> wrote:

Speaking as WG Co-chair:

=C2=A0

Hi Gyan,

=C2=A0

I guess you=E2=80=99ve joined this discussion late. It might be a good idea= to review the LSR mailing list archives.

=C2=A0

From: Gyan Mishra <hayabusagsm@gmail.com>
Date: Thursday, May 21, 2020 at 1:51 PM
To: Huaimo Chen <huaimo.chen@futurewei.com>
Cc: Acee Lindem <acee@cisco.com>, "lsr@ietf.org" <lsr@ietf.org>
Subject: Re: [Lsr] Flooding Topology Computation Algorithm - draft-c= c-lsr-flooding-reduction-08 Working Group Adoption Call

=C2=A0

=C2=A0

=C2=A0

On Thu, May 21, 2020 at 11:01 AM Huaimo Chen <huaimo.chen@futurewei.com> wrot= e:

Hi Gyan,

=C2=A0

=C2=A0 =C2=A0 Thanks much for yo= ur questions.

=C2=A0

=C2=A0Gyan> How does this dra= ft compare to the WG LC draft for flood reduction.=C2=A0 Would they be two = eventual standard options in the operators toolbox =C2=A0or competing featu= res for optimized flood reduction. Would having two flood reduction features standardized versus one default IGP flood reducti= on feature be confusing for operators.=C2=A0 Just as it was confusing to me= ..=C2=A0

=C2=A0

=C2=A0 =C2=A0 [HC]: This draft p= lus the draft for flooding reduction can provide two modes of flooding redu= ctions (i.e., centralized mode and distributed mode). The latter describes = the two modes, but does not include any flooding topology computation algorithm for the distributed mode. The former propos= es a=C2=A0flooding topology computat= ion algorithm to be used in the distributed mode.=C2=A0=C2=A0=

=C2=A0

=C2=A0 =C2=A0Gyan> It maybe a good idea for both documents to reference = each other as to how they play together or =C2=A0in some respects if any pr= ovide a homogeneous complete holistic solution for flooding problem being s= olved. =C2=A0

=C2=A0

It is a good idea to have this new draft reference the dynamic-flooding but= not vice-versa. The existing dynamic flooding draft provides a framework f= or any dynamic flooding algorithm that provides a separate flooding topolog= y. This algorithm is just the first to be formally proposed in a draft. Note that another algorithm was presen= ted during the LSR virtual interim which replaced IETF 107. =C2=A0

=C2=A0

In my opinion it may not be a bad idea even to combine both drafts so the s= olution is complete and holistic.=C2=A0 This will also make the overall spe= cification flow nicely. =C2=A0

=C2=A0

No =E2=80=93 we=E2=80=99re not going to do this.

=C2=A0

Thanks,

Acee

=C2=A0

I know that efforts were made by LSR to have a common IGP solution, however= there are many inherent differences between ISIS and OSPF that from IGP Li= nk state protocol perspective you can treat like apples to apples but reall= y it=E2=80=99s apples and oranges.=C2=A0 Maybe it might we wise to have separate draft for both and have references linki= ng together as the same algorithm concept and mathematically however the ac= tual code implementation would vary as the LSDB link state data structures = are completely different.=C2=A0

=C2=A0

Later =3D Dynamic flooding =3D 2 modes Centralized leader based and distrib= uted=C2=A0

=C2=A0

This later draft per section excerpt provides both centralized and distribu= ted algorithm see below=C2=A0

=C2=A0

6.4.=C2=A0 Area Leader Responsibilities
=C2=A0
=C2=A0=C2=A0 If the Area Leader operates in central=
ized mode, it MUST advertise<=
u style=3D"font-family:monospace">
=C2=A0=C2=A0 algorithm 0 in its Area Leader Sub-TLV=
..=C2=A0 In order for Dynamic=

=C2=A0=C2=A0 Flooding to be enabled it also MUST co=
mpute and advertise a flooding
=C2=A0=C2=A0 topology for the area.=C2=A0 The Area =
Leader may update the flooding
=C2=A0=C2=A0 topology at any time, however, it shou=
ld not destabilize the network
=C2=A0=C2=A0 with undue or overly frequent topology=
 changes.=C2=A0 If the Area Leader
=C2=A0=C2=A0 operates in centralized mode and needs=
 to advertise a new flooding<=
u style=3D"font-family:monospace">
=C2=A0=C2=A0 topology, it floods the new flooding t=
opology on both the new and old
=C2=A0=C2=A0 flooding topologies.
=C2=A0
=C2=A0=C2=A0 If the Area Leader operates in distrib=
uted mode, it MUST advertise a
=C2=A0=C2=A0 non-zero algorithm in its Area Leader =
Sub-TLV.
=C2=A0
=C2=A0=C2=A0 When the Area Leader advertises algori=
thm 0 in its Area Leader Sub-=

=C2=A0=C2=A0 TLV and does not advertise a flooding =
topology, Dynamic Flooding is=

=C2=A0=C2=A0 disabled for the area.=C2=A0 Note this=
 applies whether the Area Leader<=
/u>
=C2=A0=C2=A0 intends to operate in centralized mode=
 or in distributed mode.
=C2=A0
=C2=A0=C2=A0 Note that once Dynamic Flooding is ena=
bled, disabling it risks
=C2=A0=C2=A0 destabilizing the network.

=C2=A0


6.5.=C2=A0 Distributed Flooding Topology Calculation<=
u style=3D"font-family:monospace">


=C2=A0


=C2=A0=C2=A0 If the Area Leader advertises a non-ze=
ro algorithm in its Area Leader


=C2=A0=C2=A0 Sub-TLV, all nodes in the area that su=
pport Dynamic Flooding and the


=C2=A0=C2=A0 value of algorithm advertised by the A=
rea Leader MUST compute the


=C2=A0=C2=A0 flooding topology based on the Area Le=
ader's advertised algorithm.<=
/u>


=C2=A0


=C2=A0=C2=A0 Nodes that do not support the value of=
 algorithm advertised by the<=
u style=3D"font-family:monospace">


=C2=A0=C2=A0 Area Leader MUST continue to use stand=
ard flooding mechanism as


=C2=A0=C2=A0 defined by the protocol.

=C2=A0


=C2=A0=C2=A0 Nodes that do not support the value of=
 algorithm advertised by the<=
u style=3D"font-family:monospace">


=C2=A0=C2=A0 Area Leader MUST be considered as Dyna=
mic Flooding incapable nodes by


=C2=A0=C2=A0 the Area Leader.


=C2=A0


=C2=A0=C2=A0 If the value of the algorithm advertis=
ed by the Area Leader is from=



=C2=A0=C2=A0 the range 128-254 (private distributed=
 algorithms), it is the responsibility of the=C2=A0


network operator to guarantee that all nodes in the area have a common u=
nderstanding of what the given algorithm value represents.

=C2=A0

Former =3D WG LC=C2=A0

Provides algorithm for distributed mode for this draft as well as the algor= ithm to be used for distributed mode later dynamic flooding draft=C2=A0<= /u>

=C2=A0

Separate question-

=C2=A0

In light of the flooding algorithm and seeing that at the bottom of section= 6.5 mentions flooding algorithm are the IANA codepoints reserved for flood= ing unique and non overlapping with the flex algo codepoints I believe 0-12= 7.=C2=A0 I would think the flooding algorithm range of values is completely separate since a different function then fle= x algo values.

=C2=A0

=C2=A0

Best Regards,

Huaimo

From:= Gyan Mishra <hayabusagsm@gmail.com>
Sent: Thursday, May 21, 2020 10:36 AM


To: Huaimo Chen <huaimo.chen@futurewei.com>
Cc: Acee Lindem (acee) <acee=3D40cisco.com@dmarc.ietf.org>; lsr@ietf.org <lsr@ietf.org>
Subject: Re: [Lsr] Flooding Topology Computation Algorithm - draft-c= c-lsr-flooding-reduction-08 Working Group Adoption Call

=C2=A0

=C2=A0

=C2=A0

On Wed, May 20, 2020 at 11:59 PM Huaimo Chen <huaimo.chen@futurewei.com> wrot= e:

Hi Gyan,

=C2=A0

=C2=A0 =C2=A0 Thanks much for yo= ur questions. My answers are inline below with [HC].

=C2=A0

Best Regards,

Huaimo

From:= Gyan Mishra <hayabusagsm@gmail.com>
Sent: Wednesday, May 20, 2020 11:14 AM
To: Huaimo Chen <huaimo.chen@futurewei.com>
Cc: Acee Lindem (acee) <acee=3D40cisco.com@dmarc.ietf.org>; lsr@ietf.org <lsr@ietf.org>
Subject: Re: [Lsr] Flooding Topology Computation Algorithm - draft-c= c-lsr-flooding-reduction-08 Working Group Adoption Call

=C2=A0

Huaimo=C2=A0

=C2=A0

This is a much needed feature that operators have been needing for densely = meshed topologies that commonly exist in data centers to accommodate very h= igh bandwidth E-W traffic.

[HC]: Thank you very much.

=C2=A0

Below is link from Cisco which has introduced feature for dynamic flooding = in clos high density ECMP data center topologies.

=C2=A0

Please look at the feature description and it does seem to be exactly the s= ame as this draft.=C2=A0 Please confirm.=C2=A0

[HC]: It seems different.=C2=A0

=C2=A0

There maybe other vendors due to industry demand have to get the feature de= ployed before it reaches standards vendor consensus with the IETF.

=C2=A0

=C2=A0

We are testing this feature and planning to deploy but wanted to ensure tha= t this is the same as the draft on the standards track.

[HC]: The feature appear= s implemented draft "Dynamic Flooding on Dense Graphs", which doe= s not include any flooding topology computation algorithm..=C2=A0=

=C2=A0

=C2=A0 =C2=A0 Gyan> How does this draft compare to the WG LC draft for f= lood reduction.=C2=A0 Would they be two eventual standard options in the op= erators toolbox =C2=A0or competing features for optimized flood reduction. = Would having two flood reduction features standardized versus one default IGP flood reduction feature be confusing for operators.= =C2=A0 Just as it was confusing to me.

=C2=A0

=C2=A0

Kind regards=C2=A0

=C2=A0

Gyan

=C2=A0

=C2=A0

On Tue, May 19, 2020 at 11:52 PM Huaimo Chen <huaimo.chen@futurewei.com> wrot= e:

Hi = Gyan,

=C2=A0

=C2= =A0 =C2=A0 Thank you very much for your questions and support.

=C2=A0

=C2= =A0 =C2=A0 This Flooding Topology Comput= ation algorithm can be used in the Dynamic Flooding on Dense Graphs to compute the flooding topologies for the=C2=A0data cente= r clos dense meshed topologies with many ECMP paths. It can be used by the = area leader in the centralized mode to compute the flooding topology. =C2= =A0=C2=A0

=C2=A0

Bes= t Regards,

Hua= imo

From:= Lsr <lsr-boun= ces@ietf.org> on behalf of Gyan Mishra <hayabusagsm@gmail.com>
Sent: Tuesday, May 19, 2020 2:39 AM
To: Yanhe Fan <yfan@casa-systems.com>
Cc: lsr@ietf.org <lsr@ietf.org&g= t;; Acee Lindem (acee) <acee=3D40cisco.com@dmarc.ietf.org>
Subject: Re: [Lsr] Flooding Topology Computation Algorithm - draft-c= c-lsr-flooding-reduction-08 Working Group Adoption Call

=C2=A0

=C2=A0

I support WG adoption and have a few questions related to the draft.=

=C2=A0

Does this flooding algorithm use the dynamic flooding algorithm used in dat= a center clos dense meshed topologies with many ECMP paths where the flood = is decoupled from the physical topology.=C2=A0 In the dynamic flooding algo= rithm mentioned in centralized mode the flooding is computed by the area leader and distributed to all nodes.=C2= =A0 In distributed mode each mode the area leader determines the algorithm = and then each node computes the flooding topology based on the algorithm. = =C2=A0

=C2=A0

This dynamic algorithm for optimized flood reduction would reduce the amoun= t of redundant flooding in highly densely meshed ospf or Isis topologies.= =C2=A0 So this optimization of flooding would improving overall link state = routing protocol convergence.

=C2=A0

Gyan=C2=A0

=C2=A0

On Mon, May 18, 2020 at 3:37 PM Yanhe Fan <yfan@casa-systems.com> wrote:

Support it as a co-author.

=C2=A0

Thanks,

Yanhe

_______________________________________________
Lsr mailing list
Lsr@ietf.org
https://www= ..ietf.org/mailman/listinfo/lsr

--

Error! Filename not specified.

Gyan Mishra

Network Soluti= ons Architect=C2=A0

M 301 502-1347
13101 Columbia Pike=C2=A0
Silver Spring, MD

=C2=A0

--

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Gyan Mishra

Network Solutions = Architect=C2=A0

M 301 502-1347
= 13101 Columbia Pike=C2=A0
Silver Spring, MD

=C2=A0

--

<= /div>
<= div>

Gyan Mishra

Network Solutions = Architect=C2=A0

M 301 502-1347
13101 Columbia Pike=C2=A0
Silver Spring, MD

<= a href=3D"https://www.google.com/maps/search/13101+Columbia+Pike+%0D%0A+Sil= ver+Spring,+MD?entry=3Dgmail&source=3Dg" target=3D"_blank">

=C2=A0

--

Gyan Mishra

Network Solutions = Architect=C2=A0

M 301 502-1347
13101 Columbia Pike=C2=A0
Silver Spring, MD

<= a href=3D"https://www.google.com/maps/search/13101+Columbia+Pike+%0D%0A+Sil= ver+Spring,+MD?entry=3Dgmail&source=3Dg" target=3D"_blank">

=C2=A0

--

3D"Image

Gyan Mishra

Network Solutions = Architect=C2=A0

M 301 502-1347
13101 Columbia Pike=C2=A0
Silver Spring, MD

<= a href=3D"https://www.google.com/maps/search/13101+Columbia+Pike+%0D%0A+Sil= ver+Spring,+MD?entry=3Dgmail&source=3Dg" target=3D"_blank">

=C2=A0

--


Network Solutions Architect=C2=A0

M 301 502-1= 347
13101 Columbia Pike=C2=A0
Silver Spring, MD

<= div>
--


Network Solutions Architect=C2=A0

M 301 502-1= 347
13101 Columbia Pike=C2=A0
Silver Spring, MD

<= div>
_______________________________________________
Lsr mailing list
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--000000000000863e2305a633d200-- From nobody Thu May 21 20:36:51 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id E89323A0E40 for ; Thu, 21 May 2020 20:36:48 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.086 X-Spam-Level: X-Spam-Status: No, score=-2.086 tagged_above=-999 required=5 tests=[AC_DIV_BONANZA=0.001, BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_REMOTE_IMAGE=0.01, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id PC_YfY3zoQzJ for ; Thu, 21 May 2020 20:36:45 -0700 (PDT) Received: from mail-il1-x12a.google.com (mail-il1-x12a.google.com [IPv6:2607:f8b0:4864:20::12a]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id DBF683A0E3D for ; Thu, 21 May 2020 20:36:44 -0700 (PDT) Received: by mail-il1-x12a.google.com with SMTP id b15so9367728ilq.12 for ; Thu, 21 May 2020 20:36:44 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=OTDX+WAbhFeCIYla9mC54abkamF8c6cRWDWe5ZEkt5A=; b=V1R9QVTj78GlIigYPzf1D1LyFXbzfaE3CffSVSSzGmXYoZNBFVfmxTCV/bJpnOvYxx QdgumVcmQYtklsW80sOn3PW9Cvqifq/N1A/FkFTYpxXGBzK+qEoFTrlw1rhk2ezgfVpd dpKBbBaxM50Rx6XJbGwsI6+ItE445WchR0Ycmq8AGONfRl6+wE4ZVl9hIdTy7kFqJZ9B IYOO7lRnBoHyysDezTx7yMR/TxdSi5XRlLOTt6NUziB/SyA+ve/wjD2hOYqjHfxktilP zTd25veEVKhXYZfvraSsWWpkT6zLk34ZF3YCSC1XHN77t3bccwsmMOwM8CUinOypi3Wq Zy8g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=OTDX+WAbhFeCIYla9mC54abkamF8c6cRWDWe5ZEkt5A=; b=JbOm8oiCb/cRas0xy/QnUKfYh0mB0kOyZdaSGSbiHr0M0gG5cXQNQTp88QSwQGScVi IAyDT9E/H5peDJTZGDmC3xJgliHaTQoMUrmRQSKKJvzdcUz7ZYvYhewWoxWtjGpa8CXM rnuh0Vg3RmXnR8/bzy9uysl/Ks0d8qPYP20mlzpS7VqIaUvrDoS9MOKMx3D1bO4ho3Sf t9ptdAOBCWNDLJ9HFVoMlLQ7VWKKmEO4ybN7vz6NePhnlP+fJrCS3ZXVHy0A73aZeI/J l+74E0RP0jF9zng3AbgSmmTJl5+lImHr45nqI8DMkeOxLrV/7V5/rEhpZNRXDRwlmc/f wzJA== X-Gm-Message-State: AOAM532iDNK/fugM+Xy9oMi8xmIGp6r4NXc7WHXrWgAS+i0cxUON4gXk 29YshSx0N5cLv2OGKTQ4QUPS5TISN41HCj4YbwCVwXLu5EI= X-Google-Smtp-Source: ABdhPJw/z1DFo9ey8TdEdmBeI+uI4oUmCguNGMH+uX6DqfsygtayY5z9Cm7XBpaLdJwlm2y8NnOL2Lz/vi637gESJQk= X-Received: by 2002:a05:6e02:e8c:: with SMTP id t12mr11459506ilj.186.1590118604033; Thu, 21 May 2020 20:36:44 -0700 (PDT) MIME-Version: 1.0 References: <63330FD6-EDE8-4938-AA85-948279C57E34@cisco.com> <424B17B1-D66D-4708-A819-855E972841AF@cisco.com> In-Reply-To: From: Gyan Mishra Date: Thu, 21 May 2020 23:36:32 -0400 Message-ID: To: Sarah Chen Cc: "Acee Lindem (acee)" , Huaimo Chen , "lsr@ietf.org" Content-Type: multipart/alternative; boundary="0000000000008b54e005a63456b6" Archived-At: Subject: Re: [Lsr] Flooding Topology Computation Algorithm - draft-cc-lsr-flooding-reduction-08 Working Group Adoption Call X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 22 May 2020 03:36:49 -0000 --0000000000008b54e005a63456b6 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Great Thanks Sarah!! Gyan On Thu, May 21, 2020 at 10:59 PM Sarah Chen wrote: > Hi, Gyan, > > I presented > https://www.ietf.org/id/draft-chen-lsr-dynamic-flooding-algorithm-00.html= in > the last IETF. You may find the slides below helpful in understanding the > algorithm: > > > https://datatracker.ietf.org/meeting/interim-2020-lsr-01/materials/slides= -interim-2020-lsr-01-sessa-2-dynamic-flooding-algo-sarah.pdf > > Thanks, > Sarah > > On Thu, May 21, 2020 at 7:32 PM Gyan Mishra wrote= : > >> >> I see the diagrams Appendix A - reviewing >> >> Thanks >> >> Gyan >> > >> On Thu, May 21, 2020 at 10:13 PM Gyan Mishra >> wrote: >> > >>> I think for both drafts it would be good to have a stick diagram at a >>> minimum. >>> >>> I majored in EE with math minor and both drafts are hard to follow >>> without a diagram with labels showing the exact topology examples. >>> >>> Four main topologies - full mesh, partial mesh and leaf spine ( 2 tier) >>> and CLOS ( 3 tier) - real world scenario=E2=80=99s. >>> >>> From the interim meeting was their a slide deck visual topology shared? >>> >>> That would help. >>> >>> https://datatracker.ietf.org/doc/html/draft-cc-lsr-flooding-reduction-0= 8 >>> >>> 4.1 >>> >>> Step 1 - Build Cq candidate queue >>> >>> For each node B on FT whose D is one (from minimum to maximum >>> node ID), find a link L attached to B such that L's remote node = R >>> has minimum D and ID, add link L between B and R into FT and >>> increase B's D and R's D by one. Return FT. >>> >>> My interpretation is the algorithm an iterative loop and starts with an= y >>> node in the candidate list so could start from edge and work left to ri= ght >>> or vice versa. For loop to build FT from Cq =3D with each node B with >>> directly attached node R via link L. Increment node B from Cq until th= e FT >>> is build for all nodes. Instead of starting with a wide diameter FT >>> matching physical topology we start micro topology with D=3D1 and go no= de by >>> node. >>> >>> 4.2 >>> >>> 1. Finding and removing the first element with node A in Cq that is >>> not on FT and one PH's D in PHs < MaxD and PH's D < PH's ConMaxD= . >>> >>> If A is root R0, then add the element into FT >>> >>> otherwise (i.e., A !=3D R0 with one PH's D in PHs < MaxD and PH= 's >>> D < PH's ConMaxD. Assume that PH is the first one in PHs >>> whose D < MaxD and PH's D < PH's ConMaxD), PH's D++, and add = A >>> with D =3D 1 and PHs =3D {PH} into FT. >>> >>> Note: if there is no element with a node in Cq satisfying the >>> conditions, then algorithm may be restarted from R0, ++MaxD, >>> Cq =3D {(R0,D=3D0,PHs =3D { })}, FT =3D { }; >>> >>> This is similar to 4.1 with micro topology with 2 directly connected >>> nodes >>> >>> https://www.ietf.org/id/draft-chen-lsr-dynamic-flooding-algorithm-00.ht= ml >>> >>> My interpretation of the algorithm from the verbiage. >>> >>> So this draft starts in the middle of the topology and is geared toward= s >>> leaf spine 2 or 3 tier clos topology. >>> >>> For this one we build the bi graph so that could be leaf connected to >>> two spines or spine connected to two leafs and iteratively build out th= e FT >>> topology 3 node arch spine leaf spine or leaf spine leaf. >>> >>> Kind regards >>> >>> Gyan >>> >> >>> On Thu, May 21, 2020 at 7:01 PM Acee Lindem (acee) >>> wrote: >>> >> Hi Gyan, >>>> >>>> >>>> >>>> *From: *Gyan Mishra >>>> *Date: *Thursday, May 21, 2020 at 4:20 PM >>>> *To: *Acee Lindem >>>> *Cc: *Huaimo Chen , "lsr@ietf.org" < >>>> lsr@ietf.org> >>>> *Subject: *Re: [Lsr] Flooding Topology Computation Algorithm - >>>> draft-cc-lsr-flooding-reduction-08 Working Group Adoption Call >>>> >>>> >>>> >>>> >>>> >>>> Yes and I have started reviewing the LSR mail archives as I am late in >>>> the discussion for this. >>>> >>>> >>>> >>>> If you have link to any particular dates in the archives would be >>>> helpful. >>>> >>>> >>>> >>>> No =E2=80=93 it was more an =E2=80=9Cevolution=E2=80=9D than an =E2=80= =9Cepiphany=E2=80=9D. >>>> >>>> >>>> >>>> That sums up all the questions I have so if all answered in the >>>> archives then I am all set. >>>> >>>> >>>> >>>> I support the draft moving forward as flood reduction is a much needed >>>> feature. >>>> >>>> >>>> >>>> I think overall both drafts will really help large data centers with >>>> any overlay underlay vxlan spine leaf meshed CLOS highly meshed topolo= gy >>>> that scales out horizontally with a large spine footprint - this is a = much >>>> much needed feature. This also helps eliminate complexity of the >>>> workaround of using BGP in the underlay which to me adds tremendous >>>> complexity. >>>> >>>> >>>> >>>> Here is the other recently presented dynamic flooding draft. >>>> >>>> >>>> >>>> >>>> https://datatracker.ietf.org/doc/draft-chen-lsr-dynamic-flooding-algor= ithm/ >>>> >>>> >>>> >>>> You can see they both make use of the dynamic flooding infra in >>>> https://datatracker.ietf.org/doc/draft-ietf-lsr-dynamic-flooding/ >>>> >>>> >>>> >>>> Thanks, >>>> >>>> Acee >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> Kind regards >>>> >>>> >>>> >>>> Gyan >>>> >>>> >>>> >>>> On Thu, May 21, 2020 at 4:07 PM Acee Lindem (acee) >>>> wrote: >>>> >>>> Speaking as WG Co-chair: >>>> >>>> >>>> >>>> Hi Gyan, >>>> >>>> >>>> >>>> I guess you=E2=80=99ve joined this discussion late. It might be a good= idea to >>>> review the LSR mailing list archives. >>>> >>>> >>>> >>>> *From: *Gyan Mishra >>>> *Date: *Thursday, May 21, 2020 at 1:51 PM >>>> *To: *Huaimo Chen >>>> *Cc: *Acee Lindem , "lsr@ietf.org" >>>> *Subject: *Re: [Lsr] Flooding Topology Computation Algorithm - >>>> draft-cc-lsr-flooding-reduction-08 Working Group Adoption Call >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> On Thu, May 21, 2020 at 11:01 AM Huaimo Chen >>>> wrote: >>>> >>>> Hi Gyan, >>>> >>>> >>>> >>>> Thanks much for your questions. >>>> >>>> >>>> >>>> Gyan> How does this draft compare to the WG LC draft for flood >>>> reduction. Would they be two eventual standard options in the operato= rs >>>> toolbox or competing features for optimized flood reduction. Would ha= ving >>>> two flood reduction features standardized versus one default IGP flood >>>> reduction feature be confusing for operators. Just as it was confusin= g to >>>> me.. >>>> >>>> https://datatracker.ietf.org/doc/draft-ietf-lsr-dynamic-flooding/ >>>> >>>> >>>> >>>> >>>> [HC]: This draft plus the draft for flooding reduction can provide >>>> two modes of flooding reductions (i.e., centralized mode and distribut= ed >>>> mode). The latter describes the two modes, but does not include any >>>> flooding topology computation algorithm for the distributed mode. The >>>> former proposes a flooding topology computation algorithm to be used >>>> in the distributed mode. >>>> >>>> >>>> >>>> Gyan> It maybe a good idea for both documents to reference each >>>> other as to how they play together or in some respects if any provide= a >>>> homogeneous complete holistic solution for flooding problem being solv= ed. >>>> >>>> >>>> >>>> It is a good idea to have this new draft reference the dynamic-floodin= g >>>> but not vice-versa. The existing dynamic flooding draft provides a >>>> framework for any dynamic flooding algorithm that provides a separate >>>> flooding topology. This algorithm is just the first to be formally pro= posed >>>> in a draft. Note that another algorithm was presented during the LSR >>>> virtual interim which replaced IETF 107. >>>> >>>> >>>> >>>> In my opinion it may not be a bad idea even to combine both drafts so >>>> the solution is complete and holistic. This will also make the overal= l >>>> specification flow nicely. >>>> >>>> >>>> >>>> No =E2=80=93 we=E2=80=99re not going to do this. >>>> >>>> >>>> >>>> Thanks, >>>> >>>> Acee >>>> >>>> >>>> >>>> I know that efforts were made by LSR to have a common IGP solution, >>>> however there are many inherent differences between ISIS and OSPF that= from >>>> IGP Link state protocol perspective you can treat like apples to apple= s but >>>> really it=E2=80=99s apples and oranges. Maybe it might we wise to hav= e separate >>>> draft for both and have references linking together as the same algori= thm >>>> concept and mathematically however the actual code implementation woul= d >>>> vary as the LSDB link state data structures are completely different. >>>> >>>> >>>> >>>> Later =3D Dynamic flooding =3D 2 modes Centralized leader based and >>>> distributed >>>> >>>> >>>> >>>> https://datatracker.ietf.org/doc/draft-ietf-lsr-dynamic-flooding/ >>>> >>>> >>>> >>>> This later draft per section excerpt provides both centralized and >>>> distributed algorithm see below >>>> >>>> >>>> >>>> *6.4 . Area Leader Responsibilities* >>>> >>>> >>>> >>>> If the Area Leader operates in centralized mode, it MUST advertise >>>> >>>> algorithm 0 in its Area Leader Sub-TLV.. In order for Dynamic >>>> >>>> Flooding to be enabled it also MUST compute and advertise a floodin= g >>>> >>>> topology for the area. The Area Leader may update the flooding >>>> >>>> topology at any time, however, it should not destabilize the networ= k >>>> >>>> with undue or overly frequent topology changes. If the Area Leader >>>> >>>> operates in centralized mode and needs to advertise a new flooding >>>> >>>> topology, it floods the new flooding topology on both the new and o= ld >>>> >>>> flooding topologies. >>>> >>>> >>>> >>>> If the Area Leader operates in distributed mode, it MUST advertise = a >>>> >>>> non-zero algorithm in its Area Leader Sub-TLV. >>>> >>>> >>>> >>>> When the Area Leader advertises algorithm 0 in its Area Leader Sub- >>>> >>>> TLV and does not advertise a flooding topology, Dynamic Flooding is >>>> >>>> disabled for the area. Note this applies whether the Area Leader >>>> >>>> intends to operate in centralized mode or in distributed mode. >>>> >>>> >>>> >>>> Note that once Dynamic Flooding is enabled, disabling it risks >>>> >>>> destabilizing the network. >>>> >>>> >>>> >>>> *6.5 . Distributed Flooding Topology Calculation* >>>> >>>> >>>> >>>> If the Area Leader advertises a non-zero algorithm in its Area Lead= er >>>> >>>> Sub-TLV, all nodes in the area that support Dynamic Flooding and th= e >>>> >>>> value of algorithm advertised by the Area Leader MUST compute the >>>> >>>> flooding topology based on the Area Leader's advertised algorithm. >>>> >>>> >>>> >>>> Nodes that do not support the value of algorithm advertised by the >>>> >>>> Area Leader MUST continue to use standard flooding mechanism as >>>> >>>> defined by the protocol. >>>> >>>> >>>> >>>> Nodes that do not support the value of algorithm advertised by the >>>> >>>> Area Leader MUST be considered as Dynamic Flooding incapable nodes = by >>>> >>>> the Area Leader. >>>> >>>> >>>> >>>> If the value of the algorithm advertised by the Area Leader is from >>>> >>>> the range 128-254 (private distributed algorithms), it is the respo= nsibility of the >>>> >>>> network operator to guarantee that all nodes in the area have a common= understanding of what the given algorithm value represents. >>>> >>>> >>>> >>>> Former =3D WG LC >>>> >>>> https://datatracker.ietf.org/doc/html/draft-cc-lsr-flooding-reduction-= 08 >>>> >>>> >>>> >>>> Provides algorithm for distributed mode for this draft as well as the >>>> algorithm to be used for distributed mode later dynamic flooding draft >>>> >>>> >>>> >>>> Separate question- >>>> >>>> >>>> >>>> In light of the flooding algorithm and seeing that at the bottom of >>>> section 6.5 mentions flooding algorithm are the IANA codepoints reserv= ed >>>> for flooding unique and non overlapping with the flex algo codepoints = I >>>> believe 0-127. I would think the flooding algorithm range of values i= s >>>> completely separate since a different function then flex algo values. >>>> >>>> >>>> >>>> https://datatracker.ietf.org/doc/html/draft-ietf-lsr-flex-algo-07 >>>> >>>> >>>> >>>> >>>> >>>> Best Regards, >>>> >>>> Huaimo >>>> ------------------------------ >>>> >>>> *From:* Gyan Mishra >>>> *Sent:* Thursday, May 21, 2020 10:36 AM >>>> >>>> >>>> *To:* Huaimo Chen >>>> *Cc:* Acee Lindem (acee) ; >>>> lsr@ietf.org >>>> *Subject:* Re: [Lsr] Flooding Topology Computation Algorithm - >>>> draft-cc-lsr-flooding-reduction-08 Working Group Adoption Call >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> On Wed, May 20, 2020 at 11:59 PM Huaimo Chen >>>> wrote: >>>> >>>> Hi Gyan, >>>> >>>> >>>> >>>> Thanks much for your questions. My answers are inline below with >>>> [HC]. >>>> >>>> >>>> >>>> Best Regards, >>>> >>>> Huaimo >>>> ------------------------------ >>>> >>>> *From:* Gyan Mishra >>>> *Sent:* Wednesday, May 20, 2020 11:14 AM >>>> *To:* Huaimo Chen >>>> *Cc:* Acee Lindem (acee) ; >>>> lsr@ietf.org >>>> *Subject:* Re: [Lsr] Flooding Topology Computation Algorithm - >>>> draft-cc-lsr-flooding-reduction-08 Working Group Adoption Call >>>> >>>> >>>> >>>> Huaimo >>>> >>>> >>>> >>>> This is a much needed feature that operators have been needing for >>>> densely meshed topologies that commonly exist in data centers to >>>> accommodate very high bandwidth E-W traffic. >>>> >>>> [HC]: Thank you very much. >>>> >>>> >>>> >>>> Below is link from Cisco which has introduced feature for dynamic >>>> flooding in clos high density ECMP data center topologies. >>>> >>>> >>>> >>>> Please look at the feature description and it does seem to be exactly >>>> the same as this draft. Please confirm. >>>> >>>> [HC]: It seems different. >>>> >>>> >>>> >>>> There maybe other vendors due to industry demand have to get the >>>> feature deployed before it reaches standards vendor consensus with the= IETF. >>>> >>>> >>>> >>>> >>>> https://www.cisco.com/c/en/us/products/collateral/switches/nexus-9000-= series-switches/white-paper-c11-743015.html >>>> >>>> >>>> >>>> >>>> We are testing this feature and planning to deploy but wanted to ensur= e >>>> that this is the same as the draft on the standards track. >>>> >>>> [HC]: The feature appears implemented draft "Dynamic Flooding on Dense >>>> Graphs", which does not include any flooding topology computation >>>> algorithm.. >>>> >>>> >>>> >>>> Gyan> How does this draft compare to the WG LC draft for flood >>>> reduction. Would they be two eventual standard options in the operato= rs >>>> toolbox or competing features for optimized flood reduction. Would ha= ving >>>> two flood reduction features standardized versus one default IGP flood >>>> reduction feature be confusing for operators. Just as it was confusin= g to >>>> me. >>>> >>>> >>>> >>>> >>>> >>>> https://datatracker.ietf.org/doc/draft-ietf-lsr-dynamic-flooding/ >>>> >>>> >>>> >>>> >>>> Kind regards >>>> >>>> >>>> >>>> Gyan >>>> >>>> >>>> >>>> >>>> >>>> On Tue, May 19, 2020 at 11:52 PM Huaimo Chen >>>> wrote: >>>> >>>> Hi Gyan, >>>> >>>> >>>> >>>> Thank you very much for your questions and support. >>>> >>>> >>>> >>>> This Flooding Topology Computation algorithm can be used in the >>>> Dynamic Flooding on Dense Graphs to compute the flooding topologies fo= r >>>> the data center clos dense meshed topologies with many ECMP paths. It = can >>>> be used by the area leader in the centralized mode to compute the floo= ding >>>> topology. >>>> >>>> >>>> >>>> Best Regards, >>>> >>>> Huaimo >>>> ------------------------------ >>>> >>>> *From:* Lsr on behalf of Gyan Mishra < >>>> hayabusagsm@gmail.com> >>>> *Sent:* Tuesday, May 19, 2020 2:39 AM >>>> *To:* Yanhe Fan >>>> *Cc:* lsr@ietf.org ; Acee Lindem (acee) >>> 40cisco.com@dmarc.ietf.org> >>>> *Subject:* Re: [Lsr] Flooding Topology Computation Algorithm - >>>> draft-cc-lsr-flooding-reduction-08 Working Group Adoption Call >>>> >>>> >>>> >>>> >>>> >>>> I support WG adoption and have a few questions related to the draft. >>>> >>>> >>>> >>>> Does this flooding algorithm use the dynamic flooding algorithm used i= n >>>> data center clos dense meshed topologies with many ECMP paths where th= e >>>> flood is decoupled from the physical topology. In the dynamic floodin= g >>>> algorithm mentioned in centralized mode the flooding is computed by th= e >>>> area leader and distributed to all nodes. In distributed mode each mo= de >>>> the area leader determines the algorithm and then each node computes t= he >>>> flooding topology based on the algorithm. >>>> >>>> >>>> >>>> This dynamic algorithm for optimized flood reduction would reduce the >>>> amount of redundant flooding in highly densely meshed ospf or Isis >>>> topologies. So this optimization of flooding would improving overall = link >>>> state routing protocol convergence. >>>> >>>> >>>> >>>> Gyan >>>> >>>> >>>> >>>> On Mon, May 18, 2020 at 3:37 PM Yanhe Fan >>>> wrote: >>>> >>>> Support it as a co-author. >>>> >>>> >>>> >>>> Thanks, >>>> >>>> Yanhe >>>> >>>> >>>> >>>> *From:* Lsr *On Behalf Of *Acee Lindem (acee) >>>> *Sent:* Friday, May 15, 2020 3:40 PM >>>> *To:* lsr@ietf.org >>>> *Subject:* [Lsr] Flooding Topology Computation Algorithm - >>>> draft-cc-lsr-flooding-reduction-08 Working Group Adoption Call >>>> >>>> >>>> >>>> This begins a 3 week (due to holidays) WG adoption call for the >>>> =E2=80=9CFlooding Topology Computation Algorithm=E2=80=9D draft. Pleas= e issue your support >>>> or objection to this list by 11:59 PM, UTC on June 5th, 2020. Here is >>>> a URL for your convenience. >>>> >>>> >>>> >>>> https://datatracker.ietf.org/doc/draft-cc-lsr-flooding-reduction/ >>>> >>>> >>>> >>>> >>>> Thanks, >>>> Acee >>>> >>>> _______________________________________________ >>>> Lsr mailing list >>>> Lsr@ietf.org >>>> >>>> https://www..ietf.org/mailman/listinfo/lsr >>>> >>>> >>>> -- >>>> >>>> *Error! Filename not specified.* >>>> >>>> >>>> *Gyan >>>> Mishra* >>>> >>>> >>>> *Network >>>> Solutions Architect * >>>> >>>> >>>> >>>> *M 301 502-1347 13101 Columbia Pike >>>> >>>> >>>> *Silver Spring, MD >>>> >>>> >>>> >>>> >>>> >>>> >>>> -- >>>> >>>> *Error! Filename not specified.* >>>> >>>> >>>> *Gyan Mishra* >>>> >>>> *Network Solutions Architect * >>>> >>>> >>>> >>>> *M 301 502-1347 >>>> 13101 >>>> Columbia Pike >>>> >>>> >>>> *Silver Spring, MD >>>> >>>> >>>> >>>> >>>> >>>> >>>> -- >>>> >>>> *Error! Filename not specified.* >>>> >>>> >>>> *Gyan Mishra* >>>> >>>> *Network Solutions Architect * >>>> >>>> >>>> >>>> *M 301 502-1347 13101 Columbia Pike >>>> >>>> >>>> *Silver Spring, MD >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> -- >>>> >>>> *Error! Filename not specified.* >>>> >>>> *Gyan Mishra* >>>> >>>> *Network Solutions Architect * >>>> >>>> >>>> >>>> *M 301 502-1347 13101 Columbia Pike >>>> >>>> >>>> *Silver Spring, MD >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> -- >>>> >>>> [image: Image removed by sender.] >>>> >>>> *Gyan Mishra* >>>> >>>> *Network Solutions Architect * >>>> >>>> >>>> >>>> *M 301 502-1347 13101 Columbia Pike >>>> >>>> >>>> *Silver Spring, MD >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>> -- >>> >>> >>> >>> *Gyan Mishra* >>> >>> *Network Solutions A**rchitect * >>> >>> >>> >>> *M 301 502-134713101 Columbia Pike >>> *Silver >>> Spring, MD >>> >>> >>> -- >> >> >> >> *Gyan Mishra* >> >> *Network Solutions A**rchitect * >> >> >> >> *M 301 502-134713101 Columbia Pike >> *Silver >> Spring, MD >> >> >> _______________________________________________ >> Lsr mailing list >> Lsr@ietf.org >> https://www.ietf.org/mailman/listinfo/lsr >> > -- *Gyan Mishra* *Network Solutions A**rchitect * *M 301 502-134713101 Columbia Pike *Silver Spring, MD --0000000000008b54e005a63456b6 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable

Great Thanks Sarah!!

Gyan

On Thu, May 21, 2020 at 10:59 PM Sar= ah Chen <sarahchen@arista.com> wrote:

On Thu, May 21, 2020 at 7:32 PM Gyan Mishra <hayabusagsm@gmail.com&g= t; wrote:

I see the diagrams Appendix A - =C2=A0reviewing=C2=A0

Thanks=C2=A0
<= br>
Gyan

On Thu, May 21, 2020 at 10:1= 3 PM Gyan Mishra <hayabusagsm@gmail.com> wrote:

I think for both drafts it would be good to ha= ve a stick diagram at a minimum. =C2=A0

I majored in EE with math =C2=A0minor and both drafts are h= ard to follow without a diagram with labels showing the exact topology exam= ples. =C2=A0

Four main t= opologies - full mesh, partial mesh and leaf spine ( 2 tier) and CLOS ( 3 t= ier) - real world scenario=E2=80=99s.

From the interim meeting was their a slide deck visual topolo= gy shared?=C2=A0

That wo= uld help.

4.1=C2=A0

Step 1 - Build Cq candidate queue= =C2=A0

For each node B on FT whose D is one (from minimum to max=
imum
       node ID), find a link L attached to B such that L's remote node =
R
       has minimum D and ID, add link L between B and R into FT and
       increase B's D and R's D by one.  Return FT.
My interpretation is the algorithm an iterative loop and star= ts with any node in the candidate list so could start from edge and work le= ft to right or vice versa.=C2=A0 For loop to build FT from Cq =3D with each= node B with directly attached node R via link L.=C2=A0 Increment node B fr= om Cq until the FT is build for all nodes.=C2=A0 Instead of starting with a= wide diameter FT matching physical topology we start micro topology with D= =3D1 and go node by node.

4.2=C2=A0

1.  Finding and removing the first element with no=
de A in Cq that is
       not on FT and one PH's D in PHs < MaxD and PH's D < PH=
's ConMaxD.

       If A is root R0, then add the element into FT

       otherwise  (i.e., A !=3D R0 with one PH's D in PHs < MaxD and=
 PH's
          D < PH's ConMaxD.  Assume that PH is the first one in PHs
          whose D < MaxD and PH's D < PH's ConMaxD), PH's=
 D++, and add A
          with D =3D 1 and PHs =3D {PH} into FT.

       Note:  if there is no element with a node in Cq satisfying the
          conditions, then algorithm may be restarted from R0, ++MaxD,
          Cq =3D {(R0,D=3D0,PHs =3D { })}, FT =3D { };
This is similar to 4.1 with micro topology with 2 directly connec= ted nodes=C2=A0

My interpreta= tion of the algorithm from the verbiage.

<= div dir=3D"auto">So this draft starts in the middle of the topology and is = geared towards leaf spine 2 or 3 tier clos topology.

For this one we build the bi graph so that cou= ld be leaf connected to two spines or spine connected to two leafs and iter= atively build out the FT topology 3 node arch =C2=A0spine leaf spine or lea= f spine leaf.

Kind regar= ds=C2=A0

Gyan

<= div>
On Thu= , May 21, 2020 at 7:01 PM Acee Lindem (acee) <acee@cisco.com> wrote:
=

Hi Gyan,

=C2=A0

From: Gyan Mishra <hayabusagsm@gmail.com= >
Date: Thursday, May 21, 2020 at 4:20 PM
To: Acee Lindem <acee@cisco.com>
Cc: Huaimo Chen <huaimo.chen@futurewei.com>, "lsr@ietf.org" <lsr@ietf.org>
Subject: Re: [Lsr] Flooding Topology Computation Algorithm - draft-c= c-lsr-flooding-reduction-08 Working Group Adoption Call

=C2=A0

=C2=A0

Yes and I have started r= eviewing the LSR mail archives as I am late in the discussion for this.<= /u>

=C2=A0

If you have link to any = particular dates in the archives would be helpful.

=C2=A0

No =E2=80=93 it was more an =E2=80=9Cevolution=E2=80= =9D than an =E2=80=9Cepiphany=E2=80=9D.

=C2=A0

That sums up all the que= stions I have so if all answered in the archives then I am all set.<= u>

=C2=A0

I support the draft movi= ng forward as flood reduction is a much needed feature. =C2=A0

=C2=A0

I think overall both dra= fts will really help large data centers with any overlay underlay vxlan spi= ne leaf meshed CLOS highly meshed topology that scales out horizontally wit= h a large spine footprint - this is a much much needed feature.=C2=A0 This also helps eliminate complexity of th= e workaround of using BGP in the underlay which to me adds tremendous compl= exity.

=C2=A0

Here is the other recently presented dynamic floodin= g draft.

=C2=A0

https://datatracker.i= etf.org/doc/draft-chen-lsr-dynamic-flooding-algorithm/

=C2=A0

You can see they both make use of the dynamic floodi= ng infra in https://datatracker.ietf.org/doc/draft-ietf-lsr-dynami= c-flooding/

=C2=A0

Thanks,

Acee

=C2=A0

=C2=A0

=C2=A0

=C2=A0

Kind regards=C2=A0

=C2=A0

Gyan=C2=A0=

=C2=A0

On Thu, May 21, 2020 at = 4:07 PM Acee Lindem (acee) <acee@cisco.com> wrote:

=

Speaking as WG Co-chair:

=C2=A0

Hi Gyan,

=C2=A0

I guess you=E2=80=99ve joined this discussion late. It might be a good idea= to review the LSR mailing list archives.

=C2=A0

From: Gyan Mishra <hayabusagsm@gmail.com>
Date: Thursday, May 21, 2020 at 1:51 PM
To: Huaimo Chen <huaimo.chen@futurewei.com>
Cc: Acee Lindem <acee@cisco.com>, "lsr@ietf.org" <lsr@ietf.org>
Subject: Re: [Lsr] Flooding Topology Computation Algorithm - draft-c= c-lsr-flooding-reduction-08 Working Group Adoption Call

=C2=A0

=C2=A0

<= /blockquote>

=C2=A0

<= div class=3D"gmail_quote">

On Thu, May 21, 2020 at 11:01 AM Huaimo Chen <huaimo.chen@futurewei.com> wrot= e:

<= /div>

Hi Gyan,

=C2=A0

=C2=A0 =C2=A0 Thanks much for yo= ur questions.

=C2=A0

<= /div>
<= div class=3D"gmail_quote">

=C2=A0Gyan> How does this dra= ft compare to the WG LC draft for flood reduction.=C2=A0 Would they be two = eventual standard options in the operators toolbox =C2=A0or competing featu= res for optimized flood reduction. Would having two flood reduction features standardized versus one default IGP flood reducti= on feature be confusing for operators.=C2=A0 Just as it was confusing to me= ..=C2=A0

=C2=A0

=C2=A0 =C2=A0 [HC]: This draft p= lus the draft for flooding reduction can provide two modes of flooding redu= ctions (i.e., centralized mode and distributed mode). The latter describes = the two modes, but does not include any flooding topology computation algorithm for the distributed mode. The former propos= es a=C2=A0flooding topology computat= ion algorithm to be used in the distributed mode.=C2=A0=C2=A0=

=C2=A0

=C2=A0 =C2=A0Gyan> It maybe a good idea for both documents to reference = each other as to how they play together or =C2=A0in some respects if any pr= ovide a homogeneous complete holistic solution for flooding problem being s= olved. =C2=A0

=C2=A0

It is a good idea to have this new draft reference the dynamic-flooding but= not vice-versa. The existing dynamic flooding draft provides a framework f= or any dynamic flooding algorithm that provides a separate flooding topolog= y. This algorithm is just the first to be formally proposed in a draft. Note that another algorithm was presen= ted during the LSR virtual interim which replaced IETF 107. =C2=A0

=C2=A0

In my opinion it may not be a bad idea even to combine both drafts so the s= olution is complete and holistic.=C2=A0 This will also make the overall spe= cification flow nicely. =C2=A0

=C2=A0

No =E2=80=93 we=E2=80=99re not going to do this.

=C2=A0

Thanks,

Acee

=C2=A0

I know that efforts were made by LSR to have a common IGP solution, however= there are many inherent differences between ISIS and OSPF that from IGP Li= nk state protocol perspective you can treat like apples to apples but reall= y it=E2=80=99s apples and oranges.=C2=A0 Maybe it might we wise to have separate draft for both and have references linki= ng together as the same algorithm concept and mathematically however the ac= tual code implementation would vary as the LSDB link state data structures = are completely different.=C2=A0

=C2=A0

Later =3D Dynamic flooding =3D 2 modes Centralized leader based and distrib= uted=C2=A0

=C2=A0

This later draft per section excerpt provides both centralized and distribu= ted algorithm see below=C2=A0

=C2=A0

6.4.=C2=A0 Area Leader Responsibilities
=C2=A0
=C2=A0=C2=A0 If the Area Leader operates in central=
ized mode, it MUST advertise<=
u style=3D"font-family:monospace">
=C2=A0=C2=A0 algorithm 0 in its Area Leader Sub-TLV=
..=C2=A0 In order for Dynamic=
=
= 
=C2=A0=C2=A0 Flooding to be enabled it also MUST co=
mpute and advertise a flooding
=C2=A0=C2=A0 topology for the area.=C2=A0 The Area =
Leader may update the flooding
=C2=A0=C2=A0 topology at any time, however, it shou=
ld not destabilize the network
=C2=A0=C2=A0 with undue or overly frequent topology=
 changes.=C2=A0 If the Area Leader
=C2=A0=C2=A0 operates in centralized mode and needs=
 to advertise a new flooding<=
u style=3D"font-family:monospace">
=C2=A0=C2=A0 topology, it floods the new flooding t=
opology on both the new and old
=C2=A0=C2=A0 flooding topologies.
=C2=A0
=C2=A0=C2=A0 If the Area Leader operates in distrib=
uted mode, it MUST advertise a
=C2=A0=C2=A0 non-zero algorithm in its Area Leader =
Sub-TLV.
=C2=A0
=C2=A0=C2=A0 When the Area Leader advertises algori=
thm 0 in its Area Leader Sub-=

=C2=A0=C2=A0 TLV and does not advertise a flooding =
topology, Dynamic Flooding is=

=C2=A0=C2=A0 disabled for the area.=C2=A0 Note this=
 applies whether the Area Leader<=
/u>
=C2=A0=C2=A0 intends to operate in centralized mode=
 or in distributed mode.
=C2=A0
=C2=A0=C2=A0 Note that once Dynamic Flooding is ena=
bled, disabling it risks
=C2=A0=C2=A0 destabilizing the network.

=C2=A0


6.5.=C2=A0 Distributed Flooding Topology Calculation<=
u style=3D"font-family:monospace">


=C2=A0


=C2=A0=C2=A0 If the Area Leader advertises a non-ze=
ro algorithm in its Area Leader


=C2=A0=C2=A0 Sub-TLV, all nodes in the area that su=
pport Dynamic Flooding and the


=C2=A0=C2=A0 value of algorithm advertised by the A=
rea Leader MUST compute the


=C2=A0=C2=A0 flooding topology based on the Area Le=
ader's advertised algorithm.<=
/u>


=C2=A0


=C2=A0=C2=A0 Nodes that do not support the value of=
 algorithm advertised by the<=
u style=3D"font-family:monospace">


=C2=A0=C2=A0 Area Leader MUST continue to use stand=
ard flooding mechanism as


=C2=A0=C2=A0 defined by the protocol.

=C2=A0


=C2=A0=C2=A0 Nodes that do not support the value of=
 algorithm advertised by the<=
u style=3D"font-family:monospace">


=C2=A0=C2=A0 Area Leader MUST be considered as Dyna=
mic Flooding incapable nodes by


=C2=A0=C2=A0 the Area Leader.


=C2=A0


=C2=A0=C2=A0 If the value of the algorithm advertis=
ed by the Area Leader is from=



=C2=A0=C2=A0 the range 128-254 (private distributed=
 algorithms), it is the responsibility of the=C2=A0


network operator to guarantee that all nodes in the area have a common u=
nderstanding of what the given algorithm value represents.

=C2=A0
=
<= div>

Former =3D WG LC=C2=A0

Provides algorithm for distributed mode for this draft as well as the algor= ithm to be used for distributed mode later dynamic flooding draft=C2=A0<= /u>

=C2=A0

Separate question-

=C2=A0

In light of the flooding algorithm and seeing that at the bottom of section= 6.5 mentions flooding algorithm are the IANA codepoints reserved for flood= ing unique and non overlapping with the flex algo codepoints I believe 0-12= 7.=C2=A0 I would think the flooding algorithm range of values is completely separate since a different function then fle= x algo values.

=C2=A0

<= /div>

=C2=A0

Best Regards,

Huaimo

From:= Gyan Mishra <hayabusagsm@gmail.com>
Sent: Thursday, May 21, 2020 10:36 AM


To: Huaimo Chen <huaimo.chen@futurewei.com>
Cc: Acee Lindem (acee) <acee=3D40cisco.com@dmarc.ietf.org>; lsr@ietf.org <lsr@ietf.org>
Subject: Re: [Lsr] Flooding Topology Computation Algorithm - draft-c= c-lsr-flooding-reduction-08 Working Group Adoption Call

=C2=A0

=C2=A0

=C2=A0

On Wed, May 20, 2020 at 11:59 PM Huaimo Chen <huaimo.chen@futurewei.com> wrot= e:

Hi Gyan,

=C2=A0

=C2=A0 =C2=A0 Thanks much for yo= ur questions. My answers are inline below with [HC].

=C2=A0

Best Regards,

Huaimo

From:= Gyan Mishra <hayabusagsm@gmail.com>
Sent: Wednesday, May 20, 2020 11:14 AM
To: Huaimo Chen <huaimo.chen@futurewei.com>
Cc: Acee Lindem (acee) <acee=3D40cisco.com@dmarc.ietf.org>; lsr@ietf.org <lsr@ietf.org>
Subject: Re: [Lsr] Flooding Topology Computation Algorithm - draft-c= c-lsr-flooding-reduction-08 Working Group Adoption Call

=C2=A0

Huaimo=C2=A0

=C2=A0

This is a much needed feature that operators have been needing for densely = meshed topologies that commonly exist in data centers to accommodate very h= igh bandwidth E-W traffic.

[HC]: Thank you very much.

=C2=A0

Below is link from Cisco which has introduced feature for dynamic flooding = in clos high density ECMP data center topologies.

=C2=A0

Please look at the feature description and it does seem to be exactly the s= ame as this draft.=C2=A0 Please confirm.=C2=A0

[HC]: It seems different.=C2=A0

=C2=A0

There maybe other vendors due to industry demand have to get the feature de= ployed before it reaches standards vendor consensus with the IETF.

=C2=A0

=C2=A0

We are testing this feature and planning to deploy but wanted to ensure tha= t this is the same as the draft on the standards track.

[HC]: The feature appear= s implemented draft "Dynamic Flooding on Dense Graphs", which doe= s not include any flooding topology computation algorithm..=C2=A0=

=C2=A0

=C2=A0 =C2=A0 Gyan> How does this draft compare to the WG LC draft for f= lood reduction.=C2=A0 Would they be two eventual standard options in the op= erators toolbox =C2=A0or competing features for optimized flood reduction. = Would having two flood reduction features standardized versus one default IGP flood reduction feature be confusing for operators.= =C2=A0 Just as it was confusing to me.

=C2=A0

=C2=A0

Kind regards=C2=A0

=C2=A0

Gyan

=C2=A0

=C2=A0

On Tue, May 19, 2020 at 11:52 PM Huaimo Chen <huaimo.chen@futurewei.com> wrot= e:

Hi = Gyan,

=C2=A0

=C2= =A0 =C2=A0 Thank you very much for your questions and support.

=C2=A0

=C2= =A0 =C2=A0 This Flooding Topology Comput= ation algorithm can be used in the Dynamic Flooding on Dense Graphs to compute the flooding topologies for the=C2=A0data cente= r clos dense meshed topologies with many ECMP paths. It can be used by the = area leader in the centralized mode to compute the flooding topology. =C2= =A0=C2=A0

=C2=A0

Bes= t Regards,

Hua= imo

From:= Lsr <lsr-boun= ces@ietf.org> on behalf of Gyan Mishra <hayabusagsm@gmail.com>
Sent: Tuesday, May 19, 2020 2:39 AM
To: Yanhe Fan <yfan@casa-systems.com>
Cc: lsr@ietf.org <lsr@ietf.org&g= t;; Acee Lindem (acee) <acee=3D40cisco.com@dmarc.ietf.org>
Subject: Re: [Lsr] Flooding Topology Computation Algorithm - draft-c= c-lsr-flooding-reduction-08 Working Group Adoption Call

=C2=A0

=

=C2=A0

I support WG adoption and have a few questions related to the draft.=

=C2=A0

Does this flooding algorithm use the dynamic flooding algorithm used in dat= a center clos dense meshed topologies with many ECMP paths where the flood = is decoupled from the physical topology.=C2=A0 In the dynamic flooding algo= rithm mentioned in centralized mode the flooding is computed by the area leader and distributed to all nodes.=C2= =A0 In distributed mode each mode the area leader determines the algorithm = and then each node computes the flooding topology based on the algorithm. = =C2=A0

=C2=A0

This dynamic algorithm for optimized flood reduction would reduce the amoun= t of redundant flooding in highly densely meshed ospf or Isis topologies.= =C2=A0 So this optimization of flooding would improving overall link state = routing protocol convergence.

=C2=A0

Gyan=C2=A0

=C2=A0

<= /div>
=
<= div>

On Mon, May 18, 2020 at 3:37 PM Yanhe Fan <yfan@casa-systems.com> wrote:

<= div>
=
<= /div>
=
=

=

_______________________________________________
Lsr mailing list
Lsr@ietf.org

--

Error! Filename not specified.

Gyan Mishra

Network Soluti= ons Architect=C2=A0

M 301 502-1347
13101 Columbia Pike=C2=A0
Silver Spring, MD

=C2=A0

--

Error! Filename not specified.

Gyan Mishra

Network Solutions = Architect=C2=A0

M 301 502-1347
= 13101 Columbia Pike=C2=A0
Silver Spring, MD

=C2=A0

--

<= /div>
<= div>

Gyan Mishra

Network Solutions = Architect=C2=A0

M 301 502-1347
13101 Columbia Pike=C2=A0
Silver Spring, MD

<= a href=3D"https://www.google.com/maps/search/13101+Columbia+Pike+%0D%0A+Sil= ver+Spring,+MD?entry=3Dgmail&source=3Dg" target=3D"_blank">

=C2=A0

--

Gyan Mishra

Network Solutions = Architect=C2=A0

M 301 502-1347
13101 Columbia Pike=C2=A0
Silver Spring, MD

<= a href=3D"https://www.google.com/maps/search/13101+Columbia+Pike+%0D%0A+Sil= ver+Spring,+MD?entry=3Dgmail&source=3Dg" target=3D"_blank">

=C2=A0

--

3D"Image=

Gyan Mishra

Network Solutions = Architect=C2=A0

M 301 502-1347
13101 Columbia Pike=C2=A0
Silver Spring, MD

<= a href=3D"https://www.google.com/maps/search/13101+Columbia+Pike+%0D%0A+Sil= ver+Spring,+MD?entry=3Dgmail&source=3Dg" target=3D"_blank">

=C2=A0

--


Gyan Mishra

= Network Solutions Architect=C2=A0

M 301 502-1347<= br>13101 Columbia Pike= =C2=A0
Silver Spring, MD


--


Gyan Mishra

= Network Solutions Architect=C2=A0

M 301 502-1347<= br>13101 Columbia Pike= =C2=A0
Silver Spring, MD


_______________________________________________
Lsr mailing list
Lsr@ietf.org
https://www.ietf.org/mailman/listinfo/lsr
--
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charset="Windows-1252" Content-Transfer-Encoding: quoted-printable Hi Gyan, Thanks much for your suggestion. Gyan> It maybe a good idea for both documents to reference each other a= s to how they play together or in some respects if any provide a homogeneo= us complete holistic solution for flooding problem being solved. [HC]: I will add the reference in the draft. Best Regards, Huaimo ________________________________ From: Gyan Mishra Sent: Thursday, May 21, 2020 1:51 PM To: Huaimo Chen Cc: Acee Lindem (acee) ; lsr@ietf.org Subject: Re: [Lsr] Flooding Topology Computation Algorithm - draft-cc-lsr-f= looding-reduction-08 Working Group Adoption Call On Thu, May 21, 2020 at 11:01 AM Huaimo Chen > wrote: Hi Gyan, Thanks much for your questions. Gyan> How does this draft compare to the WG LC draft for flood reduction. = Would they be two eventual standard options in the operators toolbox or c= ompeting features for optimized flood reduction. Would having two flood red= uction features standardized versus one default IGP flood reduction feature= be confusing for operators. Just as it was confusing to me. https://datatracker.ietf.org/doc/draft-ietf-lsr-dynamic-flooding/ [HC]: This draft plus the draft for flooding reduction can provide two = modes of flooding reductions (i.e., centralized mode and distributed mode).= The latter describes the two modes, but does not include any flooding topo= logy computation algorithm for the distributed mode. The former proposes a = flooding topology computation algorithm to be used in the distributed mode. Gyan> It maybe a good idea for both documents to reference each other as= to how they play together or in some respects if any provide a homogeneou= s complete holistic solution for flooding problem being solved. In my opinion it may not be a bad idea even to combine both drafts so the s= olution is complete and holistic. This will also make the overall specific= ation flow nicely. I know that efforts were made by LSR to have a common IGP solution, however= there are many inherent differences between ISIS and OSPF that from IGP Li= nk state protocol perspective you can treat like apples to apples but reall= y it=92s apples and oranges. Maybe it might we wise to have separate draft= for both and have references linking together as the same algorithm concep= t and mathematically however the actual code implementation would vary as t= he LSDB link state data structures are completely different. Later =3D Dynamic flooding =3D 2 modes Centralized leader based and distrib= uted https://datatracker.ietf.org/doc/draft-ietf-lsr-dynamic-flooding/ This later draft per section excerpt provides both centralized and distribu= ted algorithm see below 6.4. Are= a Leader Responsibilities If the Area Leader operates in centralized mode, it MUST advertise algorithm 0 in its Area Leader Sub-TLV. In order for Dynamic Flooding to be enabled it also MUST compute and advertise a flooding topology for the area. The Area Leader may update the flooding topology at any time, however, it should not destabilize the network with undue or overly frequent topology changes. If the Area Leader operates in centralized mode and needs to advertise a new flooding topology, it floods the new flooding topology on both the new and old flooding topologies. If the Area Leader operates in distributed mode, it MUST advertise a non-zero algorithm in its Area Leader Sub-TLV. When the Area Leader advertises algorithm 0 in its Area Leader Sub- TLV and does not advertise a flooding topology, Dynamic Flooding is disabled for the area. Note this applies whether the Area Leader intends to operate in centralized mode or in distributed mode. Note that once Dynamic Flooding is enabled, disabling it risks destabilizing the network. 6.5. D= istributed Flooding Topology Calculation If the Area Leader advertises a non-zero algorithm in its Area Leader Sub-TLV, all nodes in the area that support Dynamic Flooding and the value of algorithm advertised by the Area Leader MUST compute the flooding topology based on the Area Leader's advertised algorithm. Nodes that do not support the value of algorithm advertised by the Area Leader MUST continue to use standard flooding mechanism as defined by the protocol. Nodes that do not support the value of algorithm advertised by the Area Leader MUST be considered as Dynamic Flooding incapable nodes by the Area Leader. If the value of the algorithm advertised by the Area Leader is from the range 128-254 (private distributed algorithms), it is the responsibi= lity of the network operator to guarantee that all nodes in the area have a common unde= rstanding of what the given algorithm value represents. Former =3D WG LC https://datatracker.ietf.org/doc/html/draft-cc-lsr-flooding-reduction-08 Provides algorithm for distributed mode for this draft as well as the algor= ithm to be used for distributed mode later dynamic flooding draft Separate question- In light of the flooding algorithm and seeing that at the bottom of section= 6.5 mentions flooding algorithm are the IANA codepoints reserved for flood= ing unique and non overlapping with the flex algo codepoints I believe 0-12= 7. I would think the flooding algorithm range of values is completely sepa= rate since a different function then flex algo values. https://datatracker.ietf.org/doc/html/draft-ietf-lsr-flex-algo-07 Best Regards, Huaimo ________________________________ From: Gyan Mishra > Sent: Thursday, May 21, 2020 10:36 AM To: Huaimo Chen > Cc: Acee Lindem (acee) >; lsr@ietf.org > Subject: Re: [Lsr] Flooding Topology Computation Algorithm - draft-cc-lsr-f= looding-reduction-08 Working Group Adoption Call On Wed, May 20, 2020 at 11:59 PM Huaimo Chen > wrote: Hi Gyan, Thanks much for your questions. My answers are inline below with [HC]. Best Regards, Huaimo ________________________________ From: Gyan Mishra > Sent: Wednesday, May 20, 2020 11:14 AM To: Huaimo Chen > Cc: Acee Lindem (acee) >; lsr@ietf.org > Subject: Re: [Lsr] Flooding Topology Computation Algorithm - draft-cc-lsr-f= looding-reduction-08 Working Group Adoption Call Huaimo This is a much needed feature that operators have been needing for densely = meshed topologies that commonly exist in data centers to accommodate very h= igh bandwidth E-W traffic. [HC]: Thank you very much. Below is link from Cisco which has introduced feature for dynamic flooding = in clos high density ECMP data center topologies. Please look at the feature description and it does seem to be exactly the s= ame as this draft. Please confirm. [HC]: It seems different. There maybe other vendors due to industry demand have to get the feature de= ployed before it reaches standards vendor consensus with the IETF. https://www.cisco.com/c/en/us/products/collateral/switches/nexus-9000-serie= s-switches/white-paper-c11-743015.html We are testing this feature and planning to deploy but wanted to ensure tha= t this is the same as the draft on the standards track. [HC]: The feature appears implemented draft "Dynamic Flooding on Dense Grap= hs", which does not include any flooding topology computation algorithm. Gyan> How does this draft compare to the WG LC draft for flood reductio= n. Would they be two eventual standard options in the operators toolbox o= r competing features for optimized flood reduction. Would having two flood = reduction features standardized versus one default IGP flood reduction feat= ure be confusing for operators. Just as it was confusing to me. https://datatracker.ietf.org/doc/draft-ietf-lsr-dynamic-flooding/ Kind regards Gyan On Tue, May 19, 2020 at 11:52 PM Huaimo Chen > wrote: Hi Gyan, Thank you very much for your questions and support. This Flooding Topology Computation algorithm can be used in the Dynamic= Flooding on Dense Graphs to compute the flooding topologies for the data c= enter clos dense meshed topologies with many ECMP paths. It can be used by = the area leader in the centralized mode to compute the flooding topology. Best Regards, Huaimo ________________________________ From: Lsr > on behalf of = Gyan Mishra > Sent: Tuesday, May 19, 2020 2:39 AM To: Yanhe Fan > Cc: lsr@ietf.org >; = Acee Lindem (acee) > Subject: Re: [Lsr] Flooding Topology Computation Algorithm - draft-cc-lsr-f= looding-reduction-08 Working Group Adoption Call I support WG adoption and have a few questions related to the draft. Does this flooding algorithm use the dynamic flooding algorithm used in dat= a center clos dense meshed topologies with many ECMP paths where the flood = is decoupled from the physical topology. In the dynamic flooding algorithm= mentioned in centralized mode the flooding is computed by the area leader = and distributed to all nodes. In distributed mode each mode the area leade= r determines the algorithm and then each node computes the flooding topolog= y based on the algorithm. This dynamic algorithm for optimized flood reduction would reduce the amoun= t of redundant flooding in highly densely meshed ospf or Isis topologies. = So this optimization of flooding would improving overall link state routing= protocol convergence. Gyan On Mon, May 18, 2020 at 3:37 PM Yanhe Fan > wrote: Support it as a co-author. Thanks, Yanhe From: Lsr > On Behalf Of = Acee Lindem (acee) Sent: Friday, May 15, 2020 3:40 PM To: lsr@ietf.org Subject: [Lsr] Flooding Topology Computation Algorithm - draft-cc-lsr-flood= ing-reduction-08 Working Group Adoption Call This begins a 3 week (due to holidays) WG adoption call for the =93Flooding= Topology Computation Algorithm=94 draft. Please issue your support or obje= ction to this list by 11:59 PM, UTC on June 5th, 2020. Here is a URL for yo= ur convenience. https://datatracker.ietf.org/doc/draft-cc-lsr-flooding-reduction/ Thanks, Acee _______________________________________________ Lsr mailing list Lsr@ietf.org https://www.ietf.org/mailman/listinfo/lsr -- [http://ss7.vzw.com/is/image/VerizonWireless/vz-logo-email] Gyan Mishra Network Solutions Architect M 301 502-1347 13101 Columbia Pike Silver Spring, MD -- [http://ss7.vzw.com/is/image/VerizonWireless/vz-logo-email] Gyan Mishra Network Solutions Architect M 301 502-1347 13101 Columbia Pike Silver Spring, MD -- [http://ss7.vzw.com/is/image/VerizonWireless/vz-logo-email] Gyan Mishra Network Solutions Architect M 301 502-1347 13101 Columbia Pike Silver Spring, MD -- [http://ss7.vzw.com/is/image/VerizonWireless/vz-logo-email] Gyan Mishra Network Solutions Architect M 301 502-1347 13101 Columbia Pike Silver Spring, MD --_000_MN2PR13MB31175080DCB1F7FBC8658965F2B40MN2PR13MB3117namp_ Content-Type: text/html; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable
Hi Gyan,

    Thanks much for your suggestion.
   
    Gyan> It maybe a good idea for both documents to reference= each other as to how they play together or  in some respects if any p= rovide a homogeneous complete holistic solution for flooding problem being = solved.

[HC]: I will add the reference in the draft.

Best Regards,
Huaimo
From: Gyan Mishra <hayab= usagsm@gmail.com>
Sent: Thursday, May 21, 2020 1:51 PM
To: Huaimo Chen <huaimo.chen@futurewei.com>
Cc: Acee Lindem (acee) <acee=3D40cisco.com@dmarc.ietf.org>; ls= r@ietf.org <lsr@ietf.org>
Subject: Re: [Lsr] Flooding Topology Computation Algorithm - draft-c= c-lsr-flooding-reduction-08 Working Group Adoption Call
 


On Thu, May 21, 2020 at 11:01 AM Hu= aimo Chen <huaimo.chen@futu= rewei.com> wrote:
Hi Gyan,

    Thanks much for your questions.

 Gyan> How does this draft compare to the WG LC draft for flood reductio= n.  Would they be two eventual standard options in the operators toolb= ox  or competing features for optimized flood reduction. Would having two flood reduction features standardized versus one default = IGP flood reduction feature be confusing for operators.  Just as it wa= s confusing to me. 
<= a href=3D"https://nam11.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F= %2Fdatatracker.ietf.org%2Fdoc%2Fdraft-ietf-lsr-dynamic-flooding%2F&data= =3D02%7C01%7Chuaimo.chen%40futurewei.com%7Ce0f4766963da47bb3ba608d7fdaf9134= %7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C0%7C637256802824693892&sdata= =3D4vWmUdR%2BbXWXgjyBAw62Ig%2BxUyKPuq6uucKbrfbNv5w%3D&reserved=3D0" ori= ginalsrc=3D"https://datatracker.ietf.org/doc/draft-ietf-lsr-dynamic-floodin= g/" shash=3D"gu0qb1U6YjvZmBmlIawrs0W95Y3mqI0HqxjKhpXZjj0E7ysqNJyPXoviTYLhJG= 2YZwQV/HUpQhFLf28x6vOjLpoXDcq63+awlFEysrPcN95rGzLeTKD37JxPz9GJE1ftXc4F5= 3re12Kq6RMtKj0nvoNDhyOTD2jj0V835WaqoM4=3D" target=3D"_blank" style=3D"margi= n:0px; font-family:Calibri,Arial,Helvetica,sans-serif">https://datatracker.= ietf.org/doc/draft-ietf-lsr-dynamic-flooding/

    [HC]: This draft plus the draft for flooding reduction can pr= ovide two modes of flooding reductions (i.e., centralized mode and distribu= ted mode). The latter describes the two modes, but does not include any flo= oding topology computation algorithm for the distributed mode. The former proposes a flooding topology computation algorithm to be used in t= he distributed mode.  

   Gyan> It maybe a good idea for both docum= ents to reference each other as to how they play together or  in some = respects if any provide a homogeneous complete holistic solution for floodi= ng problem being solved.  

In my opinion it may not be a bad idea even to combine bo= th drafts so the solution is complete and holistic.  This will also ma= ke the overall specification flow nicely.  

I know that efforts were made by LSR to have a common IGP= solution, however there are many inherent differences between ISIS and OSP= F that from IGP Link state protocol perspective you can treat like apples t= o apples but really it=92s apples and oranges.  Maybe it might we wise to have separate draft for both and = have references linking together as the same algorithm concept and mathemat= ically however the actual code implementation would vary as the LSDB link s= tate data structures are completely different. 

Later =3D Dynamic flooding =3D 2 modes Centralized leader= based and distributed 

This later draft per section excerpt provides both centra= lized and distributed algorithm see below 

6.4.  Area Leader Responsibilities=0A=
=0A=
   If the Area Leader operates in centralized mode, it MUST advertise=0A=
   algorithm 0 in its Area Leader Sub-TLV.  In order for Dynamic=0A=
   Flooding to be enabled it also MUST compute and advertise a flooding=0A=
   topology for the area.  The Area Leader may update the flooding=0A=
   topology at any time, however, it should not destabilize the network=0A=
   with undue or overly frequent topology changes.  If the Area Leader=0A=
   operates in centralized mode and needs to advertise a new flooding=0A=
   topology, it floods the new flooding topology on both the new and old=0A=
   flooding topologies.=0A=
=0A=
   If the Area Leader operates in distributed mode, it MUST advertise a=0A=
   non-zero algorithm in its Area Leader Sub-TLV.=0A=
=0A=
   When the Area Leader advertises algorithm 0 in its Area Leader Sub-=0A=
   TLV and does not advertise a flooding topology, Dynamic Flooding is=0A=
   disabled for the area.  Note this applies whether the Area Leader=0A=
   intends to operate in centralized mode or in distributed mode.=0A=
=0A=
   Note that once Dynamic Flooding is enabled, disabling it risks=0A=
   destabilizing the network.=0A=
=0A=
6.5.  Di=
stributed Flooding Topology Calculation=0A=
=0A=
   If the Area Leader advertises a non-zero algorithm in its Area Leader=0A=
   Sub-TLV, all nodes in the area that support Dynamic Flooding and the=0A=
   value of algorithm advertised by the Area Leader MUST compute the=0A=
   flooding topology based on the Area Leader's advertised algorithm.=0A=
=0A=
   Nodes that do not support the value of algorithm advertised by the=0A=
   Area Leader MUST continue to use standard flooding mechanism as=0A=
   defined by the protocol.=0A=
=0A=
   Nodes that do not support the value of algorithm advertised by the=0A=
   Area Leader MUST be considered as Dynamic Flooding incapable nodes by=0A=
   the Area Leader.=0A=
=0A=
   If the value of the algorithm advertised by the Area Leader is from=0A=
   the range 128-254 (private distributed algorithms), it is the re=
sponsibility of the 
network operator to guarante=
e that all nodes in the area have a common understanding of =
what the given algorithm value represents.

Former =3D WG LC 
Provides algorithm for distributed mode for this draft as= well as the algorithm to be used for distributed mode later dynamic floodi= ng draft 

Separate question-

In light of the flooding algorithm and seeing that at the= bottom of section 6.5 mentions flooding algorithm are the IANA codepoints = reserved for flooding unique and non overlapping with the flex algo codepoi= nts I believe 0-127.  I would think the flooding algorithm range of values is completely separate since a diff= erent function then flex algo values.


Best Regards,
Huaimo
From:= Gyan Mishra <hayabusagsm@gmail.com>
Sent: Thursday, May 21, 202= 0 10:36 AM

To: Huaimo Chen <huaimo.chen@futurewei.com>
Cc: Acee Lindem (acee) <= acee=3D40cisco.com@dmarc.ietf.org>; lsr@ietf.org <lsr@ietf.org>
Subject: Re: [Lsr] Flooding= Topology Computation Algorithm - draft-cc-lsr-flooding-reduction-08 Workin= g Group Adoption Call
 


On Wed, May 20, 2020 at 11:59 PM Huaimo Chen <huaimo.chen@futurew= ei.com> wrote:
Hi Gyan,

    Thanks much for your questions. My answers are inline below w= ith [HC].

Best Regards,
Huaimo
From: Gyan Mishra <hayabusagsm@gmail.co= m>
Sent: Wednesday, May 20, 20= 20 11:14 AM
To: Huaimo Chen <huaimo.chen@futurewei.com>
Cc: Acee Lindem (acee) <= acee=3D40cisco.com@dmarc.ietf.org>; lsr@ietf.org <lsr@ietf.org>
Subject: Re: [Lsr] Flooding= Topology Computation Algorithm - draft-cc-lsr-flooding-reduction-08 Workin= g Group Adoption Call
 
Huaimo 

This is a much needed feature that operators have been ne= eding for densely meshed topologies that commonly exist in data centers to = accommodate very high bandwidth E-W traffic.
[HC]: Thank you very much.

Below is link from Cisco which has introduced feature for= dynamic flooding in clos high density ECMP data center topologies.

Please look at the feature description and it does seem t= o be exactly the same as this draft.  Please confirm. 
[HC]: It seems different. 

There maybe other vendors due to industry demand have to = get the feature deployed before it reaches standards vendor consensus with = the IETF.


We are testing this feature and planning to deploy but wa= nted to ensure that this is the same as the draft on the standards track.
[HC]: The feature appears implemented draft "Dynamic Flooding on Dense Graph= s", which does not include any flooding topology computation algorithm= . 

    Gyan> How does this draft compare to the= WG LC draft for flood reduction.  Would they be two eventual standard= options in the operators toolbox  or competing features for optimized= flood reduction. Would having two flood reduction features standardized versus one default IGP flood reduction feature be confusing f= or operators.  Just as it was confusing to me.


Kind regards 

Gyan


On Tue, May 19, 2020 at 11:52 PM Huaimo Chen <huaimo.chen@futurew= ei.com> wrote:
Hi G= yan,

&nbs= p;   Thank you very much for your questions and support.

&nbs= p;   This Flooding Topology Computation algorithm can be used in the Dynamic Flooding on Dense Graphs to compute the flooding topologies for the d= ata center clos dense meshed topologies with many ECMP paths. It can be use= d by the area leader in the centralized mode to compute the flooding topolo= gy.   

Best= Regards,
Huai= mo
From: Lsr <lsr-bounces@ietf.org> on behalf of Gyan Mishra <hayabusagsm@gmail.co= m>
Sent: Tuesday, May 19, 2020= 2:39 AM
To: Yanhe Fan <yfan@casa-systems.com>
Cc: lsr@ietf.org <lsr@ietf.org>; Acee Lindem (ace= e) <acee=3D40cisco.com@dmarc.ietf.org&= gt;
Subject: Re: [Lsr] Flooding= Topology Computation Algorithm - draft-cc-lsr-flooding-reduction-08 Workin= g Group Adoption Call
 

I support WG adoption and have a few questions related to= the draft.

Does this flooding algorithm use the dynamic flooding alg= orithm used in data center clos dense meshed topologies with many ECMP path= s where the flood is decoupled from the physical topology.  In the dyn= amic flooding algorithm mentioned in centralized mode the flooding is computed by the area leader and distributed to all no= des.  In distributed mode each mode the area leader determines the alg= orithm and then each node computes the flooding topology based on the algor= ithm.  

This dynamic algorithm for optimized flood reduction woul= d reduce the amount of redundant flooding in highly densely meshed ospf or = Isis topologies.  So this optimization of flooding would improving ove= rall link state routing protocol convergence.

Gyan 

On Mon, May 18, 2020 at 3:37 PM Yanhe Fan <yfan@casa-systems.com>= ; wrote:

Support it as a co-author.<= /span>

 

Thanks,

Yanhe

_______________________________________________
Lsr mailing list
Lsr@ietf.org
https://www.ietf.org/mailman/listinfo/lsr=
--


Gyan Mishra

Network Solutions Architect 

M 301 502-1347
13101 Columbia Pike 
Silver Spring, MD


--


Gyan M= ishra

Network Solutions Architect 

M 301 502-1347
13101 Columbia Pike 
Silver Spring, MD


--


Gyan M= ishra

Network Solutions Architect 

M 301 502-1347
13101 Columbia Pike 
Silver Spring, MD


--

Gyan Mishra

Network Solutio= ns Architect&= nbsp;

M 301 502-1347
13101 Columbia Pike 
Silver Spring, MD


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boundary="_000_MN2PR13MB31179DB87C96DA218F9EB1D0F2B40MN2PR13MB3117namp_" --_000_MN2PR13MB31179DB87C96DA218F9EB1D0F2B40MN2PR13MB3117namp_ Content-Type: text/plain; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable Hi Gyan, Thanks much for your questions. My answers/explanations are inline belo= w. Best Regards, Huaimo ________________________________ From: Gyan Mishra Sent: Thursday, May 21, 2020 10:13 PM To: Acee Lindem (acee) Cc: Huaimo Chen ; lsr@ietf.org Subject: Re: [Lsr] Flooding Topology Computation Algorithm - draft-cc-lsr-f= looding-reduction-08 Working Group Adoption Call I think for both drafts it would be good to have a stick diagram at a minim= um. [HC]: A diagram for illustrating the steps of the algorithm is in Appendix. I majored in EE with math minor and both drafts are hard to follow without= a diagram with labels showing the exact topology examples. Four main topologies - full mesh, partial mesh and leaf spine ( 2 tier) and= CLOS ( 3 tier) - real world scenario=92s. >From the interim meeting was their a slide deck visual topology shared? [HC]: The set of slides presented in IETF 105 is attached. That would help. https://datatracker.ietf.org/doc/html/draft-cc-lsr-flooding-reduction-08 4.1 Step 1 - Build Cq candidate queue For each node B on FT whose D is one (from minimum to maximum node ID), find a link L attached to B such that L's remote node R has minimum D and ID, add link L between B and R into FT and increase B's D and R's D by one. Return FT. My interpretation is the algorithm an iterative loop and starts with any no= de in the candidate list so could start from edge and work left to right or= vice versa. For loop to build FT from Cq =3D with each node B with direct= ly attached node R via link L. Increment node B from Cq until the FT is bu= ild for all nodes. Instead of starting with a wide diameter FT matching ph= ysical topology we start micro topology with D=3D1 and go node by node. [HC]: This (For each node B on FT .... Return FT.) is an iterative loop aft= er every node is added to FT. This loop connects each node whose D =3D 1 (i= .e., there is only one link attached to it on FT) to a node through a link = on FT (i.e., add the link to FT) to make every node on FT to have its D > 1= . Page 5 of the attached slides shows some details for this loop. 4.2 1. Finding and removing the first element with node A in Cq that is not on FT and one PH's D in PHs < MaxD and PH's D < PH's ConMaxD. If A is root R0, then add the element into FT otherwise (i.e., A !=3D R0 with one PH's D in PHs < MaxD and PH's D < PH's ConMaxD. Assume that PH is the first one in PHs whose D < MaxD and PH's D < PH's ConMaxD), PH's D++, and add A with D =3D 1 and PHs =3D {PH} into FT. Note: if there is no element with a node in Cq satisfying the conditions, then algorithm may be restarted from R0, ++MaxD, Cq =3D {(R0,D=3D0,PHs =3D { })}, FT =3D { }; This is similar to 4.1 with micro topology with 2 directly connected nodes [HC]: It is similar to 1. in section 4.1. https://www.ietf.org/id/draft-chen-lsr-dynamic-flooding-algorithm-00.html My interpretation of the algorithm from the verbiage. So this draft starts in the middle of the topology and is geared towards le= af spine 2 or 3 tier clos topology. For this one we build the bi graph so that could be leaf connected to two s= pines or spine connected to two leafs and iteratively build out the FT topo= logy 3 node arch spine leaf spine or leaf spine leaf. Kind regards Gyan On Thu, May 21, 2020 at 7:01 PM Acee Lindem (acee) > wrote: Hi Gyan, From: Gyan Mishra > Date: Thursday, May 21, 2020 at 4:20 PM To: Acee Lindem > Cc: Huaimo Chen >, "lsr@ietf.org" > Subject: Re: [Lsr] Flooding Topology Computation Algorithm - draft-cc-lsr-f= looding-reduction-08 Working Group Adoption Call Yes and I have started reviewing the LSR mail archives as I am late in the = discussion for this. If you have link to any particular dates in the archives would be helpful. No =96 it was more an =93evolution=94 than an =93epiphany=94. That sums up all the questions I have so if all answered in the archives th= en I am all set. I support the draft moving forward as flood reduction is a much needed feat= ure. I think overall both drafts will really help large data centers with any ov= erlay underlay vxlan spine leaf meshed CLOS highly meshed topology that sca= les out horizontally with a large spine footprint - this is a much much nee= ded feature. This also helps eliminate complexity of the workaround of usi= ng BGP in the underlay which to me adds tremendous complexity. Here is the other recently presented dynamic flooding draft. https://datatracker.ietf.org/doc/draft-chen-lsr-dynamic-flooding-algorithm/= You can see they both make use of the dynamic flooding infra in https://dat= atracker.ietf.org/doc/draft-ietf-lsr-dynamic-flooding/ Thanks, Acee Kind regards Gyan On Thu, May 21, 2020 at 4:07 PM Acee Lindem (acee) > wrote: Speaking as WG Co-chair: Hi Gyan, I guess you=92ve joined this discussion late. It might be a good idea to re= view the LSR mailing list archives. From: Gyan Mishra > Date: Thursday, May 21, 2020 at 1:51 PM To: Huaimo Chen > Cc: Acee Lindem >, "lsr@ietf.org" > Subject: Re: [Lsr] Flooding Topology Computation Algorithm - draft-cc-lsr-f= looding-reduction-08 Working Group Adoption Call On Thu, May 21, 2020 at 11:01 AM Huaimo Chen > wrote: Hi Gyan, Thanks much for your questions. Gyan> How does this draft compare to the WG LC draft for flood reduction. = Would they be two eventual standard options in the operators toolbox or c= ompeting features for optimized flood reduction. Would having two flood red= uction features standardized versus one default IGP flood reduction feature= be confusing for operators. Just as it was confusing to me. https://datatracker.ietf.org/doc/draft-ietf-lsr-dynamic-flooding/ [HC]: This draft plus the draft for flooding reduction can provide two = modes of flooding reductions (i.e., centralized mode and distributed mode).= The latter describes the two modes, but does not include any flooding topo= logy computation algorithm for the distributed mode. The former proposes a = flooding topology computation algorithm to be used in the distributed mode. Gyan> It maybe a good idea for both documents to reference each other as= to how they play together or in some respects if any provide a homogeneou= s complete holistic solution for flooding problem being solved. It is a good idea to have this new draft reference the dynamic-flooding but= not vice-versa. The existing dynamic flooding draft provides a framework f= or any dynamic flooding algorithm that provides a separate flooding topolog= y. This algorithm is just the first to be formally proposed in a draft. Not= e that another algorithm was presented during the LSR virtual interim which= replaced IETF 107. In my opinion it may not be a bad idea even to combine both drafts so the s= olution is complete and holistic. This will also make the overall specific= ation flow nicely. No =96 we=92re not going to do this. Thanks, Acee I know that efforts were made by LSR to have a common IGP solution, however= there are many inherent differences between ISIS and OSPF that from IGP Li= nk state protocol perspective you can treat like apples to apples but reall= y it=92s apples and oranges. Maybe it might we wise to have separate draft= for both and have references linking together as the same algorithm concep= t and mathematically however the actual code implementation would vary as t= he LSDB link state data structures are completely different. Later =3D Dynamic flooding =3D 2 modes Centralized leader based and distrib= uted https://datatracker.ietf.org/doc/draft-ietf-lsr-dynamic-flooding/ This later draft per section excerpt provides both centralized and distribu= ted algorithm see below 6.4. A= rea Leader Responsibilities If the Area Leader operates in centralized mode, it MUST advertise algorithm 0 in its Area Leader Sub-TLV. In order for Dynamic Flooding to be enabled it also MUST compute and advertise a flooding topology for the area. The Area Leader may update the flooding topology at any time, however, it should not destabilize the network with undue or overly frequent topology changes. If the Area Leader operates in centralized mode and needs to advertise a new flooding topology, it floods the new flooding topology on both the new and old flooding topologies. If the Area Leader operates in distributed mode, it MUST advertise a non-zero algorithm in its Area Leader Sub-TLV. When the Area Leader advertises algorithm 0 in its Area Leader Sub- TLV and does not advertise a flooding topology, Dynamic Flooding is disabled for the area. Note this applies whether the Area Leader intends to operate in centralized mode or in distributed mode. Note that once Dynamic Flooding is enabled, disabling it risks destabilizing the network. 6.5= . Distributed Flooding Topology Calculation If the Area Leader advertises a non-zero algorithm in its Area Leader Sub-TLV, all nodes in the area that support Dynamic Flooding and the value of algorithm advertised by the Area Leader MUST compute the flooding topology based on the Area Leader's advertised algorithm. Nodes that do not support the value of algorithm advertised by the Area Leader MUST continue to use standard flooding mechanism as defined by the protocol. Nodes that do not support the value of algorithm advertised by the Area Leader MUST be considered as Dynamic Flooding incapable nodes by the Area Leader. If the value of the algorithm advertised by the Area Leader is from the range 128-254 (private distributed algorithms), it is the responsibi= lity of the network operator to guarantee that all nodes in the area have a common unde= rstanding of what the given algorithm value represents. Former =3D WG LC https://datatracker.ietf.org/doc/html/draft-cc-lsr-flooding-reduction-08 Provides algorithm for distributed mode for this draft as well as the algor= ithm to be used for distributed mode later dynamic flooding draft Separate question- In light of the flooding algorithm and seeing that at the bottom of section= 6.5 mentions flooding algorithm are the IANA codepoints reserved for flood= ing unique and non overlapping with the flex algo codepoints I believe 0-12= 7. I would think the flooding algorithm range of values is completely sepa= rate since a different function then flex algo values. https://datatracker.ietf.org/doc/html/draft-ietf-lsr-flex-algo-07 Best Regards, Huaimo ________________________________ From: Gyan Mishra > Sent: Thursday, May 21, 2020 10:36 AM To: Huaimo Chen > Cc: Acee Lindem (acee) >; lsr@ietf.org > Subject: Re: [Lsr] Flooding Topology Computation Algorithm - draft-cc-lsr-f= looding-reduction-08 Working Group Adoption Call On Wed, May 20, 2020 at 11:59 PM Huaimo Chen > wrote: Hi Gyan, Thanks much for your questions. My answers are inline below with [HC]. Best Regards, Huaimo ________________________________ From: Gyan Mishra > Sent: Wednesday, May 20, 2020 11:14 AM To: Huaimo Chen > Cc: Acee Lindem (acee) >; lsr@ietf.org > Subject: Re: [Lsr] Flooding Topology Computation Algorithm - draft-cc-lsr-f= looding-reduction-08 Working Group Adoption Call Huaimo This is a much needed feature that operators have been needing for densely = meshed topologies that commonly exist in data centers to accommodate very h= igh bandwidth E-W traffic. [HC]: Thank you very much. Below is link from Cisco which has introduced feature for dynamic flooding = in clos high density ECMP data center topologies. Please look at the feature description and it does seem to be exactly the s= ame as this draft. Please confirm. [HC]: It seems different. There maybe other vendors due to industry demand have to get the feature de= ployed before it reaches standards vendor consensus with the IETF. https://www.cisco.com/c/en/us/products/collateral/switches/nexus-9000-serie= s-switches/white-paper-c11-743015.html We are testing this feature and planning to deploy but wanted to ensure tha= t this is the same as the draft on the standards track. [HC]: The feature appears implemented draft "Dynamic Flooding on Dense Grap= hs", which does not include any flooding topology computation algorithm.. Gyan> How does this draft compare to the WG LC draft for flood reductio= n. Would they be two eventual standard options in the operators toolbox o= r competing features for optimized flood reduction. Would having two flood = reduction features standardized versus one default IGP flood reduction feat= ure be confusing for operators. Just as it was confusing to me. https://datatracker.ietf.org/doc/draft-ietf-lsr-dynamic-flooding/ Kind regards Gyan On Tue, May 19, 2020 at 11:52 PM Huaimo Chen > wrote: Hi Gyan, Thank you very much for your questions and support. This Flooding Topology Computation algorithm can be used in the Dynamic= Flooding on Dense Graphs to compute the flooding topologies for the data c= enter clos dense meshed topologies with many ECMP paths. It can be used by = the area leader in the centralized mode to compute the flooding topology. Best Regards, Huaimo ________________________________ From: Lsr > on behalf of = Gyan Mishra > Sent: Tuesday, May 19, 2020 2:39 AM To: Yanhe Fan > Cc: lsr@ietf.org >; = Acee Lindem (acee) > Subject: Re: [Lsr] Flooding Topology Computation Algorithm - draft-cc-lsr-f= looding-reduction-08 Working Group Adoption Call I support WG adoption and have a few questions related to the draft. Does this flooding algorithm use the dynamic flooding algorithm used in dat= a center clos dense meshed topologies with many ECMP paths where the flood = is decoupled from the physical topology. In the dynamic flooding algorithm= mentioned in centralized mode the flooding is computed by the area leader = and distributed to all nodes. In distributed mode each mode the area leade= r determines the algorithm and then each node computes the flooding topolog= y based on the algorithm. This dynamic algorithm for optimized flood reduction would reduce the amoun= t of redundant flooding in highly densely meshed ospf or Isis topologies. = So this optimization of flooding would improving overall link state routing= protocol convergence. Gyan On Mon, May 18, 2020 at 3:37 PM Yanhe Fan > wrote: Support it as a co-author. Thanks, Yanhe From: Lsr > On Behalf Of = Acee Lindem (acee) Sent: Friday, May 15, 2020 3:40 PM To: lsr@ietf.org Subject: [Lsr] Flooding Topology Computation Algorithm - draft-cc-lsr-flood= ing-reduction-08 Working Group Adoption Call This begins a 3 week (due to holidays) WG adoption call for the =93Flooding= Topology Computation Algorithm=94 draft. Please issue your support or obje= ction to this list by 11:59 PM, UTC on June 5th, 2020. Here is a URL for yo= ur convenience. https://datatracker.ietf.org/doc/draft-cc-lsr-flooding-reduction/ Thanks, Acee _______________________________________________ Lsr mailing list Lsr@ietf.org https://www.ietf.org/mailman/listinfo/lsr -- Error! Filename not specified. Gyan Mishra Network Solutions Ar= chitect M 301 502-1347 13101 Columbia Pike Silver Spring, MD -- Error! Filename not specified. Gyan Mishra Network Solutions Architect M 301 502-1347 13101 Columbia Pike<= https://nam11.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fwww.goo= gle.com%2Fmaps%2Fsearch%2F13101%2BColumbia%2BPike%2B%250D%250A%2BSilver%2BS= pring%2C%2BMD%3Fentry%3Dgmail%26source%3Dg&data=3D02%7C01%7Chuaimo.chen%40f= uturewei.com%7Cc9f9e8ddb76b406057d208d7fdf5cb4e%7C0fee8ff2a3b240189c753a1d5= 591fedc%7C1%7C0%7C637257104446501852&sdata=3DeCAT1E6b8XpInRH0rt3JhcsRLGIoq3= 2a5UOw84kqLQw%3D&reserved=3D0> Silver Spring, MD -- Error! Filename not specified. Gyan Mishra Network Solutions Architect M 301 502-1347 13101 Columbia Pike Silver Spring, MD -- Error! Filename not specified. Gyan Mishra Network Solutions Architect M 301 502-1347 13101 Columbia Pike Silver Spring, MD -- [Image removed by sender.] Gyan Mishra Network Solutions Architect M 301 502-1347 13101 Columbia Pike Silver Spring, MD -- [http://ss7.vzw.com/is/image/VerizonWireless/vz-logo-email] Gyan Mishra Network Solutions Architect M 301 502-1347 13101 Columbia Pike Silver Spring, MD --_000_MN2PR13MB31179DB87C96DA218F9EB1D0F2B40MN2PR13MB3117namp_ Content-Type: text/html; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable
Hi Gyan,

    Thanks much for your questions. My answers/explanations are i= nline below.

Best Regards,
Huaimo
From: Gyan Mishra <hayab= usagsm@gmail.com>
Sent: Thursday, May 21, 2020 10:13 PM
To: Acee Lindem (acee) <acee@cisco.com>
Cc: Huaimo Chen <huaimo.chen@futurewei.com>; lsr@ietf.org <= lsr@ietf.org>
Subject: Re: [Lsr] Flooding Topology Computation Algorithm - draft-c= c-lsr-flooding-reduction-08 Working Group Adoption Call
 

I think for both drafts it would be good to have a stick = diagram at a minimum.  
[HC]: A diagram for illustrating the steps of the algorit= hm is in Appendix.
I majored in EE with math  minor and both drafts are= hard to follow without a diagram with labels showing the exact topology ex= amples.  

Four main topologies - full mesh, partial mesh and leaf s= pine ( 2 tier) and CLOS ( 3 tier) - real world scenario=92s.

From the interim meeting was their a slide deck visual to= pology shared? 
[HC]: The set of slides presented in IETF 105 is attached= .

That would help.

4.1 

Step 1 - Build Cq candidate queue 

For each node B on FT whose D is one=
 (from minimum to maximum=0A=
       node ID), find a link L attached to B such that L's remote node R=0A=
       has minimum D and ID, add link L between B and R into FT and=0A=
       increase B's D and R's D by one.  Return FT.
My interpretation is the algorithm an iterative loop and = starts with any node in the candidate list so could start from edge and wor= k left to right or vice versa.  For loop to build FT from Cq =3D with = each node B with directly attached node R via link L.  Increment node B from Cq until the FT is build for all n= odes.  Instead of starting with a wide diameter FT matching physical t= opology we start micro topology with D=3D1 and go node by node.
[HC]: This (For each node B on FT .... Return FT.) is&nbs= p;an iterative loop after every node is added to FT. This loop connects each no= de whose D =3D 1 (i.e., there is only one link attached to it on FT) to a n= ode through a link on FT (i.e., add the link to FT) to make every node on F= T to have its D > 1. Page 5 of the attached slides shows some details for this loop.

4.2 

1.  Finding and removing the first e=
lement with node A in Cq that is=0A=
       not on FT and one PH's D in PHs < MaxD and PH's D < PH's ConMa=
xD.=0A=
=0A=
       If A is root R0, then add the element into FT=0A=
=0A=
       otherwise  (i.e., A !=3D R0 with one PH's D in PHs < MaxD and PH'=
s=0A=
          D < PH's ConMaxD.  Assume that PH is the first one in PHs=0A=
          whose D < MaxD and PH's D < PH's ConMaxD), PH's D++=
, and add A=0A=
          with D =3D 1 and PHs =3D {PH} into FT.=0A=
=0A=
       Note:  if there is no element with a node in Cq satisfying the=0A=
          conditions, then algorithm may be restarted from R0, ++Ma=
xD,=0A=
          Cq =3D {(R0,D=3D0,PHs =3D { })}, FT =3D { };
This is similar to 4.1 with micro topology with 2 directl= y connected nodes 
[HC]: It is similar to 1. in section 4.1.

My interpretation of the algorithm from the verbiage.

So this draft starts in the middle of the topology and is= geared towards leaf spine 2 or 3 tier clos topology.

For this one we build the bi graph so that could be leaf = connected to two spines or spine connected to two leafs and iteratively bui= ld out the FT topology 3 node arch  spine leaf spine or leaf spine lea= f.

Kind regards 

Gyan

On Thu, May 21, 2020 at 7:01 PM Ace= e Lindem (acee) <acee@cisco.com>= ; wrote:

Hi Gyan,

 

From: Gyan Mishra <hayabusagsm@gmail.co= m>
Date: Thursday, May 21, 2020 at 4:20 PM
To: Acee Lindem <acee@cisco.com>
Cc: Huaimo Chen <huaimo.chen@futurewei.com>, "lsr@ietf.org" <lsr@ietf.org>
Subject: Re: [Lsr] Flooding Topology Computation Algorithm - draft-c= c-lsr-flooding-reduction-08 Working Group Adoption Call

 

 

Yes and I have started= reviewing the LSR mail archives as I am late in the discussion for this.

 

If you have link to an= y particular dates in the archives would be helpful.

 

No =96 it was more an =93evolution=94 than an =93e= piphany=94.

 

That sums up all the q= uestions I have so if all answered in the archives then I am all set.

 

I support the draft mo= ving forward as flood reduction is a much needed feature.  <= /u>

 

I think overall both d= rafts will really help large data centers with any overlay underlay vxlan s= pine leaf meshed CLOS highly meshed topology that scales out horizontally w= ith a large spine footprint - this is a much much needed feature.  This also helps eliminate complexity of = the workaround of using BGP in the underlay which to me adds tremendous com= plexity.

 

Here is the other recently presented dynamic flood= ing draft.

 

https://datatracker.ietf.org/doc/draft-chen-= lsr-dynamic-flooding-algorithm/

 

You can see they both make use of the dynamic floo= ding infra in https://datatracker.ietf.org/doc/draft-ietf-lsr-dynamic-flooding/

 

Thanks,

Acee

 

 

 

 

Kind regards <= /u>

 

Gyan 

 

On Thu, May 21, 2020 a= t 4:07 PM Acee Lindem (acee) <acee@cisco.com> wrote:

Speaking as WG Co-chai= r:

 

Hi Gyan,

 

I guess you=92ve joine= d this discussion late. It might be a good idea to review the LSR mailing l= ist archives.

 

From: Gyan Mishra <hayabusagsm@gmail.co= m>
Date: Thursday, May 21, 2020 at 1:51 PM
To: Huaimo Chen <huaimo.chen@futurewei.com>
Cc: Acee Lindem <acee@cisco.com>, "lsr@ietf.org" <lsr@ietf.org>
Subject: Re: [Lsr] Flooding Topology Computation Algorithm - draft-c= c-lsr-flooding-reduction-08 Working Group Adoption Call

 

 

 

On Thu, May 21, 2020 at = 11:01 AM Huaimo Chen <huaimo.chen@futurewei.com> wrote:

Hi Gyan,

 

    Thanks much for your questions.=

 

 Gyan> How does this draft compare to the WG LC= draft for flood reduction.  Would they be two eventual standard optio= ns in the operators toolbox  or competing features for optimized flood reduction. Would having two flood reduction features s= tandardized versus one default IGP flood reduction feature be confusing for= operators.  Just as it was confusing to me. 

 

    [HC]: This draft plus the draft for flood= ing reduction can provide two modes of flooding reductions (i.e., centraliz= ed mode and distributed mode). The latter describes the two modes, but does not include any flooding topology computation algo= rithm for the distributed mode. The former proposes a flooding topology computation algorithm to be used i= n the distributed mode.  

 

   Gyan> It= maybe a good idea for both documents to reference each other as to how the= y play together or  in some respects if any provide a homogeneous comp= lete holistic solution for flooding problem being solved.  

 

It is a good idea to h= ave this new draft reference the dynamic-flooding but not vice-versa. The e= xisting dynamic flooding draft provides a framework for any dynamic floodin= g algorithm that provides a separate flooding topology. This algorithm is just the first to be formally propose= d in a draft. Note that another algorithm was presented during the LSR virt= ual interim which replaced IETF 107.  

 

In my opinion it may not= be a bad idea even to combine both drafts so the solution is complete and = holistic.  This will also make the overall specification flow nicely. =  

 

No =96 we=92re not goi= ng to do this.

 

Thanks,<= /p>

Acee

 

I know that efforts were= made by LSR to have a common IGP solution, however there are many inherent= differences between ISIS and OSPF that from IGP Link state protocol perspe= ctive you can treat like apples to apples but really it=92s apples and oranges.  Maybe it might we wise to have= separate draft for both and have references linking together as the same a= lgorithm concept and mathematically however the actual code implementation = would vary as the LSDB link state data structures are completely different. 

 

Later =3D Dynamic floodi= ng =3D 2 modes Centralized leader based and distributed =

 

This later draft per sec= tion excerpt provides both centralized and distributed algorithm see below&= nbsp;

 

<=
a href=3D"https://nam11.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F=
%2Fdatatracker.ietf.org%2Fdoc%2Fhtml%2Fdraft-ietf-lsr-dynamic-flooding-05%2=
3section-6.4&data=3D02%7C01%7Chuaimo.chen%40futurewei.com%7Cc9f9e8ddb76=
b406057d208d7fdf5cb4e%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C0%7C63725710=
4446401884&sdata=3DK%2BSin3SGk78gUaBME9B5UjYUncvtprSkvLZOF1UWxQE%3D&=
;reserved=3D0" originalsrc=3D"https://datatracker.ietf.org/doc/html/draft-i=
etf-lsr-dynamic-flooding-05#section-6.4" shash=3D"ABXGirY51l+h0hDocl7p3=
IAr0cIkJf5N3uV4IuEMQhEGwJ77JCAjVmAACBhE7+a6Fw+KFAMSycAWyZtYnJP7Sbsa=
tnYa9CHiVv9t2u1MOXxZ76LDag6Wltu289na1Ea5pFQAk4LDMG4P+f1NHmE7jScXoaOdcT6=
5nQuN3ekCMjY=3D" target=3D"_blank" style=3D"font-family:monospace">6.4.  A=
rea Leader Responsibilities
 
   If the Area Leader operates in ce=
ntralized mode, it MUST advertise=

   algorithm 0 in its Area Leader Su=
b-TLV.  In order for Dynamic=

   Flooding to be enabled it also MU=
ST compute and advertise a flooding
   topology for the area.  The =
Area Leader may update the flooding
   topology at any time, however, it=
 should not destabilize the network
   with undue or overly frequent top=
ology changes.  If the Area Leader
   operates in centralized mode and =
needs to advertise a new flooding=

   topology, it floods the new flood=
ing topology on both the new and old
   flooding topologies.

 


   If the Area Leader operates in di=
stributed mode, it MUST advertise a


   non-zero algorithm in its Area Le=
ader Sub-TLV.


 


   When the Area Leader advertises a=
lgorithm 0 in its Area Leader Sub-


   TLV and does not advertise a floo=
ding topology, Dynamic Flooding is


   disabled for the area.  Note=
 this applies whether the Area Leader


   intends to operate in centralized=
 mode or in distributed mode.=



 


   Note that once Dynamic Flooding i=
s enabled, disabling it risks=



   destabilizing the network.=
<=
/u>


 


<=
a href=3D"https://nam11.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F=
%2Fdatatracker.ietf.org%2Fdoc%2Fhtml%2Fdraft-ietf-lsr-dynamic-flooding-05%2=
3section-6.5&data=3D02%7C01%7Chuaimo.chen%40futurewei.com%7Cc9f9e8ddb76=
b406057d208d7fdf5cb4e%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C0%7C63725710=
4446411879&sdata=3DeqK0e8YFYfRgXo%2F6K%2BSPT3mCdFXDoME6gMLUp%2BcVjB4%3D=
&reserved=3D0" originalsrc=3D"https://datatracker.ietf.org/doc/html/dra=
ft-ietf-lsr-dynamic-flooding-05#section-6.5" shash=3D"hVGmHz7P6kR9GWPe55qsm=
yFaKCrdTqD/+d0FVH9z31HuQp+d6lWA72BbEX6/xNbLHGwY2C7Z9Knx/3aVoQCq4qXc=
M/YLGtaoYaNmj4MZH4YX9LLmvPh+rdKoePJRi1AZN3955giBI6snbGDbYyYwJBneQ0y+=
;6MKu+LcmUuqy39I=3D" target=3D"_blank" style=3D"font-family:monospace">=
6.5.=
  Distributed Flooding Topology Calculation

 


   If the Area Leader advertises a n=
on-zero algorithm in its Area Leader


   Sub-TLV, all nodes in the area th=
at support Dynamic Flooding and the


   value of algorithm advertised by =
the Area Leader MUST compute the<=
/u>


   flooding topology based on the Ar=
ea Leader's advertised algorithm.=



 


   Nodes that do not support the val=
ue of algorithm advertised by the=



   Area Leader MUST continue to use =
standard flooding mechanism as


   defined by the protocol.


 


   Nodes that do not support the val=
ue of algorithm advertised by the=



   Area Leader MUST be considered as=
 Dynamic Flooding incapable nodes by


   the Area Leader.

 


   If the value of the algorithm adv=
ertised by the Area Leader is from


   the range 128-254 (private distri=
buted algorithms), it is the responsibility of the 


network operator=
 to guarantee that all nodes in the area have a common understanding of wha=
t the given algorithm value represents.


 =

Former =3D WG LC 

Provides algorithm for d= istributed mode for this draft as well as the algorithm to be used for dist= ributed mode later dynamic flooding draft 

 

Separate question-

 

In light of the flooding= algorithm and seeing that at the bottom of section 6.5 mentions flooding a= lgorithm are the IANA codepoints reserved for flooding unique and non overl= apping with the flex algo codepoints I believe 0-127.  I would think the flooding algorithm range of value= s is completely separate since a different function then flex algo values.<= u>

 

 

 

On Wed, May 20, 2020 at = 11:59 PM Huaimo Chen <huaimo.chen@futurewei.com> wrote:

Hi Gyan,

 

    Thanks much for your questions. My answer= s are inline below with [HC].

 

Best Regards,

Huaimo

From: Gyan Mishra <hayabusagsm@gmail.com>
Sent: Wednesday, May 20, 2020 11:14 AM
To: Huaimo Chen <huaimo.chen@futurewei.com>
Cc: Acee Lindem (acee) <acee=3D40cisco.com@dmarc.ietf.org>; lsr@ietf.org <lsr@ietf.org>
Subject: Re: [Lsr] Flooding Topology Computation Algorithm - draft-c= c-lsr-flooding-reduction-08 Working Group Adoption Call

 

Huaimo 

 

This is a much needed fe= ature that operators have been needing for densely meshed topologies that c= ommonly exist in data centers to accommodate very high bandwidth E-W traffi= c.

[HC]: Thank you very muc= h.

 

Below is link from Cisco= which has introduced feature for dynamic flooding in clos high density ECM= P data center topologies.

 

Please look at the featu= re description and it does seem to be exactly the same as this draft. = Please confirm. 

[HC]: It seems different= . 

 

There maybe other vendor= s due to industry demand have to get the feature deployed before it reaches= standards vendor consensus with the IETF.

 

 

We are testing this feat= ure and planning to deploy but wanted to ensure that this is the same as th= e draft on the standards track.

[HC]: The feature appears implemented draft "Dynamic Flooding on Dense Graph= s", which does not include any flooding topology computation algorithm= .. 

 

    Gyan> H= ow does this draft compare to the WG LC draft for flood reduction.  Wo= uld they be two eventual standard options in the operators toolbox  or= competing features for optimized flood reduction. Would having two flood reduction features standardized versus one default IGP flood red= uction feature be confusing for operators.  Just as it was confusing t= o me.

 

 

Kind regards 

 

Gyan

 

 

On Tue, May 19, 2020 at = 11:52 PM Huaimo Chen <huaimo.chen@futurewei.com> wrote:

Hi Gyan,=

 

    Thank you v= ery much for your questions and support.

 

    This Flooding Topology Computation algorithm can be used in the Dynamic Flooding on Dense Graphs = to compute the flooding topologies for the data center clos dense mesh= ed topologies with many ECMP paths. It can be used by the area leader in th= e centralized mode to compute the flooding topology.   

 

Best Regards,

Huaimo

From: Lsr <lsr-bounces@ietf.org> on = behalf of Gyan Mishra <hayabusagsm@gmail.com>
Sent: Tuesday, May 19, 2020 2:39 AM
To: Yanhe Fan <yfan@casa-systems.com>
Cc: lsr@ietf.org <lsr@ietf.org&g= t;; Acee Lindem (acee) <acee=3D40cisco.com@dmarc.ietf.org>
Subject: Re: [Lsr] Flooding Topology Computation Algorithm - draft-c= c-lsr-flooding-reduction-08 Working Group Adoption Call

 

 

I support WG adoption an= d have a few questions related to the draft.

 

Does this flooding algor= ithm use the dynamic flooding algorithm used in data center clos dense mesh= ed topologies with many ECMP paths where the flood is decoupled from the ph= ysical topology.  In the dynamic flooding algorithm mentioned in centralized mode the flooding is computed by the ar= ea leader and distributed to all nodes.  In distributed mode each mode= the area leader determines the algorithm and then each node computes the f= looding topology based on the algorithm.  

 

This dynamic algorithm f= or optimized flood reduction would reduce the amount of redundant flooding = in highly densely meshed ospf or Isis topologies.  So this optimizatio= n of flooding would improving overall link state routing protocol convergence.

 

Gyan =

 

On Mon, May 18, 2020 at = 3:37 PM Yanhe Fan <yfan@casa-systems.com> wrote:

Support it as a co-author.

 

Thanks,

Yanhe

________________________= _______________________
Lsr mailing list
Lsr@ietf.org
https://www.ietf.org/mailman/listinfo/lsr<= /a>

--

<= span style=3D"font-family:Arial,sans-serif; color:black">Gyan Mishra=

<= span style=3D"font-family:Georgia,serif; color:black">Network Solutions Arc= hitect 

<= span style=3D"font-family:Georgia,serif; color:black">M 301 502-1347
13101 Columbia Pike 
Silver Spring, MD

 

--

<= span style=3D"font-family:Arial,sans-serif; color:black">Gyan Mishra=

<= span style=3D"font-family:Georgia,serif; color:black">Network Solutions Arc= hitect 

<= span style=3D"font-family:Georgia,serif; color:black">M 301 502-1347
13101 Columbia Pike 
Silver Spring, MD

 

--

3D"Image

Gyan Mishra

Network Solutions A= rchitect =

M 301 502-1347
13= 101 Columbia Pike 
Silver Spring, MD

 

--

Gyan Mishra

Network Solutio= ns Architect&= nbsp;

M 301 502-1347
13101 Columbia Pike 
Silver Spring, MD


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s=20161025; h=from:in-reply-to:references:mime-version:date:message-id:subject:to :cc:content-transfer-encoding; bh=Q+r9VrrEDxjffKFTgr0yjpSyNYJif+IV4+2yWjW8JFs=; b=k6SUqQ8rp0EQqqlOI7oeDAZbHk5lJ9Q40D7YCzHl2OjcIOxcsiPBzZHCeqqbI3qBYM LoB8paEol/Ig/02F9d33qkBVOstO9sNj3qBO4CwGnqHhFqhWWdxiHeRVpqXKIMA22l+5 FYAJw3Txp8QX1pXDKkXVmvjpV+Gwuonf1EluO06zTi/BTJjv/bgbuqiTg0mHRZhD1y4x zOZWM1oSifk4gUQp6GXKHnXpWP/+Q6r8d5HcMWA7k4xumfxNp5D6QP2BWwidDhYe9gC1 MobKPxxtUYlbLeMNQrXo49dI5USRwvZqwqIEdL5iNko10Ez//1n65tpRgbBEC5iaddd3 a3fg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:in-reply-to:references:mime-version:date :message-id:subject:to:cc:content-transfer-encoding; bh=Q+r9VrrEDxjffKFTgr0yjpSyNYJif+IV4+2yWjW8JFs=; b=FhqG1a0BUfyVuoueVtSQUMx9MrnNp7YQI6Syr/1irHrOAQrHPrbLNmb+Qa8pEQbbJa XYzYtcZl3Cm5JyVdtBuCTsyLuIg5KBo/blToWlFZJ9OKdBAZhBaKHNYgghChiw3uOrsj nlS4k6W6iMYkWGo3MSg/iu2e//yYJSwsMWwZsNR9djNJGNfrw8C8FjkM1PxfgeN2tKqT J2EtFrfTYbTfCmW3Hehii71iNuh+jybJSlMSmeKVdbYB3f1YycGplrcZ0dB+mXW1bRNk mQyBQoiTDuo5423xy/WIHbtYta4i5NDN+RW0TI8Yu92xTXNhe7lMIJCllf7Rr4U0jsCR hHJw== X-Gm-Message-State: AOAM533hC2eJISaCqjkprvwH6PnCBgCDQec9+1WWgB4AuKMfCxGvdDnh 86oyHL3kfext+xjk0Ji4ol2r0RbGaqm6DJ+lhGg= X-Google-Smtp-Source: ABdhPJybwEaNKB5ApNV7YweJd1vxJxuH8u31rYi9aomaJ3AQunmyOxTPx56DqRYHegkpar2ml7kw1hlMyp+XH9e4HGM= X-Received: by 2002:a5d:6943:: with SMTP id r3mr3638135wrw.113.1590159575143; Fri, 22 May 2020 07:59:35 -0700 (PDT) Received: from 1058052472880 named unknown by gmailapi.google.com with HTTPREST; Fri, 22 May 2020 14:59:34 +0000 From: Alvaro Retana In-Reply-To: <20200521193856.GJ58497@kduck.mit.edu> References: <158992828112.6026.1646593855480055081@ietfa.amsl.com> <1242ad52-bb48-8526-b65b-d413e0cd9e25@cisco.com> <20200521193856.GJ58497@kduck.mit.edu> MIME-Version: 1.0 Date: Fri, 22 May 2020 14:59:34 +0000 Message-ID: To: Benjamin Kaduk , Peter Psenak Cc: Acee Lindem , draft-ietf-isis-mpls-elc@ietf.org, The IESG , lsr-chairs@ietf.org, lsr@ietf.org Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Archived-At: Subject: Re: [Lsr] Benjamin Kaduk's Discuss on draft-ietf-isis-mpls-elc-12: (with DISCUSS and COMMENT) X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 22 May 2020 14:59:39 -0000 On May 21, 2020 at 3:39:03 PM, Benjamin Kaduk wrote: Peter: Hi! > With respect to Alvaro's clarification, your answer for (1) makes sense; > thanks! I think Alvaro has offered to help work out what (if any) > additional text we might want to be sure that the answer to (2) is clear = in > the document. I think that #1 is where some clarification could be useful. :-) I'm including both ISIS and OSPF suggestions below to consolidate the discussion. ... > > My interpretation of Ben's question is two-fold: > > > > (1) Would ISIS routers normally propagate the information to a > > different level? The ELC is a new prefix attribute flag -- are prefix > > attributes always propagated (unchanged) to other levels? If so, then > > the requirement (MUST) is not needed. My reading of rfc7794 is that > > the propagation is optional... > > depends on the attribute or a bit. Some are propagated some are not. > That's why we are saying this one MUST be preserved. Right. For ISIS I think the current text is in line with the specification of the other bits in rfc7794. =C2=A0No changes are needed. If anything, you may want to change the order of this sentence to address Ben's comment: OLD> =C2=A0 =C2=A0When a router propagates a prefix between ISIS levels ([RFC530= 2], it =C2=A0 =C2=A0MUST preserve the ELC signaling for this prefix. NEW> =C2=A0 =C2=A0The ELC signaling MUST be preserved when a router propagates a= prefix =C2=A0 =C2=A0between ISIS levels ([RFC5302]). [Similar for OSPF.] I think that for OSPF it is not that simple... For OSPFv2: rfc7684 says that the "scope of the OSPFv2 Extended Prefix Opaque LSA depends on the scope of the advertised prefixes", which I assume means that for intra-area prefixes the scope will be area-local...so the ABR wouldn't simply propagate it; it would have to originate a new LSA. Suggestion (Add to 3.1)> =C2=A0 =C2=A0When an OSPFv2 Area Border Router (ABR) distributes informatio= n between =C2=A0 =C2=A0connected areas it SHOULD originate an OSPFv2 Extended Prefix = Opaque LSA =C2=A0 =C2=A0[RFC7684] including the received ELC setting. =C2=A0If the rec= eived information =C2=A0 =C2=A0is included in an LSA with an AS-wide scope, then the new LSA = is not needed. For OSPFv3: The PrefixOptions are *in* the LSA, but I couldn't find anything in rfc5340 saying that the received values should be copied into the Inter-Area-Prefix-LSA (nor that they should not). Suggestion (Add to 3.2)> =C2=A0 =C2=A0When an OSPFv3 Area Border Router (ABR) distributes informatio= n between =C2=A0 =C2=A0connected areas, the setting of the ELC Flag in the Inter-Area= -Prefix-LSA =C2=A0 =C2=A0MUST be the same as the received value. > > (2) If the propagation is not automatic, and the L1L2 router doesn't > > support this specification, then what are the drawbacks/failure > > scenarios? IOW, for multi-level operation is it a requirement that > > the L1L2 support this specification? > > drawback are identical to what is mentioned in the Security > Considerations section. I think that text is ok. Thanks! Alvaro. From nobody Fri May 22 17:42:00 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 99B2D3A0E63 for ; Fri, 22 May 2020 17:41:57 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.086 X-Spam-Level: X-Spam-Status: No, score=-2.086 tagged_above=-999 required=5 tests=[AC_DIV_BONANZA=0.001, BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_REMOTE_IMAGE=0.01, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 96-h1vFgEgS5 for ; Fri, 22 May 2020 17:41:51 -0700 (PDT) Received: from mail-il1-x135.google.com (mail-il1-x135.google.com [IPv6:2607:f8b0:4864:20::135]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 5A53D3A0E61 for ; Fri, 22 May 2020 17:41:51 -0700 (PDT) Received: by mail-il1-x135.google.com with SMTP id a14so12614343ilk.2 for ; Fri, 22 May 2020 17:41:51 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=cZCtOdWXC9PBORBcrqpryPFqE9xwEfrjG4qBjMqQIug=; b=lxxeBz4OheKrZ9qhQISkRF7gFSaySefC9ffaZBe+RXrRHUFkvm5j7l0CdVxa+MY4cW GmBZ2pmscbYT8G31EPjwR+5Kccn7DntYt1QJpuUpqVTBZbVyjzCqEvU1tan5UGPX98ay izfNrfiqfQ8NmfxqHJTWCRe+YbhNSIKQlCRhyUAb1d5itwWcul71lgYyElX2LLGiLk/u 3UFoj7PGpGNHVJvNUCd3trFMRzip9G9D9fHsAlKYSH+D/aIACdprpVcCcRLds6d2L+jG rSZrxPhgf1+0z3Scn7hnsiKCIa3OeadSa+ysGrGdD10EKecpO3T+KuNkeK9T+1xLBGCe no0w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=cZCtOdWXC9PBORBcrqpryPFqE9xwEfrjG4qBjMqQIug=; b=maE/jiB4VpfLss1CIZ5ZLUZXbg7ywFdFguoMc4FfBllQXGlI2UnzphYYCTjXmzF65z RgbLDQyqnMcAVmEkf1bYsat14TFGNgK+xtHK66mUZx0F9h9KCtccony+MvvS3N2Mha4W Yg57hAdCwssCFfbA/oZ0M/NeV8YTxwRTlSbZhmRcsca/mRQLsAqYBflWj/5HFLOHwRWR 9/JTAizVfDBfHGRfTpycrtiyCmgq48Szn8mrOE1CNzSLuSzpTONR5Oup2ww53xlynlDE cCfjEOkz0qDoM9MgInDwmyZ0kYysuzbVzjf86i0tWe9c0y9eMgNfuHkv4AfrHssKvWOJ jb7w== X-Gm-Message-State: AOAM531E42WpxgPlwH8uwnzO6P2kZtPN22hz5+oWg0Cix9zy81xSsoaH NrxCQ+v5Ai5ntadikw6LWC0B7DrGZof+r7IMhwI= X-Google-Smtp-Source: ABdhPJwP/pGuMBsA0Pxg3c0Qe8uf/u3gFUZr5trbTVa+4jXeqg5X4iLRY3B52cDx33ExrkMOQu7UCjJfbcx0BX5cMf0= X-Received: by 2002:a92:c948:: with SMTP id i8mr16026946ilq.258.1590194509186; Fri, 22 May 2020 17:41:49 -0700 (PDT) MIME-Version: 1.0 References: <63330FD6-EDE8-4938-AA85-948279C57E34@cisco.com> <424B17B1-D66D-4708-A819-855E972841AF@cisco.com> In-Reply-To: From: Gyan Mishra Date: Fri, 22 May 2020 20:41:37 -0400 Message-ID: To: Huaimo Chen Cc: "Acee Lindem (acee)" , "lsr@ietf.org" Content-Type: multipart/alternative; boundary="000000000000d80d2505a6460281" Archived-At: Subject: Re: [Lsr] Flooding Topology Computation Algorithm - draft-cc-lsr-flooding-reduction-08 Working Group Adoption Call X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 23 May 2020 00:41:59 -0000 --000000000000d80d2505a6460281 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hi Huaimo Thank you for the slide deck. That really helps understand the algorithm. I will let you know if I have any questions. The goal of the algorithm is to speed up convergence by limiting the convergence scope and expanding out 1 link at a time until all nodes and links are part of the flood scope. From the examples in the slide deck I did not see mentioned what is done with the dynamic flooding algorithm where when you have a meshed network in the slide 5 examples, how do you limit the flooding on redundant links duplicate flooding with the many meshed paths as you iteratively grow the FT nodes scope Cq(). I believe with the dynamic flooding it does a degree of 2 so 2 links between nodes. I think with clos spine leaf the mesh is much more intensive and problematic with ECMP then a circular topology nodal mesh that results in duplicate redundant flooding that slows down convergence. With spine leaf it=E2=80=99s like an X horizontal width axis and then depth is spine to lea= f links. With spine leaf as you grow sideways and the spine expand the redundant ECMP grows and redundant flooding grows exponentially and is much worse then circular nodal mesh. Thank you Gyan On Fri, May 22, 2020 at 10:05 AM Huaimo Chen wrote: > Hi Gyan, > > Thanks much for your questions. My answers/explanations are inline > below. > > Best Regards, > Huaimo > ------------------------------ > *From:* Gyan Mishra > *Sent:* Thursday, May 21, 2020 10:13 PM > *To:* Acee Lindem (acee) > *Cc:* Huaimo Chen ; lsr@ietf.org > *Subject:* Re: [Lsr] Flooding Topology Computation Algorithm - > draft-cc-lsr-flooding-reduction-08 Working Group Adoption Call > > > I think for both drafts it would be good to have a stick diagram at a > minimum. > [HC]: A diagram for illustrating the steps of the algorithm is in Appendi= x. > I majored in EE with math minor and both drafts are hard to follow > without a diagram with labels showing the exact topology examples. > > Four main topologies - full mesh, partial mesh and leaf spine ( 2 tier) > and CLOS ( 3 tier) - real world scenario=E2=80=99s. > > From the interim meeting was their a slide deck visual topology shared? > [HC]: The set of slides presented in IETF 105 is attached. > > That would help. > > https://datatracker.ietf.org/doc/html/draft-cc-lsr-flooding-reduction-08 > > > 4.1 > > Step 1 - Build Cq candidate queue > > For each node B on FT whose D is one (from minimum to maximum > node ID), find a link L attached to B such that L's remote node R > has minimum D and ID, add link L between B and R into FT and > increase B's D and R's D by one. Return FT. > > My interpretation is the algorithm an iterative loop and starts with any > node in the candidate list so could start from edge and work left to righ= t > or vice versa. For loop to build FT from Cq =3D with each node B with > directly attached node R via link L. Increment node B from Cq until the = FT > is build for all nodes. Instead of starting with a wide diameter FT > matching physical topology we start micro topology with D=3D1 and go node= by > node. > [HC]: This (For each node B on FT .... Return FT.) is an iterative loop > after every node is added to FT. This loop connects each node whose D =3D= 1 > (i.e., there is only one link attached to it on FT) to a node through a > link on FT (i.e., add the link to FT) to make every node on FT to have it= s > D > 1. Page 5 of the attached slides shows some details for this loop. > > 4.2 > > 1. Finding and removing the first element with node A in Cq that is > not on FT and one PH's D in PHs < MaxD and PH's D < PH's ConMaxD. > > If A is root R0, then add the element into FT > > otherwise (i.e., A !=3D R0 with one PH's D in PHs < MaxD and PH's > D < PH's ConMaxD. Assume that PH is the first one in PHs > whose D < MaxD and PH's D < PH's ConMaxD), PH's D++, and add A > with D =3D 1 and PHs =3D {PH} into FT. > > Note: if there is no element with a node in Cq satisfying the > conditions, then algorithm may be restarted from R0, ++MaxD, > Cq =3D {(R0,D=3D0,PHs =3D { })}, FT =3D { }; > > This is similar to 4.1 with micro topology with 2 directly connected node= s > [HC]: It is similar to 1. in section 4.1. > > https://www.ietf.org/id/draft-chen-lsr-dynamic-flooding-algorithm-00.html > > > My interpretation of the algorithm from the verbiage. > > So this draft starts in the middle of the topology and is geared towards > leaf spine 2 or 3 tier clos topology. > > For this one we build the bi graph so that could be leaf connected to two > spines or spine connected to two leafs and iteratively build out the FT > topology 3 node arch spine leaf spine or leaf spine leaf. > > Kind regards > > Gyan > > On Thu, May 21, 2020 at 7:01 PM Acee Lindem (acee) wrote= : > > Hi Gyan, > > > > *From: *Gyan Mishra > *Date: *Thursday, May 21, 2020 at 4:20 PM > *To: *Acee Lindem > *Cc: *Huaimo Chen , "lsr@ietf.org" < > lsr@ietf.org> > *Subject: *Re: [Lsr] Flooding Topology Computation Algorithm - > draft-cc-lsr-flooding-reduction-08 Working Group Adoption Call > > > > > > Yes and I have started reviewing the LSR mail archives as I am late in th= e > discussion for this. > > > > If you have link to any particular dates in the archives would be helpful= . > > > > No =E2=80=93 it was more an =E2=80=9Cevolution=E2=80=9D than an =E2=80=9C= epiphany=E2=80=9D. > > > > That sums up all the questions I have so if all answered in the archives > then I am all set. > > > > I support the draft moving forward as flood reduction is a much needed > feature. > > > > I think overall both drafts will really help large data centers with any > overlay underlay vxlan spine leaf meshed CLOS highly meshed topology that > scales out horizontally with a large spine footprint - this is a much muc= h > needed feature. This also helps eliminate complexity of the workaround o= f > using BGP in the underlay which to me adds tremendous complexity. > > > > Here is the other recently presented dynamic flooding draft. > > > > https://datatracker.ietf.org/doc/draft-chen-lsr-dynamic-flooding-algorith= m/ > > > > > You can see they both make use of the dynamic flooding infra in > https://datatracker.ietf.org/doc/draft-ietf-lsr-dynamic-flooding/ > > > > > Thanks, > > Acee > > > > > > > > > > Kind regards > > > > Gyan > > > > On Thu, May 21, 2020 at 4:07 PM Acee Lindem (acee) wrote= : > > Speaking as WG Co-chair: > > > > Hi Gyan, > > > > I guess you=E2=80=99ve joined this discussion late. It might be a good id= ea to > review the LSR mailing list archives. > > > > *From: *Gyan Mishra > *Date: *Thursday, May 21, 2020 at 1:51 PM > *To: *Huaimo Chen > *Cc: *Acee Lindem , "lsr@ietf.org" > *Subject: *Re: [Lsr] Flooding Topology Computation Algorithm - > draft-cc-lsr-flooding-reduction-08 Working Group Adoption Call > > > > > > > > On Thu, May 21, 2020 at 11:01 AM Huaimo Chen > wrote: > > Hi Gyan, > > > > Thanks much for your questions. > > > > Gyan> How does this draft compare to the WG LC draft for flood > reduction. Would they be two eventual standard options in the operators > toolbox or competing features for optimized flood reduction. Would havin= g > two flood reduction features standardized versus one default IGP flood > reduction feature be confusing for operators. Just as it was confusing t= o > me. > > https://datatracker.ietf.org/doc/draft-ietf-lsr-dynamic-flooding/ > > > > > [HC]: This draft plus the draft for flooding reduction can provide tw= o > modes of flooding reductions (i.e., centralized mode and distributed mode= ). > The latter describes the two modes, but does not include any flooding > topology computation algorithm for the distributed mode. The former > proposes a flooding topology computation algorithm to be used in the > distributed mode. > > > > Gyan> It maybe a good idea for both documents to reference each other > as to how they play together or in some respects if any provide a > homogeneous complete holistic solution for flooding problem being solved. > > > > It is a good idea to have this new draft reference the dynamic-flooding > but not vice-versa. The existing dynamic flooding draft provides a > framework for any dynamic flooding algorithm that provides a separate > flooding topology. This algorithm is just the first to be formally propos= ed > in a draft. Note that another algorithm was presented during the LSR > virtual interim which replaced IETF 107. > > > > In my opinion it may not be a bad idea even to combine both drafts so the > solution is complete and holistic. This will also make the overall > specification flow nicely. > > > > No =E2=80=93 we=E2=80=99re not going to do this. > > > > Thanks, > > Acee > > > > I know that efforts were made by LSR to have a common IGP solution, > however there are many inherent differences between ISIS and OSPF that fr= om > IGP Link state protocol perspective you can treat like apples to apples b= ut > really it=E2=80=99s apples and oranges. Maybe it might we wise to have s= eparate > draft for both and have references linking together as the same algorithm > concept and mathematically however the actual code implementation would > vary as the LSDB link state data structures are completely different. > > > > Later =3D Dynamic flooding =3D 2 modes Centralized leader based and > distributed > > > > https://datatracker.ietf.org/doc/draft-ietf-lsr-dynamic-flooding/ > > > > > This later draft per section excerpt provides both centralized and > distributed algorithm see below > > > > *6.4 = . Area Leader Responsibilities* > > > > If the Area Leader operates in centralized mode, it MUST advertise > > algorithm 0 in its Area Leader Sub-TLV. In order for Dynamic > > Flooding to be enabled it also MUST compute and advertise a flooding > > topology for the area. The Area Leader may update the flooding > > topology at any time, however, it should not destabilize the network > > with undue or overly frequent topology changes. If the Area Leader > > operates in centralized mode and needs to advertise a new flooding > > topology, it floods the new flooding topology on both the new and old > > flooding topologies. > > > > If the Area Leader operates in distributed mode, it MUST advertise a > > non-zero algorithm in its Area Leader Sub-TLV. > > > > When the Area Leader advertises algorithm 0 in its Area Leader Sub- > > TLV and does not advertise a flooding topology, Dynamic Flooding is > > disabled for the area. Note this applies whether the Area Leader > > intends to operate in centralized mode or in distributed mode. > > > > Note that once Dynamic Flooding is enabled, disabling it risks > > destabilizing the network. > > > > *6.5 . Distributed Flooding Topology Calculation* > > > > If the Area Leader advertises a non-zero algorithm in its Area Leader > > Sub-TLV, all nodes in the area that support Dynamic Flooding and the > > value of algorithm advertised by the Area Leader MUST compute the > > flooding topology based on the Area Leader's advertised algorithm. > > > > Nodes that do not support the value of algorithm advertised by the > > Area Leader MUST continue to use standard flooding mechanism as > > defined by the protocol. > > > > Nodes that do not support the value of algorithm advertised by the > > Area Leader MUST be considered as Dynamic Flooding incapable nodes by > > the Area Leader. > > > > If the value of the algorithm advertised by the Area Leader is from > > the range 128-254 (private distributed algorithms), it is the responsi= bility of the > > network operator to guarantee that all nodes in the area have a common un= derstanding of what the given algorithm value represents. > > > > Former =3D WG LC > > https://datatracker.ietf.org/doc/html/draft-cc-lsr-flooding-reduction-08 > > > > > Provides algorithm for distributed mode for this draft as well as the > algorithm to be used for distributed mode later dynamic flooding draft > > > > Separate question- > > > > In light of the flooding algorithm and seeing that at the bottom of > section 6.5 mentions flooding algorithm are the IANA codepoints reserved > for flooding unique and non overlapping with the flex algo codepoints I > believe 0-127. I would think the flooding algorithm range of values is > completely separate since a different function then flex algo values. > > > > https://datatracker.ietf.org/doc/html/draft-ietf-lsr-flex-algo-07 > > > > > > > Best Regards, > > Huaimo > ------------------------------ > > *From:* Gyan Mishra > *Sent:* Thursday, May 21, 2020 10:36 AM > > > *To:* Huaimo Chen > *Cc:* Acee Lindem (acee) ; lsr@ietf.or= g < > lsr@ietf.org> > *Subject:* Re: [Lsr] Flooding Topology Computation Algorithm - > draft-cc-lsr-flooding-reduction-08 Working Group Adoption Call > > > > > > > > On Wed, May 20, 2020 at 11:59 PM Huaimo Chen > wrote: > > Hi Gyan, > > > > Thanks much for your questions. My answers are inline below with [HC]= . > > > > Best Regards, > > Huaimo > ------------------------------ > > *From:* Gyan Mishra > *Sent:* Wednesday, May 20, 2020 11:14 AM > *To:* Huaimo Chen > *Cc:* Acee Lindem (acee) ; lsr@ietf.or= g < > lsr@ietf.org> > *Subject:* Re: [Lsr] Flooding Topology Computation Algorithm - > draft-cc-lsr-flooding-reduction-08 Working Group Adoption Call > > > > Huaimo > > > > This is a much needed feature that operators have been needing for densel= y > meshed topologies that commonly exist in data centers to accommodate very > high bandwidth E-W traffic. > > [HC]: Thank you very much. > > > > Below is link from Cisco which has introduced feature for dynamic floodin= g > in clos high density ECMP data center topologies. > > > > Please look at the feature description and it does seem to be exactly the > same as this draft. Please confirm. > > [HC]: It seems different. > > > > There maybe other vendors due to industry demand have to get the feature > deployed before it reaches standards vendor consensus with the IETF. > > > > > https://www.cisco.com/c/en/us/products/collateral/switches/nexus-9000-ser= ies-switches/white-paper-c11-743015.html > > > > > We are testing this feature and planning to deploy but wanted to ensure > that this is the same as the draft on the standards track. > > [HC]: The feature appears implemented draft "Dynamic Flooding on Dense > Graphs", which does not include any flooding topology computation > algorithm.. > > > > Gyan> How does this draft compare to the WG LC draft for flood > reduction. Would they be two eventual standard options in the operators > toolbox or competing features for optimized flood reduction. Would havin= g > two flood reduction features standardized versus one default IGP flood > reduction feature be confusing for operators. Just as it was confusing t= o > me. > > > > > > https://datatracker.ietf.org/doc/draft-ietf-lsr-dynamic-flooding/ > > > > > Kind regards > > > > Gyan > > > > > > On Tue, May 19, 2020 at 11:52 PM Huaimo Chen > wrote: > > Hi Gyan, > > > > Thank you very much for your questions and support. > > > > This Flooding Topology Computation algorithm can be used in the > Dynamic Flooding on Dense Graphs to compute the flooding topologies for > the data center clos dense meshed topologies with many ECMP paths. It can > be used by the area leader in the centralized mode to compute the floodin= g > topology. > > > > Best Regards, > > Huaimo > ------------------------------ > > *From:* Lsr on behalf of Gyan Mishra < > hayabusagsm@gmail.com> > *Sent:* Tuesday, May 19, 2020 2:39 AM > *To:* Yanhe Fan > *Cc:* lsr@ietf.org ; Acee Lindem (acee) 40cisco.com@dmarc.ietf.org> > *Subject:* Re: [Lsr] Flooding Topology Computation Algorithm - > draft-cc-lsr-flooding-reduction-08 Working Group Adoption Call > > > > > > I support WG adoption and have a few questions related to the draft. > > > > Does this flooding algorithm use the dynamic flooding algorithm used in > data center clos dense meshed topologies with many ECMP paths where the > flood is decoupled from the physical topology. In the dynamic flooding > algorithm mentioned in centralized mode the flooding is computed by the > area leader and distributed to all nodes. In distributed mode each mode > the area leader determines the algorithm and then each node computes the > flooding topology based on the algorithm. > > > > This dynamic algorithm for optimized flood reduction would reduce the > amount of redundant flooding in highly densely meshed ospf or Isis > topologies. So this optimization of flooding would improving overall lin= k > state routing protocol convergence. > > > > Gyan > > > > On Mon, May 18, 2020 at 3:37 PM Yanhe Fan wrote: > > Support it as a co-author. > > > > Thanks, > > Yanhe > > > > *From:* Lsr *On Behalf Of *Acee Lindem (acee) > *Sent:* Friday, May 15, 2020 3:40 PM > *To:* lsr@ietf.org > *Subject:* [Lsr] Flooding Topology Computation Algorithm - > draft-cc-lsr-flooding-reduction-08 Working Group Adoption Call > > > > This begins a 3 week (due to holidays) WG adoption call for the =E2=80=9C= Flooding > Topology Computation Algorithm=E2=80=9D draft. Please issue your support = or > objection to this list by 11:59 PM, UTC on June 5th, 2020. Here is a URL > for your convenience. > > > > https://datatracker.ietf.org/doc/draft-cc-lsr-flooding-reduction/ > > > > > Thanks, > Acee > > _______________________________________________ > Lsr mailing list > Lsr@ietf.org > https://www.ietf.org/mailman/listinfo/lsr > > > -- > > *Error! Filename not specified.* > > > *Gyan > Mishra* > > > *Network > Solutions Architect * > > > > > > *M 301 502-1347 13101 Columbia Pike > > *Silver Spring, MD > > > > > -- > > *Error! Filename not specified.* > > > *Gyan Mishra* > > *Network Solutions Architect * > > > > *M 301 502-1347 > 13101 > Columbia Pike > > *Silver Spring, MD > > > > > > > -- > > *Error! Filename not specified.* > > > *Gyan Mishra* > > *Network Solutions Architect * > > > > *M 301 502-1347 13101 Columbia Pike > > *Silver Spring, MD > > > > > > > > > -- > > *Error! Filename not specified.* > > > *Gyan Mishra* > > *Network Solutions Architect * > > > > *M 301 502-1347 13101 Columbia Pike > > *Silver Spring, MD > > > > > > > > > -- > > [image: Image removed by sender.] > > > *Gyan Mishra* > > *Network Solutions Architect * > > > > *M 301 502-1347 13101 Columbia Pike > > *Silver Spring, MD > > > > > > > > > -- > > > > > *Gyan Mishra* > > *Network Solutions A**rchitect * > > > > *M 301 502-1347 13101 Columbia Pike > > *Silver Spring, MD > > > > > --=20 *Gyan Mishra* *Network Solutions A**rchitect * *M 301 502-134713101 Columbia Pike *Silver Spring, MD --000000000000d80d2505a6460281 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hi Huaimo

Thank you for the slide deck.=C2=A0 That really helps unders= tand the algorithm. =C2=A0

I will let you=C2=A0know if I have any questions.

The goal of the algorithm is to speed up conve= rgence by limiting the convergence scope and expanding out 1 link at a time= until all nodes and links are part of the flood scope.=C2=A0 From the exam= ples in the slide deck I did not see mentioned what is done with the dynami= c flooding algorithm where when you have a meshed network in the slide 5 ex= amples, how do you limit the flooding on redundant links duplicate flooding= with the many meshed paths as you iteratively grow the FT nodes scope Cq()= .=C2=A0 I believe with the dynamic flooding it does a degree of 2 so 2 link= s between nodes. =C2=A0

= I think with clos spine leaf the mesh is much more intensive and problemati= c with ECMP then a circular topology nodal mesh that results in duplicate r= edundant flooding that slows down convergence.=C2=A0 With spine leaf it=E2= =80=99s like an X horizontal width axis and then depth is spine to leaf lin= ks.=C2=A0 With spine leaf as you grow sideways and the spine expand the red= undant ECMP grows and redundant flooding grows exponentially and is much wo= rse then circular nodal mesh. =C2=A0

Thank you=C2=A0

Gyan

On Fri, May 22, 2020 at 10:05 AM Huaimo Chen <huaimo.chen@futurewei.com> wrote:=
Hi Gyan,

=C2=A0 =C2=A0 Thanks much for your questions. My answers/explanations are i= nline below.

Best Regards,
Huaimo
From: Gyan= Mishra <hayabusagsm@gmail.com>
Sent: Thursday, May 21, 202= 0 10:13 PM
To: Acee Lindem (acee) <= acee@cisco.com>
Cc: Huaimo Chen <huaimo.chen@futurewei.com>; ls= r@ietf.org <lsr@ietf.org>
Subject: Re: [Lsr] Flooding= Topology Computation Algorithm - draft-cc-lsr-flooding-reduction-08 Workin= g Group Adoption Call
=C2=A0

I think for both drafts it would be good to have a stick = diagram at a minimum. =C2=A0
[HC]: A diagram for illustrating the steps of the algorit= hm is in Appendix.
I majored in EE with math =C2=A0minor and both drafts are= hard to follow without a diagram with labels showing the exact topology ex= amples. =C2=A0

Four main topologies - full mesh, partial mesh and leaf s= pine ( 2 tier) and CLOS ( 3 tier) - real world scenario=E2=80=99s.

From the interim meeting was their a slide deck visual to= pology shared?=C2=A0
[HC]: The set of slides presented in IETF 105 is attached= .

That would help.

4.1=C2=A0

Step 1 - Build Cq candidate queue=C2=A0

For each node B on FT whose D is one (from minimum to maximum
       node ID), find a link L attached to B such that L's remote node =
R
       has minimum D and ID, add link L between B and R into FT and
       increase B's D and R's D by one.  Return FT.
My interpretation is the algorithm an iterative loop and = starts with any node in the candidate list so could start from edge and wor= k left to right or vice versa.=C2=A0 For loop to build FT from Cq =3D with = each node B with directly attached node R via link L.=C2=A0 Increment node B from Cq until the FT is build for all n= odes.=C2=A0 Instead of starting with a wide diameter FT matching physical t= opology we start micro topology with D=3D1 and go node by node.
[HC]: This (For each node B on FT .... Return FT.) is=C2= =A0an iterative loop after every node is added to FT. This loop connects each no= de whose D =3D 1 (i.e., there is only one link attached to it on FT) to a n= ode through a link on FT (i.e., add the link to FT) to make every node on F= T to have its D > 1. Page 5 of the attached slides shows some details for this loop.

4.2=C2=A0

1.  Finding and removing the first element with node A in Cq that is
       not on FT and one PH's D in PHs < MaxD and PH's D < PH=
's ConMaxD.

       If A is root R0, then add the element into FT

       otherwise  (i.e., A !=3D R0 with one PH's D in PHs < MaxD and=
 PH's
          D < PH's ConMaxD.  Assume that PH is the first one in PHs
          whose D < MaxD and PH's D < PH's ConMaxD), PH's=
 D++, and add A
          with D =3D 1 and PHs =3D {PH} into FT.

       Note:  if there is no element with a node in Cq satisfying the
          conditions, then algorithm may be restarted from R0, ++MaxD,
          Cq =3D {(R0,D=3D0,PHs =3D { })}, FT =3D { };
This is similar to 4.1 with micro topology with 2 directl= y connected nodes=C2=A0
[HC]: It is similar to 1. in section 4.1.

My interpretation of the algorithm from the verbiage.

So this draft starts in the middle of the topology and is= geared towards leaf spine 2 or 3 tier clos topology.

For this one we build the bi graph so that could be leaf = connected to two spines or spine connected to two leafs and iteratively bui= ld out the FT topology 3 node arch =C2=A0spine leaf spine or leaf spine lea= f.

Kind regards=C2=A0

Gyan

On Thu, May 21, 2020 at 7:01 PM Acee Lindem (acee) <acee@cisco.com> wro= te:

Hi Gyan,

=C2=A0

From: Gyan Mishra <hayabusagsm@gmail.com= >
Date: Thursday, May 21, 2020 at 4:20 PM
To: Acee Lindem <acee@cisco.com>
Cc: Huaimo Chen <huaimo.chen@futurewei.com>, "lsr@ietf.org" <lsr@ietf.org>
Subject: Re: [Lsr] Flooding Topology Computation Algorithm - draft-c= c-lsr-flooding-reduction-08 Working Group Adoption Call

=C2=A0

=C2=A0

Yes and I have started reviewing the LSR mai= l archives as I am late in the discussion for this.

=C2=A0

If you have link to any particular dates in = the archives would be helpful.

=C2=A0

No =E2=80=93 it was more an =E2=80=9Cevolution=E2=80=9D than an =E2=80= =9Cepiphany=E2=80=9D.

=C2=A0

That sums up all the questions I have so if = all answered in the archives then I am all set.

=C2=A0

I support the draft moving forward as flood = reduction is a much needed feature. =C2=A0

=C2=A0

I think overall both drafts will really help= large data centers with any overlay underlay vxlan spine leaf meshed CLOS = highly meshed topology that scales out horizontally with a large spine foot= print - this is a much much needed feature.=C2=A0 This also helps eliminate complexity of = the workaround of using BGP in the underlay which to me adds tremendous com= plexity.

=C2=A0

Here is the other recently presented dynamic flooding draft.

=C2=A0

https://datatracker.ietf.org/doc/draft-chen-lsr-dyn= amic-flooding-algorithm/

=C2=A0

You can see they both make use of the dynamic flooding infra in https://datatracker.ietf.org/doc/draft-ietf-lsr-dynamic-flooding/

=C2=A0

Thanks,

Acee

=C2=A0

=C2=A0

=C2=A0

=C2=A0

Kind regards=C2=A0

=C2=A0

Gyan=C2=A0

=C2=A0

On Thu, May 21, 2020 at 4:07 PM Acee Lindem = (acee) <acee@cisco.c= om> wrote:

Speaking as WG Co-chair:

=C2=A0

Hi Gyan,

=C2=A0

I guess you=E2=80=99ve joined this discussio= n late. It might be a good idea to review the LSR mailing list archives.

=C2=A0

= From: Gyan Mishra <hayabusagsm@gmail.com= >
Date: Thursday, May 21, 2020 at 1:51 PM
To: Huaimo Chen <huaimo.chen@futurewei.com>
Cc: Acee Lindem <acee@cisco.com>, "lsr@ietf.org" <lsr@ietf.org>
Subject: Re: [Lsr] Flooding Topology Computation Algorithm - draft-c= c-lsr-flooding-reduction-08 Working Group Adoption Call

=C2=A0

=C2=A0

=C2=A0

On Thu, May 21, 2020 at 11:01 AM Huaimo Chen &= lt;huaimo.ch= en@futurewei.com> wrote:

Hi = Gyan,

=C2= =A0

=C2= =A0 =C2=A0 Thanks much for your questions.

=C2= =A0

=C2= =A0Gyan> How does this draft compare to the WG LC draft for flood reduct= ion.=C2=A0 Would they be two eventual standard options in the operators too= lbox =C2=A0or competing features for optimized flood reduction. Would having two flood reduction features s= tandardized versus one default IGP flood reduction feature be confusing for= operators.=C2=A0 Just as it was confusing to me.=C2=A0

=C2= =A0

=C2= =A0 =C2=A0 [HC]: This draft plus the draft for flooding reduction can provi= de two modes of flooding reductions (i.e., centralized mode and distributed= mode). The latter describes the two modes, but does not include any flooding topology computation algo= rithm for the distributed mode. The former proposes a=C2=A0flooding topology computation algorithm to be used i= n the distributed mode.=C2=A0=C2=A0

=C2=A0

=C2=A0 =C2=A0Gyan> It maybe a good idea for= both documents to reference each other as to how they play together or =C2= =A0in some respects if any provide a homogeneous complete holistic solution= for flooding problem being solved. =C2=A0

=C2=A0

It is a good idea to have this new draft ref= erence the dynamic-flooding but not vice-versa. The existing dynamic floodi= ng draft provides a framework for any dynamic flooding algorithm that provi= des a separate flooding topology. This algorithm is just the first to be formally propose= d in a draft. Note that another algorithm was presented during the LSR virt= ual interim which replaced IETF 107. =C2=A0

=C2=A0

In my opinion it may not be a bad idea even to= combine both drafts so the solution is complete and holistic.=C2=A0 This w= ill also make the overall specification flow nicely. =C2=A0

=C2=A0

No =E2=80=93 we=E2=80=99re not going to do t= his.

=C2=A0

Thanks,

Acee

=C2=A0

I know that efforts were made by LSR to have a= common IGP solution, however there are many inherent differences between I= SIS and OSPF that from IGP Link state protocol perspective you can treat li= ke apples to apples but really it=E2=80=99s apples and oranges.=C2=A0 Maybe it might we wise t= o have separate draft for both and have references linking together as the = same algorithm concept and mathematically however the actual code implement= ation would vary as the LSDB link state data structures are completely different.=C2=A0

=C2=A0

Later =3D Dynamic flooding =3D 2 modes Central= ized leader based and distributed=C2=A0

=C2=A0

This later draft per section excerpt provides = both centralized and distributed algorithm see below=C2=A0

=C2=A0

6.4.=C2=A0 Area Leader Responsibilities
=C2=A0
=C2=A0=C2=A0 If the Area Leader operates in central=
ized mode, it MUST advertise<=
u style=3D"font-family:monospace">
=C2=A0=C2=A0 algorithm 0 in its Area Leader Sub-TLV=
.=C2=A0 In order for Dynamic<=
u style=3D"font-family:monospace">
=C2=A0=C2=A0 Flooding to be enabled it also MUST co=
mpute and advertise a flooding
=C2=A0=C2=A0 topology for the area.=C2=A0 The Area =
Leader may update the flooding
=C2=A0=C2=A0 topology at any time, however, it shou=
ld not destabilize the network
=C2=A0=C2=A0 with undue or overly frequent topology=
 changes.=C2=A0 If the Area Leader
=C2=A0=C2=A0 operates in centralized mode and needs=
 to advertise a new flooding<=
u style=3D"font-family:monospace">
=C2=A0=C2=A0 topology, it floods the new flooding t=
opology on both the new and old
=C2=A0=C2=A0 flooding topologies.
=C2=A0
=C2=A0=C2=A0 If the Area Leader operates in distrib=
uted mode, it MUST advertise a
=C2=A0=C2=A0 non-zero algorithm in its Area Leader =
Sub-TLV.
=C2=A0
=C2=A0=C2=A0 When the Area Leader advertises algori=
thm 0 in its Area Leader Sub-=

=C2=A0=C2=A0 TLV and does not advertise a flooding =
topology, Dynamic Flooding is=

=C2=A0=C2=A0 disabled for the area.=C2=A0 Note this=
 applies whether the Area Leader<=
/u>
=C2=A0=C2=A0 intends to operate in centralized mode=
 or in distributed mode.
=C2=A0
=C2=A0=C2=A0 Note that once Dynamic Flooding is ena=
bled, disabling it risks
=C2=A0=C2=A0 destabilizing the network.

=C2=A0


6.5.=C2=A0 Distributed Flooding Topology Calculation


=C2=A0


=C2=A0=C2=A0 If the Area Leader advertises a non-ze=
ro algorithm in its Area Leader


=C2=A0=C2=A0 Sub-TLV, all nodes in the area that su=
pport Dynamic Flooding and the


=C2=A0=C2=A0 value of algorithm advertised by the A=
rea Leader MUST compute the


=C2=A0=C2=A0 flooding topology based on the Area Le=
ader's advertised algorithm.<=
/u>


=C2=A0


=C2=A0=C2=A0 Nodes that do not support the value of=
 algorithm advertised by the<=
u style=3D"font-family:monospace">


=C2=A0=C2=A0 Area Leader MUST continue to use stand=
ard flooding mechanism as


=C2=A0=C2=A0 defined by the protocol.

=C2=A0


=C2=A0=C2=A0 Nodes that do not support the value of=
 algorithm advertised by the<=
u style=3D"font-family:monospace">


=C2=A0=C2=A0 Area Leader MUST be considered as Dyna=
mic Flooding incapable nodes by


=C2=A0=C2=A0 the Area Leader.


=C2=A0


=C2=A0=C2=A0 If the value of the algorithm advertis=
ed by the Area Leader is from=



=C2=A0=C2=A0 the range 128-254 (private distributed=
 algorithms), it is the responsibility of the=C2=A0


network operator to guarante=
e that all nodes in the area have a common understanding of what the given =
algorithm value represents.


=C2=A0

Former =3D WG LC=C2=A0

Provides algorithm for distributed mode for th= is draft as well as the algorithm to be used for distributed mode later dyn= amic flooding draft=C2=A0

=C2=A0

Separate question-

=C2=A0

In light of the flooding algorithm and seeing = that at the bottom of section 6.5 mentions flooding algorithm are the IANA = codepoints reserved for flooding unique and non overlapping with the flex a= lgo codepoints I believe 0-127.=C2=A0 I would think the flooding algorithm range of value= s is completely separate since a different function then flex algo values.<= u>

=C2=A0

=C2= =A0

Bes= t Regards,

Hua= imo

From: Gyan Mishra <hayabusagsm@gmail.com>
Sent: Thursday, May 21, 2020 10:36 AM


To: Huaimo Chen <huaimo.chen@futurewei.com>
Cc: Acee Lindem (acee) <acee=3D40cisco.com@dmarc.ietf.org>; lsr@ietf.org <lsr@ietf.org>
Subject: Re: [Lsr] Flooding Topology Computation Algorithm - draft-c= c-lsr-flooding-reduction-08 Working Group Adoption Call

=C2=A0

=C2=A0

=C2=A0

On Wed, May 20, 2020 at 11:59 PM Huaimo Chen &= lt;huaimo.ch= en@futurewei.com> wrote:

Hi = Gyan,

=C2= =A0

=C2= =A0 =C2=A0 Thanks much for your questions. My answers are inline below with= [HC].

=C2= =A0

Bes= t Regards,

Hua= imo

From: Gyan Mishra <hayabusagsm@gmail.com>
Sent: Wednesday, May 20, 2020 11:14 AM
To: Huaimo Chen <huaimo.chen@futurewei.com>
Cc: Acee Lindem (acee) <acee=3D40cisco.com@dmarc.ietf.org>; lsr@ietf.org <lsr@ietf.org>
Subject: Re: [Lsr] Flooding Topology Computation Algorithm - draft-c= c-lsr-flooding-reduction-08 Working Group Adoption Call

=C2=A0

Huaimo=C2=A0

=C2=A0

This is a much needed feature that operators h= ave been needing for densely meshed topologies that commonly exist in data = centers to accommodate very high bandwidth E-W traffic.

[HC]: Thank you very much.

=C2=A0

Below is link from Cisco which has introduced = feature for dynamic flooding in clos high density ECMP data center topologi= es.

=C2=A0

Please look at the feature description and it = does seem to be exactly the same as this draft.=C2=A0 Please confirm.=C2=A0=

[HC]: It seems different.=C2=A0<= /p>

=C2=A0

There maybe other vendors due to industry dema= nd have to get the feature deployed before it reaches standards vendor cons= ensus with the IETF.

=C2=A0

=C2=A0

We are testing this feature and planning to de= ploy but wanted to ensure that this is the same as the draft on the standar= ds track.

[HC]: The feature appears implemented draft "Dynamic Flooding on Dense Graph= s", which does not include any flooding topology computation algorithm= ..=C2=A0

=C2=A0

=C2=A0 =C2=A0 Gyan> How does this draft com= pare to the WG LC draft for flood reduction.=C2=A0 Would they be two eventu= al standard options in the operators toolbox =C2=A0or competing features fo= r optimized flood reduction. Would having two flood reduction features standardized versus one default IGP flood red= uction feature be confusing for operators.=C2=A0 Just as it was confusing t= o me.

=C2=A0

=C2=A0

Kind regards=C2=A0

=C2=A0

Gyan

=C2=A0

=C2=A0

On Tue, May 19, 2020 at 11:52 PM Huaimo Chen &= lt;huaimo.ch= en@futurewei.com> wrote:

Hi Gyan,

=C2= =A0

=C2=A0 =C2=A0 Thank you very much for your questi= ons and support.

=C2= =A0

=C2=A0 =C2=A0 This Flooding Topology Computation algorithm can be used in the Dynamic Flooding on Dense Graphs = to compute the flooding topologies for the=C2=A0data center clos dense mesh= ed topologies with many ECMP paths. It can be used by the area leader in th= e centralized mode to compute the flooding topology. =C2=A0=C2=A0

=C2=A0

Best Regards,

Huaimo

From: Lsr <lsr-bounces@ietf.org> on behalf of Gyan Mishra = <hayabusagsm@= gmail.com>
Sent: Tuesday, May 19, 2020 2:39 AM
To: Yanhe Fan <yfan@casa-systems.com>
Cc: lsr@ietf.org <lsr@ietf.org&g= t;; Acee Lindem (acee) <acee=3D40cisco.com@dmarc.ietf.org>
Subject: Re: [Lsr] Flooding Topology Computation Algorithm - draft-c= c-lsr-flooding-reduction-08 Working Group Adoption Call

=C2=A0

=C2=A0

I support WG adoption and have a few questions= related to the draft.

=C2=A0

Does this flooding algorithm use the dynamic f= looding algorithm used in data center clos dense meshed topologies with man= y ECMP paths where the flood is decoupled from the physical topology.=C2=A0= In the dynamic flooding algorithm mentioned in centralized mode the flooding is computed by the ar= ea leader and distributed to all nodes.=C2=A0 In distributed mode each mode= the area leader determines the algorithm and then each node computes the f= looding topology based on the algorithm. =C2=A0

=C2=A0

This dynamic algorithm for optimized flood red= uction would reduce the amount of redundant flooding in highly densely mesh= ed ospf or Isis topologies.=C2=A0 So this optimization of flooding would im= proving overall link state routing protocol convergence.

=C2=A0

Gyan=C2=A0

=C2=A0

On Mon, May 18, 2020 at 3:37 PM Yanhe Fan <= yfan@casa-system= s.com> wrote:

Support it as a co-author.

=C2=A0

Thanks,

Yanhe

______________________________________________= _
Lsr mailing list
Lsr@ietf.org
https://www.i= etf.org/mailman/listinfo/lsr

--

Error! Filename not specified.

Gyan Mishra

Network Solutions Architect=C2=A0

M 301 502-1347
13101 Columbia Pike=C2=A0
Silver Spring, MD

=C2=A0

--

Error! Filename not specified.

Gyan Mishra

Network Solutions Archit= ect=C2=A0

M 301 502-1347
13101 Columbia Pike=C2=A0
Silver Spring, MD

=C2=A0

--

--


Gyan M= ishra

Network Solutions Architect=C2=A0

M 301 502-1347
13101 Columbia Pike=C2=A0
Silver Spring, MD<= /a>


--
--000000000000d80d2505a6460281-- From nobody Fri May 22 18:02:20 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id A32C13A0E7C for ; Fri, 22 May 2020 18:02:19 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.5 X-Spam-Level: X-Spam-Status: No, score=-1.5 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FORGED_FROMDOMAIN=0.249, FREEMAIL_FROM=0.001, HEADER_FROM_DIFFERENT_DOMAINS=0.249, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001] autolearn=no autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Zwgp6QSNpaDR for ; Fri, 22 May 2020 18:02:17 -0700 (PDT) Received: from mail-pg1-x52f.google.com (mail-pg1-x52f.google.com [IPv6:2607:f8b0:4864:20::52f]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 93D4A3A0E81 for ; Fri, 22 May 2020 18:02:17 -0700 (PDT) Received: by mail-pg1-x52f.google.com with SMTP id j21so5777342pgb.7 for ; Fri, 22 May 2020 18:02:17 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=sender:from:message-id:mime-version:subject:date:in-reply-to:cc:to :references; bh=knwraGd8vqkDHJFfiEryDh2vYQHwLWo8rL7i9yZ+oiw=; b=rznWSbhUroC5H4JSi1pGgmNjEeZd4ATjM+zbfnA/NmXCHxodZRJEnQGq1jUGp5IKjT yah5Y/YltwjyHoR3zeMDuzz7t5JnxctFbvJhlY+LDKEh48k0Y8TD89ZtcBSs7UClU7TR y9Rydzo4pxcEeVc84oT0hd63nb06SuWpPcyU0UNHSZZsd37GNqgdOg42YBiXCzRGnzEd Eh4q+jgj0NetBJ39VrXTZ1swTTjqAdJ4CVAQGax15kMUbLSUYx+IexYe5DWNPh05Y9pf lWY1WJNLGvIooWQFMH7ZbL9y4G/MSLe1QVD5FWf1/TCcOIMB486/LSRs/s9IGqTQYkQO R8jw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:from:message-id:mime-version:subject:date :in-reply-to:cc:to:references; bh=knwraGd8vqkDHJFfiEryDh2vYQHwLWo8rL7i9yZ+oiw=; b=QgIyMJMHEgNXmA/98nzxSJMH0qe9/TQ9xSMSa6lsN2g8N+KGBrF9v+j6NFDzajPNuO d24aXK/RhnhtyBX2La4gKOR7W4JCyq0GPssTQ7gf9S9cuvs4nNy42T9FkSvO3F8wkFXs fbUgWOoMZepGkChiwprnCqsP3rs7uTNNJ0ftEc9MyPxlpn9mVNRMGlN7MXs2enrLTydy 4DisHtDEktRxNK5z5O7c06CbgH6203sGt0Ap9WbwlbJlqn8hZW4KeDYyBsDZQ5tDT5O3 l34jdcQkSj8lw5210nSy5z/sO0BEEjHJYr9OehdfwnSd8CBLjl3nJOIlN5E46Ng/TaMJ 83rg== X-Gm-Message-State: AOAM5313bNYcJhvVUmMTofE9Hu9uw1tEnajz45tYz0xm4twJPnNM9pph wWrpUAPhqobYlu3TxfgB6iA= X-Google-Smtp-Source: ABdhPJwzEzagZWgKhEuuiDU/+E0q6U8lv2zM4IXwlalFtQyjzoCP6udiZMHVkDqtaPWYbyTXZbflow== X-Received: by 2002:a62:b402:: with SMTP id h2mr6581138pfn.221.1590195736277; Fri, 22 May 2020 18:02:16 -0700 (PDT) Received: from [10.95.93.131] ([162.210.129.5]) by smtp.gmail.com with ESMTPSA id z18sm7879794pfj.148.2020.05.22.18.02.14 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Fri, 22 May 2020 18:02:15 -0700 (PDT) Sender: Tony Li From: tony.li@tony.li Message-Id: <331DE9C9-BF8A-483D-B4D5-366D3FBF4C22@tony.li> Content-Type: multipart/alternative; boundary="Apple-Mail=_E55AD659-D2FD-41E9-A9B2-45FA5ED1E894" Mime-Version: 1.0 (Mac OS X Mail 13.4 \(3608.80.23.2.2\)) Date: Fri, 22 May 2020 18:02:13 -0700 In-Reply-To: Cc: Huaimo Chen , "lsr@ietf.org" , "Acee Lindem (acee)" To: Gyan Mishra References: <63330FD6-EDE8-4938-AA85-948279C57E34@cisco.com> <424B17B1-D66D-4708-A819-855E972841AF@cisco.com> X-Mailer: Apple Mail (2.3608.80.23.2.2) Archived-At: Subject: Re: [Lsr] Flooding Topology Computation Algorithm - draft-cc-lsr-flooding-reduction-08 Working Group Adoption Call X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 23 May 2020 01:02:20 -0000 --Apple-Mail=_E55AD659-D2FD-41E9-A9B2-45FA5ED1E894 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=utf-8 Hi Gyan, > I think with clos spine leaf the mesh is much more intensive and = problematic with ECMP then a circular topology nodal mesh that results = in duplicate redundant flooding that slows down convergence. With spine = leaf it=E2=80=99s like an X horizontal width axis and then depth is = spine to leaf links. With spine leaf as you grow sideways and the spine = expand the redundant ECMP grows and redundant flooding grows = exponentially and is much worse then circular nodal mesh. =20 One very nice thing about dynamic flooding is that it computes a = flooding topology at the node level. If the adjacency between A and B = is on the flooding topology, then any single link between them may be = used for flooding. If you have 128 way parallel links, this is an = immediate 128x improvement in flooding overhead. What=E2=80=99s more, A = and B do not need to agree on which link they are using and can use = different links, resulting in an asymmetric situation, without any loss = of correctness or performance.=20 Regards, Tony --Apple-Mail=_E55AD659-D2FD-41E9-A9B2-45FA5ED1E894 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=utf-8

Hi Gyan,

I think with clos spine leaf the mesh = is much more intensive and problematic with ECMP then a circular = topology nodal mesh that results in duplicate redundant flooding that = slows down convergence.  With spine leaf it=E2=80=99s like an X = horizontal width axis and then depth is spine to leaf links.  With = spine leaf as you grow sideways and the spine expand the redundant ECMP = grows and redundant flooding grows exponentially and is much worse then = circular nodal mesh.  

One very nice thing about dynamic flooding is that = it computes a flooding topology at the node level.  If the = adjacency between A and B is on the flooding topology, then any single = link between them may be used for flooding.  If you have 128 way = parallel links, this is an immediate 128x improvement in flooding = overhead.  What=E2=80=99s more, A and B do not need to agree on = which link they are using and can use different links, resulting in an = asymmetric situation, without any loss of correctness or = performance. 

Regards,
Tony

= --Apple-Mail=_E55AD659-D2FD-41E9-A9B2-45FA5ED1E894-- From nobody Fri May 22 18:12:17 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id B5F363A0D33 for ; Fri, 22 May 2020 18:12:13 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.086 X-Spam-Level: X-Spam-Status: No, score=-2.086 tagged_above=-999 required=5 tests=[AC_DIV_BONANZA=0.001, BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_REMOTE_IMAGE=0.01, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id psWnfBaEWN1S for ; Fri, 22 May 2020 18:12:08 -0700 (PDT) Received: from mail-io1-xd30.google.com (mail-io1-xd30.google.com [IPv6:2607:f8b0:4864:20::d30]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id EB7B93A0E85 for ; Fri, 22 May 2020 18:12:07 -0700 (PDT) Received: by mail-io1-xd30.google.com with SMTP id u23so379526iot.12 for ; Fri, 22 May 2020 18:12:07 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=M0AQRqlulTxZPzIwRNybD1HUbEuQe4zRqozlg7+NQC0=; b=cxYLwk+XNrMr6+WwFHh1HCifjuKAlDXVhgIIXBC+v4HDBIOxH6965a/mrsW2uxSaSv HTskqs6FqFkD/W4By9SLNNzg1wZI0KU4Htr3LaXR36mtDDhT/xqDQF2BLr8ZwNG8LtFU pBjOe7F77LPEdcHcvd3IEOKtQrhCeCYkv9G1dDd4hbvru/YC491Jk2hagEgfPxAs9xGZ 0pMJdEWOhdSJQzuEeN/z+0Wp1Za1xYvQd9MrGbQm7jMzk2e1qGHxXQIbFUo1U57NSMxC MOoQeAYfHOjYE0YLMNoHPhUGEWbOIjg1c/KdQzr328yqGhmBk4rxj4Idd8rQ5IgdFMNa fUdA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=M0AQRqlulTxZPzIwRNybD1HUbEuQe4zRqozlg7+NQC0=; b=jc2ZPbTTwRH6KrV6X6/fZdrUSJmHmJl/e8INgzGx+HO1dgMdYurxtlKEwdwiSDBkkp cahbEhdWmwGSJFvhHRM9kcIZqv9KmEmKqLqxTbcxR7sQfOHjKZXuLHq9yvn4+7UwVfvT IQTUZa3H5D9EAT5wk7Dm5Y5MjUs06D9VG1ibFJ6lrUT/i6pEYKq0ZEgx8M6KE3VZ3dkC kyUG/py28rJG/oClhfH1INb09pv9r1Apocj2ANi9qs3LkqX31jwToXTiLsB48nPDXvWy r+j5kzt7aOss4wd760eZBcQenBR5cqLugRnRayoa6SZWm2x04TvTky9jIE76CJma3Q8C g4Fw== X-Gm-Message-State: AOAM532x9jeFmEWn6Jb39VDLFshzBSRpKELEsWmoD1J/LE7aCEHCJUmB vTCScm+31yPMz5zoNpah5VqxRJkXOEWtHv3f8yg= X-Google-Smtp-Source: ABdhPJwJOIqTKnfkxu8ubA976R3z9qYL3hu/fy8lKvy2LKO4MzhSFgrhrJH61hiK7lF1RwnpBMAZvb2SKNda3ITv53U= X-Received: by 2002:a5e:cb4d:: with SMTP id h13mr5381264iok.141.1590196326851; Fri, 22 May 2020 18:12:06 -0700 (PDT) MIME-Version: 1.0 References: <63330FD6-EDE8-4938-AA85-948279C57E34@cisco.com> <424B17B1-D66D-4708-A819-855E972841AF@cisco.com> In-Reply-To: From: Gyan Mishra Date: Fri, 22 May 2020 21:11:44 -0400 Message-ID: To: Huaimo Chen Cc: "Acee Lindem (acee)" , "lsr@ietf.org" Content-Type: multipart/alternative; boundary="0000000000002f696005a6466f66" Archived-At: Subject: Re: [Lsr] Flooding Topology Computation Algorithm - draft-cc-lsr-flooding-reduction-08 Working Group Adoption Call X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 23 May 2020 01:12:14 -0000 --0000000000002f696005a6466f66 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hi Huaimo Thinking about physical topology a little further as with the FT algorithm it makes sense to decouple the FT from the physical however the overall coverage is based on those basic parameters of degree number of links and nodes as well as width and depth of the topology. Thinking about it further the clos leaf spine DC style topology is much worse in terms of flooding due to physical topology that leafs don=E2=80=99= t physical connection and are interconnected via the spine creating massive ECMP and overload of the spine super spine. So the physical DC leaf spine topology really exacerbates the flooding due to the non full mesh nature of the topology. With a service provider core which is typically a mesh style multi tier multiple concentric circles mix of full and partial mesh and hub spoke type physical topologies. So with flooding with full mesh every node connects with every node so you don=E2=80=99t have an overload of flooding being funneled through a super s= pine as you do with a leaf spine DC architecture. So in a full mesh which is the best case scenario for flooding perspective from my point of view which each node as root connects to all nodes and then you can iteratively grow the flooding scope and it=E2=80=99s pretty controlled and you can limit the redundant flooding. When the physical topology changes to a much more partially meshed the ECMP paths grow astronomically as does the flooding and longer convergence time. So I think in the slide deck and draft look at scenario where their is tremendous ECMP from partial meshing and how the flood reduction algorithm improves the flooding and convergence. Kind regards Gyan On Fri, May 22, 2020 at 8:41 PM Gyan Mishra wrote: > Hi Huaimo > > Thank you for the slide deck. That really helps understand the algorithm= . > > > I will let you know if I have any questions. > > The goal of the algorithm is to speed up convergence by limiting the > convergence scope and expanding out 1 link at a time until all nodes and > links are part of the flood scope. From the examples in the slide deck I > did not see mentioned what is done with the dynamic flooding algorithm > where when you have a meshed network in the slide 5 examples, how do you > limit the flooding on redundant links duplicate flooding with the many > meshed paths as you iteratively grow the FT nodes scope Cq(). I believe > with the dynamic flooding it does a degree of 2 so 2 links between nodes. > > I think with clos spine leaf the mesh is much more intensive and > problematic with ECMP then a circular topology nodal mesh that results in > duplicate redundant flooding that slows down convergence. With spine lea= f > it=E2=80=99s like an X horizontal width axis and then depth is spine to l= eaf > links. With spine leaf as you grow sideways and the spine expand the > redundant ECMP grows and redundant flooding grows exponentially and is mu= ch > worse then circular nodal mesh. > > Thank you > > Gyan > > On Fri, May 22, 2020 at 10:05 AM Huaimo Chen > wrote: > >> Hi Gyan, >> >> Thanks much for your questions. My answers/explanations are inline >> below. >> >> Best Regards, >> Huaimo >> ------------------------------ >> *From:* Gyan Mishra >> *Sent:* Thursday, May 21, 2020 10:13 PM >> *To:* Acee Lindem (acee) >> *Cc:* Huaimo Chen ; lsr@ietf.org > > >> *Subject:* Re: [Lsr] Flooding Topology Computation Algorithm - >> draft-cc-lsr-flooding-reduction-08 Working Group Adoption Call >> >> >> I think for both drafts it would be good to have a stick diagram at a >> minimum. >> [HC]: A diagram for illustrating the steps of the algorithm is in >> Appendix. >> I majored in EE with math minor and both drafts are hard to follow >> without a diagram with labels showing the exact topology examples. >> >> Four main topologies - full mesh, partial mesh and leaf spine ( 2 tier) >> and CLOS ( 3 tier) - real world scenario=E2=80=99s. >> >> From the interim meeting was their a slide deck visual topology shared? >> [HC]: The set of slides presented in IETF 105 is attached. >> >> That would help. >> >> https://datatracker.ietf.org/doc/html/draft-cc-lsr-flooding-reduction-08 >> >> >> 4.1 >> >> Step 1 - Build Cq candidate queue >> >> For each node B on FT whose D is one (from minimum to maximum >> node ID), find a link L attached to B such that L's remote node R >> has minimum D and ID, add link L between B and R into FT and >> increase B's D and R's D by one. Return FT. >> >> My interpretation is the algorithm an iterative loop and starts with any >> node in the candidate list so could start from edge and work left to rig= ht >> or vice versa. For loop to build FT from Cq =3D with each node B with >> directly attached node R via link L. Increment node B from Cq until the= FT >> is build for all nodes. Instead of starting with a wide diameter FT >> matching physical topology we start micro topology with D=3D1 and go nod= e by >> node. >> [HC]: This (For each node B on FT .... Return FT.) is an iterative loop >> after every node is added to FT. This loop connects each node whose D = =3D 1 >> (i.e., there is only one link attached to it on FT) to a node through a >> link on FT (i.e., add the link to FT) to make every node on FT to have i= ts >> D > 1. Page 5 of the attached slides shows some details for this loop. >> >> 4.2 >> >> 1. Finding and removing the first element with node A in Cq that is >> not on FT and one PH's D in PHs < MaxD and PH's D < PH's ConMaxD. >> >> If A is root R0, then add the element into FT >> >> otherwise (i.e., A !=3D R0 with one PH's D in PHs < MaxD and PH'= s >> D < PH's ConMaxD. Assume that PH is the first one in PHs >> whose D < MaxD and PH's D < PH's ConMaxD), PH's D++, and add A >> with D =3D 1 and PHs =3D {PH} into FT. >> >> Note: if there is no element with a node in Cq satisfying the >> conditions, then algorithm may be restarted from R0, ++MaxD, >> Cq =3D {(R0,D=3D0,PHs =3D { })}, FT =3D { }; >> >> This is similar to 4.1 with micro topology with 2 directly connected >> nodes >> [HC]: It is similar to 1. in section 4.1. >> >> https://www.ietf.org/id/draft-chen-lsr-dynamic-flooding-algorithm-00.htm= l >> >> >> My interpretation of the algorithm from the verbiage. >> >> So this draft starts in the middle of the topology and is geared towards >> leaf spine 2 or 3 tier clos topology. >> >> For this one we build the bi graph so that could be leaf connected to tw= o >> spines or spine connected to two leafs and iteratively build out the FT >> topology 3 node arch spine leaf spine or leaf spine leaf. >> >> Kind regards >> >> Gyan >> >> On Thu, May 21, 2020 at 7:01 PM Acee Lindem (acee) >> wrote: >> >> Hi Gyan, >> >> >> >> *From: *Gyan Mishra >> *Date: *Thursday, May 21, 2020 at 4:20 PM >> *To: *Acee Lindem >> *Cc: *Huaimo Chen , "lsr@ietf.org" < >> lsr@ietf.org> >> *Subject: *Re: [Lsr] Flooding Topology Computation Algorithm - >> draft-cc-lsr-flooding-reduction-08 Working Group Adoption Call >> >> >> >> >> >> Yes and I have started reviewing the LSR mail archives as I am late in >> the discussion for this. >> >> >> >> If you have link to any particular dates in the archives would be helpfu= l. >> >> >> >> No =E2=80=93 it was more an =E2=80=9Cevolution=E2=80=9D than an =E2=80= =9Cepiphany=E2=80=9D. >> >> >> >> That sums up all the questions I have so if all answered in the archives >> then I am all set. >> >> >> >> I support the draft moving forward as flood reduction is a much needed >> feature. >> >> >> >> I think overall both drafts will really help large data centers with any >> overlay underlay vxlan spine leaf meshed CLOS highly meshed topology tha= t >> scales out horizontally with a large spine footprint - this is a much mu= ch >> needed feature. This also helps eliminate complexity of the workaround = of >> using BGP in the underlay which to me adds tremendous complexity. >> >> >> >> Here is the other recently presented dynamic flooding draft. >> >> >> >> >> https://datatracker.ietf.org/doc/draft-chen-lsr-dynamic-flooding-algorit= hm/ >> >> >> >> >> You can see they both make use of the dynamic flooding infra in >> https://datatracker.ietf.org/doc/draft-ietf-lsr-dynamic-flooding/ >> >> >> >> >> Thanks, >> >> Acee >> >> >> >> >> >> >> >> >> >> Kind regards >> >> >> >> Gyan >> >> >> >> On Thu, May 21, 2020 at 4:07 PM Acee Lindem (acee) >> wrote: >> >> Speaking as WG Co-chair: >> >> >> >> Hi Gyan, >> >> >> >> I guess you=E2=80=99ve joined this discussion late. It might be a good i= dea to >> review the LSR mailing list archives. >> >> >> >> *From: *Gyan Mishra >> *Date: *Thursday, May 21, 2020 at 1:51 PM >> *To: *Huaimo Chen >> *Cc: *Acee Lindem , "lsr@ietf.org" >> *Subject: *Re: [Lsr] Flooding Topology Computation Algorithm - >> draft-cc-lsr-flooding-reduction-08 Working Group Adoption Call >> >> >> >> >> >> >> >> On Thu, May 21, 2020 at 11:01 AM Huaimo Chen >> wrote: >> >> Hi Gyan, >> >> >> >> Thanks much for your questions. >> >> >> >> Gyan> How does this draft compare to the WG LC draft for flood >> reduction. Would they be two eventual standard options in the operators >> toolbox or competing features for optimized flood reduction. Would havi= ng >> two flood reduction features standardized versus one default IGP flood >> reduction feature be confusing for operators. Just as it was confusing = to >> me. >> >> https://datatracker.ietf.org/doc/draft-ietf-lsr-dynamic-flooding/ >> >> >> >> >> [HC]: This draft plus the draft for flooding reduction can provide >> two modes of flooding reductions (i.e., centralized mode and distributed >> mode). The latter describes the two modes, but does not include any >> flooding topology computation algorithm for the distributed mode. The >> former proposes a flooding topology computation algorithm to be used in >> the distributed mode. >> >> >> >> Gyan> It maybe a good idea for both documents to reference each other >> as to how they play together or in some respects if any provide a >> homogeneous complete holistic solution for flooding problem being solved= . >> >> >> >> It is a good idea to have this new draft reference the dynamic-flooding >> but not vice-versa. The existing dynamic flooding draft provides a >> framework for any dynamic flooding algorithm that provides a separate >> flooding topology. This algorithm is just the first to be formally propo= sed >> in a draft. Note that another algorithm was presented during the LSR >> virtual interim which replaced IETF 107. >> >> >> >> In my opinion it may not be a bad idea even to combine both drafts so th= e >> solution is complete and holistic. This will also make the overall >> specification flow nicely. >> >> >> >> No =E2=80=93 we=E2=80=99re not going to do this. >> >> >> >> Thanks, >> >> Acee >> >> >> >> I know that efforts were made by LSR to have a common IGP solution, >> however there are many inherent differences between ISIS and OSPF that f= rom >> IGP Link state protocol perspective you can treat like apples to apples = but >> really it=E2=80=99s apples and oranges. Maybe it might we wise to have = separate >> draft for both and have references linking together as the same algorith= m >> concept and mathematically however the actual code implementation would >> vary as the LSDB link state data structures are completely different. >> >> >> >> Later =3D Dynamic flooding =3D 2 modes Centralized leader based and >> distributed >> >> >> >> https://datatracker.ietf.org/doc/draft-ietf-lsr-dynamic-flooding/ >> >> >> >> >> This later draft per section excerpt provides both centralized and >> distributed algorithm see below >> >> >> >> *6.4 . Area Leader Responsibilities* >> >> >> >> If the Area Leader operates in centralized mode, it MUST advertise >> >> algorithm 0 in its Area Leader Sub-TLV. In order for Dynamic >> >> Flooding to be enabled it also MUST compute and advertise a flooding >> >> topology for the area. The Area Leader may update the flooding >> >> topology at any time, however, it should not destabilize the network >> >> with undue or overly frequent topology changes. If the Area Leader >> >> operates in centralized mode and needs to advertise a new flooding >> >> topology, it floods the new flooding topology on both the new and old >> >> flooding topologies. >> >> >> >> If the Area Leader operates in distributed mode, it MUST advertise a >> >> non-zero algorithm in its Area Leader Sub-TLV. >> >> >> >> When the Area Leader advertises algorithm 0 in its Area Leader Sub- >> >> TLV and does not advertise a flooding topology, Dynamic Flooding is >> >> disabled for the area. Note this applies whether the Area Leader >> >> intends to operate in centralized mode or in distributed mode. >> >> >> >> Note that once Dynamic Flooding is enabled, disabling it risks >> >> destabilizing the network. >> >> >> >> *6.5 . Distributed Flooding Topology Calculation* >> >> >> >> If the Area Leader advertises a non-zero algorithm in its Area Leader >> >> Sub-TLV, all nodes in the area that support Dynamic Flooding and the >> >> value of algorithm advertised by the Area Leader MUST compute the >> >> flooding topology based on the Area Leader's advertised algorithm. >> >> >> >> Nodes that do not support the value of algorithm advertised by the >> >> Area Leader MUST continue to use standard flooding mechanism as >> >> defined by the protocol. >> >> >> >> Nodes that do not support the value of algorithm advertised by the >> >> Area Leader MUST be considered as Dynamic Flooding incapable nodes by >> >> the Area Leader. >> >> >> >> If the value of the algorithm advertised by the Area Leader is from >> >> the range 128-254 (private distributed algorithms), it is the respons= ibility of the >> >> network operator to guarantee that all nodes in the area have a common u= nderstanding of what the given algorithm value represents. >> >> >> >> Former =3D WG LC >> >> https://datatracker.ietf.org/doc/html/draft-cc-lsr-flooding-reduction-08 >> >> >> >> >> Provides algorithm for distributed mode for this draft as well as the >> algorithm to be used for distributed mode later dynamic flooding draft >> >> >> >> Separate question- >> >> >> >> In light of the flooding algorithm and seeing that at the bottom of >> section 6.5 mentions flooding algorithm are the IANA codepoints reserved >> for flooding unique and non overlapping with the flex algo codepoints I >> believe 0-127. I would think the flooding algorithm range of values is >> completely separate since a different function then flex algo values. >> >> >> >> https://datatracker.ietf.org/doc/html/draft-ietf-lsr-flex-algo-07 >> >> >> >> >> >> >> Best Regards, >> >> Huaimo >> ------------------------------ >> >> *From:* Gyan Mishra >> *Sent:* Thursday, May 21, 2020 10:36 AM >> >> >> *To:* Huaimo Chen >> *Cc:* Acee Lindem (acee) ; lsr@ietf.o= rg >> >> *Subject:* Re: [Lsr] Flooding Topology Computation Algorithm - >> draft-cc-lsr-flooding-reduction-08 Working Group Adoption Call >> >> >> >> >> >> >> >> On Wed, May 20, 2020 at 11:59 PM Huaimo Chen >> wrote: >> >> Hi Gyan, >> >> >> >> Thanks much for your questions. My answers are inline below with [HC= ]. >> >> >> >> Best Regards, >> >> Huaimo >> ------------------------------ >> >> *From:* Gyan Mishra >> *Sent:* Wednesday, May 20, 2020 11:14 AM >> *To:* Huaimo Chen >> *Cc:* Acee Lindem (acee) ; lsr@ietf.o= rg >> >> *Subject:* Re: [Lsr] Flooding Topology Computation Algorithm - >> draft-cc-lsr-flooding-reduction-08 Working Group Adoption Call >> >> >> >> Huaimo >> >> >> >> This is a much needed feature that operators have been needing for >> densely meshed topologies that commonly exist in data centers to >> accommodate very high bandwidth E-W traffic. >> >> [HC]: Thank you very much. >> >> >> >> Below is link from Cisco which has introduced feature for dynamic >> flooding in clos high density ECMP data center topologies. >> >> >> >> Please look at the feature description and it does seem to be exactly th= e >> same as this draft. Please confirm. >> >> [HC]: It seems different. >> >> >> >> There maybe other vendors due to industry demand have to get the feature >> deployed before it reaches standards vendor consensus with the IETF. >> >> >> >> >> https://www.cisco.com/c/en/us/products/collateral/switches/nexus-9000-se= ries-switches/white-paper-c11-743015.html >> >> >> >> >> We are testing this feature and planning to deploy but wanted to ensure >> that this is the same as the draft on the standards track. >> >> [HC]: The feature appears implemented draft "Dynamic Flooding on Dense >> Graphs", which does not include any flooding topology computation >> algorithm.. >> >> >> >> Gyan> How does this draft compare to the WG LC draft for flood >> reduction. Would they be two eventual standard options in the operators >> toolbox or competing features for optimized flood reduction. Would havi= ng >> two flood reduction features standardized versus one default IGP flood >> reduction feature be confusing for operators. Just as it was confusing = to >> me. >> >> >> >> >> >> https://datatracker.ietf.org/doc/draft-ietf-lsr-dynamic-flooding/ >> >> >> >> >> Kind regards >> >> >> >> Gyan >> >> >> >> >> >> On Tue, May 19, 2020 at 11:52 PM Huaimo Chen >> wrote: >> >> Hi Gyan, >> >> >> >> Thank you very much for your questions and support. >> >> >> >> This Flooding Topology Computation algorithm can be used in the >> Dynamic Flooding on Dense Graphs to compute the flooding topologies for >> the data center clos dense meshed topologies with many ECMP paths. It ca= n >> be used by the area leader in the centralized mode to compute the floodi= ng >> topology. >> >> >> >> Best Regards, >> >> Huaimo >> ------------------------------ >> >> *From:* Lsr on behalf of Gyan Mishra < >> hayabusagsm@gmail.com> >> *Sent:* Tuesday, May 19, 2020 2:39 AM >> *To:* Yanhe Fan >> *Cc:* lsr@ietf.org ; Acee Lindem (acee) > 40cisco.com@dmarc.ietf.org> >> *Subject:* Re: [Lsr] Flooding Topology Computation Algorithm - >> draft-cc-lsr-flooding-reduction-08 Working Group Adoption Call >> >> >> >> >> >> I support WG adoption and have a few questions related to the draft. >> >> >> >> Does this flooding algorithm use the dynamic flooding algorithm used in >> data center clos dense meshed topologies with many ECMP paths where the >> flood is decoupled from the physical topology. In the dynamic flooding >> algorithm mentioned in centralized mode the flooding is computed by the >> area leader and distributed to all nodes. In distributed mode each mode >> the area leader determines the algorithm and then each node computes the >> flooding topology based on the algorithm. >> >> >> >> This dynamic algorithm for optimized flood reduction would reduce the >> amount of redundant flooding in highly densely meshed ospf or Isis >> topologies. So this optimization of flooding would improving overall li= nk >> state routing protocol convergence. >> >> >> >> Gyan >> >> >> >> On Mon, May 18, 2020 at 3:37 PM Yanhe Fan wrote: >> >> Support it as a co-author. >> >> >> >> Thanks, >> >> Yanhe >> >> >> >> *From:* Lsr *On Behalf Of *Acee Lindem (acee) >> *Sent:* Friday, May 15, 2020 3:40 PM >> *To:* lsr@ietf.org >> *Subject:* [Lsr] Flooding Topology Computation Algorithm - >> draft-cc-lsr-flooding-reduction-08 Working Group Adoption Call >> >> >> >> This begins a 3 week (due to holidays) WG adoption call for the =E2=80= =9CFlooding >> Topology Computation Algorithm=E2=80=9D draft. Please issue your support= or >> objection to this list by 11:59 PM, UTC on June 5th, 2020. Here is a URL >> for your convenience. >> >> >> >> https://datatracker.ietf.org/doc/draft-cc-lsr-flooding-reduction/ >> >> >> >> >> Thanks, >> Acee >> >> _______________________________________________ >> Lsr mailing list >> Lsr@ietf.org >> https://www.ietf.org/mailman/listinfo/lsr >> >> >> -- >> >> *Error! Filename not specified.* >> >> >> *Gyan >> Mishra* >> >> >> *Network >> Solutions Architect * >> >> >> >> >> >> *M 301 502-1347 13101 Columbia Pike >> >> *Silver Spring, MD >> >> >> >> >> -- >> >> *Error! Filename not specified.* >> >> >> *Gyan Mishra* >> >> *Network Solutions Architect * >> >> >> >> *M 301 502-1347 >> 13101 >> Columbia Pike >> >> *Silver Spring, MD >> >> >> >> >> >> >> -- >> >> *Error! Filename not specified.* >> >> >> *Gyan Mishra* >> >> *Network Solutions Architect * >> >> >> >> *M 301 502-1347 13101 Columbia Pike >> >> *Silver Spring, MD >> >> >> >> >> >> >> >> >> -- >> >> *Error! Filename not specified.* >> >> >> *Gyan Mishra* >> >> *Network Solutions Architect * >> >> >> >> *M 301 502-1347 13101 Columbia Pike >> >> *Silver Spring, MD >> >> >> >> >> >> >> >> >> -- >> >> [image: Image removed by sender.] >> >> >> *Gyan Mishra* >> >> *Network Solutions Architect * >> >> >> >> *M 301 502-1347 13101 Columbia Pike >> >> *Silver Spring, MD >> >> >> >> >> >> >> >> >> -- >> >> >> >> >> *Gyan Mishra* >> >> *Network Solutions A**rchitect * >> >> >> >> *M 301 502-1347 13101 Columbia Pike >> >> *Silver Spring, MD >> >> >> >> >> > -- > > > > *Gyan Mishra* > > *Network Solutions A**rchitect * > > > > *M 301 502-134713101 Columbia Pike *Silver Spring, MD > > -- *Gyan Mishra* *Network Solutions A**rchitect * *M 301 502-134713101 Columbia Pike *Silver Spring, MD --0000000000002f696005a6466f66 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hi Huaimo

Thinking about physical topology a little further as with th= e FT algorithm it makes sense to decouple the FT from the physical however = the overall coverage is based on those basic parameters of degree number of= links and nodes as well as width and depth of the topology.






Gyan=C2=A0

On Fri, May 22, 2020 at 8:41 PM Gyan Mishra <hayabusagsm@gmail.com> wrote:
Hi Huaimo

Thank you for the slide deck.=C2=A0 That = really helps understand the algorithm. =C2=A0

I will let you=C2=A0know if I have any questions.

The goal of the algorithm i= s to speed up convergence by limiting the convergence scope and expanding o= ut 1 link at a time until all nodes and links are part of the flood scope.= =C2=A0 From the examples in the slide deck I did not see mentioned what is = done with the dynamic flooding algorithm where when you have a meshed netwo= rk in the slide 5 examples, how do you limit the flooding on redundant link= s duplicate flooding with the many meshed paths as you iteratively grow the= FT nodes scope Cq().=C2=A0 I believe with the dynamic flooding it does a d= egree of 2 so 2 links between nodes. =C2=A0

I think with clos spine leaf the mesh is much more inte= nsive and problematic with ECMP then a circular topology nodal mesh that re= sults in duplicate redundant flooding that slows down convergence.=C2=A0 Wi= th spine leaf it=E2=80=99s like an X horizontal width axis and then depth i= s spine to leaf links.=C2=A0 With spine leaf as you grow sideways and the s= pine expand the redundant ECMP grows and redundant flooding grows exponenti= ally and is much worse then circular nodal mesh. =C2=A0

Thank you=C2=A0

=
Gyan

On Fri, May 22, 2020 at 10:05 AM Huaimo Ch= en <huaim= o.chen@futurewei.com> wrote:
Hi Gyan,

=C2=A0 =C2=A0 Thanks much for your questions. My answers/explanations are i= nline below.

Best Regards,
Huaimo
From: Gyan Mishra <hayabusagsm@gmail= .com>
Sent: Thursday, May 21, 202= 0 10:13 PM
To: Acee Lindem (acee) <= acee@cisco.com>
Cc: Huaimo Chen <huaimo.chen@futurewei.com>; ls= r@ietf.org <lsr@ietf.org>
Subject: Re: [Lsr] Flooding= Topology Computation Algorithm - draft-cc-lsr-flooding-reduction-08 Workin= g Group Adoption Call
=C2=A0

I think for both drafts it would be good to have a stick = diagram at a minimum. =C2=A0
[HC]: A diagram for illustrating the steps of the algorit= hm is in Appendix.
I majored in EE with math =C2=A0minor and both drafts are= hard to follow without a diagram with labels showing the exact topology ex= amples. =C2=A0

Four main topologies - full mesh, partial mesh and leaf s= pine ( 2 tier) and CLOS ( 3 tier) - real world scenario=E2=80=99s.

From the interim meeting was their a slide deck visual to= pology shared?=C2=A0
[HC]: The set of slides presented in IETF 105 is attached= .

That would help.

4.1=C2=A0

Step 1 - Build Cq candidate queue=C2=A0

For each node B on FT whose D is one (from minimum to maximum
       node ID), find a link L attached to B such that L's remote node =
R
       has minimum D and ID, add link L between B and R into FT and
       increase B's D and R's D by one.  Return FT.
My interpretation is the algorithm an iterative loop and = starts with any node in the candidate list so could start from edge and wor= k left to right or vice versa.=C2=A0 For loop to build FT from Cq =3D with = each node B with directly attached node R via link L.=C2=A0 Increment node B from Cq until the FT is build for all n= odes.=C2=A0 Instead of starting with a wide diameter FT matching physical t= opology we start micro topology with D=3D1 and go node by node.
[HC]: This (For each node B on FT .... Return FT.) is=C2= =A0an iterative loop after every node is added to FT. This loop connects each no= de whose D =3D 1 (i.e., there is only one link attached to it on FT) to a n= ode through a link on FT (i.e., add the link to FT) to make every node on F= T to have its D > 1. Page 5 of the attached slides shows some details for this loop.

4.2=C2=A0

1.  Finding and removing the first element with node A in Cq that is
       not on FT and one PH's D in PHs < MaxD and PH's D < PH=
's ConMaxD.

       If A is root R0, then add the element into FT

       otherwise  (i.e., A !=3D R0 with one PH's D in PHs < MaxD and=
 PH's
          D < PH's ConMaxD.  Assume that PH is the first one in PHs
          whose D < MaxD and PH's D < PH's ConMaxD), PH's=
 D++, and add A
          with D =3D 1 and PHs =3D {PH} into FT.

       Note:  if there is no element with a node in Cq satisfying the
          conditions, then algorithm may be restarted from R0, ++MaxD,
          Cq =3D {(R0,D=3D0,PHs =3D { })}, FT =3D { };
This is similar to 4.1 with micro topology with 2 directl= y connected nodes=C2=A0
[HC]: It is similar to 1. in section 4.1.

My interpretation of the algorithm from the verbiage.

So this draft starts in the middle of the topology and is= geared towards leaf spine 2 or 3 tier clos topology.

For this one we build the bi graph so that could be leaf = connected to two spines or spine connected to two leafs and iteratively bui= ld out the FT topology 3 node arch =C2=A0spine leaf spine or leaf spine lea= f.

Kind regards=C2=A0

Gyan

On Thu, May 21, 2020 at 7:01 PM Acee Lindem (acee) <acee@cisco.com> wro= te:

Hi Gyan,

=C2=A0

From: Gyan Mishra <hayabusagsm@gmail.com= >
Date: Thursday, May 21, 2020 at 4:20 PM
To: Acee Lindem <acee@cisco.com>
Cc: Huaimo Chen <huaimo.chen@futurewei.com>, "lsr@ietf.org" <lsr@ietf.org>
Subject: Re: [Lsr] Flooding Topology Computation Algorithm - draft-c= c-lsr-flooding-reduction-08 Working Group Adoption Call

=C2=A0

=C2=A0

Yes and I have started reviewing the LSR mai= l archives as I am late in the discussion for this.

=C2=A0

If you have link to any particular dates in = the archives would be helpful.

=C2=A0

No =E2=80=93 it was more an =E2=80=9Cevolution=E2=80=9D than an =E2=80= =9Cepiphany=E2=80=9D.

=C2=A0

That sums up all the questions I have so if = all answered in the archives then I am all set.

=C2=A0

I support the draft moving forward as flood = reduction is a much needed feature. =C2=A0

=C2=A0

I think overall both drafts will really help= large data centers with any overlay underlay vxlan spine leaf meshed CLOS = highly meshed topology that scales out horizontally with a large spine foot= print - this is a much much needed feature.=C2=A0 This also helps eliminate complexity of = the workaround of using BGP in the underlay which to me adds tremendous com= plexity.

=C2=A0

Here is the other recently presented dynamic flooding draft.

=C2=A0

https://datatracker.ietf.org/doc/draft-chen-lsr-dyn= amic-flooding-algorithm/

=C2=A0

You can see they both make use of the dynamic flooding infra in https://datatracker.ietf.org/doc/draft-ietf-lsr-dynamic-flooding/

=C2=A0

Thanks,

Acee

=C2=A0

=C2=A0

=C2=A0

=C2=A0

Kind regards=C2=A0

=C2=A0

Gyan=C2=A0

=C2=A0

On Thu, May 21, 2020 at 4:07 PM Acee Lindem = (acee) <acee@cisco.c= om> wrote:

Speaking as WG Co-chair:

=C2=A0

Hi Gyan,

=C2=A0

I guess you=E2=80=99ve joined this discussio= n late. It might be a good idea to review the LSR mailing list archives.

=C2=A0

= From: Gyan Mishra <hayabusagsm@gmail.com= >
Date: Thursday, May 21, 2020 at 1:51 PM
To: Huaimo Chen <huaimo.chen@futurewei.com>
Cc: Acee Lindem <acee@cisco.com>, "lsr@ietf.org" <lsr@ietf.org>
Subject: Re: [Lsr] Flooding Topology Computation Algorithm - draft-c= c-lsr-flooding-reduction-08 Working Group Adoption Call

=C2=A0

=C2=A0

=C2=A0

On Thu, May 21, 2020 at 11:01 AM Huaimo Chen &= lt;huaimo.ch= en@futurewei.com> wrote:

Hi = Gyan,

=C2= =A0

=C2= =A0 =C2=A0 Thanks much for your questions.

=C2= =A0

=C2= =A0Gyan> How does this draft compare to the WG LC draft for flood reduct= ion.=C2=A0 Would they be two eventual standard options in the operators too= lbox =C2=A0or competing features for optimized flood reduction. Would having two flood reduction features s= tandardized versus one default IGP flood reduction feature be confusing for= operators.=C2=A0 Just as it was confusing to me.=C2=A0

=C2= =A0

=C2= =A0 =C2=A0 [HC]: This draft plus the draft for flooding reduction can provi= de two modes of flooding reductions (i.e., centralized mode and distributed= mode). The latter describes the two modes, but does not include any flooding topology computation algo= rithm for the distributed mode. The former proposes a=C2=A0flooding topology computation algorithm to be used i= n the distributed mode.=C2=A0=C2=A0

=C2=A0

=C2=A0 =C2=A0Gyan> It maybe a good idea for= both documents to reference each other as to how they play together or =C2= =A0in some respects if any provide a homogeneous complete holistic solution= for flooding problem being solved. =C2=A0

=C2=A0

It is a good idea to have this new draft ref= erence the dynamic-flooding but not vice-versa. The existing dynamic floodi= ng draft provides a framework for any dynamic flooding algorithm that provi= des a separate flooding topology. This algorithm is just the first to be formally propose= d in a draft. Note that another algorithm was presented during the LSR virt= ual interim which replaced IETF 107. =C2=A0

=C2=A0

In my opinion it may not be a bad idea even to= combine both drafts so the solution is complete and holistic.=C2=A0 This w= ill also make the overall specification flow nicely. =C2=A0

=C2=A0

No =E2=80=93 we=E2=80=99re not going to do t= his.

=C2=A0

Thanks,

Acee

=C2=A0

I know that efforts were made by LSR to have a= common IGP solution, however there are many inherent differences between I= SIS and OSPF that from IGP Link state protocol perspective you can treat li= ke apples to apples but really it=E2=80=99s apples and oranges.=C2=A0 Maybe it might we wise t= o have separate draft for both and have references linking together as the = same algorithm concept and mathematically however the actual code implement= ation would vary as the LSDB link state data structures are completely different.=C2=A0

=C2=A0

Later =3D Dynamic flooding =3D 2 modes Central= ized leader based and distributed=C2=A0

=C2=A0

This later draft per section excerpt provides = both centralized and distributed algorithm see below=C2=A0

=C2=A0

6.4.=C2=A0 Area Leader Responsibilities
=C2=A0
=C2=A0=C2=A0 If the Area Leader operates in central=
ized mode, it MUST advertise<=
u style=3D"font-family:monospace">
=C2=A0=C2=A0 algorithm 0 in its Area Leader Sub-TLV=
.=C2=A0 In order for Dynamic<=
u style=3D"font-family:monospace">
=C2=A0=C2=A0 Flooding to be enabled it also MUST co=
mpute and advertise a flooding
=C2=A0=C2=A0 topology for the area.=C2=A0 The Area =
Leader may update the flooding
=C2=A0=C2=A0 topology at any time, however, it shou=
ld not destabilize the network
=C2=A0=C2=A0 with undue or overly frequent topology=
 changes.=C2=A0 If the Area Leader
=C2=A0=C2=A0 operates in centralized mode and needs=
 to advertise a new flooding<=
u style=3D"font-family:monospace">
=C2=A0=C2=A0 topology, it floods the new flooding t=
opology on both the new and old
=C2=A0=C2=A0 flooding topologies.
=C2=A0
=C2=A0=C2=A0 If the Area Leader operates in distrib=
uted mode, it MUST advertise a
=C2=A0=C2=A0 non-zero algorithm in its Area Leader =
Sub-TLV.
=C2=A0
=C2=A0=C2=A0 When the Area Leader advertises algori=
thm 0 in its Area Leader Sub-=

=C2=A0=C2=A0 TLV and does not advertise a flooding =
topology, Dynamic Flooding is=

=C2=A0=C2=A0 disabled for the area.=C2=A0 Note this=
 applies whether the Area Leader<=
/u>
=C2=A0=C2=A0 intends to operate in centralized mode=
 or in distributed mode.
=C2=A0
=C2=A0=C2=A0 Note that once Dynamic Flooding is ena=
bled, disabling it risks
=C2=A0=C2=A0 destabilizing the network.

=C2=A0


6.5.=C2=A0 Distributed Flooding Topology Calculation


=C2=A0


=C2=A0=C2=A0 If the Area Leader advertises a non-ze=
ro algorithm in its Area Leader


=C2=A0=C2=A0 Sub-TLV, all nodes in the area that su=
pport Dynamic Flooding and the


=C2=A0=C2=A0 value of algorithm advertised by the A=
rea Leader MUST compute the


=C2=A0=C2=A0 flooding topology based on the Area Le=
ader's advertised algorithm.<=
/u>


=C2=A0


=C2=A0=C2=A0 Nodes that do not support the value of=
 algorithm advertised by the<=
u style=3D"font-family:monospace">


=C2=A0=C2=A0 Area Leader MUST continue to use stand=
ard flooding mechanism as


=C2=A0=C2=A0 defined by the protocol.

=C2=A0


=C2=A0=C2=A0 Nodes that do not support the value of=
 algorithm advertised by the<=
u style=3D"font-family:monospace">


=C2=A0=C2=A0 Area Leader MUST be considered as Dyna=
mic Flooding incapable nodes by


=C2=A0=C2=A0 the Area Leader.


=C2=A0


=C2=A0=C2=A0 If the value of the algorithm advertis=
ed by the Area Leader is from=



=C2=A0=C2=A0 the range 128-254 (private distributed=
 algorithms), it is the responsibility of the=C2=A0


network operator to guarante=
e that all nodes in the area have a common understanding of what the given =
algorithm value represents.


=C2=A0

Former =3D WG LC=C2=A0

Provides algorithm for distributed mode for th= is draft as well as the algorithm to be used for distributed mode later dyn= amic flooding draft=C2=A0

=C2=A0

Separate question-

=C2=A0

In light of the flooding algorithm and seeing = that at the bottom of section 6.5 mentions flooding algorithm are the IANA = codepoints reserved for flooding unique and non overlapping with the flex a= lgo codepoints I believe 0-127.=C2=A0 I would think the flooding algorithm range of value= s is completely separate since a different function then flex algo values.<= u>

=C2=A0

=C2= =A0

Bes= t Regards,

Hua= imo

From: Gyan Mishra <hayabusagsm@gmail.com>
Sent: Thursday, May 21, 2020 10:36 AM


To: Huaimo Chen <huaimo.chen@futurewei.com>
Cc: Acee Lindem (acee) <acee=3D40cisco.com@dmarc.ietf.org>; lsr@ietf.org <lsr@ietf.org>
Subject: Re: [Lsr] Flooding Topology Computation Algorithm - draft-c= c-lsr-flooding-reduction-08 Working Group Adoption Call

=C2=A0

=C2=A0

=C2=A0

On Wed, May 20, 2020 at 11:59 PM Huaimo Chen &= lt;huaimo.ch= en@futurewei.com> wrote:

Hi = Gyan,

=C2= =A0

=C2= =A0 =C2=A0 Thanks much for your questions. My answers are inline below with= [HC].

=C2= =A0

Bes= t Regards,

Hua= imo

From: Gyan Mishra <hayabusagsm@gmail.com>
Sent: Wednesday, May 20, 2020 11:14 AM
To: Huaimo Chen <huaimo.chen@futurewei.com>
Cc: Acee Lindem (acee) <acee=3D40cisco.com@dmarc.ietf.org>; lsr@ietf.org <lsr@ietf.org>
Subject: Re: [Lsr] Flooding Topology Computation Algorithm - draft-c= c-lsr-flooding-reduction-08 Working Group Adoption Call

=C2=A0

Huaimo=C2=A0

=C2=A0

This is a much needed feature that operators h= ave been needing for densely meshed topologies that commonly exist in data = centers to accommodate very high bandwidth E-W traffic.

[HC]: Thank you very much.

=C2=A0

Below is link from Cisco which has introduced = feature for dynamic flooding in clos high density ECMP data center topologi= es.

=C2=A0

Please look at the feature description and it = does seem to be exactly the same as this draft.=C2=A0 Please confirm.=C2=A0=

[HC]: It seems different.=C2=A0<= /p>

=C2=A0

There maybe other vendors due to industry dema= nd have to get the feature deployed before it reaches standards vendor cons= ensus with the IETF.

=C2=A0

=C2=A0

We are testing this feature and planning to de= ploy but wanted to ensure that this is the same as the draft on the standar= ds track.

[HC]: The feature appears implemented draft "Dynamic Flooding on Dense Graph= s", which does not include any flooding topology computation algorithm= ..=C2=A0

=C2=A0

=C2=A0 =C2=A0 Gyan> How does this draft com= pare to the WG LC draft for flood reduction.=C2=A0 Would they be two eventu= al standard options in the operators toolbox =C2=A0or competing features fo= r optimized flood reduction. Would having two flood reduction features standardized versus one default IGP flood red= uction feature be confusing for operators.=C2=A0 Just as it was confusing t= o me.

=C2=A0

=C2=A0

Kind regards=C2=A0

=C2=A0

Gyan

=C2=A0

=C2=A0

On Tue, May 19, 2020 at 11:52 PM Huaimo Chen &= lt;huaimo.ch= en@futurewei.com> wrote:

Hi Gyan,

=C2= =A0

=C2=A0 =C2=A0 Thank you very much for your questi= ons and support.

=C2= =A0

=C2=A0 =C2=A0 This Flooding Topology Computation algorithm can be used in the Dynamic Flooding on Dense Graphs = to compute the flooding topologies for the=C2=A0data center clos dense mesh= ed topologies with many ECMP paths. It can be used by the area leader in th= e centralized mode to compute the flooding topology. =C2=A0=C2=A0

=C2=A0

Best Regards,

Huaimo

From: Lsr <lsr-bounces@ietf.org> on behalf of Gyan Mishra = <hayabusagsm@= gmail.com>
Sent: Tuesday, May 19, 2020 2:39 AM
To: Yanhe Fan <yfan@casa-systems.com>
Cc: lsr@ietf.org <lsr@ietf.org&g= t;; Acee Lindem (acee) <acee=3D40cisco.com@dmarc.ietf.org>
Subject: Re: [Lsr] Flooding Topology Computation Algorithm - draft-c= c-lsr-flooding-reduction-08 Working Group Adoption Call

=C2=A0

=C2=A0

I support WG adoption and have a few questions= related to the draft.

=C2=A0

Does this flooding algorithm use the dynamic f= looding algorithm used in data center clos dense meshed topologies with man= y ECMP paths where the flood is decoupled from the physical topology.=C2=A0= In the dynamic flooding algorithm mentioned in centralized mode the flooding is computed by the ar= ea leader and distributed to all nodes.=C2=A0 In distributed mode each mode= the area leader determines the algorithm and then each node computes the f= looding topology based on the algorithm. =C2=A0

=C2=A0

This dynamic algorithm for optimized flood red= uction would reduce the amount of redundant flooding in highly densely mesh= ed ospf or Isis topologies.=C2=A0 So this optimization of flooding would im= proving overall link state routing protocol convergence.

=C2=A0

Gyan=C2=A0

=C2=A0

On Mon, May 18, 2020 at 3:37 PM Yanhe Fan <= yfan@casa-system= s.com> wrote:

Support it as a co-author.

=C2=A0

Thanks,

Yanhe

______________________________________________= _
Lsr mailing list
Lsr@ietf.org
https://www.i= etf.org/mailman/listinfo/lsr

--

Error! Filename not specified.

Gyan Mishra

Network Solutions Architect=C2=A0

M 301 502-1347
13101 Columbia Pike=C2=A0
Silver Spring, MD

=C2=A0

--

Error! Filename not specified.

Gyan Mishra

Network Solutions Archit= ect=C2=A0

M 301 502-1347
13101 Columbia Pike=C2=A0
Silver Spring, MD

=C2=A0

--

Gyan Mishra

Network Solutions Archit= ect=C2=A0

M 301 502-1347
13101 Columbia Pike=C2=A0
Silver Spring, MD

=C2=A0

--

Gyan Mishra

Network Solutions Archit= ect=C2=A0

M 301 502-1347
13101 Columbia Pike=C2=A0
Silver Spring, MD

<= /a>

=C2=A0

--

<= span style=3D"font-family:Arial,sans-serif;color:black">Gyan Mishra<= /b>

<= span style=3D"font-family:Georgia,serif;color:black">Network Solutions Arch= itect=C2=A0

<= span style=3D"font-family:Georgia,serif;color:black">M 301 502-1347
13101 Columbia Pike=C2=A0
Silver Spring, MD

=C2=A0

--


Gyan M= ishra

Network Solutions Architect=C2=A0

M 301 502-1347
13101 Columbia Pike=C2=A0
= Silver Spring, MD


--


Gyan Mishra

Network Solutions Architect=C2=A0

M 301 502-1347
13101 Columbia Pike=C2=A0
<= /i>Silver Spring, MD


=
--
--0000000000002f696005a6466f66-- From nobody Sat May 23 02:29:29 2020 Return-Path: X-Original-To: lsr@ietf.org Delivered-To: lsr@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id 4B7A63A0AFA; Sat, 23 May 2020 02:29:20 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: Michael Scharf via Datatracker To: Cc: lsr@ietf.org, last-call@ietf.org, draft-ietf-ospf-te-link-attr-reuse.all@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 7.1.0 Auto-Submitted: auto-generated Precedence: bulk Message-ID: <159022616023.7090.5307349487936591982@ietfa.amsl.com> Reply-To: Michael Scharf Date: Sat, 23 May 2020 02:29:20 -0700 Archived-At: Subject: [Lsr] Tsvart last call review of draft-ietf-ospf-te-link-attr-reuse-12 X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 23 May 2020 09:29:27 -0000 Reviewer: Michael Scharf Review result: Ready This document has been reviewed as part of the transport area review team's ongoing effort to review key IETF documents. These comments were written primarily for the transport area directors, but are copied to the document's authors and WG to allow them to address any issues raised and also to the IETF discussion list for information. When done at the time of IETF Last Call, the authors should consider this review as part of the last-call comments they receive. Please always CC tsv-art@ietf.org if you reply to or forward this review. I have read this document as TSV-ART reviewer. As far as I can tell, there are no transport area issues. From nobody Sat May 23 13:44:06 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id C01703A0EA2 for ; Sat, 23 May 2020 13:44:03 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.087 X-Spam-Level: X-Spam-Status: No, score=-2.087 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_REMOTE_IMAGE=0.01, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id epprLPajzFtB for ; Sat, 23 May 2020 13:44:01 -0700 (PDT) Received: from mail-il1-x130.google.com (mail-il1-x130.google.com [IPv6:2607:f8b0:4864:20::130]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 2D78D3A0E9C for ; Sat, 23 May 2020 13:44:01 -0700 (PDT) Received: by mail-il1-x130.google.com with SMTP id j3so14108536ilk.11 for ; Sat, 23 May 2020 13:44:01 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=J/giIN5WbxIun4LgdRE0KAM8M8jSwZpNAK9zJMFIw/s=; b=Bl0Er3u+FP+k5mMrDDl8QnKiPV8xtRMaONjodzY6zmRFTiWlX79ooASatNGr4kKGNV NgOzIosTkXzwf7jzrWth8baiHSO61LRzHS2YuUVKaSOaMC1aU5dAtkhWy8zBu2THlxsF crH8WTCXol9lhYqMCBEpUijsG5KBRA3+FuqmXbL6t7bpyHY4EoAfwavbR9IngkSBW/IV jl9qsCACy0c6+dqPXlZzoPxsMDOOImuGbDZXoAnlogg7xQJOmB7h7iw6/6ocm8weDbgP RmSbwydQZwZtQdpZGwoRyPOxP0nOeDfw7ZCKDYHJuS2Sjw6Qaaw/LR6CA/ghyorfxFvr Ivnw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=J/giIN5WbxIun4LgdRE0KAM8M8jSwZpNAK9zJMFIw/s=; b=DXFtTbJUhtLVtNHcLj+VDsvomWlmmpYCigWdkE8yQJTldtd/aohWtPA4+xU1HWD6w0 QipY0GOZL0DomPbC0852YZiJsUgAB1rVyRt6LmeHoivGkTWIGPw9quQixE5pXDMj+T5S YvH/LTb2SN6iIYT5jBck6GVzrCNtsL+1qKSjQFhSMHlv3p0XX0E+1/VIhjZfzRz+P2j3 2SVX0RDShD0x41kiJGWwBPHEWmvG78zJLIesEyy79YCVBy+GcPWlO+LgfbSoCLMf+ZvC jPLRKhoAA5HtFa03W1IpFOPHOdrwfz62mL99kzIodejwQ0hWBtGsyuAdP1sTf2OQmM6J Dq5g== X-Gm-Message-State: AOAM531bIxbVVwbcYHpT7ju/MR1GCkeXfFd2H2ajyY2p8WLiDjpHCZPV TEy3wcFz7r9Q6kWgqYOVIY8fTRidnf6vpnNLHCw= X-Google-Smtp-Source: ABdhPJzlc2z8tRQcCDd6sGRmBJjDphnHEN64RvVyJ8zpVDyWD17+Ea78qW+N9zMGjeDfxePcZ84giVqxeI+kV1SRnrU= X-Received: by 2002:a92:ce03:: with SMTP id b3mr19704511ilo.82.1590266640418; Sat, 23 May 2020 13:44:00 -0700 (PDT) MIME-Version: 1.0 References: <63330FD6-EDE8-4938-AA85-948279C57E34@cisco.com> <424B17B1-D66D-4708-A819-855E972841AF@cisco.com> <331DE9C9-BF8A-483D-B4D5-366D3FBF4C22@tony.li> In-Reply-To: <331DE9C9-BF8A-483D-B4D5-366D3FBF4C22@tony.li> From: Gyan Mishra Date: Sat, 23 May 2020 16:43:49 -0400 Message-ID: To: tony.li@tony.li Cc: "Acee Lindem (acee)" , Huaimo Chen , "lsr@ietf.org" Content-Type: multipart/alternative; boundary="000000000000334df805a656ce73" Archived-At: Subject: Re: [Lsr] Flooding Topology Computation Algorithm - draft-cc-lsr-flooding-reduction-08 Working Group Adoption Call X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 23 May 2020 20:44:05 -0000 --000000000000334df805a656ce73 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Fri, May 22, 2020 at 9:02 PM wrote: > > Hi Gyan, > > I think with clos spine leaf the mesh is much more intensive and > problematic with ECMP then a circular topology nodal mesh that results in > duplicate redundant flooding that slows down convergence. With spine lea= f > it=E2=80=99s like an X horizontal width axis and then depth is spine to l= eaf > links. With spine leaf as you grow sideways and the spine expand the > redundant ECMP grows and redundant flooding grows exponentially and is mu= ch > worse then circular nodal mesh. > > > One very nice thing about dynamic flooding is that it computes a flooding > topology at the node level. If the adjacency between A and B is on the > flooding topology, then any single link between them may be used for > flooding. If you have 128 way parallel links, this is an immediate 128x > improvement in flooding overhead. What=E2=80=99s more, A and B do not ne= ed to > agree on which link they are using and can use different links, resulting > in an asymmetric situation, without any loss of correctness or performanc= e. > Gyan>. Agreed. The dynamic flooding really helps with X way ECMP prevalent in high density data center clos multi tier leaf spine parial mesh topologies that scale massive bandwidth breadth wise horizontally for E-W flows. > > Regards, > Tony > > -- *Gyan Mishra* *Network Solutions A**rchitect * *M 301 502-134713101 Columbia Pike *Silver Spring, MD --000000000000334df805a656ce73 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable

--
<= div dir=3D"ltr">


Gyan Mishra

Network Solutions Architect=C2=A0

, Huaimo Chen , "lsr@ietf.org" Content-Type: multipart/alternative; boundary="0000000000007f182f05a66c66be" Archived-At: Subject: Re: [Lsr] Flooding Topology Computation Algorithm - draft-cc-lsr-flooding-reduction-08 Working Group Adoption Call X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 24 May 2020 22:29:53 -0000 --0000000000007f182f05a66c66be Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hi Acee Do you know if the dynamic flooding algorithm discussed during interim ietf by Sarah and Toni is the same as the one implemented by Cisco on Nexus platform or is Cisco=E2=80=99s Dynamic flooding a proprietary implementatio= n? Cisco=E2=80=99s flooding algorithm does seem almost identical to dynamic fl= ooding. Cisco Dynamic flooding - Nexus 9k https://www.cisco.com/c/en/us/products/collateral/switches/nexus-9000-serie= s-switches/white-paper-c11-743015.html Dynamic Flooding - Arista - Sarah & Toni https://www.ietf.org/id/draft-chen-lsr-dynamic-flooding-algorithm-00.html Flood reduction- H Chen - WG adoption pending https://datatracker.ietf.org/doc/html/draft-cc-lsr-flooding-reduction-08 I know we are trying to adopt an flooding algorithm and from my reading up on all proposed algorithms, the dynamic flooding seems to be geared towards Data Center partial mesh high x ECMP leaf spine architecture, where redundant flooding is problematic using either centralized area leader or distributed flooding using same dynamic algorithm, versus the call for adoption flood reduction algorithm seems to geared towards full mesh but from what I can tell would not be the preferred for clos multi tier DC leaf spine topology with high x ECMP paths= . Why would we not want to adopt the best algorithm that is best for both full mesh and non full mesh leaf spine topology algorithm that works for all physical topologies and adopt that draft. Unless a one size fits all won=E2=80=99t work I would like to understand wh= y one best solution draft we come up with for an FT algorithm for all possible physical topologies cannot be picked for WG adoption. Why would we want to adopt multiple flooding algorithms? Gyan On Sat, May 23, 2020 at 4:43 PM Gyan Mishra wrote: > > > On Fri, May 22, 2020 at 9:02 PM wrote: > >> >> Hi Gyan, >> >> I think with clos spine leaf the mesh is much more intensive and >> problematic with ECMP then a circular topology nodal mesh that results i= n >> duplicate redundant flooding that slows down convergence. With spine le= af >> it=E2=80=99s like an X horizontal width axis and then depth is spine to = leaf >> links. With spine leaf as you grow sideways and the spine expand the >> redundant ECMP grows and redundant flooding grows exponentially and is m= uch >> worse then circular nodal mesh. >> >> >> One very nice thing about dynamic flooding is that it computes a floodin= g >> topology at the node level. If the adjacency between A and B is on the >> flooding topology, then any single link between them may be used for >> flooding. If you have 128 way parallel links, this is an immediate 128x >> improvement in flooding overhead. What=E2=80=99s more, A and B do not n= eed to >> agree on which link they are using and can use different links, resultin= g >> in an asymmetric situation, without any loss of correctness or performan= ce. >> > > Gyan>. Agreed. The dynamic flooding really helps with X way ECMP > prevalent in high density data center clos multi tier leaf spine parial > mesh topologies that scale massive bandwidth breadth wise horizontally fo= r > E-W flows. > >> >> Regards, >> Tony >> >> -- > > > > *Gyan Mishra* > > *Network Solutions A**rchitect * > > > > *M 301 502-134713101 Columbia Pike *Silver Spring, MD > > -- *Gyan Mishra* *Network Solutions A**rchitect * *M 301 502-134713101 Columbia Pike *Silver Spring, MD --0000000000007f182f05a66c66be Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable

Hi Acee

Do you know if the dynamic flooding algorithm discussed during= interim ietf by Sarah and Toni is the same as the one implemented by Cisco= on Nexus platform or is Cisco=E2=80=99s Dynamic flooding a proprietary imp= lementation?

Cisco=E2=80= =99s flooding algorithm does seem almost identical to dynamic flooding.

Cisco Dynamic flooding - Ne= xus 9k


Dynamic= Flooding - Arista - Sarah & Toni


Flood red= uction- H Chen - WG adoption pending=C2=A0


=

I know we are trying to adopt= an flooding algorithm=C2=A0
and from my readin= g up on all proposed algorithms, the dynamic flooding seems to be geared to= wards Data Center =C2=A0partial mesh high x ECMP leaf spine architecture, w= here redundant flooding is problematic using either centralized area leader= or distributed flooding using same dynamic algorithm, =C2=A0versus the cal= l for adoption flood reduction algorithm seems to geared towards full mesh = but from what I can tell would not be the preferred for clos multi tier DC = leaf spine topology with high x ECMP paths.

Why would we not want to adopt the best algorithm that = is best for both full mesh and non full mesh leaf spine topology algorithm = that works for all physical topologies and adopt that draft. =C2=A0

Unless a one size fits all won= =E2=80=99t work I would like to understand why one best solution draft we c= ome up with for an FT algorithm for all possible physical topologies cannot= be picked for WG adoption.

Why would we want to adopt multiple flooding algorithms?

Gyan

On Sat, May 23, 2020 at 4:43 PM G= yan Mishra <hayabusagsm@gmail.c= om> wrote:


On Fri, May 22, 2= 020 at 9:02 PM <ton= y.li@tony.li> wrote:

Hi Gyan,

I think with clos spine leaf the mesh is much more intensive a= nd problematic with ECMP then a circular topology nodal mesh that results i= n duplicate redundant flooding that slows down convergence.=C2=A0 With spin= e leaf it=E2=80=99s like an X horizontal width axis and then depth is spine= to leaf links.=C2=A0 With spine leaf as you grow sideways and the spine ex= pand the redundant ECMP grows and redundant flooding grows exponentially an= d is much worse then circular nodal mesh. =C2=A0
One very nice thing about dynamic flooding is that it computes= a flooding topology at the node level.=C2=A0 If the adjacency between A an= d B is on the flooding topology, then any single link between them may be u= sed for flooding.=C2=A0 If you have 128 way parallel links, this is an imme= diate 128x improvement in flooding overhead.=C2=A0 What=E2=80=99s more, A a= nd B do not need to agree on which link they are using and can use differen= t links, resulting in an asymmetric situation, without any loss of correctn= ess or performance.=C2=A0

=C2=A0 =C2=A0Gyan>. Agreed.=C2=A0 The dynamic flood= ing really helps with X way ECMP prevalent in high density data center clos= multi tier leaf spine parial mesh topologies that scale massive bandwidth = breadth wise horizontally for E-W flows.

=
Regards,
Tony

<= /div>
--


Gyan Mishra

Network Solutions Architect=C2=A0

M 301 502-1347
13101 Columbia Pike= =C2=A0
Silver Spring, MD


=
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--0000000000007f182f05a66c66be-- From nobody Sun May 24 15:41:29 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 5DAE23A0DC8 for ; Sun, 24 May 2020 15:41:26 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.501 X-Spam-Level: X-Spam-Status: No, score=-1.501 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FORGED_FROMDOMAIN=0.249, FREEMAIL_FROM=0.001, HEADER_FROM_DIFFERENT_DOMAINS=0.249, SPF_HELO_NONE=0.001, SPF_PASS=-0.001] autolearn=no autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id W32zicTXTK8r for ; Sun, 24 May 2020 15:41:24 -0700 (PDT) Received: from mail-pl1-x635.google.com (mail-pl1-x635.google.com [IPv6:2607:f8b0:4864:20::635]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 36D273A0BDD for ; Sun, 24 May 2020 15:41:24 -0700 (PDT) Received: by mail-pl1-x635.google.com with SMTP id x10so6789342plr.4 for ; Sun, 24 May 2020 15:41:24 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=sender:mime-version:subject:from:in-reply-to:date:cc :content-transfer-encoding:message-id:references:to; bh=1CSuEPbSQ7Vr7PX9swq/INk1poFdpJOwrZohRPPruuw=; b=T3Ivop4/dwA9LooNS3yQ/4k5VvAw1ztLWuq1dc85Zehig8nmjSTOKmNeDRX07Qlu8h 0Fs00CdFiCst5a/OATHYeGahQw3yZ+negDjnQEfvIrCByprHMfuftG9uUbeMenh/BpA9 4aPRACMN/SCOKrqK18+SAnNLui6Gcofrw/qUu8XdPVtKslKHRTjtg+uLcsYhXhTkSLRU eefkRPbCNZO+xjiP4ZdVFfrNHLW/+DZqj3VUmvQ3akqpdJ/FcEMvf9+e/stvD4q+S7W6 fGJDGZ90JVvmwk811Lp7DkZMt/lv+p7MAXHMWtSzsRhvgeB6lsQW/09ArYjjcJpMNCn0 YFYQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:mime-version:subject:from:in-reply-to :date:cc:content-transfer-encoding:message-id:references:to; bh=1CSuEPbSQ7Vr7PX9swq/INk1poFdpJOwrZohRPPruuw=; b=tTHWvP/pi4Jv4hWWDlC7rBlr6wm7gPL6D956kt9mvJL1Haw3FrsGE4kFQ45mKldMD3 BEfhNJGYHSGpnGzPKLv9jBl2dIY+WyzAvzc4o7PxW6Y/C9cbc60lmqmYAJMmtH2oMslR IFyJifedD2toDoV6IlBRp4aoNSHlZpeJ8BarocXjv4O4Op3ifnUk6kO5jAT0EDDP0Ysf 9EUzUch5sB95yIrmGJsPHHrKxrZFi88ywA9Ebnlaag8DNs+fkKrpYBYomQWv9C73dtm2 A+3Y35FLxQHPohy6IBKLGKQdkk0aNHtFxYQhnQHrk0klc74LwgQVfETmygnmSJPSHJNf H/+A== X-Gm-Message-State: AOAM530fusaRWsi3nEtSFy1Nj6pblju0f+bq7f5xEjT4kxxafUYELMjX rCOMVvqo+Pi+Lmg190zLgMY= X-Google-Smtp-Source: ABdhPJw8B8xcoR/6agVNWmks9GRI82pKgbl8qvfSi7zKNoZ90opcpwZmEyDBkQP+38toalFTlGpiOA== X-Received: by 2002:a17:90a:a60a:: with SMTP id c10mr17155411pjq.143.1590360083767; Sun, 24 May 2020 15:41:23 -0700 (PDT) Received: from [10.95.93.243] ([162.210.129.5]) by smtp.gmail.com with ESMTPSA id c24sm1072906pfo.124.2020.05.24.15.41.22 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Sun, 24 May 2020 15:41:23 -0700 (PDT) Sender: Tony Li Content-Type: text/plain; charset=utf-8 Mime-Version: 1.0 (Mac OS X Mail 13.4 \(3608.80.23.2.2\)) From: tony.li@tony.li In-Reply-To: Date: Sun, 24 May 2020 15:41:21 -0700 Cc: Sarah Chen , "Acee Lindem (acee)" , Huaimo Chen , "lsr@ietf.org" Content-Transfer-Encoding: quoted-printable Message-Id: <578ADAE1-989A-42E1-A4C1-4DC3637E727C@tony.li> References: <63330FD6-EDE8-4938-AA85-948279C57E34@cisco.com> <424B17B1-D66D-4708-A819-855E972841AF@cisco.com> <331DE9C9-BF8A-483D-B4D5-366D3FBF4C22@tony.li> To: Gyan Mishra X-Mailer: Apple Mail (2.3608.80.23.2.2) Archived-At: Subject: Re: [Lsr] Flooding Topology Computation Algorithm - draft-cc-lsr-flooding-reduction-08 Working Group Adoption Call X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 24 May 2020 22:41:26 -0000 Hi Gyan, > Do you know if the dynamic flooding algorithm discussed during interim = ietf by Sarah and Toni is the same as the one implemented by Cisco on = Nexus platform or is Cisco=E2=80=99s Dynamic flooding a proprietary = implementation? It appears not to be. Our algorithm is not limited to leaf-spine = topologies and has been tested against numerous other dense and sparse = topologies. > Why would we not want to adopt the best algorithm that is best for = both full mesh and non full mesh leaf spine topology algorithm that = works for all physical topologies and adopt that draft. =20 Proving that an algorithm is =E2=80=98optimal=E2=80=99 is going to be = very difficult, both from a theoretical and market standpoint. As is = frequently the case with IETF, we are proposing many ideas and trying to = sort through them. > Unless a one size fits all won=E2=80=99t work I would like to = understand why one best solution draft we come up with for an FT = algorithm for all possible physical topologies cannot be picked for WG = adoption. >=20 > Why would we want to adopt multiple flooding algorithms? Adoption does not imply that it will be standardized. It merely means = that it=E2=80=99s part of the working group=E2=80=99s effort. It is up = to the WG and the market to decide which algorithms we should pursue. = Some may be enhanced, some may be revised, and some may be discarded. We = can also adopt all of them and let the market sort it out. That=E2=80=99s= probably not the optimal approach from a technological perspective, but = making real decisions in the modern IETF is very hard. 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Mon, 25 May 2020 01:28:18 +0000 From: Huaimo Chen To: Gyan Mishra CC: "Acee Lindem (acee)" , "lsr@ietf.org" Thread-Topic: [Lsr] Flooding Topology Computation Algorithm - draft-cc-lsr-flooding-reduction-08 Working Group Adoption Call Thread-Index: AQHWKvCWbO+rNwui80Sty0q3wo/aI6iuQDRQgAC6fICAAVrmiIAAx0uAgADIYX+AAL9sAIAAAVeagAA06ID//+MZAIAARoiA///qD4CAAHjEgIAAvJSBgAC7/oCAAyNr1A== Date: Mon, 25 May 2020 01:28:18 +0000 Message-ID: References: <63330FD6-EDE8-4938-AA85-948279C57E34@cisco.com> <424B17B1-D66D-4708-A819-855E972841AF@cisco.com> , In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: gmail.com; dkim=none (message not signed) header.d=none;gmail.com; dmarc=none action=none header.from=futurewei.com; x-originating-ip: [2601:199:4300:8e5a:74ce:8eb8:ed16:ceb1] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: 363b83c4-0176-41cf-cc0c-08d8004ae7a6 x-ms-traffictypediagnostic: MN2PR13MB2879: x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:10000; 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boundary="_000_MN2PR13MB31170A83209564D545228B6EF2B30MN2PR13MB3117namp_" MIME-Version: 1.0 X-OriginatorOrg: Futurewei.com X-MS-Exchange-CrossTenant-Network-Message-Id: 363b83c4-0176-41cf-cc0c-08d8004ae7a6 X-MS-Exchange-CrossTenant-originalarrivaltime: 25 May 2020 01:28:18.5753 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 0fee8ff2-a3b2-4018-9c75-3a1d5591fedc X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: oigEwAIoYKddmieQsm9/taA0v3Y7o8d/4kOmK3B4YfhcjUxWtLFPtYWin7gDm0ksePkE5Nl3ilbd5YsgmppdiA== X-MS-Exchange-Transport-CrossTenantHeadersStamped: MN2PR13MB2879 Archived-At: Subject: Re: [Lsr] Flooding Topology Computation Algorithm - draft-cc-lsr-flooding-reduction-08 Working Group Adoption Call X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 25 May 2020 01:28:25 -0000 --_000_MN2PR13MB31170A83209564D545228B6EF2B30MN2PR13MB3117namp_ Content-Type: text/plain; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable Hi Gyan, Thanks much for your questions. My answers/explanations are inline belo= w. Best Regards, Huaimo ________________________________ From: Gyan Mishra Sent: Friday, May 22, 2020 8:41 PM To: Huaimo Chen Cc: Acee Lindem (acee) ; lsr@ietf.org Subject: Re: [Lsr] Flooding Topology Computation Algorithm - draft-cc-lsr-f= looding-reduction-08 Working Group Adoption Call Hi Huaimo Thank you for the slide deck. That really helps understand the algorithm. I will let you know if I have any questions. The goal of the algorithm is to speed up convergence by limiting the conver= gence scope and expanding out 1 link at a time until all nodes and links ar= e part of the flood scope. From the examples in the slide deck I did not s= ee mentioned what is done with the dynamic flooding algorithm where when yo= u have a meshed network in the slide 5 examples, how do you limit the flood= ing on redundant links duplicate flooding with the many meshed paths as you= iteratively grow the FT nodes scope Cq(). I believe with the dynamic floo= ding it does a degree of 2 so 2 links between nodes. [HC]: The slide 5 example illustrates step 4 of the algorithm in section 4.= 1. When the algorithm reaches this step, all the nodes are on the FT, but = some of them may have degree of 1 (i.e., one link on the FT connected to th= e node). This step makes sure that every node on the FT has degree of at le= ast 2. It seems that the dynamic flooding expects the FT having its every = node with degree of at least 2 for redundancy. In the Dynamic Flooding on D= ense Graphs, link states will be flooded over the links on the FT. For exam= ple, for a node with degree of N (e.g., 3), when the node receives a link s= tate from one link on the FT, it will flood the link state to the other N-1= (e.g., 3-1=3D2) links on the FT. I think with clos spine leaf the mesh is much more intensive and problemati= c with ECMP then a circular topology nodal mesh that results in duplicate r= edundant flooding that slows down convergence. With spine leaf it=92s like= an X horizontal width axis and then depth is spine to leaf links. With sp= ine leaf as you grow sideways and the spine expand the redundant ECMP grows= and redundant flooding grows exponentially and is much worse then circular= nodal mesh. [HC]: In the slides, a full mess topology is used to illustrate the algorit= hm in some details. The algorithm can be used to compute FT for any other t= opology such as clos spine leaf. For topology with M (e.g., 100) parallel l= inks between any pair of nodes X and Y, the algorithm will just add one lin= k to the FT between X and Y, the other M - 1 (e.g., 100-1 =3D 99) links wil= l not be added to the FT. Thus the link states will flood over only this on= e link between X and Y on the FT and will not flood over the other M - 1 (e= .g., 100 - 1 =3D 99) links, which are not on the FT. Thank you Gyan --_000_MN2PR13MB31170A83209564D545228B6EF2B30MN2PR13MB3117namp_ Content-Type: text/html; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable
Hi Gyan,

    Thanks much for your questions. My answers/explanations are i= nline below.
 
Best Regards,
Huaimo
From: Gyan Mishra <hayab= usagsm@gmail.com>
Sent: Friday, May 22, 2020 8:41 PM
To: Huaimo Chen <huaimo.chen@futurewei.com>
Cc: Acee Lindem (acee) <acee@cisco.com>; lsr@ietf.org <lsr@= ietf.org>
Subject: Re: [Lsr] Flooding Topology Computation Algorithm - draft-c= c-lsr-flooding-reduction-08 Working Group Adoption Call
 
Hi Huaimo

Thank you for the slide deck.  That really helps und= erstand the algorithm.  

I will let you know if I have any questions.

The goal of the algorithm is to speed up convergence by l= imiting the convergence scope and expanding out 1 link at a time until all = nodes and links are part of the flood scope.  From the examples in the= slide deck I did not see mentioned what is done with the dynamic flooding algorithm where when you have a meshed n= etwork in the slide 5 examples, how do you limit the flooding on redundant = links duplicate flooding with the many meshed paths as you iteratively grow= the FT nodes scope Cq().  I believe with the dynamic flooding it does a degree of 2 so 2 links between nodes. =  
[HC]: The slide 5 example illustrates step 4 of the = algorithm in section 4.1. When the algorithm reaches this step, all the nod= es are  on the FT, but some of them may have degree of 1 (i.e., one li= nk on the FT connected to the node). This step makes sure that every node on the FT has degree of at least 2.  It se= ems that the dynamic flooding expects the FT having its every node with degree of at le= ast 2 for redundancy. In the Dynamic Flooding on Dense Graphs, link states will be flooded over the lin= ks on the FT. For example, for a node with degree of N (e.g., 3), when the = node receives a link state from one link on the FT, it will flood the link = state to the other N-1 (e.g., 3-1=3D2) links on the FT. 

I think with clos spine leaf the mesh is much more intens= ive and problematic with ECMP then a circular topology nodal mesh that resu= lts in duplicate redundant flooding that slows down convergence.  With= spine leaf it=92s like an X horizontal width axis and then depth is spine to leaf links.  With spine leaf as you g= row sideways and the spine expand the redundant ECMP grows and redundant fl= ooding grows exponentially and is much worse then circular nodal mesh. &nbs= p;
[HC]: In the slides, a full mess topology is used to illu= strate the algorithm in some details. The algorithm can be used to compute = FT for any other topology such as clos spine leaf. For topology with M (e.g= ., 100) parallel links between any pair of nodes X and Y, the algorithm will just add one link to the FT betw= een X and Y, the other M - 1 (e.g., 100-1 =3D 99) links will not be added t= o the FT. Thus the link states will flood over only this one link between X= and Y on the FT and will not flood over the other M - 1 (e.g., 100 - 1 =3D 99) links, which are not on the FT= .

Thank you 

Gyan

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Mon, 25 May 2020 02:25:41 +0000 From: Huaimo Chen To: Gyan Mishra CC: "Acee Lindem (acee)" , "lsr@ietf.org" Thread-Topic: [Lsr] Flooding Topology Computation Algorithm - draft-cc-lsr-flooding-reduction-08 Working Group Adoption Call Thread-Index: AQHWKvCWbO+rNwui80Sty0q3wo/aI6iuQDRQgAC6fICAAVrmiIAAx0uAgADIYX+AAL9sAIAAAVeagAA06ID//+MZAIAARoiA///qD4CAAHjEgIAAvJSBgAC7/oCAAAhqAIADKXWP Date: Mon, 25 May 2020 02:25:41 +0000 Message-ID: References: <63330FD6-EDE8-4938-AA85-948279C57E34@cisco.com> <424B17B1-D66D-4708-A819-855E972841AF@cisco.com> , In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: gmail.com; dkim=none (message not signed) header.d=none;gmail.com; dmarc=none action=none header.from=futurewei.com; x-originating-ip: [2601:199:4300:8e5a:74ce:8eb8:ed16:ceb1] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: 537dd6ba-cf56-42b3-aa07-08d80052ebc7 x-ms-traffictypediagnostic: MN2PR13MB4039: x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:10000; 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charset="Windows-1252" Content-Transfer-Encoding: quoted-printable Hi Gyan, Thanks much for your comments and suggestions. My answers/explanations = are inline below. Best Regards, Huaimo ________________________________ From: Gyan Mishra Sent: Friday, May 22, 2020 9:11 PM To: Huaimo Chen Cc: Acee Lindem (acee) ; lsr@ietf.org Subject: Re: [Lsr] Flooding Topology Computation Algorithm - draft-cc-lsr-f= looding-reduction-08 Working Group Adoption Call Hi Huaimo Thinking about physical topology a little further as with the FT algorithm = it makes sense to decouple the FT from the physical however the overall cov= erage is based on those basic parameters of degree number of links and node= s as well as width and depth of the topology. [HC]: We may add/think more about physical topology and reduce/simplify the= description about parameters in the draft. Thinking about it further the clos leaf spine DC style topology is much wor= se in terms of flooding due to physical topology that leafs don=92t physica= l connection and are interconnected via the spine creating massive ECMP and= overload of the spine super spine. So the physical DC leaf spine topology= really exacerbates the flooding due to the non full mesh nature of the top= ology. [HC]: You are right. The clos leaf spine topology is much worse. The algori= thm in the draft can be used to compute FT for the clos leaf spine topology= and reduce the number of links used for flooding significantly. With a service provider core which is typically a mesh style multi tier mul= tiple concentric circles mix of full and partial mesh and hub spoke type ph= ysical topologies. So with flooding with full mesh every node connects with every node so you = don=92t have an overload of flooding being funneled through a super spine a= s you do with a leaf spine DC architecture. So in a full mesh which is the= best case scenario for flooding perspective from my point of view which ea= ch node as root connects to all nodes and then you can iteratively grow the= flooding scope and it=92s pretty controlled and you can limit the redundan= t flooding. When the physical topology changes to a much more partially me= shed the ECMP paths grow astronomically as does the flooding and longer con= vergence time. So I think in the slide deck and draft look at scenario where their is trem= endous ECMP from partial meshing and how the flood reduction algorithm impr= oves the flooding and convergence. [HC]: They should have more scenarios including clos spine leafs. The reaso= n for not having them in the draft is that "drawing" topology of clos spine= leaf to illustrate the algorithm in details is very hard. Kind regards Gyan On Fri, May 22, 2020 at 8:41 PM Gyan Mishra > wrote: Hi Huaimo Thank you for the slide deck. That really helps understand the algorithm. I will let you know if I have any questions. The goal of the algorithm is to speed up convergence by limiting the conver= gence scope and expanding out 1 link at a time until all nodes and links ar= e part of the flood scope. From the examples in the slide deck I did not s= ee mentioned what is done with the dynamic flooding algorithm where when yo= u have a meshed network in the slide 5 examples, how do you limit the flood= ing on redundant links duplicate flooding with the many meshed paths as you= iteratively grow the FT nodes scope Cq(). I believe with the dynamic floo= ding it does a degree of 2 so 2 links between nodes. I think with clos spine leaf the mesh is much more intensive and problemati= c with ECMP then a circular topology nodal mesh that results in duplicate r= edundant flooding that slows down convergence. With spine leaf it=92s like= an X horizontal width axis and then depth is spine to leaf links. With sp= ine leaf as you grow sideways and the spine expand the redundant ECMP grows= and redundant flooding grows exponentially and is much worse then circular= nodal mesh. Thank you Gyan On Fri, May 22, 2020 at 10:05 AM Huaimo Chen > wrote: Hi Gyan, Thanks much for your questions. My answers/explanations are inline belo= w. Best Regards, Huaimo ________________________________ From: Gyan Mishra > Sent: Thursday, May 21, 2020 10:13 PM To: Acee Lindem (acee) > Cc: Huaimo Chen >; lsr@ietf.org > Subject: Re: [Lsr] Flooding Topology Computation Algorithm - draft-cc-lsr-f= looding-reduction-08 Working Group Adoption Call I think for both drafts it would be good to have a stick diagram at a minim= um. [HC]: A diagram for illustrating the steps of the algorithm is in Appendix. I majored in EE with math minor and both drafts are hard to follow without= a diagram with labels showing the exact topology examples. Four main topologies - full mesh, partial mesh and leaf spine ( 2 tier) and= CLOS ( 3 tier) - real world scenario=92s. >From the interim meeting was their a slide deck visual topology shared? [HC]: The set of slides presented in IETF 105 is attached. That would help. https://datatracker.ietf.org/doc/html/draft-cc-lsr-flooding-reduction-08 4.1 Step 1 - Build Cq candidate queue For each node B on FT whose D is one (from minimum to maximum node ID), find a link L attached to B such that L's remote node R has minimum D and ID, add link L between B and R into FT and increase B's D and R's D by one. Return FT. My interpretation is the algorithm an iterative loop and starts with any no= de in the candidate list so could start from edge and work left to right or= vice versa. For loop to build FT from Cq =3D with each node B with direct= ly attached node R via link L. Increment node B from Cq until the FT is bu= ild for all nodes. Instead of starting with a wide diameter FT matching ph= ysical topology we start micro topology with D=3D1 and go node by node. [HC]: This (For each node B on FT .... Return FT.) is an iterative loop aft= er every node is added to FT. This loop connects each node whose D =3D 1 (i= .e., there is only one link attached to it on FT) to a node through a link = on FT (i.e., add the link to FT) to make every node on FT to have its D > 1= . Page 5 of the attached slides shows some details for this loop. 4.2 1. Finding and removing the first element with node A in Cq that is not on FT and one PH's D in PHs < MaxD and PH's D < PH's ConMaxD. If A is root R0, then add the element into FT otherwise (i.e., A !=3D R0 with one PH's D in PHs < MaxD and PH's D < PH's ConMaxD. Assume that PH is the first one in PHs whose D < MaxD and PH's D < PH's ConMaxD), PH's D++, and add A with D =3D 1 and PHs =3D {PH} into FT. Note: if there is no element with a node in Cq satisfying the conditions, then algorithm may be restarted from R0, ++MaxD, Cq =3D {(R0,D=3D0,PHs =3D { })}, FT =3D { }; This is similar to 4.1 with micro topology with 2 directly connected nodes [HC]: It is similar to 1. in section 4.1. https://www.ietf.org/id/draft-chen-lsr-dynamic-flooding-algorithm-00.html My interpretation of the algorithm from the verbiage. So this draft starts in the middle of the topology and is geared towards le= af spine 2 or 3 tier clos topology. For this one we build the bi graph so that could be leaf connected to two s= pines or spine connected to two leafs and iteratively build out the FT topo= logy 3 node arch spine leaf spine or leaf spine leaf. Kind regards Gyan On Thu, May 21, 2020 at 7:01 PM Acee Lindem (acee) > wrote: Hi Gyan, From: Gyan Mishra > Date: Thursday, May 21, 2020 at 4:20 PM To: Acee Lindem > Cc: Huaimo Chen >, "lsr@ietf.org" > Subject: Re: [Lsr] Flooding Topology Computation Algorithm - draft-cc-lsr-f= looding-reduction-08 Working Group Adoption Call Yes and I have started reviewing the LSR mail archives as I am late in the = discussion for this. If you have link to any particular dates in the archives would be helpful. No =96 it was more an =93evolution=94 than an =93epiphany=94. That sums up all the questions I have so if all answered in the archives th= en I am all set. I support the draft moving forward as flood reduction is a much needed feat= ure. I think overall both drafts will really help large data centers with any ov= erlay underlay vxlan spine leaf meshed CLOS highly meshed topology that sca= les out horizontally with a large spine footprint - this is a much much nee= ded feature. This also helps eliminate complexity of the workaround of usi= ng BGP in the underlay which to me adds tremendous complexity. Here is the other recently presented dynamic flooding draft. https://datatracker.ietf.org/doc/draft-chen-lsr-dynamic-flooding-algorithm/= You can see they both make use of the dynamic flooding infra in https://dat= atracker.ietf.org/doc/draft-ietf-lsr-dynamic-flooding/ Thanks, Acee Kind regards Gyan On Thu, May 21, 2020 at 4:07 PM Acee Lindem (acee) > wrote: Speaking as WG Co-chair: Hi Gyan, I guess you=92ve joined this discussion late. It might be a good idea to re= view the LSR mailing list archives. From: Gyan Mishra > Date: Thursday, May 21, 2020 at 1:51 PM To: Huaimo Chen > Cc: Acee Lindem >, "lsr@ietf.org" > Subject: Re: [Lsr] Flooding Topology Computation Algorithm - draft-cc-lsr-f= looding-reduction-08 Working Group Adoption Call On Thu, May 21, 2020 at 11:01 AM Huaimo Chen > wrote: Hi Gyan, Thanks much for your questions. Gyan> How does this draft compare to the WG LC draft for flood reduction. = Would they be two eventual standard options in the operators toolbox or c= ompeting features for optimized flood reduction. Would having two flood red= uction features standardized versus one default IGP flood reduction feature= be confusing for operators. Just as it was confusing to me. https://datatracker.ietf.org/doc/draft-ietf-lsr-dynamic-flooding/ [HC]: This draft plus the draft for flooding reduction can provide two = modes of flooding reductions (i.e., centralized mode and distributed mode).= The latter describes the two modes, but does not include any flooding topo= logy computation algorithm for the distributed mode. The former proposes a = flooding topology computation algorithm to be used in the distributed mode. Gyan> It maybe a good idea for both documents to reference each other as= to how they play together or in some respects if any provide a homogeneou= s complete holistic solution for flooding problem being solved. It is a good idea to have this new draft reference the dynamic-flooding but= not vice-versa. The existing dynamic flooding draft provides a framework f= or any dynamic flooding algorithm that provides a separate flooding topolog= y. This algorithm is just the first to be formally proposed in a draft. Not= e that another algorithm was presented during the LSR virtual interim which= replaced IETF 107. In my opinion it may not be a bad idea even to combine both drafts so the s= olution is complete and holistic. This will also make the overall specific= ation flow nicely. No =96 we=92re not going to do this. Thanks, Acee I know that efforts were made by LSR to have a common IGP solution, however= there are many inherent differences between ISIS and OSPF that from IGP Li= nk state protocol perspective you can treat like apples to apples but reall= y it=92s apples and oranges. Maybe it might we wise to have separate draft= for both and have references linking together as the same algorithm concep= t and mathematically however the actual code implementation would vary as t= he LSDB link state data structures are completely different. Later =3D Dynamic flooding =3D 2 modes Centralized leader based and distrib= uted https://datatracker.ietf.org/doc/draft-ietf-lsr-dynamic-flooding/ This later draft per section excerpt provides both centralized and distribu= ted algorithm see below 6.4. A= rea Leader Responsibilities If the Area Leader operates in centralized mode, it MUST advertise algorithm 0 in its Area Leader Sub-TLV. In order for Dynamic Flooding to be enabled it also MUST compute and advertise a flooding topology for the area. The Area Leader may update the flooding topology at any time, however, it should not destabilize the network with undue or overly frequent topology changes. If the Area Leader operates in centralized mode and needs to advertise a new flooding topology, it floods the new flooding topology on both the new and old flooding topologies. If the Area Leader operates in distributed mode, it MUST advertise a non-zero algorithm in its Area Leader Sub-TLV. When the Area Leader advertises algorithm 0 in its Area Leader Sub- TLV and does not advertise a flooding topology, Dynamic Flooding is disabled for the area. Note this applies whether the Area Leader intends to operate in centralized mode or in distributed mode. Note that once Dynamic Flooding is enabled, disabling it risks destabilizing the network. 6.5= . Distributed Flooding Topology Calculation If the Area Leader advertises a non-zero algorithm in its Area Leader Sub-TLV, all nodes in the area that support Dynamic Flooding and the value of algorithm advertised by the Area Leader MUST compute the flooding topology based on the Area Leader's advertised algorithm. Nodes that do not support the value of algorithm advertised by the Area Leader MUST continue to use standard flooding mechanism as defined by the protocol. Nodes that do not support the value of algorithm advertised by the Area Leader MUST be considered as Dynamic Flooding incapable nodes by the Area Leader. If the value of the algorithm advertised by the Area Leader is from the range 128-254 (private distributed algorithms), it is the responsibi= lity of the network operator to guarantee that all nodes in the area have a common unde= rstanding of what the given algorithm value represents. Former =3D WG LC https://datatracker.ietf.org/doc/html/draft-cc-lsr-flooding-reduction-08 Provides algorithm for distributed mode for this draft as well as the algor= ithm to be used for distributed mode later dynamic flooding draft Separate question- In light of the flooding algorithm and seeing that at the bottom of section= 6.5 mentions flooding algorithm are the IANA codepoints reserved for flood= ing unique and non overlapping with the flex algo codepoints I believe 0-12= 7. I would think the flooding algorithm range of values is completely sepa= rate since a different function then flex algo values. https://datatracker.ietf.org/doc/html/draft-ietf-lsr-flex-algo-07 Best Regards, Huaimo ________________________________ From: Gyan Mishra > Sent: Thursday, May 21, 2020 10:36 AM To: Huaimo Chen > Cc: Acee Lindem (acee) >; lsr@ietf.org > Subject: Re: [Lsr] Flooding Topology Computation Algorithm - draft-cc-lsr-f= looding-reduction-08 Working Group Adoption Call On Wed, May 20, 2020 at 11:59 PM Huaimo Chen > wrote: Hi Gyan, Thanks much for your questions. My answers are inline below with [HC]. Best Regards, Huaimo ________________________________ From: Gyan Mishra > Sent: Wednesday, May 20, 2020 11:14 AM To: Huaimo Chen > Cc: Acee Lindem (acee) >; lsr@ietf.org > Subject: Re: [Lsr] Flooding Topology Computation Algorithm - draft-cc-lsr-f= looding-reduction-08 Working Group Adoption Call Huaimo This is a much needed feature that operators have been needing for densely = meshed topologies that commonly exist in data centers to accommodate very h= igh bandwidth E-W traffic. [HC]: Thank you very much. Below is link from Cisco which has introduced feature for dynamic flooding = in clos high density ECMP data center topologies. Please look at the feature description and it does seem to be exactly the s= ame as this draft. Please confirm. [HC]: It seems different. There maybe other vendors due to industry demand have to get the feature de= ployed before it reaches standards vendor consensus with the IETF. https://www.cisco.com/c/en/us/products/collateral/switches/nexus-9000-serie= s-switches/white-paper-c11-743015.html We are testing this feature and planning to deploy but wanted to ensure tha= t this is the same as the draft on the standards track. [HC]: The feature appears implemented draft "Dynamic Flooding on Dense Grap= hs", which does not include any flooding topology computation algorithm.. Gyan> How does this draft compare to the WG LC draft for flood reductio= n. Would they be two eventual standard options in the operators toolbox o= r competing features for optimized flood reduction. Would having two flood = reduction features standardized versus one default IGP flood reduction feat= ure be confusing for operators. Just as it was confusing to me. https://datatracker.ietf.org/doc/draft-ietf-lsr-dynamic-flooding/ Kind regards Gyan On Tue, May 19, 2020 at 11:52 PM Huaimo Chen > wrote: Hi Gyan, Thank you very much for your questions and support. This Flooding Topology Computation algorithm can be used in the Dynamic= Flooding on Dense Graphs to compute the flooding topologies for the data c= enter clos dense meshed topologies with many ECMP paths. It can be used by = the area leader in the centralized mode to compute the flooding topology. Best Regards, Huaimo ________________________________ From: Lsr > on behalf of = Gyan Mishra > Sent: Tuesday, May 19, 2020 2:39 AM To: Yanhe Fan > Cc: lsr@ietf.org >; = Acee Lindem (acee) > Subject: Re: [Lsr] Flooding Topology Computation Algorithm - draft-cc-lsr-f= looding-reduction-08 Working Group Adoption Call I support WG adoption and have a few questions related to the draft. Does this flooding algorithm use the dynamic flooding algorithm used in dat= a center clos dense meshed topologies with many ECMP paths where the flood = is decoupled from the physical topology. In the dynamic flooding algorithm= mentioned in centralized mode the flooding is computed by the area leader = and distributed to all nodes. In distributed mode each mode the area leade= r determines the algorithm and then each node computes the flooding topolog= y based on the algorithm. This dynamic algorithm for optimized flood reduction would reduce the amoun= t of redundant flooding in highly densely meshed ospf or Isis topologies. = So this optimization of flooding would improving overall link state routing= protocol convergence. Gyan On Mon, May 18, 2020 at 3:37 PM Yanhe Fan > wrote: Support it as a co-author. Thanks, Yanhe From: Lsr > On Behalf Of = Acee Lindem (acee) Sent: Friday, May 15, 2020 3:40 PM To: lsr@ietf.org Subject: [Lsr] Flooding Topology Computation Algorithm - draft-cc-lsr-flood= ing-reduction-08 Working Group Adoption Call This begins a 3 week (due to holidays) WG adoption call for the =93Flooding= Topology Computation Algorithm=94 draft. Please issue your support or obje= ction to this list by 11:59 PM, UTC on June 5th, 2020. Here is a URL for yo= ur convenience. https://datatracker.ietf.org/doc/draft-cc-lsr-flooding-reduction/ Thanks, Acee _______________________________________________ Lsr mailing list Lsr@ietf.org https://www.ietf.org/mailman/listinfo/lsr -- Error! Filename not specified. Gyan Mishra Network Solutions Ar= chitect M 301 502-1347 13101 Columbia Pike Silver Spring, MD -- Error! Filename not specified. Gyan Mishra Network Solutions Architect M 301 502-1347 13101 Columbia Pike<= https://nam11.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fwww.goo= gle.com%2Fmaps%2Fsearch%2F13101%2BColumbia%2BPike%2B%250D%250A%2BSilver%2BS= pring%2C%2BMD%3Fentry%3Dgmail%26source%3Dg&data=3D02%7C01%7Chuaimo.chen%40f= uturewei.com%7C4c12ec234b2a452db84408d7feb65044%7C0fee8ff2a3b240189c753a1d5= 591fedc%7C1%7C0%7C637257931307083424&sdata=3DKSSlepfFHvtyqtOAbwIAdqkXy9RF%2= FdOfo7%2FDz5RHp7k%3D&reserved=3D0> Silver Spring, MD -- Error! Filename not specified. Gyan Mishra Network Solutions Architect M 301 502-1347 13101 Columbia Pike Silver Spring, MD -- Error! Filename not specified. Gyan Mishra Network Solutions Architect M 301 502-1347 13101 Columbia Pike Silver Spring, MD -- [Image removed by sender.] Gyan Mishra Network Solutions Architect M 301 502-1347 13101 Columbia Pike Silver Spring, MD -- [http://ss7.vzw.com/is/image/VerizonWireless/vz-logo-email] Gyan Mishra Network Solutions Architect M 301 502-1347 13101 Columbia Pike Silver Spring, MD -- [http://ss7.vzw.com/is/image/VerizonWireless/vz-logo-email] Gyan Mishra Network Solutions Architect M 301 502-1347 13101 Columbia Pike Silver Spring, MD -- [http://ss7.vzw.com/is/image/VerizonWireless/vz-logo-email] Gyan Mishra Network Solutions Architect M 301 502-1347 13101 Columbia Pike Silver Spring, MD --_000_MN2PR13MB3117FEC5B0C03845F5B49A96F2B30MN2PR13MB3117namp_ Content-Type: text/html; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable
Hi Gyan,

    Thanks much for your comments and suggestions. My answers/exp= lanations are inline below.

Best Regards,
Huaimo
From: Gyan Mishra <hayab= usagsm@gmail.com>
Sent: Friday, May 22, 2020 9:11 PM
To: Huaimo Chen <huaimo.chen@futurewei.com>
Cc: Acee Lindem (acee) <acee@cisco.com>; lsr@ietf.org <lsr@= ietf.org>
Subject: Re: [Lsr] Flooding Topology Computation Algorithm - draft-c= c-lsr-flooding-reduction-08 Working Group Adoption Call
 
Hi Huaimo

Thinking about physical topology a little further as with= the FT algorithm it makes sense to decouple the FT from the physical howev= er the overall coverage is based on those basic parameters of degree number= of links and nodes as well as width and depth of the topology.
[HC]: We may add/think more about physical topology and reduce/simplify the description about parameters in the draft.

Thinking about it further the clos leaf spine DC style to= pology is much worse in terms of flooding due to physical topology that lea= fs don=92t physical connection and are interconnected via the spine creatin= g massive ECMP and overload of the spine super spine.  So the physical DC leaf spine topology really exacerbat= es the flooding due to the non full mesh nature of the topology.  
[HC]: You are right. The clos leaf spine topology is muc= h worse. The algorithm in the draft can be used to compute FT for the clos leaf spi= ne topology and reduce the number of links used for flooding significantly.=  

With a service provider core which is typically a mesh st= yle multi tier multiple concentric circles mix of full and partial mesh and= hub spoke type physical topologies.  

So with flooding with full mesh every node connects with = every node so you don=92t have an overload of flooding being funneled throu= gh a super spine as you do with a leaf spine DC architecture.  So in a= full mesh which is the best case scenario for flooding perspective from my point of view which each node as root con= nects to all nodes and then you can iteratively grow the flooding scope and= it=92s pretty controlled and you can limit the redundant flooding.  W= hen the physical topology changes to a much more partially meshed the ECMP paths grow astronomically as does the = flooding and longer convergence time.

So I think in the slide deck and draft look at scenario w= here their is tremendous ECMP from partial meshing and how the flood reduct= ion algorithm improves the flooding and convergence.
[HC]: They should have more scenarios including clos spine leafs. The reason for not having them in the draft is= that "drawing" topology of clos spine leaf to illustrate the alg= orithm in details is very hard. 

Kind regards 

Gyan 

On Fri, May 22, 2020 at 8:41 PM Gya= n Mishra <hayabusagsm@gmail.com= > wrote:
Hi Huaimo

Thank you for the slide deck.  That really helps und= erstand the algorithm.  

I will let you know if I have any questions.

The goal of the algorithm is to speed up convergence by l= imiting the convergence scope and expanding out 1 link at a time until all = nodes and links are part of the flood scope.  From the examples in the= slide deck I did not see mentioned what is done with the dynamic flooding algorithm where when you have a meshed n= etwork in the slide 5 examples, how do you limit the flooding on redundant = links duplicate flooding with the many meshed paths as you iteratively grow= the FT nodes scope Cq().  I believe with the dynamic flooding it does a degree of 2 so 2 links between nodes. =  

I think with clos spine leaf the mesh is much more intens= ive and problematic with ECMP then a circular topology nodal mesh that resu= lts in duplicate redundant flooding that slows down convergence.  With= spine leaf it=92s like an X horizontal width axis and then depth is spine to leaf links.  With spine leaf as you g= row sideways and the spine expand the redundant ECMP grows and redundant fl= ooding grows exponentially and is much worse then circular nodal mesh. &nbs= p;

Thank you 

Gyan

On Fri, May 22, 2020 at 10:05 AM Hu= aimo Chen <huaimo.chen@futurewei.com> wrote:
Hi Gyan,

    Thanks much for your questions. My answers/explanations are i= nline below.

Best Regards,
Huaimo
From: Gyan Mishra <hayabusagsm= @gmail.com>
Sent: Thursday, May 21, 202= 0 10:13 PM
To: Acee Lindem (acee) <= acee@cisco.com>
Cc: Huaimo Chen <huaimo.chen@futurewei.com>; lsr@ietf.org <lsr@ietf.org>
Subject: Re: [Lsr] Flooding= Topology Computation Algorithm - draft-cc-lsr-flooding-reduction-08 Workin= g Group Adoption Call
 

I think for both drafts it would be good to have a stick = diagram at a minimum.  
[HC]: A diagram for illustrating the steps of the algorit= hm is in Appendix.
I majored in EE with math  minor and both drafts are= hard to follow without a diagram with labels showing the exact topology ex= amples.  

Four main topologies - full mesh, partial mesh and leaf s= pine ( 2 tier) and CLOS ( 3 tier) - real world scenario=92s.

From the interim meeting was their a slide deck visual to= pology shared? 
[HC]: The set of slides presented in IETF 105 is attached= .

That would help.

4.1 

Step 1 - Build Cq candidate queue 

For each node B on FT whose D is one (from minimum to ma=
ximum=0A=
       node ID), find a link L attached to B such that L's remote node R=0A=
       has minimum D and ID, add link L between B and R into FT and=0A=
       increase B's D and R's D by one.  Return FT.
My interpretation is the algorithm an iterative loop and = starts with any node in the candidate list so could start from edge and wor= k left to right or vice versa.  For loop to build FT from Cq =3D with = each node B with directly attached node R via link L.  Increment node B from Cq until the FT is build for all n= odes.  Instead of starting with a wide diameter FT matching physical t= opology we start micro topology with D=3D1 and go node by node.
[HC]: This (For each node B on FT .... Return FT.) is&nbs= p;an iterative loop after every node is added to FT. This loop connects ea= ch node whose D =3D 1 (i.e., there is only one link attached to it on FT) to a node through a link on FT (i.e., add t= he link to FT) to make every node on FT to have its D > 1. Page 5 of the= attached slides shows some details for this loop.

4.2 

1.  Finding and removing the first element with node A i=
n Cq that is=0A=
       not on FT and one PH's D in PHs < MaxD and PH's D < PH's ConMa=
xD.=0A=
=0A=
       If A is root R0, then add the element into FT=0A=
=0A=
       otherwise  (i.e., A !=3D R0 with one PH's D in PHs < MaxD and PH'=
s=0A=
          D < PH's ConMaxD.  Assume that PH is the first one in PHs=0A=
          whose D < MaxD and PH's D < PH's ConMaxD), PH's D++=
, and add A=0A=
          with D =3D 1 and PHs =3D {PH} into FT.=0A=
=0A=
       Note:  if there is no element with a node in Cq satisfying the=0A=
          conditions, then algorithm may be restarted from R0, ++Ma=
xD,=0A=
          Cq =3D {(R0,D=3D0,PHs =3D { })}, FT =3D { };
This is similar to 4.1 with micro topology with 2 directl= y connected nodes 
[HC]: It is similar to 1. in section 4.1.

My interpretation of the algorithm from the verbiage.

So this draft starts in the middle of the topology and is= geared towards leaf spine 2 or 3 tier clos topology.

For this one we build the bi graph so that could be leaf = connected to two spines or spine connected to two leafs and iteratively bui= ld out the FT topology 3 node arch  spine leaf spine or leaf spine lea= f.

Kind regards 

Gyan

On Thu, May 21, 2020 at 7:01 PM Acee Lindem (acee) <acee@cisco.com> wro= te:

Hi Gyan,

 

From: Gyan Mishra <hayabusagsm@gmail.com&g= t;
Date: Thursday, May 21, 2020 at 4:20 PM
To: Acee Lindem <acee@cisco.com>
Cc: Huaimo Chen <huaimo.chen@futurewei.com>, "lsr@ietf.org" <lsr@ietf.org>
Subject: Re: [Lsr] Flooding Topology Computation Algorithm - draft-c= c-lsr-flooding-reduction-08 Working Group Adoption Call

 

 

Yes and I have started reviewing the LSR mai= l archives as I am late in the discussion for this.

 

If you have link to any particular dates in = the archives would be helpful.

 

No =96 it was more an =93evolution=94 than an =93epiphany=94. =

 

That sums up all the questions I have so if = all answered in the archives then I am all set.

 

I support the draft moving forward as flood = reduction is a much needed feature.  

 

I think overall both drafts will really help= large data centers with any overlay underlay vxlan spine leaf meshed CLOS = highly meshed topology that scales out horizontally with a large spine foot= print - this is a much much needed feature.  This also helps eliminate complexity of the workaround of u= sing BGP in the underlay which to me adds tremendous complexity.<= /u>

 

Here is the other recently presented dynamic flooding draft.

 

https://datatracker.ietf.org/doc/draft-chen-lsr-dynamic-floodi= ng-algorithm/

 

You can see they both make use of the dynamic flooding infra in https://datatracker.ietf.org/doc/draft-ietf-lsr-dynamic-flooding/

 

Thanks,

Acee

 

 

 

 

Kind regards 

 

Gyan 

 

On Thu, May 21, 2020 at 4:07 PM Acee Lindem = (acee) <acee@cisco.c= om> wrote:

Speaking as WG Co-chair:

 

Hi Gyan,

 

I guess you=92ve joined this discussion late= . It might be a good idea to review the LSR mailing list archives.

 

From: Gyan Mishra <hayabusagsm@gmail.com&g= t;
Date: Thursday, May 21, 2020 at 1:51 PM
To: Huaimo Chen <huaimo.chen@futurewei.com>
Cc: Acee Lindem <acee@cisco.com>, "lsr@ietf.org" <lsr@ietf.org>
Subject: Re: [Lsr] Flooding Topology Computation Algorithm - draft-c= c-lsr-flooding-reduction-08 Working Group Adoption Call

 

 

 

On Thu, May 21, 2020 at 11:01 AM Huaimo Chen &= lt;huaimo.ch= en@futurewei.com> wrote:

Hi= Gyan,

&n= bsp;

&n= bsp;   Thanks much for your questions.

&n= bsp;

&n= bsp;Gyan> How does this draft compare to the WG LC draft for flood reduc= tion.  Would they be two eventual standard options in the operators to= olbox  or competing features for optimized flood reduction. Would having two flood reduction features standardized versus o= ne default IGP flood reduction feature be confusing for operators.  Ju= st as it was confusing to me. 

https://datatracker.= ietf.org/doc/draft-ietf-lsr-dynamic-flooding/

&n= bsp;

&n= bsp;   [HC]: This draft plus the draft for flooding reduction can prov= ide two modes of flooding reductions (i.e., centralized mode and distribute= d mode). The latter describes the two modes, but does not include any flooding topology computation algorithm for the distr= ibuted mode. The former proposes a flooding topology computation algorithm to be used in the distributed m= ode.  

 

   Gyan> It maybe a good idea for= both documents to reference each other as to how they play together or &nb= sp;in some respects if any provide a homogeneous complete holistic solution= for flooding problem being solved.  

 

It is a good idea to have this new draft ref= erence the dynamic-flooding but not vice-versa. The existing dynamic floodi= ng draft provides a framework for any dynamic flooding algorithm that provi= des a separate flooding topology. This algorithm is just the first to be formally proposed in a draft. Note = that another algorithm was presented during the LSR virtual interim which r= eplaced IETF 107.  

 

In my opinion it may not be a bad idea even to= combine both drafts so the solution is complete and holistic.  This w= ill also make the overall specification flow nicely.  

 

No =96 we=92re not going to do this. =

 

Thanks,

Acee

 

I know that efforts were made by LSR to have a= common IGP solution, however there are many inherent differences between I= SIS and OSPF that from IGP Link state protocol perspective you can treat li= ke apples to apples but really it=92s apples and oranges.  Maybe it might we wise to have separate draft fo= r both and have references linking together as the same algorithm concept a= nd mathematically however the actual code implementation would vary as the = LSDB link state data structures are completely different. 

 

Later =3D Dynamic flooding =3D 2 modes Central= ized leader based and distributed 

 

This later draft per section excerpt provides = both centralized and distributed algorithm see below 

 

6.4.  Area Leader Responsibilities
 
   If the Area Leader operates in ce=
ntralized mode, it MUST advertise=

   algorithm 0 in its Area Leader Su=
b-TLV.  In order for Dynamic=

   Flooding to be enabled it also MU=
ST compute and advertise a flooding
   topology for the area.  The =
Area Leader may update the flooding
   topology at any time, however, it=
 should not destabilize the network
   with undue or overly frequent top=
ology changes.  If the Area Leader
   operates in centralized mode and =
needs to advertise a new flooding=

   topology, it floods the new flood=
ing topology on both the new and old
   flooding topologies.

 


   If the Area Leader operates in di=
stributed mode, it MUST advertise a


   non-zero algorithm in its Area Le=
ader Sub-TLV.


 


   When the Area Leader advertises a=
lgorithm 0 in its Area Leader Sub-


   TLV and does not advertise a floo=
ding topology, Dynamic Flooding is


   disabled for the area.  Note=
 this applies whether the Area Leader


   intends to operate in centralized=
 mode or in distributed mode.=



 


   Note that once Dynamic Flooding i=
s enabled, disabling it risks=



   destabilizing the network.=
<=
/u>


 


6.5.  Distributed Flooding Topology Calculation=



 


   If the Area Leader advertises a n=
on-zero algorithm in its Area Leader


   Sub-TLV, all nodes in the area th=
at support Dynamic Flooding and the


   value of algorithm advertised by =
the Area Leader MUST compute the<=
/u>


   flooding topology based on the Ar=
ea Leader's advertised algorithm.=



 


   Nodes that do not support the val=
ue of algorithm advertised by the=



   Area Leader MUST continue to use =
standard flooding mechanism as


   defined by the protocol.


 


   Nodes that do not support the val=
ue of algorithm advertised by the=



   Area Leader MUST be considered as=
 Dynamic Flooding incapable nodes by


   the Area Leader.

 


   If the value of the algorithm adv=
ertised by the Area Leader is from


   the range 128-254 (private distri=
buted algorithms), it is the responsibility of the 


network operator=
 to guarantee that all nodes in the area have a common understanding of wha=
t the given algorithm value represents.


 =

Former =3D WG LC 

Provides algorithm for distributed mode for th= is draft as well as the algorithm to be used for distributed mode later dyn= amic flooding draft 

 

Separate question-

 

In light of the flooding algorithm and seeing = that at the bottom of section 6.5 mentions flooding algorithm are the IANA = codepoints reserved for flooding unique and non overlapping with the flex a= lgo codepoints I believe 0-127.  I would think the flooding algorithm range of values is completely separate = since a different function then flex algo values.

 

&n= bsp;

Be= st Regards,

Hu= aimo

From: Gyan Mishra <hayabusagsm@gmail.com>
Sent: Thursday, May 21, 2020 10:36 AM


To: Huaimo Chen <huaimo.chen@futurewei.com>
Cc: Acee Lindem (acee) <acee=3D40cisco.com@dmarc.ietf.org>; lsr@ietf.org <lsr@ietf.org>
Subject: Re: [Lsr] Flooding Topology Computation Algorithm - draft-c= c-lsr-flooding-reduction-08 Working Group Adoption Call

 

 

 

On Wed, May 20, 2020 at 11:59 PM Huaimo Chen &= lt;huaimo.ch= en@futurewei.com> wrote:

Hi= Gyan,

&n= bsp;

&n= bsp;   Thanks much for your questions. My answers are inline below wit= h [HC].

&n= bsp;

Be= st Regards,

Hu= aimo

From: Gyan Mishra <hayabusagsm@gmail.com>
Sent: Wednesday, May 20, 2020 11:14 AM
To: Huaimo Chen <huaimo.chen@futurewei.com>
Cc: Acee Lindem (acee) <acee=3D40cisco.com@dmarc.ietf.org>; lsr@ietf.org <lsr@ietf.org>
Subject: Re: [Lsr] Flooding Topology Computation Algorithm - draft-c= c-lsr-flooding-reduction-08 Working Group Adoption Call

 

Huaimo 

 

This is a much needed feature that operators h= ave been needing for densely meshed topologies that commonly exist in data = centers to accommodate very high bandwidth E-W traffic.

[HC]: Thank you very much.

 

Below is link from Cisco which has introduced = feature for dynamic flooding in clos high density ECMP data center topologi= es.

 

Please look at the feature description and it = does seem to be exactly the same as this draft.  Please confirm. =

[HC]: It seems different. <= /p>

 

There maybe other vendors due to industry dema= nd have to get the feature deployed before it reaches standards vendor cons= ensus with the IETF.

 

 

We are testing this feature and planning to de= ploy but wanted to ensure that this is the same as the draft on the standar= ds track.

[HC]: The feature appears implemented draft "Dynamic Flooding on Dense Graph= s", which does not include any flooding topology computation algorithm= .. 

 

    Gyan> How does this draft com= pare to the WG LC draft for flood reduction.  Would they be two eventu= al standard options in the operators toolbox  or competing features fo= r optimized flood reduction. Would having two flood reduction features standardized versus one default IGP flood reduction feature be co= nfusing for operators.  Just as it was confusing to me.<= /p>

 

 

Kind regards 

 

Gyan

 

 

On Tue, May 19, 2020 at 11:52 PM Huaimo Chen &= lt;huaimo.ch= en@futurewei.com> wrote:

Hi Gyan,

&n= bsp;

    Thank you very much for your ques= tions and support.

&n= bsp;

    This Flooding Topology Computation algorithm can be used in the Dynamic Flooding on Dense Graphs to compute the floodin= g topologies for the data center clos dense meshed topologies with man= y ECMP paths. It can be used by the area leader in the centralized mode to = compute the flooding topology.   

 

Best Regards,

Huaimo

From: Lsr <lsr-bounces@ietf.org> on behalf of Gyan Mishra = <hayabusagsm@= gmail.com>
Sent: Tuesday, May 19, 2020 2:39 AM
To: Yanhe Fan <yfan@casa-systems.com>
Cc: lsr@ietf.org <lsr@ietf.org&g= t;; Acee Lindem (acee) <acee=3D40cisco.com@dmarc.ietf.org>
Subject: Re: [Lsr] Flooding Topology Computation Algorithm - draft-c= c-lsr-flooding-reduction-08 Working Group Adoption Call

 

 

I support WG adoption and have a few questions= related to the draft.

 

Does this flooding algorithm use the dynamic f= looding algorithm used in data center clos dense meshed topologies with man= y ECMP paths where the flood is decoupled from the physical topology. = In the dynamic flooding algorithm mentioned in centralized mode the flooding is computed by the area leader and distri= buted to all nodes.  In distributed mode each mode the area leader det= ermines the algorithm and then each node computes the flooding topology bas= ed on the algorithm.  

 

This dynamic algorithm for optimized flood red= uction would reduce the amount of redundant flooding in highly densely mesh= ed ospf or Isis topologies.  So this optimization of flooding would im= proving overall link state routing protocol convergence.

 

Gyan 

 

On Mon, May 18, 2020 at 3:37 PM Yanhe Fan <= yfan@casa-system= s.com> wrote:

Support it as a co-author.

 

Thanks,

Yanhe

______________________________________________= _
Lsr mailing list
Lsr@ietf.org
https://www.ietf.org/mailman/listinfo/lsr=

--

Er= ror! Filename not specified.

<= span style=3D"font-family:Arial,sans-serif; color:black">Gyan Mishra

= Network Solutions Architect 

<= span style=3D"font-family:Georgia,serif; color:black">M 301 502-1347
13101 Columbia Pike 
Silver Spring, MD

 

--

Erro= r! Filename not specified.

<= span style=3D"font-family:Arial,sans-serif; color:black">Gyan Mishra=

<= span style=3D"font-family:Georgia,serif; color:black">Network Solutions Arc= hitect 

<= span style=3D"font-family:Georgia,serif; color:black">M 301 502-1347
13101 Columbia Pike 
Sil= ver Spring, MD

 

--

<= span style=3D"font-family:Arial,sans-serif; color:black">Gyan Mishra=

<= span style=3D"font-family:Georgia,serif; color:black">Network Solutions Arc= hitect 

<= span style=3D"font-family:Georgia,serif; color:black">M 301 502-1347
13101 Columbia Pike 
Silver Spring, MD

 

--

<= span style=3D"font-family:Arial,sans-serif; color:black">Gyan Mishra=

<= span style=3D"font-family:Georgia,serif; color:black">Network Solutions Arc= hitect 

<= span style=3D"font-family:Georgia,serif; color:black">M 301 502-1347
13= 101 Columbia Pike 
Silver Spring, MD

 

=

--

3D"Image

Gyan Mishra

Network Solutions A= rchitect =

M 301 502-1347
13101 Columbia Pike 
Silver Spring, MD

 

<= /a>
--
--

=

Gyan Mishra

Network Solutio= ns Architect&= nbsp;

M 301 502-1347
13101 Columbia Pike 
Silver Spring, MD


--

Gyan Mishra

Network Solutio= ns Architect&= nbsp;

M 301 502-1347
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Mon, 25 May 2020 02:50:02 +0000 From: Huaimo Chen To: Gyan Mishra CC: "Acee Lindem (acee)" , "lsr@ietf.org" Thread-Topic: [Lsr] Flooding Topology Computation Algorithm - draft-cc-lsr-flooding-reduction-08 Working Group Adoption Call Thread-Index: AQHWKvCWbO+rNwui80Sty0q3wo/aI6iuQDRQgAC6fICAAVrmiIAAx0uAgADIYX+AAL9sAIAAAVeagAA06ID//+MZAIAARoiA///qD4CAAHjEgIAAvJSBgAC7/oCAAAXCgIABSiKAgAGv54CAAEJoMg== Date: Mon, 25 May 2020 02:50:02 +0000 Message-ID: References: <63330FD6-EDE8-4938-AA85-948279C57E34@cisco.com> <424B17B1-D66D-4708-A819-855E972841AF@cisco.com> <331DE9C9-BF8A-483D-B4D5-366D3FBF4C22@tony.li> , In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: gmail.com; dkim=none (message not signed) header.d=none;gmail.com; dmarc=none action=none header.from=futurewei.com; x-originating-ip: [2601:199:4300:8e5a:74ce:8eb8:ed16:ceb1] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: 2b747fcc-080f-4a65-9519-08d800565294 x-ms-traffictypediagnostic: MN2PR13MB3992: x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:10000; 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charset="Windows-1252" Content-Transfer-Encoding: quoted-printable Hi Gyan, Gyan> I know we are trying to adopt an flooding algorithm and from my reading up on all proposed algorithms, the dynamic flooding see= ms to be geared towards Data Center partial mesh high x ECMP leaf spine ar= chitecture, where redundant flooding is problematic using either centralize= d area leader or distributed flooding using same dynamic algorithm, versus= the call for adoption flood reduction algorithm seems to geared towards fu= ll mesh but from what I can tell would not be the preferred for clos multi = tier DC leaf spine topology with high x ECMP paths. [HC]: The algorithm in the call for adoption is also for (or say, gear towa= rds) clos multi tier DC leaf spine topology with high x ECMP paths. In the = Appendix of the draft, a full mess example topology of 5 nodes is used to i= llustrate the steps of the algorithm in some details. Using this topology i= s for easily "drawing" it and illustrating the steps of the algorithm. "Dra= wing" a clos multi tier DC leaf spine topology high x ECMP paths to illustr= ate the algorithm in details is very hard in the draft. Best Regards, Huaimo ________________________________ From: Gyan Mishra Sent: Sunday, May 24, 2020 6:29 PM To: Sarah Chen ; tony.li@tony.li Cc: Acee Lindem (acee) ; Huaimo Chen ; lsr@ietf.org Subject: Re: [Lsr] Flooding Topology Computation Algorithm - draft-cc-lsr-f= looding-reduction-08 Working Group Adoption Call Hi Acee Do you know if the dynamic flooding algorithm discussed during interim ietf= by Sarah and Toni is the same as the one implemented by Cisco on Nexus pla= tform or is Cisco=92s Dynamic flooding a proprietary implementation? Cisco=92s flooding algorithm does seem almost identical to dynamic flooding= . Cisco Dynamic flooding - Nexus 9k https://www.cisco.com/c/en/us/products/collateral/switches/nexus-9000-serie= s-switches/white-paper-c11-743015.html Dynamic Flooding - Arista - Sarah & Toni https://www.ietf.org/id/draft-chen-lsr-dynamic-flooding-algorithm-00.html Flood reduction- H Chen - WG adoption pending https://datatracker.ietf.org/doc/html/draft-cc-lsr-flooding-reduction-08 I know we are trying to adopt an flooding algorithm and from my reading up on all proposed algorithms, the dynamic flooding see= ms to be geared towards Data Center partial mesh high x ECMP leaf spine ar= chitecture, where redundant flooding is problematic using either centralize= d area leader or distributed flooding using same dynamic algorithm, versus= the call for adoption flood reduction algorithm seems to geared towards fu= ll mesh but from what I can tell would not be the preferred for clos multi = tier DC leaf spine topology with high x ECMP paths. Why would we not want to adopt the best algorithm that is best for both ful= l mesh and non full mesh leaf spine topology algorithm that works for all p= hysical topologies and adopt that draft. Unless a one size fits all won=92t work I would like to understand why one = best solution draft we come up with for an FT algorithm for all possible ph= ysical topologies cannot be picked for WG adoption. Why would we want to adopt multiple flooding algorithms? Gyan On Sat, May 23, 2020 at 4:43 PM Gyan Mishra > wrote: On Fri, May 22, 2020 at 9:02 PM > w= rote: Hi Gyan, I think with clos spine leaf the mesh is much more intensive and problemati= c with ECMP then a circular topology nodal mesh that results in duplicate r= edundant flooding that slows down convergence. With spine leaf it=92s like= an X horizontal width axis and then depth is spine to leaf links. With sp= ine leaf as you grow sideways and the spine expand the redundant ECMP grows= and redundant flooding grows exponentially and is much worse then circular= nodal mesh. One very nice thing about dynamic flooding is that it computes a flooding t= opology at the node level. If the adjacency between A and B is on the floo= ding topology, then any single link between them may be used for flooding. = If you have 128 way parallel links, this is an immediate 128x improvement = in flooding overhead. What=92s more, A and B do not need to agree on which= link they are using and can use different links, resulting in an asymmetri= c situation, without any loss of correctness or performance. Gyan>. Agreed. The dynamic flooding really helps with X way ECMP preval= ent in high density data center clos multi tier leaf spine parial mesh topo= logies that scale massive bandwidth breadth wise horizontally for E-W flows= . Regards, Tony -- [http://ss7.vzw.com/is/image/VerizonWireless/vz-logo-email] Gyan Mishra Network Solutions Architect M 301 502-1347 13101 Columbia Pike Silver Spring, MD -- [http://ss7.vzw.com/is/image/VerizonWireless/vz-logo-email] Gyan Mishra Network Solutions Architect M 301 502-1347 13101 Columbia Pike Silver Spring, MD --_000_MN2PR13MB3117B809AB72C7C07CEA959AF2B30MN2PR13MB3117namp_ Content-Type: text/html; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable
Hi Gyan,

Gyan> I know we are trying to adopt an flooding algorithm
and from my reading up on all proposed algorithms, the dynamic= flooding seems to be geared towards Data Center  partial mesh high x = ECMP leaf spine architecture, where redundant flooding is problematic using= either centralized area leader or distributed flooding using same dynamic algorithm,  versus the call for adoption = flood reduction algorithm seems to geared towards full mesh but from what I= can tell would not be the preferred for clos multi tier DC leaf spine topo= logy with high x ECMP paths.

[HC]: The algorithm in the call for adoption is also for (or say, gear= towards) clos multi tier DC leaf spine topology with high x ECMP paths. In= the Appendix of the draft, a full mess example topology of 5 nodes is used= to illustrate the steps of the algorithm in some details. Using this topology is for easily "drawing" it = and illustrating the steps of the algorithm. "Drawing" a clos multi tier DC leaf spine topology high x ECMP paths to illustrate the algorithm in det= ails is very hard in the draft. 

Best Regards,
Huaimo
From: Gyan Mishra <hayab= usagsm@gmail.com>
Sent: Sunday, May 24, 2020 6:29 PM
To: Sarah Chen <sarahchen@arista.com>; tony.li@tony.li <ton= y.li@tony.li>
Cc: Acee Lindem (acee) <acee@cisco.com>; Huaimo Chen <huaim= o.chen@futurewei.com>; lsr@ietf.org <lsr@ietf.org>
Subject: Re: [Lsr] Flooding Topology Computation Algorithm - draft-c= c-lsr-flooding-reduction-08 Working Group Adoption Call
 
Hi Acee

Do you know if the dynamic flooding algorithm discussed d= uring interim ietf by Sarah and Toni is the same as the one implemented by = Cisco on Nexus platform or is Cisco=92s Dynamic flooding a proprietary impl= ementation?

Cisco=92s flooding algorithm does seem almost identical t= o dynamic flooding.

Cisco Dynamic flooding - Nexus 9k


Dynamic Flooding - Arista - Sarah & Toni

Flood reduction- H Chen - WG adoption pending 



I know we are trying to adopt an flooding algorithm =
and from my reading up on all proposed algorithms, the dy= namic flooding seems to be geared towards Data Center  partial mesh hi= gh x ECMP leaf spine architecture, where redundant flooding is problematic = using either centralized area leader or distributed flooding using same dynamic algorithm,  versus the call f= or adoption flood reduction algorithm seems to geared towards full mesh but= from what I can tell would not be the preferred for clos multi tier DC lea= f spine topology with high x ECMP paths.

Why would we not want to adopt the best algorithm that is= best for both full mesh and non full mesh leaf spine topology algorithm th= at works for all physical topologies and adopt that draft.  

Unless a one size fits all won=92t work I would like to u= nderstand why one best solution draft we come up with for an FT algorithm f= or all possible physical topologies cannot be picked for WG adoption.

Why would we want to adopt multiple flooding algorithms?<= /div>

Gyan

On Sat, May 23, 2020 at 4:43 PM Gya= n Mishra <hayabusagsm@gmail.com= > wrote:


On Fri, May 22, 2020 at 9:02 PM <= ;tony.li@tony.li&g= t; wrote:

Hi Gyan,

I think with clos spine leaf the mesh is much more intensive and problemati= c with ECMP then a circular topology nodal mesh that results in duplicate r= edundant flooding that slows down convergence.  With spine leaf it=92s= like an X horizontal width axis and then depth is spine to leaf links.  With spine leaf as you grow sideways a= nd the spine expand the redundant ECMP grows and redundant flooding grows e= xponentially and is much worse then circular nodal mesh.  

One very nice thing about dynamic flooding is that it computes a flood= ing topology at the node level.  If the adjacency between A and B is o= n the flooding topology, then any single link between them may be used for = flooding.  If you have 128 way parallel links, this is an immediate 128x improvement in flooding overhead.  W= hat=92s more, A and B do not need to agree on which link they are using and= can use different links, resulting in an asymmetric situation, without any= loss of correctness or performance. 

   Gyan>. Agreed.  The dynamic flooding= really helps with X way ECMP prevalent in high density data center clos mu= lti tier leaf spine parial mesh topologies that scale massive bandwidth bre= adth wise horizontally for E-W flows.

Regards,
Tony

--
--
--_000_MN2PR13MB3117B809AB72C7C07CEA959AF2B30MN2PR13MB3117namp_-- From nobody Tue May 26 01:27:00 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id AF2373A0CDF; Tue, 26 May 2020 01:26:30 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -9.601 X-Spam-Level: X-Spam-Status: No, score=-9.601 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIMWL_WL_MED=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, SPF_PASS=-0.001, URIBL_BLOCKED=0.001, USER_IN_DEF_DKIM_WL=-7.5] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=cisco.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id q82SVXYj98li; Tue, 26 May 2020 01:26:29 -0700 (PDT) Received: from aer-iport-3.cisco.com (aer-iport-3.cisco.com [173.38.203.53]) (using TLSv1.2 with cipher DHE-RSA-SEED-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id EA0533A0CE0; Tue, 26 May 2020 01:26:27 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=5400; q=dns/txt; s=iport; t=1590481588; x=1591691188; h=subject:to:cc:references:from:message-id:date: mime-version:in-reply-to:content-transfer-encoding; bh=FHUC5ArbowdmmKcnpnjwJG98OqQojkNtVtgyzklxQ6c=; b=E79d9ZE/NOdkBCH3t6SSpyL0r0/fYxMpf5XHK2v//Gr7IKc8Mbu7uhbl gAEMmiprzOwh7KBYGRdvboHqa8a4gpJsJeJjuTDDa2KNV5blf3a2fHhAV L9e2hYq8l0fdjXm+WMvTsXSz2ruT2j/6ldWlKjgcU6mWOYFNaIlm2Dp8e 8=; X-IronPort-AV: E=Sophos;i="5.73,436,1583193600"; d="scan'208";a="24185331" Received: from aer-iport-nat.cisco.com (HELO aer-core-2.cisco.com) ([173.38.203.22]) by aer-iport-3.cisco.com with ESMTP/TLS/DHE-RSA-SEED-SHA; 26 May 2020 08:26:26 +0000 Received: from [10.60.140.51] (ams-ppsenak-nitro2.cisco.com [10.60.140.51]) by aer-core-2.cisco.com (8.15.2/8.15.2) with ESMTP id 04Q8QObI019220; Tue, 26 May 2020 08:26:25 GMT To: Alvaro Retana , Benjamin Kaduk Cc: Acee Lindem , draft-ietf-isis-mpls-elc@ietf.org, The IESG , lsr-chairs@ietf.org, lsr@ietf.org References: <158992828112.6026.1646593855480055081@ietfa.amsl.com> <1242ad52-bb48-8526-b65b-d413e0cd9e25@cisco.com> <20200521193856.GJ58497@kduck.mit.edu> From: Peter Psenak Message-ID: <63cbb2b2-e7ec-3077-ab4d-258ce95e6ef7@cisco.com> Date: Tue, 26 May 2020 10:26:24 +0200 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:60.0) Gecko/20100101 Thunderbird/60.7.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit X-Outbound-SMTP-Client: 10.60.140.51, ams-ppsenak-nitro2.cisco.com X-Outbound-Node: aer-core-2.cisco.com Archived-At: Subject: Re: [Lsr] Benjamin Kaduk's Discuss on draft-ietf-isis-mpls-elc-12: (with DISCUSS and COMMENT) X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 26 May 2020 08:26:31 -0000 Hi Alvaro, please see inline (##PP) On 22/05/2020 16:59, Alvaro Retana wrote: > On May 21, 2020 at 3:39:03 PM, Benjamin Kaduk wrote: > > > Peter: > > Hi! > > >> With respect to Alvaro's clarification, your answer for (1) makes sense; >> thanks! I think Alvaro has offered to help work out what (if any) >> additional text we might want to be sure that the answer to (2) is clear in >> the document. > > I think that #1 is where some clarification could be useful. :-) > > > I'm including both ISIS and OSPF suggestions below to consolidate the > discussion. > > > ... >>> My interpretation of Ben's question is two-fold: >>> >>> (1) Would ISIS routers normally propagate the information to a >>> different level? The ELC is a new prefix attribute flag -- are prefix >>> attributes always propagated (unchanged) to other levels? If so, then >>> the requirement (MUST) is not needed. My reading of rfc7794 is that >>> the propagation is optional... >> >> depends on the attribute or a bit. Some are propagated some are not. >> That's why we are saying this one MUST be preserved. > > Right. > > For ISIS I think the current text is in line with the specification of > the other bits in rfc7794.  No changes are needed. > > If anything, you may want to change the order of this sentence to > address Ben's comment: > > OLD> >    When a router propagates a prefix between ISIS levels ([RFC5302], it >    MUST preserve the ELC signaling for this prefix. > > NEW> >    The ELC signaling MUST be preserved when a router propagates a prefix >    between ISIS levels ([RFC5302]). > > [Similar for OSPF.] ##PP done. > > > > I think that for OSPF it is not that simple... > > For OSPFv2: rfc7684 says that the "scope of the OSPFv2 Extended Prefix > Opaque LSA depends on the scope of the advertised prefixes", which I > assume means that for intra-area prefixes the scope will be > area-local...so the ABR wouldn't simply propagate it; it would have to > originate a new LSA. ##PP correct. It is always a new LSA that ABR needs to generate. Here it's actually two LSAs. > > Suggestion (Add to 3.1)> >    When an OSPFv2 Area Border Router (ABR) distributes information between >    connected areas it SHOULD originate an OSPFv2 Extended Prefix Opaque LSA >    [RFC7684] including the received ELC setting.  If the received information >    is included in an LSA with an AS-wide scope, then the new LSA is not needed. Here's my suggestion for OSPFv2 ABR related text: "The ELC signaling MUST be preserved when an OSPF Area Border Router (ABR) distributes information between connected areas. To do so, ABR MUST originate an OSPFv2 Extended Prefix Opaque LSA [RFC7684] including the received ELC setting." Here's my suggested text for OSPFv2 ASBR case: "When an OSPF Autonomous System Boundary Router (ASBR) redistributes a prefix from another instance of OSPF or from some other protocol, it SHOULD preserve the ELC signaling for the prefix if it exists. To do so, ASBR SHOULD originate Extended Prefix Opaque LSA [RFC7684] including the ELC setting of the redistributed prefix. The flooding scope of the Extended Prefix Opaque LSA MUST match the flooding scope of the LSA that ASBR originates as a result of the redistribution. The exact mechanism used to exchange ELC between protocol instances on the ASBR is outside of the scope of this document." > > > For OSPFv3: The PrefixOptions are *in* the LSA, but I couldn't find > anything in rfc5340 saying that the received values should be copied > into the Inter-Area-Prefix-LSA (nor that they should not). > > Suggestion (Add to 3.2)> >    When an OSPFv3 Area Border Router (ABR) distributes information between >    connected areas, the setting of the ELC Flag in the Inter-Area-Prefix-LSA >    MUST be the same as the received value. Here's my suggestion for OSPFv3 ABR and ASBR: "The ELC signaling MUST be preserved when an OSPFv3 Area Border Router (ABR) distributes information between connected areas. The setting of the ELC Flag in the Inter-Area-Prefix-LSA [RFC5340] or in the Inter-Area-Prefix TLV [RFC8362], generated by ABR, MUST be the same as the value the ELC Flag associated with the prefix in the source area." "When an OSPFv3 Autonomous System Boundary Router (ASBR) redistributes a prefix from another instance of OSPFv3 or from some other protocol, it SHOULD preserve the ELC signaling for the prefix if it exists. The setting of the ELC Flag in the AS-External-LSA [RFC5340] or in the External-Prefix TLV [RFC8362], generated by ASBR, MUST be the same as the value the ELC Flag associated with the prefix in the source domain. The exact mechanism used to exchange ELC between protocol instances on the ASBR is outside of the scope of this document." thanks, Peter > > > > >>> (2) If the propagation is not automatic, and the L1L2 router doesn't >>> support this specification, then what are the drawbacks/failure >>> scenarios? IOW, for multi-level operation is it a requirement that >>> the L1L2 support this specification? >> >> drawback are identical to what is mentioned in the Security >> Considerations section. > > I think that text is ok. > > > Thanks! > > Alvaro. > > From nobody Tue May 26 01:59:11 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 0A8EF3A0D23; Tue, 26 May 2020 01:58:56 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -9.601 X-Spam-Level: X-Spam-Status: No, score=-9.601 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIMWL_WL_MED=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, SPF_PASS=-0.001, URIBL_BLOCKED=0.001, USER_IN_DEF_DKIM_WL=-7.5] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=cisco.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id vi-JHJPtn2Gd; Tue, 26 May 2020 01:58:53 -0700 (PDT) Received: from aer-iport-1.cisco.com (aer-iport-1.cisco.com [173.38.203.51]) (using TLSv1.2 with cipher DHE-RSA-SEED-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id F03A13A0D21; Tue, 26 May 2020 01:58:52 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=11350; q=dns/txt; s=iport; t=1590483533; x=1591693133; h=subject:to:cc:references:from:message-id:date: mime-version:in-reply-to:content-transfer-encoding; bh=J8weHPcBhKCcHd19Ab5ExUBK7rv9Pcc8OoBv3U2PdFY=; b=TaUABziLSrlYQZqdNIFrNWioI9AxwO4RFn+ivf+WDDwUQXYSGJmRvcIn c14qQjdaoJ2z5xGZfea1sBYiczTNTLlLLbWkBGm1w8ncjZtS6TABqrBqu 14bAXrqTGMkzScTNkFqbvGEdwg3lrURgib7AYRjCcGeDbSwSX5o95/IIi k=; X-IronPort-AV: E=Sophos;i="5.73,436,1583193600"; d="scan'208";a="26516596" Received: from aer-iport-nat.cisco.com (HELO aer-core-4.cisco.com) ([173.38.203.22]) by aer-iport-1.cisco.com with ESMTP/TLS/DHE-RSA-SEED-SHA; 26 May 2020 08:58:51 +0000 Received: from [10.60.140.51] (ams-ppsenak-nitro2.cisco.com [10.60.140.51]) by aer-core-4.cisco.com (8.15.2/8.15.2) with ESMTP id 04Q8wocI029675; Tue, 26 May 2020 08:58:50 GMT To: Benjamin Kaduk Cc: The IESG , draft-ietf-isis-mpls-elc@ietf.org, lsr-chairs@ietf.org, lsr@ietf.org, Acee Lindem , aretana.ietf@gmail.com References: <158992828112.6026.1646593855480055081@ietfa.amsl.com> <1242ad52-bb48-8526-b65b-d413e0cd9e25@cisco.com> <20200521193856.GJ58497@kduck.mit.edu> From: Peter Psenak Message-ID: Date: Tue, 26 May 2020 10:58:50 +0200 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:60.0) Gecko/20100101 Thunderbird/60.7.0 MIME-Version: 1.0 In-Reply-To: <20200521193856.GJ58497@kduck.mit.edu> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-Outbound-SMTP-Client: 10.60.140.51, ams-ppsenak-nitro2.cisco.com X-Outbound-Node: aer-core-4.cisco.com Archived-At: Subject: Re: [Lsr] Benjamin Kaduk's Discuss on draft-ietf-isis-mpls-elc-12: (with DISCUSS and COMMENT) X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 26 May 2020 08:58:56 -0000 Hi Ben, please see inline (##PP2) On 21/05/2020 21:38, Benjamin Kaduk wrote: > Hi Peter, > > On Thu, May 21, 2020 at 12:05:39PM +0200, Peter Psenak wrote: >> Benjamin, >> >> thanks for review, please see inline (##PP): >> >> On 20/05/2020 00:44, Benjamin Kaduk via Datatracker wrote: >>> Benjamin Kaduk has entered the following ballot position for >>> draft-ietf-isis-mpls-elc-12: Discuss >>> >>> When responding, please keep the subject line intact and reply to all >>> email addresses included in the To and CC lines. (Feel free to cut this >>> introductory paragraph, however.) >>> >>> >>> Please refer to https://www.ietf.org/iesg/statement/discuss-criteria.html >>> for more information about IESG DISCUSS and COMMENT positions. >>> >>> >>> The document, along with other ballot positions, can be found here: >>> https://datatracker.ietf.org/doc/draft-ietf-isis-mpls-elc/ >>> >>> >>> >>> ---------------------------------------------------------------------- >>> DISCUSS: >>> ---------------------------------------------------------------------- >>> >>> As for other reviewers, many of my comments duplicate those for the OSPF >>> document; I expect that the analogous responses apply and am fine if >>> they only appear for one document's review. >>> >>> Here, the question I have about normative language applies to the text >>> in Section 3: >>> >>> When a router propagates a prefix between ISIS levels ([RFC5302], it >>> MUST preserve the ELC signaling for this prefix. >>> >>> The scenario in question is analogous to the OSPF cross-area case: is >>> the router propagating the prefix between ISIS levels required to >>> implement this document; is preservation of the flag value a new >>> requirement from this document vs. a preexisting property; and is this >>> document trying to make normative requirements of devices that don't >>> implement this document? >> >> ##PP >> this is a new requirement and only applies to the routers that support >> this document. We are not making normative requirements of devices that >> don't implement this document, we cannot. >> >> Maybe we can add that it only applies to the routers that supports this >> extension: >> >> "When a router supporting this extension propagates a prefix between >> ISIS levels ([RFC5302], it MUST preserve the ELC signaling for this prefix." >> >> Would it work? > > That would work, yes. ##PP2 I have suggested some text to clarify ABR and ASBR behavior in my response to Alvaro. Please have a look if that is fine with you. I'm not going to add the "When a router supporting this extension", as this was not necessary according to Alvaro. > I think what bothers me about the current text is that it feels like a > global statement that holds universally everywhere (and as such would be > "scope overreach"). Even to say something like "ELC signaling MUST be > preserved when a router propagates a prefix between ISIS levels" (which is > superficially similar) does not bother me very much, since it presumes a > knowledge of what ELC signaling is (and thus, implementation of this > document) in a way that "unknown prefix attribute flag 3" does not. That > is, we clearly (given your above explanation) don't expect the "unknown > prefix attribute flag 3" to get propagaged, and only when we know that it's > the ELC signalling does the requirement kick in, if that makes sense. > > With respect to Alvaro's clarification, your answer for (1) makes sense; > thanks! I think Alvaro has offered to help work out what (if any) > additional text we might want to be sure that the answer to (2) is clear in > the document. > >> >>> >>> Likewise, the ASBR case for cross-protocol redistribution seems to >>> rather inherently require understanding the semantics of the flags being >>> translated. >> >> similarly to the above I can chnage to: >> >> "When a router supporting this extension redistribute a prefix ..." >> >> >>> >>> >>> ---------------------------------------------------------------------- >>> COMMENT: >>> ---------------------------------------------------------------------- >>> >>> Section 1 >>> >>> Should we add a sentence at the end of the last paragraph about how >>> "this document defines a mechanism to signal the ERLD using IS-IS"? >> >> not sure I understand, how is described in the body of the document. > > I think I maybe put a little more detail on the motivation for this > question in the OSPF document's comments. Basically, it's about parity > between Abstract and Introduction -- the Introduction says clearly "this > draft defines a mechanism to signal the ELC using IS-IS", but there is not > an analogous statement about the ERLD signaling mechanism. As such, it's > an editorial matter of style and you should feel free to ignore the comment > or do what you see fit. ##PP2 I added the below sentence: "This document defines a mechanism to signal the ERLD using IS-IS" Similar has been done to OSPF draft. > >>> >>> In cases where LSPs are used (e.g., SR-MPLS [RFC8660], it would be >>> >>> side note(?): I don't know that SR-MPLS is so popular so as to be >>> privileged as the only example given for LSP usage. If we instead >>> talked about using IGPs to signal labels, this selection would seem less >>> surprising to me. >> >> this document describes the ELC/ERLD capability signaling for SR MPLS. >> For non SR MPLS cases, thee are existing mechanisms to learn ELC/ERLD. >> >> I can replace the text with: >> >> "In cases where SR is used with the MPLS Data Plane" >> >> Would it work? > > Sure, thanks. ##PP2 done. > >> >>> >>> Section 3 >>> >>> unless all of its interfaces are capable of processing ELs. If a >>> router supports ELs on all of its interfaces, it SHOULD set the ELC >>> for every local host prefix it advertises in IS-IS. >>> >>> Do we want to say anything about (not) advertising the ELC for other >>> prefixes? >> >> Do we have to? I can add "MUST NOT set ELC with for any other prefix", >> but I find it unneeded. > > This is the "comment" section of the document, so no, you don't have to :) > I mostly ask because we give guidance on what to do for local host prefixes > but say nothing about the other case. That could be taken to imply that we > don't know what guidance to give, even though someone skilled in the area > who thinks through what the mechanism is doing will come to the conclusion > that it makes no sense/is actively harmful to advertise the ELC for other > prefixes. ##PP2 I would tend to leave it as it is. > >>> >>> Section 4 >>> >>> I agree with Roman's comment about code 2 vs TBD2. >> >> that has been fixed already. >> >>> >>> ERLD in the range between 0 to 255. The scope of the advertisement >>> depends on the application. If a router has multiple interfaces with >>> >>> Just to check: w.r.t. "scope", both this document and the OSPF one only >>> define usage of this MSD type at the scope of a single node, right? (I >>> don't see a particular reason to preclude using it at a different >>> scope.) >> >> the scope here means where the information will be flooded - area only >> or network wide. No such thing as a node scope. > > Oops, sorry for misremembering that part, and thanks for the clarification. > >> >>> >>> Section 6 >>> >>> - Bit 3 in the Bit Values for Prefix Attribute Flags Sub-TLV >>> registry has been assigned to the ELC Flag. IANA is asked to >>> >>> Is there an "IS-IS" in the name of this registry? >> >> no the registry name is "Bit Values for Prefix Attribute Flags Sub-TLV". > > Okay, thanks for confirming. > >> >>> >>> Section 7 >>> >>> Should we say anything about considerations for redistributing ELC/ERLD >>> information at the ASBR with respect to exposing "internal information" >>> to external parties? >> >> why would this be "internal information" and why redistribution would be >> "external party"? Redistribution between IGPs is predominantly done >> between IGPs under same administrative domain. > > I don't have any scenario in mind; I just wanted to check if there were any > significant considerations to mention. It sounds like there aren't such > considerations, and thus nothing to mention. >> >>> >>> This document specifies the ability to advertise additional node >>> capabilities using IS-IS and BGP-LS. As such, the security >>> considerations as described in [RFC7981], [RFC7752], [RFC7794], >>> [RFC8491], [RFC8662], [I-D.ietf-idr-bgp-ls-segment-routing-ext] and >>> >>> RFC 8662's security considerations have a pretty hard dependency on RFC >>> 6790's security considerations; it might be worth mentioning 6790 >>> directly in this list as well. >> >> would not that be implicit when mentioning RFC 8662? > > Yes; this is mostly a question of style. > >> >>> >>> [I-D.ietf-idr-bgp-ls-segment-routing-msd] are applicable to this >>> document. >>> >>> Could we also have a brief note that the normal IS-IS authentication >>> mechanisms serve to protect the ELC/ERLD information? >> >> do we need to repeat this every time we add a bit in the TLV? > > It's my preference, though not a strict need. > >>> >>> Incorrectly setting the E flag during origination, propagation or >>> redistribution may lead to black-holing of the traffic on the egress >>> node. >>> >>> This is what happens when the E flag should not be set but is >>> erroneously set. Should we also say what happens if we should set the E >>> flag but erroneously clear it (e.g., that poor or no load-balancing may >>> occur)? >> >> yes, there is a text there already: >> >> "Incorrectly setting of the ERLD value may lead to poor or no >> load-balancing of the traffic." > > I thought that was about the ERLD value, not the ELC indicator, but trust > you to know best. ##PP2 sorry, you are right. Regarding the "E flag being erroneously clear" - I would think that "Incorrectly setting the E flag " covers both cases of E bit being set when it should not be set and E bit not being set when it should be set. What about this: "Incorrectly setting the E flag during origination, propagation or redistribution may lead to poor or no load-balancing of the traffic or black-holing of the traffic on the egress node." thanks, Peter > >>> >>> Section 8 >>> >>> I do see the note in the shepherd writeup about the sixth author (thank >>> you!); if we're already breaking through the 5-author limit, did we >>> consider making those who "should be considered as co-authors" listed as >>> co-authors? >> >> I'm not fun of this 5 authors rule to be honest. >> >>> >>> Section 10.1 >>> >>> Should we reference RFC 7981 from Section 4 as well? Right now we seem >>> to only use it for the security considerations, which is not necessarily >>> enough to qualify it as a normative reference. >> >> we reference RFC8491, which references RFC 7981. I don't see a need to >> reference RFC 7981 directly. > > Okay. > > Thanks for the clarifications and updates! > > -Ben > > From nobody Tue May 26 04:50:13 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 71C713A0EFE; Tue, 26 May 2020 04:49:20 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -9.598 X-Spam-Level: X-Spam-Status: No, score=-9.598 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001, USER_IN_DEF_DKIM_WL=-7.5] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=cisco.com header.b=lLm8yC5D; dkim=pass (1024-bit key) header.d=cisco.onmicrosoft.com header.b=zUMwlP2s Received: from mail.ietf.org 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15.20.3021.027; Tue, 26 May 2020 11:49:13 +0000 From: "Acee Lindem (acee)" To: Alvaro Retana , Benjamin Kaduk , "Peter Psenak (ppsenak)" CC: "draft-ietf-isis-mpls-elc@ietf.org" , The IESG , "lsr-chairs@ietf.org" , "lsr@ietf.org" Thread-Topic: Benjamin Kaduk's Discuss on draft-ietf-isis-mpls-elc-12: (with DISCUSS and COMMENT) Thread-Index: AQHWLi8YMiDtiOiXz0umkwYeF81nrKiyUmOAgACgLQCAAURHAIAF0RUA Date: Tue, 26 May 2020 11:49:13 +0000 Message-ID: <1852869A-2678-4AA7-AEB9-F7A3014A7191@cisco.com> References: <158992828112.6026.1646593855480055081@ietfa.amsl.com> <1242ad52-bb48-8526-b65b-d413e0cd9e25@cisco.com> <20200521193856.GJ58497@kduck.mit.edu> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: user-agent: Microsoft-MacOutlook/16.37.20051002 authentication-results: gmail.com; dkim=none (message not signed) header.d=none;gmail.com; dmarc=none action=none header.from=cisco.com; x-originating-ip: [136.56.133.70] x-ms-publictraffictype: Email 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a3MsDQpBY2VlDQoNCg0KDQoNCiAgICA+ID4gKDIpIElmIHRoZSBwcm9wYWdhdGlvbiBpcyBub3Qg YXV0b21hdGljLCBhbmQgdGhlIEwxTDIgcm91dGVyIGRvZXNuJ3QNCiAgICA+ID4gc3VwcG9ydCB0 aGlzIHNwZWNpZmljYXRpb24sIHRoZW4gd2hhdCBhcmUgdGhlIGRyYXdiYWNrcy9mYWlsdXJlDQog ICAgPiA+IHNjZW5hcmlvcz8gSU9XLCBmb3IgbXVsdGktbGV2ZWwgb3BlcmF0aW9uIGlzIGl0IGEg cmVxdWlyZW1lbnQgdGhhdA0KICAgID4gPiB0aGUgTDFMMiBzdXBwb3J0IHRoaXMgc3BlY2lmaWNh dGlvbj8NCiAgICA+DQogICAgPiBkcmF3YmFjayBhcmUgaWRlbnRpY2FsIHRvIHdoYXQgaXMgbWVu dGlvbmVkIGluIHRoZSBTZWN1cml0eQ0KICAgID4gQ29uc2lkZXJhdGlvbnMgc2VjdGlvbi4NCg0K ICAgIEkgdGhpbmsgdGhhdCB0ZXh0IGlzIG9rLg0KDQoNCiAgICBUaGFua3MhDQoNCiAgICBBbHZh cm8uDQoNCg== From nobody Tue May 26 05:22:52 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id A29903A0ED0; Tue, 26 May 2020 05:22:31 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -9.601 X-Spam-Level: X-Spam-Status: No, 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mime-version:in-reply-to:content-transfer-encoding; bh=R7rU3qFUQtQl9cUStEXMouxVM4DIXH0uc2INILKTLUE=; b=Pt1Vl6A3rg9/9o/EeWJAFuBrFrZNW/hEvAyF4quxB8VsmegCmOjVFwh6 Q6z+liXY3+xfOrJmOsQHOBjOPQAs5g5RgUoDfbmM/gFR9JXdNhJrZI8ll jV59KPkg4HlQ5lZ+GQsHpEHOKnLhn07bCZBKCmZQYncvFOLe5rVG/ZO03 4=; X-IronPort-AV: E=Sophos;i="5.73,437,1583193600"; d="scan'208";a="26461534" Received: from aer-iport-nat.cisco.com (HELO aer-core-4.cisco.com) ([173.38.203.22]) by aer-iport-4.cisco.com with ESMTP/TLS/DHE-RSA-SEED-SHA; 26 May 2020 12:22:26 +0000 Received: from [10.60.140.51] (ams-ppsenak-nitro2.cisco.com [10.60.140.51]) by aer-core-4.cisco.com (8.15.2/8.15.2) with ESMTP id 04QCMQtZ014335; Tue, 26 May 2020 12:22:26 GMT To: "Acee Lindem (acee)" , Alvaro Retana , Benjamin Kaduk Cc: "draft-ietf-isis-mpls-elc@ietf.org" , The IESG , "lsr-chairs@ietf.org" , "lsr@ietf.org" References: <158992828112.6026.1646593855480055081@ietfa.amsl.com> <1242ad52-bb48-8526-b65b-d413e0cd9e25@cisco.com> <20200521193856.GJ58497@kduck.mit.edu> <1852869A-2678-4AA7-AEB9-F7A3014A7191@cisco.com> From: Peter Psenak Message-ID: Date: Tue, 26 May 2020 14:22:26 +0200 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:60.0) Gecko/20100101 Thunderbird/60.7.0 MIME-Version: 1.0 In-Reply-To: <1852869A-2678-4AA7-AEB9-F7A3014A7191@cisco.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-Outbound-SMTP-Client: 10.60.140.51, ams-ppsenak-nitro2.cisco.com X-Outbound-Node: aer-core-4.cisco.com Archived-At: Subject: Re: [Lsr] Benjamin Kaduk's Discuss on draft-ietf-isis-mpls-elc-12: (with DISCUSS and COMMENT) X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 26 May 2020 12:22:32 -0000 Hi Acee, have you looked at the texts that I suggested in my response to Alvaro earlier today? Please see inline: On 26/05/2020 13:49, Acee Lindem (acee) wrote: > Hi Alvaro, > > See inline. > > On 5/22/20, 10:59 AM, "Alvaro Retana" wrote: > > On May 21, 2020 at 3:39:03 PM, Benjamin Kaduk wrote: > > > Peter: > > Hi! > > > > With respect to Alvaro's clarification, your answer for (1) makes sense; > > thanks! I think Alvaro has offered to help work out what (if any) > > additional text we might want to be sure that the answer to (2) is clear in > > the document. > > I think that #1 is where some clarification could be useful. :-) > > > I'm including both ISIS and OSPF suggestions below to consolidate the > discussion. > > > ... > > > My interpretation of Ben's question is two-fold: > > > > > > (1) Would ISIS routers normally propagate the information to a > > > different level? The ELC is a new prefix attribute flag -- are prefix > > > attributes always propagated (unchanged) to other levels? If so, then > > > the requirement (MUST) is not needed. My reading of rfc7794 is that > > > the propagation is optional... > > > > depends on the attribute or a bit. Some are propagated some are not. > > That's why we are saying this one MUST be preserved. > > Right. > > For ISIS I think the current text is in line with the specification of > the other bits in rfc7794. No changes are needed. > > If anything, you may want to change the order of this sentence to > address Ben's comment: > > OLD> > When a router propagates a prefix between ISIS levels ([RFC5302], it > MUST preserve the ELC signaling for this prefix. > > NEW> > The ELC signaling MUST be preserved when a router propagates a prefix > between ISIS levels ([RFC5302]). > > [Similar for OSPF.] > > > > I think that for OSPF it is not that simple... > > For OSPFv2: rfc7684 says that the "scope of the OSPFv2 Extended Prefix > Opaque LSA depends on the scope of the advertised prefixes", which I > assume means that for intra-area prefixes the scope will be > area-local...so the ABR wouldn't simply propagate it; it would have to > originate a new LSA. > > I agree with the changes but have suggested alternate text. > > Suggestion (Add to 3.1)> > When an OSPFv2 Area Border Router (ABR) distributes information between > connected areas it SHOULD originate an OSPFv2 Extended Prefix Opaque LSA > [RFC7684] including the received ELC setting. If the received information > is included in an LSA with an AS-wide scope, then the new LSA is not needed. when would ABR do inter area propagation of what is advertised in AS scope LSA? I can not think of such a case. thanks, Peter > > I'd suggest: > > When an OSPFv2 Area Border Router (ABR) advertises prefix information between > areas and ELC information is was advertised for the prefix in the source area, the > ABR SHOULD originate an OSPFv2 Extended Prefix Opaque LSA [RFC7684] propagating > the prefix's source area setting. If the ELC setting, is also advertised in an OSPFv2 > Extended Prefix Opaque LSA with AS-wide scope, the additional LSA origination > Is not needed. > > > For OSPFv3: The PrefixOptions are *in* the LSA, but I couldn't find > anything in rfc5340 saying that the received values should be copied > into the Inter-Area-Prefix-LSA (nor that they should not). > > Suggestion (Add to 3.2)> > When an OSPFv3 Area Border Router (ABR) distributes information between > connected areas, the setting of the ELC Flag in the Inter-Area-Prefix-LSA > MUST be the same as the received value. > > I'd suggest: > > When an OSPFv3 Area Border Router (ABR) advertises information between > areas, the setting of the ELC flag in the Inter-area-prefix-LSA MUST be the > propagated unchanged. > > Thanks, > Acee > > > > > > > (2) If the propagation is not automatic, and the L1L2 router doesn't > > > support this specification, then what are the drawbacks/failure > > > scenarios? IOW, for multi-level operation is it a requirement that > > > the L1L2 support this specification? > > > > drawback are identical to what is mentioned in the Security > > Considerations section. > > I think that text is ok. > > > Thanks! > > Alvaro. > > > From nobody Tue May 26 06:20:18 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 222EF3A0F34 for ; Tue, 26 May 2020 06:19:57 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.999 X-Spam-Level: X-Spam-Status: No, score=-1.999 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, HTML_MESSAGE=0.001, HTTPS_HTTP_MISMATCH=0.1, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=verizon.com header.b=NcmcqrKo; 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Tue, 26 May 2020 06:19:51 -0700 (PDT) X-Google-Smtp-Source: ABdhPJypvb8p2jyXyVSHnK6TE6yEdwJbT+dIbrMxEiiKawMi0XKbpJlM4ogDGDL56byFBKwfBfc0R8MuZwEDfmEGabI= X-Received: by 2002:a37:544:: with SMTP id 65mr1223086qkf.115.1590499191166; Tue, 26 May 2020 06:19:51 -0700 (PDT) MIME-Version: 1.0 From: "Toy, Mehmet" Date: Tue, 26 May 2020 09:19:39 -0400 Message-ID: To: lsr-request@ietf.org Cc: lsr@ietf.org Content-Type: multipart/alternative; boundary="0000000000004e2e9805a68cf3e6" X-mailroute: internal X-Proofpoint-Spam-Details: rule=out_spam_notspam policy=out_spam score=0 lowpriorityscore=0 adultscore=0 phishscore=0 clxscore=1011 mlxlogscore=983 bulkscore=0 priorityscore=1501 malwarescore=0 impostorscore=0 mlxscore=0 spamscore=0 suspectscore=0 cotscore=-2147483648 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2004280000 definitions=main-2005260100 Archived-At: Subject: Re: [Lsr] Flooding Topology Computation Algorithm - draft-cc-lsr-flooding-reduction-08 Working Group Adoption Call X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 26 May 2020 13:19:57 -0000 --0000000000004e2e9805a68cf3e6 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable I support the adoption. Thanks Mehmet *From:* Lsr *On Behalf Of *Acee Lindem (acee) *Sent:* Friday, May 15, 2020 3:40 PM *To:* lsr@ietf.org *Subject:* This begins a 3 week (due to holidays) WG adoption call for the =E2=80=9CFl= ooding Topology Computation Algorithm=E2=80=9D draft. Please issue your support or objection to this list by 11:59 PM, UTC on June 5th, 2020. Here is a URL for your convenience. https://datatracker.ietf.org/doc/draft-cc-lsr-flooding-reduction/ Thanks, Acee ... --0000000000004e2e9805a68cf3e6 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
I support=C2=A0the adoption.
Thanks
Mehmet



From:=C2=A0Lsr <lsr-bounces@ietf.org>=C2=A0On Behalf Of=C2=A0Acee Li= ndem (acee)
Sent:=C2=A0Friday, May 15, 2020 3:40 PM
To:= =C2=A0lsr@ietf.orgSubject:=C2=A0

= =C2=A0

This b= egins a 3 week (due to holidays) WG adoption call for the =E2=80=9CFlooding= Topology Computation Algorithm=E2=80=9D draft. Please issue your support o= r objection to this list by 11:59 PM, UTC on June 5th, 2020. Her= e is a URL for your convenience.

=C2=A0

https://dat= atracker.ietf.org/doc/draft-cc-lsr-flooding-reduction/

=C2=A0

Thanks,
Acee

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15.20.3021.027; Tue, 26 May 2020 13:58:29 +0000 From: "Acee Lindem (acee)" To: "Peter Psenak (ppsenak)" , Alvaro Retana , Benjamin Kaduk CC: "draft-ietf-isis-mpls-elc@ietf.org" , The IESG , "lsr-chairs@ietf.org" , "lsr@ietf.org" Thread-Topic: Benjamin Kaduk's Discuss on draft-ietf-isis-mpls-elc-12: (with DISCUSS and COMMENT) Thread-Index: AQHWLi8YMiDtiOiXz0umkwYeF81nrKiyUmOAgACgLQCAAURHAIAF0RUAgABMVwD//9fHAA== Date: Tue, 26 May 2020 13:58:28 +0000 Message-ID: <293409B4-19E6-486B-BCE5-B9B0C58F37BF@cisco.com> References: <158992828112.6026.1646593855480055081@ietfa.amsl.com> <1242ad52-bb48-8526-b65b-d413e0cd9e25@cisco.com> <20200521193856.GJ58497@kduck.mit.edu> <1852869A-2678-4AA7-AEB9-F7A3014A7191@cisco.com> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: user-agent: Microsoft-MacOutlook/16.37.20051002 authentication-results: cisco.com; dkim=none (message not signed) header.d=none;cisco.com; dmarc=none action=none header.from=cisco.com; 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bh=QqcKSie/m2b5Ufjkrhp0kTBfi/SY+Twz14udJxrM8+M=; b=gRHvL9pl3sLU06EfBykM/3+lY0t+2KGWjPsg3F6ID+SAykaZfv7DBFu9 3D7LeK6VLzdgpwNV/AGwLhlLSETK2L3U1vJRHe8TUbPm7r1Iic1ZUWBtN G0sPXtQ66lk2zuc4hcJKpTCXZLE9gUeOCIjvX5w9on4zl6mHgdkdtj/Pi 8=; X-IronPort-AV: E=Sophos;i="5.73,437,1583193600"; d="scan'208";a="26526833" Received: from aer-iport-nat.cisco.com (HELO aer-core-3.cisco.com) ([173.38.203.22]) by aer-iport-2.cisco.com with ESMTP/TLS/DHE-RSA-SEED-SHA; 26 May 2020 14:25:37 +0000 Received: from [10.60.140.51] (ams-ppsenak-nitro2.cisco.com [10.60.140.51]) by aer-core-3.cisco.com (8.15.2/8.15.2) with ESMTP id 04QEPbwN011783; Tue, 26 May 2020 14:25:37 GMT To: "Acee Lindem (acee)" , Alvaro Retana , Benjamin Kaduk Cc: "draft-ietf-isis-mpls-elc@ietf.org" , The IESG , "lsr-chairs@ietf.org" , "lsr@ietf.org" References: <158992828112.6026.1646593855480055081@ietfa.amsl.com> <1242ad52-bb48-8526-b65b-d413e0cd9e25@cisco.com> <20200521193856.GJ58497@kduck.mit.edu> <63cbb2b2-e7ec-3077-ab4d-258ce95e6ef7@cisco.com> From: Peter Psenak Message-ID: <88a5c560-cb61-78c2-3733-931ffe529b6b@cisco.com> Date: Tue, 26 May 2020 16:25:37 +0200 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:60.0) Gecko/20100101 Thunderbird/60.7.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-Outbound-SMTP-Client: 10.60.140.51, ams-ppsenak-nitro2.cisco.com X-Outbound-Node: aer-core-3.cisco.com Archived-At: Subject: Re: [Lsr] Benjamin Kaduk's Discuss on draft-ietf-isis-mpls-elc-12: (with DISCUSS and COMMENT) X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 26 May 2020 14:26:38 -0000 Hi Acee, updated the text based on your comments. thanks, Peter On 26/05/2020 16:07, Acee Lindem (acee) wrote: > Hi Peter, > > This is in response to the previous Email on your suggested text. > > On 5/26/20, 4:26 AM, "Peter Psenak" wrote: > > Hi Alvaro, > > please see inline (##PP) > > On 22/05/2020 16:59, Alvaro Retana wrote: > > On May 21, 2020 at 3:39:03 PM, Benjamin Kaduk wrote: > > > > > > Peter: > > > > Hi! > > > > > >> With respect to Alvaro's clarification, your answer for (1) makes sense; > >> thanks! I think Alvaro has offered to help work out what (if any) > >> additional text we might want to be sure that the answer to (2) is clear in > >> the document. > > > > I think that #1 is where some clarification could be useful. :-) > > > > > > I'm including both ISIS and OSPF suggestions below to consolidate the > > discussion. > > > > > > ... > >>> My interpretation of Ben's question is two-fold: > >>> > >>> (1) Would ISIS routers normally propagate the information to a > >>> different level? The ELC is a new prefix attribute flag -- are prefix > >>> attributes always propagated (unchanged) to other levels? If so, then > >>> the requirement (MUST) is not needed. My reading of rfc7794 is that > >>> the propagation is optional... > >> > >> depends on the attribute or a bit. Some are propagated some are not. > >> That's why we are saying this one MUST be preserved. > > > > Right. > > > > For ISIS I think the current text is in line with the specification of > > the other bits in rfc7794. No changes are needed. > > > > If anything, you may want to change the order of this sentence to > > address Ben's comment: > > > > OLD> > > When a router propagates a prefix between ISIS levels ([RFC5302], it > > MUST preserve the ELC signaling for this prefix. > > > > NEW> > > The ELC signaling MUST be preserved when a router propagates a prefix > > between ISIS levels ([RFC5302]). > > > > [Similar for OSPF.] > > ##PP > done. > > > > > > > > > > I think that for OSPF it is not that simple... > > > > For OSPFv2: rfc7684 says that the "scope of the OSPFv2 Extended Prefix > > Opaque LSA depends on the scope of the advertised prefixes", which I > > assume means that for intra-area prefixes the scope will be > > area-local...so the ABR wouldn't simply propagate it; it would have to > > originate a new LSA. > > ##PP > correct. It is always a new LSA that ABR needs to generate. Here it's > actually two LSAs. > > > > > Suggestion (Add to 3.1)> > > When an OSPFv2 Area Border Router (ABR) distributes information between > > connected areas it SHOULD originate an OSPFv2 Extended Prefix Opaque LSA > > [RFC7684] including the received ELC setting. If the received information > > is included in an LSA with an AS-wide scope, then the new LSA is not needed. > > Here's my suggestion for OSPFv2 ABR related text: > > "The ELC signaling MUST be preserved when an OSPF Area Border Router > (ABR) distributes information between connected areas. To do so, ABR > MUST originate an OSPFv2 Extended Prefix Opaque LSA [RFC7684] including > the received ELC setting." > > Ok - I change "connected areas" to "areas" and "ABR MUST" to "an ABR MUST". > > Here's my suggested text for OSPFv2 ASBR case: > > "When an OSPF Autonomous System Boundary Router (ASBR) redistributes a > prefix from another instance of OSPF or from some other protocol, it > SHOULD preserve the ELC signaling for the prefix if it exists. To do so, > ASBR SHOULD originate Extended Prefix Opaque LSA [RFC7684] including the > ELC setting of the redistributed prefix. The flooding scope of the > Extended Prefix Opaque LSA MUST match the flooding scope of the LSA that > ASBR originates as a result of the redistribution. The exact mechanism > used to exchange ELC between protocol instances on the ASBR is outside > of the scope of this document." > > Sure - replace "ASBR SHOULD" with "an ASBR SHOULD", "that ASBR" with "that an ASBR", and "the ASBR is" with "an ASBR is" to be consistent. > Also, "originate Extended" with "originate an Extended". > > > > > > > > > For OSPFv3: The PrefixOptions are *in* the LSA, but I couldn't find > > anything in rfc5340 saying that the received values should be copied > > into the Inter-Area-Prefix-LSA (nor that they should not). > > > > Suggestion (Add to 3.2)> > > When an OSPFv3 Area Border Router (ABR) distributes information between > > connected areas, the setting of the ELC Flag in the Inter-Area-Prefix-LSA > > MUST be the same as the received value. > > Here's my suggestion for OSPFv3 ABR and ASBR: > > "The ELC signaling MUST be preserved when an OSPFv3 Area Border Router > (ABR) distributes information between connected areas. The setting of > the ELC Flag in the Inter-Area-Prefix-LSA [RFC5340] or in the > Inter-Area-Prefix TLV [RFC8362], generated by ABR, MUST be the same as > the value the ELC Flag associated with the prefix in the source area." > > Same change - replace "connected areas" with "areas" and "by ABR" with "by an ABR". > > "When an OSPFv3 Autonomous System Boundary Router (ASBR) redistributes a > prefix from another instance of OSPFv3 or from some other protocol, it > SHOULD preserve the ELC signaling for the prefix if it exists. The > setting of the ELC Flag in the AS-External-LSA [RFC5340] or in the > External-Prefix TLV [RFC8362], generated by ASBR, MUST be the same as > the value the ELC Flag associated with the prefix in the source domain. > The exact mechanism used to exchange ELC between protocol instances on > the ASBR is outside of the scope of this document. > > Add "NSSA-LSA" as a case. Replace "by ASBR" with "by an ASBR" and "value the ELC" with "value of the ELC". > > Thanks, > Acee > > thanks, > Peter > > > > > > > > > > > >>> (2) If the propagation is not automatic, and the L1L2 router doesn't > >>> support this specification, then what are the drawbacks/failure > >>> scenarios? IOW, for multi-level operation is it a requirement that > >>> the L1L2 support this specification? > >> > >> drawback are identical to what is mentioned in the Security > >> Considerations section. > > > > I think that text is ok. > > > > > > Thanks! > > > > Alvaro. > > > > > > > > From nobody Tue May 26 07:34:10 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 3398C3A10E0; Tue, 26 May 2020 07:28:44 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -9.598 X-Spam-Level: X-Spam-Status: No, score=-9.598 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001, USER_IN_DEF_DKIM_WL=-7.5] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); 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15.20.3021.027; Tue, 26 May 2020 14:28:19 +0000 From: "Acee Lindem (acee)" To: "Peter Psenak (ppsenak)" , Alvaro Retana , Benjamin Kaduk CC: "draft-ietf-isis-mpls-elc@ietf.org" , The IESG , "lsr-chairs@ietf.org" , "lsr@ietf.org" Thread-Topic: Benjamin Kaduk's Discuss on draft-ietf-isis-mpls-elc-12: (with DISCUSS and COMMENT) Thread-Index: AQHWLi8YMiDtiOiXz0umkwYeF81nrKiyUmOAgACgLQCAAURHAIAF23oAgAAcTICAAEgRgP//vbEA Date: Tue, 26 May 2020 14:28:19 +0000 Message-ID: <0A45769F-40ED-45A8-8853-FFB346E09F03@cisco.com> References: <158992828112.6026.1646593855480055081@ietfa.amsl.com> <1242ad52-bb48-8526-b65b-d413e0cd9e25@cisco.com> <20200521193856.GJ58497@kduck.mit.edu> <63cbb2b2-e7ec-3077-ab4d-258ce95e6ef7@cisco.com> <88a5c560-cb61-78c2-3733-931ffe529b6b@cisco.com> In-Reply-To: <88a5c560-cb61-78c2-3733-931ffe529b6b@cisco.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: user-agent: Microsoft-MacOutlook/16.37.20051002 authentication-results: cisco.com; 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<0A7E501C8DAB264882330FC83EFA1EC6@namprd11.prod.outlook.com> Content-Transfer-Encoding: base64 MIME-Version: 1.0 X-MS-Exchange-CrossTenant-Network-Message-Id: f90d0ebb-edbb-4b46-8aed-08d8018109b7 X-MS-Exchange-CrossTenant-originalarrivaltime: 26 May 2020 14:28:19.6199 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 5ae1af62-9505-4097-a69a-c1553ef7840e X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: NJcQeDdcE1wnwpy/X/ikJ93m1fI+2xeWv9Sh5YOgYA64iLeZFQV5B+aoX25POUlX X-MS-Exchange-Transport-CrossTenantHeadersStamped: BYAPR11MB3112 X-OriginatorOrg: cisco.com X-Outbound-SMTP-Client: 173.36.7.14, xch-aln-004.cisco.com X-Outbound-Node: rcdn-core-9.cisco.com Archived-At: Subject: Re: [Lsr] Benjamin Kaduk's Discuss on draft-ietf-isis-mpls-elc-12: (with DISCUSS and COMMENT) X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: 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<88a5c560-cb61-78c2-3733-931ffe529b6b@cisco.com> References: <158992828112.6026.1646593855480055081@ietfa.amsl.com> <1242ad52-bb48-8526-b65b-d413e0cd9e25@cisco.com> <20200521193856.GJ58497@kduck.mit.edu> <63cbb2b2-e7ec-3077-ab4d-258ce95e6ef7@cisco.com> <88a5c560-cb61-78c2-3733-931ffe529b6b@cisco.com> MIME-Version: 1.0 Date: Tue, 26 May 2020 08:03:17 -0700 Message-ID: To: "Acee Lindem (acee)" , Peter Psenak , Benjamin Kaduk Cc: "draft-ietf-isis-mpls-elc@ietf.org" , The IESG , "lsr-chairs@ietf.org" , "lsr@ietf.org" Content-Type: multipart/alternative; boundary="0000000000003f154805a68e657d" Archived-At: Subject: Re: [Lsr] Benjamin Kaduk's Discuss on draft-ietf-isis-mpls-elc-12: (with DISCUSS and COMMENT) X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 26 May 2020 15:03:26 -0000 --0000000000003f154805a68e657d Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Just for the record, I=E2=80=99m ok with the latest text. Thanks! Alvaro. On May 26, 2020 at 10:25:38 AM, Peter Psenak (ppsenak@cisco.com) wrote: Hi Acee, updated the text based on your comments. thanks, Peter On 26/05/2020 16:07, Acee Lindem (acee) wrote: > Hi Peter, > > This is in response to the previous Email on your suggested text. > > On 5/26/20, 4:26 AM, "Peter Psenak" wrote: > > Hi Alvaro, > > please see inline (##PP) > > On 22/05/2020 16:59, Alvaro Retana wrote: > > On May 21, 2020 at 3:39:03 PM, Benjamin Kaduk wrote: > > > > > > Peter: > > > > Hi! > > > > > >> With respect to Alvaro's clarification, your answer for (1) makes sense; > >> thanks! I think Alvaro has offered to help work out what (if any) > >> additional text we might want to be sure that the answer to (2) is clear in > >> the document. > > > > I think that #1 is where some clarification could be useful. :-) > > > > > > I'm including both ISIS and OSPF suggestions below to consolidate the > > discussion. > > > > > > ... > >>> My interpretation of Ben's question is two-fold: > >>> > >>> (1) Would ISIS routers normally propagate the information to a > >>> different level? The ELC is a new prefix attribute flag -- are prefix > >>> attributes always propagated (unchanged) to other levels? If so, then > >>> the requirement (MUST) is not needed. My reading of rfc7794 is that > >>> the propagation is optional... > >> > >> depends on the attribute or a bit. Some are propagated some are not. > >> That's why we are saying this one MUST be preserved. > > > > Right. > > > > For ISIS I think the current text is in line with the specification of > > the other bits in rfc7794. No changes are needed. > > > > If anything, you may want to change the order of this sentence to > > address Ben's comment: > > > > OLD> > > When a router propagates a prefix between ISIS levels ([RFC5302], it > > MUST preserve the ELC signaling for this prefix. > > > > NEW> > > The ELC signaling MUST be preserved when a router propagates a prefix > > between ISIS levels ([RFC5302]). > > > > [Similar for OSPF.] > > ##PP > done. > > > > > > > > > > I think that for OSPF it is not that simple... > > > > For OSPFv2: rfc7684 says that the "scope of the OSPFv2 Extended Prefix > > Opaque LSA depends on the scope of the advertised prefixes", which I > > assume means that for intra-area prefixes the scope will be > > area-local...so the ABR wouldn't simply propagate it; it would have to > > originate a new LSA. > > ##PP > correct. It is always a new LSA that ABR needs to generate. Here it's > actually two LSAs. > > > > > Suggestion (Add to 3.1)> > > When an OSPFv2 Area Border Router (ABR) distributes information between > > connected areas it SHOULD originate an OSPFv2 Extended Prefix Opaque LSA > > [RFC7684] including the received ELC setting. If the received information > > is included in an LSA with an AS-wide scope, then the new LSA is not needed. > > Here's my suggestion for OSPFv2 ABR related text: > > "The ELC signaling MUST be preserved when an OSPF Area Border Router > (ABR) distributes information between connected areas. To do so, ABR > MUST originate an OSPFv2 Extended Prefix Opaque LSA [RFC7684] including > the received ELC setting." > > Ok - I change "connected areas" to "areas" and "ABR MUST" to "an ABR MUST". > > Here's my suggested text for OSPFv2 ASBR case: > > "When an OSPF Autonomous System Boundary Router (ASBR) redistributes a > prefix from another instance of OSPF or from some other protocol, it > SHOULD preserve the ELC signaling for the prefix if it exists. To do so, > ASBR SHOULD originate Extended Prefix Opaque LSA [RFC7684] including the > ELC setting of the redistributed prefix. The flooding scope of the > Extended Prefix Opaque LSA MUST match the flooding scope of the LSA that > ASBR originates as a result of the redistribution. The exact mechanism > used to exchange ELC between protocol instances on the ASBR is outside > of the scope of this document." > > Sure - replace "ASBR SHOULD" with "an ASBR SHOULD", "that ASBR" with "that an ASBR", and "the ASBR is" with "an ASBR is" to be consistent. > Also, "originate Extended" with "originate an Extended". > > > > > > > > > For OSPFv3: The PrefixOptions are *in* the LSA, but I couldn't find > > anything in rfc5340 saying that the received values should be copied > > into the Inter-Area-Prefix-LSA (nor that they should not). > > > > Suggestion (Add to 3.2)> > > When an OSPFv3 Area Border Router (ABR) distributes information between > > connected areas, the setting of the ELC Flag in the Inter-Area-Prefix-LSA > > MUST be the same as the received value. > > Here's my suggestion for OSPFv3 ABR and ASBR: > > "The ELC signaling MUST be preserved when an OSPFv3 Area Border Router > (ABR) distributes information between connected areas. The setting of > the ELC Flag in the Inter-Area-Prefix-LSA [RFC5340] or in the > Inter-Area-Prefix TLV [RFC8362], generated by ABR, MUST be the same as > the value the ELC Flag associated with the prefix in the source area." > > Same change - replace "connected areas" with "areas" and "by ABR" with "by an ABR". > > "When an OSPFv3 Autonomous System Boundary Router (ASBR) redistributes a > prefix from another instance of OSPFv3 or from some other protocol, it > SHOULD preserve the ELC signaling for the prefix if it exists. The > setting of the ELC Flag in the AS-External-LSA [RFC5340] or in the > External-Prefix TLV [RFC8362], generated by ASBR, MUST be the same as > the value the ELC Flag associated with the prefix in the source domain. > The exact mechanism used to exchange ELC between protocol instances on > the ASBR is outside of the scope of this document. > > Add "NSSA-LSA" as a case. Replace "by ASBR" with "by an ASBR" and "value the ELC" with "value of the ELC". > > Thanks, > Acee > > thanks, > Peter > > > > > > > > > > > >>> (2) If the propagation is not automatic, and the L1L2 router doesn't > >>> support this specification, then what are the drawbacks/failure > >>> scenarios? IOW, for multi-level operation is it a requirement that > >>> the L1L2 support this specification? > >> > >> drawback are identical to what is mentioned in the Security > >> Considerations section. > > > > I think that text is ok. > > > > > > Thanks! > > > > Alvaro. > > > > > > > > --0000000000003f154805a68e657d Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable =
Just for the record, I=E2=80=99m ok with the lat= est text.
Thanks!

Alvaro.

On May 26, 2020 at 10:25:38 AM, Peter Psenak (ppsenak@cisco.com) wrote:

Hi Acee,

updated the text based on your comments.

thanks,
Peter


On 26/05/2020 16:07, Acee Lindem (acee) wrote:
> Hi Peter,
> =20
> This is in response to the previous Email on your suggested text.
> =20
> On 5/26/20, 4:26 AM, "Peter Psenak" <ppsenak@cisco.com> wrote:
> =20
> Hi Alvaro,
> =20
> please see inline (##PP)
> =20
> On 22/05/2020 16:59, Alvaro Retana wrote:
> > On May 21, 2020 at 3:39:03 PM, Benjamin Kaduk wrote:
> >
> >
> > Peter:
> >
> > Hi!
> >
> >
> >> With respect to Alvaro's clarification, your ans= wer for (1) makes sense;
> >> thanks! I think Alvaro has offered to help work out = what (if any)
> >> additional text we might want to be sure that the an= swer to (2) is clear in
> >> the document.
> >
> > I think that #1 is where some clarification could be use= ful. :-)
> >
> >
> > I'm including both ISIS and OSPF suggestions below t= o consolidate the
> > discussion.
> >
> >
> > ...
> >>> My interpretation of Ben's question is two-f= old:
> >>>
> >>> (1) Would ISIS routers normally propagate the in= formation to a
> >>> different level? The ELC is a new prefix attribu= te flag -- are prefix
> >>> attributes always propagated (unchanged) to othe= r levels? If so, then
> >>> the requirement (MUST) is not needed. My reading= of rfc7794 is that
> >>> the propagation is optional...
> >>
> >> depends on the attribute or a bit. Some are propagat= ed some are not.
> >> That's why we are saying this one MUST be preser= ved.
> >
> > Right.
> >
> > For ISIS I think the current text is in line with the sp= ecification of
> > the other bits in rfc7794. No changes are needed.
> >
> > If anything, you may want to change the order of this se= ntence to
> > address Ben's comment:
> >
> > OLD>
> > When a router propagates a prefix between ISIS level= s ([RFC5302], it
> > MUST preserve the ELC signaling for this prefix.
> >
> > NEW>
> > The ELC signaling MUST be preserved when a router pr= opagates a prefix
> > between ISIS levels ([RFC5302]).
> >
> > [Similar for OSPF.]
> =20
> ##PP
> done.
> =20
> =20
> >
> >
> >
> > I think that for OSPF it is not that simple...
> >
> > For OSPFv2: rfc7684 says that the "scope of the OSP= Fv2 Extended Prefix
> > Opaque LSA depends on the scope of the advertised prefix= es", which I
> > assume means that for intra-area prefixes the scope will= be
> > area-local...so the ABR wouldn't simply propagate it= ; it would have to
> > originate a new LSA.
> =20
> ##PP
> correct. It is always a new LSA that ABR needs to generate. H= ere it's
> actually two LSAs.
> =20
> >
> > Suggestion (Add to 3.1)>
> > When an OSPFv2 Area Border Router (ABR) distributes = information between
> > connected areas it SHOULD originate an OSPFv2 Extend= ed Prefix Opaque LSA
> > [RFC7684] including the received ELC setting. If th= e received information
> > is included in an LSA with an AS-wide scope, then th= e new LSA is not needed.
> =20
> Here's my suggestion for OSPFv2 ABR related text:
> =20
> "The ELC signaling MUST be preserved when an OSPF Area B= order Router
> (ABR) distributes information between connected areas. To do = so, ABR
> MUST originate an OSPFv2 Extended Prefix Opaque LSA [RFC7684]= including
> the received ELC setting."
> =20
> Ok - I change "connected areas" to "areas" and= "ABR MUST" to "an ABR MUST".
> =20
> Here's my suggested text for OSPFv2 ASBR case:
> =20
> "When an OSPF Autonomous System Boundary Router (ASBR) r= edistributes a
> prefix from another instance of OSPF or from some other proto= col, it
> SHOULD preserve the ELC signaling for the prefix if it exists= . To do so,
> ASBR SHOULD originate Extended Prefix Opaque LSA [RFC7684] in= cluding the
> ELC setting of the redistributed prefix. The flooding scope o= f the
> Extended Prefix Opaque LSA MUST match the flooding scope of t= he LSA that
> ASBR originates as a result of the redistribution. The exact = mechanism
> used to exchange ELC between protocol instances on the ASBR i= s outside
> of the scope of this document."
> =20
> Sure - replace "ASBR SHOULD" with "an ASBR SHOULD&q= uot;, "that ASBR" with "that an ASBR", and "the AS= BR is" with "an ASBR is" to be consistent.
> Also, "originate Extended" with "originate an Exten= ded".
> =20
> =20
> =20
> >
> >
> > For OSPFv3: The PrefixOptions are *in* the LSA, but I co= uldn't find
> > anything in rfc5340 saying that the received values shou= ld be copied
> > into the Inter-Area-Prefix-LSA (nor that they should not= ).
> >
> > Suggestion (Add to 3.2)>
> > When an OSPFv3 Area Border Router (ABR) distributes = information between
> > connected areas, the setting of the ELC Flag in the = Inter-Area-Prefix-LSA
> > MUST be the same as the received value.
> =20
> Here's my suggestion for OSPFv3 ABR and ASBR:
> =20
> "The ELC signaling MUST be preserved when an OSPFv3 Area= Border Router
> (ABR) distributes information between connected areas. The se= tting of
> the ELC Flag in the Inter-Area-Prefix-LSA [RFC5340] or in the
> Inter-Area-Prefix TLV [RFC8362], generated by ABR, MUST be th= e same as
> the value the ELC Flag associated with the prefix in the sour= ce area."
> =20
> Same change - replace "connected areas" with "areas= " and "by ABR" with "by an ABR".
> =20
> "When an OSPFv3 Autonomous System Boundary Router (ASBR)= redistributes a
> prefix from another instance of OSPFv3 or from some other pro= tocol, it
> SHOULD preserve the ELC signaling for the prefix if it exists= . The
> setting of the ELC Flag in the AS-External-LSA [RFC5340] or i= n the
> External-Prefix TLV [RFC8362], generated by ASBR, MUST be the= same as
> the value the ELC Flag associated with the prefix in the sour= ce domain. =09
> The exact mechanism used to exchange ELC between protocol ins= tances on
> the ASBR is outside of the scope of this document.
> =20
> Add "NSSA-LSA" as a case. Replace "by ASBR" wi= th "by an ASBR" and "value the ELC" with "value of= the ELC".
> =20
> Thanks,
> Acee
> =20
> thanks,
> Peter
> =20
> =20
> >
> >
> >
> >
> >>> (2) If the propagation is not automatic, and the= L1L2 router doesn't
> >>> support this specification, then what are the dr= awbacks/failure
> >>> scenarios? IOW, for multi-level operation is it = a requirement that
> >>> the L1L2 support this specification?
> >>
> >> drawback are identical to what is mentioned in the S= ecurity
> >> Considerations section.
> >
> > I think that text is ok.
> >
> >
> > Thanks!
> >
> > Alvaro.
> >
> >
> =20
> =20
> =20
> =20

<= /body> --0000000000003f154805a68e657d-- From nobody Wed May 27 08:17:11 2020 Return-Path: X-Original-To: lsr@ietf.org Delivered-To: lsr@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id 742043A0E90; Wed, 27 May 2020 08:17:05 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit From: Scott Bradner via Datatracker To: Cc: draft-ietf-ospf-te-link-attr-reuse.all@ietf.org, lsr@ietf.org, last-call@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 7.1.0 Auto-Submitted: auto-generated Precedence: bulk Message-ID: <159059262542.19823.6779966735787003447@ietfa.amsl.com> Reply-To: Scott Bradner Date: Wed, 27 May 2020 08:17:05 -0700 Archived-At: Subject: [Lsr] Opsdir last call review of draft-ietf-ospf-te-link-attr-reuse-12 X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 27 May 2020 15:17:06 -0000 Reviewer: Scott Bradner Review result: Not Ready This is an OPS-DIR review of OSPF Link Traffic Engineering Attribute Reuse (draft-ietf-ospf-te-link-attr-reuse) This ID describes application-specific attribute advertisements for use in OSPF. I found this ID hard to read and recommend that it be reviewed for readability. I have a basic question about this proposal – the ID describes specific advertisements to be used when particular applications want to make use of specific link attributes and says that other applications should not make of the information in the advertisement without saying why such use would be a problem. I can imagine some reasons but it seems to me that it would be good if this document just explained the problem it is trying to solve. Some specific issues in the document Page 6 – the text says “Standard Application Identifier Bit Mask: Optional set of bits, where each bit represents a single standard application. Bits are defined in [I-D.ietf-isis-te-app].” - it seems to me that this should be in an IANA registry for extensibility but it does not seem to be in the referenced ID but I could not actually tell Page 6 – text says “The bits are repeated here for informational purpose” maybe point to a IANA registry or say “current assignments” Page 6 – text says “If the link attribute advertisement is limited to be used by a specific set of applications” - maybe say “intended” rather than “limited” since I do not see a way to actually limit a future application from eavesdropping on the advertisement Page 7 – the text says “If the SABM or UDABM length is other than 0, 4, or 8, the ASLA sub-TLV MUST be ignored by the receiver.” - it would seem to be useful operations-wise to say that an indication of an error should be recorded somewhere Page 7 – a “User Defined Application Identifier” is introduced but never described – what uses it and what is it used for Section 11 – I found this discussion of the relationship between the existence of a particular advertisement and the possible existence of an application to use that advertisement to be quite confusing – if the existence of a particular advertisement does not indicate that any application is listening why not just say that? Section 12.1 – it would help to say what problem is trying to be solved – why is the use of RSVP-TE LSA advertisements a problem? Section 12.3.3 – I could not tell if this section is saying that the application specific attribute advertisements could not be used if there is even a single legacy router present of if the presence of such a router means that the application specific attribute advertisements can be used but the old advertisements must also be used Section 14 – it might help to say how new Sub-TLV types can be added to the registry From nobody Wed May 27 10:35:00 2020 Return-Path: X-Original-To: lsr@ietf.org Delivered-To: lsr@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id 247A53A0A39; Wed, 27 May 2020 10:34:55 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: internet-drafts@ietf.org To: Cc: lsr@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 7.1.0 Auto-Submitted: auto-generated Precedence: bulk Reply-To: lsr@ietf.org Message-ID: <159060089511.18664.8246828851361548975@ietfa.amsl.com> Date: Wed, 27 May 2020 10:34:55 -0700 Archived-At: Subject: [Lsr] I-D Action: draft-ietf-lsr-dynamic-flooding-06.txt X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 27 May 2020 17:34:55 -0000 A New Internet-Draft is available from the on-line Internet-Drafts directories. This draft is a work item of the Link State Routing WG of the IETF. Title : Dynamic Flooding on Dense Graphs Authors : Tony Li Peter Psenak Les Ginsberg Huaimo Chen Tony Przygienda Dave Cooper Luay Jalil Srinath Dontula Filename : draft-ietf-lsr-dynamic-flooding-06.txt Pages : 47 Date : 2020-05-27 Abstract: Routing with link state protocols in dense network topologies can result in sub-optimal convergence times due to the overhead associated with flooding. This can be addressed by decreasing the flooding topology so that it is less dense. This document discusses the problem in some depth and an architectural solution. Specific protocol changes for IS-IS, OSPFv2, and OSPFv3 are described in this document. The IETF datatracker status page for this draft is: https://datatracker.ietf.org/doc/draft-ietf-lsr-dynamic-flooding/ There are also htmlized versions available at: https://tools.ietf.org/html/draft-ietf-lsr-dynamic-flooding-06 https://datatracker.ietf.org/doc/html/draft-ietf-lsr-dynamic-flooding-06 A diff from the previous version is available at: https://www.ietf.org/rfcdiff?url2=draft-ietf-lsr-dynamic-flooding-06 Please note that it may take a couple of minutes from the time of submission until the htmlized version and diff are available at tools.ietf.org. 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Wed, 27 May 2020 17:49:25 +0000 From: "Les Ginsberg (ginsberg)" To: "tony.li@tony.li" , Gyan Mishra CC: "lsr@ietf.org" , Huaimo Chen , "Acee Lindem (acee)" Thread-Topic: [Lsr] Flooding Topology Computation Algorithm - draft-cc-lsr-flooding-reduction-08 Working Group Adoption Call Thread-Index: AQHWKvCWbO+rNwui80Sty0q3wo/aI6iuQDRQgAC6fICAAVrmiIAAx0uAgAAJcYCACyDrEA== Date: Wed, 27 May 2020 17:49:25 +0000 Message-ID: References: <63330FD6-EDE8-4938-AA85-948279C57E34@cisco.com> <98470E08-B758-45F4-930D-60015D2EAA3B@tony.li> In-Reply-To: <98470E08-B758-45F4-930D-60015D2EAA3B@tony.li> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: tony.li; dkim=none (message not signed) header.d=none;tony.li; dmarc=none action=none header.from=cisco.com; x-originating-ip: [2602:306:36ca:6640:15dd:6a31:4ad8:c409] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: ca3236f9-c060-4043-b5da-08d802664bd6 x-ms-traffictypediagnostic: SA0PR11MB4766: x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:9508; 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charset="us-ascii" Content-Transfer-Encoding: quoted-printable Tony/Gyan - Please find my replies inline. From: Lsr On Behalf Of tony.li@tony.li Sent: Wednesday, May 20, 2020 8:48 AM To: Gyan Mishra Cc: lsr@ietf.org; Huaimo Chen ; Acee Lindem (ace= e) Subject: Re: [Lsr] Flooding Topology Computation Algorithm - draft-cc-lsr-f= looding-reduction-08 Working Group Adoption Call Hi Gyan, This is a much needed feature that operators have been needing for densely = meshed topologies that commonly exist in data centers to accommodate very h= igh bandwidth E-W traffic. Thank you. Please look at the feature description and it does seem to be exactly the s= ame as this draft. Please confirm. It would appear to be a different, proprietary, and unpublished algorithm. [Les:] Yes, this is a different algorithm than either https://datatracker.i= etf.org/doc/draft-chen-lsr-dynamic-flooding-algorithm/ or https://datatrac= ker.ietf.org/doc/draft-cc-lsr-flooding-reduction/ We are contemplating submitting a draft for this algorithm to the WG. This will give us three different implementations, using three different al= gorithms, none of which will inter-operate. Whee!!! :-( [Les:] As I understand it, draft-chen only supports centralized mode - whic= h is why it is Informational track and does not have interoperability conce= rns. Sarah/Tony - do you have plans to extend this to support distributed mode a= nd then standardize it? At present there are no standard algorithm candidates which have achieved W= G status - though that likely will change very soon. And the point of allowing multiple standardized algorithms to be defined wa= s in the expectation that more than one might be proven useful. There maybe other vendors due to industry demand have to get the feature de= ployed before it reaches standards vendor consensus with the IETF. Our implementation shipped last year. [Les:] As did Cisco's. We are testing this feature and planning to deploy but wanted to ensure tha= t this is the same as the draft on the standards track. It does not appear to be, but someone from Cisco should confirm. [Les:] Confirmed. Les Tony --_000_SA0PR11MB462438CE12785AD7B2372BAFC1B10SA0PR11MB4624namp_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Tony/Gyan –

 

Please find my replies inline.

 

From: Lsr <lsr-bounces@ietf.org> On = Behalf Of tony.li@tony.li
Sent: Wednesday, May 20, 2020 8:48 AM
To: Gyan Mishra <hayabusagsm@gmail.com>
Cc: lsr@ietf.org; Huaimo Chen <huaimo.chen@futurewei.com>; Ace= e Lindem (acee) <acee=3D40cisco.com@dmarc.ietf.org>
Subject: Re: [Lsr] Flooding Topology Computation Algorithm - draft-c= c-lsr-flooding-reduction-08 Working Group Adoption Call

 

 

Hi Gyan,

 



This is a much needed feature that operators have be= en needing for densely meshed topologies that commonly exist in data center= s to accommodate very high bandwidth E-W traffic.

 

Thank you.



Please look at the feature description and it doe= s seem to be exactly the same as this draft.  Please confirm. 

 

 

It would appear to be a different, proprietary, and = unpublished algorithm.  

 

[Les:] Yes, this = is a different algorithm than either https://datatracker.ietf.org/doc/draft-chen-lsr-dynamic-flooding-algorithm/= or  https://datatracker.ietf.org/doc/draft-cc-lsr-flooding-red= uction/

 =

We are contemplat= ing submitting a draft for this algorithm to the WG.

 =

 

 

This will give us three different implementations, u= sing three different algorithms, none of which will inter-operate.  Wh= ee!!! :-(

 

 

[Les:] As I under= stand it, draft-chen only supports centralized mode – which is why it= is Informational track and does not have interoperability concerns.

Sarah/Tony - do y= ou have plans to extend this to support distributed mode and then standardi= ze it?

 =

At present there = are no standard algorithm candidates which have achieved WG status – = though that likely will change very soon.

And the point of = allowing multiple standardized algorithms to be defined was in the expectat= ion that more than one might be proven useful.=

 



There maybe other vendors due to industry demand = have to get the feature deployed before it reaches standards vendor consens= us with the IETF.

 

 

Our implementation shipped last year.

 

[Les:] As did Cis= co’s.

 

 

We are testing this feature and planning to deplo= y but wanted to ensure that this is the same as the draft on the standards = track.

 

 

It does not appear to be, but someone from Cisco sho= uld confirm.

 

[Les:] Confirmed.=

 =

   Les<= o:p>

 

Tony

 

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Les > -----Original Message----- > From: Lsr On Behalf Of internet-drafts@ietf.org > Sent: Wednesday, May 27, 2020 10:35 AM > To: i-d-announce@ietf.org > Cc: lsr@ietf.org > Subject: [Lsr] I-D Action: draft-ietf-lsr-dynamic-flooding-06.txt >=20 >=20 > A New Internet-Draft is available from the on-line Internet-Drafts direct= ories. > This draft is a work item of the Link State Routing WG of the IETF. >=20 > Title : Dynamic Flooding on Dense Graphs > Authors : Tony Li > Peter Psenak > Les Ginsberg > Huaimo Chen > Tony Przygienda > Dave Cooper > Luay Jalil > Srinath Dontula > Filename : draft-ietf-lsr-dynamic-flooding-06.txt > Pages : 47 > Date : 2020-05-27 >=20 > Abstract: > Routing with link state protocols in dense network topologies can > result in sub-optimal convergence times due to the overhead > associated with flooding. This can be addressed by decreasing the > flooding topology so that it is less dense. >=20 > This document discusses the problem in some depth and an > architectural solution. Specific protocol changes for IS-IS, OSPFv2, > and OSPFv3 are described in this document. >=20 >=20 > The IETF datatracker status page for this draft is: > https://datatracker.ietf.org/doc/draft-ietf-lsr-dynamic-flooding/ >=20 > There are also htmlized versions available at: > https://tools.ietf.org/html/draft-ietf-lsr-dynamic-flooding-06 > https://datatracker.ietf.org/doc/html/draft-ietf-lsr-dynamic-flooding-06 >=20 > A diff from the previous version is available at: > https://www.ietf.org/rfcdiff?url2=3Ddraft-ietf-lsr-dynamic-flooding-06 >=20 >=20 > Please note that it may take a couple of minutes from the time of submiss= ion > until the htmlized version and diff are available at tools.ietf.org. >=20 > Internet-Drafts are also available by anonymous FTP at: > ftp://ftp.ietf.org/internet-drafts/ >=20 >=20 > _______________________________________________ > Lsr mailing list > Lsr@ietf.org > https://www.ietf.org/mailman/listinfo/lsr From nobody Wed May 27 11:40:50 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 461933A0844 for ; 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Wed, 27 May 2020 11:40:45 -0700 (PDT) Received: from [10.95.95.196] ([162.210.129.5]) by smtp.gmail.com with ESMTPSA id l23sm2500634pff.80.2020.05.27.11.40.43 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Wed, 27 May 2020 11:40:44 -0700 (PDT) Sender: Tony Li From: tony.li@tony.li Message-Id: Content-Type: multipart/alternative; boundary="Apple-Mail=_C09BCF24-7921-40D5-A691-1647AF3FD2A0" Mime-Version: 1.0 (Mac OS X Mail 13.4 \(3608.80.23.2.2\)) Date: Wed, 27 May 2020 11:40:42 -0700 In-Reply-To: Cc: Gyan Mishra , "lsr@ietf.org" , Huaimo Chen , "Acee Lindem (acee)" To: Les Ginsberg References: <63330FD6-EDE8-4938-AA85-948279C57E34@cisco.com> <98470E08-B758-45F4-930D-60015D2EAA3B@tony.li> X-Mailer: Apple Mail (2.3608.80.23.2.2) Archived-At: Subject: Re: [Lsr] Flooding Topology Computation Algorithm - draft-cc-lsr-flooding-reduction-08 Working Group Adoption Call X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 27 May 2020 18:40:48 -0000 --Apple-Mail=_C09BCF24-7921-40D5-A691-1647AF3FD2A0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=utf-8 Les, > We are contemplating submitting a draft for this algorithm to the WG. We would welcome that. =20 Does your algorithm have any relationship to = https://tools.ietf.org/html/draft-allan-lsr-flooding-algorithm-00? = > [Les:] As I understand it, draft-chen only supports centralized mode = =E2=80=93 which is why it is Informational track and does not have = interoperability concerns. > Sarah/Tony - do you have plans to extend this to support distributed = mode and then standardize it? Not at this time. As we said during our presentation, we found = debugging this already =E2=80=98challenging=E2=80=99 and morphing it to = be distributed and deterministic in distributed mode doesn=E2=80=99t = pass our sense of a beneficial cost/benefit ratio. We have no objections if others want to take this on. Centralized mode = Just Works. > And the point of allowing multiple standardized algorithms to be = defined was in the expectation that more than one might be proven = useful. Interoperability might also prove useful. :-) Tony --Apple-Mail=_C09BCF24-7921-40D5-A691-1647AF3FD2A0 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=utf-8

Les,


We are = contemplating submitting a draft for this algorithm to the = WG.


We would welcome that. =  

Does your algorithm have any = relationship to https://tools.ietf.org/html/draft-allan-lsr-flooding-algorithm-= 00?


[Les:] As I = understand it, draft-chen only supports centralized mode =E2=80=93 which = is why it is Informational track and does not have interoperability = concerns.
Sarah/Tony - do you have plans to = extend this to support distributed mode and then standardize = it?


Not at this time. =  As we said during our presentation, we found debugging this = already =E2=80=98challenging=E2=80=99 and morphing it to be distributed = and deterministic in distributed mode doesn=E2=80=99t pass our sense of = a beneficial cost/benefit ratio.

We = have no objections if others want to take this on.  Centralized = mode Just Works.


And the point of = allowing multiple standardized algorithms to be defined was in the = expectation that more than one might be proven = useful.


Interoperability might also = prove useful. :-)

Tony


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7bit From: internet-drafts@ietf.org To: Cc: lsr@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 7.1.0 Auto-Submitted: auto-generated Precedence: bulk Reply-To: lsr@ietf.org Message-ID: <159067135638.27301.6196743690331978075@ietfa.amsl.com> Date: Thu, 28 May 2020 06:09:16 -0700 Archived-At: Subject: [Lsr] I-D Action: draft-ietf-isis-mpls-elc-13.txt X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 28 May 2020 13:09:17 -0000 A New Internet-Draft is available from the on-line Internet-Drafts directories. This draft is a work item of the Link State Routing WG of the IETF. Title : Signaling Entropy Label Capability and Entropy Readable Label Depth Using IS-IS Authors : Xiaohu Xu Sriganesh Kini Peter Psenak Clarence Filsfils Stephane Litkowski Matthew Bocci Filename : draft-ietf-isis-mpls-elc-13.txt Pages : 8 Date : 2020-05-28 Abstract: Multiprotocol Label Switching (MPLS) has defined a mechanism to load- balance traffic flows using Entropy Labels (EL). An ingress Label Switching Router (LSR) cannot insert ELs for packets going into a given Label Switched Path (LSP) unless an egress LSR has indicated via signaling that it has the capability to process ELs, referred to as the Entropy Label Capability (ELC), on that LSP. In addition, it would be useful for ingress LSRs to know each LSR's capability for reading the maximum label stack depth and performing EL-based load- balancing, referred to as Entropy Readable Label Depth (ERLD). This document defines a mechanism to signal these two capabilities using IS-IS and BGP-LS. The IETF datatracker status page for this draft is: https://datatracker.ietf.org/doc/draft-ietf-isis-mpls-elc/ There are also htmlized versions available at: https://tools.ietf.org/html/draft-ietf-isis-mpls-elc-13 https://datatracker.ietf.org/doc/html/draft-ietf-isis-mpls-elc-13 A diff from the previous version is available at: https://www.ietf.org/rfcdiff?url2=draft-ietf-isis-mpls-elc-13 Please note that it may take a couple of minutes from the time of submission until the htmlized version and diff are available at tools.ietf.org. Internet-Drafts are also available by anonymous FTP at: ftp://ftp.ietf.org/internet-drafts/ From nobody Thu May 28 06:09:29 2020 Return-Path: X-Original-To: lsr@ietf.org Delivered-To: lsr@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id 177233A0EAA; Thu, 28 May 2020 06:09:19 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: internet-drafts@ietf.org To: Cc: lsr@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 7.1.0 Auto-Submitted: auto-generated Precedence: bulk Reply-To: lsr@ietf.org Message-ID: <159067135905.24692.2866479100538276360@ietfa.amsl.com> Date: Thu, 28 May 2020 06:09:19 -0700 Archived-At: Subject: [Lsr] I-D Action: draft-ietf-ospf-mpls-elc-14.txt X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 28 May 2020 13:09:20 -0000 A New Internet-Draft is available from the on-line Internet-Drafts directories. This draft is a work item of the Link State Routing WG of the IETF. Title : Signaling Entropy Label Capability and Entropy Readable Label Depth Using OSPF Authors : Xiaohu Xu Sriganesh Kini Peter Psenak Clarence Filsfils Stephane Litkowski Matthew Bocci Filename : draft-ietf-ospf-mpls-elc-14.txt Pages : 9 Date : 2020-05-28 Abstract: Multiprotocol Label Switching (MPLS) has defined a mechanism to load- balance traffic flows using Entropy Labels (EL). An ingress Label Switching Router (LSR) cannot insert ELs for packets going into a given Label Switched Path (LSP) unless an egress LSR has indicated via signaling that it has the capability to process ELs, referred to as the Entropy Label Capability (ELC), on that LSP. In addition, it would be useful for ingress LSRs to know each LSR's capability for reading the maximum label stack depth and performing EL-based load- balancing, referred to as Entropy Readable Label Depth (ERLD). This document defines a mechanism to signal these two capabilities using OSPFv2 and OSPFv3 and BGP-LS. The IETF datatracker status page for this draft is: https://datatracker.ietf.org/doc/draft-ietf-ospf-mpls-elc/ There are also htmlized versions available at: https://tools.ietf.org/html/draft-ietf-ospf-mpls-elc-14 https://datatracker.ietf.org/doc/html/draft-ietf-ospf-mpls-elc-14 A diff from the previous version is available at: https://www.ietf.org/rfcdiff?url2=draft-ietf-ospf-mpls-elc-14 Please note that it may take a couple of minutes from the time of submission until the htmlized version and diff are available at tools.ietf.org. Internet-Drafts are also available by anonymous FTP at: ftp://ftp.ietf.org/internet-drafts/ From nobody Thu May 28 07:09:26 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 077A13A0EFF; Thu, 28 May 2020 07:09:20 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -9.601 X-Spam-Level: X-Spam-Status: No, score=-9.601 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIMWL_WL_MED=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, SPF_PASS=-0.001, URIBL_BLOCKED=0.001, USER_IN_DEF_DKIM_WL=-7.5] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=cisco.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id eJ8EoWb7RU2O; Thu, 28 May 2020 07:09:18 -0700 (PDT) Received: from aer-iport-3.cisco.com (aer-iport-3.cisco.com [173.38.203.53]) (using TLSv1.2 with cipher DHE-RSA-SEED-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id A34023A0EFE; Thu, 28 May 2020 07:09:17 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=5715; q=dns/txt; s=iport; t=1590674958; x=1591884558; h=subject:to:cc:references:from:message-id:date: mime-version:in-reply-to:content-transfer-encoding; bh=hfb1TwQi+ewVLpedb1O0cdouFKq9Y6+EGUZH+uJ/E1M=; b=QoXVig4jRUG4OgicZUaAsPEeExrOtHfTq6EyNkSKqsVsXiKf58AZxh1/ NeU/yRbJ0Ll3zbigZ6c4vRC7NdBLD01f2ZYluXleMZVQFTLnbsNI6rcT+ yDtLMtd3WmvpTkqcqzpUO/9PwKkFkG0NhIrSdQjrR9XH3U4gDT4wnMxgy o=; X-IPAS-Result: =?us-ascii?q?A0AiAACuxc9e/xbLJq1mGgEBAQEBAQEBAQEDAQEBARIBA?= =?us-ascii?q?QEBAgIBAQEBQIE4AwEBAQELAYFygXUEASAShFGJAYdkJZl2gXwLAQEBDi8EA?= =?us-ascii?q?QGERAKCHCU2Bw4CAwEBAQMCAwEBAQEFAQEBAgEGBG2FY4VyAQEBAQIBIw8BB?= =?us-ascii?q?ToHBQsLDgoCAiYCAlcGAQwIAQGDIoJdIK5WdoEyhVGDY4FAgQ4qAYxdgUE/g?= =?us-ascii?q?RABJwyCXT6EJQGDPIJgBLM6gl6CdpVmBx6CZIkEhGUnjRmQV54SgVoMJoFWM?= =?us-ascii?q?xoIGxWDJU8YDVWPdxeOJz8DZwIGAQcBAQMJixYBJ4IdAQE?= X-IronPort-Anti-Spam-Filtered: true X-IronPort-AV: E=Sophos;i="5.73,444,1583193600"; d="scan'208";a="24265407" Received: from aer-iport-nat.cisco.com (HELO aer-core-2.cisco.com) ([173.38.203.22]) by aer-iport-3.cisco.com with ESMTP/TLS/DHE-RSA-SEED-SHA; 28 May 2020 14:09:13 +0000 Received: from [10.60.140.51] (ams-ppsenak-nitro2.cisco.com [10.60.140.51]) by aer-core-2.cisco.com (8.15.2/8.15.2) with ESMTP id 04SE9Doa009192; Thu, 28 May 2020 14:09:13 GMT To: Scott Bradner , ops-dir@ietf.org Cc: draft-ietf-ospf-te-link-attr-reuse.all@ietf.org, lsr@ietf.org, last-call@ietf.org References: <159059262542.19823.6779966735787003447@ietfa.amsl.com> From: Peter Psenak Message-ID: Date: Thu, 28 May 2020 16:09:13 +0200 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:60.0) Gecko/20100101 Thunderbird/60.7.0 MIME-Version: 1.0 In-Reply-To: <159059262542.19823.6779966735787003447@ietfa.amsl.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit X-Outbound-SMTP-Client: 10.60.140.51, ams-ppsenak-nitro2.cisco.com X-Outbound-Node: aer-core-2.cisco.com Archived-At: Subject: Re: [Lsr] Opsdir last call review of draft-ietf-ospf-te-link-attr-reuse-12 X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 28 May 2020 14:09:20 -0000 Hi Scott, please see inline (##PP): On 27/05/2020 17:17, Scott Bradner via Datatracker wrote: > Reviewer: Scott Bradner > Review result: Not Ready > > This is an OPS-DIR review of OSPF Link Traffic Engineering Attribute Reuse > (draft-ietf-ospf-te-link-attr-reuse) > > This ID describes application-specific attribute advertisements for use in OSPF. > > I found this ID hard to read and recommend that it be reviewed for readability. > > I have a basic question about this proposal – the ID describes specific > advertisements to be used when particular applications want to make use of > specific link attributes and says that other applications should not make of > the information in the advertisement without saying why such use would be a > problem. I can imagine some reasons but it seems to me that it would be good > if this document just explained the problem it is trying to solve. ##PP There are two problems mentioned in the Introduction section: 1) Ambiguity in terms of which of the advertisements are to be used by RSVP-TE and which ones should not be. When RSVP was the only application using these attributes, advertisement of these attributes meant that RSVP was enabled on the link. Such link was considered as a part of the RSVP-TE topology. With other applications using and advertising these link attributes, this logic can not be used anymore, which created the mentioned ambiguity. 2) Lack of support for application specific values for the link attribute. I thought this was clear, but if it is not, please suggest what else needs to be said. > > Some specific issues in the document > > Page 6 – the text says “Standard Application Identifier Bit Mask: Optional set > of bits, where each bit represents a single standard application. Bits are > defined in [I-D.ietf-isis-te-app].” - it seems to me that this should be in an > IANA registry for extensibility but it does not seem to be in the referenced ID > but I could not actually tell ##PP that's a fair point. I have changed to: "Bits are defined in the Link Attribute Application Identifier Registry, which has been defined in [I-D.ietf-isis-te-app]." > > Page 6 – text says “The bits are repeated here for informational purpose” > maybe point to a IANA registry or say “current assignments” ##PP sure, changed to "current assignments” > > Page 6 – text says “If the link attribute advertisement is limited to be used > by a specific set of applications” - maybe say “intended” rather than > “limited” since I do not see a way to actually limit a future application from > eavesdropping on the advertisement ##PP changed to "intended to be only used by" > > Page 7 – the text says “If the SABM or UDABM length is other than 0, 4, or 8, > the ASLA sub-TLV MUST be ignored by the receiver.” - it would seem to be > useful operations-wise to say that an indication of an error should be recorded > somewhere ##PP fair enough, changed to: "MUST be ignored by the receiver and an error SHOULD be logged (subject to rate limiting)." > > Page 7 – a “User Defined Application Identifier” is introduced but never > described – what uses it and what is it used for ##PP we provide a way for the user to advertise link attributes for the purpose of something that is not defined as standardized application. What such application might be is not subject to the specification. > > Section 11 – I found this discussion of the relationship between the existence > of a particular advertisement and the possible existence of an application to > use that advertisement to be quite confusing – if the existence of a particular > advertisement does not indicate that any application is listening why not just > say that? ##PP there are applications where the application enablement on the link is relevant - e.g. RSVP-TE - one need to make sure that RSVP is enabled on the link before sending a RSVP signaling message over it. There are applications, where the enablement of the application on the link is irrelevant and has nothing to do with the fact that some link attributes are advertised for the purpose of such application - e.g. LFA. We have provided full flexibility to support both. > > Section 12.1 – it would help to say what problem is trying to be solved – why > is the use of RSVP-TE LSA advertisements a problem? ##PP please see my response above in the context of the Introduction section. > > Section 12.3.3 – I could not tell if this section is saying that the > application specific attribute advertisements could not be used if there is > even a single legacy router present of if the presence of such a router means > that the application specific attribute advertisements can be used but the old > advertisements must also be used ##PP a) as long as there is a single legacy router present, all routers MUST continue to advertise link attributes using legacy advertisements to allow the legacy router to function properly. b) new advertisements can be used in parallel and they can be used by the routers that do understand them. The text in 12.3.3 says: "Send application specific advertisements while continuing to advertise using legacy (all advertisements are then duplicated)." > Section 14 – it might help to say how new Sub-TLV types can be added to the registry ##PP we are not defining a nynew registry, we only use existing ones. These registries have their own registration procedures. thanks, Peter > > > > > From nobody Thu May 28 10:03:09 2020 Return-Path: X-Original-To: lsr@ietf.org Delivered-To: lsr@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id CC5253A0FC3; Thu, 28 May 2020 10:02:59 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: Linda Dunbar via Datatracker To: Cc: last-call@ietf.org, lsr@ietf.org, draft-ietf-ospf-te-link-attr-reuse.all@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 7.1.0 Auto-Submitted: auto-generated Precedence: bulk Message-ID: <159068537978.29606.17882487660677527802@ietfa.amsl.com> Reply-To: Linda Dunbar Date: Thu, 28 May 2020 10:02:59 -0700 Archived-At: Subject: [Lsr] Genart last call review of draft-ietf-ospf-te-link-attr-reuse-12 X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 28 May 2020 17:03:00 -0000 Reviewer: Linda Dunbar Review result: Not Ready I am the assigned Gen-ART reviewer for this draft. The General Area Review Team (Gen-ART) reviews all IETF documents being processed by the IESG for the IETF Chair. Please treat these comments just like any other last call comments. For more information, please see the FAQ at . Document: draft-ietf-ospf-te-link-attr-reuse-?? Reviewer: Linda Dunbar Review Date: 2020-05-28 IETF LC End Date: 2020-05-29 IESG Telechat date: Not scheduled for a telechat Summary: this document introduces a new link attribute advertisement in OSPFv2 and OSPFv3 to address general link properties needed for new applications, such as Segment Routing. Major issues: The document has good description on the TLV structure of the Application specific Advertisements, but fails to describe what are the NEW Link attributes needed by Segment Routing. Page 7 (section 5) has a really good description on all the link properties added to OSFP (RFC4203, RFC 7308, RFC7471, RFC3630) to achieve TE. I can see Segment Routing would need each node to advertise its own SID and the SIDs of adjacent nodes. Can't they be encoded (or extended) in OSPF's NODE ID? Minor issues: Nits/editorial comments: Best regards, Linda Dunbar From nobody Thu May 28 20:15:00 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id EE8413A08C5 for ; Thu, 28 May 2020 20:14:58 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.087 X-Spam-Level: X-Spam-Status: No, score=-2.087 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_REMOTE_IMAGE=0.01, URIBL_BLOCKED=0.001] autolearn=unavailable autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id aRTblvnwNgsY for ; Thu, 28 May 2020 20:14:56 -0700 (PDT) Received: from mail-io1-xd35.google.com (mail-io1-xd35.google.com [IPv6:2607:f8b0:4864:20::d35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 4BB693A08C1 for ; Thu, 28 May 2020 20:14:56 -0700 (PDT) Received: by mail-io1-xd35.google.com with SMTP id d5so804018ios.9 for ; Thu, 28 May 2020 20:14:56 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=FWK9Y16MRfZSK29KkADfCHVjlj4/Ef68XKSOBL2Qn/0=; b=hrK7wm1JE4dzvCr0fWKn3Y8Q9azR8b8DL2/MsC8Rkth7dfbNw5YxDtLCplsv7q6bLy 43Cd1l+96L1BfB/53lMZLdjyiAB3MyZfgwb7V1e3lyru4/FUjMhlJe0rbGPEjp3wuJZb AWB6rZJbDP7pDWndTZTEXCtHERXaIP6Webuo2Ey7ZS7JmC6u4Ae0RC+bqj9sPJ+mkZdL mxg3IMPshliOekZcSoRihpdgO3h2+sllqAM4h06Ezc1GJODljKAGfTYNk29p5mJal2a7 Kl2mGZmJ4TgW74L6iLRs/va2wp2fux63fDoUioaAx2f/oun4XegRfnZOzK0uSurEUFh4 /6mA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=FWK9Y16MRfZSK29KkADfCHVjlj4/Ef68XKSOBL2Qn/0=; b=OJXHbLYqANFNdhiuEfodGfnlJ6HXwMUC2X806Zg+qT5mpa2E0zdRCrnbsV1Cxhuxy+ 8L7KmOxP/ISikCV8OP0luQpxLlUJB5AbmmkW57VyN0nVZtsFic8ASXGwVT+2s/sG8mpz BEyK+cWl9QsWjOSFqx1uCtv0WejOXsxW00CkFDYC6rxtOMBSkzNkzcU9hVPcQegjzhKq C3LdQi75wQ2YOKgVV1d7B96TEVDXzbretIi2Pp8cB5VmFqGRHh1kG9VLcJRZpOsC5tbf pRHYp+aMh9gogbv+VLHtlfW566o03ng5X2ZtMdqBGGyE3IjPHRBbn01PsYEPFmFp9H9/ gN/w== X-Gm-Message-State: AOAM531Pc75uy9CeRqnrR6wenM193kC8y6PODW0ZHsO29QoZVff4TykZ owoeO3D95RSMXWUWTshpUnGyP6R3+GkG42R28u0= X-Google-Smtp-Source: ABdhPJxXXjbQZgoGkNryMjTmQhmbBuGHYZpmbbm3SxSYnbM/WV+Uv/jlQwnGZIERoF3pbqJonyeXy3jxfnjCcL1tgPY= X-Received: by 2002:a02:1c83:: with SMTP id c125mr5486390jac.112.1590722095553; Thu, 28 May 2020 20:14:55 -0700 (PDT) MIME-Version: 1.0 References: <63330FD6-EDE8-4938-AA85-948279C57E34@cisco.com> <98470E08-B758-45F4-930D-60015D2EAA3B@tony.li> In-Reply-To: From: Gyan Mishra Date: Thu, 28 May 2020 23:14:44 -0400 Message-ID: To: "Les Ginsberg (ginsberg)" Cc: "Acee Lindem (acee)" , Huaimo Chen , "lsr@ietf.org" , "tony.li@tony.li" Content-Type: multipart/alternative; boundary="000000000000711fa905a6c0d9af" Archived-At: Subject: Re: [Lsr] Flooding Topology Computation Algorithm - draft-cc-lsr-flooding-reduction-08 Working Group Adoption Call X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 29 May 2020 03:14:59 -0000 --000000000000711fa905a6c0d9af Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Les & Tony Please see my replies inline On Wed, May 27, 2020 at 1:49 PM Les Ginsberg (ginsberg) wrote: > Tony/Gyan =E2=80=93 > > > > Please find my replies inline. > > > > *From:* Lsr *On Behalf Of * tony.li@tony.li > *Sent:* Wednesday, May 20, 2020 8:48 AM > *To:* Gyan Mishra > *Cc:* lsr@ietf.org; Huaimo Chen ; Acee Lindem > (acee) > *Subject:* Re: [Lsr] Flooding Topology Computation Algorithm - > draft-cc-lsr-flooding-reduction-08 Working Group Adoption Call > > > > > > Hi Gyan, > > > > > > This is a much needed feature that operators have been needing for densel= y > meshed topologies that commonly exist in data centers to accommodate very > high bandwidth E-W traffic. > > > > Thank you. > > > > Please look at the feature description and it does seem to be exactly the > same as this draft. Please confirm. > > > > > > It would appear to be a different, proprietary, and unpublished algorithm= . > > > > > *[Les:] Yes, this is a different algorithm than either > https://datatracker.ietf.org/doc/draft-chen-lsr-dynamic-flooding-algorith= m/ > > or https://datatracker.ietf.org/doc/draft-cc-lsr-flooding-reduction/ > * > * * > > *We are contemplating submitting a draft for this algorithm to the WG.* > > * Gyan> I think that would be good for your customers so it=E2=80=99s no= t > proprietary.* > > > > > > This will give us three different implementations, using three different > algorithms, none of which will inter-operate. Whee!!! :-( > > > > > > *[Les:] As I understand it, draft-chen only supports centralized mode =E2= =80=93 > which is why it is Informational track and does not have interoperability > concerns.* > > *Sarah/Tony - do you have plans to extend this to support distributed mod= e > and then standardize it?* > > > > *At present there are no standard algorithm candidates which have achieve= d > WG status =E2=80=93 though that likely will change very soon.* > > *And the point of allowing multiple standardized algorithms to be defined > was in the expectation that more than one might be proven useful.* > > * Gyan> So along those same lines in theory we could have hypothetically = 3 > algorithms and all three on standards track which would give operators li= ke > Verizon and 3 options to pick from based on the physical topology use cas= e.* > *Caveat would be - would vendors really want to develop other vendors > options at a cost especially if there are more then two or rather keep > their own option proprietary. I think * > There maybe other features that you could get away with interoperability > not being a concern but I think the flooding algorithm I would think woul= d > have to be the same for 2 vendors to be interoperable. > > There maybe other vendors due to industry demand have to get the feature > deployed before it reaches standards vendor consensus with the IETF. > > > > > > Our implementation shipped last year. > > > > *[Les:] As did Cisco=E2=80=99s.* > > > > > > We are testing this feature and planning to deploy but wanted to ensure > that this is the same as the draft on the standards track. > > > > > > It does not appear to be, but someone from Cisco should confirm. > > > > *[Les:] Confirmed.* > > > > * Les* > > > > Tony > > > --=20 *Gyan Mishra* *Network Solutions A**rchitect * *M 301 502-134713101 Columbia Pike *Silver Spring, MD --000000000000711fa905a6c0d9af Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable

Les & Tony=C2=A0

Please see my replies inline=C2=A0
=
On Wed= , May 27, 2020 at 1:49 PM Les Ginsberg (ginsberg) <ginsberg@cisco.com> wrote:

Tony/Gyan =E2=80=93

=C2=A0

Please find my replies inline.

=C2=A0

From: Lsr <lsr-bounces@ietf.org> On Behalf Of tony.li@tony.li Sent: Wednesday, May 20, 2020 8:48 AM
To: Gyan Mishra <hayabusagsm@gmail.com>
Cc: lsr@ietf.org; Huaimo Chen <huaimo.chen@futurewei.com>; Acee Lindem (acee) <acee=3D40cisco.com@d= marc.ietf.org>
Subject: Re: [Lsr] Flooding Topology Computation Algorithm - draft-c= c-lsr-flooding-reduction-08 Working Group Adoption Call

=C2=A0

=C2=A0

Hi Gyan,

=C2=A0



This is a much needed feature that operators have be= en needing for densely meshed topologies that commonly exist in data center= s to accommodate very high bandwidth E-W traffic.

=C2=A0

Thank you.



Please look at the feature description and it doe= s seem to be exactly the same as this draft.=C2=A0 Please confirm.=C2=A0=

=C2=A0

=C2=A0

It would appear to be a different, proprietary, and = unpublished algorithm. =C2=A0

=C2=A0

[Les:] Yes, this = is a different algorithm than either https://datatracker.ietf.org/doc/draft-chen-lsr-dynamic-flooding-algorithm/= or =C2=A0https://datatracker.ietf.org/doc/draft-c= c-lsr-flooding-reduction/

=C2=A0

We are contemplat= ing submitting a draft for this algorithm to the WG.<= /p>

=C2=A0Gyan= > I think that would =C2=A0be good for your customers so it=E2=80=99s no= t proprietary.

=C2=A0

=C2=A0

This will give us three different implementations, u= sing three different algorithms, none of which will inter-operate.=C2=A0 Wh= ee!!! :-(

=C2=A0

=C2=A0

[Les:] As I under= stand it, draft-chen only supports centralized mode =E2=80=93 which is why = it is Informational track and does not have interoperability concerns.

Sarah/Tony - do y= ou have plans to extend this to support distributed mode and then standardi= ze it?

=C2=A0<= /u>

At present there = are no standard algorithm candidates which have achieved WG status =E2=80= =93 though that likely will change very soon.

And the point of = allowing multiple standardized algorithms to be defined was in the expectat= ion that more than one might be proven useful.<= /i>

=C2=A0Gyan> So along those same line= s in theory we could have hypothetically 3 algorithms and all three on stan= dards track which would give operators like Verizon and 3 options to pick f= rom based on the physical topology use case.

<= /div>

Caveat would be - would = vendors really want to develop other vendors options at a cost especially i= f there are more then two or rather keep their own option proprietary.=C2= =A0 I think=C2=A0

There maybe other features that you could get away w= ith interoperability not being a concern but I think the flooding algorithm= I would think would have to be the same for 2 vendors to be interoperable.=

There maybe other vendors due to industry demand = have to get the feature deployed before it reaches standards vendor consens= us with the IETF.

=C2=A0

=C2=A0

Our implementation shipped last year.<= /p>

=C2=A0

[Les:] As did Cis= co=E2=80=99s.

=C2=A0

=C2=A0

We are testing this feature and planning to deplo= y but wanted to ensure that this is the same as the draft on the standards = track.

=C2=A0

=C2=A0

It does not appear to be, but someone from Cisco sho= uld confirm.

=C2=A0

[Les:] Confirmed.=

=C2=A0<= /u>

=C2=A0=C2=A0 Les<= u>

=C2=A0

Tony

=C2=A0

--
--000000000000711fa905a6c0d9af-- From nobody Thu May 28 20:24:49 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 43F9D3A09A2 for ; Thu, 28 May 2020 20:24:48 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.086 X-Spam-Level: X-Spam-Status: No, score=-2.086 tagged_above=-999 required=5 tests=[AC_DIV_BONANZA=0.001, BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_REMOTE_IMAGE=0.01, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 7g1Mk8Hr-LEp for ; Thu, 28 May 2020 20:24:44 -0700 (PDT) Received: from mail-io1-xd2b.google.com (mail-io1-xd2b.google.com [IPv6:2607:f8b0:4864:20::d2b]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 0DB9E3A0984 for ; Thu, 28 May 2020 20:24:44 -0700 (PDT) Received: by mail-io1-xd2b.google.com with SMTP id d5so819929ios.9 for ; Thu, 28 May 2020 20:24:44 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=F2ZUBV2fcieQ4TPD1TeTmHATLU5Quyk1b9DsKuFwByU=; b=f5G2rDad67KroPsjdmiiWUdnobdzvfN5fIJbLenEl6yScSzFAbecgcKAw6iXHgTNc+ u24NJoSQAEj69LOdjv/nddseyZQdWBLrl6A5mwZu61978Nc5T9OZYFLxZIl+ifu2EaSH fU5I8DSlh+dc3R6yyipwyy585MzK423ojJbImxHFw7i5qXmJ0fZdTi4sb+xD31EuzxWN zl0vWjKjf5+ldPAkaehwPw7YuKBWmpDWoC/HP4/kpYic99Q2WKFO82cOKxXaudgO1GpC GSlUjTCki2YcvDVrMjmhAXgZVmVacS9qPjn3HJHdRSzig9C52BeNofOFSxh5Fvi4+cUj k37g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=F2ZUBV2fcieQ4TPD1TeTmHATLU5Quyk1b9DsKuFwByU=; b=oOEv2hMAid0F0D6HU1tT2SSvv6PPVlOpDlQRcLnJ4pXJlZ13XouB8jBbOFp1LZGaAj 9DvPzPRnlzxrVLS8aXB+fyhkFjJzVSWej09nWzn35yKR8bK/PWro/DDTiV9bwsRZoPb1 PAOZLil+MGXjvo7Wc1qewhv116p/hVRb0hckfUGJ7Kia1AW/3cZSX/0s/9L8ds4T/Mgv eL8Fdy9NZ1Lavs7mk1OW+O20SaEWwXuQXgRQw6SaYvygfNI/CUTgPHCFHuVq10LQz+jK NNctgJcjVVJny5zyXTE/N3OCtZVAIhVI5hYRnXKPB3wqM81jGC5eWgOURaAKVA2JSiKF rAgA== X-Gm-Message-State: AOAM533CKrf02RXQwXQxm7txZ870pOg7q6bVsUkEzbEjZisoluHjMTHT tNE53b4UODu/Fkt58vh4r9kIh6Gb5ZoLnsT17K0= X-Google-Smtp-Source: ABdhPJwe2HBARURY8NxAuDj3xtcTbJ7RY+deL8HWimAVmKhA1uq8rb2fnDAoU6/1+44CCICGpu3muDBaGaEitfjLqmo= X-Received: by 2002:a6b:fc0d:: with SMTP id r13mr4976059ioh.40.1590722681772; Thu, 28 May 2020 20:24:41 -0700 (PDT) MIME-Version: 1.0 References: <63330FD6-EDE8-4938-AA85-948279C57E34@cisco.com> <424B17B1-D66D-4708-A819-855E972841AF@cisco.com> In-Reply-To: From: Gyan Mishra Date: Thu, 28 May 2020 23:24:07 -0400 Message-ID: To: Huaimo Chen Cc: "Acee Lindem (acee)" , "lsr@ietf.org" Content-Type: multipart/alternative; boundary="000000000000621fac05a6c0fc17" Archived-At: Subject: Re: [Lsr] Flooding Topology Computation Algorithm - draft-cc-lsr-flooding-reduction-08 Working Group Adoption Call X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 29 May 2020 03:24:48 -0000 --000000000000621fac05a6c0fc17 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hi Huaimo Thank you for answering my questions. Replies in-line On Sun, May 24, 2020 at 10:25 PM Huaimo Chen wrote: > Hi Gyan, > > Thanks much for your comments and suggestions. My answers/explanation= s > are inline below. > > Best Regards, > Huaimo > ------------------------------ > *From:* Gyan Mishra > *Sent:* Friday, May 22, 2020 9:11 PM > *To:* Huaimo Chen > *Cc:* Acee Lindem (acee) ; lsr@ietf.org > *Subject:* Re: [Lsr] Flooding Topology Computation Algorithm - > draft-cc-lsr-flooding-reduction-08 Working Group Adoption Call > > Hi Huaimo > > Thinking about physical topology a little further as with the FT algorith= m > it makes sense to decouple the FT from the physical however the overall > coverage is based on those basic parameters of degree number of links and > nodes as well as width and depth of the topology. > [HC]: We may add/think more about physical topology and reduce/simplify > the description about parameters in the draft. > Gyan>. Thank you I think that would be really helpful adding other physical topologies other then full mesh and if you can do clos 3 tier and leaf/spine would be great. Simplify parameter descriptions would be very helpful. > > Thinking about it further the clos leaf spine DC style topology is much > worse in terms of flooding due to physical topology that leafs don=E2=80= =99t > physical connection and are interconnected via the spine creating massive > ECMP and overload of the spine super spine. So the physical DC leaf spin= e > topology really exacerbates the flooding due to the non full mesh nature = of > the topology. > [HC]: You are right. The clos leaf spine topology is much worse. The > algorithm in the draft can be used to compute FT for the clos leaf spine > topology and reduce the number of links used for flooding significantly. > Gyan> Adding the other physical would help visualize how the algorithm works with all topologies. In reading the draft I did not get that the algorithm would work for clos or leaf/spine so maybe need to add verbiage to clarify. > > With a service provider core which is typically a mesh style multi tier > multiple concentric circles mix of full and partial mesh and hub spoke ty= pe > physical topologies. > > So with flooding with full mesh every node connects with every node so yo= u > don=E2=80=99t have an overload of flooding being funneled through a super= spine as > you do with a leaf spine DC architecture. So in a full mesh which is the > best case scenario for flooding perspective from my point of view which > each node as root connects to all nodes and then you can iteratively grow > the flooding scope and it=E2=80=99s pretty controlled and you can limit t= he > redundant flooding. When the physical topology changes to a much more > partially meshed the ECMP paths grow astronomically as does the flooding > and longer convergence time. > > So I think in the slide deck and draft look at scenario where their is > tremendous ECMP from partial meshing and how the flood reduction algorith= m > improves the flooding and convergence. > [HC]: They should have more scenarios including clos spine leafs. The > reason for not having them in the draft is that "drawing" topology of clo= s > spine leaf to illustrate the algorithm in details is very hard. > > Kind regards > > Gyan > > On Fri, May 22, 2020 at 8:41 PM Gyan Mishra wrote= : > > Hi Huaimo > > Thank you for the slide deck. That really helps understand the algorithm= . > > > I will let you know if I have any questions. > > The goal of the algorithm is to speed up convergence by limiting the > convergence scope and expanding out 1 link at a time until all nodes and > links are part of the flood scope. From the examples in the slide deck I > did not see mentioned what is done with the dynamic flooding algorithm > where when you have a meshed network in the slide 5 examples, how do you > limit the flooding on redundant links duplicate flooding with the many > meshed paths as you iteratively grow the FT nodes scope Cq(). I believe > with the dynamic flooding it does a degree of 2 so 2 links between nodes. > > I think with clos spine leaf the mesh is much more intensive and > problematic with ECMP then a circular topology nodal mesh that results in > duplicate redundant flooding that slows down convergence. With spine lea= f > it=E2=80=99s like an X horizontal width axis and then depth is spine to l= eaf > links. With spine leaf as you grow sideways and the spine expand the > redundant ECMP grows and redundant flooding grows exponentially and is mu= ch > worse then circular nodal mesh. > > Thank you > > Gyan > > On Fri, May 22, 2020 at 10:05 AM Huaimo Chen > wrote: > > Hi Gyan, > > Thanks much for your questions. My answers/explanations are inline > below. > > Best Regards, > Huaimo > ------------------------------ > *From:* Gyan Mishra > *Sent:* Thursday, May 21, 2020 10:13 PM > *To:* Acee Lindem (acee) > *Cc:* Huaimo Chen ; lsr@ietf.org > *Subject:* Re: [Lsr] Flooding Topology Computation Algorithm - > draft-cc-lsr-flooding-reduction-08 Working Group Adoption Call > > > I think for both drafts it would be good to have a stick diagram at a > minimum. > [HC]: A diagram for illustrating the steps of the algorithm is in Appendi= x. > I majored in EE with math minor and both drafts are hard to follow > without a diagram with labels showing the exact topology examples. > > Four main topologies - full mesh, partial mesh and leaf spine ( 2 tier) > and CLOS ( 3 tier) - real world scenario=E2=80=99s. > > From the interim meeting was their a slide deck visual topology shared? > [HC]: The set of slides presented in IETF 105 is attached. > > That would help. > > https://datatracker.ietf.org/doc/html/draft-cc-lsr-flooding-reduction-08 > > > 4.1 > > Step 1 - Build Cq candidate queue > > For each node B on FT whose D is one (from minimum to maximum > node ID), find a link L attached to B such that L's remote node R > has minimum D and ID, add link L between B and R into FT and > increase B's D and R's D by one. Return FT. > > My interpretation is the algorithm an iterative loop and starts with any > node in the candidate list so could start from edge and work left to righ= t > or vice versa. For loop to build FT from Cq =3D with each node B with > directly attached node R via link L. Increment node B from Cq until the = FT > is build for all nodes. Instead of starting with a wide diameter FT > matching physical topology we start micro topology with D=3D1 and go node= by > node. > [HC]: This (For each node B on FT .... Return FT.) is an iterative loop > after every node is added to FT. This loop connects each node whose D =3D= 1 > (i.e., there is only one link attached to it on FT) to a node through a > link on FT (i.e., add the link to FT) to make every node on FT to have it= s > D > 1. Page 5 of the attached slides shows some details for this loop. > > 4.2 > > 1. Finding and removing the first element with node A in Cq that is > not on FT and one PH's D in PHs < MaxD and PH's D < PH's ConMaxD. > > If A is root R0, then add the element into FT > > otherwise (i.e., A !=3D R0 with one PH's D in PHs < MaxD and PH's > D < PH's ConMaxD. Assume that PH is the first one in PHs > whose D < MaxD and PH's D < PH's ConMaxD), PH's D++, and add A > with D =3D 1 and PHs =3D {PH} into FT. > > Note: if there is no element with a node in Cq satisfying the > conditions, then algorithm may be restarted from R0, ++MaxD, > Cq =3D {(R0,D=3D0,PHs =3D { })}, FT =3D { }; > > This is similar to 4.1 with micro topology with 2 directly connected node= s > [HC]: It is similar to 1. in section 4.1. > > https://www.ietf.org/id/draft-chen-lsr-dynamic-flooding-algorithm-00.html > > > My interpretation of the algorithm from the verbiage. > > So this draft starts in the middle of the topology and is geared towards > leaf spine 2 or 3 tier clos topology. > > For this one we build the bi graph so that could be leaf connected to two > spines or spine connected to two leafs and iteratively build out the FT > topology 3 node arch spine leaf spine or leaf spine leaf. > > Kind regards > > Gyan > > On Thu, May 21, 2020 at 7:01 PM Acee Lindem (acee) wrote= : > > Hi Gyan, > > > > *From: *Gyan Mishra > *Date: *Thursday, May 21, 2020 at 4:20 PM > *To: *Acee Lindem > *Cc: *Huaimo Chen , "lsr@ietf.org" < > lsr@ietf.org> > *Subject: *Re: [Lsr] Flooding Topology Computation Algorithm - > draft-cc-lsr-flooding-reduction-08 Working Group Adoption Call > > > > > > Yes and I have started reviewing the LSR mail archives as I am late in th= e > discussion for this. > > > > If you have link to any particular dates in the archives would be helpful= . > > > > No =E2=80=93 it was more an =E2=80=9Cevolution=E2=80=9D than an =E2=80=9C= epiphany=E2=80=9D. > > > > That sums up all the questions I have so if all answered in the archives > then I am all set. > > > > I support the draft moving forward as flood reduction is a much needed > feature. > > > > I think overall both drafts will really help large data centers with any > overlay underlay vxlan spine leaf meshed CLOS highly meshed topology that > scales out horizontally with a large spine footprint - this is a much muc= h > needed feature. This also helps eliminate complexity of the workaround o= f > using BGP in the underlay which to me adds tremendous complexity. > > > > Here is the other recently presented dynamic flooding draft. > > > > https://datatracker.ietf.org/doc/draft-chen-lsr-dynamic-flooding-algorith= m/ > > > > > You can see they both make use of the dynamic flooding infra in > https://datatracker.ietf.org/doc/draft-ietf-lsr-dynamic-flooding/ > > > > > Thanks, > > Acee > > > > > > > > > > Kind regards > > > > Gyan > > > > On Thu, May 21, 2020 at 4:07 PM Acee Lindem (acee) wrote= : > > Speaking as WG Co-chair: > > > > Hi Gyan, > > > > I guess you=E2=80=99ve joined this discussion late. It might be a good id= ea to > review the LSR mailing list archives. > > > > *From: *Gyan Mishra > *Date: *Thursday, May 21, 2020 at 1:51 PM > *To: *Huaimo Chen > *Cc: *Acee Lindem , "lsr@ietf.org" > *Subject: *Re: [Lsr] Flooding Topology Computation Algorithm - > draft-cc-lsr-flooding-reduction-08 Working Group Adoption Call > > > > > > > > On Thu, May 21, 2020 at 11:01 AM Huaimo Chen > wrote: > > Hi Gyan, > > > > Thanks much for your questions. > > > > Gyan> How does this draft compare to the WG LC draft for flood > reduction. Would they be two eventual standard options in the operators > toolbox or competing features for optimized flood reduction. Would havin= g > two flood reduction features standardized versus one default IGP flood > reduction feature be confusing for operators. Just as it was confusing t= o > me. > > https://datatracker.ietf.org/doc/draft-ietf-lsr-dynamic-flooding/ > > > > > [HC]: This draft plus the draft for flooding reduction can provide tw= o > modes of flooding reductions (i.e., centralized mode and distributed mode= ). > The latter describes the two modes, but does not include any flooding > topology computation algorithm for the distributed mode. The former > proposes a flooding topology computation algorithm to be used in the > distributed mode. > > > > Gyan> It maybe a good idea for both documents to reference each other > as to how they play together or in some respects if any provide a > homogeneous complete holistic solution for flooding problem being solved. > > > > It is a good idea to have this new draft reference the dynamic-flooding > but not vice-versa. The existing dynamic flooding draft provides a > framework for any dynamic flooding algorithm that provides a separate > flooding topology. This algorithm is just the first to be formally propos= ed > in a draft. Note that another algorithm was presented during the LSR > virtual interim which replaced IETF 107. > > > > In my opinion it may not be a bad idea even to combine both drafts so the > solution is complete and holistic. This will also make the overall > specification flow nicely. > > > > No =E2=80=93 we=E2=80=99re not going to do this. > > > > Thanks, > > Acee > > > > I know that efforts were made by LSR to have a common IGP solution, > however there are many inherent differences between ISIS and OSPF that fr= om > IGP Link state protocol perspective you can treat like apples to apples b= ut > really it=E2=80=99s apples and oranges. Maybe it might we wise to have s= eparate > draft for both and have references linking together as the same algorithm > concept and mathematically however the actual code implementation would > vary as the LSDB link state data structures are completely different. > > > > Later =3D Dynamic flooding =3D 2 modes Centralized leader based and > distributed > > > > https://datatracker.ietf.org/doc/draft-ietf-lsr-dynamic-flooding/ > > > > > This later draft per section excerpt provides both centralized and > distributed algorithm see below > > > > *6.4 = . Area Leader Responsibilities* > > > > If the Area Leader operates in centralized mode, it MUST advertise > > algorithm 0 in its Area Leader Sub-TLV. In order for Dynamic > > Flooding to be enabled it also MUST compute and advertise a flooding > > topology for the area. The Area Leader may update the flooding > > topology at any time, however, it should not destabilize the network > > with undue or overly frequent topology changes. If the Area Leader > > operates in centralized mode and needs to advertise a new flooding > > topology, it floods the new flooding topology on both the new and old > > flooding topologies. > > > > If the Area Leader operates in distributed mode, it MUST advertise a > > non-zero algorithm in its Area Leader Sub-TLV. > > > > When the Area Leader advertises algorithm 0 in its Area Leader Sub- > > TLV and does not advertise a flooding topology, Dynamic Flooding is > > disabled for the area. Note this applies whether the Area Leader > > intends to operate in centralized mode or in distributed mode. > > > > Note that once Dynamic Flooding is enabled, disabling it risks > > destabilizing the network. > > > > *6.5 . Distributed Flooding Topology Calculation* > > > > If the Area Leader advertises a non-zero algorithm in its Area Leader > > Sub-TLV, all nodes in the area that support Dynamic Flooding and the > > value of algorithm advertised by the Area Leader MUST compute the > > flooding topology based on the Area Leader's advertised algorithm. > > > > Nodes that do not support the value of algorithm advertised by the > > Area Leader MUST continue to use standard flooding mechanism as > > defined by the protocol. > > > > Nodes that do not support the value of algorithm advertised by the > > Area Leader MUST be considered as Dynamic Flooding incapable nodes by > > the Area Leader. > > > > If the value of the algorithm advertised by the Area Leader is from > > the range 128-254 (private distributed algorithms), it is the responsi= bility of the > > network operator to guarantee that all nodes in the area have a common un= derstanding of what the given algorithm value represents. > > > > Former =3D WG LC > > https://datatracker.ietf.org/doc/html/draft-cc-lsr-flooding-reduction-08 > > > > > Provides algorithm for distributed mode for this draft as well as the > algorithm to be used for distributed mode later dynamic flooding draft > > > > Separate question- > > > > In light of the flooding algorithm and seeing that at the bottom of > section 6.5 mentions flooding algorithm are the IANA codepoints reserved > for flooding unique and non overlapping with the flex algo codepoints I > believe 0-127. I would think the flooding algorithm range of values is > completely separate since a different function then flex algo values. > > > > https://datatracker.ietf.org/doc/html/draft-ietf-lsr-flex-algo-07 > > > > > > > Best Regards, > > Huaimo > ------------------------------ > > *From:* Gyan Mishra > *Sent:* Thursday, May 21, 2020 10:36 AM > > > *To:* Huaimo Chen > *Cc:* Acee Lindem (acee) ; lsr@ietf.or= g < > lsr@ietf.org> > *Subject:* Re: [Lsr] Flooding Topology Computation Algorithm - > draft-cc-lsr-flooding-reduction-08 Working Group Adoption Call > > > > > > > > On Wed, May 20, 2020 at 11:59 PM Huaimo Chen > wrote: > > Hi Gyan, > > > > Thanks much for your questions. My answers are inline below with [HC]= . > > > > Best Regards, > > Huaimo > ------------------------------ > > *From:* Gyan Mishra > *Sent:* Wednesday, May 20, 2020 11:14 AM > *To:* Huaimo Chen > *Cc:* Acee Lindem (acee) ; lsr@ietf.or= g < > lsr@ietf.org> > *Subject:* Re: [Lsr] Flooding Topology Computation Algorithm - > draft-cc-lsr-flooding-reduction-08 Working Group Adoption Call > > > > Huaimo > > > > This is a much needed feature that operators have been needing for densel= y > meshed topologies that commonly exist in data centers to accommodate very > high bandwidth E-W traffic. > > [HC]: Thank you very much. > > > > Below is link from Cisco which has introduced feature for dynamic floodin= g > in clos high density ECMP data center topologies. > > > > Please look at the feature description and it does seem to be exactly the > same as this draft. Please confirm. > > [HC]: It seems different. > > > > There maybe other vendors due to industry demand have to get the feature > deployed before it reaches standards vendor consensus with the IETF. > > > > > https://www.cisco.com/c/en/us/products/collateral/switches/nexus-9000-ser= ies-switches/white-paper-c11-743015.html > > > > > We are testing this feature and planning to deploy but wanted to ensure > that this is the same as the draft on the standards track. > > [HC]: The feature appears implemented draft "Dynamic Flooding on Dense > Graphs", which does not include any flooding topology computation > algorithm.. > > > > Gyan> How does this draft compare to the WG LC draft for flood > reduction. Would they be two eventual standard options in the operators > toolbox or competing features for optimized flood reduction. Would havin= g > two flood reduction features standardized versus one default IGP flood > reduction feature be confusing for operators. Just as it was confusing t= o > me. > > > > > > https://datatracker.ietf.org/doc/draft-ietf-lsr-dynamic-flooding/ > > > > > Kind regards > > > > Gyan > > > > > > On Tue, May 19, 2020 at 11:52 PM Huaimo Chen > wrote: > > Hi Gyan, > > > > Thank you very much for your questions and support. > > > > This Flooding Topology Computation algorithm can be used in the > Dynamic Flooding on Dense Graphs to compute the flooding topologies for > the data center clos dense meshed topologies with many ECMP paths. It can > be used by the area leader in the centralized mode to compute the floodin= g > topology. > > > > Best Regards, > > Huaimo > ------------------------------ > > *From:* Lsr on behalf of Gyan Mishra < > hayabusagsm@gmail.com> > *Sent:* Tuesday, May 19, 2020 2:39 AM > *To:* Yanhe Fan > *Cc:* lsr@ietf.org ; Acee Lindem (acee) 40cisco.com@dmarc.ietf.org> > *Subject:* Re: [Lsr] Flooding Topology Computation Algorithm - > draft-cc-lsr-flooding-reduction-08 Working Group Adoption Call > > > > > > I support WG adoption and have a few questions related to the draft. > > > > Does this flooding algorithm use the dynamic flooding algorithm used in > data center clos dense meshed topologies with many ECMP paths where the > flood is decoupled from the physical topology. In the dynamic flooding > algorithm mentioned in centralized mode the flooding is computed by the > area leader and distributed to all nodes. In distributed mode each mode > the area leader determines the algorithm and then each node computes the > flooding topology based on the algorithm. > > > > This dynamic algorithm for optimized flood reduction would reduce the > amount of redundant flooding in highly densely meshed ospf or Isis > topologies. So this optimization of flooding would improving overall lin= k > state routing protocol convergence. > > > > Gyan > > > > On Mon, May 18, 2020 at 3:37 PM Yanhe Fan wrote: > > Support it as a co-author. > > > > Thanks, > > Yanhe > > > > *From:* Lsr *On Behalf Of *Acee Lindem (acee) > *Sent:* Friday, May 15, 2020 3:40 PM > *To:* lsr@ietf.org > *Subject:* [Lsr] Flooding Topology Computation Algorithm - > draft-cc-lsr-flooding-reduction-08 Working Group Adoption Call > > > > This begins a 3 week (due to holidays) WG adoption call for the =E2=80=9C= Flooding > Topology Computation Algorithm=E2=80=9D draft. Please issue your support = or > objection to this list by 11:59 PM, UTC on June 5th, 2020. Here is a URL > for your convenience. > > > > https://datatracker.ietf.org/doc/draft-cc-lsr-flooding-reduction/ > > > > > Thanks, > Acee > > _______________________________________________ > Lsr mailing list > Lsr@ietf.org > https://www.ietf.org/mailman/listinfo/lsr > > > -- > > *Error! Filename not specified.* > > > *Gyan > Mishra* > > > *Network > Solutions Architect * > > > > > > *M 301 502-1347 > 13101 > Columbia Pike > > *Silver Spring, MD > > > > > -- > > *Error! Filename not specified.* > > > *Gyan Mishra* > > *Network Solutions Architect * > > > > *M 301 502-1347 > 13101 > Columbia Pike > > *Silver Spring, MD > > > > > > > > > -- > > *Error! Filename not specified.* > > > *Gyan Mishra* > > *Network Solutions Architect * > > > > *M 301 502-1347 13101 Columbia Pike > > *Silver Spring, MD > > > > > > > > > > > -- > > *Error! Filename not specified.* > > > *Gyan Mishra* > > *Network Solutions Architect * > > > > *M 301 502-1347 13101 Columbia Pike > > *Silver Spring, MD > > > > > > > > > > > -- > > [image: Image removed by sender.] > > > *Gyan Mishra* > > *Network Solutions Architect * > > > > *M 301 502-1347 13101 Columbia Pike > > *Silver Spring, MD > > > > > > > > > > > -- > > > > > *Gyan Mishra* > > *Network Solutions A**rchitect * > > > *M 301 502-1347 > * > > -- *Gyan Mishra* *Network Solutions A**rchitect * *M 301 502-134713101 Columbia Pike *Silver Spring, MD --000000000000621fac05a6c0fc17 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable

Hi Huaimo

=
Thank you for answering my questions.

Replies in-line

On Sun, May 24, 2020= at 10:25 PM Huaimo Chen <h= uaimo.chen@futurewei.com> wrote:
Hi Gyan,

=C2=A0 =C2=A0 Thanks much for your comments and suggestions. My answers/exp= lanations are inline below.

Best Regards,
Huaimo
From: G= yan Mishra <h= ayabusagsm@gmail.com>
Sent: Friday, May 22, 2020 9:11 PM
To: Huaimo Chen <huaimo.chen@futurewei.com>
Cc: Acee Lindem (acee) <acee@cisco.com>; lsr@ietf.org <lsr@ietf.org>
Subject: Re: [Lsr] Flooding Topology Computation Algorithm - draft-c= c-lsr-flooding-reduction-08 Working Group Adoption Call
=C2=A0
Hi Huaimo

Thinking about physical topology a little further as with= the FT algorithm it makes sense to decouple the FT from the physical howev= er the overall coverage is based on those basic parameters of degree number= of links and nodes as well as width and depth of the topology.
[HC]: We may add/think more about physical=C2=A0topology and reduce/simplify the description about parameters in the draft.

=C2=A0 =C2=A0 Gyan>. Thank you I = think that would be really helpful adding other physical topologies other t= hen full mesh and if you can do clos 3 tier and leaf/spine would be great. = Simplify parameter descriptions would be very helpful.

Thinking about it further the clos leaf spine DC style to= pology is much worse in terms of flooding due to physical topology that lea= fs don=E2=80=99t physical connection and are interconnected via the spine c= reating massive ECMP and overload of the spine super spine.=C2=A0 So the physical DC leaf spine topology really exacerbat= es the flooding due to the non full mesh nature of the topology. =C2=A0
[HC]: You are right. The=C2=A0clos leaf spine=C2=A0topology=C2=A0is much worse. The algorithm in the draft can be used to compute FT for the clos leaf spi= ne topology and reduce the number of links used for flooding significantly.= =C2=A0
=
=C2=A0 =C2=A0 Gyan> Adding the other physica= l would help visualize how the algorithm works with all topologies.=C2=A0 I= n reading the draft I did not get that the algorithm would work for clos or= leaf/spine so maybe need to add verbiage to clarify.

With a service provider core which is typically a mesh st= yle multi tier multiple concentric circles mix of full and partial mesh and= hub spoke type physical topologies. =C2=A0

So with flooding with full mesh every node connects with = every node so you don=E2=80=99t have an overload of flooding being funneled= through a super spine as you do with a leaf spine DC architecture.=C2=A0 S= o in a full mesh which is the best case scenario for flooding perspective from my point of view which each node as root con= nects to all nodes and then you can iteratively grow the flooding scope and= it=E2=80=99s pretty controlled and you can limit the redundant flooding.= =C2=A0 When the physical topology changes to a much more partially meshed the ECMP paths grow astronomically as does the = flooding and longer convergence time.

So I think in the slide deck and draft look at scenario w= here their is tremendous ECMP from partial meshing and how the flood reduct= ion algorithm improves the flooding and convergence.
[HC]: They should have more=C2=A0s= cenarios including clos spine leafs. The reason for not having them in the draft is= that "drawing" topology of clos spine leaf to illustrate the alg= orithm in details is very hard.=C2=A0

Kind regards=C2=A0

Gyan=C2=A0

On Fri, May 22, 2020 at 8:41 PM Gyan Mishra <hayabusagsm@gmail.com&= gt; wrote:
Hi Huaimo

Thank you for the slide deck.=C2=A0 That really helps und= erstand the algorithm. =C2=A0

I will let you=C2=A0know if I have any questions.

The goal of the algorithm is to speed up convergence by l= imiting the convergence scope and expanding out 1 link at a time until all = nodes and links are part of the flood scope.=C2=A0 From the examples in the= slide deck I did not see mentioned what is done with the dynamic flooding algorithm where when you have a meshed n= etwork in the slide 5 examples, how do you limit the flooding on redundant = links duplicate flooding with the many meshed paths as you iteratively grow= the FT nodes scope Cq().=C2=A0 I believe with the dynamic flooding it does a degree of 2 so 2 links between nodes. = =C2=A0

I think with clos spine leaf the mesh is much more intens= ive and problematic with ECMP then a circular topology nodal mesh that resu= lts in duplicate redundant flooding that slows down convergence.=C2=A0 With= spine leaf it=E2=80=99s like an X horizontal width axis and then depth is spine to leaf links.=C2=A0 With spine leaf as you g= row sideways and the spine expand the redundant ECMP grows and redundant fl= ooding grows exponentially and is much worse then circular nodal mesh. =C2= =A0

Thank you=C2=A0

Gyan

On Fri, May 22, 2020 at 10:05 AM Huaimo Chen <huaimo.chen@futurew= ei.com> wrote:
Hi Gyan,

=C2=A0 =C2=A0 Thanks much for your questions. My answers/explanations are i= nline below.

Best Regards,
Huaimo
From: Gyan Mishra <hayabusagsm@gmail.com>
Sent: Thursday, May 21, 202= 0 10:13 PM
To: Acee Lindem (acee) <= acee@cisco.com>
Cc: Huaimo Chen <huaimo.chen@futurewei.com>; lsr@ietf.org <lsr@ietf.org>
Subject: Re: [Lsr] Flooding= Topology Computation Algorithm - draft-cc-lsr-flooding-reduction-08 Workin= g Group Adoption Call
=C2=A0

I think for both drafts it would be good to have a stick = diagram at a minimum. =C2=A0
[HC]: A diagram for illustrating the steps of the algorit= hm is in Appendix.
I majored in EE with math =C2=A0minor and both drafts are= hard to follow without a diagram with labels showing the exact topology ex= amples. =C2=A0

Four main topologies - full mesh, partial mesh and leaf s= pine ( 2 tier) and CLOS ( 3 tier) - real world scenario=E2=80=99s.

From the interim meeting was their a slide deck visual to= pology shared?=C2=A0
[HC]: The set of slides presented in IETF 105 is attached= .

That would help.

4.1=C2=A0

Step 1 - Build Cq candidate queue=C2=A0

For each node B on FT whose D is one (from minimum to maximum
       node ID), find a link L attached to B such that L's remote node =
R
       has minimum D and ID, add link L between B and R into FT and
       increase B's D and R's D by one.  Return FT.
My interpretation is the algorithm an iterative loop and = starts with any node in the candidate list so could start from edge and wor= k left to right or vice versa.=C2=A0 For loop to build FT from Cq =3D with = each node B with directly attached node R via link L.=C2=A0 Increment node B from Cq until the FT is build for all n= odes.=C2=A0 Instead of starting with a wide diameter FT matching physical t= opology we start micro topology with D=3D1 and go node by node.
[HC]: This (For each node B on FT .... Return FT.) is=C2= =A0an iterative loop after every node is added to FT. This loop connects ea= ch node whose D =3D 1 (i.e., there is only one link attached to it on FT) to a node through a link on FT (i.e., add t= he link to FT) to make every node on FT to have its D > 1. Page 5 of the= attached slides shows some details for this loop.

4.2=C2=A0

1.  Finding and removing the first element with node A in Cq that is
       not on FT and one PH's D in PHs < MaxD and PH's D < PH=
's ConMaxD.

       If A is root R0, then add the element into FT

       otherwise  (i.e., A !=3D R0 with one PH's D in PHs < MaxD and=
 PH's
          D < PH's ConMaxD.  Assume that PH is the first one in PHs
          whose D < MaxD and PH's D < PH's ConMaxD), PH's=
 D++, and add A
          with D =3D 1 and PHs =3D {PH} into FT.

       Note:  if there is no element with a node in Cq satisfying the
          conditions, then algorithm may be restarted from R0, ++MaxD,
          Cq =3D {(R0,D=3D0,PHs =3D { })}, FT =3D { };
This is similar to 4.1 with micro topology with 2 directl= y connected nodes=C2=A0
[HC]: It is similar to 1. in section 4.1.

My interpretation of the algorithm from the verbiage.

So this draft starts in the middle of the topology and is= geared towards leaf spine 2 or 3 tier clos topology.

For this one we build the bi graph so that could be leaf = connected to two spines or spine connected to two leafs and iteratively bui= ld out the FT topology 3 node arch =C2=A0spine leaf spine or leaf spine lea= f.

Kind regards=C2=A0

Gyan

On Thu, May 21, 2020 at 7:01 PM Acee Lindem (acee) <acee@cisco.com> wro= te:

Hi Gyan,

=C2=A0

From: Gyan Mishra <hayabusagsm@gmail.com>= ;
Date: Thursday, May 21, 2020 at 4:20 PM
To: Acee Lindem <acee@cisco.com>
Cc: Huaimo Chen <huaimo.chen@futurewei.com>, "lsr@ietf.org" <lsr@ietf.org>
Subject: Re: [Lsr] Flooding Topology Computation Algorithm - draft-c= c-lsr-flooding-reduction-08 Working Group Adoption Call

=C2=A0

=C2=A0

Yes and I have started reviewing the LSR mai= l archives as I am late in the discussion for this.

=C2=A0

If you have link to any particular dates in = the archives would be helpful.

=C2=A0

No =E2=80=93 it was more an =E2=80=9Cevolution=E2=80=9D than an =E2=80= =9Cepiphany=E2=80=9D.

=C2=A0

That sums up all the questions I have so if = all answered in the archives then I am all set.

=C2=A0

I support the draft moving forward as flood = reduction is a much needed feature. =C2=A0

=C2=A0

I think overall both drafts will really help= large data centers with any overlay underlay vxlan spine leaf meshed CLOS = highly meshed topology that scales out horizontally with a large spine foot= print - this is a much much needed feature.=C2=A0 This also helps eliminate complexity of the workaround of u= sing BGP in the underlay which to me adds tremendous complexity.<= /u>

=C2=A0

Here is the other recently presented dynamic flooding draft.

=C2=A0

https://datatracker.ietf.org/doc/draft-chen-lsr= -dynamic-flooding-algorithm/

=C2=A0

You can see they both make use of the dynamic flooding infra in https://datatracker.ietf.org/doc/draft-ietf-lsr-dynamic-flooding/

=C2=A0

Thanks,

Acee

=C2=A0

=C2=A0

=C2=A0

=C2=A0

Kind regards=C2=A0

=C2=A0

Gyan=C2=A0

=C2=A0

On Thu, May 21, 2020 at 4:07 PM Acee Lindem = (acee) <acee@cisco.c= om> wrote:

Speaking as WG Co-chair:

=C2=A0

Hi Gyan,

=C2=A0

I guess you=E2=80=99ve joined this discussio= n late. It might be a good idea to review the LSR mailing list archives.

=C2=A0

= From: Gyan Mishra <hayabusagsm@gmail.com>= ;
Date: Thursday, May 21, 2020 at 1:51 PM
To: Huaimo Chen <huaimo.chen@futurewei.com>
Cc: Acee Lindem <acee@cisco.com>, "lsr@ietf.org" <lsr@ietf.org>
Subject: Re: [Lsr] Flooding Topology Computation Algorithm - draft-c= c-lsr-flooding-reduction-08 Working Group Adoption Call

=C2=A0

=C2=A0

=C2=A0

On Thu, May 21, 2020 at 11:01 AM Huaimo Chen &= lt;huaimo.ch= en@futurewei.com> wrote:

Hi = Gyan,

=C2= =A0

=C2= =A0 =C2=A0 Thanks much for your questions.

=C2= =A0

=C2= =A0Gyan> How does this draft compare to the WG LC draft for flood reduct= ion.=C2=A0 Would they be two eventual standard options in the operators too= lbox =C2=A0or competing features for optimized flood reduction. Would having two flood reduction features standardized versus o= ne default IGP flood reduction feature be confusing for operators.=C2=A0 Ju= st as it was confusing to me.=C2=A0

=C2= =A0

=C2= =A0 =C2=A0 [HC]: This draft plus the draft for flooding reduction can provi= de two modes of flooding reductions (i.e., centralized mode and distributed= mode). The latter describes the two modes, but does not include any flooding topology computation algorithm for the distr= ibuted mode. The former proposes a=C2=A0flooding topology computation algorithm to be used in the distributed m= ode.=C2=A0=C2=A0

=C2=A0

=C2=A0 =C2=A0Gyan> It maybe a good idea for= both documents to reference each other as to how they play together or =C2= =A0in some respects if any provide a homogeneous complete holistic solution= for flooding problem being solved. =C2=A0

=C2=A0

It is a good idea to have this new draft ref= erence the dynamic-flooding but not vice-versa. The existing dynamic floodi= ng draft provides a framework for any dynamic flooding algorithm that provi= des a separate flooding topology. This algorithm is just the first to be formally proposed in a draft. Note = that another algorithm was presented during the LSR virtual interim which r= eplaced IETF 107. =C2=A0

=C2=A0

In my opinion it may not be a bad idea even to= combine both drafts so the solution is complete and holistic.=C2=A0 This w= ill also make the overall specification flow nicely. =C2=A0

=C2=A0

No =E2=80=93 we=E2=80=99re not going to do t= his.

=C2=A0

Thanks,

Acee

=C2=A0

I know that efforts were made by LSR to have a= common IGP solution, however there are many inherent differences between I= SIS and OSPF that from IGP Link state protocol perspective you can treat li= ke apples to apples but really it=E2=80=99s apples and oranges.=C2=A0 Maybe it might we wise to have separate draft fo= r both and have references linking together as the same algorithm concept a= nd mathematically however the actual code implementation would vary as the = LSDB link state data structures are completely different.=C2=A0

=C2=A0

Later =3D Dynamic flooding =3D 2 modes Central= ized leader based and distributed=C2=A0

=C2=A0

This later draft per section excerpt provides = both centralized and distributed algorithm see below=C2=A0

=C2=A0

6.4.=C2=A0 Area Leader Responsibilities
=C2=A0
=C2=A0=C2=A0 If the Area Leader operates in central=
ized mode, it MUST advertise<=
u style=3D"font-family:monospace">
=C2=A0=C2=A0 algorithm 0 in its Area Leader Sub-TLV=
.=C2=A0 In order for Dynamic<=
u style=3D"font-family:monospace">
=C2=A0=C2=A0 Flooding to be enabled it also MUST co=
mpute and advertise a flooding
=C2=A0=C2=A0 topology for the area.=C2=A0 The Area =
Leader may update the flooding
=C2=A0=C2=A0 topology at any time, however, it shou=
ld not destabilize the network
=C2=A0=C2=A0 with undue or overly frequent topology=
 changes.=C2=A0 If the Area Leader
=C2=A0=C2=A0 operates in centralized mode and needs=
 to advertise a new flooding<=
u style=3D"font-family:monospace">
=C2=A0=C2=A0 topology, it floods the new flooding t=
opology on both the new and old
=C2=A0=C2=A0 flooding topologies.
=C2=A0
=C2=A0=C2=A0 If the Area Leader operates in distrib=
uted mode, it MUST advertise a
=C2=A0=C2=A0 non-zero algorithm in its Area Leader =
Sub-TLV.
=C2=A0
=C2=A0=C2=A0 When the Area Leader advertises algori=
thm 0 in its Area Leader Sub-=

=C2=A0=C2=A0 TLV and does not advertise a flooding =
topology, Dynamic Flooding is=

=C2=A0=C2=A0 disabled for the area.=C2=A0 Note this=
 applies whether the Area Leader<=
/u>
=C2=A0=C2=A0 intends to operate in centralized mode=
 or in distributed mode.
=C2=A0
=C2=A0=C2=A0 Note that once Dynamic Flooding is ena=
bled, disabling it risks
=C2=A0=C2=A0 destabilizing the network.

=C2=A0


6.5.=C2=A0 Distributed Flooding Topology Calculation


=C2=A0


=C2=A0=C2=A0 If the Area Leader advertises a non-ze=
ro algorithm in its Area Leader


=C2=A0=C2=A0 Sub-TLV, all nodes in the area that su=
pport Dynamic Flooding and the


=C2=A0=C2=A0 value of algorithm advertised by the A=
rea Leader MUST compute the


=C2=A0=C2=A0 flooding topology based on the Area Le=
ader's advertised algorithm.<=
/u>


=C2=A0


=C2=A0=C2=A0 Nodes that do not support the value of=
 algorithm advertised by the<=
u style=3D"font-family:monospace">


=C2=A0=C2=A0 Area Leader MUST continue to use stand=
ard flooding mechanism as


=C2=A0=C2=A0 defined by the protocol.

=C2=A0


=C2=A0=C2=A0 Nodes that do not support the value of=
 algorithm advertised by the<=
u style=3D"font-family:monospace">


=C2=A0=C2=A0 Area Leader MUST be considered as Dyna=
mic Flooding incapable nodes by


=C2=A0=C2=A0 the Area Leader.


=C2=A0


=C2=A0=C2=A0 If the value of the algorithm advertis=
ed by the Area Leader is from=



=C2=A0=C2=A0 the range 128-254 (private distributed=
 algorithms), it is the responsibility of the=C2=A0


network operator to guarante=
e that all nodes in the area have a common understanding of what the given =
algorithm value represents.


=C2=A0

Former =3D WG LC=C2=A0

Provides algorithm for distributed mode for th= is draft as well as the algorithm to be used for distributed mode later dyn= amic flooding draft=C2=A0

=C2=A0

Separate question-

=C2=A0

In light of the flooding algorithm and seeing = that at the bottom of section 6.5 mentions flooding algorithm are the IANA = codepoints reserved for flooding unique and non overlapping with the flex a= lgo codepoints I believe 0-127.=C2=A0 I would think the flooding algorithm range of values is completely separate = since a different function then flex algo values.

=C2=A0

=C2= =A0

Bes= t Regards,

Hua= imo

From: Gyan Mishra <hayabusagsm@gmail.com>
Sent: Thursday, May 21, 2020 10:36 AM


To: Huaimo Chen <huaimo.chen@futurewei.com>
Cc: Acee Lindem (acee) <acee=3D40cisco.com@dmarc.ietf.org>; lsr@ietf.org <lsr@ietf.org>
Subject: Re: [Lsr] Flooding Topology Computation Algorithm - draft-c= c-lsr-flooding-reduction-08 Working Group Adoption Call

=C2=A0

=C2=A0

=C2=A0

On Wed, May 20, 2020 at 11:59 PM Huaimo Chen &= lt;huaimo.ch= en@futurewei.com> wrote:

Hi = Gyan,

=C2= =A0

=C2= =A0 =C2=A0 Thanks much for your questions. My answers are inline below with= [HC].

=C2= =A0

Bes= t Regards,

Hua= imo

From: Gyan Mishra <hayabusagsm@gmail.com>
Sent: Wednesday, May 20, 2020 11:14 AM
To: Huaimo Chen <huaimo.chen@futurewei.com>
Cc: Acee Lindem (acee) <acee=3D40cisco.com@dmarc.ietf.org>; lsr@ietf.org <lsr@ietf.org>
Subject: Re: [Lsr] Flooding Topology Computation Algorithm - draft-c= c-lsr-flooding-reduction-08 Working Group Adoption Call

=C2=A0

Huaimo=C2=A0

=C2=A0

This is a much needed feature that operators h= ave been needing for densely meshed topologies that commonly exist in data = centers to accommodate very high bandwidth E-W traffic.

[HC]: Thank you very much.

=C2=A0

Below is link from Cisco which has introduced = feature for dynamic flooding in clos high density ECMP data center topologi= es.

=C2=A0

Please look at the feature description and it = does seem to be exactly the same as this draft.=C2=A0 Please confirm.=C2=A0=

[HC]: It seems different.=C2=A0<= /p>

=C2=A0

There maybe other vendors due to industry dema= nd have to get the feature deployed before it reaches standards vendor cons= ensus with the IETF.

=C2=A0

=C2=A0

We are testing this feature and planning to de= ploy but wanted to ensure that this is the same as the draft on the standar= ds track.

[HC]: The feature appears implemented draft "Dynamic Flooding on Dense Graph= s", which does not include any flooding topology computation algorithm= ..=C2=A0

=C2=A0

=C2=A0 =C2=A0 Gyan> How does this draft com= pare to the WG LC draft for flood reduction.=C2=A0 Would they be two eventu= al standard options in the operators toolbox =C2=A0or competing features fo= r optimized flood reduction. Would having two flood reduction features standardized versus one default IGP flood reduction feature be co= nfusing for operators.=C2=A0 Just as it was confusing to me.<= /p>

=C2=A0

=C2=A0

Kind regards=C2=A0

=C2=A0

Gyan

=C2=A0

=C2=A0

On Tue, May 19, 2020 at 11:52 PM Huaimo Chen &= lt;huaimo.ch= en@futurewei.com> wrote:

Hi Gyan,

=C2= =A0

=C2=A0 =C2=A0 Thank you very much for your questi= ons and support.

=C2= =A0

=C2=A0 =C2=A0 This Flooding Topology Computation algorithm can be used in the Dynamic Flooding on Dense Graphs to compute the floodin= g topologies for the=C2=A0data center clos dense meshed topologies with man= y ECMP paths. It can be used by the area leader in the centralized mode to = compute the flooding topology. =C2=A0=C2=A0

=C2=A0

Best Regards,

Huaimo

From: Lsr <lsr-bounces@ietf.org> on behalf of Gyan Mishra = <hayabusagsm@= gmail.com>
Sent: Tuesday, May 19, 2020 2:39 AM
To: Yanhe Fan <yfan@casa-systems.com>
Cc: lsr@ietf.org <lsr@ietf.org&g= t;; Acee Lindem (acee) <acee=3D40cisco.com@dmarc.ietf.org>
Subject: Re: [Lsr] Flooding Topology Computation Algorithm - draft-c= c-lsr-flooding-reduction-08 Working Group Adoption Call

=C2=A0

=C2=A0

I support WG adoption and have a few questions= related to the draft.

=C2=A0

Does this flooding algorithm use the dynamic f= looding algorithm used in data center clos dense meshed topologies with man= y ECMP paths where the flood is decoupled from the physical topology.=C2=A0= In the dynamic flooding algorithm mentioned in centralized mode the flooding is computed by the area leader and distri= buted to all nodes.=C2=A0 In distributed mode each mode the area leader det= ermines the algorithm and then each node computes the flooding topology bas= ed on the algorithm. =C2=A0

=C2=A0

This dynamic algorithm for optimized flood red= uction would reduce the amount of redundant flooding in highly densely mesh= ed ospf or Isis topologies.=C2=A0 So this optimization of flooding would im= proving overall link state routing protocol convergence.

=C2=A0

Gyan=C2=A0

=C2=A0

On Mon, May 18, 2020 at 3:37 PM Yanhe Fan <= yfan@casa-system= s.com> wrote:

Support it as a co-author.

=C2=A0

Thanks,

Yanhe

______________________________________________= _
Lsr mailing list
Lsr@ietf.org
https://www= .ietf.org/mailman/listinfo/lsr

--

Error! Filename not specified.

Gyan Mishra

Network Solutions Architect=C2=A0

M 301 502-1347
13101 Columbia Pike=C2=A0
Silver Spring, MD

=C2=A0

--

Error! Filename not specified.

Gyan Mishra

Network Solutions Archit= ect=C2=A0

M 301 502-1347
13101 Columbia Pike=C2=A0
Silver Spring, MD

=C2=A0

--

Gyan Mishra

Network Solutions Archit= ect=C2=A0

M 301 502-1347
13101 Columbia Pike=C2=A0
Silver Spring, MD

=C2=A0

--

Gyan Mishra

Network Solutions Archit= ect=C2=A0

M 301 502-1347
13101 Columbia Pike=C2=A0
Silver Spring, MD

=C2=A0

--

3D"Image

<= span style=3D"font-family:Arial,sans-serif;color:black">Gyan Mishra<= /b>

<= span style=3D"font-family:Georgia,serif;color:black">Network Solutions Arch= itect=C2=A0

<= span style=3D"font-family:Georgia,serif;color:black">M 301 502-1347
13101 Columbia Pike=C2=A0
Silver Spring, MD

<= /a>

=C2=A0

--

=

Gyan M= ishra

Network Solutions Architect=C2=A0

M 301 502-1347

<= /blockquote>
--
<= div dir=3D"ltr" class=3D"gmail_signature" data-smartmail=3D"gmail_signature= ">


Gyan Mishra

Network Solutions Architect=C2=A0

M 301 502-1347
13101 Columbia Pike=C2=A0
Silv= er Spring, MD


<= /div>
--000000000000621fac05a6c0fc17-- From nobody Fri May 29 03:51:09 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 3D9683A0ABD; Fri, 29 May 2020 03:50:58 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -9.601 X-Spam-Level: X-Spam-Status: No, score=-9.601 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIMWL_WL_MED=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, SPF_PASS=-0.001, URIBL_BLOCKED=0.001, USER_IN_DEF_DKIM_WL=-7.5] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=cisco.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id ex6c9nD57YOy; Fri, 29 May 2020 03:50:56 -0700 (PDT) Received: from aer-iport-4.cisco.com (aer-iport-4.cisco.com [173.38.203.54]) (using TLSv1.2 with cipher DHE-RSA-SEED-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id E0C623A0AB9; Fri, 29 May 2020 03:50:55 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=1683; q=dns/txt; s=iport; t=1590749456; x=1591959056; h=subject:to:cc:references:from:message-id:date: mime-version:in-reply-to:content-transfer-encoding; bh=cxvTsfRXUKjXmYmmazI1Pdm0uTSeh3HjkcwQE/Upe1Y=; b=gmaeZocWsnUGW6FWOHfBOHUHJw9xIML6iyQ8OnBxdGoREYi3+Xc0wbaL xk2Wc7/29Ts5I1VvbV0eGNvwBqcQvZNPdbHDLrxWepL1b0I0SoeYTTyKR Ms8d8J37hgeAkf6fk3v61VJp+RKHxf517wDv87DL24xvw7Luz8j3qAZ0B g=; X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: =?us-ascii?q?A0B0AQDB6NBe/xbLJq1mGwEBAQEBAQE?= =?us-ascii?q?BBQEBARIBAQEDAwEBAUCBSoMYVAEgEoRRiQGICZtyCwEBAQ4jDAQBAYREAoI?= =?us-ascii?q?iJTgTAgMBAQsBAQUBAQECAQYEbYVZDIVyAQEBAQIBIxVBEAsUBAICJgICVwY?= =?us-ascii?q?BDAgBAYMiAYJcIA+vCXaBMoVRg2CBOgaBDiqMX4FBP4ERJ4JpPoJnAoE8gz2?= =?us-ascii?q?CYASPDIo1mX6CXoJ6hTaQMwcegmWJBYRljUGQXIlzlCOBaiKBVjMaCBsVgyV?= =?us-ascii?q?PGQ2QTBeIY4VEPwNnAgYIAQEDCYsvgkUBAQ?= X-IronPort-AV: E=Sophos;i="5.73,448,1583193600"; d="scan'208";a="26563866" Received: from aer-iport-nat.cisco.com (HELO aer-core-2.cisco.com) ([173.38.203.22]) by aer-iport-4.cisco.com with ESMTP/TLS/DHE-RSA-SEED-SHA; 29 May 2020 10:50:48 +0000 Received: from [10.60.140.51] (ams-ppsenak-nitro2.cisco.com [10.60.140.51]) by aer-core-2.cisco.com (8.15.2/8.15.2) with ESMTP id 04TAomW1025928; Fri, 29 May 2020 10:50:48 GMT To: Linda Dunbar , gen-art@ietf.org Cc: last-call@ietf.org, lsr@ietf.org, draft-ietf-ospf-te-link-attr-reuse.all@ietf.org References: <159068537978.29606.17882487660677527802@ietfa.amsl.com> From: Peter Psenak Message-ID: Date: Fri, 29 May 2020 12:50:48 +0200 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:60.0) Gecko/20100101 Thunderbird/60.7.0 MIME-Version: 1.0 In-Reply-To: <159068537978.29606.17882487660677527802@ietfa.amsl.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-Outbound-SMTP-Client: 10.60.140.51, ams-ppsenak-nitro2.cisco.com X-Outbound-Node: aer-core-2.cisco.com Archived-At: Subject: Re: [Lsr] Genart last call review of draft-ietf-ospf-te-link-attr-reuse-12 X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 29 May 2020 10:50:58 -0000 Hi Linda, On 28/05/2020 19:02, Linda Dunbar via Datatracker wrote: > Reviewer: Linda Dunbar > Review result: Not Ready > > I am the assigned Gen-ART reviewer for this draft. The General Area > Review Team (Gen-ART) reviews all IETF documents being processed > by the IESG for the IETF Chair. Please treat these comments just > like any other last call comments. > > For more information, please see the FAQ at > > . > > Document: draft-ietf-ospf-te-link-attr-reuse-?? > Reviewer: Linda Dunbar > Review Date: 2020-05-28 > IETF LC End Date: 2020-05-29 > IESG Telechat date: Not scheduled for a telechat > > Summary: this document introduces a new link attribute advertisement in OSPFv2 > and OSPFv3 to address general link properties needed for new applications, such > as Segment Routing. > > Major issues: > The document has good description on the TLV structure of the Application > specific Advertisements, but fails to describe what are the NEW Link attributes > needed by Segment Routing. Page 7 (section 5) has a really good description on > all the link properties added to OSFP (RFC4203, RFC 7308, RFC7471, RFC3630) to > achieve TE. I can see Segment Routing would need each node to advertise its own > SID and the SIDs of adjacent nodes. Can't they be encoded (or extended) in > OSPF's NODE ID? we are not defining any new attributes. We are allowing an existing link attributes to be used by other applications, including, but not limited to SRTE. thanks, Peter > > Minor issues: > > Nits/editorial comments: > > Best regards, > > Linda Dunbar > > > > From nobody Fri May 29 06:10:41 2020 Return-Path: X-Original-To: lsr@ietf.org Delivered-To: lsr@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id EF0673A082F; Fri, 29 May 2020 06:10:34 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: Jouni Korhonen via Datatracker To: Cc: last-call@ietf.org, draft-ietf-isis-te-app.all@ietf.org, lsr@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 7.1.0 Auto-Submitted: auto-generated Precedence: bulk Message-ID: <159075783492.5716.1349202383488874383@ietfa.amsl.com> Reply-To: Jouni Korhonen Date: Fri, 29 May 2020 06:10:34 -0700 Archived-At: Subject: [Lsr] Genart last call review of draft-ietf-isis-te-app-13 X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 29 May 2020 13:10:35 -0000 Reviewer: Jouni Korhonen Review result: Ready with Nits I am the assigned Gen-ART reviewer for this draft. The General Area Review Team (Gen-ART) reviews all IETF documents being processed by the IESG for the IETF Chair. Please treat these comments just like any other last call comments. For more information, please see the FAQ at . Document: draft-ietf-isis-te-app-?? Reviewer: Jouni Korhonen Review Date: 2020-05-29 IETF LC End Date: 2020-05-29 IESG Telechat date: Not scheduled for a telechat Summary: Not really my area of expertise, however, I did not spot any issues during the review. The document is ready for publication. Major issues: None. Minor issues: None. Nits/editorial comments: * There are spacing issues mostly with parenthesis in the text that the RFC editor likely takes care of. * On line 165 SR is used without expanding it. The expansion is obvious but the RFC has both "Segment Routing" and "Shared Risk" used with SRxx.. * At least Section 5 has "is NOT" and "does NOT" emphasis used. I would use just "is not" and "does not", since those with "NOT" are not in listed in normal "Requirements Language". 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X-IronPort-AV: E=Sophos;i="5.73,449,1583193600"; d="scan'208";a="26568618" Received: from aer-iport-nat.cisco.com (HELO aer-core-1.cisco.com) ([173.38.203.22]) by aer-iport-4.cisco.com with ESMTP/TLS/DHE-RSA-SEED-SHA; 29 May 2020 14:59:33 +0000 Received: from [10.60.140.51] (ams-ppsenak-nitro2.cisco.com [10.60.140.51]) by aer-core-1.cisco.com (8.15.2/8.15.2) with ESMTP id 04TExXj9002544; Fri, 29 May 2020 14:59:33 GMT To: Linda Dunbar , "gen-art@ietf.org" Cc: "last-call@ietf.org" , "lsr@ietf.org" , "draft-ietf-ospf-te-link-attr-reuse.all@ietf.org" References: <159068537978.29606.17882487660677527802@ietfa.amsl.com> From: Peter Psenak Message-ID: Date: Fri, 29 May 2020 16:59:33 +0200 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:60.0) Gecko/20100101 Thunderbird/60.7.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit X-Outbound-SMTP-Client: 10.60.140.51, ams-ppsenak-nitro2.cisco.com X-Outbound-Node: aer-core-1.cisco.com Archived-At: Subject: Re: [Lsr] Genart last call review of draft-ietf-ospf-te-link-attr-reuse-12 X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 29 May 2020 14:59:40 -0000 Linda, On 29/05/2020 16:52, Linda Dunbar wrote: > Peter, > You said: > /we are not defining any new attributes./ > /We are allowing an existing link attributes to be used by other > applications, including, but not limited to SRTE./ > What prevent a node (or an application on the node) receiving the LSA > from using the attributes carried by the LSA? the problem with existing advertisement is that RSVP-TE will use it, even if it was not intended to be used by RSVP-TE. We are providing a way to explicitly advertised apps that are allowed to use the advertised attributes. > If no new attributes are > to be added, then why need a new ASLA sub-TLV? to be able to use the existing attributes for new apps, other than RSVP-TE. thanks, Peter > Linda > -----Original Message----- > From: Peter Psenak > Sent: Friday, May 29, 2020 5:51 AM > To: Linda Dunbar ; gen-art@ietf.org > Cc: last-call@ietf.org; lsr@ietf.org; > draft-ietf-ospf-te-link-attr-reuse.all@ietf.org > Subject: Re: Genart last call review of > draft-ietf-ospf-te-link-attr-reuse-12 > Hi Linda, > On 28/05/2020 19:02, Linda Dunbar via Datatracker wrote: >> Reviewer: Linda Dunbar >> Review result: Not Ready >> >> I am the assigned Gen-ART reviewer for this draft. The General Area >> Review Team (Gen-ART) reviews all IETF documents being processed by >> the IESG for the IETF Chair.  Please treat these comments just like >> any other last call comments. >> >> For more information, please see the FAQ at >> >> . >> >> Document: draft-ietf-ospf-te-link-attr-reuse-?? >> Reviewer: Linda Dunbar >> Review Date: 2020-05-28 >> IETF LC End Date: 2020-05-29 >> IESG Telechat date: Not scheduled for a telechat >> >> Summary: this document introduces a new link attribute advertisement >> in OSPFv2 and OSPFv3 to address general link properties needed for new >> applications, such as Segment Routing. >> >> Major issues: >> The document has good description on the TLV structure of the >> Application specific Advertisements, but fails to describe what are >> the NEW Link attributes needed by Segment Routing. Page 7 (section 5) >> has a really good description on all the link properties added to OSFP >> (RFC4203, RFC 7308, RFC7471, RFC3630) to achieve TE. I can see Segment >> Routing would need each node to advertise its own SID and the SIDs of >> adjacent nodes. Can't they be encoded (or extended) in OSPF's NODE ID? > we are not defining any new attributes. > We are allowing an existing link attributes to be used by other > applications, including, but not limited to SRTE. > thanks, > Peter >> >> Minor issues: >> >> Nits/editorial comments: >> >> Best regards, >> >> Linda Dunbar >> >> >> >> From nobody Fri May 29 08:02:44 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 041BA3A0A93; Fri, 29 May 2020 08:02:39 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -9.598 X-Spam-Level: X-Spam-Status: No, score=-9.598 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001, USER_IN_DEF_DKIM_WL=-7.5] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); 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Fri, 29 May 2020 09:18:11 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit From: Daniele Ceccarelli via Datatracker To: Cc: last-call@ietf.org, lsr@ietf.org, draft-ietf-ospf-te-link-attr-reuse.all@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 7.1.0 Auto-Submitted: auto-generated Precedence: bulk Message-ID: <159076909169.565.534138764890157419@ietfa.amsl.com> Reply-To: Daniele Ceccarelli Date: Fri, 29 May 2020 09:18:11 -0700 Archived-At: Subject: [Lsr] Rtgdir last call review of draft-ietf-ospf-te-link-attr-reuse-12 X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 29 May 2020 16:18:12 -0000 Reviewer: Daniele Ceccarelli Review result: Has Nits Hello, I have been selected as the Routing Directorate reviewer for this draft. The Routing Directorate seeks to review all routing or routing-related drafts as they pass through IETF last call and IESG review, and sometimes on special request. The purpose of the review is to provide assistance to the Routing ADs. For more information about the Routing Directorate, please see ​http://trac.tools.ietf.org/area/rtg/trac/wiki/RtgDir Although these comments are primarily for the use of the Routing ADs, it would be helpful if you could consider them along with any other IETF Last Call comments that you receive, and strive to resolve them through discussion or by updating the draft. Document: draft-ietf-ospf-te-link-attr-reuse-12 Reviewer: Daniele Ceccarelli Review Date: 2020-05-29 IETF LC End Date: date-if-known Intended Status: Standard Track Summary: The readibility of the draft has been significantly improved since my last review (v07), mostly the abstract and the introduction, which now cleary state what is the scope of the draft. I also appreciated the introduction of section 3 where a description of the existing solution is described. Minor issues: - Section 4.1 - Advantages with respect to RSVP-TE are described while the text speaks about advantages with respect to RSVP-TE and GMPLS, probably it could be changed into: advantages with respect to RSVP-TE when used in packet networks and in GMPLS, something like this. - Section 5 - Why for the UDABM it doens't say the value MUST be 0,4,8 but rather says "the legal values are" ? Is 8 octets future-proof enough? or conversely, if only 3 values are defined why do we need 8 octects as option? - Section 8 - I really find it hard to understand this small section. Typos: - Unidirectional Link Dela [RFC7471] From nobody Fri May 29 10:17:48 2020 Return-Path: X-Original-To: lsr@ietf.org Delivered-To: lsr@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id 91C033A0E5A; Fri, 29 May 2020 10:17:35 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit From: Bruno Decraene via Datatracker To: Cc: last-call@ietf.org, draft-ietf-isis-te-app.all@ietf.org, lsr@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 7.1.0 Auto-Submitted: auto-generated Precedence: bulk Message-ID: <159077265555.16212.13520780610035572236@ietfa.amsl.com> Reply-To: Bruno Decraene Date: Fri, 29 May 2020 10:17:35 -0700 Archived-At: Subject: [Lsr] Rtgdir last call review of draft-ietf-isis-te-app-13 X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 29 May 2020 17:17:43 -0000 Reviewer: Bruno Decraene Review result: Has Issues Hello, I have been selected as the Routing Directorate reviewer for this draft. The Routing Directorate seeks to review all routing or routing-related drafts as they pass through IETF last call and IESG review, and sometimes on special request. The purpose of the review is to provide assistance to the Routing ADs. For more information about the Routing Directorate, please see ​http://trac.tools.ietf.org/area/rtg/trac/wiki/RtgDir Although these comments are primarily for the use of the Routing ADs, it would be helpful if you could consider them along with any other IETF Last Call comments that you receive, and strive to resolve them through discussion or by updating the draft. Document: draft-ietf-isis-te-app-13 Reviewer: Bruno Decraene Review Date: 2020-05-29 IETF LC End Date: 2020-05-29 Intended Status: Standards Track Summary: I have some minor concerns about this document that I think should be resolved before publication. Comments: Draft is clear. Minor Issues: §4.1 *2 (for SABM & UDABM fields) OLD: The length SHOULD be the minimum required to send all bits which are set. I'd propose NEW: The length SHOULD be the minimum required to send all the meaningful bits which are set. Motivation; the 'bits which are sent' are the bits in the SABM field. (they do include non-meaningful and padding bits) ---- OLD: Undefined bits MUST be transmitted as 0 NEW: Undefined transmitted bits MUST be cleared (0) Motivation: currently the number of undefined bits is 8*8-3. They SHOULD not be transmitted (beyond the first ones fitting in the first N required octet). The sentence "Undefined bits MUST be transmitted as 0" could be read as all defined bits MUST be transmitted (as 0). --- User Defined Application Identifier Bits have no name. I'd propose to call them UDABM[0], UDABM[1]... This may avoid that different implementation use different names and, more problematic, that some implementations starting with 1 (the first, the second) while while some other implementations starts as 0, creating interop issues (SABM[1] on node A is SABM[0] on node B) --- §4.2 "In cases where conflicting values for the same application/attribute/link are advertised all the conflicting values MUST be ignored." I'd propose to add "for this application" (IOW, those values are still applicable for all other applications) --- §6.2 I'd argue that the first part of section 3.2 is a specification of the behavior and hence should be moved to section 4.1, rather than placed in the section "deployment consideration" which eventually will not be read by someone implementing the specification. Especially since the text in section 4.1 implies a different behavior: "Bits that are NOT transmitted MUST be treated as if they are set to 0 on receipt." --- §5 "In the case of SRTE, advertisement of application specific link attributes does NOT indicate enablement of SRTE." What does "enablement of SRTE" means? Do you have a pointer to a document/text? I'm not sure I would keep that paragraph on SR-TE enablement. --- §6.1 "Under the conditions defined above, implementations which support the extensions defined in this document have the choice of using legacy advertisements or application specific advertisements in support of SRTE and/or LFA. This will require implementations to provide controls specifying which type of advertisements are to be sent/ processed on receive for these applications." I think that "have the choice" is not prescriptive enough given the deployment issues described in section 6.3 I'd rather say that implementations MUST support the use of both advertisements (legacy and application specific advertisement) and MUST provide controls specifying which type of advertisements are to be processed on receive for these applications. From nobody Fri May 29 14:29:58 2020 Return-Path: X-Original-To: lsr@ietf.org Delivered-To: lsr@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id 581C13A0EDD; Fri, 29 May 2020 14:29:56 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: IETF Meeting Session Request Tool To: Cc: lsr@ietf.org, chopps@chopps.org, lsr-chairs@ietf.org, aretana.ietf@gmail.com X-Test-IDTracker: no X-IETF-IDTracker: 7.1.0 Auto-Submitted: auto-generated Precedence: bulk Message-ID: <159078779585.29677.11804493448853589347@ietfa.amsl.com> Date: Fri, 29 May 2020 14:29:56 -0700 Archived-At: Subject: [Lsr] lsr - New Meeting Session Request for IETF 108 X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 29 May 2020 21:29:56 -0000 A new meeting session request 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RCVD_IN_DNSWL_BLOCKED=0.001, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 38X7BArdRqPR for ; Sat, 30 May 2020 09:17:59 -0700 (PDT) Received: from huawei.com (lhrrgout.huawei.com [185.176.76.210]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 38C6E3A08A7 for ; Sat, 30 May 2020 09:17:59 -0700 (PDT) Received: from lhreml735-chm.china.huawei.com (unknown [172.18.7.107]) by Forcepoint Email with ESMTP id E850D284D2234F1AFE8B for ; Sat, 30 May 2020 17:17:57 +0100 (IST) Received: from lhreml735-chm.china.huawei.com (10.201.108.86) by lhreml735-chm.china.huawei.com (10.201.108.86) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.1913.5; Sat, 30 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ZjsgZm9udC1zaXplOjEycHQ7IGZvbnQtZmFtaWx5OuWui+S9kzsgZm9udC1zaXplOjEycHQ7IG1h cmdpbi1yaWdodDowY207IG1hcmdpbi1sZWZ0OjBjbSI+DQo8c3BhbiBsYW5nPSJFTi1VUyIgc3R5 bGU9ImZvbnQtc2l6ZToxMS4wcHQiPlRoYW5rcyw8YnI+DQpBY2VlPC9zcGFuPjxzcGFuIGxhbmc9 IkVOLVVTIj48L3NwYW4+PC9wPg0KPC9kaXY+DQo8L2Rpdj4NCjwvZGl2Pg0KPC9kaXY+DQo8L2Rp dj4NCjwvZGl2Pg0KPC9ib2R5Pg0KPC9odG1sPg0K --_000_TY2PR03MB4077B30286EA1AEFC86C16AEE18C0TY2PR03MB4077apcp_-- From nobody Sat May 30 11:38:39 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 57FCA3A0CCD; Sat, 30 May 2020 11:38:29 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.107 X-Spam-Level: X-Spam-Status: No, score=-1.107 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RDNS_NONE=0.793, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=no autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 33XIH-J5wLle; Sat, 30 May 2020 11:38:27 -0700 (PDT) Received: from sobco.sobco.com (unknown [136.248.127.164]) by ietfa.amsl.com (Postfix) with ESMTP id 80D613A0CCA; Sat, 30 May 2020 11:38:27 -0700 (PDT) Received: from localhost (localhost [127.0.0.1]) by sobco.sobco.com (Postfix) with ESMTP id AA280375A508; Sat, 30 May 2020 14:38:26 -0400 (EDT) X-Virus-Scanned: amavisd-new at sobco.com Received: from sobco.sobco.com ([127.0.0.1]) by localhost (sobco.sobco.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 7_CzRYJHNpMD; Sat, 30 May 2020 14:38:21 -0400 (EDT) Received: from golem.sobco.com (golem.sobco.com [136.248.127.162]) by sobco.sobco.com (Postfix) with ESMTPSA id 44C9B375A4E6; Sat, 30 May 2020 14:38:21 -0400 (EDT) Content-Type: text/plain; charset=utf-8 Mime-Version: 1.0 (Mac OS X Mail 13.4 \(3608.80.23.2.2\)) From: "Scott O. Bradner" In-Reply-To: Date: Sat, 30 May 2020 14:38:20 -0400 Cc: ops-dir@ietf.org, draft-ietf-ospf-te-link-attr-reuse.all@ietf.org, last-call@ietf.org, lsr@ietf.org Content-Transfer-Encoding: quoted-printable Message-Id: <2B71E88E-3B42-4490-8EF5-6477F9C87DD9@sobco.com> References: <159059262542.19823.6779966735787003447@ietfa.amsl.com> To: Peter Psenak X-Mailer: Apple Mail (2.3608.80.23.2.2) Archived-At: Subject: Re: [Lsr] [Last-Call] Opsdir last call review of draft-ietf-ospf-te-link-attr-reuse-12 X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 30 May 2020 18:38:30 -0000 thanks for the reply - see in line > On May 28, 2020, at 10:09 AM, Peter Psenak = wrote: >=20 > Hi Scott, >=20 > please see inline (##PP): >=20 > On 27/05/2020 17:17, Scott Bradner via Datatracker wrote: >> Reviewer: Scott Bradner >> Review result: Not Ready >> This is an OPS-DIR review of OSPF Link Traffic Engineering Attribute = Reuse >> (draft-ietf-ospf-te-link-attr-reuse) >> This ID describes application-specific attribute advertisements for = use in OSPF. >> I found this ID hard to read and recommend that it be reviewed for = readability. >> I have a basic question about this proposal =E2=80=93 the ID = describes specific >> advertisements to be used when particular applications want to make = use of >> specific link attributes and says that other applications should not = make of >> the information in the advertisement without saying why such use = would be a >> problem. I can imagine some reasons but it seems to me that it would = be good >> if this document just explained the problem it is trying to solve. >=20 > ##PP >=20 > There are two problems mentioned in the Introduction section: >=20 > 1) Ambiguity in terms of which of the advertisements are to be used by = RSVP-TE and which ones should not be. When RSVP was the only application = using these attributes, advertisement of these attributes meant that = RSVP was enabled on the link. Such link was considered as a part of the = RSVP-TE topology. With other applications using and advertising these = link attributes, this logic can not be used anymore, which created the = mentioned ambiguity. >=20 > 2) Lack of support for application specific values for the link = attribute. >=20 > I thought this was clear, but if it is not, please suggest what else = needs to be said. yes - I saw that but I missed seeing why these are a problem - what = harm can come form specifically the first one? I fully expect there are real problems but I think it would be useful to = say what they are >=20 >> Page 7 =E2=80=93 a =E2=80=9CUser Defined Application Identifier=E2=80=9D= is introduced but never >> described =E2=80=93 what uses it and what is it used for > ##PP > we provide a way for the user to advertise link attributes for the = purpose of something that is not defined as standardized application. = What such application might be is not subject to the specification. can that just be said? >=20 >> Section 11 =E2=80=93 I found this discussion of the relationship = between the existence >> of a particular advertisement and the possible existence of an = application to >> use that advertisement to be quite confusing =E2=80=93 if the = existence of a particular >> advertisement does not indicate that any application is listening why = not just >> say that? >=20 > ##PP > there are applications where the application enablement on the link is = relevant - e.g. RSVP-TE - one need to make sure that RSVP is enabled on = the link before sending a RSVP signaling message over it. >=20 > There are applications, where the enablement of the application on the = link is irrelevant and has nothing to do with the fact that some link = attributes are advertised for the purpose of such application - e.g. = LFA. >=20 > We have provided full flexibility to support both. I think it would help to say that in the ID >=20 >> Section 12.3.3 =E2=80=93 I could not tell if this section is saying = that the >> application specific attribute advertisements could not be used if = there is >> even a single legacy router present of if the presence of such a = router means >> that the application specific attribute advertisements can be used = but the old >> advertisements must also be used=20 >=20 > ##PP > a) as long as there is a single legacy router present, all routers = MUST continue to advertise link attributes using legacy advertisements = to allow the legacy router to function properly. >=20 > b) new advertisements can be used in parallel and they can be used by = the routers that do understand them. >=20 > The text in 12.3.3 says: >=20 > "Send application specific advertisements while continuing to > advertise using legacy (all advertisements are then duplicated)." I found it confusing - can you say what you said here? >=20 >=20 >> Section 14 =E2=80=93 it might help to say how new Sub-TLV types can = be added to the registry >=20 > ##PP > we are not defining a nynew registry, we only use existing ones. These = registries have their own registration procedures. I did not see a clear statement that said that was what you are doing or = a clear pointer to where someone should go if they wanted to add a new = value Scott >=20 > thanks, > Peter >=20 >=20 >=20 >=20 >=20 >=20 > --=20 > last-call mailing list > last-call@ietf.org > https://www.ietf.org/mailman/listinfo/last-call From nobody Sat May 30 14:03:46 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 3D7B03A0A1A; Sat, 30 May 2020 14:03:41 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.899 X-Spam-Level: X-Spam-Status: No, score=-1.899 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id eDJvrIJqekTC; Sat, 30 May 2020 14:03:39 -0700 (PDT) Received: from outgoing.mit.edu (outgoing-auth-1.mit.edu [18.9.28.11]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 79B673A0A27; Sat, 30 May 2020 14:03:39 -0700 (PDT) Received: from kduck.mit.edu ([24.16.140.251]) (authenticated bits=56) (User authenticated as kaduk@ATHENA.MIT.EDU) by outgoing.mit.edu (8.14.7/8.12.4) with ESMTP id 04UL3WbA025359 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Sat, 30 May 2020 17:03:34 -0400 Date: Sat, 30 May 2020 14:03:31 -0700 From: Benjamin Kaduk To: Alvaro Retana Cc: "Acee Lindem (acee)" , Peter Psenak , "draft-ietf-isis-mpls-elc@ietf.org" , The IESG , "lsr-chairs@ietf.org" , "lsr@ietf.org" Message-ID: <20200530210331.GW58497@kduck.mit.edu> References: <158992828112.6026.1646593855480055081@ietfa.amsl.com> <1242ad52-bb48-8526-b65b-d413e0cd9e25@cisco.com> <20200521193856.GJ58497@kduck.mit.edu> <63cbb2b2-e7ec-3077-ab4d-258ce95e6ef7@cisco.com> <88a5c560-cb61-78c2-3733-931ffe529b6b@cisco.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: User-Agent: Mutt/1.12.1 (2019-06-15) Archived-At: Subject: Re: [Lsr] Benjamin Kaduk's Discuss on draft-ietf-isis-mpls-elc-12: (with DISCUSS and COMMENT) X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 30 May 2020 21:03:42 -0000 I think it will work for me as well -- thanks! -Ben On Tue, May 26, 2020 at 08:03:17AM -0700, Alvaro Retana wrote: > Just for the record, I’m ok with the latest text. > > Thanks! > > Alvaro. > > On May 26, 2020 at 10:25:38 AM, Peter Psenak (ppsenak@cisco.com) wrote: > > Hi Acee, > > updated the text based on your comments. > > thanks, > Peter > > > On 26/05/2020 16:07, Acee Lindem (acee) wrote: > > Hi Peter, > > > > This is in response to the previous Email on your suggested text. > > > > On 5/26/20, 4:26 AM, "Peter Psenak" wrote: > > > > Hi Alvaro, > > > > please see inline (##PP) > > > > On 22/05/2020 16:59, Alvaro Retana wrote: > > > On May 21, 2020 at 3:39:03 PM, Benjamin Kaduk wrote: > > > > > > > > > Peter: > > > > > > Hi! > > > > > > > > >> With respect to Alvaro's clarification, your answer for (1) makes > sense; > > >> thanks! I think Alvaro has offered to help work out what (if any) > > >> additional text we might want to be sure that the answer to (2) is > clear in > > >> the document. > > > > > > I think that #1 is where some clarification could be useful. :-) > > > > > > > > > I'm including both ISIS and OSPF suggestions below to consolidate the > > > discussion. > > > > > > > > > ... > > >>> My interpretation of Ben's question is two-fold: > > >>> > > >>> (1) Would ISIS routers normally propagate the information to a > > >>> different level? The ELC is a new prefix attribute flag -- are prefix > > >>> attributes always propagated (unchanged) to other levels? If so, then > > >>> the requirement (MUST) is not needed. My reading of rfc7794 is that > > >>> the propagation is optional... > > >> > > >> depends on the attribute or a bit. Some are propagated some are not. > > >> That's why we are saying this one MUST be preserved. > > > > > > Right. > > > > > > For ISIS I think the current text is in line with the specification of > > > the other bits in rfc7794. No changes are needed. > > > > > > If anything, you may want to change the order of this sentence to > > > address Ben's comment: > > > > > > OLD> > > > When a router propagates a prefix between ISIS levels ([RFC5302], it > > > MUST preserve the ELC signaling for this prefix. > > > > > > NEW> > > > The ELC signaling MUST be preserved when a router propagates a prefix > > > between ISIS levels ([RFC5302]). > > > > > > [Similar for OSPF.] > > > > ##PP > > done. > > > > > > > > > > > > > > > > I think that for OSPF it is not that simple... > > > > > > For OSPFv2: rfc7684 says that the "scope of the OSPFv2 Extended Prefix > > > Opaque LSA depends on the scope of the advertised prefixes", which I > > > assume means that for intra-area prefixes the scope will be > > > area-local...so the ABR wouldn't simply propagate it; it would have to > > > originate a new LSA. > > > > ##PP > > correct. It is always a new LSA that ABR needs to generate. Here it's > > actually two LSAs. > > > > > > > > Suggestion (Add to 3.1)> > > > When an OSPFv2 Area Border Router (ABR) distributes information between > > > connected areas it SHOULD originate an OSPFv2 Extended Prefix Opaque > LSA > > > [RFC7684] including the received ELC setting. If the received > information > > > is included in an LSA with an AS-wide scope, then the new LSA is not > needed. > > > > Here's my suggestion for OSPFv2 ABR related text: > > > > "The ELC signaling MUST be preserved when an OSPF Area Border Router > > (ABR) distributes information between connected areas. To do so, ABR > > MUST originate an OSPFv2 Extended Prefix Opaque LSA [RFC7684] including > > the received ELC setting." > > > > Ok - I change "connected areas" to "areas" and "ABR MUST" to "an ABR > MUST". > > > > Here's my suggested text for OSPFv2 ASBR case: > > > > "When an OSPF Autonomous System Boundary Router (ASBR) redistributes a > > prefix from another instance of OSPF or from some other protocol, it > > SHOULD preserve the ELC signaling for the prefix if it exists. To do so, > > ASBR SHOULD originate Extended Prefix Opaque LSA [RFC7684] including the > > ELC setting of the redistributed prefix. The flooding scope of the > > Extended Prefix Opaque LSA MUST match the flooding scope of the LSA that > > ASBR originates as a result of the redistribution. The exact mechanism > > used to exchange ELC between protocol instances on the ASBR is outside > > of the scope of this document." > > > > Sure - replace "ASBR SHOULD" with "an ASBR SHOULD", "that ASBR" with > "that an ASBR", and "the ASBR is" with "an ASBR is" to be consistent. > > Also, "originate Extended" with "originate an Extended". > > > > > > > > > > > > > > > For OSPFv3: The PrefixOptions are *in* the LSA, but I couldn't find > > > anything in rfc5340 saying that the received values should be copied > > > into the Inter-Area-Prefix-LSA (nor that they should not). > > > > > > Suggestion (Add to 3.2)> > > > When an OSPFv3 Area Border Router (ABR) distributes information between > > > connected areas, the setting of the ELC Flag in the > Inter-Area-Prefix-LSA > > > MUST be the same as the received value. > > > > Here's my suggestion for OSPFv3 ABR and ASBR: > > > > "The ELC signaling MUST be preserved when an OSPFv3 Area Border Router > > (ABR) distributes information between connected areas. The setting of > > the ELC Flag in the Inter-Area-Prefix-LSA [RFC5340] or in the > > Inter-Area-Prefix TLV [RFC8362], generated by ABR, MUST be the same as > > the value the ELC Flag associated with the prefix in the source area." > > > > Same change - replace "connected areas" with "areas" and "by ABR" with > "by an ABR". > > > > "When an OSPFv3 Autonomous System Boundary Router (ASBR) redistributes a > > prefix from another instance of OSPFv3 or from some other protocol, it > > SHOULD preserve the ELC signaling for the prefix if it exists. The > > setting of the ELC Flag in the AS-External-LSA [RFC5340] or in the > > External-Prefix TLV [RFC8362], generated by ASBR, MUST be the same as > > the value the ELC Flag associated with the prefix in the source domain. > > The exact mechanism used to exchange ELC between protocol instances on > > the ASBR is outside of the scope of this document. > > > > Add "NSSA-LSA" as a case. Replace "by ASBR" with "by an ASBR" and "value > the ELC" with "value of the ELC". > > > > Thanks, > > Acee > > > > thanks, > > Peter > > > > > > > > > > > > > > > > > > >>> (2) If the propagation is not automatic, and the L1L2 router doesn't > > >>> support this specification, then what are the drawbacks/failure > > >>> scenarios? IOW, for multi-level operation is it a requirement that > > >>> the L1L2 support this specification? > > >> > > >> drawback are identical to what is mentioned in the Security > > >> Considerations section. > > > > > > I think that text is ok. > > > > > > > > > Thanks! > > > > > > Alvaro. > > > > > > > > > > > > > > From nobody Sun May 31 12:06:55 2020 Return-Path: X-Original-To: lsr@ietf.org Delivered-To: lsr@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id 2275E3A0BCF; Sun, 31 May 2020 12:06:53 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: Benjamin Kaduk via Datatracker To: "The IESG" Cc: draft-ietf-isis-mpls-elc@ietf.org, lsr-chairs@ietf.org, lsr@ietf.org, Acee Lindem , aretana.ietf@gmail.com, acee@cisco.com X-Test-IDTracker: no X-IETF-IDTracker: 7.1.0 Auto-Submitted: auto-generated Precedence: bulk Reply-To: Benjamin Kaduk Message-ID: <159095201271.7000.14822371693036212296@ietfa.amsl.com> Date: Sun, 31 May 2020 12:06:53 -0700 Archived-At: Subject: [Lsr] Benjamin Kaduk's No Objection on draft-ietf-isis-mpls-elc-13: (with COMMENT) X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 31 May 2020 19:06:53 -0000 Benjamin Kaduk has entered the following ballot position for draft-ietf-isis-mpls-elc-13: No Objection When responding, please keep the subject line intact and reply to all email addresses included in the To and CC lines. (Feel free to cut this introductory paragraph, however.) Please refer to https://www.ietf.org/iesg/statement/discuss-criteria.html for more information about IESG DISCUSS and COMMENT positions. The document, along with other ballot positions, can be found here: https://datatracker.ietf.org/doc/draft-ietf-isis-mpls-elc/ ---------------------------------------------------------------------- COMMENT: ---------------------------------------------------------------------- Thank you for educating me, and addressing the minor residual remains of my discuss point that were left after that, as well as my comments. From nobody Sun May 31 12:08:36 2020 Return-Path: X-Original-To: lsr@ietf.org Delivered-To: lsr@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id 7DC993A0C0C; Sun, 31 May 2020 12:08:30 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: Benjamin Kaduk via Datatracker To: "The IESG" Cc: draft-ietf-ospf-mpls-elc@ietf.org, lsr-chairs@ietf.org, lsr@ietf.org, Acee Lindem , aretana.ietf@gmail.com, acee@cisco.com X-Test-IDTracker: no X-IETF-IDTracker: 7.1.0 Auto-Submitted: auto-generated Precedence: bulk Reply-To: Benjamin Kaduk Message-ID: <159095211049.1973.14752551301477425494@ietfa.amsl.com> Date: Sun, 31 May 2020 12:08:30 -0700 Archived-At: Subject: [Lsr] Benjamin Kaduk's No Objection on draft-ietf-ospf-mpls-elc-14: (with COMMENT) X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 31 May 2020 19:08:31 -0000 Benjamin Kaduk has entered the following ballot position for draft-ietf-ospf-mpls-elc-14: No Objection When responding, please keep the subject line intact and reply to all email addresses included in the To and CC lines. (Feel free to cut this introductory paragraph, however.) Please refer to https://www.ietf.org/iesg/statement/discuss-criteria.html for more information about IESG DISCUSS and COMMENT positions. The document, along with other ballot positions, can be found here: https://datatracker.ietf.org/doc/draft-ietf-ospf-mpls-elc/ ---------------------------------------------------------------------- COMMENT: ---------------------------------------------------------------------- Thank you for educating me, and addressing the minor residual remains of my discuss point that were left after that, as well as my comments.

On Fri, May 22, 2020 at 9:02 PM <tony.li@tony.li> wrote:

Hi Gyan,

I think with clos spine leaf the = mesh is much more intensive and problematic with ECMP then a circular topol= ogy nodal mesh that results in duplicate redundant flooding that slows down= convergence.=C2=A0 With spine leaf it=E2=80=99s like an X horizontal width= axis and then depth is spine to leaf links.=C2=A0 With spine leaf as you g= row sideways and the spine expand the redundant ECMP grows and redundant fl= ooding grows exponentially and is much worse then circular nodal mesh. =C2= =A0

One very nice thing about dynami= c flooding is that it computes a flooding topology at the node level.=C2=A0= If the adjacency between A and B is on the flooding topology, then any sin= gle link between them may be used for flooding.=C2=A0 If you have 128 way p= arallel links, this is an immediate 128x improvement in flooding overhead.= =C2=A0 What=E2=80=99s more, A and B do not need to agree on which link they= are using and can use different links, resulting in an asymmetric situatio= n, without any loss of correctness or performance.=C2=A0

=C2=A0 =C2=A0Gyan>. = Agreed.=C2=A0 The dynamic flooding really helps with X way ECMP prevalent i= n high density data center clos multi tier leaf spine parial mesh topologie= s that scale massive bandwidth breadth wise horizontally for E-W flows.

Regards,
To= ny