From nobody Thu Sep 1 10:11:54 2016 Return-Path: X-Original-To: bier@ietf.org Delivered-To: bier@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id 173C812DAD1; Thu, 1 Sep 2016 10:11:47 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: IESG Secretary To: "IETF Announcement List" X-Test-IDTracker: no X-IETF-IDTracker: 6.31.1 Auto-Submitted: auto-generated Precedence: bulk Message-ID: <147274990704.32026.3798277964972103633.idtracker@ietfa.amsl.com> Date: Thu, 01 Sep 2016 10:11:47 -0700 Archived-At: Cc: bier@ietf.org Subject: [Bier] Bit Indexed Explicit Replication (bier) WG Interim Meeting: 2016-09-27 X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.17 List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 01 Sep 2016 17:11:47 -0000 The Bit Indexed Explicit Replication (bier) Working Group will hold a multi-day interim meeting. Session 1: 2016-09-27 10:00 to 17:00 US/Pacific Session 2: 2016-09-28 10:00 to 17:00 US/Pacific Session 3: 2016-09-29 10:00 to 13:00 US/Pacific Meeting Location: Milpitas, CA, US Agenda: Agenda will be distributed on the BIER WG mailing list. Information about remote participation: There will be accommodations for remote participation. The BIER working group asked for volunteers to form a design team focused on identifying and specifying an alternative encapsulation of BIER packets. This design team will be meeting in person: Cisco Systems 115 N McCarthy Blvd Milpitas, CA 95035 The location has capacity for those volunteers who will be meeting in person. There will be accommodations for remote participation as well. The list of Design Team volunteers is as follows: gjshep@gmail.com tonysietf@gmail.com naikumar@cisco.com zzhang@juniper.net pierre.pfister@darou.fr farinacci@gmail.com zhang.zheng@zte.com.cn stig@venaas.com ldeghein@cisco.com wang.cui1@zte.com.cn nranns@cisco.com masivaku@cisco.com andrew.dolganow@nokia.com gregory.mirsky@ericsson.com rashid.sangi@huawei.com jefftant.ietf@gmail.com rajiva@cisco.com okomolaf@brocade.com xuxiaohu@huawei.com ice@cisco.com jefftant.ietf@gmail.com rashid.sangi@huawei.com Thank you, Chairs From SRS0=WJAo=UW=darou.fr=pierre.pfister@bounces.m4x.org Fri Sep 2 00:33:38 2016 Return-Path: X-Original-To: bier@ietfa.amsl.com Delivered-To: bier@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id BBAE012D0DD for ; Fri, 2 Sep 2016 00:33:38 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -4.201 X-Spam-Level: X-Spam-Status: No, score=-4.201 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.001, RCVD_IN_DNSWL_MED=-2.3, SPF_HELO_PASS=-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 aN5UsmnvAtPu for ; Fri, 2 Sep 2016 00:33:36 -0700 (PDT) Received: from mx1.polytechnique.org (mx1.polytechnique.org [129.104.30.34]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id AA2D312D0C6 for ; Fri, 2 Sep 2016 00:33:34 -0700 (PDT) Received: from [10.228.42.60] (unknown [173.38.220.57]) (using TLSv1 with cipher ECDHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by ssl.polytechnique.org (Postfix) with ESMTPSA id A77C456491C; Fri, 2 Sep 2016 09:33:31 +0200 (CEST) Content-Type: text/plain; charset=us-ascii Mime-Version: 1.0 (Mac OS X Mail 9.3 \(3124\)) From: Pierre Pfister In-Reply-To: <147280131368.24750.2582129788572723864.idtracker@ietfa.amsl.com> Date: Fri, 2 Sep 2016 09:33:30 +0200 Content-Transfer-Encoding: quoted-printable Message-Id: <3C470D17-363E-4F7D-B943-19FC52052C67@darou.fr> References: <147280131368.24750.2582129788572723864.idtracker@ietfa.amsl.com> To: bier@ietf.org X-Mailer: Apple Mail (2.3124) X-AV-Checked: ClamAV using ClamSMTP at svoboda.polytechnique.org (Fri Sep 2 09:33:31 2016 +0200 (CEST)) Archived-At: Cc: IJsbrand Wijnands Subject: Re: [Bier] New Version Notification for draft-pfister-bier-over-ipv6-00.txt X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.17 Precedence: list List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 02 Sep 2016 07:35:04 -0000 Hello Bier addicts, Ice and I just published a draft detailing a possible way to do BIER = over IPv6. The purpose of this draft is to be used as input to the BIER interim = meeting and=20 feed discussions regarding the future BIER encap. under discussion. Questions, comments and flames are, as always, very welcome. Cheers, - Pierre >=20 >=20 > A new version of I-D, draft-pfister-bier-over-ipv6-00.txt > has been successfully submitted by Pierre Pfister and posted to the > IETF repository. >=20 > Name: draft-pfister-bier-over-ipv6 > Revision: 00 > Title: An IPv6 based BIER Routing Underlay > Document date: 2016-09-02 > Group: Individual Submission > Pages: 6 > URL: = https://www.ietf.org/internet-drafts/draft-pfister-bier-over-ipv6-00.txt > Status: = https://datatracker.ietf.org/doc/draft-pfister-bier-over-ipv6/ > Htmlized: = https://tools.ietf.org/html/draft-pfister-bier-over-ipv6-00 >=20 >=20 > Abstract: > This document specifies a routing underlay which enables transport = of > IPv6 payloads to multiple IPv6 destinations using the Bit Index > Explicit Replication (BIER). The BIER bits are stored within the > low-order bits of the IPv6 destination address while the high-order > bits are left untouched and used in order to decide whether an IPv6 > packet is a regular IPv6 packet or an IPv6 BIER packet, and if so, = to > identify the BIER set identifier. >=20 >=20 >=20 >=20 > 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. >=20 > The IETF Secretariat >=20 From nobody Mon Sep 12 12:35:39 2016 Return-Path: X-Original-To: bier@ietfa.amsl.com Delivered-To: bier@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id D242312B0DC for ; Mon, 12 Sep 2016 12:35:37 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.922 X-Spam-Level: X-Spam-Status: No, score=-1.922 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001] autolearn=unavailable autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); 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Despite the title and abstract, the draft has nothing to do with the routing underlay. It's about procedures for the BIER layer. Section 4 is about BIER layer functions at the BFIR, and section 5 is about BIER layer functions at other BFRs. The draft says in some places that BIER packets are "regular" IPv6 packets, but it says in other places that they are not "regular" IPv6 packets. "Regular" is never defined, but it should be used consistently. The term "BIER bits" occurs in contexts where it seems to mean "BIER BitString". (The bits representing the SI are also "BIER bits", but don't seem to be included as "BIER bits" in this draft.) The draft says that the high-order 64 ("p+i") bits of the IPv6 destination address field are "left untouched". But it proposes using the high-order 56 ("p") bits to hold a special prefix meaning "BIER", and it proposes using the next 8 ("i") bits to represent the SI. That doesn't seem like leaving the high-order bits untouched. But perhaps "untouched" means "the bits are not modified by the forwarding plane" rather than "the functionality of the bits is not modified". It is worth emphasizing that, unlike other proposed encapsulations, this encapsulation only supports BitStrings of length 64. Well, 128-p-i. I guess one could use a /40 prefix and a single SI to get a BitStringLength of 88 if one doesn't need any more than 88 BFR-ids in the domain. It still seems rather restrictive when compared to the other encapsulations that have been proposed. I don't see how the sub-domain is identified in this encapsulation. The draft says: "It makes use of a typical IP longest match in order to decide whether a packet is a BIER packet or not, which means hardware and software existing solutions may be used for that purpose." But existing/deployed hardware and software solutions cannot do the BIER forwarding! So I don't see what advantage is being claimed here. Or is this just a way of saying "at least we don't use IPv6 extension headers" ;-) The draft seems to suggest that if the payload is an IPv6 packet, one can use BIER to multicast it without encapsulating the payload at all. Rather, all one has to do is overwrite the enduser's destination address with an "address" value that contains the BIER prefix, SI, and 64-bit BitString. Do I understand that correctly? If so, this seems to create a number of issues that are not discussed. Suppose, for example, that the original payload has an IPv6 multicast address in its destination address field. If that is overwritten, then when the packet reaches a BFER, the BFER will have no way of knowing what the original destination address was. But the multicast flow layer needs that information in order to further process the packet! If an enduser's UDP packet is carried as the payload of an IPv6 BIER packet, and the UDP packet has non-zero checksum, then, as the draft says, "the UDP checksum must be recomputed when the BIER bits are changed." So the BIER forwarding plane now has a new function -- it has to look to see what the payload is, and whether the the payload has a checksum that needs to be adjusted. Does that sound like a good idea? The draft says: "It is possible to configure a host with an address which corresponds to a BIER address with a single bit set. From the host perspective, such address is not different from a regular IPv6 address." Well, what will then stop the host from using that address as an IPv6 source address? Packets carrying such an IPv6 source address may get dropped for using a prefix that has not been delegated to the host's subnet. If a host uses a "BIER address" as its source address in a given packet, and the packet doesn't get dropped, the packet may elicit responses that put the BIER address in their destination address fields. This seems like a security issue, as it creates an attack vector that can create 64 responses to a single probe. Hopefully hosts will not treat the BIER prefix as a delegated prefix that they can use to compute their own "privacy addresses"; if any of those computed addresses make it to the source address field of an IPv6 packet, and the packet does not get dropped, chaos could ensue. The draft suggests that the BIER prefix can be treated by BFRs outside a given domain as a routable unicast prefix, presumably leading towards one or more BFRs that serve as border routers for a given BIER domain. (At one point, the draft even says that BIER packets are IPv6 unicast packets, which seems a bit misleading. ;-)) That's interesting, but putting this feature to use requires one to work out quite a few details that are not mentioned. And I don't think it will work for non-BFRs within the BIER domain. To pass BIER packet through non-BFRs within the destination BIER domain, one still needs additional encapsulation. The draft talks about "configuring" a BIER router with the rules needed to interpret a given IPv6 destination address field. Does this mean that IGP/BGP extensions for signaling BFR-ids and other BFR parameters will not be used? Why? Or is it allowable for these parameters to be signaled as well as configured? And if we are going to talk about inter-domain BIER, how is the inter-domain signaling done? It is not clear from the draft whether the value of i (number of bits in the SI field) and the set of BFR-ids is specific to a given prefix, or whether it is the same for all prefixes. (Or for all prefixes corresponding to a given domain. Or perhaps sub-domain?) Section 6 gives the "advantages" of the proposal, but it is not clear what the proposal is being compared to. For instance, one of the advantages is claimed to be that the proposal doesn't use IPv6 extension headers. Is the proposal being compared to another proposal that does use IPv6 extension headers? If so, where is that proposal described? (None of the proposals I've seen so far use IPv6 extension headers.) Another "advantage" is that the proposal "may be used for transporting IP multicast packets, but also for sending IP payloads directly to multiple destinations". Does this "advantage" distinguish it from some other proposal? I'd have thought that any multicast encapsulation can cause any packet to sent to multiple destinations. Of course, maybe the first question is whether we really have a need for an encapsulation that is IPv6-specific. The draft doesn't actually seem to address this question. From SRS0=ExxK=VB=darou.fr=pierre.pfister@bounces.m4x.org Tue Sep 13 01:39:55 2016 Return-Path: X-Original-To: bier@ietfa.amsl.com Delivered-To: bier@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id D084712B213 for ; Tue, 13 Sep 2016 01:39:55 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -4.201 X-Spam-Level: X-Spam-Status: No, score=-4.201 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.001, RCVD_IN_DNSWL_MED=-2.3, SPF_HELO_PASS=-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 CgATwn04F1G5 for ; Tue, 13 Sep 2016 01:39:52 -0700 (PDT) Received: from mx1.polytechnique.org (mx1.polytechnique.org [129.104.30.34]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 46A8212B059 for ; Tue, 13 Sep 2016 01:39:51 -0700 (PDT) Received: from [10.228.42.57] (unknown [173.38.220.49]) (using TLSv1 with cipher ECDHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by ssl.polytechnique.org (Postfix) with ESMTPSA id BDCEC56006C; Tue, 13 Sep 2016 10:39:47 +0200 (CEST) Content-Type: text/plain; charset=utf-8 Mime-Version: 1.0 (Mac OS X Mail 9.3 \(3124\)) From: Pierre Pfister In-Reply-To: Date: Tue, 13 Sep 2016 10:39:46 +0200 Content-Transfer-Encoding: quoted-printable Message-Id: <10B5F14B-8A1B-4DFC-B21E-A314B1605213@darou.fr> References: <147280131368.24750.2582129788572723864.idtracker@ietfa.amsl.com> <3C470D17-363E-4F7D-B943-19FC52052C67@darou.fr> To: Eric C Rosen X-Mailer: Apple Mail (2.3124) X-AV-Checked: ClamAV using ClamSMTP at svoboda.polytechnique.org (Tue Sep 13 10:39:48 2016 +0200 (CEST)) Archived-At: Cc: bier@ietf.org, IJsbrand Wijnands Subject: Re: [Bier] New Version Notification for draft-pfister-bier-over-ipv6-00.txt X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.17 Precedence: list List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 13 Sep 2016 08:45:38 -0000 Hello Eric, Thanks for those comments. You found a few quite interesting ambiguities that I will clarify in the = next iteration. But the good news is that those nits did not led you to not understand = something. See the rest inlined. Cheers, - Pierre > Le 12 sept. 2016 =C3=A0 21:26, Eric C Rosen a = =C3=A9crit : >=20 > Here are some comments and questions on draft-pfister-bier-over-ipv6. >=20 > Despite the title and abstract, the draft has nothing to do with the = routing underlay. It's about procedures for the BIER layer. Section 4 = is about BIER layer functions at the BFIR, and section 5 is about BIER = layer functions at other BFRs. Indeed. This is all about BIER Layer. It will get fixed. >=20 > The draft says in some places that BIER packets are "regular" IPv6 = packets, but it says in other places that they are not "regular" IPv6 = packets. "Regular" is never defined, but it should be used = consistently. The point is to explain that such packets look like IPv6 packets, but = are not to routers that have been configured to perform BIER operations = on the BIER packet (And it knows that by matching the destination = address to one of the BIER prefixes). I will try to find a better wording than 'regular'.=20 >=20 > The term "BIER bits" occurs in contexts where it seems to mean "BIER = BitString". (The bits representing the SI are also "BIER bits", but = don't seem to be included as "BIER bits" in this draft.) I looked at the architecture draft but didn't find any place where SI = value is referred as 'bits'. If your point is that 'BIER bits' is not defined, I can live with it and = change it to "BIER BitString" in the document. For the sake of clarity. >=20 > The draft says that the high-order 64 ("p+i") bits of the IPv6 = destination address field are "left untouched". But it proposes using = the high-order 56 ("p") bits to hold a special prefix meaning "BIER", = and it proposes using the next 8 ("i") bits to represent the SI. That = doesn't seem like leaving the high-order bits untouched. But perhaps = "untouched" means "the bits are not modified by the forwarding plane" = rather than "the functionality of the bits is not modified". They are left 'untouched' as in 'not modified after initialization'. Of = course the bit is touched by the sender of the packet. But if you find = it unclear, I will also try to clarify. >=20 > It is worth emphasizing that, unlike other proposed encapsulations, = this encapsulation only supports BitStrings of length 64. Well, = 128-p-i. I guess one could use a /40 prefix and a single SI to get a = BitStringLength of 88 if one doesn't need any more than 88 BFR-ids in = the domain. It still seems rather restrictive when compared to the = other encapsulations that have been proposed. IMHO, what really matters is the ratio of packets sent over the number = of reached destinations. =46rom that regard, a case with 1024 long = BitString and 1M destinations with random access will not be very = efficient. In some cases, 64 destinations are far enough. As you noted, = we already have an encapsulation which can handle longer BitString, so I = guess we'll have to evaluate whether other use cases, 1., need more = bits, 2., can use the existing MPLS encap. >=20 > I don't see how the sub-domain is identified in this encapsulation. It is not addressed by the document indeed. Just for the sake of making = a short document. I guess we could use the IPv6 prefix for that as well. >=20 > The draft says: "It makes use of a typical IP longest match in order = to decide whether a packet is a BIER packet or not, which means hardware = and software existing solutions may be used for that purpose." But = existing/deployed hardware and software solutions cannot do the BIER = forwarding! So I don't see what advantage is being claimed here. Or is = this just a way of saying "at least we don't use IPv6 extension headers" = ;-) It is a way to say "Hey, you will be able to reuse bits of hardware and = code rather than restart everything from scratch". But you have a point. I could add "it doesn't use an IPv6 extension = header" too. >=20 > The draft seems to suggest that if the payload is an IPv6 packet, one = can use BIER to multicast it without encapsulating the payload at all. = Rather, all one has to do is overwrite the enduser's destination address = with an "address" value that contains the BIER prefix, SI, and 64-bit = BitString. Do I understand that correctly? If so, this seems to create = a number of issues that are not discussed. >=20 > Suppose, for example, that the original payload has an IPv6 multicast = address in its destination address field. If that is overwritten, then = when the packet reaches a BFER, the BFER will have no way of knowing = what the original destination address was. But the multicast flow layer = needs that information in order to further process the packet! >=20 I do not suggest to overwrite the destination address sent by the = source. If you don't want to restore it later, it is possible. But this = is obviously a bad idea if you need to restore it. I was rather saying that the source can directly originate a packet = which destination is a BIER IPv6 address. Or if the source sends an IPv6 multicast packets that you need to be = sent through the BIER domain, you can encapsulate it inside the IPv6 = BIER packet.=20 > If an enduser's UDP packet is carried as the payload of an IPv6 BIER = packet, and the UDP packet has non-zero checksum, then, as the draft = says, "the UDP checksum must be recomputed when the BIER bits are = changed." So the BIER forwarding plane now has a new function -- it has = to look to see what the payload is, and whether the the payload has a = checksum that needs to be adjusted. Does that sound like a good idea? I see at least two possibilities here: - Update checksum at every BitString change. This is actually not so = expensive given that the IP checksum is linear (i.e. support updates). = Obviously this requires looking at layer 4. - Have a convention that the packet is checksumed with BitString set to = all-zeroes. >=20 > The draft says: "It is possible to configure a host with an address = which corresponds to a BIER address with a single bit set. =46rom the = host perspective, such address is not different from a regular IPv6 = address." Well, what will then stop the host from using that address as = an IPv6 source address? It is a feature, not a bug. A BIER IPv6 address with a single bit set is = a valid unicast address. >=20 > Packets carrying such an IPv6 source address may get dropped for using = a prefix that has not been delegated to the host's subnet. >=20 > If a host uses a "BIER address" as its source address in a given = packet, and the packet doesn't get dropped, the packet may elicit = responses that put the BIER address in their destination address fields. = This seems like a security issue, as it creates an attack vector that = can create 64 responses to a single probe. Are you talking about BCP38 ? Ingress filtering means that a host cannot = send a packet with any source address. Of course, if the host is = assigned a BIER address, adjacent routers will have to be configured to = not drop the packets that are originated with this source address. It = doesn't mean that you allow the host to use any BIER address though. The = first-hop router (or any other routers) can be configured to do a source = address filtering (just like BCP 38) to make sure that the source = address is not a BIER address with more than one bit set. >=20 > Hopefully hosts will not treat the BIER prefix as a delegated prefix = that they can use to compute their own "privacy addresses"; if any of = those computed addresses make it to the source address field of an IPv6 = packet, and the packet does not get dropped, chaos could ensue. Why would you advertise an IPv6 BIER prefix with the M bit set to 0 = (enabling SLAAC) in your RAs ?! I mean, there is no way SLAAC could be = used for that purpose. You would use DHCPv6 (or some other equivalent) = for address configuration anyway. >=20 > The draft suggests that the BIER prefix can be treated by BFRs outside = a given domain as a routable unicast prefix, presumably leading towards = one or more BFRs that serve as border routers for a given BIER domain. = (At one point, the draft even says that BIER packets are IPv6 unicast = packets, which seems a bit misleading. ;-)) That's interesting, but = putting this feature to use requires one to work out quite a few details = that are not mentioned. And I don't think it will work for non-BFRs = within the BIER domain. To pass BIER packet through non-BFRs within the = destination BIER domain, one still needs additional encapsulation. The document does not claim that you can have non-BFR routers within the = BIER domain. It just claims that you can use regular unicast forwarding = between the source and the BFIR. What sort of details do you think are not mentioned ? It seems to me = that a BIER packet could be very-well routed as unicast based on the = destination BIER prefix up to the BIER domain. >=20 > The draft talks about "configuring" a BIER router with the rules = needed to interpret a given IPv6 destination address field. Does this = mean that IGP/BGP extensions for signaling BFR-ids and other BFR = parameters will not be used? Why? Or is it allowable for these = parameters to be signaled as well as configured? And if we are going to = talk about inter-domain BIER, how is the inter-domain signaling done? You can ! You can ! :-) "Configured" means, "as far as the BIER Layer is concerned", whether = this comes from an educated system administrator, a running process, or = a monkey, I couldn't care less. I will clarify in the next iteration. >=20 > It is not clear from the draft whether the value of i (number of bits = in the SI field) and the set of BFR-ids is specific to a given prefix, = or whether it is the same for all prefixes. (Or for all prefixes = corresponding to a given domain. Or perhaps sub-domain?) Well. This clearly is the kind of things that can be discussed, right ? When I first thought about this approach, I made an experimental = implementation for Linux. I ended up not caring about these. I didn't = even implemented the concept of S.I., but rather decided that every BIER = prefix would use a different 'bit index to next-hop' mapping table. So, = I would say that the set of BRF-ids is specific to a given prefix. I = would even say we can remove the concept of domain and S.I. But that is = the sort of things that I would need BIER experts to discuss with. >=20 > Section 6 gives the "advantages" of the proposal, but it is not clear = what the proposal is being compared to. For instance, one of the = advantages is claimed to be that the proposal doesn't use IPv6 extension = headers. Is the proposal being compared to another proposal that does = use IPv6 extension headers? If so, where is that proposal described? = (None of the proposals I've seen so far use IPv6 extension headers.) Okay. What encap should I compare it to ? >=20 > Another "advantage" is that the proposal "may be used for transporting = IP multicast packets, but also for sending IP payloads directly to = multiple destinations". Does this "advantage" distinguish it from some = other proposal? I'd have thought that any multicast encapsulation can = cause any packet to sent to multiple destinations. Only if the destination implements BIER. In this proposal, the = destination does not need to decap anything. It directly receives a = unicast packet. >=20 > Of course, maybe the first question is whether we really have a need = for an encapsulation that is IPv6-specific. The draft doesn't actually = seem to address this question. >=20 Do you think we shouldn't have another encap. ? Or are you saying we should have a different encap ? From nobody Tue Sep 13 03:00:20 2016 Return-Path: X-Original-To: bier@ietfa.amsl.com Delivered-To: bier@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 993EA12B2BC for ; Tue, 13 Sep 2016 03:00:18 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -5.728 X-Spam-Level: X-Spam-Status: No, score=-5.728 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, RP_MATCHES_RCVD=-1.508, 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 M-YzbARh-HyF for ; Tue, 13 Sep 2016 03:00:16 -0700 (PDT) Received: from lhrrgout.huawei.com (lhrrgout.huawei.com [194.213.3.17]) (using TLSv1 with cipher RC4-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id CD57D12B2B8 for ; Tue, 13 Sep 2016 03:00:15 -0700 (PDT) Received: from 172.18.7.190 (EHLO lhreml703-cah.china.huawei.com) ([172.18.7.190]) by lhrrg01-dlp.huawei.com (MOS 4.3.7-GA FastPath queued) with ESMTP id CWC94068; Tue, 13 Sep 2016 10:00:13 +0000 (GMT) Received: from NKGEML412-HUB.china.huawei.com (10.98.56.73) by lhreml703-cah.china.huawei.com (10.201.5.104) with Microsoft SMTP Server (TLS) id 14.3.235.1; Tue, 13 Sep 2016 10:59:24 +0100 Received: from NKGEML515-MBX.china.huawei.com ([fe80::a54a:89d2:c471:ff]) by nkgeml412-hub.china.huawei.com ([10.98.56.73]) with mapi id 14.03.0235.001; Tue, 13 Sep 2016 17:58:54 +0800 From: Xuxiaohu To: "bier@ietf.org" Thread-Topic: About the range of the SI value Thread-Index: AdINpW/0r1u+VFTpTxiVxFytF9Rrug== Date: Tue, 13 Sep 2016 09:58:54 +0000 Message-ID: <1FEE3F8F5CCDE64C9A8E8F4AD27C19EE2BB18ADA@NKGEML515-MBX.china.huawei.com> Accept-Language: zh-CN, en-US Content-Language: zh-CN X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.111.184.181] Content-Type: multipart/alternative; boundary="_000_1FEE3F8F5CCDE64C9A8E8F4AD27C19EE2BB18ADANKGEML515MBXchi_" MIME-Version: 1.0 X-CFilter-Loop: Reflected X-Mirapoint-Virus-RAPID-Raw: score=unknown(0), refid=str=0001.0A020203.57D7CE2D.01EE, ss=1, re=0.000, recu=0.000, reip=0.000, cl=1, cld=1, fgs=0, ip=0.0.0.0, so=2013-06-18 04:22:30, dmn=2013-03-21 17:37:32 X-Mirapoint-Loop-Id: 705fbcaf32d9d2f8fd5feeebccf46e69 Archived-At: Subject: [Bier] About the range of the SI value X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.17 Precedence: list List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 13 Sep 2016 10:00:19 -0000 --_000_1FEE3F8F5CCDE64C9A8E8F4AD27C19EE2BB18ADANKGEML515MBXchi_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hi all, It said in section 2 of the BEIR architecture draft (https://tools.ietf.org= /html/draft-ietf-bier-architecture-04#page-6) that "A "BFR Identifier" (BFR= -id) is a number in the range [1,65535]. " It said in section 3 of the BEIR architecture draft that "SI is the integer= part of the quotient (N-1)/BitStringLength" It said in section 3 that "A BFR MUST support SI values in the range [0,15]= , and MAY support SI values in the range [0,255]." Assume the BitStringLeng= th is allowed to be 64, the SI value should be in the range [0, 1023] inste= ad of [0,255]. No? Best regards, Xiaohu --_000_1FEE3F8F5CCDE64C9A8E8F4AD27C19EE2BB18ADANKGEML515MBXchi_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Hi all,

 

It said in section 2 of the BEIR a= rchitecture draft (https://tools.ietf.org/html/draft-ietf-bier-architecture= -04#page-6) that “A "BFR Identifier" (BFR-id) is a number i= n the range [1,65535]. ”

 

It said in section 3 of the BEIR a= rchitecture draft that “SI is the integer part of the quotient (N-1)/= BitStringLength”

 

It said in section 3 that “A= BFR MUST support SI values in the range [0,15], and MAY support SI values = in the range [0,255].” Assume the BitStringLength is allowed to be 64= , the SI value should be in the range [0, 1023] instead of [0,255]. No?

 

Best regards,

Xiaohu

--_000_1FEE3F8F5CCDE64C9A8E8F4AD27C19EE2BB18ADANKGEML515MBXchi_-- From nobody Tue Sep 13 07:32:35 2016 Return-Path: X-Original-To: bier@ietfa.amsl.com Delivered-To: bier@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 3A0F812B614; Tue, 13 Sep 2016 07:32:34 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.699 X-Spam-Level: X-Spam-Status: No, score=-2.699 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-0.7, SPF_PASS=-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 wjhCF6H79JLc; Tue, 13 Sep 2016 07:32:27 -0700 (PDT) Received: from mail-qk0-x22f.google.com (mail-qk0-x22f.google.com [IPv6:2607:f8b0:400d:c09::22f]) (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 6953712B4E6; Tue, 13 Sep 2016 06:53:24 -0700 (PDT) Received: by mail-qk0-x22f.google.com with SMTP id t7so72596222qkh.2; Tue, 13 Sep 2016 06:53:24 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:reply-to:from:date:message-id:subject:to; bh=Aa0rCJdwSWVIGyoIKjRbrvUATimec6lf79zeTp+NEd0=; b=OtneKfeJf7DZblwQGy9U7oplZlQWwt98NViiJIqWQM4NlS0v+00hbnUwXr0y3nfEJX n66XY4aPDoHG9v6HEOOcbg9qFlx1GZKfYuacqegacwaJ3yjkPti3GfDTMw2/SimVzcwG foKWwws3ltpveBkd1pu8yTne+rmgY60x74blb+eWgYwcB6ubZzEFWTa0MC3DwYET8ibH k0SjwkQ6KlZ0EDZ4BzzOYjai1KuhrR/dBudcF4a/qL3MTpgUZb51GvJ54Wm+7qBJBSwN e7WjEznIgiVYeB6x1gUTqRTXsJR3+UV6KbgA7zfNi/CbOFa2l0XDQdTdNGVKYUO98fQ3 N0UQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:reply-to:from:date:message-id :subject:to; bh=Aa0rCJdwSWVIGyoIKjRbrvUATimec6lf79zeTp+NEd0=; b=U0EBdJgTV0nxsG6VRk/NLk/jHcQNtWPr9uPAi2y+lyiAwaQogJVo0AGLH0CLAwk6Ye +Hd9/WARKIYVkULceb0Ljr5te+OWcHEaM+rcmtEWXM3HTVRq/jp/FA+yiDJS5XN8DYDw fxAAbDEGr12DJtiXDAovsYNeHHy0p+pHIl/xjKDvhlKjiqS6Egp9QGAfU81zuCiJE1Fg O9yrljNkL+0UEOu03TPr7FanHJcJUHscHMFmiOFZf1tDezSZN2V10oZWLQ2RxHi1Okts YdMLIyOb8NIQ4R0mBOHnLoiI/i454fx8Ri1sMgdEMpAKmKm/5LFUH80C087K/cx+qJyv WGrQ== X-Gm-Message-State: AE9vXwOCzbvpF/lW5SNBPIti3FnzhhhCATWP+KZTRn4R1ElKpSB+wj1PJC//oz2gz9lgIDYFJJXzn/GAApH1JA== X-Received: by 10.55.107.193 with SMTP id g184mr1106760qkc.145.1473774803394; Tue, 13 Sep 2016 06:53:23 -0700 (PDT) MIME-Version: 1.0 Received: by 10.237.60.54 with HTTP; Tue, 13 Sep 2016 06:53:22 -0700 (PDT) From: Greg Shepherd Date: Tue, 13 Sep 2016 06:53:22 -0700 Message-ID: To: IESG Secretary , "bier@ietf.org" Content-Type: multipart/alternative; boundary=001a114fe61aa2a5cc053c63ef92 Archived-At: Subject: [Bier] Agenda: Bit Indexed Explicit Replication (bier) WG Interim Meeting: 2016-09-27 X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.17 Precedence: list Reply-To: gjshep@gmail.com List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 13 Sep 2016 14:32:34 -0000 --001a114fe61aa2a5cc053c63ef92 Content-Type: text/plain; charset=UTF-8 Agenda: Session 1: 2016-09-27 1000-1200 US/Pacific Identify existing use cases covered by MPLS encap Identify use cases not covered by MPLS encap Define operational considerations vs use cases (mod charter?) 1400-1700 US/Pacific draft-cu-bier-encapsulation draft-wang-bier-vxlan-use-cases draft-pfister-bier-over-ipv6 Discuss applicability of drafts to use-cases gaps / ops considerations Encap vs Encode discussion Dinner 1900- Location TBD Session 2: 2016-09-28 1000-1200 US/Pacific Review yesterdays gap discussion discuss path forward for WG 1400-1700 US/Pacific Select path for WG encap, encode, charter? Session 3: 2016-09-29 1000-1300 US/Pacific Request/select team to author work (draft, charter, etc) Define work Set milestones Adjourn On Thu, Sep 1, 2016 at 10:11 AM, IESG Secretary wrote: > The Bit Indexed Explicit Replication (bier) Working Group will hold > a multi-day interim meeting. > > Session 1: > 2016-09-27 10:00 to 17:00 US/Pacific > Session 2: > 2016-09-28 10:00 to 17:00 US/Pacific > Session 3: > 2016-09-29 10:00 to 13:00 US/Pacific > > Meeting Location: > Milpitas, CA, US > > Agenda: > Agenda will be distributed on the BIER WG mailing list. > > Information about remote participation: > There will be accommodations for remote participation. > > The BIER working group asked for volunteers to form a design team focused > on identifying and specifying an alternative encapsulation of BIER packets. > > This design team will be meeting in person: > > Cisco Systems > 115 N McCarthy Blvd > Milpitas, CA 95035 > > The location has capacity for those volunteers who will be meeting in > person. There will be accommodations for remote participation as well. > > The list of Design Team volunteers is as follows: > gjshep@gmail.com > tonysietf@gmail.com > naikumar@cisco.com > zzhang@juniper.net > pierre.pfister@darou.fr > farinacci@gmail.com > zhang.zheng@zte.com.cn > stig@venaas.com > ldeghein@cisco.com > wang.cui1@zte.com.cn > nranns@cisco.com > masivaku@cisco.com > andrew.dolganow@nokia.com > gregory.mirsky@ericsson.com > rashid.sangi@huawei.com > jefftant.ietf@gmail.com > rajiva@cisco.com > okomolaf@brocade.com > xuxiaohu@huawei.com > ice@cisco.com > jefftant.ietf@gmail.com > rashid.sangi@huawei.com > > Thank you, > > Chairs > > _______________________________________________ > BIER mailing list > BIER@ietf.org > https://www.ietf.org/mailman/listinfo/bier > --001a114fe61aa2a5cc053c63ef92 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
Agenda:=

Session 1:
2016-09-27
1000-1200 US/Pacific
Identify existing= use cases covered by MPLS encap
Identify use cases not covered by MPLS encap
Define operational consid= erations vs use cases (mod charter?)

1400-1700 US/Pacific
draft-cu-bier-encapsulation
draft-wang-bier-vxlan-use-cases
<=
span style=3D"font-family:arial,helvetica,sans-serif">draft-pfister-bier-ov=
er-ipv6
Discuss applicability=
 of drafts to use-cases gaps / ops considerations
Encap vs Encode discussion
= 

Dinner 1900-
Location TBD

Session 2:
2016-09-28
1000-1200 US/Pacific
Review yesterdays gap discussion
discuss path forward f= or WG

1400-1700 US/Paci= fic
Select pat= h for WG
=C2= =A0 =C2=A0 =C2=A0encap, encode, charter?

Session 3:
2016-09-29
1000-1300=C2=A0US/Pacific
Request/select team to author= work (draft, charter, etc)
Define work
Set milestones
Adjourn=C2=A0

On Thu, Sep 1, 2016 at 10:11 AM, IESG Secretary <iesg-secretary@ietf.org> wrote:
The Bit Indexed Explicit Replication (bier) Working Group will hold=
a multi-day interim meeting.

Session 1:
2016-09-27=C2=A0 =C2=A0 =C2=A010:00 to 17:00=C2=A0 US/Pacific
Session 2:
2016-09-28=C2=A0 =C2=A0 =C2=A010:00 to 17:00=C2=A0 US/Pacific
Session 3:
2016-09-29=C2=A0 =C2=A0 =C2=A010:00 to 13:00=C2=A0 US/Pacific

Meeting Location:
Milpitas, CA, US

Agenda:
Agenda will be distributed on the BIER WG mailing list.

Information about remote participation:
There will be accommodations for remote participation.

The BIER working group asked for volunteers to form a design team focused on identifying and specifying an alternative encapsulation of BIER packets.=

This design team will be meeting in person:

Cisco Systems
115 N McCarthy Blvd
Milpitas, CA 95035

The location has capacity for those volunteers who will be meeting in
person. There will be accommodations for remote participation as well.

The list of Design Team volunteers is as follows:
gjshep@gmail.com
tonysietf@gmail.com
naikumar@cisco.com
zzhang@juniper.net
pierre.pfister@darou.fr
farinacci@gmail.com
zhang.zheng@zte.com.cn
stig@venaas.com
ldeghein@cisco.com
wang.cui1@zte.com.cn
nranns@cisco.com
masivaku@cisco.com
andrew.dolganow@nokia.com<= br> gregory.mirsky@ericsson.com<= /a>
rashid.sangi@huawei.com
jefftant.ietf@gmail.com
rajiva@cisco.com
okomolaf@brocade.com
xuxiaohu@huawei.com
ice@cisco.com
jefftant.ietf@gmail.com
rashid.sangi@huawei.com

Thank you,

Chairs

_______________________________________________
BIER mailing list
BIER@ietf.org
https://www.ietf.org/mailman/listinfo/bier

--001a114fe61aa2a5cc053c63ef92-- From nobody Wed Sep 14 06:27:15 2016 Return-Path: X-Original-To: bier@ietf.org Delivered-To: bier@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id 7A84212B8E9; Wed, 14 Sep 2016 06:27:12 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: internet-drafts@ietf.org To: X-Test-IDTracker: no X-IETF-IDTracker: 6.33.0 Auto-Submitted: auto-generated Precedence: bulk Message-ID: <147385963249.1704.7029466845740678155.idtracker@ietfa.amsl.com> Date: Wed, 14 Sep 2016 06:27:12 -0700 Archived-At: Cc: bier@ietf.org Subject: [Bier] I-D Action: draft-ietf-bier-ospf-bier-extensions-03.txt X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.17 List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 14 Sep 2016 13:27:12 -0000 A New Internet-Draft is available from the on-line Internet-Drafts directories. This draft is a work item of the Bit Indexed Explicit Replication of the IETF. Title : OSPF Extensions for BIER Authors : Peter Psenak Nagendra Kumar IJsbrand Wijnands Andrew Dolganow Tony Przygienda Jeffrey Zhang Sam Aldrin Filename : draft-ietf-bier-ospf-bier-extensions-03.txt Pages : 9 Date : 2016-09-14 Abstract: Bit Index Explicit Replication (BIER) is an architecture that provides multicast forwarding through a "BIER domain" without requiring intermediate routers to maintain multicast related per-flow state. Neither does BIER require an explicit tree-building protocol for its operation. A multicast data packet enters a BIER domain at a "Bit-Forwarding Ingress Router" (BFIR), and leaves the BIER domain at one or more "Bit-Forwarding Egress Routers" (BFERs). The BFIR router adds a BIER header to the packet. Such header contains a bit-string in which each bit represents exactly one BFER to forward the packet to. The set of BFERs to which the multicast packet needs to be forwarded is expressed by the according set of bits switched on in BIER packet header. This document describes the OSPF protocol extension required for BIER with MPLS encapsulation. The IETF datatracker status page for this draft is: https://datatracker.ietf.org/doc/draft-ietf-bier-ospf-bier-extensions/ There's also a htmlized version available at: https://tools.ietf.org/html/draft-ietf-bier-ospf-bier-extensions-03 A diff from the previous version is available at: https://www.ietf.org/rfcdiff?url2=draft-ietf-bier-ospf-bier-extensions-03 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 Sep 15 09:16:03 2016 Return-Path: X-Original-To: bier@ietfa.amsl.com Delivered-To: bier@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id D125412BC1D for ; Thu, 15 Sep 2016 09:16:01 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.903 X-Spam-Level: X-Spam-Status: No, score=-1.903 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=junipernetworks.onmicrosoft.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 bs0cgE1P3Wq6 for ; Thu, 15 Sep 2016 09:15:57 -0700 (PDT) Received: from NAM03-BY2-obe.outbound.protection.outlook.com (mail-by2nam03on0136.outbound.protection.outlook.com [104.47.42.136]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 17FC712BE9E for ; 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SN1PR05MB2192; 6:hDMbkzW+ni2MRr6UgNgnTaOSMdR0yfDt+k8sowwFSFCZMg8Xwqb2BN7nZuIpCDABqmO73GNyFb5aW02GPE38Xp1SVbrtPJnRQia1JdkYvJX4y0VGY/9de3FQss/OqeWAaTZog+3a8lJydByTxMDDF4yTVTGV79qJGu6UwSitt4XxWnilLVkG47EgelQJ/v1KRj4qHMl5nGNN1lGaGlQ0QsFWpkEZfCUuMJLRal4aN+TULewEAUbU/BuUACI0U1KCqsdDvgmteWeElfLD+72JbapK2RsKgEaE3+RlByVcvEwZKDQ3fH40Z2mADwNu44b9W584XqIPnleKMluFUT+kLw==; 5:8CdTBfvxOG5i9xw9EBmu0HcSHiGtCIx7UeP1rKyrUy0wM3lC7Js9m6YK92+q6tQzZniouZoJoKcDAwUVMioGzNbDjQsNU29uaWywSEM0UL8mGSACtuBt9IpJZ6jnvh0Pm7BvatclfoxOxt1eBbS0NQ==; 24:9oJDEwqxYQ8We58b3mcTH6jmVtiyomG3mDFOOjEV8GqhwpEy0vEg5x7+7KLBZx1SsXbqeUzMaDUEzb2dXkVGSR0k/F9NEBJc1S6W4d2yfpY=; 7:FdXW8G37xLOMgT0U3QqiYP/NbFPUGfENj4KCdhJqd/mITA0bpzRKMZtXSGLhjBS2jBmpd6fdt5y66Ya/VG2U0IKUet22DFhMZ41Fgvju7j6CkPAvWWmz0DLX52yCQvLjDo0W49ZzFjQvfrpOAnE/9GTlORm5YSgQQ4vWGy9Eosz6BqvIMZiGYTr6DZEZVQJUgfoSCMKykpiGyZ8R+Yd16kqj6YUSDNO++uTrPtWFTCkhjs7znquQStBXS+irkt5L SpamDiagnosticOutput: 1:99 SpamDiagnosticMetadata: NSPM X-OriginatorOrg: juniper.net X-MS-Exchange-CrossTenant-OriginalArrivalTime: 15 Sep 2016 15:16:35.8899 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-Transport-CrossTenantHeadersStamped: SN1PR05MB2192 Archived-At: Cc: bier@ietf.org, IJsbrand Wijnands Subject: Re: [Bier] New Version Notification for draft-pfister-bier-over-ipv6-00.txt X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.17 Precedence: list List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 15 Sep 2016 16:16:02 -0000 >> It is worth emphasizing that, unlike other proposed encapsulations, this encapsulation only supports BitStrings of length 64. Well, 128-p-i. I guess one could use a /40 prefix and a single SI to get a BitStringLength of 88 if one doesn't need any more than 88 BFR-ids in the domain. It still seems rather restrictive when compared to the other encapsulations that have been proposed. > IMHO, what really matters is the ratio of packets sent over the number of reached destinations. From that regard, a case with 1024 long BitString and 1M destinations with random access will not be very efficient. In some cases, 64 destinations are far enough. As you noted, we already have an encapsulation which can handle longer BitString, so I guess we'll have to evaluate whether other use cases, 1., need more bits, 2., can use the existing MPLS encap. You should point out then that your encapsulation does not support the full functionality of the BIER architecture as specified by the WG, but only an arbitrarily chosen subset of it. >> I don't see how the sub-domain is identified in this encapsulation. > It is not addressed by the document indeed. Just for the sake of making a short document. > This is another way in which your proposal fails to support the BIER architecture. >> The draft says: "It makes use of a typical IP longest match in order to decide whether a packet is a BIER packet or not, which means hardware and software existing solutions may be used for that purpose." But existing/deployed hardware and software solutions cannot do the BIER forwarding! So I don't see what advantage is being claimed here. Or is this just a way of saying "at least we don't use IPv6 extension headers" ;-) > It is a way to say "Hey, you will be able to reuse bits of hardware and code rather than restart everything from scratch". I don't think there is any proposed encapsulation whose implementation cannot make use of some existing logic. So this "advantage" does not distinguish your proposal from any other. > But you have a point. I could add "it doesn't use an IPv6 extension header" too. Well, there's lots of things it doesn't do. This particular point is only interesting if you are comparing your proposal to another proposal that does use IPv6 extension headers. Of course, if there were such a proposal, it would probably claim as an advantage "it doesn't modify the destination address field of a packet while the packet is in flight", thereby avoiding a whole set of unintended side-effects. (I do think it is good to avoid IPv6 extension headers, but none of the encapsulations that have been proposed to the WG use IPv6 extension headers, so this doesn't seem like much of an issue.) > I do not suggest to overwrite the destination address sent by the source. If you don't want to restore it later, it is possible. But this is obviously a bad idea if you need to restore it. > I was rather saying that the source can directly originate a packet which destination is a BIER IPv6 address. There is nothing to prevent a source from originating a packet with any kind of encapsulation whatsoever. > Or if the source sends an IPv6 multicast packets that you need to be sent through the BIER domain, you can encapsulate it inside the IPv6 BIER packet. Same as any other encapsulation. > >> If an enduser's UDP packet is carried as the payload of an IPv6 BIER packet, and the UDP packet has non-zero checksum, then, as the draft says, "the UDP checksum must be recomputed when the BIER bits are changed." So the BIER forwarding plane now has a new function -- it has to look to see what the payload is, and whether the the payload has a checksum that needs to be adjusted. Does that sound like a good idea? > I see at least two possibilities here: > - Update checksum at every BitString change. This is actually not so expensive given that the IP checksum is linear (i.e. support updates). Obviously this requires looking at layer 4. If your encapsulation requires that the forwarders look at layer 4, I'd say that is a pretty big disadvantage. > - Have a convention that the packet is checksumed with BitString set to all-zeroes. I don't think a BIER encapsulation should require that UDP be modified. > >> The draft says: "It is possible to configure a host with an address which corresponds to a BIER address with a single bit set. From the host perspective, such address is not different from a regular IPv6 address." Well, what will then stop the host from using that address as an IPv6 source address? > It is a feature, not a bug. A BIER IPv6 address with a single bit set is a valid unicast address. No it isn't. See my comments on using a "BIER IPv6 address" in the source address field. >> Packets carrying such an IPv6 source address may get dropped for using a prefix that has not been delegated to the host's subnet. >> >> If a host uses a "BIER address" as its source address in a given packet, and the packet doesn't get dropped, the packet may elicit responses that put the BIER address in their destination address fields. This seems like a security issue, as it creates an attack vector that can create 64 responses to a single probe. > Are you talking about BCP38 ? Ingress filtering means that a host cannot send a packet with any source address. Of course, if the host is assigned a BIER address, adjacent routers will have to be configured to not drop the packets that are originated with this source address. The need to configure adjacent routers this way doesn't seem like much of an advantage. > It doesn't mean that you allow the host to use any BIER address though. The first-hop router (or any other routers) can be configured to do a source address filtering (just like BCP 38) to make sure that the source address is not a BIER address with more than one bit set. More special case configuration needed in order to use this encapsulation. > >> Hopefully hosts will not treat the BIER prefix as a delegated prefix that they can use to compute their own "privacy addresses"; if any of those computed addresses make it to the source address field of an IPv6 packet, and the packet does not get dropped, chaos could ensue. > Why would you advertise an IPv6 BIER prefix with the M bit set to 0 (enabling SLAAC) in your RAs ?! I mean, there is no way SLAAC could be used for that purpose. You would use DHCPv6 (or some other equivalent) for address configuration anyway. Ahh, the old "it will never happen" defense. After all, bits never get set incorrectly, or in a way not anticipated by the authors of a specification ;-) Actually, every network disaster is preceded by a developer saying "that will never happen" because "no one would ever do that". >> The draft suggests that the BIER prefix can be treated by BFRs outside a given domain as a routable unicast prefix, presumably leading towards one or more BFRs that serve as border routers for a given BIER domain. (At one point, the draft even says that BIER packets are IPv6 unicast packets, which seems a bit misleading. ;-)) That's interesting, but putting this feature to use requires one to work out quite a few details that are not mentioned. And I don't think it will work for non-BFRs within the BIER domain. To pass BIER packet through non-BFRs within the destination BIER domain, one still needs additional encapsulation. > The document does not claim that you can have non-BFR routers within the BIER domain. That feature is supported by the architecture, so I guess this is another feature of the architecture that is not supported by your proposed encapsulation. > It just claims that you can use regular unicast forwarding between the source and the BFIR. > What sort of details do you think are not mentioned ? The description of the procedures that cause the FIBs to be set up appropriately in all the routers outside the BIER domain. Also, don't forget to consider the case of hosts that are multi-homed to several BIER domains. And the case of a host that is not directly connected to its BIER domain. If the BIER prefix leads a packet (via unicast forwarding) from the host to a distant BFIR, how will that same prefix lead a packet (via unicast forwarding) from the distant BIER domain to the host? > You can ! You can ! :-) > "Configured" means, "as far as the BIER Layer is concerned", whether this comes from an educated system administrator, a running process, or a monkey, I couldn't care less. > I will clarify in the next iteration. You have a companion draft describing the ISIS/OSPF/BGP extensions for doing the necessary signaling? >> It is not clear from the draft whether the value of i (number of bits in the SI field) and the set of BFR-ids is specific to a given prefix, or whether it is the same for all prefixes. (Or for all prefixes corresponding to a given domain. Or perhaps sub-domain?) > Well. This clearly is the kind of things that can be discussed, right ? > When I first thought about this approach, I made an experimental implementation for Linux. I ended up not caring about these. I didn't even implemented the concept of S.I., but rather decided that every BIER prefix would use a different 'bit index to next-hop' mapping table. So, I would say that the set of BRF-ids is specific to a given prefix. I would even say we can remove the concept of domain and S.I. But that is the sort of things that I would need BIER experts to discuss with. It seems like your "experimental implementation" does not comply with the BIER architecture. >> Section 6 gives the "advantages" of the proposal, but it is not clear what the proposal is being compared to. For instance, one of the advantages is claimed to be that the proposal doesn't use IPv6 extension headers. Is the proposal being compared to another proposal that does use IPv6 extension headers? If so, where is that proposal described? (None of the proposals I've seen so far use IPv6 extension headers.) > Okay. What encap should I compare it to ? There's not much point comparing it to a strawman that has neither been proposed to the WG in another draft nor described in this draft. >> Another "advantage" is that the proposal "may be used for transporting IP multicast packets, but also for sending IP payloads directly to multiple destinations". Does this "advantage" distinguish it from some other proposal? I'd have thought that any multicast encapsulation can cause any packet to sent to multiple destinations. > Only if the destination implements BIER. In this proposal, the destination does not need to decap anything. It directly receives a unicast packet. In most BIER encapsulation proposals, the decapsulation is done by the BFER, not by the destination host. > >> Of course, maybe the first question is whether we really have a need for an encapsulation that is IPv6-specific. The draft doesn't actually seem to address this question. >> > Do you think we shouldn't have another encap. ? It's true that I don't see a need for another encapsulation. But ... > Or are you saying we should have a different encap ? > But if we do have another encapsulation, it shouldn't be IPv6-specific, and it shouldn't require hop-by-hop modification of the IP destination address field, and it shouldn't require the BFRs to inspect layer 4, and it shouldn't require changes to layer 4, and it shouldn't allow a multicast address to be put in the IP source address field, and it shouldn't assume that bits never get set incorrectly, and it shouldn't require changes in source address filtering procedures. In addition, it should be possible to use it to support the entire BIER architecture, including those features that didn't make it into your experimental Linux implementation. From SRS0=B2+I=VD=darou.fr=pierre.pfister@bounces.m4x.org Thu Sep 15 10:29:15 2016 Return-Path: X-Original-To: bier@ietfa.amsl.com Delivered-To: bier@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 9BDA412B164 for ; Thu, 15 Sep 2016 10:29:15 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -4.2 X-Spam-Level: X-Spam-Status: No, score=-4.2 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.001, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_MED=-2.3, SPF_HELO_PASS=-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 5EqH4U3YFD-Z for ; Thu, 15 Sep 2016 10:29:11 -0700 (PDT) Received: from mx1.polytechnique.org (mx1.polytechnique.org [129.104.30.34]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 0C3B112B036 for ; Thu, 15 Sep 2016 10:29:10 -0700 (PDT) Received: from [10.228.42.58] (unknown [173.38.220.47]) (using TLSv1 with cipher ECDHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by ssl.polytechnique.org (Postfix) with ESMTPSA id 1102C5647F3; Thu, 15 Sep 2016 19:29:07 +0200 (CEST) Content-Type: multipart/alternative; boundary="Apple-Mail=_F9969E9F-9CD2-419C-93DA-1E717C2F6A21" Mime-Version: 1.0 (Mac OS X Mail 9.3 \(3124\)) From: Pierre Pfister In-Reply-To: <08b8ac29-459a-d5e5-524d-7b84d744b020@juniper.net> Date: Thu, 15 Sep 2016 19:29:06 +0200 Message-Id: References: <147280131368.24750.2582129788572723864.idtracker@ietfa.amsl.com> <3C470D17-363E-4F7D-B943-19FC52052C67@darou.fr> <10B5F14B-8A1B-4DFC-B21E-A314B1605213@darou.fr> <08b8ac29-459a-d5e5-524d-7b84d744b020@juniper.net> To: Eric C Rosen X-Mailer: Apple Mail (2.3124) X-AV-Checked: ClamAV using ClamSMTP at svoboda.polytechnique.org (Thu Sep 15 19:29:07 2016 +0200 (CEST)) Archived-At: Cc: bier@ietf.org, IJsbrand Wijnands Subject: Re: [Bier] New Version Notification for draft-pfister-bier-over-ipv6-00.txt X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.17 Precedence: list List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 15 Sep 2016 17:29:34 -0000 --Apple-Mail=_F9969E9F-9CD2-419C-93DA-1E717C2F6A21 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=utf-8 > Le 15 sept. 2016 =C3=A0 17:16, Eric C Rosen a = =C3=A9crit : >=20 >=20 >>> It is worth emphasizing that, unlike other proposed encapsulations, = this encapsulation only supports BitStrings of length 64. Well, = 128-p-i. I guess one could use a /40 prefix and a single SI to get a = BitStringLength of 88 if one doesn't need any more than 88 BFR-ids in = the domain. It still seems rather restrictive when compared to the = other encapsulations that have been proposed. >> IMHO, what really matters is the ratio of packets sent over the = number of reached destinations. =46rom that regard, a case with 1024 = long BitString and 1M destinations with random access will not be very = efficient. In some cases, 64 destinations are far enough. As you noted, = we already have an encapsulation which can handle longer BitString, so I = guess we'll have to evaluate whether other use cases, 1., need more = bits, 2., can use the existing MPLS encap. >=20 > You should point out then that your encapsulation does not support the = full functionality of the BIER architecture as specified by the WG, but = only an arbitrarily chosen subset of it. You may see an arbitrarily chosen subset of features where others may = see applicability to different use-cases such as enterprise or home = networks, and IP networks rather than MPLS networks.=20 The purpose of a new encapsulation is not to provide a second solution = addressing the exact same issue and use-cases but rather see the areas = where the first encap is not applicable. The BIER architecture document is a draft. The working group may realize = than it does not fully handle certain use-case yet. >=20 >>> I don't see how the sub-domain is identified in this encapsulation. >> It is not addressed by the document indeed. Just for the sake of = making a short document. >>=20 >=20 > This is another way in which your proposal fails to support the BIER = architecture. No.=20 This is a way to say that the proposal is a first iteration which will = be improved and include sub-domains in further iterations if people = think it is necessary. You removed part of my answer too: "I guess we could use the IPv6 prefix = for that as well.". Any useful technical comments on this proposal ? >=20 >>> The draft says: "It makes use of a typical IP longest match in order = to decide whether a packet is a BIER packet or not, which means hardware = and software existing solutions may be used for that purpose." But = existing/deployed hardware and software solutions cannot do the BIER = forwarding! So I don't see what advantage is being claimed here. Or is = this just a way of saying "at least we don't use IPv6 extension headers" = ;-) >> It is a way to say "Hey, you will be able to reuse bits of hardware = and code rather than restart everything from scratch". >=20 > I don't think there is any proposed encapsulation whose implementation = cannot make use of some existing logic. So this "advantage" does not = distinguish your proposal from any other. Please read carefully. I am not saying that the proposal "can make use = of some existing logic". I am saying it makes use of longest match on = the destination address in order to determine whether the packet is a = BIER packet, the Set ID, and possibly the sub-domain. Longest match prefix is not just a random piece of existing logic. It is = widely optimized on both hardware and software. In addition, it means that packet classification can be achieved by the = use of the already existing routing operation. Which will simplify = development and deployment. Hence, this is an advantage. >=20 > If your encapsulation requires that the forwarders look at layer 4, = I'd say that is a pretty big disadvantage. >=20 > I don't think a BIER encapsulation should require that UDP be = modified. Which means we shouldn't use encapsulation within UDP either. But you also mention that we shouldn't use IPv6 Extension Headers. So this leaves us only encapsulation over Ethernet. Can you elaborate if you think this is a better alternative ? >=20 >>=20 >>> The draft says: "It is possible to configure a host with an address = which corresponds to a BIER address with a single bit set. =46rom the = host perspective, such address is not different from a regular IPv6 = address." Well, what will then stop the host from using that address as = an IPv6 source address? >> It is a feature, not a bug. A BIER IPv6 address with a single bit set = is a valid unicast address. >=20 > No it isn't. See my comments on using a "BIER IPv6 address" in the = source address field. See my answer. >=20 >>> Packets carrying such an IPv6 source address may get dropped for = using a prefix that has not been delegated to the host's subnet. >>>=20 >>> If a host uses a "BIER address" as its source address in a given = packet, and the packet doesn't get dropped, the packet may elicit = responses that put the BIER address in their destination address fields. = This seems like a security issue, as it creates an attack vector that = can create 64 responses to a single probe. >> Are you talking about BCP38 ? Ingress filtering means that a host = cannot send a packet with any source address. Of course, if the host is = assigned a BIER address, adjacent routers will have to be configured to = not drop the packets that are originated with this source address. >=20 > The need to configure adjacent routers this way doesn't seem like much = of an advantage. Yes. Routers that are adjacent to hosts will have to run or relay = DHCPv6. Which is pretty much necessary when you deal with hosts. >=20 >> It doesn't mean that you allow the host to use any BIER address = though. The first-hop router (or any other routers) can be configured to = do a source address filtering (just like BCP 38) to make sure that the = source address is not a BIER address with more than one bit set. >=20 > More special case configuration needed in order to use this = encapsulation. Just DHCPv6. >>> The draft suggests that the BIER prefix can be treated by BFRs = outside a given domain as a routable unicast prefix, presumably leading = towards one or more BFRs that serve as border routers for a given BIER = domain. (At one point, the draft even says that BIER packets are IPv6 = unicast packets, which seems a bit misleading. ;-)) That's interesting, = but putting this feature to use requires one to work out quite a few = details that are not mentioned. And I don't think it will work for = non-BFRs within the BIER domain. To pass BIER packet through non-BFRs = within the destination BIER domain, one still needs additional = encapsulation. >> The document does not claim that you can have non-BFR routers within = the BIER domain. >=20 > That feature is supported by the architecture, so I guess this is = another feature of the architecture that is not supported by your = proposed encapsulation. Are you referring to this sentence ? "BIER would then have to be run in a sub-domain that is bound to this topology. If unicast tunnels are used to bypass non-BFRs, either the tunnels have to be restricted to this topology, or the tunnel endpoints have to be BFRs that do not have any non-BIER-capable interfaces." It seemed pretty obvious to me that an IP based solution could use = tunneling to solve this issue. >=20 >> It just claims that you can use regular unicast forwarding between = the source and the BFIR. >> What sort of details do you think are not mentioned ? >=20 > The description of the procedures that cause the FIBs to be set up = appropriately in all the routers outside the BIER domain. =46rom the draft: If the BIER IPv6 Prefix is a globally unique IPv6 prefix, reachable from outside the BIER domain, it is possible to send a packet from outside the BIER domain to multiple destination within the BIER domain. I don't think it is necessary to describe in more details the many ways = a unicast prefix can be made reachable from a private or public part of the internet. >=20 > Also, don't forget to consider the case of hosts that are multi-homed = to several BIER domains. I don't think bier WG is exactly chartered to solve host multi-homing. = ;-) >=20 > And the case of a host that is not directly connected to its BIER = domain. If the BIER prefix leads a packet (via unicast forwarding) from = the host to a distant BFIR, how will that same prefix lead a packet (via = unicast forwarding) from the distant BIER domain to the host? I don't claim it does. >=20 >> You can ! You can ! :-) >> "Configured" means, "as far as the BIER Layer is concerned", whether = this comes from an educated system administrator, a running process, or = a monkey, I couldn't care less. >> I will clarify in the next iteration. > You have a companion draft describing the ISIS/OSPF/BGP extensions for = doing the necessary signaling? I don't think it should be any different from the documents related to = the other encaps. At least, I think those extensions should be agnostic. If you see reasons or cases where they are not, I would be interested to = know more. >>> It is not clear from the draft whether the value of i (number of = bits in the SI field) and the set of BFR-ids is specific to a given = prefix, or whether it is the same for all prefixes. (Or for all = prefixes corresponding to a given domain. Or perhaps sub-domain?) >> Well. This clearly is the kind of things that can be discussed, right = ? >> When I first thought about this approach, I made an experimental = implementation for Linux. I ended up not caring about these. I didn't = even implemented the concept of S.I., but rather decided that every BIER = prefix would use a different 'bit index to next-hop' mapping table. So, = I would say that the set of BRF-ids is specific to a given prefix. I = would even say we can remove the concept of domain and S.I. But that is = the sort of things that I would need BIER experts to discuss with. > It seems like your "experimental implementation" does not comply with = the BIER architecture. It does. Because it implements the required features and behaves in a = way that is in agreement with the BIER architecture draft. I am just giving implementation feedback stating that, in this = particular case, the implementation does not need to explicitly consider = the notion of S.I. in order to be compliant. >=20 >>> Another "advantage" is that the proposal "may be used for = transporting IP multicast packets, but also for sending IP payloads = directly to multiple destinations". Does this "advantage" distinguish = it from some other proposal? I'd have thought that any multicast = encapsulation can cause any packet to sent to multiple destinations. >> Only if the destination implements BIER. In this proposal, the = destination does not need to decap anything. It directly receives a = unicast packet. >=20 > In most BIER encapsulation proposals, the decapsulation is done by the = BFER, not by the destination host. Nothing prevents a BFER to be the destination of a packet though. So I don't exactly see your point. >=20 >>=20 >>> Of course, maybe the first question is whether we really have a need = for an encapsulation that is IPv6-specific. The draft doesn't actually = seem to address this question. >>>=20 >> Do you think we shouldn't have another encap. ? >=20 > It's true that I don't see a need for another encapsulation. But ... >=20 >> Or are you saying we should have a different encap ? >>=20 > But if we do have another encapsulation, it shouldn't be = IPv6-specific, and it shouldn't require hop-by-hop modification of the = IP destination address field, and it shouldn't require the BFRs to = inspect layer 4, and it shouldn't require changes to layer 4, and > it shouldn't allow a multicast address to be put in the IP source = address field Where did you see this ?! As stated in a previous comment. You say no Layer 4, no extension = headers, no IP header.=20 This just leaves us to Ethernet layer. Which one is more specific ? Ethernet or IPv6 ? > , and it shouldn't assume that bits never get set incorrectly, Can I assume that the BIER BitString and the IP version number are set = correctly ? > and it shouldn't require changes in source address filtering = procedures. =20 It doesn't. --Apple-Mail=_F9969E9F-9CD2-419C-93DA-1E717C2F6A21 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=utf-8
Le 15 sept. 2016 =C3=A0 17:16, Eric C Rosen <erosen@juniper.net> = a =C3=A9crit :


It is worth emphasizing = that, unlike other proposed encapsulations, this encapsulation only = supports BitStrings of length 64.  Well, 128-p-i.  I guess one = could use a /40 prefix and a single SI to get a BitStringLength of 88 if = one doesn't need any more than 88 BFR-ids in the domain.  It still = seems rather restrictive when compared to the other encapsulations that = have been proposed.
IMHO, what really matters = is the ratio of packets sent over the number of reached destinations. = =46rom that regard, a case with 1024 long BitString and 1M destinations = with random access will not be very efficient. In some cases, 64 = destinations are far enough. As you noted, we already have an = encapsulation which can handle longer BitString, so I guess we'll have = to evaluate whether other use cases, 1., need more bits, 2., can use the = existing MPLS encap.

You = should point out then that your encapsulation does not support the full = functionality of the BIER architecture as specified by the WG, but only = an arbitrarily chosen subset of it.

You = may see an arbitrarily chosen subset of features where others may see = applicability to different use-cases such as enterprise or home = networks, and IP networks rather than MPLS networks. 
The = purpose of a new encapsulation is not to provide a second solution = addressing the exact same issue and use-cases but rather see the areas = where the first encap is not applicable.

The BIER architecture document is a draft. The = working group may realize than it does not fully handle certain use-case = yet.


I don't see how the = sub-domain is identified in this encapsulation.
It is not addressed by the document indeed. Just = for the sake of making a short document.


This is another way in which your = proposal fails to support the BIER architecture.

No. 
This is a way to say that the = proposal is a first iteration which will be improved and include = sub-domains in further iterations if people think it is = necessary.

You removed part of my = answer too: "I guess we could use the IPv6 prefix for that as = well.".
Any useful technical comments on this proposal = ?


The draft says: "It = makes use of a typical IP longest match in order to decide whether a = packet is a BIER packet or not, which means hardware and software = existing solutions may be used for that purpose."  But = existing/deployed hardware and software solutions cannot do the BIER = forwarding!  So I don't see what advantage is being claimed here. =  Or is this just a way of saying "at least we don't use IPv6 = extension headers" ;-)
It is a way to say = "Hey, you will be able to reuse bits of hardware and code rather than = restart everything from scratch".

I don't think there is any proposed encapsulation whose = implementation cannot make use of some existing logic.  So this = "advantage" does not distinguish your proposal from any = other.

Please = read carefully. I am not saying that the proposal "can make use of some = existing logic". I am saying it makes use of longest match on the = destination address in order to determine whether the packet is a BIER = packet, the Set ID, and possibly the sub-domain.
Longest match = prefix is not just a random piece of existing logic. It is widely = optimized on both hardware and software.
In addition, it means = that packet classification can be achieved by the use of the already = existing routing operation. Which will simplify development and = deployment.
Hence, this is an advantage.


If your encapsulation requires that the = forwarders look at layer 4, I'd say that is a pretty big = disadvantage.

I don't think = a BIER encapsulation should require that UDP be modified.

Which = means we shouldn't use encapsulation within UDP either.
But = you also mention that we shouldn't use IPv6 Extension = Headers.
So this leaves us only encapsulation over = Ethernet.
Can you elaborate if you think this is a better = alternative ?



The draft says: "It is possible to configure a host with an = address which corresponds to a BIER address with a single bit set. =  =46rom the host perspective, such address is not different from a = regular IPv6 address."  Well, what will then stop the host from = using that address as an IPv6 source address?
It is a feature, not a bug. A BIER IPv6 address = with a single bit set is a valid unicast address.

No it isn't.  See my = comments on using a "BIER IPv6 address" in the source address = field.

See my = answer.


Packets carrying such an = IPv6 source address may get dropped for using a prefix that has not been = delegated to the host's subnet.

If a host = uses a "BIER address" as its source address in a given packet, and the = packet doesn't get dropped, the packet may elicit responses that put the = BIER address in their destination address fields.  This seems like = a security issue, as it creates an attack vector that can create 64 = responses to a single probe.
Are you talking = about BCP38 ? Ingress filtering means that a host cannot send a packet = with any source address. Of course, if the host is assigned a BIER = address, adjacent routers will have to be configured to not drop the = packets that are originated with this source address.

The need to configure adjacent = routers this way doesn't seem like much of an advantage.

Yes. = Routers that are adjacent to hosts will have to run or relay = DHCPv6.
Which is pretty much necessary when you deal with = hosts.


It doesn't mean that you allow the host to use any BIER = address though. The first-hop router (or any other routers) can be = configured to do a source address filtering (just like BCP 38) to make = sure that the source address is not a BIER address with more than one = bit set.

More special case = configuration needed in order to use this encapsulation.

Just = DHCPv6.

The draft suggests that = the BIER prefix can be treated by BFRs outside a given domain as a = routable unicast prefix, presumably leading towards one or more BFRs = that serve as border routers for a given BIER domain.  (At one = point, the draft even says that BIER packets are IPv6 unicast packets, = which seems a bit misleading. ;-)) That's interesting, but putting this = feature to use requires one to work out quite a few details that are not = mentioned.  And I don't think it will work for non-BFRs within the = BIER domain.  To pass BIER packet through non-BFRs within the = destination BIER domain, one still needs additional encapsulation.
The document does not claim that you can have = non-BFR routers within the BIER domain.

That feature is supported by the architecture, so I guess = this is another feature of the architecture that is not supported by = your proposed encapsulation.

Are = you referring to this sentence ?
"BIER would then have to be run in a
   sub-domain that is =
bound to this topology.  If unicast tunnels are
   used to bypass non-BFRs, either the tunnels have to be restricted to
   this topology, or the tunnel endpoints have to be BFRs that do not
   have any non-BIER-capable interfaces."

It seemed pretty obvious to me that an = IP based solution could use tunneling to solve this issue.


It just = claims that you can use regular unicast forwarding between the source = and the BFIR.
What sort of details do you think are not = mentioned ?

The description of = the procedures that cause the FIBs to be set up appropriately in all the = routers outside the BIER domain.

=46rom = the draft:
If the =
BIER IPv6
      Prefix is a globally unique IPv6 prefix, reachable from outside
      the BIER domain, it is possible to send a packet from outside the
      BIER domain to multiple destination within the BIER =
domain.

I don't = think it is necessary to describe in more details the many ways a = unicast prefix can be made reachable from
a private or public = part of the internet.


Also, don't = forget to consider the case of hosts that are multi-homed to several = BIER domains.

I = don't think bier WG is exactly chartered to solve host multi-homing. = ;-)


And the case of a host that is = not directly connected to its BIER domain.  If the BIER prefix = leads a packet (via unicast forwarding) from the host to a distant BFIR, = how will that same prefix lead a packet (via unicast forwarding) from = the distant BIER domain to the host?

I = don't claim it does.


You can ! You can ! :-)
"Configured" means, "as far as the BIER Layer is concerned", = whether this comes from an educated system administrator, a running = process, or a monkey, I couldn't care less.
I will clarify = in the next iteration.
You have a companion = draft describing the ISIS/OSPF/BGP extensions for doing the necessary = signaling?

I don't think it should be any different from the = documents related to the other encaps.
At least, I think those = extensions should be agnostic.
If you see reasons or cases = where they are not, I would be interested to know more.

It is not clear from the draft whether the value of i (number = of bits in the SI field) and the set of BFR-ids is specific to a given = prefix, or whether it is the same for all prefixes.  (Or for all = prefixes corresponding to a given domain.  Or perhaps = sub-domain?)
Well. This clearly is the kind = of things that can be discussed, right ?
When I first = thought about this approach, I made an experimental implementation for = Linux. I ended up not caring about these. I didn't even implemented the = concept of S.I., but rather decided that every BIER prefix would use a = different 'bit index to next-hop' mapping table. So, I would say that = the set of BRF-ids is specific to a given prefix. I would even say we = can remove the concept of domain and S.I. But that is the sort of things = that I would need BIER experts to discuss with.
It seems like your "experimental implementation" = does not comply with the BIER architecture.

It = does. Because it implements the required features and behaves in a way = that is in agreement with the BIER architecture draft.
I am = just giving implementation feedback stating that, in this particular = case, the implementation does not need to explicitly consider the notion = of S.I. in order to be compliant.


Another "advantage" is that the proposal "may be used for = transporting IP multicast packets, but also for sending IP payloads = directly to multiple destinations".  Does this "advantage" = distinguish it from some other proposal?  I'd have thought that any = multicast encapsulation can cause any packet to sent to multiple = destinations.
Only if the destination = implements BIER. In this proposal, the destination does not need to = decap anything. It directly receives a unicast packet.

In most BIER encapsulation = proposals, the decapsulation is done by the BFER, not by the destination = host.

Nothing prevents a BFER to be the destination of a = packet though.
So I don't exactly see your point.



Of course, maybe the = first question is whether we really have a need for an encapsulation = that is IPv6-specific.  The draft doesn't actually seem to address = this question.

Do you think we = shouldn't have another encap. ?

It's true that I don't see a need for another encapsulation. =  But ...

Or are you saying we should have a different encap ?

But if we do have another = encapsulation, it shouldn't be IPv6-specific, and it shouldn't require = hop-by-hop modification of the IP destination address field, and it = shouldn't require the BFRs to inspect layer 4, and it shouldn't require = changes to layer 4, and

it shouldn't allow a multicast address to be put in the IP = source address field
Where did you see this = ?!

As stated in a previous comment. = You say no Layer 4, no extension headers, no IP = header. 
This just leaves us to Ethernet = layer.

Which one is more specific ? = Ethernet or IPv6 ?

, and it shouldn't assume = that bits never get set incorrectly,

Can I assume that the BIER BitString and the IP = version number are set correctly ?

and it = shouldn't require changes in source address filtering procedures. =  

It = doesn't.





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charset="utf-8"; format=flowed Content-Transfer-Encoding: 8bit Sometimes an idea that seems clever at first just doesn't work out when the details are examined. The idea of using addresses that are unicast addresses in one context but multicast addresses in another falls into this category. Inevitably a host will put a multicast address into an IP source address field, because the host doesn't really have any way of knowing that it is doing something wrong. Inevitably a host will create temporary IPv6 addresses from the BIER prefix, because it doesn't know that it is doing something wrong. It's hard for routers to filter out packets carrying such addresses in the source address field, because the local routers also cannot necessarily tell that the address is really a multicast address. There are just too many unintended side-effects for this to be a viable proposal. The only answer has been "this won't happen unless someone does something wrong", which is not an answer at all. On 9/15/2016 1:29 PM, Pierre Pfister wrote: > >> Le 15 sept. 2016 à 17:16, Eric C Rosen > > a écrit : >> >> >> You should point out then that your encapsulation does not support >> the full functionality of the BIER architecture as specified by the >> WG, but only an arbitrarily chosen subset of it. > > You may see an arbitrarily chosen subset of features where others may > see applicability to different use-cases such as enterprise or home > networks, and IP networks rather than MPLS networks. > The purpose of a new encapsulation is not to provide a second solution > addressing the exact same issue and use-cases but rather see the areas > where the first encap is not applicable. Any BIER encapsulation needs to be able to support the features that are in the architecture. It may or may not be true that the architecture is missing features that it should have, but the encapsulations still need to support the features that it does have. >> >>>> I don't see how the sub-domain is identified in this encapsulation. >>> It is not addressed by the document indeed. Just for the sake of >>> making a short document. >>> >> >> This is another way in which your proposal fails to support the BIER >> architecture. > > No. > This is a way to say that the proposal is a first iteration which will > be improved and include sub-domains in further iterations if people > think it is necessary. Well, it's hard to comment on what might or might not be in further iterations. > > You removed part of my answer too: "I guess we could use the IPv6 > prefix for that as well.". > Any useful technical comments on this proposal ? At that level of detail there isn't much to comment on. I would like to see the proposed signaling that associates the prefix with a sub-domain and/or other BIER parameters. > >> >>>> The draft says: "It makes use of a typical IP longest match in >>>> order to decide whether a packet is a BIER packet or not, which >>>> means hardware and software existing solutions may be used for that >>>> purpose." But existing/deployed hardware and software solutions >>>> cannot do the BIER forwarding! So I don't see what advantage is >>>> being claimed here. Or is this just a way of saying "at least we >>>> don't use IPv6 extension headers" ;-) >>> It is a way to say "Hey, you will be able to reuse bits of hardware >>> and code rather than restart everything from scratch". >> >> I don't think there is any proposed encapsulation whose >> implementation cannot make use of some existing logic. So this >> "advantage" does not distinguish your proposal from any other. > > Please read carefully. I am not saying that the proposal "can make use > of some existing logic". I am saying it makes use of longest match on > the destination address in order to determine whether the packet is a > BIER packet, the Set ID, and possibly the sub-domain. > Longest match prefix is not just a random piece of existing logic. It > is widely optimized on both hardware and software. > In addition, it means that packet classification can be achieved by > the use of the already existing routing operation. Which will simplify > development and deployment. > Hence, this is an advantage. In some other proposals for a second encaps, a packet is identified as a BIER packet by virtue of the value of the ethertype field. I just don't see the advantage of using the "widely optimized" longest match procedures rather than doing a simple lookup of a fixed length field. > >> >> If your encapsulation requires that the forwarders look at layer 4, >> I'd say that is a pretty big disadvantage. >> >> I don't think a BIER encapsulation should require that UDP be modified. > > Which means we shouldn't use encapsulation within UDP either. I don't see why that follows, but we're not discussing a UDP-based encapsulation right now. > But you also mention that we shouldn't use IPv6 Extension Headers. > So this leaves us only encapsulation over Ethernet. > Can you elaborate if you think this is a better alternative ? The ethernet encapsulation proposals certainly do not have the same set of problems that the IPv6 proposal has. > > Yes. Routers that are adjacent to hosts will have to run or relay DHCPv6. > Which is pretty much necessary when you deal with hosts. That doesn't seem to be true; right now I am on a network where the CPE router is a dhcpv6 client of the ISP router, but the hosts behind the CPE router only receive router advertisement messages. But that's all irrelevant anyway, as "DCHPv6 will prevent any addressing problems from occurring" is not a credible claim. > >>>> The draft suggests that the BIER prefix can be treated by BFRs >>>> outside a given domain as a routable unicast prefix, presumably >>>> leading towards one or more BFRs that serve as border routers for a >>>> given BIER domain. (At one point, the draft even says that BIER >>>> packets are IPv6 unicast packets, which seems a bit misleading. >>>> ;-)) That's interesting, but putting this feature to use requires >>>> one to work out quite a few details that are not mentioned. And I >>>> don't think it will work for non-BFRs within the BIER domain. To >>>> pass BIER packet through non-BFRs within the destination BIER >>>> domain, one still needs additional encapsulation. >>> The document does not claim that you can have non-BFR routers within >>> the BIER domain. >> >> That feature is supported by the architecture, so I guess this is >> another feature of the architecture that is not supported by your >> proposed encapsulation. > > It seemed pretty obvious to me that an IP based solution could use > tunneling to solve this issue. In your proposal, the IPv6 prefix can cause a packet to be unicast-routed to a BIER domain. If the first router it encounters in the BIER domain is a non-BFR, I don't see how tunneling will help. You'll probably say that this situation is impossible, but since the draft provides no details about how the prefixes are distributed, I don't see any basis for saying that this couldn't happen. > >> >>> It just claims that you can use regular unicast forwarding between >>> the source and the BFIR. >>> What sort of details do you think are not mentioned ? >> >> The description of the procedures that cause the FIBs to be set up >> appropriately in all the routers outside the BIER domain. > > From the draft: > If the BIER IPv6 > Prefix is a globally unique IPv6 prefix, reachable from outside > the BIER domain, it is possible to send a packet from outside the > BIER domain to multiple destination within the BIER domain. > > I don't think it is necessary to describe in more details the many > ways a unicast prefix can be made reachable from > a private or public part of the internet. I'm afraid the situation is a bit more complicated. The prefix is meant to be interpreted as a unicast prefix in certain contexts, but as a BIER prefix in other contexts. The signaling and routing procedures need to ensure that the prefix will be interpreted, by each router to which it is propagated, in the context that is appropriate for that router. There are a lot of non-obvious details needed to make this happen. > >> >> Also, don't forget to consider the case of hosts that are multi-homed >> to several BIER domains. > > I don't think bier WG is exactly chartered to solve host multi-homing. ;-) I don't see the relevance of that claim. Many devices are multi-homed and BIER cannot assume that there is no multi-homing. Of course, BIER doesn't have to solve multi-homing issues that are not related to BIER. > >> >> And the case of a host that is not directly connected to its BIER >> domain. If the BIER prefix leads a packet (via unicast forwarding) >> from the host to a distant BFIR, how will that same prefix lead a >> packet (via unicast forwarding) from the distant BIER domain to the host? > > I don't claim it does. If the prefix is part of a unicast address of a host, it has to lead packets toward the host. If the prefix identifies a BIER domain, it has to lead packets toward the BIER domain. If the host isn't directly connected to the BIER domain, I don't see how this will work. So there must be some restrictions on how these addresses and prefixes are assigned. Perhaps these restrictions are included among the details that are" too obvious" to mention. Of course, a lot of things seem obvious until you try to work out the details. > >> >> You have a companion draft describing the ISIS/OSPF/BGP extensions >> for doing the necessary signaling? > > I don't think it should be any different from the documents related to > the other encaps. > At least, I think those extensions should be agnostic. > If you see reasons or cases where they are not, I would be interested > to know more. I don't think any of the existing drafts on ISIS/OSPF/BGP signaling for BIER say how to associate IPv6 prefixes with BIER parameters. Please don't say that the details are too obvious to mention! Has any consideration even been given to the signaling that needs to exist in order to support this encapsulation? > >>> >>> When I first thought about this approach, I made an experimental >>> implementation for Linux. I ended up not caring about these. I >>> didn't even implemented the concept of S.I., but rather decided that >>> every BIER prefix would use a different 'bit index to next-hop' >>> mapping table. So, I would say that the set of BRF-ids is specific >>> to a given prefix. I would even say we can remove the concept of >>> domain and S.I. But that is the sort of things that I would need >>> BIER experts to discuss with. >> It seems like your "experimental implementation" does not comply with >> the BIER architecture. > > It does. Because it implements the required features and behaves in a > way that is in agreement with the BIER architecture draft. > I am just giving implementation feedback stating that, in this > particular case, the implementation does not need to explicitly > consider the notion of S.I. in order to be compliant. An implementation that doesn't support SI is not compliant with the architecture. > >> >>>> Another "advantage" is that the proposal "may be used for >>>> transporting IP multicast packets, but also for sending IP payloads >>>> directly to multiple destinations". Does this "advantage" >>>> distinguish it from some other proposal? I'd have thought that any >>>> multicast encapsulation can cause any packet to sent to multiple >>>> destinations. >>> Only if the destination implements BIER. In this proposal, the >>> destination does not need to decap anything. It directly receives a >>> unicast packet. >> >> In most BIER encapsulation proposals, the decapsulation is done by >> the BFER, not by the destination host. > > Nothing prevents a BFER to be the destination of a packet though. > So I don't exactly see your point. The point is that, for all encapsulations, decapsulation is done by the BFER, not by the destination. So the fact that the destination doesn't have to do decapsulation does not distinguish one encapsulation from another. You might be claiming, as an advantage, that BFERs don't always have to decapsulate and that BFIRs don't always have to encapsulate. This is the old "nat vs. tunneling" rathole. In the particular case of BIER, there is a set of problems caused by modifying the destination address field and by obscuring the distinction between multicast addresses and unicast addresses. These seem to dominate any apparent advantage of not having to encapsulate. > >> But if we do have another encapsulation, it shouldn't be >> IPv6-specific, and it shouldn't require hop-by-hop modification of >> the IP destination address field, and it shouldn't require the BFRs >> to inspect layer 4, and it shouldn't require changes to layer 4, and > >> it shouldn't allow a multicast address to be put in the IP source >> address field > Where did you see this ?! This is the inevitable consequence of making it impossible for hosts or even routers to tell the difference between multicast addresses and unicast addresses. > >> , and it shouldn't assume that bits never get set incorrectly, > > Can I assume that the BIER BitString and the IP version number are set > correctly ? It is always necessary to understand the impact on the network of configurations that are imperfect. Certainly one cannot assume that the router advertisement configuration files always have the flags set correctly. > >> and it shouldn't require changes in source address filtering procedures. > > It doesn't. Of course it does, because certain prefixes that are advertised to the hosts are now going to be prohibited from appearing in the source address field. --------------0D3828C1C293FE32F60C42D5 Content-Type: text/html; charset="utf-8" Content-Transfer-Encoding: 8bit Sometimes an idea that seems clever at first just doesn't work out when the details are examined.  The idea of using addresses that are unicast addresses in one context but multicast addresses in another falls into this category.  Inevitably a host will put a multicast address into an IP source address field, because the host doesn't really have any way of knowing that it is doing something wrong.  Inevitably a host will create temporary IPv6 addresses from the BIER prefix, because it doesn't know that it is doing something wrong.  It's hard for routers to filter out packets carrying such addresses in the source address field, because the local routers also cannot necessarily tell that the address is really a multicast address.  There are just too many unintended side-effects for this to be a viable proposal.

The only answer has been "this won't happen unless someone does something wrong", which is not an answer at all.   


On 9/15/2016 1:29 PM, Pierre Pfister wrote:

Le 15 sept. 2016 à 17:16, Eric C Rosen <erosen@juniper.net> a écrit :


You should point out then that your encapsulation does not support the full functionality of the BIER architecture as specified by the WG, but only an arbitrarily chosen subset of it.

You may see an arbitrarily chosen subset of features where others may see applicability to different use-cases such as enterprise or home networks, and IP networks rather than MPLS networks. 
The purpose of a new encapsulation is not to provide a second solution addressing the exact same issue and use-cases but rather see the areas where the first encap is not applicable.

Any BIER encapsulation needs to be able to support the features that are in the architecture. 

It may or may not be true that the architecture is missing features that it should have, but the encapsulations still need to support the features that it does have.


I don't see how the sub-domain is identified in this encapsulation.
It is not addressed by the document indeed. Just for the sake of making a short document.


This is another way in which your proposal fails to support the BIER architecture.

No. 
This is a way to say that the proposal is a first iteration which will be improved and include sub-domains in further iterations if people think it is necessary.

Well, it's hard to comment on what might or might not be in further iterations.


You removed part of my answer too: "I guess we could use the IPv6 prefix for that as well.".
Any useful technical comments on this proposal ?

At that level of detail there isn't much to comment on.  I would like to see the proposed signaling that associates the prefix with a sub-domain and/or other BIER parameters. 



The draft says: "It makes use of a typical IP longest match in order to decide whether a packet is a BIER packet or not, which means hardware and software existing solutions may be used for that purpose."  But existing/deployed hardware and software solutions cannot do the BIER forwarding!  So I don't see what advantage is being claimed here.  Or is this just a way of saying "at least we don't use IPv6 extension headers" ;-)
It is a way to say "Hey, you will be able to reuse bits of hardware and code rather than restart everything from scratch".

I don't think there is any proposed encapsulation whose implementation cannot make use of some existing logic.  So this "advantage" does not distinguish your proposal from any other.

Please read carefully. I am not saying that the proposal "can make use of some existing logic". I am saying it makes use of longest match on the destination address in order to determine whether the packet is a BIER packet, the Set ID, and possibly the sub-domain.
Longest match prefix is not just a random piece of existing logic. It is widely optimized on both hardware and software.
In addition, it means that packet classification can be achieved by the use of the already existing routing operation. Which will simplify development and deployment.
Hence, this is an advantage.

 In some other proposals for a second encaps, a packet is identified as a BIER  packet by virtue of the value of the ethertype field.  I just don't see the advantage of using the "widely optimized" longest match procedures rather than doing a simple lookup of a fixed length field.



If your encapsulation requires that the forwarders look at layer 4, I'd say that is a pretty big disadvantage.

I don't think a BIER encapsulation should require that UDP be modified.

Which means we shouldn't use encapsulation within UDP either.

I don't see why that follows, but we're not discussing a UDP-based encapsulation right now.

But you also mention that we shouldn't use IPv6 Extension Headers.
So this leaves us only encapsulation over Ethernet.
Can you elaborate if you think this is a better alternative ?

The ethernet encapsulation proposals certainly do not have the same set of problems that the IPv6 proposal has.


Yes. Routers that are adjacent to hosts will have to run or relay DHCPv6.
Which is pretty much necessary when you deal with hosts.

That doesn't seem to be true; right now I am on a network where the CPE router is a dhcpv6 client of the ISP router, but the hosts behind the CPE router only receive router advertisement messages.

But that's all irrelevant anyway, as "DCHPv6 will prevent any addressing problems from occurring" is not a credible claim.


The draft suggests that the BIER prefix can be treated by BFRs outside a given domain as a routable unicast prefix, presumably leading towards one or more BFRs that serve as border routers for a given BIER domain.  (At one point, the draft even says that BIER packets are IPv6 unicast packets, which seems a bit misleading. ;-)) That's interesting, but putting this feature to use requires one to work out quite a few details that are not mentioned.  And I don't think it will work for non-BFRs within the BIER domain.  To pass BIER packet through non-BFRs within the destination BIER domain, one still needs additional encapsulation.
The document does not claim that you can have non-BFR routers within the BIER domain.

That feature is supported by the architecture, so I guess this is another feature of the architecture that is not supported by your proposed encapsulation.

It seemed pretty obvious to me that an IP based solution could use tunneling to solve this issue.

In your proposal, the IPv6 prefix can cause a packet to be unicast-routed to a BIER domain.  If the first router it encounters in the BIER domain is a non-BFR, I don't see how tunneling will help.  You'll probably say that this situation is impossible, but since the draft provides no details about how the prefixes are distributed, I don't see any basis for saying that this couldn't happen.



It just claims that you can use regular unicast forwarding between the source and the BFIR.
What sort of details do you think are not mentioned ?

The description of the procedures that cause the FIBs to be set up appropriately in all the routers outside the BIER domain.

From the draft:
If the BIER IPv6
      Prefix is a globally unique IPv6 prefix, reachable from outside
      the BIER domain, it is possible to send a packet from outside the
      BIER domain to multiple destination within the BIER domain.

I don't think it is necessary to describe in more details the many ways a unicast prefix can be made reachable from
a private or public part of the internet.

I'm afraid the situation is a bit more complicated.  The prefix is meant to be interpreted as a unicast prefix in certain contexts, but as a BIER prefix in other contexts.  The signaling and routing procedures need to ensure that the prefix will be interpreted, by each router to which it is propagated, in the context that is appropriate for that router.   There are a lot of non-obvious details needed to make this happen.



Also, don't forget to consider the case of hosts that are multi-homed to several BIER domains.

I don't think bier WG is exactly chartered to solve host multi-homing. ;-)

I don't see the relevance of that claim.  Many devices are multi-homed and BIER cannot assume that there is no multi-homing.  Of course, BIER doesn't have to solve multi-homing issues that are not related to BIER.



And the case of a host that is not directly connected to its BIER domain.  If the BIER prefix leads a packet (via unicast forwarding) from the host to a distant BFIR, how will that same prefix lead a packet (via unicast forwarding) from the distant BIER domain to the host?

I don't claim it does.

If the prefix is part of a unicast address of a host, it has to lead packets toward the host.  If the prefix identifies a BIER domain, it has to lead packets toward the BIER domain.  If the host isn't directly connected to the BIER domain, I don't see how this will work.  So there must be some restrictions on how these addresses and prefixes are assigned.  Perhaps these restrictions are included among the details that are" too obvious" to mention.  Of course, a lot of things seem obvious until you try to work out the details.



You have a companion draft describing the ISIS/OSPF/BGP extensions for doing the necessary signaling?

I don't think it should be any different from the documents related to the other encaps.
At least, I think those extensions should be agnostic.
If you see reasons or cases where they are not, I would be interested to know more.

I don't think any of the existing drafts on ISIS/OSPF/BGP signaling for BIER say how to associate IPv6 prefixes with BIER parameters.  Please don't say that the details are too obvious to mention!  Has any consideration even been given to the signaling that needs to exist in order to support this encapsulation?



When I first thought about this approach, I made an experimental implementation for Linux. I ended up not caring about these. I didn't even implemented the concept of S.I., but rather decided that every BIER prefix would use a different 'bit index to next-hop' mapping table. So, I would say that the set of BRF-ids is specific to a given prefix. I would even say we can remove the concept of domain and S.I. But that is the sort of things that I would need BIER experts to discuss with.
It seems like your "experimental implementation" does not comply with the BIER architecture.

It does. Because it implements the required features and behaves in a way that is in agreement with the BIER architecture draft.
I am just giving implementation feedback stating that, in this particular case, the implementation does not need to explicitly consider the notion of S.I. in order to be compliant.

An implementation that doesn't support SI is not compliant with the architecture.



Another "advantage" is that the proposal "may be used for transporting IP multicast packets, but also for sending IP payloads directly to multiple destinations".  Does this "advantage" distinguish it from some other proposal?  I'd have thought that any multicast encapsulation can cause any packet to sent to multiple destinations.
Only if the destination implements BIER. In this proposal, the destination does not need to decap anything. It directly receives a unicast packet.

In most BIER encapsulation proposals, the decapsulation is done by the BFER, not by the destination host.

Nothing prevents a BFER to be the destination of a packet though.
So I don't exactly see your point.

The point is that, for all encapsulations, decapsulation is done by the BFER, not by the destination.  So the fact that the destination doesn't have to do decapsulation does not distinguish one encapsulation from another.

You might be claiming, as an advantage, that BFERs don't always have to decapsulate and that BFIRs don't always have to encapsulate.  This is the old "nat vs. tunneling" rathole.  In the particular case of BIER,  there is a  set of problems caused by modifying the destination address field and by obscuring the distinction between multicast addresses and unicast addresses.  These seem to dominate any apparent advantage of not having to encapsulate. 


But if we do have another encapsulation, it shouldn't be IPv6-specific, and it shouldn't require hop-by-hop modification of the IP destination address field, and it shouldn't require the BFRs to inspect layer 4, and it shouldn't require changes to layer 4, and

it shouldn't allow a multicast address to be put in the IP source address field
Where did you see this ?!

This is the inevitable consequence of making it impossible for hosts or even routers to tell the difference between multicast addresses and unicast addresses. 


, and it shouldn't assume that bits never get set incorrectly,

Can I assume that the BIER BitString and the IP version number are set correctly ?

It is always necessary to understand the impact on the network of configurations that are imperfect.  Certainly one cannot assume that the router advertisement configuration files always have the flags set correctly.


and it shouldn't require changes in source address filtering procedures.  

It doesn't.

Of course it does, because certain prefixes that are advertised to the hosts are now going to be prohibited from appearing in the source address field. 


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aer-iport-1.cisco.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 20 Sep 2016 14:29:48 +0000 Received: from ams-iwijnand-8812.cisco.com (ams-iwijnand-8812.cisco.com [10.60.202.83]) by aer-core-1.cisco.com (8.14.5/8.14.5) with ESMTP id u8KETlv6023230 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Tue, 20 Sep 2016 14:29:48 GMT Content-Type: text/plain; charset=utf-8 Mime-Version: 1.0 (Mac OS X Mail 8.2 \(2104\)) From: IJsbrand Wijnands In-Reply-To: Date: Tue, 20 Sep 2016 16:29:47 +0200 Content-Transfer-Encoding: quoted-printable Message-Id: <1828FBD8-E44C-4DD6-8DEB-1A9766C6328E@cisco.com> References: <147280131368.24750.2582129788572723864.idtracker@ietfa.amsl.com> <3C470D17-363E-4F7D-B943-19FC52052C67@darou.fr> <10B5F14B-8A1B-4DFC-B21E-A314B1605213@darou.fr> <08b8ac29-459a-d5e5-524d-7b84d744b020@juniper.net> To: Eric C Rosen X-Mailer: Apple Mail (2.2104) Archived-At: Cc: bier@ietf.org, Pierre Pfister Subject: Re: [Bier] New Version Notification for draft-pfister-bier-over-ipv6-00.txt X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.17 Precedence: list List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 20 Sep 2016 14:44:38 -0000 Hi Eric, Many thanks for your comments. A few responses inline. > Sometimes an idea that seems clever at first just doesn't work out = when the details are examined. The idea of using addresses that are = unicast addresses in one context but multicast addresses in another = falls into this category. Inevitably a host will put a multicast = address into an IP source address field, because the host Maybe we can consider registering a new IPv6 address space for BIER. I = think a lot of your concerns would be addressed. That way we don=E2=80=99t= get in the way with already defined unicast behaviour and still leaves = it open to treat the packet as unicast in some specific cases, like with = tunnelling through non-BIER nodes. > Any BIER encapsulation needs to be able to support the features that = are in the architecture. =20 And we should not be afraid to allow exceptions and/or updates to the = architecture draft if necessary. > An implementation that doesn't support SI is not compliant with the = architecture. By allocating part of the =E2=80=9Cprefix=E2=80=9D for the SI/SD = identifier we can make this work just fine IMO. Since the SI/SD here is = manually defined and the BitString length is fixed, I think there is = really only need for one of them. If we call that SI or SD (or something = else) we can argue about :-) Thx, Ice. From nobody Tue Sep 20 13:37:14 2016 Return-Path: X-Original-To: bier@ietfa.amsl.com Delivered-To: bier@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 2D38512B500 for ; Tue, 20 Sep 2016 13:37:12 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.7 X-Spam-Level: X-Spam-Status: No, score=-2.7 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_LOW=-0.7, SPF_PASS=-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 9gxcQr4GOoaj for ; Tue, 20 Sep 2016 13:37:11 -0700 (PDT) Received: from mail-qt0-x236.google.com (mail-qt0-x236.google.com [IPv6:2607:f8b0:400d:c0d::236]) (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 7CF5512B061 for ; Tue, 20 Sep 2016 13:37:10 -0700 (PDT) Received: by mail-qt0-x236.google.com with SMTP id 38so13501964qte.1 for ; Tue, 20 Sep 2016 13:37:10 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:reply-to:from:date:message-id:subject:to; bh=2amfRsPDKxtWNT7FtIpvgvvmO8Qja+8ONvSthxmW0wA=; b=uki0IfLZc275KfHFqZTZRq+ZY1I9v4C2S1rF/F5Ii9+ANEZAVytl/0DPp14HemvVjv k8ddxfRAhhBZXC/IsDM++9McPe268kaXlvN+CSC4H9wTxb2oahdiTmslOpp5CpxvLZh/ NLN1KpKkJTB12HE/y5qbqBOTfYVgJi1ab4BlDswRsbBlkk7A/rJ7r69c1w8qEfF+yR8M 7rQWeW16obGFvzxe5hq/KTFPzOj/g1WpUxw1OBfBmjjglZ3SQrZ/xoeGG79K7L0sYKF8 JIJv+iHyk8YmHlkgj2na7KJEjgbAJMJuya5HrxpU2vf+fNDGOmO99UpXlFHpPLPlp2iR Fa6Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:reply-to:from:date:message-id :subject:to; bh=2amfRsPDKxtWNT7FtIpvgvvmO8Qja+8ONvSthxmW0wA=; b=EBE0V50pFo06XSwcHhOOjBf0PoeU3M9UmjX2UyvgETbwAMuOr6n+cuVuYWTgpzyJcH R7CHFBPViCJMyWrAyM7DZj/WqRL7sOmuORGQl6aTlO5mgHsjPjWBoEVlNaWfxs+MPbPu CsMMUxp8joGpwUKylpLi1aIqKkXxeQInL8WvBCLb1Udo9v4lJE01Wr0BaeoZwZDoY52g aNN5dd3+vyktVBmxnMPHy5uTCnIcDN9kOY7sd7ioOt7txRbheIYZ8AQgXZo3AYgc0rHr F/BRq8pIAhYfuKKGYxcBCeEpc/VauLr/jby2JDrkc8U/VnJyazZGxlurfw2fXm9OOHET jw8w== X-Gm-Message-State: AE9vXwO5lwtWpftDAD3Yw4wXA8b7qjqxz4TtEMFi9UAQ6x7qQw66aCTC7t5NfeNcSKWHrzopdIiJQTRo5wm3gg== X-Received: by 10.200.44.189 with SMTP id 58mr37807055qtw.109.1474403829597; Tue, 20 Sep 2016 13:37:09 -0700 (PDT) MIME-Version: 1.0 Received: by 10.200.52.17 with HTTP; Tue, 20 Sep 2016 13:37:08 -0700 (PDT) From: Greg Shepherd Date: Tue, 20 Sep 2016 13:37:08 -0700 Message-ID: To: "bier@ietf.org" Content-Type: text/plain; charset=UTF-8 Archived-At: Subject: [Bier] Change of Venue - Interim WG Meeting - encap design team X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.17 Precedence: list Reply-To: gjshep@gmail.com List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 20 Sep 2016 20:37:12 -0000 Same town, just moved it down the street to a neutral location. That way we won't need badging and escorts and people can come and go as they like. Embassy Suites Milpitas - Silicon Valley Seville/Valencia rm 901 E. Calaveras Boulevard, Milpitas, CA 95035 Cheers, Greg From nobody Tue Sep 20 15:17:14 2016 Return-Path: X-Original-To: bier@ietfa.amsl.com Delivered-To: bier@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 8DAA212B011 for ; Tue, 20 Sep 2016 15:17:12 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -4.215 X-Spam-Level: X-Spam-Status: No, score=-4.215 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.001, RP_MATCHES_RCVD=-2.316] 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 eEZQyMh5Lz3j for ; Tue, 20 Sep 2016 15:17:11 -0700 (PDT) Received: from faui40.informatik.uni-erlangen.de (faui40.informatik.uni-erlangen.de [IPv6:2001:638:a000:4134::ffff:40]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id C7E0612B00D for ; Tue, 20 Sep 2016 15:17:10 -0700 (PDT) Received: from faui40p.informatik.uni-erlangen.de (faui40p.informatik.uni-erlangen.de [IPv6:2001:638:a000:4134::ffff:77]) by faui40.informatik.uni-erlangen.de (Postfix) with ESMTP id 02A3358C4BD; Wed, 21 Sep 2016 00:17:09 +0200 (CEST) Received: by faui40p.informatik.uni-erlangen.de (Postfix, from userid 10463) id D96FCB0A8DB; Wed, 21 Sep 2016 00:17:08 +0200 (CEST) Date: Wed, 21 Sep 2016 00:17:08 +0200 From: Toerless Eckert To: Olufemi Komolafe Message-ID: <20160920221708.GA14130@faui40p.informatik.uni-erlangen.de> References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.21 (2010-09-15) Archived-At: Cc: "gjshep@gmail.com" , "bier@ietf.org" Subject: Re: [Bier] Alternate Encap Design Team - Call for volunteers X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.17 Precedence: list List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 20 Sep 2016 22:17:12 -0000 I would like to volunteer On Fri, Jul 29, 2016 at 12:47:30AM +0000, Olufemi Komolafe wrote: > I would like to volunteer. > > Regards, > Femi > > From: BIER [mailto:bier-bounces@ietf.org] On Behalf Of Rajiv Asati (rajiva) > Sent: Thursday, July 28, 2016 6:41 PM > To: gjshep@gmail.com > Cc: bier@ietf.org > Subject: Re: [Bier] Alternate Encap Design Team - Call for volunteers > > I would like to volunteer. > > Cheers, > Rajiv > > > On Jul 28, 2016, at 12:41 PM, Greg Shepherd > wrote: > *, > > Let me add, that if you DID NOT send email to this request, you are not on the current list for the Alt Encap Design team. The call for hands in the room was just to gauge interest. The official call is here on the list and you need to respond on the list or you will not be included. > > Thanks, > Greg > > On Thu, Jul 28, 2016 at 9:32 AM, Greg Shepherd > wrote: > Thank you to the 9 responders so far to the call. I'm going to start a date/location poll for the current list of volunteers. If others are interested in joining, the call is still open. Please send email to the chairs requesting to be added. > > Thanks!, > Greg > > On Wed, Jul 20, 2016 at 5:17 PM, Greg Shepherd > wrote: > *, > > Thank you to all who attended and contributed to the lively discussion at the WG meeting in Berlin this week. This is what WG meetings should be - and some would say, used to be. > > >From a poll in the room, there was consensus to pull together a volunteer design team to look at the various encap options, and based on use-case/operational considerations/support the team will pick one additional encap to document and offer as a WG item. The expectation is the list of volunteers will attend an interim WG meeting were we will work together for 2-3 days to hash out the direction and details. This will be a physical meeting, but will accommodate remote participation as well. > > I would like to see this work published and available for further discussion to the group at large on the list before and in the room during the next WG meeting in November. Considering the requirements for interim meeting announcements, the soonest we can reasonably target an interim meeting is Sept. > > Anyone wanting to volunteer as a member of the BIER Encap Design Team, please send email to the WG chairs. We will compile the list, then target a suitable location and dates from there. We look forward to pulling this enthusiastic team together in one direction. > > Thanks, > Greg > > > > > _______________________________________________ > BIER mailing list > BIER@ietf.org > https://www.ietf.org/mailman/listinfo/bier > _______________________________________________ > BIER mailing list > BIER@ietf.org > https://www.ietf.org/mailman/listinfo/bier -- --- Toerless.Eckert@informatik.uni-erlangen.de /C=de/A=d400/P=uni-erlangen/OU=informatik/S=Eckert/G=Toerless/ From nobody Tue Sep 20 16:22:06 2016 Return-Path: X-Original-To: bier@ietfa.amsl.com Delivered-To: bier@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 66D5712B308 for ; Tue, 20 Sep 2016 16:22:04 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -6.515 X-Spam-Level: X-Spam-Status: No, score=-6.515 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.001, RCVD_IN_DNSWL_MED=-2.3, RP_MATCHES_RCVD=-2.316] 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 sByprMd_yNlr for ; Tue, 20 Sep 2016 16:22:02 -0700 (PDT) Received: from faui40.informatik.uni-erlangen.de (faui40.informatik.uni-erlangen.de [131.188.34.40]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 04158126D74 for ; Tue, 20 Sep 2016 16:22:01 -0700 (PDT) Received: from faui40p.informatik.uni-erlangen.de (faui40p.informatik.uni-erlangen.de [131.188.34.77]) by faui40.informatik.uni-erlangen.de (Postfix) with ESMTP id 4F7C858C4BD for ; Wed, 21 Sep 2016 01:22:00 +0200 (CEST) Received: by faui40p.informatik.uni-erlangen.de (Postfix, from userid 10463) id 36379B0A8DC; Wed, 21 Sep 2016 01:22:00 +0200 (CEST) Date: Wed, 21 Sep 2016 01:22:00 +0200 From: Toerless Eckert To: "bier@ietf.org" Message-ID: <20160920232200.GB14130@faui40p.informatik.uni-erlangen.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.5.21 (2010-09-15) Archived-At: Subject: [Bier] Scope of alternate encap work / eg: draft-xu-bier-encapsulation X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.17 Precedence: list List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 20 Sep 2016 23:22:04 -0000 What is the scope of work for the alternative encap work ? Sorry if i missed a memo.. Some xample questions based on draft-xu-bier-encapsulation: 1. I want to use this encap "natively" over IP, aka: hop-by-hop replication. How do i set the fields of the IP header like source/dest address ? Which document would that ultimately be defined in ? 2. Now i want to use the encap over UDP because i want end-to-end BIER from my app, and apps can only do eg: UDP. So i really would like such an encap. Is this already out of scope as a use-case because end-to-end (host/app) BIER is not in charter scope ? 3. Lets assume some use case with UDP was in scope. What do we do about our best friend the UDP checksum on a BFR ? Pending on 1., the IP header may change. And bits in the bitstring will get reset. Force UDP checksum to 0 ? (given how payload will likely be UDP again). Shadow checksum in BIER header, ?... If questions like these are out of scope (subject for followup work how to apply common encap to FOO), then we run the risk of misdesigning a common header. 4. Can support for BIER-TE be in scope ? Would like a life-insurance bit: "BIER-TE" in header. I hope we can keep all BIER header fields with same semantic for BIER-TE, but if not, this bit would allow us to later on modify how specific fields operate under BIER-TE. 5. Tracing. In DetNet, the idea to use BIER-TE was brought up, and tracing of the packet path was given as key reason. With just resetting bits. Which doesn't help much to trace. Lets assume we have a "trace-bit" in the header. Only lower 50% of bitstring get allocated. Every time BFR resets bits in lower 50%, it sets same bits in upper 50%. Gives great tracing. Applicable to BIER and BIER-TE. Oh, and keeps UDP checksum of BIER header unchanged. Toerless On Wed, Jul 20, 2016 at 05:17:14PM -0700, Greg Shepherd wrote: > *, > > Thank you to all who attended and contributed to the lively discussion at > the WG meeting in Berlin this week. This is what WG meetings should be - > and some would say, used to be. > > >From a poll in the room, there was consensus to pull together a volunteer > design team to look at the various encap options, and based on > use-case/operational considerations/support the team will pick one > additional encap to document and offer as a WG item. The expectation is the > list of volunteers will attend an interim WG meeting were we will work > together for 2-3 days to hash out the direction and details. This will be a > physical meeting, but will accommodate remote participation as well. > > I would like to see this work published and available for further > discussion to the group at large on the list before and in the room during > the next WG meeting in November. Considering the requirements for interim > meeting announcements, the soonest we can reasonably target an interim > meeting is Sept. > > Anyone wanting to volunteer as a member of the BIER Encap Design Team, > please send email to the WG chairs. We will compile the list, then target a > suitable location and dates from there. We look forward to pulling this > enthusiastic team together in one direction. > > Thanks, > Greg > _______________________________________________ > BIER mailing list > BIER@ietf.org > https://www.ietf.org/mailman/listinfo/bier -- --- Toerless.Eckert@informatik.uni-erlangen.de /C=de/A=d400/P=uni-erlangen/OU=informatik/S=Eckert/G=Toerless/ From nobody Wed Sep 21 02:57:19 2016 Return-Path: X-Original-To: bier@ietfa.amsl.com Delivered-To: bier@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 3DEDB12B1B4 for ; Wed, 21 Sep 2016 02:57:18 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -6.537 X-Spam-Level: X-Spam-Status: No, score=-6.537 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, RP_MATCHES_RCVD=-2.316, 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 uRdd_jthKjcO for ; Wed, 21 Sep 2016 02:57:14 -0700 (PDT) Received: from lhrrgout.huawei.com (lhrrgout.huawei.com [194.213.3.17]) (using TLSv1 with cipher RC4-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id DD1AA12B1B1 for ; Wed, 21 Sep 2016 02:57:13 -0700 (PDT) Received: from 172.18.7.190 (EHLO lhreml707-cah.china.huawei.com) ([172.18.7.190]) by lhrrg02-dlp.huawei.com (MOS 4.3.7-GA FastPath queued) with ESMTP id CRQ08619; Wed, 21 Sep 2016 09:57:10 +0000 (GMT) Received: from NKGEML413-HUB.china.huawei.com (10.98.56.74) by lhreml707-cah.china.huawei.com (10.201.5.199) with Microsoft SMTP Server (TLS) id 14.3.235.1; Wed, 21 Sep 2016 10:57:09 +0100 Received: from NKGEML515-MBX.china.huawei.com ([fe80::a54a:89d2:c471:ff]) by NKGEML413-HUB.china.huawei.com ([10.98.56.74]) with mapi id 14.03.0235.001; Wed, 21 Sep 2016 17:57:06 +0800 From: Xuxiaohu To: Toerless Eckert , "bier@ietf.org" Thread-Topic: [Bier] Scope of alternate encap work / eg: draft-xu-bier-encapsulation Thread-Index: AQHSE5XTixvwVXppAEyvdBPqS6LW7KCDqWhA Date: Wed, 21 Sep 2016 09:57:06 +0000 Message-ID: <1FEE3F8F5CCDE64C9A8E8F4AD27C19EE2BB1D0EA@NKGEML515-MBX.china.huawei.com> References: <20160920232200.GB14130@faui40p.informatik.uni-erlangen.de> In-Reply-To: <20160920232200.GB14130@faui40p.informatik.uni-erlangen.de> Accept-Language: zh-CN, en-US Content-Language: zh-CN X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.111.184.181] Content-Type: text/plain; charset="gb2312" Content-Transfer-Encoding: base64 MIME-Version: 1.0 X-CFilter-Loop: Reflected X-Mirapoint-Virus-RAPID-Raw: score=unknown(0), refid=str=0001.0A0B0208.57E25976.01DA, ss=1, re=0.000, recu=0.000, reip=0.000, cl=1, cld=1, fgs=0, ip=0.0.0.0, so=2013-06-18 04:22:30, dmn=2013-03-21 17:37:32 X-Mirapoint-Loop-Id: 131f6d38ebfc307a72828b47cf49eed9 Archived-At: Subject: Re: [Bier] Scope of alternate encap work / eg: draft-xu-bier-encapsulation X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.17 Precedence: list List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 21 Sep 2016 09:57:18 -0000 SGkgVG9lcmxlc3MsDQoNCi0tLS0t08q8/tStvP4tLS0tLQ0Kt6K8/sjLOiBCSUVSIFttYWlsdG86 Ymllci1ib3VuY2VzQGlldGYub3JnXSC0+rHtIFRvZXJsZXNzIEVja2VydA0Kt6LLzcqxvOQ6IDIw MTbE6jnUwjIxyNUgNzoyMg0KytW8/sjLOiBiaWVyQGlldGYub3JnDQrW98ziOiBbQmllcl0gU2Nv cGUgb2YgYWx0ZXJuYXRlIGVuY2FwIHdvcmsgLyBlZzogZHJhZnQteHUtYmllci1lbmNhcHN1bGF0 aW9uDQoNCldoYXQgaXMgdGhlIHNjb3BlIG9mIHdvcmsgZm9yIHRoZSBhbHRlcm5hdGl2ZSBlbmNh cCB3b3JrID8gU29ycnkgaWYgaSBtaXNzZWQgYSBtZW1vLi4NCg0KU29tZSB4YW1wbGUgcXVlc3Rp b25zIGJhc2VkIG9uIGRyYWZ0LXh1LWJpZXItZW5jYXBzdWxhdGlvbjoNCg0KMS4gSSB3YW50IHRv IHVzZSB0aGlzIGVuY2FwICJuYXRpdmVseSIgb3ZlciBJUCwgYWthOiBob3AtYnktaG9wIHJlcGxp Y2F0aW9uLg0KICAgSG93IGRvIGkgc2V0IHRoZSBmaWVsZHMgb2YgdGhlIElQIGhlYWRlciBsaWtl 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LA0KPiBHcmVnDQoNCj4gX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fX18NCj4gQklFUiBtYWlsaW5nIGxpc3QNCj4gQklFUkBpZXRmLm9yZw0KPiBodHRwczovL3d3 dy5pZXRmLm9yZy9tYWlsbWFuL2xpc3RpbmZvL2JpZXINCg0KDQotLQ0KLS0tDQpUb2VybGVzcy5F Y2tlcnRAaW5mb3JtYXRpay51bmktZXJsYW5nZW4uZGUNCi9DPWRlL0E9ZDQwMC9QPXVuaS1lcmxh bmdlbi9PVT1pbmZvcm1hdGlrL1M9RWNrZXJ0L0c9VG9lcmxlc3MvDQoNCl9fX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fDQpCSUVSIG1haWxpbmcgbGlzdA0KQklF UkBpZXRmLm9yZw0KaHR0cHM6Ly93d3cuaWV0Zi5vcmcvbWFpbG1hbi9saXN0aW5mby9iaWVyDQo= From nobody Wed Sep 21 03:09:36 2016 Return-Path: X-Original-To: bier@ietfa.amsl.com Delivered-To: bier@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 4348412B1DE for ; Wed, 21 Sep 2016 03:09:34 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -6.537 X-Spam-Level: X-Spam-Status: No, score=-6.537 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, 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text/plain; charset="utf-8" Content-Transfer-Encoding: base64 MIME-Version: 1.0 X-CFilter-Loop: Reflected X-Mirapoint-Virus-RAPID-Raw: score=unknown(0), refid=str=0001.0A0B0208.57E25C58.0071, ss=1, re=0.000, recu=0.000, reip=0.000, cl=1, cld=1, fgs=0, ip=0.0.0.0, so=2013-06-18 04:22:30, dmn=2013-03-21 17:37:32 X-Mirapoint-Loop-Id: 0988aa0c8b7e1d14b34907a033290fb1 Archived-At: Cc: "bier@ietf.org" , Pierre Pfister Subject: [Bier] =?utf-8?b?562U5aSNOiAgTmV3IFZlcnNpb24gTm90aWZpY2F0aW9uIGZv?= =?utf-8?q?r_draft-pfister-bier-over-ipv6-00=2Etxt?= X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.17 Precedence: list List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 21 Sep 2016 10:09:34 -0000 SGkgSWNlLA0KDQpJZiBJIHVuZGVyc3RhbmQgeW91ciBkcmFmdCBjb3JyZWN0bHksIGl0IHRhbGtz IGFib3V0IGVtYmVkZGluZyBCSUVSIHdpdGhpbiBJUHY2IHJhdGhlciB0aGFuIHRyYW5zcG9ydGlu 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(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 86CAE12B1F0 for ; Wed, 21 Sep 2016 03:27:45 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=3117; q=dns/txt; s=iport; t=1474453665; x=1475663265; h=mime-version:subject:from:in-reply-to:date:cc: content-transfer-encoding:message-id:references:to; bh=fKL/rciNwn9gCXbWRrdvfM3RyLDhAcErWsmSTPhnuS0=; b=QzcKYdqlk0zux3s7xjkck//9VF5lp19ZKIdOYtnK1bFaMsvfQAZpqaMd gjZ0bnhvEgjddU44N+kuq7D97QoxRjbK18/1bhxa00ZAS9ISY9ofEVWBX dP8zwMJwuYtOCXJG16lLVOCpTvkOhFqGdeyRzKdjjsJ9OLbWKPPQmxUev Q=; X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: =?us-ascii?q?A0BXAQAlX+JX/xbLJq1eGgEBAQECAQEBA?= =?us-ascii?q?QgBAQEBgzsBAQEBAXV8jTOWCAEBBpU0ggQZC4V2AgICgh0UAQIBAQEBAQEBXie?= =?us-ascii?q?EYQEBAQMBAQEBIEsJAgULCQISBgICIwMCAicfAw4GE4hDCA6RIJ0mjFkBAQEBA?= 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<3C470D17-363E-4F7D-B943-19FC52052C67@darou.fr> <10B5F14B-8A1B-4DFC-B21E-A314B1605213@darou.fr> <08b8ac29-459a-d5e5-524d-7b84d744b020@juniper.net> <1828FBD8-E44C-4DD6-8DEB-1A9766C6328E@cisco.com> <1FEE3F8F5CCDE64C9A8E8F4AD27C19EE2BB1D115@NKGEML515-MBX.china.huawei.com> To: Xuxiaohu X-Mailer: Apple Mail (2.2104) Archived-At: Cc: "bier@ietf.org" , Pierre Pfister , Eric C Rosen Subject: Re: [Bier] New Version Notification for draft-pfister-bier-over-ipv6-00.txt X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.17 Precedence: list List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 21 Sep 2016 10:27:48 -0000 Hi Xiaohu, I would say that one of the big benefits is that an IPv6 BIER encoded = packet can be translated/transformed into a set of IPv6 Unicast packets = (just one bit set) at the egress of the network very easily. This is = very beneficial when running BIER between servers and avoids the need = for MLD and DR/DF election between the Server and the router. Thx, Ice. > On 21 Sep 2016, at 12:09, Xuxiaohu wrote: >=20 > Hi Ice, >=20 > If I understand your draft correctly, it talks about embedding BIER = within IPv6 rather than transporting BIER over IP. The beauty of this = approach is that all information needed for BIER forwarding is now = directly contained in the received BIER packet. As a result, there is no = need to retrieve them from the MPLS-BIER label and distribute the = MPLS-BIER label mappings. However, what's the major advantage over the = generic BIER header as defined in = https://tools.ietf.org/html/draft-xu-bier-encapsulation-05 from your = point of view? >=20 > Best regards, > Xiaohu >=20 > -----=E9=82=AE=E4=BB=B6=E5=8E=9F=E4=BB=B6----- > =E5=8F=91=E4=BB=B6=E4=BA=BA: BIER [mailto:bier-bounces@ietf.org] = =E4=BB=A3=E8=A1=A8 IJsbrand Wijnands > =E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2016=E5=B9=B49=E6=9C=8820=E6=97=A5= 22:30 > =E6=94=B6=E4=BB=B6=E4=BA=BA: Eric C Rosen > =E6=8A=84=E9=80=81: bier@ietf.org; Pierre Pfister > =E4=B8=BB=E9=A2=98: Re: [Bier] New Version Notification for = draft-pfister-bier-over-ipv6-00.txt >=20 > Hi Eric, >=20 > Many thanks for your comments. A few responses inline. >=20 >> Sometimes an idea that seems clever at first just doesn't work out = when the details are examined. The idea of using addresses that are = unicast addresses in one context but multicast addresses in another = falls into this category. Inevitably a host will put a multicast = address into an IP source address field, because the host >=20 > Maybe we can consider registering a new IPv6 address space for BIER. I = think a lot of your concerns would be addressed. That way we don=E2=80=99t= get in the way with already defined unicast behaviour and still leaves = it open to treat the packet as unicast in some specific cases, like with = tunnelling through non-BIER nodes. >=20 >> Any BIER encapsulation needs to be able to support the features that = are in the architecture. =20 >=20 > And we should not be afraid to allow exceptions and/or updates to the = architecture draft if necessary. >=20 >> An implementation that doesn't support SI is not compliant with the = architecture. >=20 > By allocating part of the =E2=80=9Cprefix=E2=80=9D for the SI/SD = identifier we can make this work just fine IMO. Since the SI/SD here is = manually defined and the BitString length is fixed, I think there is = really only need for one of them. If we call that SI or SD (or something = else) we can argue about :-) >=20 > Thx, >=20 > Ice. >=20 > _______________________________________________ > BIER mailing list > BIER@ietf.org > https://www.ietf.org/mailman/listinfo/bier From nobody Wed Sep 21 18:48:53 2016 Return-Path: X-Original-To: bier@ietfa.amsl.com Delivered-To: bier@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 7E05F12BA74 for ; Wed, 21 Sep 2016 18:48:51 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -6.537 X-Spam-Level: X-Spam-Status: No, score=-6.537 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, RP_MATCHES_RCVD=-2.316, 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 Q2M2GHTVYYs5 for ; Wed, 21 Sep 2016 18:48:49 -0700 (PDT) Received: from lhrrgout.huawei.com (lhrrgout.huawei.com [194.213.3.17]) (using TLSv1 with cipher RC4-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id E0B0912B953 for ; Wed, 21 Sep 2016 18:48:47 -0700 (PDT) Received: from 172.18.7.190 (EHLO lhreml708-cah.china.huawei.com) ([172.18.7.190]) by lhrrg01-dlp.huawei.com (MOS 4.3.7-GA FastPath queued) with ESMTP id CWR67391; Thu, 22 Sep 2016 01:48:45 +0000 (GMT) Received: from NKGEML412-HUB.china.huawei.com (10.98.56.73) by lhreml708-cah.china.huawei.com (10.201.5.202) with Microsoft SMTP Server (TLS) id 14.3.235.1; Thu, 22 Sep 2016 02:48:44 +0100 Received: from NKGEML515-MBX.china.huawei.com ([fe80::a54a:89d2:c471:ff]) by nkgeml412-hub.china.huawei.com ([10.98.56.73]) with mapi id 14.03.0235.001; Thu, 22 Sep 2016 09:48:34 +0800 From: Xuxiaohu To: IJsbrand Wijnands Thread-Topic: [Bier] New Version Notification for draft-pfister-bier-over-ipv6-00.txt Thread-Index: AQHSDSzcT1rdLwivXki3NVB4wJNcPKB2lE0AgAOTggCAACUMAIAGVoeAgAFTCICAAc6lEP//gAwAgAGE1KA= Date: Thu, 22 Sep 2016 01:48:33 +0000 Message-ID: <1FEE3F8F5CCDE64C9A8E8F4AD27C19EE2BB1D5CA@NKGEML515-MBX.china.huawei.com> References: <147280131368.24750.2582129788572723864.idtracker@ietfa.amsl.com> <3C470D17-363E-4F7D-B943-19FC52052C67@darou.fr> <10B5F14B-8A1B-4DFC-B21E-A314B1605213@darou.fr> <08b8ac29-459a-d5e5-524d-7b84d744b020@juniper.net> <1828FBD8-E44C-4DD6-8DEB-1A9766C6328E@cisco.com> <1FEE3F8F5CCDE64C9A8E8F4AD27C19EE2BB1D115@NKGEML515-MBX.china.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: [10.111.184.181] Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 MIME-Version: 1.0 X-CFilter-Loop: Reflected X-Mirapoint-Virus-RAPID-Raw: score=unknown(0), refid=str=0001.0A020202.57E3387E.0096, ss=1, re=0.000, recu=0.000, reip=0.000, cl=1, cld=1, fgs=0, ip=0.0.0.0, so=2013-06-18 04:22:30, dmn=2013-03-21 17:37:32 X-Mirapoint-Loop-Id: 0988aa0c8b7e1d14b34907a033290fb1 Archived-At: Cc: "bier@ietf.org" , Pierre Pfister , Eric C Rosen Subject: [Bier] =?utf-8?b?562U5aSNOiAgTmV3IFZlcnNpb24gTm90aWZpY2F0aW9uIGZv?= =?utf-8?q?r_draft-pfister-bier-over-ipv6-00=2Etxt?= X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.17 Precedence: list List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 22 Sep 2016 01:48:51 -0000 SGkgSWNlLA0KDQpDb3VsZCB5b3UgcGxlYXNlIGlsbHVzdHJhdGUgaG93IHRvIHRyYW5zbGF0ZS90 cmFuc2Zvcm0gYW4gSVB2Ni1CSUVSIHBhY2tldCBpbnRvIGEgc2V0IG9mIElQdjYgdW5pY2FzdCBw YWNrZXRzIGJ5IHNldHRpbmcgb25seSBvbmUgYml0PyBCVFcsIHdoYXQncyB0aGUgcGF5bG9hZCBv ZiB0aGUgSVB2Ni1CSUVSIHBhY2tldCBpbiB5b3VyIGV4YW1wbGU/IEluIG90aGVyIHdvcmRzLCB3 aGF0J3MgdGhlIHZhbHVlIG9mIHRoZSBOZXh0LUhlYWRlciBmaWVsZCBvZiB0aGUgSVB2Ni1CSUVS IGhlYWRlcj8NCiANCkJlc3QgcmVnYXJkcywNClhpYW9odQ0KDQotLS0tLemCruS7tuWOn+S7ti0t 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PiBfX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fXw0KPiBCSUVS IG1haWxpbmcgbGlzdA0KPiBCSUVSQGlldGYub3JnDQo+IGh0dHBzOi8vd3d3LmlldGYub3JnL21h aWxtYW4vbGlzdGluZm8vYmllcg0KDQo= From nobody Wed Sep 21 20:19:03 2016 Return-Path: X-Original-To: bier@ietfa.amsl.com Delivered-To: bier@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 7DEC012BBD2 for ; Wed, 21 Sep 2016 20:19:02 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -6.537 X-Spam-Level: X-Spam-Status: No, score=-6.537 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, RP_MATCHES_RCVD=-2.316, 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 e2fWE82k8-p4 for ; Wed, 21 Sep 2016 20:18:57 -0700 (PDT) Received: from lhrrgout.huawei.com (lhrrgout.huawei.com [194.213.3.17]) (using TLSv1 with cipher RC4-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 41E4F12BA5D for ; Wed, 21 Sep 2016 20:18:56 -0700 (PDT) Received: from 172.18.7.190 (EHLO lhreml701-cah.china.huawei.com) ([172.18.7.190]) by lhrrg02-dlp.huawei.com (MOS 4.3.7-GA FastPath queued) with ESMTP id CRR18412; Thu, 22 Sep 2016 03:18:53 +0000 (GMT) Received: from NKGEML412-HUB.china.huawei.com (10.98.56.73) by lhreml701-cah.china.huawei.com (10.201.5.93) with Microsoft SMTP Server (TLS) id 14.3.235.1; Thu, 22 Sep 2016 04:15:56 +0100 Received: from NKGEML515-MBX.china.huawei.com ([fe80::a54a:89d2:c471:ff]) by nkgeml412-hub.china.huawei.com ([10.98.56.73]) with mapi id 14.03.0235.001; Thu, 22 Sep 2016 11:15:51 +0800 From: Xuxiaohu To: Toerless Eckert Thread-Topic: [Bier] Scope of alternate encap work / eg: draft-xu-bier-encapsulation Thread-Index: AQHSFD32Ard576PQgUyU0VAzNcug+aCEzuug Date: Thu, 22 Sep 2016 03:15:51 +0000 Message-ID: <1FEE3F8F5CCDE64C9A8E8F4AD27C19EE2BB1D61B@NKGEML515-MBX.china.huawei.com> References: <20160920232200.GB14130@faui40p.informatik.uni-erlangen.de> <1FEE3F8F5CCDE64C9A8E8F4AD27C19EE2BB1D0EA@NKGEML515-MBX.china.huawei.com> <20160921192539.GA29177@faui40p.informatik.uni-erlangen.de> In-Reply-To: <20160921192539.GA29177@faui40p.informatik.uni-erlangen.de> Accept-Language: zh-CN, en-US Content-Language: zh-CN X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.111.184.181] Content-Type: text/plain; charset="gb2312" Content-Transfer-Encoding: base64 MIME-Version: 1.0 X-CFilter-Loop: Reflected X-Mirapoint-Virus-RAPID-Raw: score=unknown(0), refid=str=0001.0A0B0202.57E34D9E.003A, ss=1, re=0.000, recu=0.000, reip=0.000, cl=1, cld=1, fgs=0, ip=0.0.0.0, so=2013-06-18 04:22:30, dmn=2013-03-21 17:37:32 X-Mirapoint-Loop-Id: 775cf5d455d92997ac5efaed7ab62cb4 Archived-At: Cc: Toerless Eckert , "bier@ietf.org" Subject: [Bier] 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([172.18.7.190]) by lhrrg02-dlp.huawei.com (MOS 4.3.7-GA FastPath queued) with ESMTP id CRR22767; Thu, 22 Sep 2016 04:07:39 +0000 (GMT) Received: from NKGEML413-HUB.china.huawei.com (10.98.56.74) by lhreml705-cah.china.huawei.com (10.201.5.168) with Microsoft SMTP Server (TLS) id 14.3.235.1; Thu, 22 Sep 2016 05:07:38 +0100 Received: from NKGEML515-MBX.china.huawei.com ([fe80::a54a:89d2:c471:ff]) by NKGEML413-HUB.china.huawei.com ([10.98.56.74]) with mapi id 14.03.0235.001; Thu, 22 Sep 2016 12:07:19 +0800 From: Xuxiaohu To: Xuxiaohu , IJsbrand Wijnands Thread-Topic: =?utf-8?B?W0JpZXJdIOetlOWkjTogIE5ldyBWZXJzaW9uIE5vdGlmaWNhdGlvbiBmb3Ig?= =?utf-8?Q?draft-pfister-bier-over-ipv6-00.txt?= Thread-Index: AQHSFIbPi1SpAFJoiUyXtg4Nt6bahA== Date: Thu, 22 Sep 2016 04:07:19 +0000 Message-ID: <1FEE3F8F5CCDE64C9A8E8F4AD27C19EE2BB1D653@NKGEML515-MBX.china.huawei.com> References: <147280131368.24750.2582129788572723864.idtracker@ietfa.amsl.com> <3C470D17-363E-4F7D-B943-19FC52052C67@darou.fr> <10B5F14B-8A1B-4DFC-B21E-A314B1605213@darou.fr> <08b8ac29-459a-d5e5-524d-7b84d744b020@juniper.net> <1828FBD8-E44C-4DD6-8DEB-1A9766C6328E@cisco.com> <1FEE3F8F5CCDE64C9A8E8F4AD27C19EE2BB1D115@NKGEML515-MBX.china.huawei.com> <1FEE3F8F5CCDE64C9A8E8F4AD27C19EE2BB1D5CA@NKGEML515-MBX.china.huawei.com> In-Reply-To: <1FEE3F8F5CCDE64C9A8E8F4AD27C19EE2BB1D5CA@NKGEML515-MBX.china.huawei.com> Accept-Language: zh-CN, en-US Content-Language: zh-CN X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.111.184.181] Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 MIME-Version: 1.0 X-CFilter-Loop: Reflected X-Mirapoint-Virus-RAPID-Raw: score=unknown(0), refid=str=0001.0A020203.57E3590C.00AF, ss=1, re=0.000, recu=0.000, reip=0.000, cl=1, cld=1, fgs=0, ip=0.0.0.0, so=2013-06-18 04:22:30, dmn=2013-03-21 17:37:32 X-Mirapoint-Loop-Id: 45eef1b928a2b470f18311fbeb56be71 Archived-At: Cc: "bier@ietf.org" , Pierre Pfister , Eric C Rosen Subject: [Bier] 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dGYub3JnDQpodHRwczovL3d3dy5pZXRmLm9yZy9tYWlsbWFuL2xpc3RpbmZvL2JpZXINCg== From nobody Wed Sep 21 23:52:15 2016 Return-Path: X-Original-To: bier@ietfa.amsl.com Delivered-To: bier@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id D73DB12BA95 for ; Wed, 21 Sep 2016 23:52:13 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -5.029 X-Spam-Level: X-Spam-Status: No, score=-5.029 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, FAKE_REPLY_C=1.486, HEADER_FROM_DIFFERENT_DOMAINS=0.001, RCVD_IN_DNSWL_MED=-2.3, RP_MATCHES_RCVD=-2.316] 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 lUtYDy-1ul96 for ; Wed, 21 Sep 2016 23:52:12 -0700 (PDT) Received: from faui40.informatik.uni-erlangen.de (faui40.informatik.uni-erlangen.de [131.188.34.40]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 6483812BA81 for ; Wed, 21 Sep 2016 23:52:12 -0700 (PDT) Received: from faui40p.informatik.uni-erlangen.de (faui40p.informatik.uni-erlangen.de [IPv6:2001:638:a000:4134::ffff:77]) by faui40.informatik.uni-erlangen.de (Postfix) with ESMTP id 20E5C58C4D0; Thu, 22 Sep 2016 08:52:11 +0200 (CEST) Received: by faui40p.informatik.uni-erlangen.de (Postfix, from userid 10463) id F3C0DB0A8F4; Thu, 22 Sep 2016 08:52:10 +0200 (CEST) Date: Thu, 22 Sep 2016 08:52:10 +0200 From: Toerless Eckert To: Xuxiaohu Message-ID: <20160922065210.GA24560@faui40p.informatik.uni-erlangen.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.5.21 (2010-09-15) Archived-At: Cc: "bier@ietf.org" Subject: Re: [Bier] ????: Scope of alternate encap work / eg: draft-xu-bier-encapsulation X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.17 Precedence: list List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 22 Sep 2016 06:52:14 -0000 On Thu, Sep 22, 2016 at 03:15:51AM +0000, Xuxiaohu wrote: > [Xiaohu2] IMHO, the BIER layer is another network layer. Hence it seems unnecessary to add one more network layer header (i.e., IPv6 header). Whether or not IPv6 would be used in the IoT world is a uncertainty:) Hence it seems too early to take the IoT stuff into account when designing a transport-independent BIER header. Of course, you firmly believe that IoT is a valid use case for BIER, it'd better to proposal some text to the BIER use case draft or write another IoT-specific use case draft. No strong opinions from my side, just personal preferences, but i was mostly trying to figure out what you thought to be important. The statement that your encap considers BIER as a "full" network layer comparable to IP should also go into the document. And that encaps into eg: IP or other network layers are just "tunnel" cases - which would not justify to strip fields from your proposed BIER header. It's a main difference over the MPLS BIER header, so it's good to write down the reasoning. Maybe even call the encap proposal IP-BIER or the like. In comparison, if you wanted BIER encap across an L2 network, eg: for L2-switches, you would not have TTL (STP takes care of loops), you wouldn't have IP like DS, and you'd have some L2-next-proto fields instead of the value from the IP header. IPA-Bier ? ;-)) (IP Alternative BIER). > There should be some good text why the TTL field is necessary > - It is not necessary for loop prevention within the BIER domain, BIER does > that well by itself. > - TTL scoping is disliked. > - The payload itself wuld also have a TTL field if it needs one. > - What good reason am i missing ? > > [Xiaohu2] Assume that only one bit of the Bitstring is set, it's equivalent to the usage of a unicast IP tunnel. Do you need a TTL field within an IP tunnel? I think i was confused. In BIER-TE there is loop prevention by BIER-TE itself, not relying on other header fields. If i now remember it correctly, in BIER, packets can loop if there is an IGP loop, so TTL should be fine/necessary. Cheers Toerless > > [Xiaohu] See the above. > > If you want UDP inside your encap to be out of scope, please write that up, see suggested text above. > > [Xiaohu2] Sure, thanks again for your suggested text. > > Best regards, > Xiaohu > > Cheers > Toerless > > > Best regards, > > Xiaohu > > > > 4. Can support for BIER-TE be in scope ? Would like a life-insurance bit: > > "BIER-TE" in header. I hope we can keep all BIER header fields with same > > semantic for BIER-TE, but if not, this bit would allow us to later on > > modify how specific fields operate under BIER-TE. > > > > > > 5. Tracing. In DetNet, the idea to use BIER-TE was brought up, and tracing of > > the packet path was given as key reason. With just resetting bits. Which doesn't > > help much to trace. Lets assume we have a "trace-bit" in the header. Only > > lower 50% of bitstring get allocated. Every time BFR resets bits in lower > > 50%, it sets same bits in upper 50%. Gives great tracing. Applicable to BIER > > and BIER-TE. Oh, and keeps UDP checksum of BIER header unchanged. > > > > Toerless > > > > On Wed, Jul 20, 2016 at 05:17:14PM -0700, Greg Shepherd wrote: > > > *, > > > > > > Thank you to all who attended and contributed to the lively > > > discussion at the WG meeting in Berlin this week. This is what WG > > > meetings should be - and some would say, used to be. > > > > > > >From a poll in the room, there was consensus to pull together a > > > >volunteer > > > design team to look at the various encap options, and based on > > > use-case/operational considerations/support the team will pick one > > > additional encap to document and offer as a WG item. The expectation > > > is the list of volunteers will attend an interim WG meeting were we > > > will work together for 2-3 days to hash out the direction and details. > > > This will be a physical meeting, but will accommodate remote participation as well. > > > > > > I would like to see this work published and available for further > > > discussion to the group at large on the list before and in the room > > > during the next WG meeting in November. Considering the requirements > > > for interim meeting announcements, the soonest we can reasonably > > > target an interim meeting is Sept. > > > > > > Anyone wanting to volunteer as a member of the BIER Encap Design > > > Team, please send email to the WG chairs. We will compile the list, > > > then target a suitable location and dates from there. We look > > > forward to pulling this enthusiastic team together in one direction. > > > > > > Thanks, > > > Greg From nobody Wed Sep 21 23:55:46 2016 Return-Path: X-Original-To: bier@ietfa.amsl.com Delivered-To: bier@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 9645A12B9B8 for ; Wed, 21 Sep 2016 23:55:43 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -5.029 X-Spam-Level: X-Spam-Status: No, score=-5.029 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, FAKE_REPLY_C=1.486, HEADER_FROM_DIFFERENT_DOMAINS=0.001, RCVD_IN_DNSWL_MED=-2.3, RP_MATCHES_RCVD=-2.316] 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 5t1mrPrAvxTt for ; Wed, 21 Sep 2016 23:55:42 -0700 (PDT) Received: from faui40.informatik.uni-erlangen.de (faui40.informatik.uni-erlangen.de [131.188.34.40]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id D049112B9A6 for ; Wed, 21 Sep 2016 23:55:41 -0700 (PDT) Received: from faui40p.informatik.uni-erlangen.de (faui40p.informatik.uni-erlangen.de [IPv6:2001:638:a000:4134::ffff:77]) by faui40.informatik.uni-erlangen.de (Postfix) with ESMTP id 9534858C4D0; Thu, 22 Sep 2016 08:55:40 +0200 (CEST) Received: by faui40p.informatik.uni-erlangen.de (Postfix, from userid 10463) id 7C21AB0A8F4; Thu, 22 Sep 2016 08:55:40 +0200 (CEST) Date: Thu, 22 Sep 2016 08:55:40 +0200 From: Toerless Eckert To: IJsbrand Wijnands Message-ID: <20160922065540.GB24560@faui40p.informatik.uni-erlangen.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.5.21 (2010-09-15) Archived-At: Cc: Xuxiaohu , "bier@ietf.org" , Pierre Pfister , Eric C Rosen Subject: Re: [Bier] New Version Notification for draft-pfister-bier-over-ipv6-00.txt X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.17 Precedence: list List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 22 Sep 2016 06:55:43 -0000 On Wed, Sep 21, 2016 at 12:27:42PM +0200, IJsbrand Wijnands wrote: > Hi Xiaohu, > > I would say that one of the big benefits is that an IPv6 BIER encoded packet can be translated/transformed into a set of IPv6 Unicast packets (just one bit set) at the egress of the network very easily. This is very beneficial when running BIER between servers and avoids the need for MLD and DR/DF election between the Server and the router. Is this the example pitch: ? |-- Rcv1 --- BFER1 --| / |-- Rcv2 Src ---- Rtr --- BFIR \ |-- Rcv3 --- BFER2 --| |-- Rcv4 | |-- Rtr2 ---- Rcv5 Src sends one IPv6 unicast packet indicating (Rcv1,Rcv3,Rcv4). It will have a prefix owned by BFIR. There it will be replicated by BIER. Copies arriving at BFER1,BFER2 will be converted back to IP unicast packets, one copy to Rcv2 from BFER1, one from BFER2 to Rcv3, one from BFER2 to Rcv4. I like the value proposition, but i thought that this end-to-end BIER mode was still out of charter scope ? (would be great if that was not true anymore). How about supporting remote receivers like Rcv5 ? Sources can be remote so it would make sense to allow bidirectional support. Might need some signaling to BFER2 to map a remote IP address to a bit. Cheers toerless > > Thx, > > Ice. > > > On 21 Sep 2016, at 12:09, Xuxiaohu wrote: > > > > Hi Ice, > > > > If I understand your draft correctly, it talks about embedding BIER within IPv6 rather than transporting BIER over IP. The beauty of this approach is that all information needed for BIER forwarding is now directly contained in the received BIER packet. As a result, there is no need to retrieve them from the MPLS-BIER label and distribute the MPLS-BIER label mappings. However, what's the major advantage over the generic BIER header as defined in https://tools.ietf.org/html/draft-xu-bier-encapsulation-05 from your point of view? > > > > Best regards, > > Xiaohu > > > > -----????????????----- > > ?????????: BIER [mailto:bier-bounces@ietf.org] ?????? IJsbrand Wijnands > > ????????????: 2016???9???20??? 22:30 > > ?????????: Eric C Rosen > > ??????: bier@ietf.org; Pierre Pfister > > ??????: Re: [Bier] New Version Notification for draft-pfister-bier-over-ipv6-00.txt > > > > Hi Eric, > > > > Many thanks for your comments. A few responses inline. > > > >> Sometimes an idea that seems clever at first just doesn't work out when the details are examined. The idea of using addresses that are unicast addresses in one context but multicast addresses in another falls into this category. Inevitably a host will put a multicast address into an IP source address field, because the host > > > > Maybe we can consider registering a new IPv6 address space for BIER. I think a lot of your concerns would be addressed. That way we don???t get in the way with already defined unicast behaviour and still leaves it open to treat the packet as unicast in some specific cases, like with tunnelling through non-BIER nodes. > > > >> Any BIER encapsulation needs to be able to support the features that are in the architecture. > > > > And we should not be afraid to allow exceptions and/or updates to the architecture draft if necessary. > > > >> An implementation that doesn't support SI is not compliant with the architecture. > > > > By allocating part of the ???prefix??? for the SI/SD identifier we can make this work just fine IMO. Since the SI/SD here is manually defined and the BitString length is fixed, I think there is really only need for one of them. If we call that SI or SD (or something else) we can argue about :-) > > > > Thx, > > > > Ice. From nobody Thu Sep 22 00:09:01 2016 Return-Path: X-Original-To: bier@ietfa.amsl.com Delivered-To: bier@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 5D70F12BFF6 for ; Thu, 22 Sep 2016 00:08:59 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -6.537 X-Spam-Level: X-Spam-Status: No, score=-6.537 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, RP_MATCHES_RCVD=-2.316, 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 n7g_Z734meWm for ; Thu, 22 Sep 2016 00:08:55 -0700 (PDT) Received: from lhrrgout.huawei.com (lhrrgout.huawei.com [194.213.3.17]) (using TLSv1 with cipher RC4-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id DA43A12BFD4 for ; Thu, 22 Sep 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b3JtYXRpay51bmktZXJsYW5nZW4uZGUNCj4gL0M9ZGUvQT1kNDAwL1A9dW5pLWVybGFuZ2VuL09V PWluZm9ybWF0aWsvUz1FY2tlcnQvRz1Ub2VybGVzcy8NCg0KLS0NCi0tLQ0KVG9lcmxlc3MuRWNr ZXJ0QGluZm9ybWF0aWsudW5pLWVybGFuZ2VuLmRlDQovQz1kZS9BPWQ0MDAvUD11bmktZXJsYW5n ZW4vT1U9aW5mb3JtYXRpay9TPUVja2VydC9HPVRvZXJsZXNzLw0K From nobody Thu Sep 22 01:03:38 2016 Return-Path: X-Original-To: bier@ietfa.amsl.com Delivered-To: bier@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 3B6ED12B761 for ; Thu, 22 Sep 2016 01:03:37 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -6.537 X-Spam-Level: X-Spam-Status: No, score=-6.537 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, RP_MATCHES_RCVD=-2.316, 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 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=?utf-8?B?W0JpZXJdIOetlOWkjTogIE5ldyBWZXJzaW9uIE5vdGlmaWNhdGlvbiBmb3Ig?= =?utf-8?Q?draft-pfister-bier-over-ipv6-00.txt?= Thread-Index: AQHSFIbPi1SpAFJoiUyXtg4Nt6bahKCEoDyA Date: Thu, 22 Sep 2016 08:02:48 +0000 Message-ID: <1FEE3F8F5CCDE64C9A8E8F4AD27C19EE2BB1D75F@NKGEML515-MBX.china.huawei.com> References: <147280131368.24750.2582129788572723864.idtracker@ietfa.amsl.com> <3C470D17-363E-4F7D-B943-19FC52052C67@darou.fr> <10B5F14B-8A1B-4DFC-B21E-A314B1605213@darou.fr> <08b8ac29-459a-d5e5-524d-7b84d744b020@juniper.net> <1828FBD8-E44C-4DD6-8DEB-1A9766C6328E@cisco.com> <1FEE3F8F5CCDE64C9A8E8F4AD27C19EE2BB1D115@NKGEML515-MBX.china.huawei.com> <1FEE3F8F5CCDE64C9A8E8F4AD27C19EE2BB1D5CA@NKGEML515-MBX.china.huawei.com> <1FEE3F8F5CCDE64C9A8E8F4AD27C19EE2BB1D653@NKGEML515-MBX.china.huawei.com> In-Reply-To: <1FEE3F8F5CCDE64C9A8E8F4AD27C19EE2BB1D653@NKGEML515-MBX.china.huawei.com> Accept-Language: zh-CN, en-US Content-Language: zh-CN X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.111.184.181] Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 MIME-Version: 1.0 X-CFilter-Loop: Reflected X-Mirapoint-Virus-RAPID-Raw: score=unknown(0), refid=str=0001.0A020203.57E39051.011F, ss=1, re=0.000, recu=0.000, reip=0.000, cl=1, cld=1, fgs=0, ip=0.0.0.0, so=2013-06-18 04:22:30, dmn=2013-03-21 17:37:32 X-Mirapoint-Loop-Id: 45eef1b928a2b470f18311fbeb56be71 Archived-At: Cc: "bier@ietf.org" , Pierre Pfister , Eric C Rosen Subject: [Bier] =?utf-8?b?562U5aSNOiAg562U5aSNOiAgTmV3IFZlcnNpb24gTm90aWZp?= =?utf-8?q?cation_for_draft-pfister-bier-over-ipv6-00=2Etxt?= X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.17 Precedence: list List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 22 Sep 2016 08:03:37 -0000 QlRXLCBJIGZvdW5kIHRoZSBvbmx5IG1lcml0IG9mIHRoZSBJUHY2LUJJRVIgdGhhdCBJIGhhZCBl 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(version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Thu, 22 Sep 2016 08:34:49 GMT Content-Type: text/plain; charset=utf-8 Mime-Version: 1.0 (Mac OS X Mail 8.2 \(2104\)) From: IJsbrand Wijnands In-Reply-To: <1FEE3F8F5CCDE64C9A8E8F4AD27C19EE2BB1D653@NKGEML515-MBX.china.huawei.com> Date: Thu, 22 Sep 2016 10:34:49 +0200 Content-Transfer-Encoding: quoted-printable Message-Id: <787042C8-F789-408C-9F5B-5749E2BE91F5@cisco.com> References: <147280131368.24750.2582129788572723864.idtracker@ietfa.amsl.com> <3C470D17-363E-4F7D-B943-19FC52052C67@darou.fr> <10B5F14B-8A1B-4DFC-B21E-A314B1605213@darou.fr> <08b8ac29-459a-d5e5-524d-7b84d744b020@juniper.net> <1828FBD8-E44C-4DD6-8DEB-1A9766C6328E@cisco.com> <1FEE3F8F5CCDE64C9A8E8F4AD27C19EE2BB1D115@NKGEML515-MBX.china.huawei.com> <1FEE3F8F5CCDE64C9A8E8F4AD27C19EE2BB1D5CA@NKGEML515-MBX.china.huawei.com> <1FEE3F8F5CCDE64C9A8E8F4AD27C19EE2BB1D653@NKGEML515-MBX.china.huawei.com> To: Xuxiaohu X-Mailer: Apple Mail (2.2104) Archived-At: Cc: "bier@ietf.org" , Pierre Pfister , Eric C Rosen Subject: Re: [Bier] New Version Notification for draft-pfister-bier-over-ipv6-00.txt X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.17 Precedence: list List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 22 Sep 2016 08:34:53 -0000 Hi Xiaohu, > Firstly, I'm glad to see that your IPv6-BIER draft somehow echoes my = previous statement about the similarity between the BIER header and the = IPv6 header (see below): >=20 > https://www.ietf.org/mail-archive/web/bier/current/msg00101.html > https://www.ietf.org/proceedings/92/slides/slides-92-bier-1.pdf >=20 > That's a great progress!:) IMO. I=E2=80=99m happy for you, but I see that differently. The IPv6 BIER Prefix is a "Bit Index Forwarding Table" (BIFT) = Identifier, similar to how the BIER MPLS label is. The difference = between the two is that the MPLS label is local significant, and the = BIER prefix is global significant. Thx, Ice. From nobody Thu Sep 22 02:06:21 2016 Return-Path: X-Original-To: bier@ietfa.amsl.com Delivered-To: bier@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 3FAD712D0B5 for ; Thu, 22 Sep 2016 02:06:20 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -6.537 X-Spam-Level: X-Spam-Status: No, score=-6.537 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, RP_MATCHES_RCVD=-2.316, 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 DzzPZoof4MNM for ; Thu, 22 Sep 2016 02:06:18 -0700 (PDT) Received: from lhrrgout.huawei.com (lhrrgout.huawei.com [194.213.3.17]) (using TLSv1 with cipher RC4-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 3A12212D16C for ; Thu, 22 Sep 2016 02:06:17 -0700 (PDT) Received: from 172.18.7.190 (EHLO lhreml703-cah.china.huawei.com) ([172.18.7.190]) by lhrrg01-dlp.huawei.com (MOS 4.3.7-GA FastPath queued) with ESMTP id CWS28710; Thu, 22 Sep 2016 09:06:12 +0000 (GMT) Received: from NKGEML412-HUB.china.huawei.com (10.98.56.73) by lhreml703-cah.china.huawei.com (10.201.5.104) with Microsoft SMTP Server (TLS) id 14.3.235.1; Thu, 22 Sep 2016 10:06:10 +0100 Received: from NKGEML515-MBX.china.huawei.com ([fe80::a54a:89d2:c471:ff]) by nkgeml412-hub.china.huawei.com ([10.98.56.73]) with mapi id 14.03.0235.001; Thu, 22 Sep 2016 17:06:05 +0800 From: Xuxiaohu To: IJsbrand Wijnands Thread-Topic: [Bier] New Version Notification for draft-pfister-bier-over-ipv6-00.txt Thread-Index: AQHSFKw48CcTdrAX1ESel7wajOIDU6CFNVnw Date: Thu, 22 Sep 2016 09:06:05 +0000 Message-ID: <1FEE3F8F5CCDE64C9A8E8F4AD27C19EE2BB1D7C7@NKGEML515-MBX.china.huawei.com> References: <147280131368.24750.2582129788572723864.idtracker@ietfa.amsl.com> <3C470D17-363E-4F7D-B943-19FC52052C67@darou.fr> <10B5F14B-8A1B-4DFC-B21E-A314B1605213@darou.fr> <08b8ac29-459a-d5e5-524d-7b84d744b020@juniper.net> <1828FBD8-E44C-4DD6-8DEB-1A9766C6328E@cisco.com> <1FEE3F8F5CCDE64C9A8E8F4AD27C19EE2BB1D115@NKGEML515-MBX.china.huawei.com> <1FEE3F8F5CCDE64C9A8E8F4AD27C19EE2BB1D5CA@NKGEML515-MBX.china.huawei.com> <1FEE3F8F5CCDE64C9A8E8F4AD27C19EE2BB1D653@NKGEML515-MBX.china.huawei.com> <787042C8-F789-408C-9F5B-5749E2BE91F5@cisco.com> In-Reply-To: <787042C8-F789-408C-9F5B-5749E2BE91F5@cisco.com> Accept-Language: zh-CN, en-US Content-Language: zh-CN X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.111.184.181] Content-Type: text/plain; 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Thu, 22 Sep 2016 09:18:36 GMT Content-Type: text/plain; charset=us-ascii Mime-Version: 1.0 (Mac OS X Mail 8.2 \(2104\)) From: IJsbrand Wijnands In-Reply-To: <1FEE3F8F5CCDE64C9A8E8F4AD27C19EE2BB1D7C7@NKGEML515-MBX.china.huawei.com> Date: Thu, 22 Sep 2016 11:18:36 +0200 Content-Transfer-Encoding: quoted-printable Message-Id: <8A37AAF1-A59F-456C-93F1-803E741EB623@cisco.com> References: <147280131368.24750.2582129788572723864.idtracker@ietfa.amsl.com> <3C470D17-363E-4F7D-B943-19FC52052C67@darou.fr> <10B5F14B-8A1B-4DFC-B21E-A314B1605213@darou.fr> <08b8ac29-459a-d5e5-524d-7b84d744b020@juniper.net> <1828FBD8-E44C-4DD6-8DEB-1A9766C6328E@cisco.com> <1FEE3F8F5CCDE64C9A8E8F4AD27C19EE2BB1D115@NKGEML515-MBX.china.huawei.com> <1FEE3F8F5CCDE64C9A8E8F4AD27C19EE2BB1D5CA@NKGEML515-MBX.china.huawei.com> <1FEE3F8F5CCDE64C9A8E8F4AD27C19EE2BB1D653@NKGEML515-MBX.china.huawei.com> <787042C8-F789-408C-9F5B-5749E2BE91F5@cisco.com> <1FEE3F8F5CCDE64C9A8E8F4AD27C19EE2BB1D7C7@NKGEML515-MBX.china.huawei.com> To: Xuxiaohu X-Mailer: Apple Mail (2.2104) Archived-At: Cc: "bier@ietf.org" , Pierre Pfister , Eric C Rosen Subject: Re: [Bier] New Version Notification for draft-pfister-bier-over-ipv6-00.txt X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.17 Precedence: list List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 22 Sep 2016 09:18:40 -0000 Hi Xiaohu, > In fact, you could look the combination of = within the generic BIER header as "Bit Index Forwarding Table" (BIFT) = Identifier as well if you would like. BTW, that is globally significant = as well:) Yes, agreed. Thx, Ice. From nobody Thu Sep 22 05:28:30 2016 Return-Path: X-Original-To: bier@ietf.org Delivered-To: bier@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id D471312B0A7; Thu, 22 Sep 2016 05:28:25 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: internet-drafts@ietf.org To: X-Test-IDTracker: no X-IETF-IDTracker: 6.33.0 Auto-Submitted: auto-generated Precedence: bulk Message-ID: <147454730586.22498.15370604329206220191.idtracker@ietfa.amsl.com> Date: Thu, 22 Sep 2016 05:28:25 -0700 Archived-At: Cc: bier@ietf.org Subject: [Bier] I-D Action: draft-ietf-bier-ospf-bier-extensions-04.txt X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.17 List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 22 Sep 2016 12:28:26 -0000 A New Internet-Draft is available from the on-line Internet-Drafts directories. This draft is a work item of the Bit Indexed Explicit Replication of the IETF. Title : OSPF Extensions for BIER Authors : Peter Psenak Nagendra Kumar IJsbrand Wijnands Andrew Dolganow Tony Przygienda Jeffrey Zhang Sam Aldrin Filename : draft-ietf-bier-ospf-bier-extensions-04.txt Pages : 9 Date : 2016-09-22 Abstract: Bit Index Explicit Replication (BIER) is an architecture that provides multicast forwarding through a "BIER domain" without requiring intermediate routers to maintain multicast related per-flow state. Neither does BIER require an explicit tree-building protocol for its operation. A multicast data packet enters a BIER domain at a "Bit-Forwarding Ingress Router" (BFIR), and leaves the BIER domain at one or more "Bit-Forwarding Egress Routers" (BFERs). The BFIR router adds a BIER header to the packet. Such header contains a bit-string in which each bit represents exactly one BFER to forward the packet to. The set of BFERs to which the multicast packet needs to be forwarded is expressed by the according set of bits switched on in BIER packet header. This document describes the OSPF protocol extension required for BIER with MPLS encapsulation. The IETF datatracker status page for this draft is: https://datatracker.ietf.org/doc/draft-ietf-bier-ospf-bier-extensions/ There's also a htmlized version available at: https://tools.ietf.org/html/draft-ietf-bier-ospf-bier-extensions-04 A diff from the previous version is available at: https://www.ietf.org/rfcdiff?url2=draft-ietf-bier-ospf-bier-extensions-04 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 Sep 22 06:25:57 2016 Return-Path: X-Original-To: bier@ietf.org Delivered-To: bier@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id 5482912B433; Thu, 22 Sep 2016 06:25:52 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: internet-drafts@ietf.org To: X-Test-IDTracker: no X-IETF-IDTracker: 6.33.0 Auto-Submitted: auto-generated Precedence: bulk Message-ID: <147455075233.22494.10335183595067644752.idtracker@ietfa.amsl.com> Date: Thu, 22 Sep 2016 06:25:52 -0700 Archived-At: Cc: bier@ietf.org Subject: [Bier] I-D Action: draft-ietf-bier-oam-requirements-02.txt X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.17 List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 22 Sep 2016 13:25:52 -0000 A New Internet-Draft is available from the on-line Internet-Drafts directories. This draft is a work item of the Bit Indexed Explicit Replication of the IETF. Title : Operations, Administration and Maintenance (OAM) Requirements for Bit Index Explicit Replication (BIER) Layer Authors : Greg Mirsky Erik Nordmark Carlos Pignataro Nagendra Kumar Sam Aldrin Lianshu Zheng Mach Chen Nobo Akiya Santosh Pallagatti Filename : draft-ietf-bier-oam-requirements-02.txt Pages : 6 Date : 2016-09-22 Abstract: This document describes a list of functional requirement toward Operations, Administration and Maintenance (OAM) toolset in Bit Index Explicit Replication (BIER) layer of a network. The IETF datatracker status page for this draft is: https://datatracker.ietf.org/doc/draft-ietf-bier-oam-requirements/ There's also a htmlized version available at: https://tools.ietf.org/html/draft-ietf-bier-oam-requirements-02 A diff from the previous version is available at: https://www.ietf.org/rfcdiff?url2=draft-ietf-bier-oam-requirements-02 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 Sep 22 07:54:27 2016 Return-Path: X-Original-To: bier@ietf.org Delivered-To: bier@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id A857612B7EE; Thu, 22 Sep 2016 07:54:18 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: internet-drafts@ietf.org To: X-Test-IDTracker: no X-IETF-IDTracker: 6.33.0 Auto-Submitted: auto-generated Precedence: bulk Message-ID: <147455605868.22550.11114121328596141003.idtracker@ietfa.amsl.com> Date: Thu, 22 Sep 2016 07:54:18 -0700 Archived-At: Cc: bier@ietf.org Subject: [Bier] I-D Action: draft-ietf-bier-isis-extensions-03.txt X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.17 List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 22 Sep 2016 14:54:19 -0000 A New Internet-Draft is available from the on-line Internet-Drafts directories. This draft is a work item of the Bit Indexed Explicit Replication of the IETF. Title : BIER support via ISIS Authors : Les Ginsberg Tony Przygienda Sam Aldrin Jeffrey (Zhaohui) Zhang Filename : draft-ietf-bier-isis-extensions-03.txt Pages : 12 Date : 2016-09-22 Abstract: Specification of an ISIS extension to support BIER domains and sub- domains. The IETF datatracker status page for this draft is: https://datatracker.ietf.org/doc/draft-ietf-bier-isis-extensions/ There's also a htmlized version available at: https://tools.ietf.org/html/draft-ietf-bier-isis-extensions-03 A diff from the previous version is available at: https://www.ietf.org/rfcdiff?url2=draft-ietf-bier-isis-extensions-03 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 Sep 22 10:07:38 2016 Return-Path: X-Original-To: bier@ietfa.amsl.com Delivered-To: bier@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id CD70E12D98B for ; Thu, 22 Sep 2016 10:07:36 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -5.029 X-Spam-Level: X-Spam-Status: No, score=-5.029 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, FAKE_REPLY_C=1.486, HEADER_FROM_DIFFERENT_DOMAINS=0.001, RCVD_IN_DNSWL_MED=-2.3, RP_MATCHES_RCVD=-2.316] 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 IKjxea0qBHPE for ; Thu, 22 Sep 2016 10:07:35 -0700 (PDT) Received: from faui40.informatik.uni-erlangen.de (faui40.informatik.uni-erlangen.de [131.188.34.40]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 1269C12D8F9 for ; Thu, 22 Sep 2016 10:02:33 -0700 (PDT) Received: from faui40p.informatik.uni-erlangen.de (faui40p.informatik.uni-erlangen.de [IPv6:2001:638:a000:4134::ffff:77]) by faui40.informatik.uni-erlangen.de (Postfix) with ESMTP id BEAD358C4C6; Thu, 22 Sep 2016 19:02:31 +0200 (CEST) Received: by faui40p.informatik.uni-erlangen.de (Postfix, from userid 10463) id A5CA3B0A8EE; Thu, 22 Sep 2016 19:02:31 +0200 (CEST) Date: Thu, 22 Sep 2016 19:02:31 +0200 From: Toerless Eckert To: Xuxiaohu Message-ID: <20160922170231.GA15326@faui40p.informatik.uni-erlangen.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.5.21 (2010-09-15) Archived-At: Cc: Toerless Eckert , "bier@ietf.org" Subject: Re: [Bier] Scope of alternate encap work / eg: draft-xu-bier-encapsulation X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.17 Precedence: list List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 22 Sep 2016 17:07:37 -0000 On Thu, Sep 22, 2016 at 07:08:43AM +0000, Xuxiaohu wrote: > [Xiaohu3] If I understand it correctly, both the generic BIER encapsulation and the MPLS-BIER encapsulation are targeted for the tunnel case. Maybe I misunderstand your point. I am trying to figure out how we/the draft could better explain what the logical behavior of a BFR is when it uses your draft. > [Xiaohu3] BIER is at the network layer. Hence to transport BIER packets across an L2 network (e.g., Ethernet network), the BIER packets need to be encapsulated with an L2 header (e.g., Ethernet header) before entering that L2 network. In fact, you could look it as something like TRILL. If a BFR uses MPLS-BIER encap, the BFR becomes an LSR, and BFR-ID and BitString addressing is similar to eg the MPLS FEC. Aka: BFR is an L2.5 element with some novel L2.5 addressing. When we use your draft, and as you said 'native' encap being to put these BIER packets directly over eg: ethernet/MAC encap, then the semantic of BIER/BFR is probably still best described as L2.5 - there is still no end-to-end-network layer addressing, we still only have BFR-ID/Bitstring, but the hop-by-hop forwarding with DS instead of EXP is more like IP. If we allowed for your encap to go all the way from application source to application receiver, then it could be new network layer, and we'd elevate BFR-ID/Bitstring to a new type of network layer addresses, and then your encap could be called L3/network-layer BIER. This is the big difference to Pierres draft which solves that end-to-end piece by using the existing IPv6 addresses. If i would take your encap, strip away the TTL and DS fields, replace the (IP-)Protocol field with an Ethernet-Protocol field and use this form of BIER on an L2 switch, we would have an L2/Bridge version of BIER. Aka: BIER could be L2, L2.5, L3. > [Xiaohu3] Since the generic BIER is designed to be transport-independent, it seems confused to couple it with IP:) I think it would help to add a sentence explaining what "transport-independent" means in the case of your draft: -> In the BIER architecture, there are two "contextual fields" for the BitString: SI and Sub-Somain. With the BIER-MPLS encap, this context is established by MPLS. That ties the MPLS-BIER encap to not only some preceeding MPLS header with a label, but also to MPLS label binding procedures. -> By folding these fields into the BIER header, this dependency against MPLS is removed. That is what this draft calls "transport independent". Overall, the encap proposes an 'IP-like' L2.5 BFR/BIER-domain model: - It's IP-like because it proposes IP like QoS and encap (IP protocol). - It is not L3, because so far there are no attempts to make BFR-ID/BitString available as end-to-end L3 addresses, so prime target use of this encap is for networks with "transport services' on the edge, eg: like MPLS networks (without MPLS ;-). Cheers Toerless > > Best regards, > Xiaohu > > Cheers > Toerless > > > > [Xiaohu] See the above. > > > > If you want UDP inside your encap to be out of scope, please write that up, see suggested text above. > > > > [Xiaohu2] Sure, thanks again for your suggested text. > > > > Best regards, > > Xiaohu > > > > Cheers > > Toerless > > > > > Best regards, > > > Xiaohu > > > > > > 4. Can support for BIER-TE be in scope ? Would like a life-insurance bit: > > > "BIER-TE" in header. I hope we can keep all BIER header fields with same > > > semantic for BIER-TE, but if not, this bit would allow us to later on > > > modify how specific fields operate under BIER-TE. > > > > > > > > > 5. Tracing. In DetNet, the idea to use BIER-TE was brought up, and tracing of > > > the packet path was given as key reason. With just resetting bits. Which doesn't > > > help much to trace. Lets assume we have a "trace-bit" in the header. Only > > > lower 50% of bitstring get allocated. Every time BFR resets bits in lower > > > 50%, it sets same bits in upper 50%. Gives great tracing. Applicable to BIER > > > and BIER-TE. Oh, and keeps UDP checksum of BIER header unchanged. > > > > > > Toerless > > > > > > On Wed, Jul 20, 2016 at 05:17:14PM -0700, Greg Shepherd wrote: > > > > *, > > > > > > > > Thank you to all who attended and contributed to the lively > > > > discussion at the WG meeting in Berlin this week. This is what WG > > > > meetings should be - and some would say, used to be. > > > > > > > > >From a poll in the room, there was consensus to pull together a > > > > >volunteer > > > > design team to look at the various encap options, and based on > > > > use-case/operational considerations/support the team will pick one > > > > additional encap to document and offer as a WG item. The > > > > expectation is the list of volunteers will attend an interim WG > > > > meeting were we will work together for 2-3 days to hash out the direction and details. > > > > This will be a physical meeting, but will accommodate remote participation as well. > > > > > > > > I would like to see this work published and available for further > > > > discussion to the group at large on the list before and in the > > > > room during the next WG meeting in November. Considering the > > > > requirements for interim meeting announcements, the soonest we can > > > > reasonably target an interim meeting is Sept. > > > > > > > > Anyone wanting to volunteer as a member of the BIER Encap Design > > > > Team, please send email to the WG chairs. We will compile the > > > > list, then target a suitable location and dates from there. We > > > > look forward to pulling this enthusiastic team together in one direction. > > > > > > > > Thanks, > > > > Greg > > > From nobody Thu Sep 22 10:13:28 2016 Return-Path: X-Original-To: bier@ietfa.amsl.com Delivered-To: bier@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id BBE8112B2D3 for ; Thu, 22 Sep 2016 10:13:26 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -4.215 X-Spam-Level: X-Spam-Status: No, score=-4.215 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.001, RP_MATCHES_RCVD=-2.316] 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 gSjFE4bIpHFU for ; Thu, 22 Sep 2016 10:13:25 -0700 (PDT) Received: from faui40.informatik.uni-erlangen.de (faui40.informatik.uni-erlangen.de [IPv6:2001:638:a000:4134::ffff:40]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id F364212D9C8 for ; Thu, 22 Sep 2016 10:07:50 -0700 (PDT) Received: from faui40p.informatik.uni-erlangen.de (faui40p.informatik.uni-erlangen.de [IPv6:2001:638:a000:4134::ffff:77]) by faui40.informatik.uni-erlangen.de (Postfix) with ESMTP id 76C4B58C4C6; Thu, 22 Sep 2016 19:07:49 +0200 (CEST) Received: by faui40p.informatik.uni-erlangen.de (Postfix, from userid 10463) id 5FDECB0A8EE; Thu, 22 Sep 2016 19:07:49 +0200 (CEST) Date: Thu, 22 Sep 2016 19:07:49 +0200 From: Toerless Eckert To: IJsbrand Wijnands Message-ID: <20160922170749.GB13040@faui40p.informatik.uni-erlangen.de> References: <1828FBD8-E44C-4DD6-8DEB-1A9766C6328E@cisco.com> <1FEE3F8F5CCDE64C9A8E8F4AD27C19EE2BB1D115@NKGEML515-MBX.china.huawei.com> <1FEE3F8F5CCDE64C9A8E8F4AD27C19EE2BB1D5CA@NKGEML515-MBX.china.huawei.com> <1FEE3F8F5CCDE64C9A8E8F4AD27C19EE2BB1D653@NKGEML515-MBX.china.huawei.com> <787042C8-F789-408C-9F5B-5749E2BE91F5@cisco.com> <1FEE3F8F5CCDE64C9A8E8F4AD27C19EE2BB1D7C7@NKGEML515-MBX.china.huawei.com> <8A37AAF1-A59F-456C-93F1-803E741EB623@cisco.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <8A37AAF1-A59F-456C-93F1-803E741EB623@cisco.com> User-Agent: Mutt/1.5.21 (2010-09-15) Archived-At: Cc: Xuxiaohu , "bier@ietf.org" , Pierre Pfister , Eric C Rosen Subject: Re: [Bier] New Version Notification for draft-pfister-bier-over-ipv6-00.txt X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.17 Precedence: list List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 22 Sep 2016 17:13:27 -0000 How do i get a unique global allocation ? On Thu, Sep 22, 2016 at 11:18:36AM +0200, IJsbrand Wijnands wrote: > Hi Xiaohu, > > > In fact, you could look the combination of within the generic BIER header as "Bit Index Forwarding Table" (BIFT) Identifier as well if you would like. BTW, that is globally significant as well:) > > Yes, agreed. > > Thx, > > Ice. > > _______________________________________________ > BIER mailing list > BIER@ietf.org > https://www.ietf.org/mailman/listinfo/bier From nobody Thu Sep 22 12:22:54 2016 Return-Path: X-Original-To: bier@ietfa.amsl.com Delivered-To: bier@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 900CF12D9DB for ; Thu, 22 Sep 2016 12:22:52 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.922 X-Spam-Level: X-Spam-Status: No, score=-1.922 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=junipernetworks.onmicrosoft.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 VY7DZlxLTD1m for ; 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Thu, 22 Sep 2016 19:22:38 +0000 To: Toerless Eckert , IJsbrand Wijnands References: <147280131368.24750.2582129788572723864.idtracker@ietfa.amsl.com> <3C470D17-363E-4F7D-B943-19FC52052C67@darou.fr> <10B5F14B-8A1B-4DFC-B21E-A314B1605213@darou.fr> <08b8ac29-459a-d5e5-524d-7b84d744b020@juniper.net> <1828FBD8-E44C-4DD6-8DEB-1A9766C6328E@cisco.com> <1FEE3F8F5CCDE64C9A8E8F4AD27C19EE2BB1D115@NKGEML515-MBX.china.huawei.com> <20160921194356.GB29177@faui40p.informatik.uni-erlangen.de> From: Eric C Rosen Message-ID: Date: Thu, 22 Sep 2016 15:22:35 -0400 User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:45.0) Gecko/20100101 Thunderbird/45.3.0 MIME-Version: 1.0 In-Reply-To: <20160921194356.GB29177@faui40p.informatik.uni-erlangen.de> Content-Type: text/plain; charset="windows-1252"; format=flowed Content-Transfer-Encoding: 7bit X-Originating-IP: [66.129.241.13] X-ClientProxiedBy: SN2PR10CA0035.namprd10.prod.outlook.com (10.160.12.173) To SN1PR05MB2191.namprd05.prod.outlook.com (10.169.124.139) X-MS-Office365-Filtering-Correlation-Id: 166d0087-486d-44e5-deca-08d3e31dd157 X-Microsoft-Exchange-Diagnostics: 1; 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But let's look at it more closely. > |-- Rcv1 > --- BFER1 --| > / |-- Rcv2 > Src ---- Rtr --- BFIR > \ |-- Rcv3 > --- BFER2 --| > |-- Rcv4 > | > |-- Rtr2 ---- Rcv5 > > Src sends one IPv6 unicast packet indicating (Rcv1,Rcv3,Rcv4). It will have a prefix > owned by BFIR. Actually, in this example, I think Src is the BFIR, what you call BFIR is actually just a BFR at the border of a BIER domain. What does "owned by BFIR" mean? Is the prefix jointly "owned" by all the BFRs bordering the BIER domain? What about non-BFRs bordering the BIER domain? What keeps the packet from going to them instead? If Src thinks that the prefix is on the local network, it won't send the packet to Rtr, it will instead try to figure out the unicast MAC DA corresponding to the IP destination address. This DA doesn't exist, so the packet will get dropped. But if Src doesn't think that the prefix is on the local network connecting it to Rtr, it may send the BIER packet out a different interface. Where will the packet end up then? What if Src is doing load balancing among the default routers on the LAN, or among its interfaces? For a given flow, the "IPv6 destination address" will change from time to time, which means the load balancing hash for that flow will change from time to time. This is the "non-deterministic ECMP" problem discussed in the architecture. But since Src doesn't actually support BIER, it cannot use the solution described in the architecture draft. What if there are receivers on the same LAN as the Src? How will those receivers get the BIER packets sent by the Src? Since Src thinks the BIER packet is a unicast packet, it will encapsulate it in a unicast ethernet frame whose MAC DA is a MAC address of Rtr. Since Rtr is not a BFR, Rtr will remove the ethernet header and forward the IPv6-BIER packet towards (let's say, for the sake of argument) the node you call BFIR. How will BFIR get any copies of that packet back to the receivers that are on Src's subnet? Sending the BIER packet (with modified BitString) back to Rtr will cause a loop. > There it will be replicated by BIER. Copies arriving > at BFER1,BFER2 will be converted back to IP unicast packets, one copy to Rcv2 from > BFER1, one from BFER2 to Rcv3, one from BFER2 to Rcv4. Suppose Src had an IP multicast packet to send, and encapsulated it in an IPv6-BIER header. In that case, a BFER needs to decapsulate the packet and multicast the payload to the LAN on which the receivers reside. How does a BFER know whether to (a) decapsulate and multicast or (b) whether to replicate, overwrite the destination address, and unicast? I hope the answer isn't that the BFER needs to inspect the payload and guess what the hosts are expecting. BFER2 needs to know which BFR-ids represent hosts on any particular LAN to which it is attached. A BFR-id is just a shorthand for a BFR-prefix, i.e., for an IP address. If BFER2 wants to use unicast replication to transmit on the last hop, why not just use the actual IP addresses of the receivers? I don't see how BFER2 can get a BIER packet to Rcv5. Rtr2 will at best loop the packet back to BFER2, and at worst the packet will get forwarded (through a route not necessarily shown in the above picture) all the way back to "BFIR", which "owns the prefix". > How about supporting remote receivers like Rcv5 ? Sources can be remote so > it would make sense to allow bidirectional support. Might need some signaling > to BFER2 to map a remote IP address to a bit. > Each BFR and non-BFR can have a host route for every possible receiver, and some magic can be used to associate a BFR-id with each host route. That would eliminate some of the routing and looping issues. There might be a few scaling issues though. BTW, if one wants the BFR-ids to represent receiver hosts, one is going to need a lot more BFR-ids than if the BFR-ids represent BFERs. So one would certainly want to use an encapsulation that allows more than a 64-bit BitString. One could try to compensate for the very short BitString by having lots of sub-domains. Then for each application (or perhaps each flow) one could try to assign the BFR-ids densely. But we've heard that sub-domains aren't necessary for this encapsulation. More importantly, if a short BitString leads to more sub-domains, we will see an increase in the operational complexity and signaling load of the scheme. From nobody Thu Sep 22 20:16:23 2016 Return-Path: X-Original-To: bier@ietfa.amsl.com Delivered-To: bier@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id B5C5112BA99 for ; Thu, 22 Sep 2016 20:16:21 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -6.537 X-Spam-Level: X-Spam-Status: No, score=-6.537 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, RP_MATCHES_RCVD=-2.316, 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 4yxKY3vQEz4b for ; Thu, 22 Sep 2016 20:16:19 -0700 (PDT) Received: from lhrrgout.huawei.com (lhrrgout.huawei.com [194.213.3.17]) (using TLSv1 with cipher RC4-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 011BB12BA18 for ; Thu, 22 Sep 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X-Mirapoint-Loop-Id: e74e939636958464aece027b0a58b3cb Archived-At: Cc: "bier@ietf.org" , Pierre Pfister , Eric C Rosen Subject: [Bier] =?gb2312?b?tPC4tDogIE5ldyBWZXJzaW9uIE5vdGlmaWNhdGlvbiBm?= =?gb2312?b?b3IgZHJhZnQtcGZpc3Rlci1iaWVyLW92ZXItaXB2Ni0wMC50eHQ=?= X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.17 Precedence: list List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 23 Sep 2016 03:16:22 -0000 VGhlIGNvbWJpbmF0aW9uIG9mIDxCU0wsIFN1Yi1kb21haW4sIFNJPiBoYXMgYmVlbiBleHBsaWNp dGx5IGNvbnRhaW5lZCBpbiB0aGUgcmVjZWl2ZWQgQklFUiBwYWNrZXQuIEhlbmNlIGp1c3QgcmVh ZGluZyB0aGVtIGlzIGVub3VnaDopDQoNCkJlc3QgcmVnYXJkcywNClhpYW9odQ0KDQo+IC0tLS0t 08q8/tStvP4tLS0tLQ0KPiC3orz+yMs6IFRvZXJsZXNzIEVja2VydCBbbWFpbHRvOnR0ZStpZXRm QGNzLmZhdS5kZV0NCj4gt6LLzcqxvOQ6IDIwMTbE6jnUwjIzyNUgMTowOA0KPiDK1bz+yMs6IElK c2JyYW5kIFdpam5hbmRzDQo+ILOty806IFh1eGlhb2h1OyBiaWVyQGlldGYub3JnOyBQaWVycmUg 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bier@ietfa.amsl.com Delivered-To: bier@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id CA53612B832 for ; Thu, 22 Sep 2016 20:25:07 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -6.537 X-Spam-Level: X-Spam-Status: No, score=-6.537 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, RP_MATCHES_RCVD=-2.316, 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 pejpMwOOgVB3 for ; Thu, 22 Sep 2016 20:25:05 -0700 (PDT) Received: from lhrrgout.huawei.com (lhrrgout.huawei.com [194.213.3.17]) (using TLSv1 with cipher RC4-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id BE5A612B6B8 for ; Thu, 22 Sep 2016 20:25:04 -0700 (PDT) Received: from 172.18.7.190 (EHLO lhreml706-cah.china.huawei.com) ([172.18.7.190]) by lhrrg01-dlp.huawei.com (MOS 4.3.7-GA FastPath queued) with ESMTP id CWT47999; Fri, 23 Sep 2016 03:25:02 +0000 (GMT) Received: from NKGEML411-HUB.china.huawei.com (10.98.56.70) by lhreml706-cah.china.huawei.com (10.201.5.182) with Microsoft SMTP Server (TLS) id 14.3.235.1; Fri, 23 Sep 2016 04:25:01 +0100 Received: from NKGEML515-MBX.china.huawei.com ([fe80::a54a:89d2:c471:ff]) by nkgeml411-hub.china.huawei.com ([10.98.56.70]) with mapi id 14.03.0235.001; Fri, 23 Sep 2016 11:24:56 +0800 From: Xuxiaohu To: Toerless Eckert Thread-Topic: [Bier] Scope of alternate encap work / eg: draft-xu-bier-encapsulation Thread-Index: AQHSFUoOpJCnwnZP20uRbnXcBh2VlA== Date: Fri, 23 Sep 2016 03:24:55 +0000 Message-ID: <1FEE3F8F5CCDE64C9A8E8F4AD27C19EE2BB1DAA1@NKGEML515-MBX.china.huawei.com> References: <20160922170231.GA15326@faui40p.informatik.uni-erlangen.de> In-Reply-To: <20160922170231.GA15326@faui40p.informatik.uni-erlangen.de> Accept-Language: zh-CN, en-US Content-Language: zh-CN X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.111.184.181] Content-Type: text/plain; charset="gb2312" Content-Transfer-Encoding: base64 MIME-Version: 1.0 X-CFilter-Loop: Reflected X-Mirapoint-Virus-RAPID-Raw: score=unknown(0), refid=str=0001.0A0B0202.57E4A08F.0065, ss=1, re=0.000, recu=0.000, reip=0.000, cl=1, cld=1, fgs=0, ip=0.0.0.0, so=2013-06-18 04:22:30, dmn=2013-03-21 17:37:32 X-Mirapoint-Loop-Id: 99a3217f369682a007e379f7999e4cd0 Archived-At: Cc: "bier@ietf.org" Subject: Re: [Bier] Scope of alternate encap work / eg: draft-xu-bier-encapsulation X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.17 Precedence: list List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 23 Sep 2016 03:25:08 -0000 SGkgVG9lcmxlc3MsDQoNClRoYW5rcyBhZ2FpbiBmb3IgeW91IGdvb2Qgc3VnZ2VzdGlvbnMuIFRv 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([2601:646:8d01:89f0:3131:a00b:5332:1aa9]) by smtp.gmail.com with ESMTPSA id p189sm8745749pfb.5.2016.09.23.07.46.37 (version=TLS1 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Fri, 23 Sep 2016 07:46:37 -0700 (PDT) Content-Type: multipart/alternative; boundary=Apple-Mail-20212DA6-29D6-4DFE-A6ED-16AB4B0BE7E3 Mime-Version: 1.0 (1.0) From: Dino Farinacci X-Mailer: iPhone Mail (14A403) In-Reply-To: <1FEE3F8F5CCDE64C9A8E8F4AD27C19EE2BB1DAA1@NKGEML515-MBX.china.huawei.com> Date: Fri, 23 Sep 2016 07:46:36 -0700 Content-Transfer-Encoding: 7bit Message-Id: References: <20160922170231.GA15326@faui40p.informatik.uni-erlangen.de> <1FEE3F8F5CCDE64C9A8E8F4AD27C19EE2BB1DAA1@NKGEML515-MBX.china.huawei.com> To: Xuxiaohu Archived-At: Cc: Toerless Eckert , "bier@ietf.org" Subject: Re: [Bier] Scope of alternate encap work / eg: draft-xu-bier-encapsulation X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.17 Precedence: list List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 23 Sep 2016 14:46:42 -0000 --Apple-Mail-20212DA6-29D6-4DFE-A6ED-16AB4B0BE7E3 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable If you include references to VXLAN then you should also add references to RFC= 6830 LISP.=20 Dino > On Sep 22, 2016, at 8:24 PM, Xuxiaohu wrote: >=20 > Hi Toerless, >=20 > Thanks again for you good suggestions. To clarify the "tunnel" usage of th= e BIER encapsulation, I had added more text as follows: >=20 > OLD: > Protocol: a one-octet field indicating the protocol type of the > BIER payload as per the protocol numbers used in the Protocol > field [RFC5237]of the IPv4 header and the Next Header field of an > IPv6 header. The valid BIER payload types include (but are not > limited to) IPv4, IPv6, MPLS, VXLAN [RFC7348],VXLAN-GPE > [I-D.ietf-nvo3-vxlan-gpe]. The corresponding IP Protocol numbers > for VXLAN and VXLAN-GPE are to be allocated by IANA. >=20 > NEW: > Protocol: a one-octet field indicating the protocol type of the > BIER payload as per the protocol numbers used in the Protocol > field [RFC5237] of the IPv4 header and the Next Header field of an > IPv6 header. Theoretically, with the use of the IPv4/IPv6 > equivalent Protocol/Next-Header field, the payload of a BIER > packet could be any type of payload permitted within the IPv4/IPv6 > packet. However, this document currently only consider the use of > the BIER encapsulation for "transport" type services where the > encapsulated packets are either L2.5 (e.g., MPLS) or L3 (e.g., IP) > packets . The valid BIER payload types include (but are not > limited to) IPv4, IPv6, MPLS, VXLAN [RFC7348],VXLAN-GPE > [I-D.ietf-nvo3-vxlan-gpe]. The corresponding IP Protocol numbers > for VXLAN and VXLAN-GPE are to be allocated by IANA.=20 >=20 > Please check whether the above text is now OK. >=20 > Best regards, > Xiaohu >=20 >=20 >> -----=E9=82=AE=E4=BB=B6=E5=8E=9F=E4=BB=B6----- >> =E5=8F=91=E4=BB=B6=E4=BA=BA: Toerless Eckert [mailto:tte+ietf@cs.fau.de] >> =E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2016=E5=B9=B49=E6=9C=8823=E6=97=A5 1= :03 >> =E6=94=B6=E4=BB=B6=E4=BA=BA: Xuxiaohu >> =E6=8A=84=E9=80=81: Toerless Eckert; bier@ietf.org >> =E4=B8=BB=E9=A2=98: Re: [Bier] Scope of alternate encap work / eg: draft-= xu-bier-encapsulation >>=20 >>> On Thu, Sep 22, 2016 at 07:08:43AM +0000, Xuxiaohu wrote: >>> [Xiaohu3] If I understand it correctly, both the generic BIER encapsulat= ion and >> the MPLS-BIER encapsulation are targeted for the tunnel case. Maybe I >> misunderstand your point. >>=20 >> I am trying to figure out how we/the draft could better explain what the l= ogical >> behavior of a BFR is when it uses your draft. >>=20 >>> [Xiaohu3] BIER is at the network layer. Hence to transport BIER packets >> across an L2 network (e.g., Ethernet network), the BIER packets need to b= e >> encapsulated with an L2 header (e.g., Ethernet header) before entering th= at L2 >> network. In fact, you could look it as something like TRILL. >>=20 >> If a BFR uses MPLS-BIER encap, the BFR becomes an LSR, and BFR-ID and >> BitString addressing is similar to eg the MPLS FEC. Aka: BFR is an L2.5 e= lement >> with some novel L2.5 addressing. >>=20 >> When we use your draft, and as you said 'native' encap being to put these= BIER >> packets directly over eg: ethernet/MAC encap, then the semantic of BIER/B= FR >> is probably still best described as >> L2.5 - there is still no end-to-end-network layer addressing, we still on= ly have >> BFR-ID/Bitstring, but the hop-by-hop forwarding with DS instead of EXP is= more >> like IP. >>=20 >> If we allowed for your encap to go all the way from application source to= >> application receiver, then it could be new network layer, and we'd elevat= e >> BFR-ID/Bitstring to a new type of network layer addresses, and then your >> encap could be called L3/network-layer BIER. This is the big difference t= o >> Pierres draft which solves that end-to-end piece by using the existing IP= v6 >> addresses. >>=20 >> If i would take your encap, strip away the TTL and DS fields, replace the= >> (IP-)Protocol field with an Ethernet-Protocol field and use this form of= BIER on >> an L2 switch, we would have an L2/Bridge version of BIER. >>=20 >> Aka: BIER could be L2, L2.5, L3. >>=20 >>> [Xiaohu3] Since the generic BIER is designed to be >>> transport-independent, it seems confused to couple it with IP:) >>=20 >> I think it would help to add a sentence explaining what >> "transport-independent" >> means in the case of your draft: >>=20 >> -> In the BIER architecture, there are two "contextual fields" for >> the BitString: SI and Sub-Somain. With the BIER-MPLS encap, >> this context is established by MPLS. That ties the MPLS-BIER >> encap to not only some preceeding MPLS header with a label, but >> also to MPLS label binding procedures. >>=20 >> -> By folding these fields into the BIER header, this dependency against >> MPLS is removed. That is what this draft calls "transport independent".= >>=20 >> Overall, the encap proposes an 'IP-like' L2.5 BFR/BIER-domain model: >>=20 >> - It's IP-like because it proposes IP like QoS and encap (IP protocol).= >>=20 >> - It is not L3, because so far there are no attempts to make >> BFR-ID/BitString available as end-to-end L3 addresses, so >> prime target use of this encap is for networks with "transport >> services' on the edge, eg: like MPLS networks (without MPLS ;-). >>=20 >> Cheers >> Toerless >>>=20 >>> Best regards, >>> Xiaohu >>>=20 >>> Cheers >>> Toerless >>>=20 >>>>> [Xiaohu] See the above. >>>>=20 >>>> If you want UDP inside your encap to be out of scope, please write that= up, >> see suggested text above. >>>>=20 >>>> [Xiaohu2] Sure, thanks again for your suggested text. >>>>=20 >>>> Best regards, >>>> Xiaohu >>>>=20 >>>> Cheers >>>> Toerless >>>>=20 >>>>> Best regards, >>>>> Xiaohu >>>>>=20 >>>>> 4. Can support for BIER-TE be in scope ? Would like a life-insurance b= it: >>>>> "BIER-TE" in header. I hope we can keep all BIER header fields with >> same >>>>> semantic for BIER-TE, but if not, this bit would allow us to later o= n >>>>> modify how specific fields operate under BIER-TE. >>>>>=20 >>>>>=20 >>>>> 5. Tracing. In DetNet, the idea to use BIER-TE was brought up, and tra= cing >> of >>>>> the packet path was given as key reason. With just resetting bits. >> Which doesn't >>>>> help much to trace. Lets assume we have a "trace-bit" in the header.= >> Only >>>>> lower 50% of bitstring get allocated. Every time BFR resets bits in >> lower >>>>> 50%, it sets same bits in upper 50%. Gives great tracing. Applicabl= e >> to BIER >>>>> and BIER-TE. Oh, and keeps UDP checksum of BIER header >> unchanged. >>>>>=20 >>>>> Toerless >>>>>=20 >>>>>> On Wed, Jul 20, 2016 at 05:17:14PM -0700, Greg Shepherd wrote: >>>>>> *, >>>>>>=20 >>>>>> Thank you to all who attended and contributed to the lively >>>>>> discussion at the WG meeting in Berlin this week. This is what >>>>>> WG meetings should be - and some would say, used to be. >>>>>>=20 >>>>>>> =46rom a poll in the room, there was consensus to pull together a >>>>>>> volunteer >>>>>> design team to look at the various encap options, and based on >>>>>> use-case/operational considerations/support the team will pick >>>>>> one additional encap to document and offer as a WG item. The >>>>>> expectation is the list of volunteers will attend an interim WG >>>>>> meeting were we will work together for 2-3 days to hash out the >> direction and details. >>>>>> This will be a physical meeting, but will accommodate remote >> participation as well. >>>>>>=20 >>>>>> I would like to see this work published and available for >>>>>> further discussion to the group at large on the list before and >>>>>> in the room during the next WG meeting in November. Considering >>>>>> the requirements for interim meeting announcements, the soonest >>>>>> we can reasonably target an interim meeting is Sept. >>>>>>=20 >>>>>> Anyone wanting to volunteer as a member of the BIER Encap Design >>>>>> Team, please send email to the WG chairs. We will compile the >>>>>> list, then target a suitable location and dates from there. We >>>>>> look forward to pulling this enthusiastic team together in one direct= ion. >>>>>>=20 >>>>>> Thanks, >>>>>> Greg >>>>>=20 > _______________________________________________ > BIER mailing list > BIER@ietf.org > https://www.ietf.org/mailman/listinfo/bier --Apple-Mail-20212DA6-29D6-4DFE-A6ED-16AB4B0BE7E3 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable
If you include references to VXLAN then you should also add references to= RFC6830 LISP. 

Dino

On Sep 22, 2016, at 8:24 PM,= Xuxiaohu <xuxiaohu@huawei.com= > wrote:

Hi Toerless,

Thanks again for you good suggestions. To cl= arify the "tunnel" usage of the BIER encapsulation, I had added more text as= follows:

OLD:
  = ;   Protocol: a one-octet field indicating the protocol type o= f the
     BIER payload as per the= protocol numbers used in the Protocol
   &n= bsp; field [RFC5237]of the IPv4 header and the Next Header field of an<= /span>
     IPv6 header.  The valid B= IER payload types include (but are not
   &n= bsp; limited to) IPv4, IPv6, MPLS, VXLAN [RFC7348],VXLAN-GPE
=      [I-D.ietf-nvo3-vxlan-gpe].  The co= rresponding IP Protocol numbers
    &nb= sp;for VXLAN and VXLAN-GPE are to be allocated by IANA.

NEW:
     Protocol: a= one-octet field indicating the protocol type of the
 =     BIER payload as per the protocol numbers used in the= Protocol
     field [RFC5237] of t= he IPv4 header and the Next Header field of an
  =    IPv6 header.  Theoretically, with the use of the IPv4= /IPv6
     equivalent Protocol/Nex= t-Header field, the payload of a BIER
   &nb= sp; packet could be any type of payload permitted within the IPv4/IPv6<= /span>
     packet.  However, this d= ocument currently only consider the use of
  &nbs= p;  the BIER encapsulation for "transport" type services where the=
     encapsulated packets are eit= her L2.5 (e.g., MPLS) or L3 (e.g., IP)
   &n= bsp; packets . The valid BIER payload types include (but are not=
     limited to) IPv4, IPv6, MPLS, VXLAN= [RFC7348],VXLAN-GPE
     [I-D.iet= f-nvo3-vxlan-gpe].  The corresponding IP Protocol numbers
     for VXLAN and VXLAN-GPE are to be allocate= d by IANA.

Please check whether the above t= ext is now OK.

Best regards,
Xiaohu


-----=E9=82=AE=E4=BB=B6=E5=8E=9F=E4=BB=B6-----
=E5=8F=91=E4=BB=B6=E4=BA=BA: Toerless Eck= ert [mailto:tte+ietf@cs.fau.de]
=E5=8F=91=E9=80=81=E6=97= =B6=E9=97=B4: 2016=E5=B9=B49=E6=9C=8823=E6=97=A5 1:03
=E6=94=B6=E4=BB=B6=E4=BA=BA: Xuxiaohu
=E6=8A=84=E9=80=81: Toerle= ss Eckert; bier@ietf.org
=E4=B8=BB=E9=A2=98: Re: [Bier] Scop= e of alternate encap work / eg: draft-xu-bier-encapsulation

On Thu, Sep 22, 2016 at 07:08:43AM +0000, Xuxiaohu wrote:=
= [Xiaohu3] If I understand it correctly, both the generic BIER encapsul= ation and
the MPLS-BIER encapsulation are targeted for the tunnel case. Maybe I
misunderstand your point.=

I am trying to figure out how we/the dra= ft could better explain what the logical
behavior of a BFR is when it uses your draft.
<= /blockquote>

[Xiaohu3] BIER is at the n= etwork layer. Hence to transport BIER packets
across an L2 network (e.g., Ethernet n= etwork), the BIER packets need to be
encapsulated with an L2 header (e.g., Ethernet header) befor= e entering that L2
ne= twork. In fact, you could look it as something like TRILL.

If a BFR uses MPLS-BIER encap, the BFR becomes an LSR, and= BFR-ID and
BitString= addressing is similar to eg the MPLS FEC. Aka: BFR is an L2.5 element
with some novel L2.5 addre= ssing.

When we use your draft, and as you= said 'native' encap being to put these BIER
packets directly over eg: ethernet/MAC encap, then t= he semantic of BIER/BFR
is probably still best described as
L2.5 - there is still no end-to-end-network layer addressi= ng, we still only have
BFR-ID/Bitstring, but the hop-by-hop forwarding with DS instead of EXP is m= ore
like IP.

If we allowed for your encap to go all the way fr= om application source to
application receiver, then it could be new network layer, and we'd eleva= te
BFR-ID/Bitstring t= o a new type of network layer addresses, and then your
encap could be called L3/network-layer BIE= R. This is the big difference to
Pierres draft which solves that end-to-end piece by using the ex= isting IPv6
addresses= .

If i would take your encap, strip away t= he TTL and DS fields, replace the
(IP-)Protocol  field with an Ethernet-Protocol field and u= se this form of BIER on
an L2 switch, we would have an L2/Bridge version of BIER.

Aka: BIER could be L2, L2.5, L3.
<= blockquote type=3D"cite">
[Xiaohu3] Since the generic BIER is des= igned to be
transport-independent, it seems confused to co= uple it with IP:)

I think it= would help to add a sentence explaining what
"transport-independent"
means in the case of your draft:

-> In the BIER architecture, there are two "contextual= fields" for
 &= nbsp;the BitString: SI and Sub-Somain. With the BIER-MPLS encap,
<= /blockquote>
  this context is est= ablished by MPLS. That ties the MPLS-BIER
  encap to not only some preceeding MPLS hea= der with a label, but
  also to MPLS label binding procedures.
=

-> By folding these fields into the BIER header, this depende= ncy against
 &n= bsp;MPLS is removed. That is what this draft calls "transport independent".<= /span>

Overall, the encap proposes an 'IP-like' L= 2.5 BFR/BIER-domain model:
=
  -= It's IP-like because it proposes IP like QoS and encap (IP protocol).

  - It is not L3, because so far th= ere are no attempts to make
    BFR-ID/BitString available as end-to-end L3 a= ddresses, so
 &= nbsp;  prime target use of this encap is for networks with "transp= ort
  &nbs= p; services' on the edge, eg: like MPLS networks (without MPLS ;-).

=
Cheers
   Toerless

<= /blockquote>
Best r= egards,
Xiaohu

<= /blockquote>
Cheers=
   Toerless

=
[Xiaohu] See the= above.

If you want UDP i= nside your encap to be out of scope, please write that up,
see suggeste= d text above.

[Xiaohu2] Sure, thanks again for your suggested t= ext.

Best regards,
Xiaohu

Cheers
&n= bsp;  Toerless
=
Best regards,
=
Xiaohu

4. Can support for BIER-TE be in scope ? Would like a lif= e-insurance bit:
  "BIER-TE" in header. I hop= e we can keep all BIER header fields with
same
<= /blockquote>
  semantic for BIER-= TE, but if not, this bit would allow us to later on
<= /blockquote>
&nbs= p; modify how specific fields operate under BIER-TE.


5. Tracing. In DetNet, the idea t= o use BIER-TE was brought up, and tracing
of
  the packet path was= given as key reason. With just resetting bits.
Which does= n't
  he= lp much to trace. Lets assume we have a "trace-bit" in the header.
Only
&nbs= p; lower 50% of bitstring get allocated. Every time BFR resets bits in<= /span>
lower
<= span>   50%, it sets same bits in upper 50%. Gives great tracing. &= nbsp;Applicable
to BIER
  and BIER-TE.  Oh, and keeps UDP che= cksum of BIER header
unchanged.
<= blockquote type=3D"cite">
Toerless
<= span>
On Wed, Jul 20, 2016 at 05:17:14PM -0700, Greg She= pherd wrote:
<= blockquote type=3D"cite">
*,

Thank you to all who attended and contributed t= o the lively
<= /blockquote>
discu= ssion at the WG meeting in Berlin this week. This is what
WG meetings should be - and some woul= d say, used to be.

=46rom a poll in the room, there was consensus to pull together a=
=
volunteer
design team to look at the various encap option= s, and based on
u= se-case/operational considerations/support the team will pick
one additional encap to documen= t and offer as a WG item. The
expectation is the list of volunteers will attend an interim WG=
=
meeting were we w= ill work together for 2-3 days to hash out the
direction and details.
=
This will be a physical meeting, but will ac= commodate remote
participation as well.

I would like t= o see this work published and available for
further discussion to the group at large on the l= ist before and
in= the room during the next WG meeting in November. Considering
the requirements for interim me= eting announcements, the soonest
we can reasonably target an interim meeting is Sept.
=

<= blockquote type=3D"cite">
Anyone wanting to volunteer as a member of t= he BIER Encap Design
Team, please send email to the WG chairs. We will compile the
=
list, then target a suitabl= e location and dates from there. We
look forward to pulling this enthusiastic team together i= n one direction.
=
=
Thanks,
Greg

= _______________________________________________
BIER m= ailing list
BIER@ietf.org
ht= tps://www.ietf.org/mailman/listinfo/bier
= --Apple-Mail-20212DA6-29D6-4DFE-A6ED-16AB4B0BE7E3-- From nobody Fri Sep 23 11:22:57 2016 Return-Path: X-Original-To: bier@ietfa.amsl.com Delivered-To: bier@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id BDEDD12B33B for ; Fri, 23 Sep 2016 11:22:54 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -5.029 X-Spam-Level: X-Spam-Status: No, score=-5.029 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, FAKE_REPLY_C=1.486, HEADER_FROM_DIFFERENT_DOMAINS=0.001, RCVD_IN_DNSWL_MED=-2.3, RP_MATCHES_RCVD=-2.316] 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 4Tm-Nryaf5z6 for ; Fri, 23 Sep 2016 11:22:53 -0700 (PDT) Received: from faui40.informatik.uni-erlangen.de (faui40.informatik.uni-erlangen.de [131.188.34.40]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 5CC2A12B537 for ; Fri, 23 Sep 2016 11:17:39 -0700 (PDT) Received: from faui40p.informatik.uni-erlangen.de (faui40p.informatik.uni-erlangen.de [131.188.34.77]) by faui40.informatik.uni-erlangen.de (Postfix) with ESMTP id 2F10B58C4CC; Fri, 23 Sep 2016 20:17:38 +0200 (CEST) Received: by faui40p.informatik.uni-erlangen.de (Postfix, from userid 10463) id 1C3E0B0A90E; Fri, 23 Sep 2016 20:17:38 +0200 (CEST) Date: Fri, 23 Sep 2016 20:17:37 +0200 From: Toerless Eckert To: Eric C Rosen Message-ID: <20160923181737.GA8787@faui40p.informatik.uni-erlangen.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.5.21 (2010-09-15) Archived-At: Cc: Pierre Pfister , Xuxiaohu , "bier@ietf.org" , IJsbrand Wijnands Subject: Re: [Bier] New Version Notification for draft-pfister-bier-over-ipv6-00.txt X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.17 Precedence: list List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 23 Sep 2016 18:22:55 -0000 On Thu, Sep 22, 2016 at 03:22:35PM -0400, Eric C Rosen wrote: > Toerless, nice example. But let's look at it more closely. > > > |-- Rcv1 > > --- BFER1 --| > > / |-- Rcv2 > > Src ---- Rtr --- BFIR > > \ |-- Rcv3 > > --- BFER2 --| > > |-- Rcv4 > > | > > |-- Rtr2 ---- Rcv5 > > > >Src sends one IPv6 unicast packet indicating (Rcv1,Rcv3,Rcv4). It will > >have a prefix owned by BFIR. > Actually, in this example, I think Src is the BFIR, what you call > BFIR is actually just a BFR at the border of a BIER domain. I assume your argument is that in the current BIER arch, Bits are allocated to BF(E)R, and in this model Bits are allocated to Rcv's, therefore those have to be called BF(E)R, and accordingly Srcs have to be called BFIR. Yes ? The current BIER arch is a bit like MPLS: It does not have a strong differentiation of host vs. router (ES vs. IS). Ingres/egres LSR/BFR still need to operate most/all of the IS functions. In this proposal, BIER becomes end-to-end and Src/Rcv are really only ES/hosts, which is why i'd rather not want to call them BFR. Rather call them BIER-Hosts. But they are the entities to which Bits are assigned. > What does "owned by BFIR" mean? Is the prefix jointly "owned" by > all the BFRs bordering the BIER domain? What about non-BFRs > bordering the BIER domain? What keeps the packet from going to them > instead? I'd call a BFIR in this model a BFR that can receive packets with a BIER destination IPv6 address from routers unaware of BIER or from hosts. "owned" just means that the BFIR has set up IPv6 unicast routing, so that the prefix will be routed by non-BFRs to this router. Aka: prefix is assigned to some loopback interface on the BFIR, announced into IGP/BGP and arriving packets trigger BIER processing. In the most simple case, the "BIER IPv6 prefix" is "owned" by all the BFIR of the BIER domain, aka: it is anycast, so that packets will be routest to the nearest BFIR and will then become BIER forwarded inside the BIER domain. In a more complex case, one could consider that BFIR would "own" the "BIER IPv6 prefix, SI bits" prefixes (aka: announce prefixes including the SI bits differently, and each BFIR decides which of these prefixes to announce. > If Src thinks that the prefix is on the local network, it won't send > the packet to Rtr, it will instead try to figure out the unicast MAC > DA corresponding to the IP destination address. This DA doesn't > exist, so the packet will get dropped. But if Src doesn't think > that the prefix is on the local network connecting it to Rtr, it may > send the BIER packet out a different interface. Where will the > packet end up then? Right. Practical example: Rcv1 wants to send a BIER packet that should reach Rcv2 and Rcv3. We have one Prefix = "BIER IPv6 prefix / SI", every Src/Rcv in the picture has a bit in the Bitstring following that Prefix. How to forward ?!: Every Src/Rc (Host) will have a /128 address allocation for it's address 'Prefix,My-Bit'. Therefore any packet sent to a different BitString will just follow the default-route == go to the Default-router, and from there on (remote case) to the closest BFIR. Assuming the default-router is not a BFIR. Result: BFER would receive packet, do BIER replication, create one copy bck to Rcv2, and one down to BFIR to reach Rcv3. > What if Src is doing load balancing among the default routers on the > LAN, or among its interfaces? For a given flow, the "IPv6 > destination address" will change from time to time, which means the > load balancing hash for that flow will change from time to time. > This is the "non-deterministic ECMP" problem discussed in the > architecture. But since Src doesn't actually support BIER, it > cannot use the solution described in the architecture draft. I have not tried to track the relevance of the ECMP requirements, so i would appreciate the most simple relevant example to discuss better. Quick thoughts: Non-BIER ECMP: between SRc...Rtr..BFIR and between BFER...(Rtr)...Rcv: It's just like any othre IP ECMP problem, eg: if necessary do (Src,Dst, Proto,{SrcPort,DstPort}) ECMP ? BIER-ECMP: No entropy field, so definitely a good question. > What if there are receivers on the same LAN as the Src? How will > those receivers get the BIER packets sent by the Src? Since Src > thinks the BIER packet is a unicast packet, it will encapsulate it > in a unicast ethernet frame whose MAC DA is a MAC address of Rtr. > Since Rtr is not a BFR, Rtr will remove the ethernet header and > forward the IPv6-BIER packet towards (let's say, for the sake of > argument) the node you call BFIR. How will BFIR get any copies of > that packet back to the receivers that are on Src's subnet? Sending > the BIER packet (with modified BitString) back to Rtr will cause a > loop. |--- Host1 (Src/Rcv) BFR/ ---- Rtr ---| (eg: BFIR/BFER) |--- Host2 (Src/Rcv) |--- Host3 (Src/Rcv) Host1 sends BIER packet, Host2 and Host3 bits are in the BitString. Prefix of the BIER packet gets routed by Rtr to BFR. BFR performs BIER, creates separate copies to Host2 and Host. On Rtr, we need /128 routes for Host2 and Host3. Host1 sends BIER packet with ONLY Host3 as receiver. E voila, it gets turned around by Rtr because it matches the /128 route. > Suppose Src had an IP multicast packet to send, and encapsulated it > in an IPv6-BIER header. In that case, a BFER needs to decapsulate > the packet and multicast the payload to the LAN on which the > receivers reside. How does a BFER know whether to (a) decapsulate > and multicast or (b) whether to replicate, overwrite the destination > address, and unicast? I hope the answer isn't that the BFER needs > to inspect the payload and guess what the hosts are expecting. Well, i like the idea of addressing the hosts directly, also as he draft outlines, so no IP multicast packets involved. A more pragmatic option is of course to allocate bits to BFER. When the BFER sees its own bit, it just continues normal BFR operations: pass packet to the protocol indicated in the protocol field. Aka: IP-in-IP: decap, pass IP multicast encapsulated packet to IP multicast routing. Not sure how much value is left in this case over the more traditional options of having a full fledged separate BIER header. > BFER2 needs to know which BFR-ids represent hosts on any particular > LAN to which it is attached. A BFR-id is just a shorthand for a > BFR-prefix, i.e., for an IP address. If BFER2 wants to use unicast > replication to transmit on the last hop, why not just use the actual > IP addresses of the receivers? Except for the "BIER-IPv6-address" as the destination address in a received packet, there is no indication for a recevier that this is a BIER packet instead of a unicast packet. On Linux i would probably want to configure the network stack so that this address is not part of the default network context, but would only be useable to BIER apps. This would also prohibit that someone trying to attack BIER, eg: TCP packets with BIER destination address would NOT be able to reach application code that was not meant to handle BIER packets. If we had another way to recognize BIER packets on receivers, then i probably would also prefer to only use hosts unicast destination addresses from BFER to receiver. Should make things simpler. > I don't see how BFER2 can get a BIER packet to Rcv5. Rtr2 will at > best loop the packet back to BFER2, and at worst the packet will get > forwarded (through a route not necessarily shown in the above > picture) all the way back to "BFIR", which "owns the prefix". See above. Different prefix-length routes (prefix vs. /128). But thats just me, Pierre didn't include any such remote receivers. If we figure we don't need to support them, that would make things simpler. > Each BFR and non-BFR can have a host route for every possible > receiver, and some magic can be used to associate a BFR-id with each > host route. That would eliminate some of the routing and looping > issues. There might be a few scaling issues though. Right. > BTW, if one wants the BFR-ids to represent receiver hosts, one is > going to need a lot more BFR-ids than if the BFR-ids represent > BFERs. So one would certainly want to use an encapsulation that > allows more than a 64-bit BitString. One could try to compensate > for the very short BitString by having lots of sub-domains. Then > for each application (or perhaps each flow) one could try to assign > the BFR-ids densely. But we've heard that sub-domains aren't > necessary for this encapsulation. More importantly, if a short > BitString leads to more sub-domains, we will see an increase in the > operational complexity and signaling load of the scheme. Right. This can best be vetted with explicit examples. Toerless From nobody Fri Sep 23 11:37:10 2016 Return-Path: X-Original-To: bier@ietfa.amsl.com Delivered-To: bier@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id E4E9412BC31 for ; Fri, 23 Sep 2016 11:37:08 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.729 X-Spam-Level: X-Spam-Status: No, score=-2.729 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, FAKE_REPLY_C=1.486, HEADER_FROM_DIFFERENT_DOMAINS=0.001, RP_MATCHES_RCVD=-2.316] 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 uEWbDdQHex9k for ; Fri, 23 Sep 2016 11:37:07 -0700 (PDT) Received: from faui40.informatik.uni-erlangen.de (faui40.informatik.uni-erlangen.de [IPv6:2001:638:a000:4134::ffff:40]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 4D72412BC26 for ; Fri, 23 Sep 2016 11:37:07 -0700 (PDT) Received: from faui40p.informatik.uni-erlangen.de (faui40p.informatik.uni-erlangen.de [IPv6:2001:638:a000:4134::ffff:77]) by faui40.informatik.uni-erlangen.de (Postfix) with ESMTP id 8F3CD58C4CC; Fri, 23 Sep 2016 20:37:05 +0200 (CEST) Received: by faui40p.informatik.uni-erlangen.de (Postfix, from userid 10463) id 71546B0A913; Fri, 23 Sep 2016 20:37:05 +0200 (CEST) Date: Fri, 23 Sep 2016 20:37:05 +0200 From: Toerless Eckert To: Xuxiaohu Message-ID: <20160923183705.GB28042@faui40p.informatik.uni-erlangen.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.5.21 (2010-09-15) Archived-At: Cc: Toerless Eckert , "bier@ietf.org" , IJsbrand Wijnands , Eric C Rosen , Pierre Pfister Subject: Re: [Bier] ????: New Version Notification for draft-pfister-bier-over-ipv6-00.txt X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.17 Precedence: list List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 23 Sep 2016 18:37:09 -0000 On Fri, Sep 23, 2016 at 03:16:11AM +0000, Xuxiaohu wrote: > The combination of has been explicitly contained in the received BIER packet. Hence just reading them is enough:) No worries, i was just cynical on the use of the word global. To me global is Internet-wide=0xe and should not be used for something that is only unique inside a single administrative domain. Thats also why i find terminology of "global labels" in MPLS hilarious. Yes "domain-wide" label/address/... doesn't sound as sexy. I am using global 192.168/16 addresses in my homes on two continents ;-)) Cheers Toerless > Best regards, > Xiaohu > > > -----????????----- > > ??????: Toerless Eckert [mailto:tte+ietf@cs.fau.de] > > ????????: 2016??9??23?? 1:08 > > ??????: IJsbrand Wijnands > > ????: Xuxiaohu; bier@ietf.org; Pierre Pfister; Eric C Rosen > > ????: Re: [Bier] New Version Notification for draft-pfister-bier-over-ipv6-00.txt > > > > How do i get a unique global allocation ? > > > > On Thu, Sep 22, 2016 at 11:18:36AM +0200, IJsbrand Wijnands wrote: > > > Hi Xiaohu, > > > > > > > In fact, you could look the combination of within the > > generic BIER header as "Bit Index Forwarding Table" (BIFT) Identifier as well if > > you would like. BTW, that is globally significant as well:) > > > > > > Yes, agreed. > > > > > > Thx, > > > > > > Ice. > > > > > > _______________________________________________ > > > BIER mailing list > > > BIER@ietf.org > > > https://www.ietf.org/mailman/listinfo/bier From nobody Fri Sep 23 11:49:45 2016 Return-Path: X-Original-To: bier@ietfa.amsl.com Delivered-To: bier@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 5CC7212B069 for ; Fri, 23 Sep 2016 11:49:41 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -4.215 X-Spam-Level: X-Spam-Status: No, score=-4.215 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.001, RP_MATCHES_RCVD=-2.316] 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 4sfWWeWjaAUn for ; Fri, 23 Sep 2016 11:49:39 -0700 (PDT) Received: from faui40.informatik.uni-erlangen.de (faui40.informatik.uni-erlangen.de [IPv6:2001:638:a000:4134::ffff:40]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id D271B12B04C for ; Fri, 23 Sep 2016 11:49:38 -0700 (PDT) Received: from faui40p.informatik.uni-erlangen.de (faui40p.informatik.uni-erlangen.de [131.188.34.77]) by faui40.informatik.uni-erlangen.de (Postfix) with ESMTP id 7A11F58C4CC; Fri, 23 Sep 2016 20:49:37 +0200 (CEST) Received: by faui40p.informatik.uni-erlangen.de (Postfix, from userid 10463) id 655C9B0A913; Fri, 23 Sep 2016 20:49:37 +0200 (CEST) Date: Fri, 23 Sep 2016 20:49:37 +0200 From: Toerless Eckert To: Xuxiaohu Message-ID: <20160923184937.GD28042@faui40p.informatik.uni-erlangen.de> References: <20160922170231.GA15326@faui40p.informatik.uni-erlangen.de> <1FEE3F8F5CCDE64C9A8E8F4AD27C19EE2BB1DAA1@NKGEML515-MBX.china.huawei.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1FEE3F8F5CCDE64C9A8E8F4AD27C19EE2BB1DAA1@NKGEML515-MBX.china.huawei.com> User-Agent: Mutt/1.5.21 (2010-09-15) Archived-At: Cc: Toerless Eckert , "bier@ietf.org" Subject: Re: [Bier] Scope of alternate encap work / eg: draft-xu-bier-encapsulation X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.17 Precedence: list List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 23 Sep 2016 18:49:41 -0000 Sounds good. Thanks. On Fri, Sep 23, 2016 at 03:24:55AM +0000, Xuxiaohu wrote: > Hi Toerless, > > Thanks again for you good suggestions. To clarify the "tunnel" usage of the BIER encapsulation, I had added more text as follows: > > OLD: > Protocol: a one-octet field indicating the protocol type of the > BIER payload as per the protocol numbers used in the Protocol > field [RFC5237]of the IPv4 header and the Next Header field of an > IPv6 header. The valid BIER payload types include (but are not > limited to) IPv4, IPv6, MPLS, VXLAN [RFC7348],VXLAN-GPE > [I-D.ietf-nvo3-vxlan-gpe]. The corresponding IP Protocol numbers > for VXLAN and VXLAN-GPE are to be allocated by IANA. > > NEW: > Protocol: a one-octet field indicating the protocol type of the > BIER payload as per the protocol numbers used in the Protocol > field [RFC5237] of the IPv4 header and the Next Header field of an > IPv6 header. Theoretically, with the use of the IPv4/IPv6 > equivalent Protocol/Next-Header field, the payload of a BIER > packet could be any type of payload permitted within the IPv4/IPv6 > packet. However, this document currently only consider the use of > the BIER encapsulation for "transport" type services where the > encapsulated packets are either L2.5 (e.g., MPLS) or L3 (e.g., IP) > packets . The valid BIER payload types include (but are not > limited to) IPv4, IPv6, MPLS, VXLAN [RFC7348],VXLAN-GPE > [I-D.ietf-nvo3-vxlan-gpe]. The corresponding IP Protocol numbers > for VXLAN and VXLAN-GPE are to be allocated by IANA. > > Please check whether the above text is now OK. > > Best regards, > Xiaohu > > > > -----????????----- > > ??????: Toerless Eckert [mailto:tte+ietf@cs.fau.de] > > ????????: 2016??9??23?? 1:03 > > ??????: Xuxiaohu > > ????: Toerless Eckert; bier@ietf.org > > ????: Re: [Bier] Scope of alternate encap work / eg: draft-xu-bier-encapsulation > > > > On Thu, Sep 22, 2016 at 07:08:43AM +0000, Xuxiaohu wrote: > > > [Xiaohu3] If I understand it correctly, both the generic BIER encapsulation and > > the MPLS-BIER encapsulation are targeted for the tunnel case. Maybe I > > misunderstand your point. > > > > I am trying to figure out how we/the draft could better explain what the logical > > behavior of a BFR is when it uses your draft. > > > > > [Xiaohu3] BIER is at the network layer. Hence to transport BIER packets > > across an L2 network (e.g., Ethernet network), the BIER packets need to be > > encapsulated with an L2 header (e.g., Ethernet header) before entering that L2 > > network. In fact, you could look it as something like TRILL. > > > > If a BFR uses MPLS-BIER encap, the BFR becomes an LSR, and BFR-ID and > > BitString addressing is similar to eg the MPLS FEC. Aka: BFR is an L2.5 element > > with some novel L2.5 addressing. > > > > When we use your draft, and as you said 'native' encap being to put these BIER > > packets directly over eg: ethernet/MAC encap, then the semantic of BIER/BFR > > is probably still best described as > > L2.5 - there is still no end-to-end-network layer addressing, we still only have > > BFR-ID/Bitstring, but the hop-by-hop forwarding with DS instead of EXP is more > > like IP. > > > > If we allowed for your encap to go all the way from application source to > > application receiver, then it could be new network layer, and we'd elevate > > BFR-ID/Bitstring to a new type of network layer addresses, and then your > > encap could be called L3/network-layer BIER. This is the big difference to > > Pierres draft which solves that end-to-end piece by using the existing IPv6 > > addresses. > > > > If i would take your encap, strip away the TTL and DS fields, replace the > > (IP-)Protocol field with an Ethernet-Protocol field and use this form of BIER on > > an L2 switch, we would have an L2/Bridge version of BIER. > > > > Aka: BIER could be L2, L2.5, L3. > > > > > [Xiaohu3] Since the generic BIER is designed to be > > > transport-independent, it seems confused to couple it with IP:) > > > > I think it would help to add a sentence explaining what > > "transport-independent" > > means in the case of your draft: > > > > -> In the BIER architecture, there are two "contextual fields" for > > the BitString: SI and Sub-Somain. With the BIER-MPLS encap, > > this context is established by MPLS. That ties the MPLS-BIER > > encap to not only some preceeding MPLS header with a label, but > > also to MPLS label binding procedures. > > > > -> By folding these fields into the BIER header, this dependency against > > MPLS is removed. That is what this draft calls "transport independent". > > > > Overall, the encap proposes an 'IP-like' L2.5 BFR/BIER-domain model: > > > > - It's IP-like because it proposes IP like QoS and encap (IP protocol). > > > > - It is not L3, because so far there are no attempts to make > > BFR-ID/BitString available as end-to-end L3 addresses, so > > prime target use of this encap is for networks with "transport > > services' on the edge, eg: like MPLS networks (without MPLS ;-). > > > > Cheers > > Toerless > > > > > > Best regards, > > > Xiaohu > > > > > > Cheers > > > Toerless > > > > > > > > [Xiaohu] See the above. > > > > > > > > If you want UDP inside your encap to be out of scope, please write that up, > > see suggested text above. > > > > > > > > [Xiaohu2] Sure, thanks again for your suggested text. > > > > > > > > Best regards, > > > > Xiaohu > > > > > > > > Cheers > > > > Toerless > > > > > > > > > Best regards, > > > > > Xiaohu > > > > > > > > > > 4. Can support for BIER-TE be in scope ? Would like a life-insurance bit: > > > > > "BIER-TE" in header. I hope we can keep all BIER header fields with > > same > > > > > semantic for BIER-TE, but if not, this bit would allow us to later on > > > > > modify how specific fields operate under BIER-TE. > > > > > > > > > > > > > > > 5. Tracing. In DetNet, the idea to use BIER-TE was brought up, and tracing > > of > > > > > the packet path was given as key reason. With just resetting bits. > > Which doesn't > > > > > help much to trace. Lets assume we have a "trace-bit" in the header. > > Only > > > > > lower 50% of bitstring get allocated. Every time BFR resets bits in > > lower > > > > > 50%, it sets same bits in upper 50%. Gives great tracing. Applicable > > to BIER > > > > > and BIER-TE. Oh, and keeps UDP checksum of BIER header > > unchanged. > > > > > > > > > > Toerless > > > > > > > > > > On Wed, Jul 20, 2016 at 05:17:14PM -0700, Greg Shepherd wrote: > > > > > > *, > > > > > > > > > > > > Thank you to all who attended and contributed to the lively > > > > > > discussion at the WG meeting in Berlin this week. This is what > > > > > > WG meetings should be - and some would say, used to be. > > > > > > > > > > > > >From a poll in the room, there was consensus to pull together a > > > > > > >volunteer > > > > > > design team to look at the various encap options, and based on > > > > > > use-case/operational considerations/support the team will pick > > > > > > one additional encap to document and offer as a WG item. The > > > > > > expectation is the list of volunteers will attend an interim WG > > > > > > meeting were we will work together for 2-3 days to hash out the > > direction and details. > > > > > > This will be a physical meeting, but will accommodate remote > > participation as well. > > > > > > > > > > > > I would like to see this work published and available for > > > > > > further discussion to the group at large on the list before and > > > > > > in the room during the next WG meeting in November. Considering > > > > > > the requirements for interim meeting announcements, the soonest > > > > > > we can reasonably target an interim meeting is Sept. > > > > > > > > > > > > Anyone wanting to volunteer as a member of the BIER Encap Design > > > > > > Team, please send email to the WG chairs. We will compile the > > > > > > list, then target a suitable location and dates from there. We > > > > > > look forward to pulling this enthusiastic team together in one direction. > > > > > > > > > > > > Thanks, > > > > > > Greg > > > > > > _______________________________________________ > BIER mailing list > BIER@ietf.org > https://www.ietf.org/mailman/listinfo/bier -- --- tte@cs.fau.de From nobody Fri Sep 23 17:47:12 2016 Return-Path: X-Original-To: bier@ietfa.amsl.com Delivered-To: bier@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 0D2C412BDEB for ; Fri, 23 Sep 2016 17:47:11 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -6.536 X-Spam-Level: X-Spam-Status: No, score=-6.536 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, RP_MATCHES_RCVD=-2.316, 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 JkNSl2pE3Nsf for ; Fri, 23 Sep 2016 17:47:06 -0700 (PDT) Received: from lhrrgout.huawei.com (lhrrgout.huawei.com [194.213.3.17]) (using TLSv1 with cipher RC4-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 8C7B512BDF1 for ; Fri, 23 Sep 2016 17:47:05 -0700 (PDT) Received: from 172.18.7.190 (EHLO lhreml703-cah.china.huawei.com) ([172.18.7.190]) by lhrrg02-dlp.huawei.com (MOS 4.3.7-GA FastPath queued) with ESMTP id CRU78157; Sat, 24 Sep 2016 00:47:01 +0000 (GMT) Received: from NKGEML414-HUB.china.huawei.com (10.98.56.75) by lhreml703-cah.china.huawei.com (10.201.5.104) with Microsoft SMTP Server (TLS) id 14.3.235.1; Sat, 24 Sep 2016 01:46:59 +0100 Received: from NKGEML515-MBX.china.huawei.com ([fe80::a54a:89d2:c471:ff]) by nkgeml414-hub.china.huawei.com ([10.98.56.75]) with mapi id 14.03.0235.001; Sat, 24 Sep 2016 08:46:55 +0800 From: Xuxiaohu To: Dino Farinacci Thread-Topic: [Bier] Scope of alternate encap work / eg: draft-xu-bier-encapsulation Thread-Index: AQHSFUoOpJCnwnZP20uRbnXcBh2VlKCGoeAAgAEtmNA= Date: Sat, 24 Sep 2016 00:46:55 +0000 Message-ID: <1FEE3F8F5CCDE64C9A8E8F4AD27C19EE2BB1DDD9@NKGEML515-MBX.china.huawei.com> References: <20160922170231.GA15326@faui40p.informatik.uni-erlangen.de> <1FEE3F8F5CCDE64C9A8E8F4AD27C19EE2BB1DAA1@NKGEML515-MBX.china.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: [10.111.184.181] Content-Type: multipart/alternative; boundary="_000_1FEE3F8F5CCDE64C9A8E8F4AD27C19EE2BB1DDD9NKGEML515MBXchi_" MIME-Version: 1.0 X-CFilter-Loop: Reflected X-Mirapoint-Virus-RAPID-Raw: score=unknown(0), refid=str=0001.0A020202.57E5CD06.0070, ss=1, re=0.000, recu=0.000, reip=0.000, cl=1, cld=1, fgs=0, ip=0.0.0.0, so=2013-06-18 04:22:30, dmn=2013-03-21 17:37:32 X-Mirapoint-Loop-Id: bbfb9fa2f8190ff8fc38a4da8fd09e84 Archived-At: Cc: Toerless Eckert , "bier@ietf.org" Subject: [Bier] 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lhrrgout.huawei.com (lhrrgout.huawei.com [194.213.3.17]) (using TLSv1 with cipher RC4-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id EA33D12B2A6 for ; Fri, 23 Sep 2016 19:39:33 -0700 (PDT) Received: from 172.18.7.190 (EHLO lhreml701-cah.china.huawei.com) ([172.18.7.190]) by lhrrg02-dlp.huawei.com (MOS 4.3.7-GA FastPath queued) with ESMTP id CRU86131; Sat, 24 Sep 2016 02:39:31 +0000 (GMT) Received: from NKGEML414-HUB.china.huawei.com (10.98.56.75) by lhreml701-cah.china.huawei.com (10.201.5.93) with Microsoft SMTP Server (TLS) id 14.3.235.1; Sat, 24 Sep 2016 03:39:30 +0100 Received: from NKGEML515-MBX.china.huawei.com ([fe80::a54a:89d2:c471:ff]) by nkgeml414-hub.china.huawei.com ([10.98.56.75]) with mapi id 14.03.0235.001; Sat, 24 Sep 2016 10:39:26 +0800 From: Xuxiaohu To: Toerless Eckert Thread-Topic: ????: [Bier] New Version Notification for draft-pfister-bier-over-ipv6-00.txt Thread-Index: AQHSFcmDIfd0W23HNUiONFxrdaOkoKCH7erQ Date: Sat, 24 Sep 2016 02:39:25 +0000 Message-ID: <1FEE3F8F5CCDE64C9A8E8F4AD27C19EE2BB1DE70@NKGEML515-MBX.china.huawei.com> References: <20160923183705.GB28042@faui40p.informatik.uni-erlangen.de> In-Reply-To: <20160923183705.GB28042@faui40p.informatik.uni-erlangen.de> Accept-Language: zh-CN, en-US Content-Language: zh-CN X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.111.184.181] Content-Type: text/plain; charset="gb2312" Content-Transfer-Encoding: base64 MIME-Version: 1.0 X-CFilter-Loop: Reflected X-Mirapoint-Virus-RAPID-Raw: score=unknown(0), refid=str=0001.0A020203.57E5E764.000C, ss=1, re=0.000, recu=0.000, reip=0.000, cl=1, cld=1, fgs=0, ip=0.0.0.0, so=2013-06-18 04:22:30, dmn=2013-03-21 17:37:32 X-Mirapoint-Loop-Id: 0bdc06e87feaae2cb68a6a79a65e5116 Archived-At: Cc: Pierre Pfister , "bier@ietf.org" , IJsbrand Wijnands , Eric C Rosen Subject: [Bier] =?gb2312?b?tPC4tDogPz8/PzogIE5ldyBWZXJzaW9uIE5vdGlmaWNh?= 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X19fX19fXw0KPiA+ID4gPiBCSUVSIG1haWxpbmcgbGlzdA0KPiA+ID4gPiBCSUVSQGlldGYub3Jn DQo+ID4gPiA+IGh0dHBzOi8vd3d3LmlldGYub3JnL21haWxtYW4vbGlzdGluZm8vYmllcg0K From nobody Fri Sep 23 20:21:34 2016 Return-Path: X-Original-To: bier@ietfa.amsl.com Delivered-To: bier@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id E498B12BE6C for ; Fri, 23 Sep 2016 20:21:33 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -6.536 X-Spam-Level: X-Spam-Status: No, score=-6.536 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, RP_MATCHES_RCVD=-2.316, 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 pIfKhf-TwfwN for ; Fri, 23 Sep 2016 20:21:32 -0700 (PDT) Received: from lhrrgout.huawei.com (lhrrgout.huawei.com [194.213.3.17]) (using TLSv1 with cipher RC4-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 839D812BE59 for ; Fri, 23 Sep 2016 20:21:31 -0700 (PDT) Received: from 172.18.7.190 (EHLO lhreml702-cah.china.huawei.com) ([172.18.7.190]) by lhrrg01-dlp.huawei.com (MOS 4.3.7-GA FastPath queued) with ESMTP id CWU95761; Sat, 24 Sep 2016 03:21:28 +0000 (GMT) Received: from NKGEML412-HUB.china.huawei.com (10.98.56.73) by lhreml702-cah.china.huawei.com (10.201.5.99) with Microsoft SMTP Server (TLS) id 14.3.235.1; Sat, 24 Sep 2016 04:21:27 +0100 Received: from NKGEML515-MBX.china.huawei.com ([fe80::a54a:89d2:c471:ff]) by nkgeml412-hub.china.huawei.com ([10.98.56.73]) with mapi id 14.03.0235.001; Sat, 24 Sep 2016 11:21:24 +0800 From: Xuxiaohu To: "bier@ietf.org" Thread-Topic: draft-kumarzheng-bier-ping-03 Thread-Index: AdIWErn8Abf9fLzeSYWORUII+R312w== Date: Sat, 24 Sep 2016 03:21:23 +0000 Message-ID: <1FEE3F8F5CCDE64C9A8E8F4AD27C19EE2BB1DEE0@NKGEML515-MBX.china.huawei.com> Accept-Language: zh-CN, en-US Content-Language: zh-CN X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.111.184.181] Content-Type: multipart/alternative; boundary="_000_1FEE3F8F5CCDE64C9A8E8F4AD27C19EE2BB1DEE0NKGEML515MBXchi_" MIME-Version: 1.0 X-CFilter-Loop: Reflected X-Mirapoint-Virus-RAPID-Raw: score=unknown(0), refid=str=0001.0A0B0207.57E5F139.004D, ss=1, re=0.000, recu=0.000, reip=0.000, cl=1, cld=1, fgs=0, ip=0.0.0.0, so=2013-06-18 04:22:30, dmn=2013-03-21 17:37:32 X-Mirapoint-Loop-Id: 71d1de02fa5f28355ecc7c5579106354 Archived-At: Subject: [Bier] draft-kumarzheng-bier-ping-03 X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.17 Precedence: list List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 24 Sep 2016 03:21:34 -0000 --_000_1FEE3F8F5CCDE64C9A8E8F4AD27C19EE2BB1DEE0NKGEML515MBXchi_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hi co-authors of this draft, I'm curious to know the rationale of the choice that " BIER OAM is defined = in a way that it stays within BIER layer by following directly the BIER hea= der without mandating the need for IP header." In other words, what's the r= eal benefit of eliminating the IP header? Anyway, you would need IP protoco= l stack on each BFR, especially for reply mode 2 (i.e., Reply via IPv4/IPv6= UDP packet). In addition, I'm also wondering the necessity of Reply mode 3= (i.e., Reply via BIER packet). In other words, why does "the Initiator int= end to validate the return BIER path" since the forward and return BIER pat= hs between two BFRs may be totally asymmetric? Best regards, Xiaohu --_000_1FEE3F8F5CCDE64C9A8E8F4AD27C19EE2BB1DEE0NKGEML515MBXchi_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Hi co-authors of this draft,

 

I’m curious to know the r= ationale of the choice that “ BIER OAM is defined in a way that it st= ays within BIER layer by following directly the BIER header without mandati= ng the need for IP header.” In other words, what’s the real benefit of eliminating the IP header? Anyway, you would need IP p= rotocol stack on each BFR, especially for reply mode 2 (i.e., Reply via IPv= 4/IPv6 UDP packet). In addition, I’m also wondering the necessity of = Reply mode 3 (i.e., Reply via BIER packet). In other words, why does “the Initiator intend to validate the retur= n BIER path” since the forward and return BIER paths between two BFRs= may be totally asymmetric?

 

Best regards,=

Xiaohu

--_000_1FEE3F8F5CCDE64C9A8E8F4AD27C19EE2BB1DEE0NKGEML515MBXchi_-- From nobody Fri Sep 23 20:42:00 2016 Return-Path: X-Original-To: bier@ietfa.amsl.com Delivered-To: bier@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id C23AD12BD7D for ; Fri, 23 Sep 2016 20:41:58 -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, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_PASS=-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 0Sr02muMmBxC for ; Fri, 23 Sep 2016 20:41:57 -0700 (PDT) Received: from mail-yb0-x232.google.com (mail-yb0-x232.google.com [IPv6:2607:f8b0:4002:c09::232]) (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 0DF1412BCC0 for ; Fri, 23 Sep 2016 20:41:57 -0700 (PDT) Received: by mail-yb0-x232.google.com with SMTP id d69so74138525ybf.2 for ; Fri, 23 Sep 2016 20:41:57 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc; bh=B/L83uKfkW8mtu/n5Wo6POcIXwuSHzTRysSz5H32T6I=; b=mV25vNFmO6lKZyLDHV7Z5wZWRbFFoYPRH17nykrqNOiEzLjkPMlKgPLGLqPZHKDKNo g5RJhRypZNvC0ai26tineBLLThX0vmRp8gcvyqf65DA4q/OtHrM79EWYdSgpuB0wblQu 22rGt0/8XSA3vUgNIYYUyT4W/n90HK+nA/zPAX+QPdOy4yzoh3Ym3oc65G3YKazYq7KW DYvTtI8QHS08eX4aK51yKBUsADTgKS3tHnnUxTDPk6s/XQf7uNxiLcU4oL+Nm7nCLky0 mzaO1uJMFUUVEJsN6swIPdv38JGQyfmh70RlKmAylF6TMFoeeYbg+UF18lMWZR9Z4qud S4Cg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to:cc; bh=B/L83uKfkW8mtu/n5Wo6POcIXwuSHzTRysSz5H32T6I=; b=DAyOr3662vWVSllFUqD0vtAnXXHOL7qHuoRJqJrA4T8W6MoSkGSoqwa7GvUcioPaKn aoKFOK5u4oY9l2naZmNAR/tr77XE2j6PTjBgI1n78AqqMQR05OQUpdsvsbqQRINjNYaZ Ddkyyw0e9K+fPbNnbFvypnpbHSgOl9LwP9glJ9RwIUVEGZNe/txZn/Y5FWAitt7p04bi yNc+ow9mjoYszEblnJYxjlot8G7MvH+u/opWRxowmGcwcwvwY3xHH0I4Tu9NGBMznXWD sJ/r2T5UHqkWhwd5IpXqBbhXyHOTnRWm0oCgf1/G/ZyC0RoARhLlb+0ICsan1vhmgXjB Jrvg== X-Gm-Message-State: AA6/9RlgOZD5q1lbX3dsZ8ROBQLPYMu7I6AhRdySp17OnRSCX0X/DZIAwT32xBGR4sU/KNcGMnn/qSBVyEcU+A== X-Received: by 10.37.209.132 with SMTP id i126mr4927182ybg.29.1474688516234; Fri, 23 Sep 2016 20:41:56 -0700 (PDT) MIME-Version: 1.0 Received: by 10.37.172.134 with HTTP; Fri, 23 Sep 2016 20:41:55 -0700 (PDT) In-Reply-To: <1FEE3F8F5CCDE64C9A8E8F4AD27C19EE2BB1DEE0@NKGEML515-MBX.china.huawei.com> References: <1FEE3F8F5CCDE64C9A8E8F4AD27C19EE2BB1DEE0@NKGEML515-MBX.china.huawei.com> From: Greg Mirsky Date: Fri, 23 Sep 2016 20:41:55 -0700 Message-ID: To: Xuxiaohu Content-Type: multipart/alternative; boundary=94eb2c06b32e2a23ba053d38adb8 Archived-At: Cc: "bier@ietf.org" Subject: Re: [Bier] draft-kumarzheng-bier-ping-03 X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.17 Precedence: list List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 24 Sep 2016 03:41:59 -0000 --94eb2c06b32e2a23ba053d38adb8 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Hi Xiaohu, thank you for your thoughtful questions. Ensuring that active OAM is in-band with data, i.e. is fate-sharing, being monitored significantly simplifies defect localization. For the case of MPLS encapsulation preserving IP header has no apparent benefit as BIER header carries BFIR ID. As RFC 7110 demonstrated, there are benefits of controlling path used for Echo Reply. I think that in the future version we'll provide more details regarding use of different Reply modes. Regards, Greg On Fri, Sep 23, 2016 at 8:21 PM, Xuxiaohu wrote: > Hi co-authors of this draft, > > > > I=E2=80=99m curious to know the rationale of the choice that =E2=80=9C BI= ER OAM is defined > in a way that it stays within BIER layer by following directly the BIER > header without mandating the need for IP header.=E2=80=9D In other words,= what=E2=80=99s > the real benefit of eliminating the IP header? Anyway, you would need IP > protocol stack on each BFR, especially for reply mode 2 (i.e., Reply via > IPv4/IPv6 UDP packet). In addition, I=E2=80=99m also wondering the necess= ity of > Reply mode 3 (i.e., Reply via BIER packet). In other words, why does =E2= =80=9Cthe > Initiator intend to validate the return BIER path=E2=80=9D since the forw= ard and > return BIER paths between two BFRs may be totally asymmetric? > > > > Best regards, > > Xiaohu > > _______________________________________________ > BIER mailing list > BIER@ietf.org > https://www.ietf.org/mailman/listinfo/bier > > --94eb2c06b32e2a23ba053d38adb8 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
Hi Xiaohu,
thank you for your thoughtful questions.
Ensuring that active OAM is in-band with data, i.e. is fate-sharing= , being monitored significantly simplifies defect localization.
F= or the case of MPLS encapsulation preserving IP header has no apparent bene= fit as BIER header carries BFIR ID.
As RFC 7110 demonstrated, the= re are benefits of controlling path used for Echo Reply. I think that in th= e future version we'll provide more details regarding use of different = Reply modes.

Regards,
Greg

On Fri, Sep 23, 201= 6 at 8:21 PM, Xuxiaohu <xuxiaohu@huawei.com> wrote:

Hi co-authors of this draft,=

=C2=A0

I=E2=80=99m curious to know the= rationale of the choice that =E2=80=9C BIER OAM is defined in a way that i= t stays within BIER layer by following directly the BIER header without man= dating the need for IP header.=E2=80=9D In other words, what=E2=80=99s the real benefit of eliminating the IP header? Anyway, you would need IP p= rotocol stack on each BFR, especially for reply mode 2 (i.e., Reply via IPv= 4/IPv6 UDP packet). In addition, I=E2=80=99m also wondering the necessity o= f Reply mode 3 (i.e., Reply via BIER packet). In other words, why does =E2=80=9Cthe Initiator intend to validate the ret= urn BIER path=E2=80=9D since the forward and return BIER paths between two = BFRs may be totally asymmetric?

=C2=A0

Best regards,

Xiaohu


_______________________________________________
BIER mailing list
BIER@ietf.org
https://www.ietf.org/mailman/listinfo/bier


--94eb2c06b32e2a23ba053d38adb8-- From nobody Fri Sep 23 20:49:31 2016 Return-Path: X-Original-To: bier@ietfa.amsl.com Delivered-To: bier@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 22FA612B030 for ; Fri, 23 Sep 2016 20:49:29 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -6.536 X-Spam-Level: X-Spam-Status: No, score=-6.536 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, RP_MATCHES_RCVD=-2.316, 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 MQm43BrmbRlt for ; Fri, 23 Sep 2016 20:49:27 -0700 (PDT) Received: from lhrrgout.huawei.com (lhrrgout.huawei.com [194.213.3.17]) (using TLSv1 with cipher RC4-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 619F212B1FD for ; Fri, 23 Sep 2016 20:49:26 -0700 (PDT) Received: from 172.18.7.190 (EHLO lhreml703-cah.china.huawei.com) ([172.18.7.190]) by lhrrg01-dlp.huawei.com (MOS 4.3.7-GA FastPath queued) with ESMTP id CWU97720; Sat, 24 Sep 2016 03:49:24 +0000 (GMT) Received: from NKGEML413-HUB.china.huawei.com (10.98.56.74) by lhreml703-cah.china.huawei.com (10.201.5.104) with Microsoft SMTP Server (TLS) id 14.3.235.1; Sat, 24 Sep 2016 04:49:23 +0100 Received: from NKGEML515-MBX.china.huawei.com ([fe80::a54a:89d2:c471:ff]) by NKGEML413-HUB.china.huawei.com ([10.98.56.74]) with mapi id 14.03.0235.001; Sat, 24 Sep 2016 11:49:09 +0800 From: Xuxiaohu To: Xuxiaohu , "bier@ietf.org" Thread-Topic: draft-kumarzheng-bier-ping-03 Thread-Index: AdIWErn8Abf9fLzeSYWORUII+R312wAAtzJA Date: Sat, 24 Sep 2016 03:49:08 +0000 Message-ID: <1FEE3F8F5CCDE64C9A8E8F4AD27C19EE2BB1DF1C@NKGEML515-MBX.china.huawei.com> References: <1FEE3F8F5CCDE64C9A8E8F4AD27C19EE2BB1DEE0@NKGEML515-MBX.china.huawei.com> In-Reply-To: <1FEE3F8F5CCDE64C9A8E8F4AD27C19EE2BB1DEE0@NKGEML515-MBX.china.huawei.com> Accept-Language: zh-CN, en-US Content-Language: zh-CN X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.111.184.181] Content-Type: multipart/alternative; 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charset="gb2312" Content-Transfer-Encoding: quoted-printable

BTW, I= =A1=AFm also wondering the real value of the BIER traceroute functionality = in real BIER networks.

&n= bsp;

It said= in the draft that

&n= bsp;

=A1=B0I= n trace route mode, Initiator MAY

 &= nbsp; include Target SI-Bitstring TLV to control the path trace towards any=

 &= nbsp; specific BFER or set of BFERs.=A1=B1

&n= bsp;

When in= itiator performs traceroute towards more than one BFER, how could it constr= uct a trace path of a tree? When initiator performs traceroute towards a si= ngle BFER, the trace path may be totally different from the real path of a BIER packet could containing that BFER a= nd other BFERs, so what=A1=AFs the real value of BIER traceroute in practic= e?

&n= bsp;

Best re= gards,

Xiaohu<= o:p>

&n= bsp;

=B7=A2=BC=FE=C8=CB: BIER [mailto:bier-bounces@ietf.org] =B4=FA= =B1=ED Xuxiaohu
=B7=A2= =CB=CD=CA=B1=BC=E4: 2016=C4=EA9=D4=C224=C8=D5 11:21
=CA=D5=BC=FE=C8=CB: bier@ietf.org
=D6=F7=CC=E2: [Bier] draft-kumarzheng-bier-ping-03

 

Hi co-authors of this draft,

 

I=A1=AFm curious to know the ra= tionale of the choice that =A1=B0 BIER OAM is defined in a way that it stay= s within BIER layer by following directly the BIER header without mandating= the need for IP header.=A1=B1 In other words, what=A1=AFs the real benefit of eliminating the IP header? Anyway, you would need IP p= rotocol stack on each BFR, especially for reply mode 2 (i.e., Reply via IPv= 4/IPv6 UDP packet). In addition, I=A1=AFm also wondering the necessity of R= eply mode 3 (i.e., Reply via BIER packet). In other words, why does =A1=B0the Initiator intend to validate the return= BIER path=A1=B1 since the forward and return BIER paths between two BFRs m= ay be totally asymmetric?

 

Best regards,=

Xiaohu

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573926775ffdf8815d938f32b31ef7f4 Archived-At: Cc: "bier@ietf.org" Subject: [Bier] =?utf-8?b?562U5aSNOiAg562U5aSNOiAgZHJhZnQta3VtYXJ6aGVuZy1i?= =?utf-8?q?ier-ping-03?= X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.17 Precedence: list List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 24 Sep 2016 06:42:34 -0000 --_000_1FEE3F8F5CCDE64C9A8E8F4AD27C19EE2BB1DFA2NKGEML515MBXchi_ Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 cy8gZGlyZWN0aW9uYWwvYmlkaXJlY3Rpb25hbC4NCg0K5Y+R5Lu25Lq6OiBCSUVSIFttYWlsdG86 Ymllci1ib3VuY2VzQGlldGYub3JnXSDku6PooaggWHV4aWFvaHUNCuWPkemAgeaXtumXtDogMjAx NuW5tDnmnIgyNOaXpSAxMjowOA0K5pS25Lu25Lq6OiBHcmVnIE1pcnNreQ0K5oqE6YCBOiBiaWVy QGlldGYub3JnDQrkuLvpopg6IFtCaWVyXSDnrZTlpI06IGRyYWZ0LWt1bWFyemhlbmctYmllci1w aW5nLTAzDQoNCkhpIEdyZWcsDQoNClRoYW5rcyBmb3IgeW91ciByZXNwb25zZS4NCg0KQWx0aG91 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Hi Xiaohu,

Target SI-BS is a optimization to perform the trace towards a specific BFER= . 

<Xiaohu>When initiator performs traceroute towards more than one BFER, how could i= t construct a trace path of a tree? 

<Nagendra> The response with Sender=A1=AFs handle = and sequence number should help correlate the (set of) responses to th= e request. The downstream mapping TLV and the upstream Interface TLV provides the details about the path. How it is used to const= ruct/display the path is an implementation matter.

<Xiaohu>When initiator performs traceroute towards a single BFER, the trace path may be totally different from the real path = of a BIER packet could containing that BFER and other BFERs, so what=A1=AFs= the real value of BIER traceroute in practice?

<Nagendra> The main intention of Target SI-BS is t= o make (as much) sure that the trace stays in-line to data path. A transit = node with multiple ECMP may use different keys for entropy hashing which potentially includes the incoming bistring = in the header and entropy value. Using the bit string of the to-be-tra= ced BFER alone in the BIER header will end up taking a different path. But = allowing the complete bistring (for any specific group for example) and using Target SI-BS and Responder BFR/BFER TLV will = help trace the path towards a specific BFER. By simply changing the entropy= , one may be able to detect the ECMP paths as well. As defined in section 4= .2, re-uses the machinery from RFC4379 for ECMP discovery. A more detailed explanation will be included in later = revision.

Thanks,
Nagendra


From: BIER <bier-bounces@ietf.org> on behalf of Xuxiaohu &l= t;xuxiaohu@huawei.com>
Date: Friday, September 23, 2016 at= 11:49 PM
To: Xuxiaohu <xuxiaohu@huawei.com>, "bier@ietf.org" <= bier@ietf.org>
Subject: [Bier] =B4=F0=B8=B4: draft= -kumarzheng-bier-ping-03

BTW, I= =A1=AFm also wondering the real value of the BIER traceroute functionality = in real BIER networks.

&n= bsp;

It said= in the draft that

&n= bsp;

=A1=B0I= n trace route mode, Initiator MAY

 &= nbsp; include Target SI-Bitstring TLV to control the path trace towards any=

 &= nbsp; specific BFER or set of BFERs.=A1=B1

&n= bsp;

When in= itiator performs traceroute towards more than one BFER, how could it constr= uct a trace path of a tree? When initiator performs traceroute towards a si= ngle BFER, the trace path may be totally different from the real path of a BIER packet could containing that BFER a= nd other BFERs, so what=A1=AFs the real value of BIER traceroute in practic= e?

&n= bsp;

Best re= gards,

Xiaohu<= o:p>

&n= bsp;

=B7=A2=BC=FE=C8=CB: BIER [mailto:bier-bounces@ietf.org] =B4=FA= =B1=ED Xuxiaohu
=B7=A2= =CB=CD=CA=B1=BC=E4: 2016=C4=EA9=D4=C224=C8=D5 11:21
=CA=D5=BC=FE=C8=CB: bier@ietf.org
=D6=F7=CC=E2: [Bier] draft-kumarzheng-bier-ping-03

 

Hi co-authors of this draft,

 

I=A1=AFm curious to know the ra= tionale of the choice that =A1=B0 BIER OAM is defined in a way that it stay= s within BIER layer by following directly the BIER header without mandating= the need for IP header.=A1=B1 In other words, what=A1=AFs the real benefit of eliminating the IP header? Anyway, you would need IP p= rotocol stack on each BFR, especially for reply mode 2 (i.e., Reply via IPv= 4/IPv6 UDP packet). In addition, I=A1=AFm also wondering the necessity of R= eply mode 3 (i.e., Reply via BIER packet). In other words, why does =A1=B0the Initiator intend to validate the return= BIER path=A1=B1 since the forward and return BIER paths between two BFRs m= ay be totally asymmetric?

 

Best regards,=

Xiaohu

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24 Sep 2016 12:26:07 +0000 Received: from XCH-RTP-014.cisco.com (xch-rtp-014.cisco.com [64.101.220.154]) by alln-core-2.cisco.com (8.14.5/8.14.5) with ESMTP id u8OCQ7qk006278 (version=TLSv1/SSLv3 cipher=AES256-SHA bits=256 verify=FAIL); Sat, 24 Sep 2016 12:26:07 GMT Received: from xch-rtp-015.cisco.com (64.101.220.155) by XCH-RTP-014.cisco.com (64.101.220.154) with Microsoft SMTP Server (TLS) id 15.0.1210.3; Sat, 24 Sep 2016 08:26:06 -0400 Received: from xch-rtp-015.cisco.com ([64.101.220.155]) by XCH-RTP-015.cisco.com ([64.101.220.155]) with mapi id 15.00.1210.000; Sat, 24 Sep 2016 08:26:06 -0400 From: "Nagendra Kumar Nainar (naikumar)" To: Xuxiaohu , Greg Mirsky Thread-Topic: =?gb2312?B?W0JpZXJdILTwuLQ6ICBkcmFmdC1rdW1hcnpoZW5nLWJpZXItcGluZy0wMw==?= Thread-Index: AQHSFhlbKtokhdmK90GlPZeJT6VzpKCIkWoA Date: Sat, 24 Sep 2016 12:26:06 +0000 Message-ID: References: <1FEE3F8F5CCDE64C9A8E8F4AD27C19EE2BB1DEE0@NKGEML515-MBX.china.huawei.com> <1FEE3F8F5CCDE64C9A8E8F4AD27C19EE2BB1DF43@NKGEML515-MBX.china.huawei.com> In-Reply-To: <1FEE3F8F5CCDE64C9A8E8F4AD27C19EE2BB1DF43@NKGEML515-MBX.china.huawei.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: user-agent: Microsoft-MacOutlook/14.5.7.151005 x-ms-exchange-messagesentrepresentingtype: 1 x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.24.52.80] Content-Type: multipart/alternative; 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charset="gb2312" Content-ID: <80607651EC893448B94BA5AEDE42209A@emea.cisco.com> Content-Transfer-Encoding: quoted-printable
HI Xuxiaho,

As Greg mentioned, the basic intention is to have it in-band to data t= raffic and avoid any other layer dependency if and when BIER layer in itsel= f can handle it. BIER header carries sufficient information that can be use= d for OAM request/response and so we leveraged it and avoid depending on other layer.

Thanks,
Nagendra

From: BIER <bier-bounces@ietf.org> on behalf of Xuxiaohu &l= t;xuxiaohu@huawei.com>
Date: Saturday, September 24, 2016 = at 12:08 AM
To: Greg Mirsky <gregimirsky@gmail.com>
Cc: "bier@ietf.org" <bier@i= etf.org>
Subject: [Bier] =B4=F0=B8=B4: draft= -kumarzheng-bier-ping-03

Hi Greg,

 <= /span>

Thanks for your re= sponse.

 <= /span>

Although BIER has = the BFIR-id, it seems much simpler and consistent to keep the request and r= eply message within the same format.

 <= /span>

If I understand RF= C7110 correctly, it=A1=AFs only applicable in the directional LSP case. How= ever, is there any directional path concept in the BIER case?

 <= /span>

Best regards,=

Xiaohu<= /span>

 <= /span>

=B7=A2=BC=FE=C8= =CB: Greg Mirsky [mail= to:gregimirsky@gmail.com]
=B7=A2=CB=CD=CA=B1=BC=E4: 2016=C4=EA9=D4=C224=C8=D5 1= 1:42
=CA=D5=BC=FE=C8=CB: Xuxiaohu
=B3=AD=CB=CD: bier@ietf.org
=D6=F7=CC=E2: Re: [Bier] draft-kumarzheng-bier-ping-03

 

Hi Xiaohu,

thank you for your thoughtful q= uestions.

Ensuring that active OAM is in-= band with data, i.e. is fate-sharing, being monitored significantly simplif= ies defect localization.

For the case of MPLS encapsulat= ion preserving IP header has no apparent benefit as BIER header carries BFI= R ID.

As RFC 7110 demonstrated, there= are benefits of controlling path used for Echo Reply. I think that in the = future version we'll provide more details regarding use of different Reply = modes.

 

Regards,

Greg

 

On Fri, Sep 23, 2016 at 8:21 PM= , Xuxiaohu <xux= iaohu@huawei.com> wrote:

Hi co-authors of this draft,

 

I=A1=AFm curious to know the rationale of the= choice that =A1=B0 BIER OAM is defined in a way that it stays within BIER = layer by following directly the BIER header without mandating the need for IP header.=A1=B1 In other words, what=A1=AFs the re= al benefit of eliminating the IP header? Anyway, you would need IP protocol= stack on each BFR, especially for reply mode 2 (i.e., Reply via IPv4/IPv6 = UDP packet). In addition, I=A1=AFm also wondering the necessity of Reply mode 3 (i.e., Reply via BIER packet). In other word= s, why does =A1=B0the Initiator intend to validate the return BIER path=A1= =B1 since the forward and return BIER paths between two BFRs may be totally= asymmetric?

 

Best regards,

Xiaohu

=
_______________________________________________
BIER mailing list
BIER@ietf.org
ht= tps://www.ietf.org/mailman/listinfo/bier

 

 --_000_D40BE7D11887D4naikumarciscocom_-- From nobody Mon Sep 26 11:09:22 2016 Return-Path: X-Original-To: bier@ietfa.amsl.com Delivered-To: bier@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id E7AD512B178 for ; Mon, 26 Sep 2016 11:09:19 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.689 X-Spam-Level: X-Spam-Status: No, score=-2.689 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-0.7, SPF_PASS=-0.001, T_HTML_ATTACH=0.01] 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 IAVkDTCMBPJw for ; Mon, 26 Sep 2016 11:09:17 -0700 (PDT) Received: from mail-qk0-x22f.google.com (mail-qk0-x22f.google.com [IPv6:2607:f8b0:400d:c09::22f]) (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 B55B312B1DF for ; Mon, 26 Sep 2016 11:09:16 -0700 (PDT) Received: by mail-qk0-x22f.google.com with SMTP id t7so173612964qkh.2 for ; Mon, 26 Sep 2016 11:09:16 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:reply-to:from:date:message-id:subject:to; bh=p5JBeN7QDtOpmZ8fcwWbef+y0kmqklnek4hOoQPz7uI=; b=pCEfv+RkVeJOczvfqG/3PaC5VR3VcRQdUhdEcyMuKu/DzUuh1fVj08HN414m7Ec7mb x4SM0Qfu0z6ziDLgz9YHVtipt8lowsLU40fuDg0rJIcf9083hVgyyLdqecS2kv1gduqZ 3xIscmduPqLebDwLVFbU8bLX0hTakIOTvuNSd5pDsG/28oHE7Sa/FfIXWak717nMOrB8 KGCNkLKAqWEPuDZzpYAyjIFPTAPF/t7sys+rBu32P4SBidnmEh3/JBLTTeii2C5WcZ6P mrHleYaWt5Zsq00Nq4jgGYzen1BmD3JCbuaGWtAplLizDeK/JG9sl10D1LOhrkIcRUOZ FOgA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:reply-to:from:date:message-id :subject:to; bh=p5JBeN7QDtOpmZ8fcwWbef+y0kmqklnek4hOoQPz7uI=; b=VnfRGEQVQ8XNeKxMRrpWecBE+Lmz18EsI8H7Y9MlKQrEV6B0BqD/3P095NiKk+Ixit knmIZg4kYX5gfaAVCOSHDhssko7aD5vJq/dvyqeAhlwrrYAl54WqVYAZTlT7BHDJdOoE vjcM1dUpipeHWnfG8zzjNUvygHJyK7LVE29o/Nskc1MG4n8n2Sj/nIBwSMOUTG5H/QNA 7dolScKW36QUwwXaNHTD5STeo9daZSPa4iyeY1tmElDh26cn/cGCyNM0Xbj0IfrfDh4S 9nOAoPlnyVTeVBQxDi3nAb+w2O8J0SnTsrIc7Eahg61vZGwefXyQm4zn0NL5guThmvOc qvvA== X-Gm-Message-State: AA6/9RnBVTqXDGdHIyqDTDGMJycwMirskD+1Pupviyc2IbzW+Avyi1VL4y+wczWxaCd9f1QkH0BNjsYjtve2DA== X-Received: by 10.55.144.71 with SMTP id s68mr13408948qkd.290.1474913355630; Mon, 26 Sep 2016 11:09:15 -0700 (PDT) MIME-Version: 1.0 Received: by 10.200.52.17 with HTTP; Mon, 26 Sep 2016 11:09:14 -0700 (PDT) From: Greg Shepherd Date: Mon, 26 Sep 2016 11:09:14 -0700 Message-ID: To: "bier@ietf.org" Content-Type: multipart/mixed; boundary=94eb2c083a88a365de053d6d06a4 Archived-At: Subject: [Bier] WebEx meeting invitation: BIER WG Interim X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.17 Precedence: list Reply-To: gjshep@gmail.com List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 26 Sep 2016 18:09:21 -0000 --94eb2c083a88a365de053d6d06a4 Content-Type: multipart/alternative; boundary=94eb2c083a88a365d9053d6d06a2 --94eb2c083a88a365d9053d6d06a2 Content-Type: text/plain; charset=UTF-8 ---------- Forwarded message ---------- From: Greg Shepherd (shep) Date: Mon, Sep 26, 2016 at 11:00 AM Subject: Fwd: (Forward to others) WebEx meeting invitation: BIER WG Interim To: Greg Shepherd Begin forwarded message: *From: *Gregory Shepherd *Subject: **(Forward to others) WebEx meeting invitation: BIER WG Interim* *Date: *September 26, 2016 at 10:59:46 AM PDT *To: * *Reply-To: * You can forward this invitation to others. Hello, Gregory Shepherd invites you to join this WebEx meeting. *BIER WG Interim* Every day, from Tuesday, September 27, 2016, to Thursday, September 29, 2016 10:00 am | Pacific Daylight Time (San Francisco, GMT-07:00) | 8 hrs *Join WebEx meeting* Meeting number: 204 897 315 Meeting password: BIERwg (243794 from phones) *Join by phone* *+1-408-525-6800 <%2B1-408-525-6800>* Call-in toll number (US/Canada) *+1-866-432-9903 <%2B1-866-432-9903>* Call-in toll-free number (US/Canada) Access code: 204 897 315 Global call-in numbers | Toll-free calling restrictions Add this meeting to your calendar. (Cannot add from mobile devices.) Can't join the meeting? Contact support. IMPORTANT NOTICE: Please note that this WebEx service allows audio and other information sent during the session to be recorded, which may be discoverable in a legal matter. By joining this session, you automatically consent to such recordings. If you do not consent to being recorded, discuss your concerns with the host or do not join the session. --94eb2c083a88a365d9053d6d06a2 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable

---------- Forwarded messag= e ----------
From: Greg Shepherd (shep) <shep@cisco.com>
Date: Mon, Sep 26, 2016 at 11:00 AM
Subject: Fwd: (Forwa= rd to others) WebEx meeting invitation: BIER WG Interim
To: Greg Shepher= d <gjshep@gmail.com>

<= br>


Begin forwarded message:

From: Gregory Shepherd <messenger@webex.com>
Subject: (Forward to others) WebEx meeting invitation: BIER W= G Interim
Date: September 26, 2016 at 10:59:46 AM PDT
Reply-To: <shep@cisco.com>

You can forward this invitation to others.
Hello,
Gregory Shepherd invites you to join this WebEx meeting.
=C2=A0
BIER WG Interim
Every day, from Tuesday, September 27, 2016, to Thursday, September 29, 201= 6
10:00 am=C2=A0=C2=A0|=C2=A0=C2=A0Pacific Daylight Time (San Francisco, GMT-= 07:00)=C2=A0=C2=A0|=C2=A0=C2=A08 hrs
=C2=A0
Join WebEx me= eting
Meeting number: 204 897 315
Meeting password: BIERwg (243794 from phones)
=C2=A0
Join by phone
+1-408-525-6800=C2=A0Call-in toll number (US/Canada)
+1-866-432-9903=C2=A0Call-in toll-free number (US/Canada)
Access code:=C2=A0204 897 315
Global call-in numbers=C2=A0=C2=A0|=C2=A0=C2=A0Toll-free calling restrictions
=C2=A0
Add this meeting= =C2=A0to your calendar. (Cannot add from mobile devices.)
=C2=A0
Can't join the meeting?=C2=A0Contact suppor= t.
=C2=A0
IMPORTANT NOTICE: Please note that this WebEx service allows audio and othe= r information sent during the session to be recorded, which may be discover= able in a legal matter. By joining this session, you automatically consent = to such recordings. If you do not consent to being recorded, discuss your concerns with the host or do not j= oin the session.

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juniper.net X-MS-Exchange-CrossTenant-originalarrivaltime: 27 Sep 2016 19:55:18.4248 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: bea78b3c-4cdb-4130-854a-1d193232e5f4 X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM5PR05MB3146 Archived-At: Subject: [Bier] encap in DC X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.17 Precedence: list List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 27 Sep 2016 19:55:22 -0000 Hi Dino, What to follow up on the discussion in this morning's interim meeting wheth= er/why BIER-ether may not be liked by DC operators. You mentioned that DC operators may only want to work with IP (v4/v6) and t= hey want to be able to continue to use IP tools like ping/traceroute. To clarify, with BIER-ether it'd still be IP based: the payload is IP (with= IP mcast header) enclosed in BIER enclosed in Ether. IP ping/traceroute wi= ll still work, and there will be BIER specific ping/traceroute extensions t= o figure out the reachability/paths at BIER layer. Even if we use BIER-ipv6, there will still be need for BIER specific ping/t= raceroute tools. Jeffrey From nobody Tue Sep 27 14:17:20 2016 Return-Path: X-Original-To: bier@ietfa.amsl.com Delivered-To: bier@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 9A38012B4DB for ; Tue, 27 Sep 2016 14:17:18 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.697 X-Spam-Level: X-Spam-Status: No, score=-2.697 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_FROM=0.001, HTML_IMAGE_ONLY_32=0.001, HTML_IMAGE_RATIO_08=0.001, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-0.7, SPF_PASS=-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 ZfBcmIRSMvJW for ; Tue, 27 Sep 2016 14:17:16 -0700 (PDT) Received: from mail-qt0-x230.google.com (mail-qt0-x230.google.com [IPv6:2607:f8b0:400d:c0d::230]) (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 73FA712B156 for ; Tue, 27 Sep 2016 14:17:14 -0700 (PDT) Received: by mail-qt0-x230.google.com with SMTP id l91so13725996qte.3 for ; Tue, 27 Sep 2016 14:17:14 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:subject:from:in-reply-to:date:cc:message-id:references :to; bh=1KjA952D2sMDU2yV61+3viRSWRGYNyhdGOZfA8CqGPI=; b=Y0LWLo35CQj1rUyrL2+BIbcIeMooQ+db949yS3VCv8rqfTmZtEyK9KYumiPQEU+fgJ HE54dgyOsYNF4lIFhVJJScN5ncbqqcqq5IGlIYLubfgncF10sBASdPvmIMjZ4kPOJGYG oa6GMSGcHmEkzRIdeND1OMqOdOE4cXsFIw9g4YR+mnMqp/nIR2bCRPqoTi80jCAV0mv4 LgWmT2Kv15kPWvVwpKAGtPHwRVTUiJ5Elm8vO/Jkgmo8fUI8nJTI33sTjrIT9cb73+QK rJrRplC1CkMKC4ZuBnPVrCiZF3xPfkAYvgU5X94wBcSafZKH1Ofihnw3yLQupIIKhhXD zJMw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:subject:from:in-reply-to:date:cc :message-id:references:to; bh=1KjA952D2sMDU2yV61+3viRSWRGYNyhdGOZfA8CqGPI=; b=OXiASlZgdPlUqiuyDnraL2+2jO7cPrCxKoVK4cZZqIosnN9F1UpayPOXTvYD1LMpcC W40TrkbTik3c9MeIm+u429WhwBNJzEhk/PqjJ88UQkrMa82uPqxZ8920sVG438ivTd5L VX5PYej+daEDtQGnwAeurGnJeX162Z7ZitVFH+e1JloPFv9lOD0NJPrYQLEBEunFeMHb HwN4Cw1XqZE7DgQ08K2H1newX16O2KfNdibl0d5L5kovGbprh/Mo1c6Jxy9jX+P4/ico Nrg7hDkOijF5cnPwjSyPpL5kxcU2movLltQ3SpxXVf5DJs6cHui9T3UGGH7zhgP5C31/ drlw== X-Gm-Message-State: AA6/9Rls0v9LMlAvdqaKfIyn2RjgQvdfwKkJim0AVvVHiaFzZIOcRKNZVPWg2+XzkjZyjw== X-Received: by 10.200.34.219 with SMTP id g27mr30230238qta.42.1475011033554; Tue, 27 Sep 2016 14:17:13 -0700 (PDT) Received: from [10.30.1.213] (ip-64-134-232-243.public.wayport.net. [64.134.232.243]) by smtp.gmail.com with ESMTPSA id k65sm2258201qkf.7.2016.09.27.14.17.11 (version=TLS1 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Tue, 27 Sep 2016 14:17:13 -0700 (PDT) Content-Type: multipart/alternative; boundary="Apple-Mail=_633D8D62-5FBC-4F6F-A80E-677E1E6CB46E" Mime-Version: 1.0 (Mac OS X Mail 9.3 \(3124\)) From: Dino Farinacci In-Reply-To: Date: Tue, 27 Sep 2016 14:17:10 -0700 Message-Id: References: To: Jeffrey Zhang X-Mailer: Apple Mail (2.3124) Archived-At: Cc: "bier@ietf.org" Subject: Re: [Bier] encap in DC X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.17 Precedence: list List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 27 Sep 2016 21:17:19 -0000 --Apple-Mail=_633D8D62-5FBC-4F6F-A80E-677E1E6CB46E Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=utf-8 > Hi Dino, >=20 > What to follow up on the discussion in this morning's interim meeting = whether/why BIER-ether may not be liked by DC operators. >=20 > You mentioned that DC operators may only want to work with IP (v4/v6) = and they want to be able to continue to use IP tools like = ping/traceroute. Right. > To clarify, with BIER-ether it'd still be IP based: the payload is IP = (with IP mcast header) enclosed in=20 "IP based" means that a BIER message would be *inside* an IP header that = was inside an ethertype of 0x0800 or 0x86dd. =E2=80=9CBIER-ether=E2=80=9D = means that an ethertype would be allocated for a BIER header. I think from a hardware point of view, and for vendor efficiency, an = ethertype would probably be a good way to go. But the message to = customers is that Bier is a layer-3 protocol and is not subject to the = same forwarding behavior as an L2 switch would perform. That is =E2=80=9CBier is routable=E2=80=9D, meaning it is hop by hop = forwarding. > BIER enclosed in Ether. IP ping/traceroute will still work, and there = will be BIER specific ping/traceroute extensions to figure out the = reachability/paths at BIER layer. If Bier, using this header definition: was run over its own ethertype, would NOT allow traceroute to work. = Since traceroute uses TTL decrement as a procedure to invoke return ICMP = messages. The above Bier header has no TTL. So you could only use existing traceroute if there was a IP protocol = codepoint for Bier and it run over IPv4 and IPv6. Dino > Even if we use BIER-ipv6, there will still be need for BIER specific = ping/traceroute tools. >=20 > Jeffrey >=20 > _______________________________________________ > BIER mailing list > BIER@ietf.org > https://www.ietf.org/mailman/listinfo/bier --Apple-Mail=_633D8D62-5FBC-4F6F-A80E-677E1E6CB46E Content-Type: multipart/related; type="text/html"; boundary="Apple-Mail=_FD53CBFA-A0C7-4417-A151-9FE88FC303A9" --Apple-Mail=_FD53CBFA-A0C7-4417-A151-9FE88FC303A9 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=utf-8
Hi Dino,

What to follow up on the discussion in this = morning's interim meeting whether/why BIER-ether may not be liked = by DC operators.

You mentioned that DC = operators may only want to work with IP (v4/v6) and they want to be able = to continue to use IP tools like ping/traceroute.

Right.

To = clarify, with BIER-ether it'd still be IP based: the payload is IP (with = IP mcast header) enclosed in 

"IP based" means that a BIER message would be *inside* = an IP header that was inside an ethertype of 0x0800 or 0x86dd. = =E2=80=9CBIER-ether=E2=80=9D means that an ethertype would be allocated = for a BIER header.

I think from a hardware point of view, and for vendor = efficiency, an ethertype would probably be a good way to go. But the = message to customers is that Bier is a layer-3 protocol and is not = subject to the same forwarding behavior as an L2 switch would = perform.

That = is =E2=80=9CBier is routable=E2=80=9D, meaning it is hop by hop = forwarding.

BIER enclosed in Ether. IP ping/traceroute will still work, = and there will be BIER specific ping/traceroute extensions to = figure out the reachability/paths at BIER layer.

If Bier, = using this header definition:


was run over its own ethertype, would NOT allow traceroute to = work. Since traceroute uses TTL decrement as a procedure to invoke = return ICMP messages. The above Bier header has no TTL.

So you could only use = existing traceroute if there was a IP protocol codepoint for Bier and it = run over IPv4 and IPv6.

Dino

Even if we use BIER-ipv6, there will still be = need for BIER specific ping/traceroute tools.

Jeffrey

_______________________________________________
BIER mailing list
BIER@ietf.org
https://www.ietf.org/mailman/listinfo/bier

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by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id GsyQMUA7Fecj for ; Tue, 27 Sep 2016 14:34:17 -0700 (PDT) Received: from mail-io0-x231.google.com (mail-io0-x231.google.com [IPv6:2607:f8b0:4001:c06::231]) (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 AB1FA12B2A7 for ; Tue, 27 Sep 2016 14:34:16 -0700 (PDT) Received: by mail-io0-x231.google.com with SMTP id r145so29904946ior.0 for ; Tue, 27 Sep 2016 14:34:16 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc; bh=Gg9xRpb8t3rGJABNwr3CowFNDFpiN//XO6Qw81EOLcI=; b=tWeIBWwv4B7wHN3J8Z4HxpC9ccm5CcRLn2FBjbO0z1oeAiBEIdkMtRgnM0tiaGVkx0 hPcObI9P/cFhQ6VkfqjJ5dhrePxmFWzZrB+Epbb/4fnfhFNlezU2/DDKSZ64oOlGdyv/ /WzhgBjnEa18rinh/Tqi8LnNKMNqbZeytbnJmhhGtjyN0MliM+eK+nwcTG5jYISfoX/5 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HTTP; Tue, 27 Sep 2016 14:33:35 -0700 (PDT) In-Reply-To: References: From: Tony Przygienda Date: Tue, 27 Sep 2016 14:33:35 -0700 Message-ID: To: Dino Farinacci Content-Type: multipart/related; boundary=001a1141a524a1bb30053d8401ec Archived-At: Cc: Jeffrey Zhang , "bier@ietf.org" Subject: Re: [Bier] encap in DC X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.17 Precedence: list List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 27 Sep 2016 21:34:20 -0000 --001a1141a524a1bb30053d8401ec Content-Type: multipart/alternative; boundary=001a1141a524a1bb2c053d8401eb --001a1141a524a1bb2c053d8401eb Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable MPLS carrying this encaps has TTL ... On Tue, Sep 27, 2016 at 2:17 PM, Dino Farinacci wrote= : > Hi Dino, > > > What to follow up on the discussion in this morning's interim meeting > whether/why BIER-ether may not be liked by DC operators. > > You mentioned that DC operators may only want to work with IP (v4/v6) and > they want to be able to continue to use IP tools like ping/traceroute. > > > Right. > > To clarify, with BIER-ether it'd still be IP based: the payload is IP > (with IP mcast header) enclosed in > > > "IP based" means that a BIER message would be *inside* an IP header that > was inside an ethertype of 0x0800 or 0x86dd. =E2=80=9CBIER-ether=E2=80=9D= means that an > ethertype would be allocated for a BIER header. > > I think from a hardware point of view, and for vendor efficiency, an > ethertype would probably be a good way to go. But the message to customer= s > is that Bier is a layer-3 protocol and is not subject to the same > forwarding behavior as an L2 switch would perform. > > That is =E2=80=9CBier is routable=E2=80=9D, meaning it is hop by hop forw= arding. > > BIER enclosed in Ether. IP ping/traceroute will still work, and there wil= l > be BIER specific ping/traceroute extensions to figure out the > reachability/paths at BIER layer. > > > If Bier, using this header definition: > > > was run over its own ethertype, would NOT allow traceroute to work. Since > traceroute uses TTL decrement as a procedure to invoke return ICMP > messages. The above Bier header has no TTL. > > So you could only use existing traceroute if there was a IP protocol > codepoint for Bier and it run over IPv4 and IPv6. > > Dino > > Even if we use BIER-ipv6, there will still be need for BIER specific > ping/traceroute tools. > > Jeffrey > > _______________________________________________ > BIER mailing list > BIER@ietf.org > https://www.ietf.org/mailman/listinfo/bier > > > > _______________________________________________ > BIER mailing list > BIER@ietf.org > https://www.ietf.org/mailman/listinfo/bier > > --=20 *We=E2=80=99ve heard that a million monkeys at a million keyboards could pr= oduce the complete works of Shakespeare; now, thanks to the Internet, we know that is not true.* =E2=80=94Robert Wilensky --001a1141a524a1bb2c053d8401eb Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
MPLS carrying this encaps has TTL ...=C2=A0

On Tue, Sep 27, 2016 at 2:= 17 PM, Dino Farinacci <farinacci@gmail.com> wrote:
Hi Dino,

What to follow up on the discussion in this morning's int= erim meeting whether/why BIER-ether may not be=C2=A0liked by DC operators.<= br>
You mentioned that DC operators may only want to work with IP (v4/v6= ) and they want to be able to=C2=A0continue to use IP tools like ping/trace= route.

Right.
To clarify, with BIER-ether it'd still be I= P based: the payload is IP (with IP mcast header) enclosed in=C2=A0

"IP based" means that a BIER message w= ould be *inside* an IP header that was inside an ethertype of 0x0800 or 0x8= 6dd. =E2=80=9CBIER-ether=E2=80=9D means that an ethertype would be allocate= d for a BIER header.

I think from a hardware point= of view, and for vendor efficiency, an ethertype would probably be a good = way to go. But the message to customers is that Bier is a layer-3 protocol = and is not subject to the same forwarding behavior as an L2 switch would pe= rform.

That is =E2=80=9CBier is routable=E2=80=9D,= meaning it is hop by hop forwarding.

BIER enclosed in Ether. IP ping/traceroute will still w= ork, and there will be BIER specific=C2=A0ping/traceroute extensions to fig= ure out the reachability/paths at BIER layer.

If Bier, using this header definition:


was run over it= s own ethertype, would NOT allow traceroute to work. Since traceroute uses = TTL decrement as a procedure to invoke return ICMP messages. The above Bier= header has no TTL.

So you could only use existing= traceroute if there was a IP protocol codepoint for Bier and it run over I= Pv4 and IPv6.

=
Dino

Even if we use BIER-ipv6, there will still be need for BIER spe= cific ping/traceroute tools.

Jeffrey

________________________= _______________________
BIER mailing list
BIER@ietf.org
https://www.ietf.org/mailma= n/listinfo/bier


_______= ________________________________________
BIER mailing list
BIER@ietf.org
https://www.ietf.org/mailman/listinfo/bier




--
=
We=E2=80=99ve heard that a million monkeys at a million keyboards c= ould produce the complete works of Shakespeare; now, thanks to the Internet= , we know that is not true.
= =E2=80=94Robert Wilensky
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[64.134.232.243]) by smtp.gmail.com with ESMTPSA id w35sm2289061qtc.24.2016.09.27.14.36.29 (version=TLS1 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Tue, 27 Sep 2016 14:36:29 -0700 (PDT) Content-Type: text/plain; charset=utf-8 Mime-Version: 1.0 (Mac OS X Mail 9.3 \(3124\)) From: Dino Farinacci In-Reply-To: Date: Tue, 27 Sep 2016 14:36:23 -0700 Content-Transfer-Encoding: quoted-printable Message-Id: <6EA21E85-6A9D-4E94-82AE-50E2103D061D@gmail.com> References: To: Tony Przygienda X-Mailer: Apple Mail (2.3124) Archived-At: Cc: Jeffrey Zhang , "bier@ietf.org" Subject: Re: [Bier] encap in DC X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.17 Precedence: list List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 27 Sep 2016 21:36:33 -0000 Yes, but Jeff was comparing Bier in IP or Bier in Ethernet only. Dino > On Sep 27, 2016, at 2:33 PM, Tony Przygienda = wrote: >=20 > MPLS carrying this encaps has TTL ...=20 >=20 > On Tue, Sep 27, 2016 at 2:17 PM, Dino Farinacci = wrote: >> Hi Dino, >>=20 >> What to follow up on the discussion in this morning's interim meeting = whether/why BIER-ether may not be liked by DC operators. >>=20 >> You mentioned that DC operators may only want to work with IP (v4/v6) = and they want to be able to continue to use IP tools like = ping/traceroute. >=20 > Right. >=20 >> To clarify, with BIER-ether it'd still be IP based: the payload is IP = (with IP mcast header) enclosed in=20 >=20 > "IP based" means that a BIER message would be *inside* an IP header = that was inside an ethertype of 0x0800 or 0x86dd. =E2=80=9CBIER-ether=E2=80= =9D means that an ethertype would be allocated for a BIER header. >=20 > I think from a hardware point of view, and for vendor efficiency, an = ethertype would probably be a good way to go. But the message to = customers is that Bier is a layer-3 protocol and is not subject to the = same forwarding behavior as an L2 switch would perform. >=20 > That is =E2=80=9CBier is routable=E2=80=9D, meaning it is hop by hop = forwarding. >=20 >> BIER enclosed in Ether. IP ping/traceroute will still work, and there = will be BIER specific ping/traceroute extensions to figure out the = reachability/paths at BIER layer. >=20 > If Bier, using this header definition: >=20 > >=20 > was run over its own ethertype, would NOT allow traceroute to work. = Since traceroute uses TTL decrement as a procedure to invoke return ICMP = messages. The above Bier header has no TTL. >=20 > So you could only use existing traceroute if there was a IP protocol = codepoint for Bier and it run over IPv4 and IPv6. >=20 > Dino >=20 >> Even if we use BIER-ipv6, there will still be need for BIER specific = ping/traceroute tools. >>=20 >> Jeffrey >>=20 >> _______________________________________________ >> BIER mailing list >> BIER@ietf.org >> https://www.ietf.org/mailman/listinfo/bier >=20 >=20 > _______________________________________________ > BIER mailing list > BIER@ietf.org > https://www.ietf.org/mailman/listinfo/bier >=20 >=20 >=20 >=20 > --=20 > We=E2=80=99ve heard that a million monkeys at a million keyboards = could produce the complete works of Shakespeare; now, thanks to the = Internet, we know that is not true. > =E2=80=94Robert Wilensky From nobody Tue Sep 27 14:38:17 2016 Return-Path: X-Original-To: bier@ietfa.amsl.com Delivered-To: bier@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id BFB6E12B00D for ; Tue, 27 Sep 2016 14:38:15 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.7 X-Spam-Level: X-Spam-Status: No, score=-2.7 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_LOW=-0.7, SPF_PASS=-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 qsQVsg3lX4A2 for ; Tue, 27 Sep 2016 14:38:13 -0700 (PDT) Received: from mail-qk0-x22d.google.com (mail-qk0-x22d.google.com [IPv6:2607:f8b0:400d:c09::22d]) (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 7562712B221 for ; Tue, 27 Sep 2016 14:38:13 -0700 (PDT) Received: by mail-qk0-x22d.google.com with SMTP id j129so22498643qkd.1 for ; Tue, 27 Sep 2016 14:38:13 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:subject:from:in-reply-to:date:cc :content-transfer-encoding:message-id:references:to; bh=2g0/tOCYc9mfJNjDoAER2D46+deI7x3Sui064bXz2Ko=; b=iGPEHMRuebWp3O7CLgD/HNuFFtmrcnU7Qq7HGyI06OHTUCjEwj0iQEcpfnmKnEhGIj 5aE19IwpicZienCZf2uMaDhPlNSis+atehG4H96JR6/HTiXaBFxK7ucR2GwKTJ+PrEc0 qH7RI+pZ9PXroXEu+BmbNXwhpWaFWeUOPPgusVTEuHiwnVNHfJ/7EtUXv9oeeoRCvpnH gcS0AqmpPZR5Hw1xFXnsc0Fg7RzbGQZfHlS8x6s3LMcFx3zK4NXaCJG3E3EoZlicoHYS vfuDgz7EHPwSZFwLJzEzbMo3vrd202b605JJBdCiIxAMSNAtGBXvj5wgaD4EbvLHpw1g W1AQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:subject:from:in-reply-to:date:cc :content-transfer-encoding:message-id:references:to; bh=2g0/tOCYc9mfJNjDoAER2D46+deI7x3Sui064bXz2Ko=; b=FG4IAXwBFg0iem53hpvo9VehXW+f6n430OtaWvX1CtSPs12kMz8le3VKW446Apu6Oj UWmZcE3ZDuYRIDI3f62nuYlaKT9GsFTwIkvOAO2NBo3g95vicOCsDfdnVwoR4EFc0va3 zapI3C+nGhrWNMvIAmd+O24tQ2X1i5rGfGClwAOlw5sFX2aSxgUGtgfFPS3uL10ZEGqB V3+xlvrokTuCzQciA2dIQdZ4358gv9xO/fe7cpsFvJgUEDWdueAqWGPa/dGquUWGC2+5 epuPTTSwqOb6LkB9m381cyzMwGD+eOkIr3Utq2TKMowWyMDemGFZnSXM6xAl8PWhrGrn q9Uw== X-Gm-Message-State: AA6/9Rnn9BLKGBcGbMm/D3SZNqgVBk8FXL6P0DuaMRggYMSJEMU3S2j66vhn8fV+EYgWpw== X-Received: by 10.55.10.12 with SMTP id 12mr11328214qkk.209.1475012292581; Tue, 27 Sep 2016 14:38:12 -0700 (PDT) Received: from [10.30.1.213] (ip-64-134-232-243.public.wayport.net. [64.134.232.243]) by smtp.gmail.com with ESMTPSA id 44sm2313455qtt.5.2016.09.27.14.38.11 (version=TLS1 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Tue, 27 Sep 2016 14:38:12 -0700 (PDT) Content-Type: text/plain; charset=utf-8 Mime-Version: 1.0 (Mac OS X Mail 9.3 \(3124\)) From: Dino Farinacci In-Reply-To: Date: Tue, 27 Sep 2016 14:38:06 -0700 Content-Transfer-Encoding: quoted-printable Message-Id: References: To: Jeffrey Zhang X-Mailer: Apple Mail (2.3124) Archived-At: Cc: "bier@ietf.org" Subject: Re: [Bier] encap in DC X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.17 Precedence: list List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 27 Sep 2016 21:38:16 -0000 Data centers will have the same reaction to adding another ethertype = forwarding plane, if it is a Bier ethertype or an MPLS ethertype, it = will react the same way.=20 Putting Bier in IP, allows them to keep their core running with two = substrates, a dual-stack substrate, IPv4 and IPv6. Dino > On Sep 27, 2016, at 2:34 PM, Jeffrey (Zhaohui) Zhang = wrote: >=20 > Hi Dino, > =20 > Please see zzh> below. > =20 > From: Dino Farinacci [mailto:farinacci@gmail.com]=20 > Sent: Tuesday, September 27, 2016 5:17 PM > To: Jeffrey (Zhaohui) Zhang > Cc: bier@ietf.org > Subject: Re: [Bier] encap in DC > =20 > Hi Dino, >=20 > What to follow up on the discussion in this morning's interim meeting = whether/why BIER-ether may not be liked by DC operators. >=20 > You mentioned that DC operators may only want to work with IP (v4/v6) = and they want to be able to continue to use IP tools like = ping/traceroute. > =20 > Right. >=20 >=20 > To clarify, with BIER-ether it'd still be IP based: the payload is IP = (with IP mcast header) enclosed in=20 > =20 > "IP based" means that a BIER message would be *inside* an IP header = that was inside an ethertype of 0x0800 or 0x86dd. =E2=80=9CBIER-ether=E2=80= =9D means that an ethertype would be allocated for a BIER header. > =20 > Zzh> To clarify, when I said =E2=80=9CIP based=E2=80=9D I meant that = the payload is still IP (enclosed in BIER then in Ether). With that, = existing IP tools can still be used, and BIER tools will handle BIER = specific things. > =20 > I think from a hardware point of view, and for vendor efficiency, an = ethertype would probably be a good way to go. But the message to = customers is that Bier is a layer-3 protocol and is not subject to the = same forwarding behavior as an L2 switch would perform. > =20 > Zzh> Layer-2.5, sort of like MPLS. The difference from MPLS is that it = does not require MPLS signaling and forwarding. BIER = signaling/forwarding infrastructure is required regardless whether = it=E2=80=99s BIER-mpls or BIER-ipv6 or BIER-ether. > =20 > That is =E2=80=9CBier is routable=E2=80=9D, meaning it is hop by hop = forwarding. > =20 > Zzh> Yes; and tunneling can still be used. >=20 > BIER enclosed in Ether. IP ping/traceroute will still work, and there = will be BIER specific ping/traceroute extensions to figure out the = reachability/paths at BIER layer. > =20 > If Bier, using this header definition: > =20 > > =20 > was run over its own ethertype, would NOT allow traceroute to work. = Since traceroute uses TTL decrement as a procedure to invoke return ICMP = messages. The above Bier header has no TTL. > =20 > Zzh> That is BIER-mpls, and the BIER-label preceding the header has = TTL. There is already a draft on how BIER ping/traceroute is done. > =20 > So you could only use existing traceroute if there was a IP protocol = codepoint for Bier and it run over IPv4 and IPv6. > =20 > Zzh> For BIER-ether, both draft-xu-bier-encapsulation and = draft-wang-bier-ethernet has TTL in the BIER header, and the BIER = ping/traceroute draft based on BIER-mpls can be adapted to BIER-ether as = well. > =20 > Jeffrey > =20 > Dino >=20 >=20 > Even if we use BIER-ipv6, there will still be need for BIER specific = ping/traceroute tools. >=20 > Jeffrey >=20 > _______________________________________________ > BIER mailing list > BIER@ietf.org > https://www.ietf.org/mailman/listinfo/bier From nobody Tue Sep 27 14:59:01 2016 Return-Path: X-Original-To: bier@ietfa.amsl.com Delivered-To: bier@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id E9F4212B32A for ; Tue, 27 Sep 2016 14:59:00 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com 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[64.134.232.243]) by smtp.gmail.com with ESMTPSA id k5sm2352903qtb.9.2016.09.27.15.05.00 (version=TLS1 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Tue, 27 Sep 2016 15:05:00 -0700 (PDT) Content-Type: text/plain; charset=utf-8 Mime-Version: 1.0 (Mac OS X Mail 9.3 \(3124\)) From: Dino Farinacci In-Reply-To: Date: Tue, 27 Sep 2016 15:04:59 -0700 Content-Transfer-Encoding: quoted-printable Message-Id: References: To: Jeffrey Zhang X-Mailer: Apple Mail (2.3124) Archived-At: Cc: "bier@ietf.org" Subject: Re: [Bier] encap in DC X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.17 Precedence: list List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 27 Sep 2016 22:05:05 -0000 The problem is simple from a data center operator point of view. And it = would be stated like this: =E2=80=9CI already run IPv4/IPv6 in my network. I want Bier for = efficient replication and state reduction but I want it on top of IPv4 = and IPv6=E2=80=9D. The above data center operator IS NOT running MPLS. And doesn=E2=80=99t = want to add it to their network. Dino > On Sep 27, 2016, at 2:58 PM, Jeffrey (Zhaohui) Zhang = wrote: >=20 > Hi Dino, >=20 > Not sure if they'd react the same as to MPLS, which requires its own = forwarding infrastructure. As I mentioned below: >=20 >>> Zzh> Layer-2.5, sort of like MPLS. The difference from MPLS is that = it >> does not require MPLS signaling and forwarding. BIER = signaling/forwarding >> infrastructure is required regardless whether it=E2=80=99s BIER-mpls = or BIER-ipv6 >> or BIER-ether. >=20 > Notice that BIER-either does not require additional = signaling/forwarding compared to BIER-ipv6. If an operator does not like = another ethertype, he might also not like having to turn on IPv6 just to = do BIER? >=20 > Jeffrey >=20 >> -----Original Message----- >> From: Dino Farinacci [mailto:farinacci@gmail.com] >> Sent: Tuesday, September 27, 2016 5:38 PM >> To: Jeffrey (Zhaohui) Zhang >> Cc: bier@ietf.org >> Subject: Re: [Bier] encap in DC >>=20 >> Data centers will have the same reaction to adding another ethertype >> forwarding plane, if it is a Bier ethertype or an MPLS ethertype, it = will >> react the same way. >>=20 >> Putting Bier in IP, allows them to keep their core running with two >> substrates, a dual-stack substrate, IPv4 and IPv6. >>=20 >> Dino >>=20 >>> On Sep 27, 2016, at 2:34 PM, Jeffrey (Zhaohui) Zhang = >> wrote: >>>=20 >>> Hi Dino, >>>=20 >>> Please see zzh> below. >>>=20 >>> From: Dino Farinacci [mailto:farinacci@gmail.com] >>> Sent: Tuesday, September 27, 2016 5:17 PM >>> To: Jeffrey (Zhaohui) Zhang >>> Cc: bier@ietf.org >>> Subject: Re: [Bier] encap in DC >>>=20 >>> Hi Dino, >>>=20 >>> What to follow up on the discussion in this morning's interim = meeting >> whether/why BIER-ether may not be liked by DC operators. >>>=20 >>> You mentioned that DC operators may only want to work with IP = (v4/v6) >> and they want to be able to continue to use IP tools like = ping/traceroute. >>>=20 >>> Right. >>>=20 >>>=20 >>> To clarify, with BIER-ether it'd still be IP based: the payload is = IP >> (with IP mcast header) enclosed in >>>=20 >>> "IP based" means that a BIER message would be *inside* an IP header = that >> was inside an ethertype of 0x0800 or 0x86dd. =E2=80=9CBIER-ether=E2=80=9D= means that an >> ethertype would be allocated for a BIER header. >>>=20 >>> Zzh> To clarify, when I said =E2=80=9CIP based=E2=80=9D I meant that = the payload is >> still IP (enclosed in BIER then in Ether). With that, existing IP = tools >> can still be used, and BIER tools will handle BIER specific things. >>>=20 >>> I think from a hardware point of view, and for vendor efficiency, an >> ethertype would probably be a good way to go. But the message to = customers >> is that Bier is a layer-3 protocol and is not subject to the same >> forwarding behavior as an L2 switch would perform. >>>=20 >>> Zzh> Layer-2.5, sort of like MPLS. The difference from MPLS is that = it >> does not require MPLS signaling and forwarding. BIER = signaling/forwarding >> infrastructure is required regardless whether it=E2=80=99s BIER-mpls = or BIER-ipv6 >> or BIER-ether. >>>=20 >>> That is =E2=80=9CBier is routable=E2=80=9D, meaning it is hop by hop = forwarding. >>>=20 >>> Zzh> Yes; and tunneling can still be used. >>>=20 >>> BIER enclosed in Ether. IP ping/traceroute will still work, and = there >> will be BIER specific ping/traceroute extensions to figure out the >> reachability/paths at BIER layer. >>>=20 >>> If Bier, using this header definition: >>>=20 >>> >>>=20 >>> was run over its own ethertype, would NOT allow traceroute to work. >> Since traceroute uses TTL decrement as a procedure to invoke return = ICMP >> messages. The above Bier header has no TTL. >>>=20 >>> Zzh> That is BIER-mpls, and the BIER-label preceding the header has = TTL. >> There is already a draft on how BIER ping/traceroute is done. >>>=20 >>> So you could only use existing traceroute if there was a IP protocol >> codepoint for Bier and it run over IPv4 and IPv6. >>>=20 >>> Zzh> For BIER-ether, both draft-xu-bier-encapsulation and = draft-wang- >> bier-ethernet has TTL in the BIER header, and the BIER = ping/traceroute >> draft based on BIER-mpls can be adapted to BIER-ether as well. >>>=20 >>> Jeffrey >>>=20 >>> Dino >>>=20 >>>=20 >>> Even if we use BIER-ipv6, there will still be need for BIER specific >> ping/traceroute tools. >>>=20 >>> Jeffrey >>>=20 >>> _______________________________________________ >>> BIER mailing list >>> BIER@ietf.org >>> https://www.ietf.org/mailman/listinfo/bier >=20 From nobody Tue Sep 27 15:08:27 2016 Return-Path: X-Original-To: bier@ietfa.amsl.com Delivered-To: bier@ietfa.amsl.com Received: from 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Zhang" To: Dino Farinacci Thread-Topic: [Bier] encap in DC Thread-Index: AdIY9IioXinmRp5YR7aZAVg6zLjUEgAD/loAAAA3WQAAAIPQAAAAFmeQAADZ9IAAAA2T8A== Date: Tue, 27 Sep 2016 22:08:12 +0000 Message-ID: References: In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: spf=none (sender IP is ) smtp.mailfrom=zzhang@juniper.net; x-originating-ip: [66.129.241.10] x-ms-office365-filtering-correlation-id: e5018dc9-7130-4990-9fb8-08d3e722c5c6 x-microsoft-exchange-diagnostics: 1; DM5PR05MB3148; 7:jywe7+30L1nU3XLpy7kefemHP7IZCCX7Ns693wfAdO2dIImul6VGO5taylKuiojmWFPcbWP2Xh116yhUt0a+YinCvslCsVj3nKkqdP4+NWXIkTMG4MvxAZ6lBjh1YEt7GfPIm1wbNcxGIw7NjISPbMQH/w2Uk5ILKIJQ2XyDFBFObWy9PqPeWmVU5wziWHVfZmzxtsSZ14pJqwjKC1l2qbWMocNy8JYnTajmIuxwRag5bLeFogRqRDCcI5XwNHSknoODHPHTZkIN23Siorc1pd5Z6mrWhNXE+/zFKPyei/f7gYoONtg9oazjFrqH/VoZOzlNBfjG8//dlSf5GcmpLQ== x-microsoft-antispam: UriScan:;BCL:0;PCL:0;RULEID:;SRVR:DM5PR05MB3148; x-microsoft-antispam-prvs: 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H:DM5PR05MB3145.namprd05.prod.outlook.com; FPR:; SPF:None; PTR:InfoNoRecords; A:1; MX:1; LANG:en; received-spf: None (protection.outlook.com: juniper.net does not designate permitted sender hosts) spamdiagnosticoutput: 1:99 spamdiagnosticmetadata: NSPM Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 MIME-Version: 1.0 X-OriginatorOrg: juniper.net X-MS-Exchange-CrossTenant-originalarrivaltime: 27 Sep 2016 22:08:12.0423 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: bea78b3c-4cdb-4130-854a-1d193232e5f4 X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM5PR05MB3148 Archived-At: Cc: "bier@ietf.org" Subject: Re: [Bier] encap in DC X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.17 Precedence: list List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 27 Sep 2016 22:08:26 -0000 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X-OriginatorOrg: Mellanox.com X-MS-Exchange-CrossTenant-originalarrivaltime: 28 Sep 2016 07:02:58.2083 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: a652971c-7d2e-4d9b-a6a4-d149256f461b X-MS-Exchange-Transport-CrossTenantHeadersStamped: HE1PR0501MB2140 Archived-At: Cc: "bier@ietf.org" Subject: Re: [Bier] encap in DC X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.17 Precedence: list List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 28 Sep 2016 07:03:18 -0000 QWxzbyB3ZSBmb3VuZCB0aGF0IHRoZSBtaW5pbXVtIDI1NiBiaXRzICBiaXRzcmluZyBpcyBub3Qg dGhhdCBlYXN5IGZyb20gZmxleCBIVyBwb2ludCBvZiB2aWV3ICANCk1vcmUgZmxleGlibGUgb3B0 aW9uIHdpbGwgaGVscCBvbiB0aGF0IGFzIHdlbGwgIA0KDQotLS0tLU9yaWdpbmFsIE1lc3NhZ2Ut LS0tLQ0KRnJvbTogQklFUiBbbWFpbHRvOmJpZXItYm91bmNlc0BpZXRmLm9yZ10gT24gQmVoYWxm 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Cj4gPg0KDQpfX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fXw0K QklFUiBtYWlsaW5nIGxpc3QNCkJJRVJAaWV0Zi5vcmcNCmh0dHBzOi8vd3d3LmlldGYub3JnL21h aWxtYW4vbGlzdGluZm8vYmllcg0K From nobody Wed Sep 28 00:18:46 2016 Return-Path: X-Original-To: bier@ietfa.amsl.com Delivered-To: bier@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 6745F12B337 for ; Wed, 28 Sep 2016 00:18:44 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -6.537 X-Spam-Level: X-Spam-Status: No, score=-6.537 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, RP_MATCHES_RCVD=-2.316, 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 siqiIj9pa-Q2 for ; Wed, 28 Sep 2016 00:18:42 -0700 (PDT) Received: from lhrrgout.huawei.com 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7:isLTD46uza4gsKNVhLxyGYsKaDyWg4IWie+52P4V9gaVtYkLIscyoTmNYKRVlD5r8wHrlThLSEO09mH+jk2x7cR59xI5g6Lyb/dFRwMZXWKll9SZs2Rz2jrBTM6iKNRdIQJMgJ1ozH62ZCjUrHad0K0KCyHd1uZC7j9cRx3cKngd2+8oS6f8MjIu7o+AI+b8OBJYsxwUaFPLZHmg6zQyVlNcmCzdsyP0ir2xAqCHwRDJL6Jk1Vzz82Jx+2LGpARhOs7Az+UZxhPw1rT2XsknqyZtqv/18Ej911XKN50iQuq03FWLKO4iJczykR827zz9yOWNmcpbFgEwIRQB8F4hYQ== X-OriginatorOrg: juniper.net X-MS-Exchange-CrossTenant-OriginalArrivalTime: 28 Sep 2016 14:30:52.9083 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-Transport-CrossTenantHeadersStamped: BY2PR05MB2183 Archived-At: Cc: "bier@ietf.org" Subject: Re: [Bier] =?utf-8?b?562U5aSNOiBlbmNhcCBpbiBEQw==?= X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.17 Precedence: list List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 28 Sep 2016 14:30:57 -0000 On 9/28/2016 3:18 AM, Xuxiaohu wrote: > I'm curious about how to achieve efficient replication and state reduction while running BIER on top of vanilla IPv4 and IPv6. Yes, it would be interesting to know how you get the advantages of BIER if you don't deploy BFRs that provide the BIER forwarding plane. Encapsulating BIER in IPv6 doesn't eliminate the need for the BIER forwarding plane, as Jeffrey has pointed out. Of course, if someone were to insist that IP is the only encapsulation they would consider, one could always put the encapsulation from Figure 1 of draft-xu into an IP packet. The plethora of issues raised by the IPv6 proposal stems from the misguided attempt to carry the BitString in the IP destination address field. Obviously that does not eliminate the need for the BIER forwarding plane and the BIER signaling procedures; in fact it only makes things more complicated. Presumably, making things more complicated is not one of the DC operators' goals. From nobody Wed Sep 28 08:19:16 2016 Return-Path: X-Original-To: bier@ietfa.amsl.com Delivered-To: bier@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 4B06012B18B for ; Wed, 28 Sep 2016 08:19:15 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.7 X-Spam-Level: X-Spam-Status: No, score=-2.7 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_LOW=-0.7, SPF_PASS=-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 XqH3AC7zHlz3 for ; Wed, 28 Sep 2016 08:19:13 -0700 (PDT) Received: from mail-qk0-x22e.google.com (mail-qk0-x22e.google.com [IPv6:2607:f8b0:400d:c09::22e]) (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 725AB12B16E for ; Wed, 28 Sep 2016 08:19:13 -0700 (PDT) Received: by mail-qk0-x22e.google.com with SMTP id t7so50235100qkh.2 for ; Wed, 28 Sep 2016 08:19:13 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:reply-to:from:date:message-id:subject:to; bh=P9vw66iER4VHoAnG5sC5uEc2skLype9NuonM9w5fb/w=; b=XJTlmqZDu882PbUNX1UBFsjXsytGLnREkdSI4El7R2EWpYlrGEMLUYNV9vlmIf5Yzk 9E9CsvZxSRnrErgLcMgdALOSFwhnZBxB58dxOEFitVos4W7LJpU/ZmAyvWSlDb0jWkoV 1NFK55VWsdtpAQFqfW33To7OCM7aHSl6Yu26RpAlHXNUYKevpDwQvX9rfCTk6OJxKrSV mytGWO1mohBZw8ffxSJjGMmJr4V6dhi1CQbXfSKIxDqORFYb5rturqdREE1b77iyAvLA Go1UvKnFqcWLAbgqVocB2k6KvYpWD1qF1+TSisd2J+x4wwqQ6C5b23myF4hFQaQr1KT4 E+2Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:reply-to:from:date:message-id :subject:to; bh=P9vw66iER4VHoAnG5sC5uEc2skLype9NuonM9w5fb/w=; b=KLDANEcxfpsBwGW5j8CqG7zOBuaG3GFkSAsbRSD/ZmrRSKYIVn3KYGk16sz1pWkZLA Nm4rwy0M3VIJL5MfuVGsLTyaveia+9SPysDjB2j+gr6W9dOig/iDcjme8FYiH1bJAbFX 0v+gcbC8purSxsIutf6MAoF4P4VjMz6wiA9MCh8arsR1eAyTaShcLiEMD/CR41hSZxQS 7D7D67AeWPRoPdM2Q2uU4QmjxagjV/SHiQiwYGkq0JK8/ozZCPNYAwExV94Del2qtktP pZsgrUJd6qm43Ft1NS8KjmZZdPstCBebIIGeNQXQ/vOJcg8+Om8uwwcuBpi/s0HjTO9c Os8Q== X-Gm-Message-State: AA6/9RnB7tWoM2e4SJ1sZOQrz6CxMx8uZfHV4s2EB0KjVLuMoPtqyYoFPTWgvzsDpDeR648gHrrmdV28iQ7LOA== X-Received: by 10.55.144.71 with SMTP id s68mr24729319qkd.290.1475075952394; Wed, 28 Sep 2016 08:19:12 -0700 (PDT) MIME-Version: 1.0 Received: by 10.200.52.17 with HTTP; Wed, 28 Sep 2016 08:19:11 -0700 (PDT) From: Greg Shepherd Date: Wed, 28 Sep 2016 08:19:11 -0700 Message-ID: To: "bier@ietf.org" Content-Type: text/plain; charset=UTF-8 Archived-At: Subject: [Bier] Interim WG Day 1 minutes X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.17 Precedence: list Reply-To: gjshep@gmail.com List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 28 Sep 2016 15:19:15 -0000 shep: Agenda linda: add draft-wang-bier-ethernet all: accepted shep: status tony: encaps must stand the test of time. shep: new encaps can be added shep: separate; arch, encap, encode. tony: orthogonal tony: encode is important for HW. shep: charter - one more encap because it's experimental. push back on charter for another? justify going to standards, then what is the encap that gives us customer uptake and path to standards track. shep: current status MPLS: use-cases covered: mvpn. DETNET, EVPM, IPTV. MLDP-in-band signalling. use-cases not covered. DC:(storage, VXLAN). Enterprise homenet - (Dino,Tony:mcast DV in babel) stig: should we force deployments to have MPLS? shep: not about forcing it's about finding another encap to meet as many deployments as possible. UDP: dst-port=BIER, src-port:entropy. equivalent to BIER ehtertype. imposed hop-by-hop => no check-sums. BIER hdr not too deep in pkt. Dino: DC is 4 and 6 only. Dino. BIER server to server in DC. leafs do BIER, spoine does not. does that require BIER over IP. tunnels are evil. shep: dynamic overlay. tony: arch supports auto tunneling through non-supported node. lunch break Sandy: presents VXLAN. ice: draft for MLD membership. good for samll deployments dino: overlay signalling must scale. ice: use BGP for scale. shep: BIER does not dictate membership signalling. shep: Ice and Sandy to collaborate on future MLD draft. Linda: BIER-ethernet draft. shep: consider draft-xu-bier dino: many fields same as IP header tony: BS,SD, BSL, should not be in the packet - it's CP info. don't couple them. dino: in BIER unicast is a special case of multicast. all: agree new next-hop proto registry. tony & Ice; same capabilities as BIER-MPLS plus 6-bit DS. toerless: is there a technical argument for I and SD in the header .... silence. Pierre: IPv6 Encap. dino: can you reconstruct a v6 mcast addr at the BFER? pierre: yes, mcast addr only few sig-bits. copy them to the end. alia: what are the reasons for this IPv6 mechanism over others. From nobody Wed Sep 28 08:22:05 2016 Return-Path: X-Original-To: bier@ietfa.amsl.com Delivered-To: bier@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 463D612B1B1 for ; Wed, 28 Sep 2016 08:22:04 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.699 X-Spam-Level: X-Spam-Status: No, score=-2.699 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-0.7, SPF_PASS=-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 hrBVfSUbw5to for ; Wed, 28 Sep 2016 08:21:59 -0700 (PDT) Received: from mail-qk0-x22d.google.com (mail-qk0-x22d.google.com [IPv6:2607:f8b0:400d:c09::22d]) (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 88E9D12B1C2 for ; Wed, 28 Sep 2016 08:21:51 -0700 (PDT) Received: by mail-qk0-x22d.google.com with SMTP id j129so42409111qkd.1 for ; Wed, 28 Sep 2016 08:21:51 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:reply-to:in-reply-to:references:from:date:message-id :subject:to; bh=iVR05jIbagt8a9FW5NgqTy4OfqrCMlsHVxFvwY3KCxI=; b=XCAw2QSAeOtPV6a0FQ03S41JSdQfw8YgfzGDbHssnF5caXBfx/qRY1yFZn8OaqmW5q WqzrfwHOAEB36/d3hgtPQjLFtNYkKGF4ol/hJ2+pK/CzWWapxmGDuXNA0WgcpjLIXWau 0436NRoQzXKLuWaVn26IVNk2cenYv2OePX1u7SL6JzkqWKWQh7lb3rZZGlSOI+N5BU7U 4dSeyfHO46aIMNIVPBmjGXOB+OtlmVTGWoiWPLeWCtd9pnhk2Kp7t/ncOwE4wQLmgWDD uH4q3nXn8SeVfUGQg9BtN+jxL94nbArxJJSu5lAeb7YXpViOU7rdPnTF12Ul6mR6cgTs q/mw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:reply-to:in-reply-to:references :from:date:message-id:subject:to; bh=iVR05jIbagt8a9FW5NgqTy4OfqrCMlsHVxFvwY3KCxI=; b=MZd2TEVK+/YtmJI3SbZ0mtCE169E+Posx2OeTPhqQytncEuTjj8ZXRzFw1VxMsQObm 0tkF74Nj1oYcpjWx8Vt8Fcj+HJ52r8jGU95XxuzHRKBZ0TgGivgG5QWUM5uRuAr3ANy/ wtmi1wIcbiqXdUZzFnXc8MjsDUw3k6QM0Ju1Qi1yM457fZ2VXeUFMB+7OcsQFOaYjmTt EToIUVCGOl5RZKVmMbqV8OfjpRLChzKYr+QT112JaViAjhSFn7lxbE0hvj0Evjib+TkK o8ch7ECdvVKfLSUFjSmqVFSRen9+3OvkAoWqZflmJ6t56CFs/99B81BiZlm9/H8WcYQk wggg== X-Gm-Message-State: AA6/9RlEw3PoJy/NrtukTatlvbgwemgYR8zTQ7yGC39qImt+ehk76VAge7lrKMUdTumEI0qMwHirQs6t6qedzQ== X-Received: by 10.55.144.71 with SMTP id s68mr24744698qkd.290.1475076110643; Wed, 28 Sep 2016 08:21:50 -0700 (PDT) MIME-Version: 1.0 Received: by 10.200.54.181 with HTTP; Wed, 28 Sep 2016 08:21:50 -0700 (PDT) In-Reply-To: <1012366121.341761475076061302.JavaMail.nobody@rsj6rmd001.webex.com> References: <1012366121.341761475076061302.JavaMail.nobody@rsj6rmd001.webex.com> From: Greg Shepherd Date: Wed, 28 Sep 2016 08:21:50 -0700 Message-ID: To: "bier@ietf.org" Content-Type: multipart/alternative; boundary=94eb2c083a88977b25053d92ebd3 Archived-At: Subject: [Bier] Fwd: WebEx recording is available for viewing: BIER WG Interim-20160927 1728-1 X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.17 Precedence: list Reply-To: gjshep@gmail.com List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 28 Sep 2016 15:22:04 -0000 --94eb2c083a88977b25053d92ebd3 Content-Type: text/plain; charset=UTF-8 Day 1 recording: ---------------------- Hello, Gregory Shepherd wants to share this WebEx recording with you. *BIER WG Interim-20160927 1728-1* Tuesday, September 27, 2016 6:08 pm | Pacific Daylight Time (San Francisco, GMT-07:00) *Play recording* (5 hr) Recording password: 6hAv5F2U --94eb2c083a88977b25053d92ebd3 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
Day 1 recording:
-----------= -----------
=20
Hello,
Gregory Shepherd wants to share this WebEx recording with y= ou.
=09
=C2= =A0
BIER WG Interim-20160927 1728-1
Tuesday, September 27, 2016
6:08 pm=C2=A0=C2=A0|=C2=A0=C2=A0Pacific Daylight Time (San Fra= ncisco, GMT-07:00)
=C2= =A0
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--94eb2c083a88977b25053d92ebd3-- From nobody Wed Sep 28 09:15:23 2016 Return-Path: X-Original-To: bier@ietfa.amsl.com Delivered-To: bier@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 8068012B203 for ; Wed, 28 Sep 2016 09:15:21 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.699 X-Spam-Level: X-Spam-Status: No, score=-2.699 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-0.7, SPF_PASS=-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 T9CiFBP2vLkI for ; Wed, 28 Sep 2016 09:15:19 -0700 (PDT) Received: from mail-io0-x230.google.com (mail-io0-x230.google.com [IPv6:2607:f8b0:4001:c06::230]) (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 D47FA12B219 for ; Wed, 28 Sep 2016 09:15:12 -0700 (PDT) Received: by mail-io0-x230.google.com with SMTP id 92so67039122iol.2 for ; Wed, 28 Sep 2016 09:15:12 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc; bh=b67SJEoCkDnJ6I+tcN9tSt4VUrqGxInQckzAEJSIxJ8=; b=YPjKjt7M6xhE4za8yAk64R5Lq+F6qJ0tZLErW16Ur4wP4EyAsRjKCNcWq8G8YJkUTH hr+P4bhRfHsmpRH+qzm38pejl+bGV1b2fGhIzjHlEW7zf5WKeQCyK/zIUjSAOOqhUDfU zXK2tyMaX4RKDvUC/CHGiy5kdLxl3r/LvkKYTUmu6X6Hpwv1ork3Xq4E+/AChiuC7iWQ dbzzlux7n2eMNeVHgckzLwQFYyStsoVwLPrKKIFGWlWIM3/sNLSrhE00gQngjAx3NEHv PA95fRluiCpJCIPDxQPu/FH02hKlewz0gp+8VzXheh01pO/qaQxprndckf67N8nDKZTF ViSw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to:cc; bh=b67SJEoCkDnJ6I+tcN9tSt4VUrqGxInQckzAEJSIxJ8=; b=kU77txinEt2wQgnTbx2YethKGTknAa0RKNz3euHUpAHtUCSn8/qZATYiLmUbFItkwr YYMVkfToqMlrC/SI+bEfG+k2wO4km7QRfBsm7phwujzdW6NX/UztJvo+4DZIlQTkY5d6 AwhZOKZ0brXfP8ycAFlGt7TkWv7TqMAXeJ1B3KATx0gQdTYNuYoeXKNs2bJ9ArgEpFmE rynCZz7GfEKHDAW6RS3tsWIMW5v0MwgRgzW1UaQDwPQNxxomDFwXvovR/y58MJcxVrbm 2eIebZhUoqV1fICAURsRKOfnculuc/hcI1v10KbMYMEHsKK9TULNqa9RUeitoEq6agY3 VX8w== X-Gm-Message-State: AA6/9RnF0nLyXb/+Frtfpzk7CiX1Qh+RgUFq+nImjUow+M2F2bPPdW0cL2ILqLYQXxpTTkDRo1WIbxhVx2WnHw== X-Received: by 10.107.132.231 with SMTP id o100mr11433078ioi.109.1475079312118; Wed, 28 Sep 2016 09:15:12 -0700 (PDT) MIME-Version: 1.0 Received: by 10.107.158.82 with HTTP; Wed, 28 Sep 2016 09:14:31 -0700 (PDT) In-Reply-To: References: From: Tony Przygienda Date: Wed, 28 Sep 2016 09:14:31 -0700 Message-ID: To: Greg Shepherd Content-Type: multipart/alternative; boundary=001a113ebf546a3c34053d93aa9d Archived-At: Cc: "bier@ietf.org" Subject: Re: [Bier] Interim WG Day 1 minutes X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.17 Precedence: list List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 28 Sep 2016 16:15:21 -0000 --001a113ebf546a3c34053d93aa9d Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Blue sheet Day 1: Greg S/CSCO Tony P/JNPR Linda, Sandy/ZTE Pierre Pfister/CSCO Stig Venaas/CSCO Nagendra Kumar/CSCO Mahesh Shivkumar Jeffrey Z./JNPR Ice/CSCO Greg Mirsky/? Alia/JNPR Jeff T/? Toerless/? Dino/? Neale Ranns/CSCO On Wed, Sep 28, 2016 at 8:19 AM, Greg Shepherd wrote: > shep: Agenda > linda: add draft-wang-bier-ethernet > all: accepted > > shep: status > tony: encaps must stand the test of time. > shep: new encaps can be added > shep: separate; arch, encap, encode. > tony: orthogonal > tony: encode is important for HW. > > shep: charter - one more encap because it's experimental. push back on > charter for another? > justify going to standards, then > what is the encap that gives us customer uptake and path to standards > track. > > shep: current status > MPLS: > use-cases covered: > mvpn. DETNET, EVPM, IPTV. MLDP-in-band signalling. > > use-cases not covered. > DC:(storage, VXLAN). > Enterprise > homenet - (Dino,Tony:mcast DV in babel) > > stig: should we force deployments to have MPLS? > shep: not about forcing it's about finding another encap to meet as > many deployments as possible. > > UDP: dst-port=3DBIER, src-port:entropy. equivalent to BIER > ehtertype. imposed hop-by-hop =3D> no check-sums. BIER hdr not too deep > in pkt. > > Dino: DC is 4 and 6 only. > Dino. BIER server to server in DC. leafs do BIER, spoine does > not. does that require BIER over IP. tunnels are evil. > shep: dynamic overlay. > tony: arch supports auto tunneling through non-supported node. > > lunch break > > Sandy: presents VXLAN. > ice: draft for MLD membership. good for samll deployments > dino: overlay signalling must scale. > ice: use BGP for scale. > shep: BIER does not dictate membership signalling. > shep: Ice and Sandy to collaborate on future MLD draft. > > Linda: BIER-ethernet draft. > shep: consider draft-xu-bier > dino: many fields same as IP header > tony: BS,SD, BSL, should not be in the packet - it's CP > info. don't couple them. > dino: in BIER unicast is a special case of multicast. > all: agree new next-hop proto registry. > tony & Ice; same capabilities as BIER-MPLS plus 6-bit DS. > toerless: is there a technical argument for I and SD in the header > .... silence. > > Pierre: IPv6 Encap. > dino: can you reconstruct a v6 mcast addr at the BFER? > pierre: yes, mcast addr only few sig-bits. copy them to the end. > alia: what are the reasons for this IPv6 mechanism over others. > > _______________________________________________ > BIER mailing list > BIER@ietf.org > https://www.ietf.org/mailman/listinfo/bier > --=20 *We=E2=80=99ve heard that a million monkeys at a million keyboards could pr= oduce the complete works of Shakespeare; now, thanks to the Internet, we know that is not true.* =E2=80=94Robert Wilensky --001a113ebf546a3c34053d93aa9d Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
Blue sheet Day 1:=C2=A0

Greg = S/CSCO
Tony P/JNPR
Linda, Sandy= /ZTE
Pierre Pfister/CSCO
Stig = Venaas/CSCO
Nagendra Kumar/CSCO
Mahesh Shivkumar
Jeffrey Z./JNPR
Ice/CSCO
Greg Mirsky/?
Alia/JNPR
Jeff T/?
Toerle= ss/?
Dino/?
<= span class=3D"gmail-author-a-z69zhz78zka7z83zz74zpz77zebafz90zz68z" style= =3D"margin:0px;padding:1px 0px;background-color:rgb(199,255,213)">Neale Ran= ns/CSCO


=
On Wed, Sep 28, 2016 at 8:19 AM, Greg Shepherd <= span dir=3D"ltr"><= gjshep@gmail.com> wrote:
sh= ep: Agenda
=C2=A0linda: add draft-wang-bier-ethernet
all: accepted

shep: status
=C2=A0tony: encaps must stand the test of time.
=C2=A0shep: new encaps can be added
=C2=A0shep: separate; arch, encap, encode.
=C2=A0 tony: orthogonal
=C2=A0 tony: encode is important for HW.

shep: charter - one more encap because it's experimental. push back on<= br> charter for another?
justify going to standards, then
what is the encap that gives us customer uptake and path to standards track= .

shep: current status
=C2=A0MPLS:
=C2=A0use-cases covered:
=C2=A0 mvpn. DETNET, EVPM, IPTV. MLDP-in-band signalling.

=C2=A0use-cases not covered.
=C2=A0 =C2=A0DC:(storage, VXLAN).
=C2=A0 =C2=A0Enterprise
=C2=A0 =C2=A0homenet - (Dino,Tony:mcast DV in babel)

stig: should we force deployments to have MPLS?
shep: not about forcing it's about finding another encap to meet as
many deployments as possible.

UDP: dst-port=3DBIER, src-port:entropy. equivalent to BIER
ehtertype. imposed hop-by-hop =3D> no check-sums. BIER hdr not too deep<= br> in pkt.

Dino: DC is 4 and 6 only.
Dino. BIER server to server in DC. leafs do BIER, spoine does
not. does that require BIER over IP. tunnels are evil.
shep: dynamic overlay.
tony: arch supports auto tunneling through non-supported node.

lunch break

Sandy: presents VXLAN.
ice: draft for MLD membership. good for samll deployments
dino: overlay signalling must scale.
ice: use BGP for scale.
shep: BIER does not dictate membership signalling.
shep: Ice and Sandy to collaborate on future MLD draft.

Linda: BIER-ethernet draft.
=C2=A0shep: consider draft-xu-bier
=C2=A0dino: many fields same as IP header
=C2=A0tony: BS,SD, BSL, should not be in the packet - it's CP
=C2=A0info. don't couple them.
=C2=A0dino: in BIER unicast is a special case of multicast.
=C2=A0all: agree new next-hop proto registry.
=C2=A0tony & Ice; same capabilities as BIER-MPLS plus 6-bit DS.
=C2=A0toerless: is there a technical argument for I and SD in the header =C2=A0.... silence.

Pierre: IPv6 Encap.
=C2=A0dino: can you reconstruct a v6 mcast addr at the BFER?
=C2=A0 =C2=A0pierre: yes, mcast addr only few sig-bits. copy them to the en= d.
alia: what are the reasons for this IPv6 mechanism over others.

_______________________________________________
BIER mailing list
BIER@ietf.org
https://www.ietf.org/mailman/listinfo/bier



--
We=E2=80=99ve heard that a million monkeys at a million keyboards cou= ld produce the complete works of Shakespeare; now, thanks to the Internet, = we know that is not true.=E2=80=94Robert Wilensky<= br>
--001a113ebf546a3c34053d93aa9d-- From nobody Wed Sep 28 12:09:54 2016 Return-Path: X-Original-To: bier@ietfa.amsl.com Delivered-To: bier@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 0BB7D12B347 for ; Wed, 28 Sep 2016 12:09:53 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2 X-Spam-Level: X-Spam-Status: No, score=-2 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_FROM=0.001, SPF_PASS=-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 zA_HnM_oOETN for ; Wed, 28 Sep 2016 12:09:51 -0700 (PDT) Received: from mail-qt0-x229.google.com (mail-qt0-x229.google.com [IPv6:2607:f8b0:400d:c0d::229]) (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 80CF912B28B for ; Wed, 28 Sep 2016 12:09:02 -0700 (PDT) Received: by mail-qt0-x229.google.com with SMTP id r60so11839598qtd.3 for ; Wed, 28 Sep 2016 12:09:02 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:subject:from:in-reply-to:date:cc :content-transfer-encoding:message-id:references:to; bh=yDWRYZrznDzruy/y7KdKp1KtumUO3wdGdKndADiosko=; b=y37N2OOFGyNb23pmOEILQH6tVKl7F/1BW0Nl8/XyDoGQvuT5lF4PgPKYpbFx8XeTcy 521iUPcmOe6aYNf5L2nedI/+O/LGllfFrgXExXuNMBXZj2Xv+dqifaF46YJZ2HWFRkVc 6+Y6KUIxNyRLBE+CjjNrA/tCkLg7xMRUjds3NLl9lT567SUta4ei6QgJWaSnd6UURF/b dYovR+eTFcmFei26DcWFlrcWUKLJR6KY44Z8l/aU52JDlNFqHLhqjyoE8SdgZv8pfhVl RLVCA9msCLyTptXDIRBWKEtvJeUg85tatDmDFeW3amEItA0MPKB9S3riak12xTtZTQFT AIyw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:subject:from:in-reply-to:date:cc :content-transfer-encoding:message-id:references:to; bh=yDWRYZrznDzruy/y7KdKp1KtumUO3wdGdKndADiosko=; b=SSjPQLWDryFt/nz2WYNZ0ISlD8nbEc8LwjerXyWO/Ezy97mb05wwTywOJxoW0Jd7hM 60X4JVFUmWvg6t+jHs0jemguaqIK785nByK1RWovpEeLr+eAfPuItVC3edFxRpsbB06V /CWosHeJxua4haVDQA5qxG1xyj0v5o9upiOzxslz5VM41H3pH0GH2tEQnFXYR/3gonUZ WKtLfmhSqtQYiNbgXKMiJ+H/Voo4L1XqDuT3uZGti+v8ncZ/J/pSRQDKsiQhZTMWpjKY hqvoFJezwh4gBWiERcfYf4uv1PgB+3xIUrul47Xson8FkhxsHhLmTjhOigZQz0TmnfZ4 X7IQ== X-Gm-Message-State: AA6/9Rl4q6M4ZLcrfRnNAln6DlCfvt2B5k9zuvrmjHCj6sotqLjayPiUL2toZBZmIQySKw== X-Received: by 10.237.47.162 with SMTP id m31mr35288374qtd.55.1475089741637; Wed, 28 Sep 2016 12:09:01 -0700 (PDT) Received: from [10.31.1.71] (ip-64-134-222-71.public.wayport.net. [64.134.222.71]) by smtp.gmail.com with ESMTPSA id p124sm4541586qkd.40.2016.09.28.12.09.00 (version=TLS1 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Wed, 28 Sep 2016 12:09:01 -0700 (PDT) Content-Type: text/plain; charset=us-ascii Mime-Version: 1.0 (Mac OS X Mail 9.3 \(3124\)) From: Dino Farinacci In-Reply-To: <5a1538f4-6dc2-2005-e8d0-8fa2e4dbc10c@juniper.net> Date: Wed, 28 Sep 2016 12:08:55 -0700 Content-Transfer-Encoding: quoted-printable Message-Id: References: <1FEE3F8F5CCDE64C9A8E8F4AD27C19EE2BB1ED29@NKGEML515-MBX.china.huawei.com> <5a1538f4-6dc2-2005-e8d0-8fa2e4dbc10c@juniper.net> To: Eric C Rosen X-Mailer: Apple Mail (2.3124) Archived-At: Cc: Jeffrey Zhang , Xuxiao Hu , "bier@ietf.org" Subject: Re: [Bier] =?utf-8?b?562U5aSNOiBlbmNhcCBpbiBEQw==?= X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.17 Precedence: list List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 28 Sep 2016 19:09:53 -0000 > On 9/28/2016 3:18 AM, Xuxiaohu wrote: >> I'm curious about how to achieve efficient replication and state = reduction while running BIER on top of vanilla IPv4 and IPv6. >=20 > Yes, it would be interesting to know how you get the advantages of = BIER if you don't deploy BFRs that provide the BIER forwarding plane. = Encapsulating BIER in IPv6 doesn't eliminate the need for the BIER = forwarding plane, as Jeffrey has pointed out. Yes, you have to deploy BFRs. The question is what header should be used = to convey BitString info. > Of course, if someone were to insist that IP is the only encapsulation = they would consider, one could always put the encapsulation from Figure = 1 of draft-xu into an IP packet. The plethora of issues raised by the = IPv6 proposal stems from the misguided attempt to carry the BitString in = the IP destination address field. Obviously that does not eliminate the = need for the BIER forwarding plane and the BIER signaling procedures; in = fact it only makes things more complicated. Presumably, making things = more complicated is not one of the DC operators' goals. Agree 100%. Dino From nobody Wed Sep 28 18:47:21 2016 Return-Path: X-Original-To: bier@ietfa.amsl.com Delivered-To: bier@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 6944B12B0E1; Wed, 28 Sep 2016 18:47:20 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -4.215 X-Spam-Level: X-Spam-Status: No, score=-4.215 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.001, RP_MATCHES_RCVD=-2.316] 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 hXx3wFNYu1zE; Wed, 28 Sep 2016 18:47:19 -0700 (PDT) Received: from faui40.informatik.uni-erlangen.de (faui40.informatik.uni-erlangen.de [IPv6:2001:638:a000:4134::ffff:40]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 117A312B097; Wed, 28 Sep 2016 18:47:19 -0700 (PDT) Received: from faui40p.informatik.uni-erlangen.de (faui40p.informatik.uni-erlangen.de [IPv6:2001:638:a000:4134::ffff:77]) by faui40.informatik.uni-erlangen.de (Postfix) with ESMTP id BD90058C4B5; Thu, 29 Sep 2016 03:47:17 +0200 (CEST) Received: by faui40p.informatik.uni-erlangen.de (Postfix, from userid 10463) id A76F6B0A989; Thu, 29 Sep 2016 03:47:17 +0200 (CEST) Date: Thu, 29 Sep 2016 03:47:17 +0200 From: Toerless Eckert To: "bier@ietf.org" , draft-ietf-bier-use-cases@ietf.org Message-ID: <20160929014717.GB29612@faui40p.informatik.uni-erlangen.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.5.21 (2010-09-15) Archived-At: Subject: [Bier] draft-ietf-bier-use-cases: BUM use-case questions considerations X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.17 Precedence: list List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 29 Sep 2016 01:47:21 -0000 During the BIER interim, we discussed the VXLAM BUM use case for BIER. This would be similar to the EVPN use-case mentioned in the use-case draft. Q: Should VXLAN be added beside EVPN to the use case draft ? Q: I haven't tried to read up on EVPN in detail: Is EVPN always "broadcasting" Unknown packets ? Isn't there a signaling option as well ? Ask: If would be great if the description of the use-case would consider example scale considerations, eg: Can we predict if, and how efficient BIER would be ? That efficiency is somrthin i am mostly worried about: - Data centers may have as much as 10,000 TORs. Which i guess would be the BFER. 256 BitString length == 40 SIs. Aka: Worst case, if i have randomn allocation of 10,000 BFR-IDs, i would need to send up to 40 BIER packets for a BUM packet. - Would VLANs have randomnly distributed VMs associated with them ? If not, eg: if they would stay usually within smaller PODs, that would be good to describe in the use-case text. - Would i achieve better replication efficiency if i would start to plan the bits more, eg: instead of SI use subdomains for PODs or the like... Aka: without being able to examplify the efficiency we can achieve with BIER for this BUM use case its really hard to predict how useful it would be for this use-case! Cheers Toerless From nobody Wed Sep 28 19:55:22 2016 Return-Path: X-Original-To: bier@ietfa.amsl.com Delivered-To: bier@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 7B26612B058; Wed, 28 Sep 2016 19:55:20 -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, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_PASS=-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 RFVkO_CnQZNd; Wed, 28 Sep 2016 19:55:18 -0700 (PDT) Received: from mail-it0-x22a.google.com (mail-it0-x22a.google.com [IPv6:2607:f8b0:4001:c0b::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 A304512B008; Wed, 28 Sep 2016 19:55:18 -0700 (PDT) Received: by mail-it0-x22a.google.com with SMTP id x192so2811015itb.0; Wed, 28 Sep 2016 19:55:18 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc; bh=Z53e48f7Gk1Ldt5QzWZ+Pl7zT+mjtVW4jyanmmnWfWs=; b=HJLogh3HtueEXpkDwNiE+RrbL+wdWvALRuEv++aof3lobO/kDE0ro4n/UBlMmdjlw+ nDClmqz3+5Cd1Shsemqla3GeCt3jF0qj2vFgUpoysRQh4ompNUN96stfL5oMN/7sT6PG ab+mJWZ3Rpg0xrLFQYpmzsI6KU3+eI7xNijY5vVeh2usfJtA4Bg7Qw59fKvdyTISlGFj N0lq9QNowCj12sEV7MGn1O4KHM4c2aSXYTKwoME1sCBekAMwTon3xv0iz6YAD4abk08d fGxdVPBsq+fxPIuOATkYOPcwr1tz6ioJ5ZzJtS0pjzM26+ny6pkFiZekUP1itWhgJmeb FcbA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to:cc; bh=Z53e48f7Gk1Ldt5QzWZ+Pl7zT+mjtVW4jyanmmnWfWs=; b=eF4oOzh1EQV2/PI/7DuS/8EbQ8ZJ0A0aU7MotQyiegCWOlIb8vK/qFnWNJkB2n3JZt CuoY1O7w+kRxkhuBA8KS5lhG6xN4b0ZYGLXzgCypjTHFDwbkRI4IVJKwBM0NPYp8MLw4 LhZJVx1x3qAdmBbs86eBTrOUc1x67NBfYaEepe0f0l4KhfhsGcyDuB9j8ktdpzFhH0Cn MQgm0shywsxMYmmxlken8Jw1ob/2OFG1i2yLTa0wlGl2LjS532g5yleQL40AJoMN7K4g obrkcShZK7CFkDWMYTdK0zx0d+2H2tQFbyN7UbOoXIKD5KA4ca6fh4aUZgfMPz/O2JfF jbyw== X-Gm-Message-State: AA6/9RlaxzzPsfjX0xGGsAKLzRfcvLzcJeDCvtK19zHb2xtx84OZXRJvC1TF/K1VVw+GBxTFYenvi7Ow0Tc7Jg== X-Received: by 10.36.51.206 with SMTP id k197mr447936itk.37.1475117717946; Wed, 28 Sep 2016 19:55:17 -0700 (PDT) MIME-Version: 1.0 Received: by 10.107.158.82 with HTTP; Wed, 28 Sep 2016 19:54:37 -0700 (PDT) In-Reply-To: <20160929014717.GB29612@faui40p.informatik.uni-erlangen.de> References: <20160929014717.GB29612@faui40p.informatik.uni-erlangen.de> From: Tony Przygienda Date: Wed, 28 Sep 2016 19:54:37 -0700 Message-ID: To: Toerless Eckert Content-Type: multipart/alternative; boundary=001a1144dfd094898e053d9c9bbd Archived-At: Cc: "bier@ietf.org" , draft-ietf-bier-use-cases@ietf.org Subject: Re: [Bier] draft-ietf-bier-use-cases: BUM use-case questions considerations X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.17 Precedence: list List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 29 Sep 2016 02:55:20 -0000 --001a1144dfd094898e053d9c9bbd Content-Type: text/plain; charset=UTF-8 On Wed, Sep 28, 2016 at 6:47 PM, Toerless Eckert wrote: > During the BIER interim, we discussed the VXLAM BUM use case for BIER. > This would be similar to the EVPN use-case mentioned in the use-case draft. > > Q: Should VXLAN be added beside EVPN to the use case draft ? > IMO yes ... > > Q: I haven't tried to read up on EVPN in detail: Is EVPN always > "broadcasting" Unknown packets ? Isn't there a signaling option as well ? > it does for BU_, for multicast a solution is currently worked on. Overlay signaling for EVPN multicast with BIER has already been proposed. > > Ask: If would be great if the description of the use-case would consider > example scale considerations, eg: Can we predict if, and how efficient > BIER would be ? > There are numbers I saw from providers but I'm not free to disclose them. They looked pretty impressive @ 256 bit mask. > > That efficiency is somrthin i am mostly worried about: > > - Data centers may have as much as 10,000 TORs. Which i guess would be > the BFER. 256 BitString length == 40 SIs. Aka: Worst case, if i have > randomn allocation of 10,000 BFR-IDs, i would need to send up to > 40 BIER packets for a BUM packet. > 40 copies to serve 10K destinations is 99.6% compression rate. Your complaint being? > - Would VLANs have randomnly distributed VMs associated with them ? > If not, eg: if they would stay usually within smaller PODs, that would > be good to describe in the use-case text. > - Would i achieve better replication efficiency if i would start > to plan the bits more, eg: instead of SI use subdomains for PODs or > the like... > which we have the architecture for ... 255 subdomain should give you pretty good scaling if you exploit the locality on the topology. Inter-subdomain forwarding is a different issue outside BIER scope for the moment I'd say ... -- tony --001a1144dfd094898e053d9c9bbd Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable


On Wed, Sep 28, 2016 at 6:47 PM, Toerless Eckert <= tte+ietf@cs.fau.de<= /a>> wrote:
During the BIER int= erim, we discussed the VXLAM BUM use case for BIER.
This would be similar to the EVPN use-case mentioned in the use-case draft.=

Q: Should VXLAN be added beside EVPN to the use case draft ?

IMO yes ...=C2=A0
=C2=A0

Q: I haven't tried to read up on EVPN in detail: Is EVPN always
"broadcasting" Unknown packets ? Isn't there a signaling opti= on as well ?

it does for BU_, for multi= cast a solution is currently worked on. Overlay signaling for EVPN multicas= t with BIER has already been proposed.=C2=A0
=C2=A0

Ask: If would be great if the description of the use-case would consider example scale considerations, eg: Can we predict if, and how efficient
BIER would be ?

There are numbers I saw= from providers but I'm not free to disclose them. They looked pretty i= mpressive @ 256 bit mask.=C2=A0
=C2=A0

That efficiency is somrthin i am mostly worried about:

- Data centers may have as much as 10,000 TORs. Which i guess would be
=C2=A0 the BFER. 256 BitString length =3D=3D 40 SIs. Aka: Worst case, if i = have
=C2=A0 randomn allocation of 10,000 BFR-IDs, i would need to send up to
=C2=A0 40 BIER packets for a BUM packet.

40 copies to serve 10K destinations is =C2=A099.6% compression rate. Your= complaint being?
- Would VLANs have randomnly distributed VMs associated with them ?
=C2=A0 If not, eg: if they would stay usually within smaller PODs, that wou= ld
=C2=A0 be good to describe in the use-case text.
- Would i achieve better replication efficiency if i would start
=C2=A0 to plan the bits more, eg: instead of SI use subdomains for PODs or<= br> =C2=A0 the like...


--001a1144dfd094898e053d9c9bbd-- From nobody Thu Sep 29 06:39:36 2016 Return-Path: X-Original-To: bier@ietfa.amsl.com Delivered-To: bier@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 3085712B0CC; Thu, 29 Sep 2016 06:39:35 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -102.699 X-Spam-Level: X-Spam-Status: No, score=-102.699 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-0.7, SPF_PASS=-0.001, USER_IN_WHITELIST=-100] 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 AIeUJcKcrOUL; Thu, 29 Sep 2016 06:39:31 -0700 (PDT) Received: from mail-yw0-x22a.google.com (mail-yw0-x22a.google.com [IPv6:2607:f8b0:4002:c05::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 06B0112B093; Thu, 29 Sep 2016 06:39:31 -0700 (PDT) Received: by mail-yw0-x22a.google.com with SMTP id t67so48662968ywg.3; Thu, 29 Sep 2016 06:39:30 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc; bh=Hc+3rgDXlrJGb2Z9bfaZYDlGZwK+y9wI7ifvaJNbDzA=; b=LQ0lqCUFstuvwwbli/mGKzDFEVAJNahPJm0cpuC8l/iU1IedvY22Oooev4k1w86IE9 Et8ox+Ph5j/SeZJEheGQXO9hDTPp7Mu7DPNTOaf2omLVIyd0SB8/5gUauvryCF9wXYDM QbGckgHVuDfCIxZguylLa7ces0OZ36SYzxmDtEAa/veiWjRxapkkHt8H0O/AWslal81L org3SKujZGV39oH34d7ubYhLsEKDTl8QC6WRIHv+Y1JRLIgVvmsvhzUzrqAKdVz9vBte DArI3OLEitOWf5p8WTLorC3K7kU9X87vmVk3cfsB+40L/RX9CzaaIA8jgUJOW4oEMEgB TuPA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to:cc; bh=Hc+3rgDXlrJGb2Z9bfaZYDlGZwK+y9wI7ifvaJNbDzA=; b=C5HCifHKIFK8LdU+wp9N1j+pTxPYAWpcjVqaWwiHh7dh276IEApr9S5sk8S8oTPtaw ZGDfPa1sQrO/csr9V7EeVjywuyxVSOLlcMNN1akBbYvLHx/AAtLHDusfnetQfzijDNfP 1UdC00Tg28sER16A5dR3NPuzAypgZ1+eClhaJ20JckCmWr/XOQVaME653UXypEnhwNjt fLX0zf3DcCLolUkQ/2LcgwouUJnGRFLVqhLKJteCJhCwup7DT79c8oO3hCPAFgwYqNgl 51z6EA2J7X8rR9loAM7C6YABFnsT/iLotMiicWSC1uW6eTuPmduvA5fS4+qeuFBfSvgI mutQ== X-Gm-Message-State: AA6/9Rm1g4jJnXUXnW8u8YVDi+6rMfSOOKRynkS/kP9mFcW6ln5bnUmhOMYZ3pU4U/TGMg2cRuLUpZzLj1ddTg== X-Received: by 10.13.241.199 with SMTP id a190mr855888ywf.141.1475156370235; Thu, 29 Sep 2016 06:39:30 -0700 (PDT) MIME-Version: 1.0 Received: by 10.129.56.132 with HTTP; Thu, 29 Sep 2016 06:39:29 -0700 (PDT) In-Reply-To: References: <20160929014717.GB29612@faui40p.informatik.uni-erlangen.de> From: Alia Atlas Date: Thu, 29 Sep 2016 09:39:29 -0400 Message-ID: To: Tony Przygienda Content-Type: multipart/alternative; boundary=94eb2c0327206fa76a053da59b12 Archived-At: Cc: Toerless Eckert , "bier@ietf.org" , draft-ietf-bier-use-cases@ietf.org Subject: Re: [Bier] draft-ietf-bier-use-cases: BUM use-case questions considerations X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.17 Precedence: list List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 29 Sep 2016 13:39:35 -0000 --94eb2c0327206fa76a053da59b12 Content-Type: text/plain; charset=UTF-8 A point of VXLAN and other NVO3 encapsulations is that there is a virtual network (L2 in the case of BUM being interesting) that is being emulated. That means that the BUM traffic is sent to the other VMs in the same VNI - which should be significantly lower than all of the VMs in the data-center. Of course, many data-centers are L3 based and many may still not be virtualized. Regards, Alia On Wed, Sep 28, 2016 at 10:54 PM, Tony Przygienda wrote: > > > On Wed, Sep 28, 2016 at 6:47 PM, Toerless Eckert > wrote: > >> During the BIER interim, we discussed the VXLAM BUM use case for BIER. >> This would be similar to the EVPN use-case mentioned in the use-case >> draft. >> >> Q: Should VXLAN be added beside EVPN to the use case draft ? >> > > IMO yes ... > > >> >> Q: I haven't tried to read up on EVPN in detail: Is EVPN always >> "broadcasting" Unknown packets ? Isn't there a signaling option as well ? >> > > it does for BU_, for multicast a solution is currently worked on. Overlay > signaling for EVPN multicast with BIER has already been proposed. > > >> >> Ask: If would be great if the description of the use-case would consider >> example scale considerations, eg: Can we predict if, and how efficient >> BIER would be ? >> > > There are numbers I saw from providers but I'm not free to disclose them. > They looked pretty impressive @ 256 bit mask. > > >> >> That efficiency is somrthin i am mostly worried about: >> >> - Data centers may have as much as 10,000 TORs. Which i guess would be >> the BFER. 256 BitString length == 40 SIs. Aka: Worst case, if i have >> randomn allocation of 10,000 BFR-IDs, i would need to send up to >> 40 BIER packets for a BUM packet. >> > > 40 copies to serve 10K destinations is 99.6% compression rate. Your > complaint being? > > >> - Would VLANs have randomnly distributed VMs associated with them ? >> If not, eg: if they would stay usually within smaller PODs, that would >> be good to describe in the use-case text. >> - Would i achieve better replication efficiency if i would start >> to plan the bits more, eg: instead of SI use subdomains for PODs or >> the like... >> > > which we have the architecture for ... 255 subdomain should give you > pretty > good scaling if you exploit the locality on the topology. Inter-subdomain > forwarding > is a different issue outside BIER scope for the moment I'd say ... > > -- tony > > _______________________________________________ > BIER mailing list > BIER@ietf.org > https://www.ietf.org/mailman/listinfo/bier > > --94eb2c0327206fa76a053da59b12 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
A point of VXLAN and other NVO3 encapsulations is that the= re is a virtual network (L2 in the case of BUM being interesting) that is b= eing emulated.=C2=A0 That means that the BUM traffic is sent to the other V= Ms in the same VNI - which should be significantly lower than all of the VM= s in the data-center.

Of course, many data-centers are L= 3 based and many may still not be virtualized.

Reg= ards,
Alia

On Wed, Sep 28, 2016 at 10:54 PM, Tony Przygienda <tony= sietf@gmail.com> wrote:


On Wed, Sep 28, 2016 at 6:47 PM, Toerless Eckert <tte+i= etf@cs.fau.de> wrote:
Durin= g the BIER interim, we discussed the VXLAM BUM use case for BIER.
This would be similar to the EVPN use-case mentioned in the use-case draft.=

Q: Should VXLAN be added beside EVPN to the use case draft ?

IMO yes ...=C2=A0
= =C2=A0

Q: I haven't tried to read up on EVPN in detail: Is EVPN always
"broadcasting" Unknown packets ? Isn't there a signaling opti= on as well ?

it does for BU_, fo= r multicast a solution is currently worked on. Overlay signaling for EVPN m= ulticast with BIER has already been proposed.=C2=A0
<= div>=C2=A0

Ask: If would be great if the description of the use-case would consider example scale considerations, eg: Can we predict if, and how efficient
BIER would be ?

There are number= s I saw from providers but I'm not free to disclose them. They looked p= retty impressive @ 256 bit mask.=C2=A0
=C2=A0

That efficiency is somrthin i am mostly worried about:

- Data centers may have as much as 10,000 TORs. Which i guess would be
=C2=A0 the BFER. 256 BitString length =3D=3D 40 SIs. Aka: Worst case, if i = have
=C2=A0 randomn allocation of 10,000 BFR-IDs, i would need to send up to
=C2=A0 40 BIER packets for a BUM packet.

40 copies to serve 10K destinations is =C2=A099.6% compression rat= e. Your complaint being?
=C2=A0
- Would VLANs have randomnly distributed VMs associated with them ?
=C2=A0 If not, eg: if they would stay usually within smaller PODs, that wou= ld
=C2=A0 be good to describe in the use-case text.
- Would i achieve better replication efficiency if i would start
=C2=A0 to plan the bits more, eg: instead of SI use subdomains for PODs or<= br> =C2=A0 the like...

which we have= the architecture for ... =C2=A0255 subdomain should give you pretty
<= div>good scaling if you exploit the locality on the topology. Inter-subdoma= in forwarding=C2=A0
is a different issue outside BIER scope for t= he moment I'd say ...=C2=A0

-- tony=C2=A0

_______________________________________________
BIER mailing list
BIER@ietf.org
https://www.ietf.org/mailman/listinfo/bier


--94eb2c0327206fa76a053da59b12-- From nobody Thu Sep 29 06:54:18 2016 Return-Path: X-Original-To: bier@ietfa.amsl.com Delivered-To: bier@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 59F9312B105; Thu, 29 Sep 2016 06:54:16 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -16.836 X-Spam-Level: X-Spam-Status: No, score=-16.836 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_HI=-5, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, RP_MATCHES_RCVD=-2.316, SPF_PASS=-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 e-GWeL4hVL6N; Thu, 29 Sep 2016 06:54:12 -0700 (PDT) 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Tony Przygienda Thread-Topic: [Bier] draft-ietf-bier-use-cases: BUM use-case questions considerations Thread-Index: AQHSGlbvUtJmaybB3kSdkmdnzf46B6CQfSQA Date: Thu, 29 Sep 2016 13:53:57 +0000 Message-ID: References: <20160929014717.GB29612@faui40p.informatik.uni-erlangen.de> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-messagesentrepresentingtype: 1 x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.116.152.197] Content-Type: multipart/alternative; boundary="_000_D412942B810E0aceeciscocom_" MIME-Version: 1.0 Archived-At: Cc: Toerless Eckert , "bier@ietf.org" , "draft-ietf-bier-use-cases@ietf.org" Subject: Re: [Bier] draft-ietf-bier-use-cases: BUM use-case questions considerations X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.17 Precedence: list List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , 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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 k9SzflKAd9Mf; Thu, 29 Sep 2016 06:58:30 -0700 (PDT) Received: from mail-yw0-x234.google.com (mail-yw0-x234.google.com [IPv6:2607:f8b0:4002:c05::234]) (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 7EFD812B0D6; Thu, 29 Sep 2016 06:58:30 -0700 (PDT) Received: by mail-yw0-x234.google.com with SMTP id t67so49052828ywg.3; Thu, 29 Sep 2016 06:58:30 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc; bh=HbFbpAlWwBuneuSVg/v1LTAXIVxe2WSoP3HU6b8GxOU=; b=qqf9jN9l8ziWER4zUgMULgJm1ULpiyOilaBlqt65lnVxOKgQgsadFc+rE8THIFDadD 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10.129.50.201 with SMTP id y192mr934760ywy.136.1475157509644; Thu, 29 Sep 2016 06:58:29 -0700 (PDT) MIME-Version: 1.0 Received: by 10.129.56.132 with HTTP; Thu, 29 Sep 2016 06:58:29 -0700 (PDT) In-Reply-To: References: <20160929014717.GB29612@faui40p.informatik.uni-erlangen.de> From: Alia Atlas Date: Thu, 29 Sep 2016 09:58:29 -0400 Message-ID: To: "Acee Lindem (acee)" Content-Type: multipart/alternative; boundary=001a114092de59c52c053da5df6b Archived-At: Cc: Toerless Eckert , "draft-ietf-bier-use-cases@ietf.org" , "bier@ietf.org" Subject: Re: [Bier] draft-ietf-bier-use-cases: BUM use-case questions considerations X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.17 Precedence: list List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 29 Sep 2016 13:58:33 -0000 --001a114092de59c52c053da5df6b Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Hi Acee, On Thu, Sep 29, 2016 at 9:53 AM, Acee Lindem (acee) wrote: > Hi Alia, > > From: BIER on behalf of Alia Atlas < > akatlas@gmail.com> > Date: Thursday, September 29, 2016 at 9:39 AM > To: Tony Przygienda > Cc: Toerless Eckert , "bier@ietf.org" = , > "draft-ietf-bier-use-cases@ietf.org" > Subject: Re: [Bier] draft-ietf-bier-use-cases: BUM use-case questions > considerations > > A point of VXLAN and other NVO3 encapsulations is that there is a virtual > network (L2 in the case of BUM being interesting) that is being emulated. > That means that the BUM traffic is sent to the other VMs in the same VNI = - > which should be significantly lower than all of the VMs in the data-cente= r. > > > Isn=E2=80=99t the scaling for BUM traffic more a question of the number P= Es in the > underlay rather than the volume of traffic in any particular VNI or EVPN > Instance? > True - I was thinking of the number of receivers, but the underlay would need to be able to address each hypervisor or ToR. Depending on how the bits were assigned and applications were distributed onto physical machines, the benefits from BIER in the underlay might not be that good. Interested to hear others thoughts on the scaling and different places it is beneficial. Thanks for the correction! Alia Thanks, > Acee > > > > > Of course, many data-centers are L3 based and many may still not be > virtualized. > > Regards, > Alia > > On Wed, Sep 28, 2016 at 10:54 PM, Tony Przygienda > wrote: > >> >> >> On Wed, Sep 28, 2016 at 6:47 PM, Toerless Eckert >> wrote: >> >>> During the BIER interim, we discussed the VXLAM BUM use case for BIER. >>> This would be similar to the EVPN use-case mentioned in the use-case >>> draft. >>> >>> Q: Should VXLAN be added beside EVPN to the use case draft ? >>> >> >> IMO yes ... >> >> >>> >>> Q: I haven't tried to read up on EVPN in detail: Is EVPN always >>> "broadcasting" Unknown packets ? Isn't there a signaling option as well= ? >>> >> >> it does for BU_, for multicast a solution is currently worked on. Overla= y >> signaling for EVPN multicast with BIER has already been proposed. >> >> >>> >>> Ask: If would be great if the description of the use-case would conside= r >>> example scale considerations, eg: Can we predict if, and how efficient >>> BIER would be ? >>> >> >> There are numbers I saw from providers but I'm not free to disclose them= . >> They looked pretty impressive @ 256 bit mask. >> >> >>> >>> That efficiency is somrthin i am mostly worried about: >>> >>> - Data centers may have as much as 10,000 TORs. Which i guess would be >>> the BFER. 256 BitString length =3D=3D 40 SIs. Aka: Worst case, if i h= ave >>> randomn allocation of 10,000 BFR-IDs, i would need to send up to >>> 40 BIER packets for a BUM packet. >>> >> >> 40 copies to serve 10K destinations is 99.6% compression rate. Your >> complaint being? >> >> >>> - Would VLANs have randomnly distributed VMs associated with them ? >>> If not, eg: if they would stay usually within smaller PODs, that woul= d >>> be good to describe in the use-case text. >>> - Would i achieve better replication efficiency if i would start >>> to plan the bits more, eg: instead of SI use subdomains for PODs or >>> the like... >>> >> >> which we have the architecture for ... 255 subdomain should give you >> pretty >> good scaling if you exploit the locality on the topology. Inter-subdomai= n >> forwarding >> is a different issue outside BIER scope for the moment I'd say ... >> >> -- tony >> >> _______________________________________________ >> BIER mailing list >> BIER@ietf.org >> https://www.ietf.org/mailman/listinfo/bier >> >> > --001a114092de59c52c053da5df6b Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
Hi Acee,

On Thu, Sep 29, 2016 at 9:53 AM, Acee Lindem (acee) <acee@cisco.com> wrote:
Hi Alia,=C2=A0

From: BIER <bier-bounces@ietf.org> on beh= alf of Alia Atlas <akatlas@gmail.com>
Date: Thursday, September 29, 2016 = at 9:39 AM
To: Tony Przygienda <tonysietf@gmail.com> Cc: Toerless Eckert <tte+ietf@cs.fau.de>, &q= uot;bier@ietf.org&qu= ot; <bier@ietf.org>, "draft-ietf-bier-use-cases@ietf.org" <draft-ietf-bier-use-cases@ietf.org>
Subject: Re: [Bier] draft-ietf-bier= -use-cases: BUM use-case questions considerations

A point of VXLAN and other NVO3 encapsulations is that the= re is a virtual network (L2 in the case of BUM being interesting) that is b= eing emulated.=C2=A0 That means that the BUM traffic is sent to the other V= Ms in the same VNI - which should be significantly lower than all of the VMs in the data-center.

Isn=E2=80=99t the scaling for BUM traffic more a question of the numbe= r PEs in the underlay rather than the volume of traffic in any particular V= NI or EVPN Instance?=C2=A0

True= - I was thinking of the number of receivers, but the underlay would need t= o be able to address each hypervisor or ToR.=C2=A0 Depending on how the bit= s were assigned and applications were distributed onto physical machines, t= he benefits from BIER in the underlay might not be that good.
Interested to hear others thoughts on the scaling and different= places it is beneficial.

Thanks for the correctio= n!

Alia

Thanks,
Acee=C2=A0




Of course, many data-centers are L3 based and many may still not be vi= rtualized.

Regards,
Alia

On Wed, Sep 28, 2016 at 10:54 PM, Tony Przygiend= a <tonysietf@gmai= l.com> wrote:


On Wed, Sep 28, 2016 at 6:47 PM, Toerless = Eckert <tte+ietf@cs.fau.de> wrote:
During the BIER interim, we discussed the VXLAM BUM use case for BIER.
This would be similar to the EVPN use-case mentioned in the use-case draft.=

Q: Should VXLAN be added beside EVPN to the use case draft ?
IMO yes ...=C2=A0
=C2=A0

Q: I haven't tried to read up on EVPN in detail: Is EVPN always
"broadcasting" Unknown packets ? Isn't there a signaling opti= on as well ?
it does for BU_, for multicast a solution is currently worked on. Over= lay signaling for EVPN multicast with BIER has already been proposed.=C2=A0=
=C2=A0

Ask: If would be great if the description of the use-case would consider example scale considerations, eg: Can we predict if, and how efficient
BIER would be ?
There are numbers I saw from providers but I'm not free to disclos= e them. They looked pretty impressive @ 256 bit mask.=C2=A0
=C2=A0

That efficiency is somrthin i am mostly worried about:

- Data centers may have as much as 10,000 TORs. Which i guess would be
=C2=A0 the BFER. 256 BitString length =3D=3D 40 SIs. Aka: Worst case, if i = have
=C2=A0 randomn allocation of 10,000 BFR-IDs, i would need to send up to
=C2=A0 40 BIER packets for a BUM packet.
40 copies to serve 10K destinations is =C2=A099.6% compression rate. Y= our complaint being?
=C2=A0
- Would VLANs have randomnly distributed VMs associated with them ?
=C2=A0 If not, eg: if they would stay usually within smaller PODs, that wou= ld
=C2=A0 be good to describe in the use-case text.
- Would i achieve better replication efficiency if i would start
=C2=A0 to plan the bits more, eg: instead of SI use subdomains for PODs or<= br> =C2=A0 the like...
which we have the architecture for ... =C2=A0255 subdomain should give= you pretty
good scaling if you exploit the locality on the topology. Inter-subdom= ain forwarding=C2=A0
is a different issue outside BIER scope for the moment I'd say ...= =C2=A0

-- tony=C2=A0

_______________________________________________
BIER mailing list
BIER@ietf.org
https://www.ietf.org/mailman/listinfo/bier

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mO4hCSxU80yIb4XM2Rz2fmNULs4tm4g0+hPMqc0CLPENQmisxdkrIiJ+ZHMibQ6+Mc4t 0gDxkJe10VrF99ffI4j3bOuBu2dedaFeRiHn4sq8iOBxZfr2WC4y+hkkaQ04jx6KRlSU mk9pDlJyFx4S52ZoLiYpxBs8wtxYuhAqCopP8cPhm8RpFXaj0QZuzQy8nb4QgN0J3UFx 5Cfjes0HyIezqMK9y5lIKwnU2rVTDN9qlVFrvtovfHmdasthjUVbos7Dedm2Dr/AR8i6 GT9w== X-Gm-Message-State: AA6/9RmixMblE+3FIuzXB1mkKc9/n/tNsCh1eOS89frYzARBidZd0HF9fCOsk37WZ+ZZkZfQQYZQ2YjurP9Muw== X-Received: by 10.55.77.7 with SMTP id a7mr2570378qkb.35.1475169127381; Thu, 29 Sep 2016 10:12:07 -0700 (PDT) MIME-Version: 1.0 Received: by 10.200.52.17 with HTTP; Thu, 29 Sep 2016 10:12:06 -0700 (PDT) From: Greg Shepherd Date: Thu, 29 Sep 2016 10:12:06 -0700 Message-ID: To: "bier@ietf.org" Content-Type: multipart/alternative; boundary=001a114a7df4d2492c053da893a9 Archived-At: Subject: [Bier] WebEx recording is available for viewing: BIER WG Interim-20160927 1728-1 X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.17 Precedence: list Reply-To: gjshep@gmail.com List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 29 Sep 2016 17:12:16 -0000 --001a114a7df4d2492c053da893a9 Content-Type: text/plain; charset=UTF-8 *From: *Gregory Shepherd *Subject: **WebEx recording is available for viewing: BIER WG Interim-20160927 1728-1* *Date: *September 28, 2016 at 8:21:01 AM PDT *To: * *Reply-To: * Hi, Gregory Shepherd, Gregory Shepherd wants to share this WebEx recording with you. *BIER WG Interim-20160927 1728-1* Tuesday, September 27, 2016 6:08 pm | Pacific Daylight Time (San Francisco, GMT-07:00) *Play recording* (5 hr) Recording password: 6hAv5F2U --001a114a7df4d2492c053da893a9 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable

From: Gregory Shepherd <messenger@webex.com>
Subject: WebEx recording is available for viewing: BIER WG In= terim-20160927 1728-1
Date: September 28, 2016 at 8:21:01 AM PDT
Reply-To: <shep@cisco.com>

Hi, Gregory Shepherd,
Gregory Shepherd wants to share this WebEx recording with you.
=C2=A0
BIER WG Interim-20160927 1728-1
Tuesday, September 27, 2016
6:08 pm=C2=A0=C2=A0|=C2=A0=C2=A0Pacific Daylight Time (San Francisco, GMT-0= 7:00)
=C2=A0
Play recordi= ng=C2=A0(5 hr)
Recording password: 6hAv5F2U


--001a114a7df4d2492c053da893a9-- From nobody Thu Sep 29 10:38:26 2016 Return-Path: X-Original-To: bier@ietfa.amsl.com Delivered-To: bier@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 3868512B025; Thu, 29 Sep 2016 10:38:25 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -4.215 X-Spam-Level: X-Spam-Status: No, score=-4.215 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.001, RP_MATCHES_RCVD=-2.316] 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 lOi3qYVID6-H; Thu, 29 Sep 2016 10:38:23 -0700 (PDT) Received: from faui40.informatik.uni-erlangen.de (faui40.informatik.uni-erlangen.de [IPv6:2001:638:a000:4134::ffff:40]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id D259412B0AF; Thu, 29 Sep 2016 10:38:22 -0700 (PDT) Received: from faui40p.informatik.uni-erlangen.de (faui40p.informatik.uni-erlangen.de [IPv6:2001:638:a000:4134::ffff:77]) by faui40.informatik.uni-erlangen.de (Postfix) with ESMTP id 5180058C4B5; Thu, 29 Sep 2016 19:38:21 +0200 (CEST) Received: by faui40p.informatik.uni-erlangen.de (Postfix, from userid 10463) id 381E5B0A9AE; Thu, 29 Sep 2016 19:38:21 +0200 (CEST) Date: Thu, 29 Sep 2016 19:38:21 +0200 From: Toerless Eckert To: Tony Przygienda Message-ID: <20160929173820.GC29612@faui40p.informatik.uni-erlangen.de> References: <20160929014717.GB29612@faui40p.informatik.uni-erlangen.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.21 (2010-09-15) Archived-At: Cc: Toerless Eckert , "bier@ietf.org" , draft-ietf-bier-use-cases@ietf.org Subject: Re: [Bier] draft-ietf-bier-use-cases: BUM use-case questions considerations X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.17 Precedence: list List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 29 Sep 2016 17:38:25 -0000 On Wed, Sep 28, 2016 at 07:54:37PM -0700, Tony Przygienda wrote: > > That efficiency is something i am mostly worried about: > > > > - Data centers may have as much as 10,000 TORs. Which i guess would be > > the BFER. 256 BitString length == 40 SIs. Aka: Worst case, if i have > > randomn allocation of 10,000 BFR-IDs, i would need to send up to > > 40 BIER packets for a BUM packet. > > 40 copies to serve 10K destinations is 99.6% compression rate. Your > complaint being? 1) Addressing randomn small subsets of large number of BFER (due to SI/subdomains) Large DC with 10,000 TORs, some VLAN (EVPN/VXLAN/whatever) with just 50 VMs. VMs spread aross 50 TORs. Each TOR is BFER translating from VLANs L2/L3 multicast to BIER. Worst case, these 50 TORs have bits in 40 different SI/Subdomains (10,000 TORs / 256 BSL = 40). Sending TOR has to send 40 BIER packets instead of 50 unicast packets without BIER/multicast. 2) Large number of VMs behind small number of TORs Even if a VLAN has a large #VMs, but those are all behind few TORs, the savings via BIER or multicast is just that #TORs - a unicast solution would also only send #TOR copies of packets. I have no DC stats. If i have VLANs with large #VMs behind large #TORs and these an be 'regionalized' by eg: PODs, then BIER would do excellent. If either of the two above scenarios are most common, it would not. So it would be great to identify and write down known best cases in the use cases doc. Even if those are just examples. But examples known to exist would IMHO be very helpfull. Of course, any "M" example could likely result in orders of magnitude more traffic than "BU" traffic,and even a factor of 2..10 replication efficiency could justify BIER. And then it may not be relevant anymore that the total amount of "BU" traffic efficiency optimization may on average not be high enough to justify BIER by itself. Cheers Toerless > > - Would VLANs have randomnly distributed VMs associated with them ? > > If not, eg: if they would stay usually within smaller PODs, that would > > be good to describe in the use-case text. > > - Would i achieve better replication efficiency if i would start > > to plan the bits more, eg: instead of SI use subdomains for PODs or > > the like... > > which we have the architecture for ... 255 subdomain should give you pretty > good scaling if you exploit the locality on the topology. Inter-subdomain > forwarding > is a different issue outside BIER scope for the moment I'd say ... > > -- tony From nobody Thu Sep 29 11:03:41 2016 Return-Path: X-Original-To: bier@ietfa.amsl.com Delivered-To: bier@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id C2A3512B217; Thu, 29 Sep 2016 11:03:39 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.903 X-Spam-Level: X-Spam-Status: No, score=-1.903 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=junipernetworks.onmicrosoft.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 MaVVR1VDGyAf; Thu, 29 Sep 2016 11:03:37 -0700 (PDT) Received: from NAM03-CO1-obe.outbound.protection.outlook.com (mail-co1nam03on0109.outbound.protection.outlook.com [104.47.40.109]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id E38A612B1FC; 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SRVR:DM5PR05MB3147; H:DM5PR05MB3145.namprd05.prod.outlook.com; FPR:; SPF:None; PTR:InfoNoRecords; MX:1; A:1; LANG:en; received-spf: None (protection.outlook.com: juniper.net does not designate permitted sender hosts) spamdiagnosticoutput: 1:99 spamdiagnosticmetadata: NSPM Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: juniper.net X-MS-Exchange-CrossTenant-originalarrivaltime: 29 Sep 2016 18:03:25.2775 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: bea78b3c-4cdb-4130-854a-1d193232e5f4 X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM5PR05MB3147 Archived-At: Cc: "bier@ietf.org" , Toerless Eckert , "draft-ietf-bier-use-cases@ietf.org" Subject: Re: [Bier] draft-ietf-bier-use-cases: BUM use-case questions considerations X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.17 Precedence: list List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 29 Sep 2016 18:03:40 -0000 Hi Toerless, No there is no such assumption. W/o segmentation, you may have to send 40 copies to reach just 40 VMs that = are scattered sparsely. W/ segmentation, you may need just one or a few copy to cover all those in = the same ingress pod, and all those in different pods but are reachable via= the border routers (segmentation points) in the same ingress pod. Jeffrey > -----Original Message----- > From: Toerless Eckert [mailto:tte@cs.fau.de] > Sent: Thursday, September 29, 2016 1:52 PM > To: Jeffrey (Zhaohui) Zhang > Cc: Alia Atlas ; Tony Przygienda = ; > Toerless Eckert ; bier@ietf.org; draft-ietf-bier-use- > cases@ietf.org > Subject: Re: [Bier] draft-ietf-bier-use-cases: BUM use-case questions > considerations >=20 > Thanks, Jeff >=20 > Are you implying that the mayority of EVPN/VXLAN VLANs would have VMs > primarily only within a single POD ? Would be nice if the use-case draft > could give some reasonable likely example. >=20 > Not sure if the following are realistic DC data, but if they wher, > then this type of explanation could help to justify BIER for the readers > that are like me now cued in that much about DC stats: >=20 > - VMs in VLANs are most commonly spread inside a POD > - PODs likely have 100...1000 TORs > - VLANs can likely spread some 20..80% of TORs. >=20 > With numbers like these and BSL 256, BIER would give great replication > efficiency - factor 50..200. Worst case 2..4 packets sent. Will never > send a packet unnecessary to a TOR - with IP multicast one very likely > would end up iwth setups where traffic would unnecessarily be sent to > TORs. >=20 > etc. pp. Aka: try to figure out the best up-pitch we can describe. >=20 > Cheers > Toerless >=20 > On Thu, Sep 29, 2016 at 03:07:56PM +0000, Jeffrey (Zhaohui) Zhang wrote: > > > which we have the architecture for ... 255 subdomain should give you > pretty > > good scaling if you exploit the locality on the topology. Inter- > subdomain forwarding > > is a different issue outside BIER scope for the moment I'd say ... > > > > Provider tunnel segmentation already specified for MVPN and has been > proposed for EVPN (https://tools.ietf.org/html/draft-zzhang-bess-evpn-bum= - > procedure-updates-03#section-6). > > > > Here each segmentation region would be a BIER sub-domain, corresponding > to a pod. > > > > Jeffrey > > > > > > From: BIER [mailto:bier-bounces@ietf.org] On Behalf Of Alia Atlas > > Sent: Thursday, September 29, 2016 9:39 AM > > To: Tony Przygienda > > Cc: Toerless Eckert ; bier@ietf.org; draft-ietf- > bier-use-cases@ietf.org > > Subject: Re: [Bier] draft-ietf-bier-use-cases: BUM use-case questions > considerations > > > > A point of VXLAN and other NVO3 encapsulations is that there is a > virtual network (L2 in the case of BUM being interesting) that is being > emulated. That means that the BUM traffic is sent to the other VMs in th= e > same VNI - which should be significantly lower than all of the VMs in the > data-center. > > > > Of course, many data-centers are L3 based and many may still not be > virtualized. > > > > Regards, > > Alia > > > > On Wed, Sep 28, 2016 at 10:54 PM, Tony Przygienda > > wrote: > > > > > > On Wed, Sep 28, 2016 at 6:47 PM, Toerless Eckert > > wrote: > > During the BIER interim, we discussed the VXLAM BUM use case for BIER. > > This would be similar to the EVPN use-case mentioned in the use-case > draft. > > > > Q: Should VXLAN be added beside EVPN to the use case draft ? > > > > IMO yes ... > > > > > > Q: I haven't tried to read up on EVPN in detail: Is EVPN always > > "broadcasting" Unknown packets ? Isn't there a signaling option as well= ? > > > > it does for BU_, for multicast a solution is currently worked on. > Overlay signaling for EVPN multicast with BIER has already been proposed. > > > > > > Ask: If would be great if the description of the use-case would conside= r > > example scale considerations, eg: Can we predict if, and how efficient > > BIER would be ? > > > > There are numbers I saw from providers but I'm not free to disclose the= m. > They looked pretty impressive @ 256 bit mask. > > > > > > That efficiency is somrthin i am mostly worried about: > > > > - Data centers may have as much as 10,000 TORs. Which i guess would be > > the BFER. 256 BitString length =3D=3D 40 SIs. Aka: Worst case, if i h= ave > > randomn allocation of 10,000 BFR-IDs, i would need to send up to > > 40 BIER packets for a BUM packet. > > > > 40 copies to serve 10K destinations is 99.6% compression rate. Your > complaint being? > > > > - Would VLANs have randomnly distributed VMs associated with them ? > > If not, eg: if they would stay usually within smaller PODs, that woul= d > > be good to describe in the use-case text. > > - Would i achieve better replication efficiency if i would start > > to plan the bits more, eg: instead of SI use subdomains for PODs or > > the like... > > > > which we have the architecture for ... 255 subdomain should give you > pretty > > good scaling if you exploit the locality on the topology. Inter- > subdomain forwarding > > is a different issue outside BIER scope for the moment I'd say ... > > > > -- tony > > > > _______________________________________________ > > BIER mailing list > > BIER@ietf.org > > https://www.ietf.org/mailman/listinfo/bier > > >=20 > > _______________________________________________ > > BIER mailing list > > BIER@ietf.org > > https://www.ietf.org/mailman/listinfo/bier >=20 >=20 > -- > --- > tte@cs.fau.de From nobody Thu Sep 29 11:57:44 2016 Return-Path: X-Original-To: bier@ietfa.amsl.com Delivered-To: bier@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 92D2512B192; Thu, 29 Sep 2016 11:57:41 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.903 X-Spam-Level: X-Spam-Status: No, score=-1.903 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); 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DIR:OUT; SFP:1102; SCL:1; SRVR:DM5PR05MB3145; H:DM5PR05MB3145.namprd05.prod.outlook.com; FPR:; SPF:None; PTR:InfoNoRecords; A:1; MX:1; LANG:en; received-spf: None (protection.outlook.com: juniper.net does not designate permitted sender hosts) spamdiagnosticoutput: 1:99 spamdiagnosticmetadata: NSPM Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: juniper.net X-MS-Exchange-CrossTenant-originalarrivaltime: 29 Sep 2016 18:57:36.9514 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: bea78b3c-4cdb-4130-854a-1d193232e5f4 X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM5PR05MB3145 Archived-At: Cc: "bier@ietf.org" , Toerless Eckert , "draft-ietf-bier-use-cases@ietf.org" Subject: Re: [Bier] draft-ietf-bier-use-cases: BUM use-case questions considerations X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.17 Precedence: list List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 29 Sep 2016 18:57:41 -0000 > BIER only inside > PODs, Segmentation points become BUM level forwarders, receiving them as > BFER, and replicating them out to all other necessary PODs BIER domains. Yes that's the idea of segmentation. Jeffrey > -----Original Message----- > From: Toerless Eckert [mailto:tte@cs.fau.de] > Sent: Thursday, September 29, 2016 2:54 PM > To: Jeffrey (Zhaohui) Zhang > Cc: Alia Atlas ; Tony Przygienda = ; > Toerless Eckert ; bier@ietf.org; draft-ietf-bier-use- > cases@ietf.org > Subject: Re: [Bier] draft-ietf-bier-use-cases: BUM use-case questions > considerations >=20 > Ok, would this be a typial example then: > - Small-DC: my prior single POD example. 1..4 copies worst. > - Normal/large DC: Many pods with segmentation points between them. > #packets ~=3D 1..4 * #PODs covering the VLAN. >=20 > If the segmentation points would actively participate in the BUM solution= , > then IMHO we could get rid of those additional copies. Eg: Eg; BIER only > inside > PODs, Segmentation points become BUM level forwarders, receiving them as > BFER, and replicating them out to all other necessary PODs BIER domains. >=20 > On Thu, Sep 29, 2016 at 06:03:25PM +0000, Jeffrey (Zhaohui) Zhang wrote: > > Hi Toerless, > > > > No there is no such assumption. > > > > W/o segmentation, you may have to send 40 copies to reach just 40 VMs > that are scattered sparsely. > > > > W/ segmentation, you may need just one or a few copy to cover all those > in the same ingress pod, and all those in different pods but are reachabl= e > via the border routers (segmentation points) in the same ingress pod. > > > > Jeffrey > > > > > -----Original Message----- > > > From: Toerless Eckert [mailto:tte@cs.fau.de] > > > Sent: Thursday, September 29, 2016 1:52 PM > > > To: Jeffrey (Zhaohui) Zhang > > > Cc: Alia Atlas ; Tony Przygienda > ; > > > Toerless Eckert ; bier@ietf.org; draft-ietf-bier- > use- > > > cases@ietf.org > > > Subject: Re: [Bier] draft-ietf-bier-use-cases: BUM use-case questions > > > considerations > > > > > > Thanks, Jeff > > > > > > Are you implying that the mayority of EVPN/VXLAN VLANs would have VMs > > > primarily only within a single POD ? Would be nice if the use-case > draft > > > could give some reasonable likely example. > > > > > > Not sure if the following are realistic DC data, but if they wher, > > > then this type of explanation could help to justify BIER for the > readers > > > that are like me now cued in that much about DC stats: > > > > > > - VMs in VLANs are most commonly spread inside a POD > > > - PODs likely have 100...1000 TORs > > > - VLANs can likely spread some 20..80% of TORs. > > > > > > With numbers like these and BSL 256, BIER would give great replicatio= n > > > efficiency - factor 50..200. Worst case 2..4 packets sent. Will never > > > send a packet unnecessary to a TOR - with IP multicast one very likel= y > > > would end up iwth setups where traffic would unnecessarily be sent to > > > TORs. > > > > > > etc. pp. Aka: try to figure out the best up-pitch we can describe. > > > > > > Cheers > > > Toerless > > > > > > On Thu, Sep 29, 2016 at 03:07:56PM +0000, Jeffrey (Zhaohui) Zhang > wrote: > > > > > which we have the architecture for ... 255 subdomain should give > you > > > pretty > > > > good scaling if you exploit the locality on the topology. Inter- > > > subdomain forwarding > > > > is a different issue outside BIER scope for the moment I'd say ... > > > > > > > > Provider tunnel segmentation already specified for MVPN and has bee= n > > > proposed for EVPN (https://tools.ietf.org/html/draft-zzhang-bess-evpn= - > bum- > > > procedure-updates-03#section-6). > > > > > > > > Here each segmentation region would be a BIER sub-domain, > corresponding > > > to a pod. > > > > > > > > Jeffrey > > > > > > > > > > > > From: BIER [mailto:bier-bounces@ietf.org] On Behalf Of Alia Atlas > > > > Sent: Thursday, September 29, 2016 9:39 AM > > > > To: Tony Przygienda > > > > Cc: Toerless Eckert ; bier@ietf.org; draft-ietf= - > > > bier-use-cases@ietf.org > > > > Subject: Re: [Bier] draft-ietf-bier-use-cases: BUM use-case > questions > > > considerations > > > > > > > > A point of VXLAN and other NVO3 encapsulations is that there is a > > > virtual network (L2 in the case of BUM being interesting) that is > being > > > emulated. That means that the BUM traffic is sent to the other VMs i= n > the > > > same VNI - which should be significantly lower than all of the VMs in > the > > > data-center. > > > > > > > > Of course, many data-centers are L3 based and many may still not be > > > virtualized. > > > > > > > > Regards, > > > > Alia > > > > > > > > On Wed, Sep 28, 2016 at 10:54 PM, Tony Przygienda > > > > wrote: > > > > > > > > > > > > On Wed, Sep 28, 2016 at 6:47 PM, Toerless Eckert > > > > wrote: > > > > During the BIER interim, we discussed the VXLAM BUM use case for > BIER. > > > > This would be similar to the EVPN use-case mentioned in the use-cas= e > > > draft. > > > > > > > > Q: Should VXLAN be added beside EVPN to the use case draft ? > > > > > > > > IMO yes ... > > > > > > > > > > > > Q: I haven't tried to read up on EVPN in detail: Is EVPN always > > > > "broadcasting" Unknown packets ? Isn't there a signaling option as > well ? > > > > > > > > it does for BU_, for multicast a solution is currently worked on. > > > Overlay signaling for EVPN multicast with BIER has already been > proposed. > > > > > > > > > > > > Ask: If would be great if the description of the use-case would > consider > > > > example scale considerations, eg: Can we predict if, and how > efficient > > > > BIER would be ? > > > > > > > > There are numbers I saw from providers but I'm not free to disclose > them. > > > They looked pretty impressive @ 256 bit mask. > > > > > > > > > > > > That efficiency is somrthin i am mostly worried about: > > > > > > > > - Data centers may have as much as 10,000 TORs. Which i guess would > be > > > > the BFER. 256 BitString length =3D=3D 40 SIs. Aka: Worst case, if= i > have > > > > randomn allocation of 10,000 BFR-IDs, i would need to send up to > > > > 40 BIER packets for a BUM packet. > > > > > > > > 40 copies to serve 10K destinations is 99.6% compression rate. You= r > > > complaint being? > > > > > > > > - Would VLANs have randomnly distributed VMs associated with them ? > > > > If not, eg: if they would stay usually within smaller PODs, that > would > > > > be good to describe in the use-case text. > > > > - Would i achieve better replication efficiency if i would start > > > > to plan the bits more, eg: instead of SI use subdomains for PODs > or > > > > the like... > > > > > > > > which we have the architecture for ... 255 subdomain should give > you > > > pretty > > > > good scaling if you exploit the locality on the topology. Inter- > > > subdomain forwarding > > > > is a different issue outside BIER scope for the moment I'd say ... > > > > > > > > -- tony > > > > > > > > _______________________________________________ > > > > BIER mailing list > > > > BIER@ietf.org > > > > https://www.ietf.org/mailman/listinfo/bier > > > > > > > > > > > _______________________________________________ > > > > BIER mailing list > > > > BIER@ietf.org > > > > https://www.ietf.org/mailman/listinfo/bier > > > > > > > > > -- > > > --- > > > tte@cs.fau.de >=20 > -- > --- > tte@cs.fau.de From nobody Thu Sep 29 12:04:04 2016 Return-Path: X-Original-To: bier@ietfa.amsl.com Delivered-To: bier@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id DAE4D12B181; Thu, 29 Sep 2016 12:04:02 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -5.029 X-Spam-Level: X-Spam-Status: No, score=-5.029 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, FAKE_REPLY_C=1.486, HEADER_FROM_DIFFERENT_DOMAINS=0.001, RCVD_IN_DNSWL_MED=-2.3, RP_MATCHES_RCVD=-2.316] 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 fwDqt3Ua-XKM; Thu, 29 Sep 2016 12:04:00 -0700 (PDT) Received: from faui40.informatik.uni-erlangen.de (faui40.informatik.uni-erlangen.de [131.188.34.40]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id B8AC512B16E; Thu, 29 Sep 2016 12:04:00 -0700 (PDT) Received: from faui40p.informatik.uni-erlangen.de (faui40p.informatik.uni-erlangen.de [131.188.34.77]) by faui40.informatik.uni-erlangen.de (Postfix) with ESMTP id 36F1358C4B5; Thu, 29 Sep 2016 21:03:59 +0200 (CEST) Received: by faui40p.informatik.uni-erlangen.de (Postfix, from userid 10463) id 25CBFB0A9B0; Thu, 29 Sep 2016 21:03:59 +0200 (CEST) Date: Thu, 29 Sep 2016 21:03:59 +0200 From: Toerless Eckert To: "Jeffrey (Zhaohui) Zhang" Message-ID: <20160929190359.GA24444@faui40p.informatik.uni-erlangen.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.5.21 (2010-09-15) Archived-At: Cc: "bier@ietf.org" , Toerless Eckert , "draft-ietf-bier-use-cases@ietf.org" Subject: Re: [Bier] bier-ietf-bier-use-cases: BUM use-case questions considerations X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.17 Precedence: list List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 29 Sep 2016 19:04:03 -0000 Ok, would this be a typial example then: - Small-DC: my prior single POD example. 1..4 copies worst. - Normal/large DC: Many pods with segmentation points between them. #packets ~= 1..4 * #PODs covering the VLAN. If the segmentation points would actively participate in the BUM solution, then IMHO we could get rid of those additional copies. Eg: Eg; BIER only inside PODs, Segmentation points become BUM level forwarders, receiving them as BFER, and replicating them out to all other necessary PODs BIER domains. On Thu, Sep 29, 2016 at 06:03:25PM +0000, Jeffrey (Zhaohui) Zhang wrote: > Hi Toerless, > > No there is no such assumption. > > W/o segmentation, you may have to send 40 copies to reach just 40 VMs that are scattered sparsely. > > W/ segmentation, you may need just one or a few copy to cover all those in the same ingress pod, and all those in different pods but are reachable via the border routers (segmentation points) in the same ingress pod. > > Jeffrey > > > -----Original Message----- > > From: Toerless Eckert [mailto:tte@cs.fau.de] > > Sent: Thursday, September 29, 2016 1:52 PM > > To: Jeffrey (Zhaohui) Zhang > > Cc: Alia Atlas ; Tony Przygienda ; > > Toerless Eckert ; bier@ietf.org; draft-ietf-bier-use- > > cases@ietf.org > > Subject: Re: [Bier] draft-ietf-bier-use-cases: BUM use-case questions > > considerations > > > > Thanks, Jeff > > > > Are you implying that the mayority of EVPN/VXLAN VLANs would have VMs > > primarily only within a single POD ? Would be nice if the use-case draft > > could give some reasonable likely example. > > > > Not sure if the following are realistic DC data, but if they wher, > > then this type of explanation could help to justify BIER for the readers > > that are like me now cued in that much about DC stats: > > > > - VMs in VLANs are most commonly spread inside a POD > > - PODs likely have 100...1000 TORs > > - VLANs can likely spread some 20..80% of TORs. > > > > With numbers like these and BSL 256, BIER would give great replication > > efficiency - factor 50..200. Worst case 2..4 packets sent. Will never > > send a packet unnecessary to a TOR - with IP multicast one very likely > > would end up iwth setups where traffic would unnecessarily be sent to > > TORs. > > > > etc. pp. Aka: try to figure out the best up-pitch we can describe. > > > > Cheers > > Toerless > > > > On Thu, Sep 29, 2016 at 03:07:56PM +0000, Jeffrey (Zhaohui) Zhang wrote: > > > > which we have the architecture for ... 255 subdomain should give you > > pretty > > > good scaling if you exploit the locality on the topology. Inter- > > subdomain forwarding > > > is a different issue outside BIER scope for the moment I'd say ... > > > > > > Provider tunnel segmentation already specified for MVPN and has been > > proposed for EVPN (https://tools.ietf.org/html/draft-zzhang-bess-evpn-bum- > > procedure-updates-03#section-6). > > > > > > Here each segmentation region would be a BIER sub-domain, corresponding > > to a pod. > > > > > > Jeffrey > > > > > > > > > From: BIER [mailto:bier-bounces@ietf.org] On Behalf Of Alia Atlas > > > Sent: Thursday, September 29, 2016 9:39 AM > > > To: Tony Przygienda > > > Cc: Toerless Eckert ; bier@ietf.org; draft-ietf- > > bier-use-cases@ietf.org > > > Subject: Re: [Bier] draft-ietf-bier-use-cases: BUM use-case questions > > considerations > > > > > > A point of VXLAN and other NVO3 encapsulations is that there is a > > virtual network (L2 in the case of BUM being interesting) that is being > > emulated. That means that the BUM traffic is sent to the other VMs in the > > same VNI - which should be significantly lower than all of the VMs in the > > data-center. > > > > > > Of course, many data-centers are L3 based and many may still not be > > virtualized. > > > > > > Regards, > > > Alia > > > > > > On Wed, Sep 28, 2016 at 10:54 PM, Tony Przygienda > > > wrote: > > > > > > > > > On Wed, Sep 28, 2016 at 6:47 PM, Toerless Eckert > > > wrote: > > > During the BIER interim, we discussed the VXLAM BUM use case for BIER. > > > This would be similar to the EVPN use-case mentioned in the use-case > > draft. > > > > > > Q: Should VXLAN be added beside EVPN to the use case draft ? > > > > > > IMO yes ... > > > > > > > > > Q: I haven't tried to read up on EVPN in detail: Is EVPN always > > > "broadcasting" Unknown packets ? Isn't there a signaling option as well ? > > > > > > it does for BU_, for multicast a solution is currently worked on. > > Overlay signaling for EVPN multicast with BIER has already been proposed. > > > > > > > > > Ask: If would be great if the description of the use-case would consider > > > example scale considerations, eg: Can we predict if, and how efficient > > > BIER would be ? > > > > > > There are numbers I saw from providers but I'm not free to disclose them. > > They looked pretty impressive @ 256 bit mask. > > > > > > > > > That efficiency is somrthin i am mostly worried about: > > > > > > - Data centers may have as much as 10,000 TORs. Which i guess would be > > > the BFER. 256 BitString length == 40 SIs. Aka: Worst case, if i have > > > randomn allocation of 10,000 BFR-IDs, i would need to send up to > > > 40 BIER packets for a BUM packet. > > > > > > 40 copies to serve 10K destinations is 99.6% compression rate. Your > > complaint being? > > > > > > - Would VLANs have randomnly distributed VMs associated with them ? > > > If not, eg: if they would stay usually within smaller PODs, that would > > > be good to describe in the use-case text. > > > - Would i achieve better replication efficiency if i would start > > > to plan the bits more, eg: instead of SI use subdomains for PODs or > > > the like... > > > > > > which we have the architecture for ... 255 subdomain should give you > > pretty > > > good scaling if you exploit the locality on the topology. Inter- > > subdomain forwarding > > > is a different issue outside BIER scope for the moment I'd say ... > > > > > > -- tony From nobody Fri Sep 30 10:53:03 2016 Return-Path: X-Original-To: bier@ietfa.amsl.com Delivered-To: bier@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 3DBF512B1A5 for ; Fri, 30 Sep 2016 10:53:02 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.699 X-Spam-Level: X-Spam-Status: No, score=-2.699 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-0.7, SPF_PASS=-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 BZBwEpf8qeeE for ; Fri, 30 Sep 2016 10:53:00 -0700 (PDT) Received: from mail-qk0-x230.google.com (mail-qk0-x230.google.com [IPv6:2607:f8b0:400d:c09::230]) (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 BD53012B150 for ; Fri, 30 Sep 2016 10:52:59 -0700 (PDT) Received: by mail-qk0-x230.google.com with SMTP id z190so113798536qkc.3 for ; Fri, 30 Sep 2016 10:52:59 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:reply-to:from:date:message-id:subject:to; bh=Z495P1KklIb4fNaxdB4teDs7lY80lxeNGwsyOKxQsRo=; b=ovGark5zcLr7CExiR64kpITxbVXRrnvWs1xN0urtyN0sPL5OFggrJ6gFG26kc8TvN/ 6bybVYhJpQi/nNWnW9ez0WVIrry7RTqaxZpPw8Qc29V6ik5ZjP4zXpazt11YBo0s9Vhw LQi1l6HQvU4HHYRSY7jkcQ4NMv0CkMe+Sj18Eb5OqrOOW/SL9OdzIQPrGINzGyUf0yjl H3hX2VktzXvkA4GN57K3v418WfORUjqcPjeXq3zuIwU19P+liZfb7xnBQk6pxCfK7ac6 mvWRhndd0H0WRG/TbvX0HYvoXE8W1rXN4IfR9r5Er6x9SBBQ3Wo8ljRvCZPHsJWq9tGW 8/Dw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:reply-to:from:date:message-id :subject:to; bh=Z495P1KklIb4fNaxdB4teDs7lY80lxeNGwsyOKxQsRo=; b=OmpE1ZTiU3de4IcEY533HT6euo9UDGQ9NbPmFxvn1vw3Wahs1QGbK0nAGWZdIe2PaJ dazQF7n0KavguWXTrGbq/F9hWvrZdPfBuU6TVNIWCkbhIzD6Q7ANWkeTEuctHGzT/OPG 7iGS9XQnhW1YGCt4Gcs7fYuvP3d8KB5uFfkDfQa3oZX7e+VGtXw80xYCxjzhdrWEfhN3 VVMepX3vAvhZMxx+WT6TC4y4vzYaIc5lm5fVXT8+3Vg5kTfFJeFpntUQUcaJ+/xiPaUr I7tpmCZcD/R5tL+aN3duwDPowv9R5ptr3e1DFY48o4NaXACM/1ZjZw5/lTAyexsBxKuw HRBA== X-Gm-Message-State: AA6/9RlzVqhe+CfQgzqDdGwg2IetWBEJzL/jqsjB18lN4FwN0qGpApzfxzIQAYqxGw+50bDJzCEztUamGGgovw== X-Received: by 10.55.47.135 with SMTP id v129mr7891693qkh.127.1475257978787; Fri, 30 Sep 2016 10:52:58 -0700 (PDT) MIME-Version: 1.0 Received: by 10.200.49.90 with HTTP; Fri, 30 Sep 2016 10:52:58 -0700 (PDT) From: Greg Shepherd Date: Fri, 30 Sep 2016 10:52:58 -0700 Message-ID: To: "bier@ietf.org" Content-Type: multipart/alternative; boundary=001a114f4020c71dbf053dbd4339 Archived-At: Subject: [Bier] Interim Day 2: WebEx recording is available for viewing: BIER WG Interim-20160928 2118-1 X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.17 Precedence: list Reply-To: gjshep@gmail.com List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 30 Sep 2016 17:53:02 -0000 --001a114f4020c71dbf053dbd4339 Content-Type: text/plain; charset=UTF-8 *From: * *Subject: **Your WebEx recording is available for viewing: BIER WG Interim-20160928 2118-1* *Date: *September 28, 2016 at 3:34:57 PM PDT *To: * *Reply-To: * Hi, Gregory Shepherd, Your recording is now available on your WebEx site. *BIER WG Interim-20160928 2118-1* Wednesday, September 28, 2016 2:18 pm | Pacific Daylight Time (San Francisco, GMT-07:00) *Play recording* (1 hr 8 min 20 sec) Recording password: rVh6v6cm You can forward this message to others to allow them to play back the recording. *Additional options* Edit recording Download recording Manage recordings View FAQ --001a114f4020c71dbf053dbd4339 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable


Subject: Your WebEx recording is available for viewing: BIER = WG Interim-20160928 2118-1
Date: September 28, 2016 at 3:34:57 PM PDT
Reply-To: <messenger@webex.com>

Hi, Gregory Shepherd,
Your recording is now available on your WebEx site.
=C2=A0
BIER WG Interim-20160928 2118-1
Wednesday, September 28, 2016
2:18 pm=C2=A0=C2=A0|=C2=A0=C2=A0Pacific Daylight Time (San Francisco, GMT-0= 7:00)
=C2=A0
Play recordi= ng=C2=A0(1 hr 8 min 20 sec)
Recording password: rVh6v6cm
=C2=A0
You can forward this message to others to allow them to play back the recor= ding.
=C2=A0
Additional options
Edit recordi= ng
Download rec= ording
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--001a114f4020c71dbf053dbd4339-- From nobody Fri Sep 30 10:53:36 2016 Return-Path: X-Original-To: bier@ietfa.amsl.com Delivered-To: bier@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 9786512B1A7 for ; Fri, 30 Sep 2016 10:53:34 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.699 X-Spam-Level: X-Spam-Status: No, score=-2.699 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-0.7, SPF_PASS=-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 aBfyRayS1aNm for ; Fri, 30 Sep 2016 10:53:33 -0700 (PDT) Received: from mail-qt0-x230.google.com (mail-qt0-x230.google.com [IPv6:2607:f8b0:400d:c0d::230]) (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 B089612B1A5 for ; Fri, 30 Sep 2016 10:53:32 -0700 (PDT) Received: by mail-qt0-x230.google.com with SMTP id 30so29785295qth.2 for ; Fri, 30 Sep 2016 10:53:32 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:reply-to:from:date:message-id:subject:to; bh=/R0gaWcUrifKhzzVDmV024sjq0DqaaXkCTf3yPwct3I=; b=iFpphi+zH55b440HPBm+rN68iTjXnY8KetvNHWrraXwjWl1+fRNFDc0ITVFmaPVFDT PiUIv95LCtAM/O7gt06phUFUPIPx24S5VRSJ9eJRcjqFYDoo0TBsf56MavxxoG9TWjlV f7CY+QgqtSe+QnoghCaSYDSNyIyRsSZXyTNXZU9wkl4KFotP136PimUoGpQSMdaCeHa3 r7dn0UcWXHFEUq78Mxvyt1mBZ6Nc05g14eBMpZ928bIlWC9Skz6pVprzcy0lJxH7POka 0v2O1lL/J5VA2C51eVsnAelqiwVXoy9Z8guTBC9wnlU54GmGiH/2VrJ+CfRtmu5/51yy aH0Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:reply-to:from:date:message-id :subject:to; bh=/R0gaWcUrifKhzzVDmV024sjq0DqaaXkCTf3yPwct3I=; b=j/uw0m/Pzm6s6Fba09SXGwgvGLj1Hpl9ibowN2q0Avpo/yMpMueAlFyKHNNM+aja2n J1QwK0NxUWJ1PbQuqwOz9tlNm+I42y/KN+qJWKThhBYdk07nNbGhUUsRZjvh4VYOPzoU h18F+z65Ka61NAeSWu0Z1Ax8hal1Jb2WEgFI1lxmfmecogD7yE9Nj9LeSXF3CWMrupwY OLwZSRx3FTu56+Vwsl4+qeg5OKUNaR9iwrTPi/M0hO0U4cBOGG5zi0l7P+iOPIOf14a3 VCEBmC2kK/8A+834kwXhLcmTTEt/NgUEqtyiU63SlqjGyggchJ2cqGM2j6S88pWbRBI6 yHMg== X-Gm-Message-State: AA6/9RmAW188mZicsQCb03COiR80jGvl94u63x31x2V366SAogYKJFr7Nhs9d+fp8CKq3aC3D3YziXEyQFaG6w== X-Received: by 10.200.39.151 with SMTP id w23mr8455899qtw.81.1475258011775; Fri, 30 Sep 2016 10:53:31 -0700 (PDT) MIME-Version: 1.0 Received: by 10.200.49.90 with HTTP; Fri, 30 Sep 2016 10:53:30 -0700 (PDT) From: Greg Shepherd Date: Fri, 30 Sep 2016 10:53:30 -0700 Message-ID: To: "bier@ietf.org" Content-Type: multipart/alternative; boundary=001a11414ee8be76ec053dbd4542 Archived-At: Subject: [Bier] Interim Day 3: WebEx recording is available for viewing: BIER WG Interim-20160929 1717-1 X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.17 Precedence: list Reply-To: gjshep@gmail.com List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 30 Sep 2016 17:53:34 -0000 --001a11414ee8be76ec053dbd4542 Content-Type: text/plain; charset=UTF-8 *From: * *Subject: **Your WebEx recording is available for viewing: BIER WG Interim-20160929 1717-1* *Date: *September 29, 2016 at 11:09:10 AM PDT *To: * *Reply-To: * Hi, Gregory Shepherd, Your recording is now available on your WebEx site. *BIER WG Interim-20160929 1717-1* Thursday, September 29, 2016 10:17 am | Pacific Daylight Time (San Francisco, GMT-07:00) *Play recording* (40 min 39 sec) Recording password: Zx2af28J You can forward this message to others to allow them to play back the recording. *Additional options* Edit recording Download recording Manage recordings View FAQ --001a11414ee8be76ec053dbd4542 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable


Subject: Your WebEx recording is available for viewing: BIER = WG Interim-20160929 1717-1
Date: September 29, 2016 at 11:09:10 AM PDT
Reply-To: <messenger@webex.com>

Hi, Gregory Shepherd,
Your recording is now available on your WebEx site.
=C2=A0
BIER WG Interim-20160929 1717-1
Thursday, September 29, 2016
10:17 am=C2=A0=C2=A0|=C2=A0=C2=A0Pacific Daylight Time (San Francisco, GMT-= 07:00)
=C2=A0
Play recordi= ng=C2=A0(40 min 39 sec)
Recording password: Zx2af28J
=C2=A0
You can forward this message to others to allow them to play back the recor= ding.
=C2=A0
Additional options
Edit recordi= ng
Download rec= ording
Manage recordings
View FAQ


--001a11414ee8be76ec053dbd4542-- From nobody Fri Sep 30 15:05:12 2016 Return-Path: X-Original-To: bier@ietfa.amsl.com Delivered-To: bier@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 2744E12B004 for ; Fri, 30 Sep 2016 15:05:11 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.7 X-Spam-Level: X-Spam-Status: No, score=-2.7 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_LOW=-0.7, SPF_PASS=-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 BYICIuSZqd8X for ; Fri, 30 Sep 2016 15:05:09 -0700 (PDT) Received: from mail-qk0-x22a.google.com (mail-qk0-x22a.google.com [IPv6:2607:f8b0:400d:c09::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 DD249126B6D for ; Fri, 30 Sep 2016 15:05:08 -0700 (PDT) Received: by mail-qk0-x22a.google.com with SMTP id j129so111990838qkd.1 for ; Fri, 30 Sep 2016 15:05:08 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:reply-to:from:date:message-id:subject:to; bh=xeaQKEdM2sBQaLpNvxZFXrnihUzZzPamw0O0Scu362A=; b=eB3HYEl8RAH3+d58gq7z39gAPE/w5IDaXY7HP+9e6ESCOdSzHDohsz0g7L4gGOvm4K fpI0jK80o7iq0Yata+QWrSFsFOfoYKZnffqMOR1SU6y+6QmiqO1PWKYkfdL2OobiQo4x 3+PpEEsNxFcKS+jODTTC3ZVtd5deW5borhHPRpJ4mlBeroWozLyGpsoEl2uY3dxaLoJE QNlVrVtBtsu60G6BtNwhjZdlKzsPTJy9WiLw3OfLizelsKTjnVbG1AUcNDp0UxfiSTSa imW5BoW4WtdGsdShAPUHlxKEAY2J7/pZXkSc86gZQx9rCyKOCeNO1U5X/J/t3WpJlY1r t1eA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:reply-to:from:date:message-id :subject:to; bh=xeaQKEdM2sBQaLpNvxZFXrnihUzZzPamw0O0Scu362A=; b=E4FcC0FK9T0tuQhIkOIuuEMpfm07GuBUeKWb98HWGQp+pFfU6fPzYjdKh78kL4ASLL 5Ve/inbVlwQxS3/kvcOjqslzC3CFsQ44T3yTyAtUE3/TTPgW4tNzNBlGsJIJvFIIbnn4 Wj4VUOoXExzbhDC9xc0a1UfAW8k2ttPnTinL39+3go4tkHqZdNi8AxgaMz23Xr6/kmOF mgl6zhyPmsPUv08GnRKeVuSOFaLtd9Bnlqsb3R1MbpfmEWtTD9+s4L7VAzI/ylq0EusV JhY2slFo/u+w6Tn+aX0LWpoT7oygPMCQpiVhUGq+dT01sGstSLzPQVT+J2XfcKXtCSo4 vGcQ== X-Gm-Message-State: AA6/9RnR09Ho2gRajJMMUFz0VAI6PQNS/V1Pey4CsXNBLnVGLyW+/eYNUw1u5ZEctJrVBvjaHEuTkOMPwWpnDA== X-Received: by 10.55.10.12 with SMTP id 12mr9028021qkk.209.1475273107903; Fri, 30 Sep 2016 15:05:07 -0700 (PDT) MIME-Version: 1.0 Received: by 10.200.49.90 with HTTP; Fri, 30 Sep 2016 15:05:07 -0700 (PDT) From: Greg Shepherd Date: Fri, 30 Sep 2016 15:05:07 -0700 Message-ID: To: "bier@ietf.org" Content-Type: text/plain; charset=UTF-8 Archived-At: Subject: [Bier] Interim WG Results - Direction X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.17 Precedence: list Reply-To: gjshep@gmail.com List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 30 Sep 2016 22:05:11 -0000 Thank you to everyone who participated in the Interim BIER WG Interim meeting / encap design team both in person and remote. I feel we were quite productive this week, and have moved the work along much faster than would have happened over email alone. The minutes and slides are all posted, and the links to the recordings have been sent out to the list. The summary results are posted below. Please read and review and provide any feedback on the direction recommendations for the WG at large. Chairs --------- IETF BIER WG Interim Meeting Sept 27-29, 2016 Recommendations for the WG direction 1) Unify encapsulation (MPLS, Eth, Generic) under MPLS Ethertype The interim reached the conclusion that the MPLS encapsulation can be carried into rfc5332 and with that the drafts eth/generic can be unified into one draft that suggests the necessary DSCP bit additions to it and explains how the label value can be used to encode SI/BSL/subdomain if so desired. This will solve the "BIER over ethernet" without any needs of a new encapsulation. Necessary discussions need to be closed whether rfc5332 is enough or some reason exists for a new EtherType carrying MPLS encapsulation inside for BIER has to be requested. On Tony P to unify the parties towards a draft and drive it forward towards suggested adoption by the WG. 2) BIER in-band membership signaling Both draft-pfister-bier-mld and draft-wang-bier-VXLAN outline a solution for signaling membership over the BIER domain by sending MLD/IGMP messages over BIER. Authors of both drafts to converge the work under a single draft. IJsbrand Wijnands Pierre Pfister (ppfister) 3) Host-to-host use-case and problem statement draft The interim agreed that host-to-first-BFR router or host-to-host and with that simplification of a host BIER API presents a valid and valuable work item and should be attacked by a problem statement draft/use-cases and suggestions for solutions, be it novel encaps or BFR-host mechanisms to achieve such an API. The results should be presented in the WG and further consensus sought with the group and AD as to adoption/further work. The use case statement should make distinction of the case of virtualized hosts in the data-center where a VM uses BIER uncap to indicate the replication desired inside its own VNI, and the case of the hypervisor using BIER to replicate packets to Network Virtualized Edges (NVEs) over a BIER underlay, and/or any translation, interaction or dependancies between the two cases. IJsbrand Wijnands Toerless Eckert Jeff Tantsura 4) Continue exploring IPv6 encoding w/ IETF IPv6 expert input Suggested IPv6 encapsulation was perceived during the interim as having lots of desired capabilities of a host L3 based encapsulation but will need exposure towards IPv6 flame keepers to ratify whether the implications on IPv6 architecture are viable and secure. A clear use-case statement to focus the discussion around the various components of the proposed solutions - i.e. being able to send traffic from outside the BIER domain without tunneling. The proposal and any progressing work needs input from the 6MAN WG. Pierre Pfister (ppfister) From nobody Fri Sep 30 15:15:31 2016 Return-Path: X-Original-To: bier@ietf.org Delivered-To: bier@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id 473701200DF; Fri, 30 Sep 2016 15:15:28 -0700 (PDT) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: "\"IETF Meeting Session Request Tool\"" To: X-Test-IDTracker: no X-IETF-IDTracker: 6.34.1 Auto-Submitted: auto-generated Precedence: bulk Message-ID: <147527372828.20369.10762179410612854136.idtracker@ietfa.amsl.com> Date: Fri, 30 Sep 2016 15:15:28 -0700 Archived-At: Cc: bier-chairs@ietf.org, bier@ietf.org Subject: [Bier] bier - New Meeting Session Request for IETF 97 X-BeenThere: bier@ietf.org X-Mailman-Version: 2.1.17 List-Id: "\"Bit Indexed Explicit Replication discussion list\"" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 30 Sep 2016 22:15:30 -0000 A new meeting session request has just been submitted by Alia Atlas, a RTG Area Director. --------------------------------------------------------- Working Group Name: Bit Indexed Explicit Replication Area Name: Routing Area Session Requester: Alia Atlas Number of Sessions: 1 Length of Session(s): 2 Hours Number of Attendees: 50 Conflicts to Avoid: First Priority: pim, rtgwg, detnet, homenet, Special Requests: Need to sanity check the conflicts with the chairs... ---------------------------------------------------------