From nobody Sat Feb 1 04:53:54 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 65EF012011D; Sat, 1 Feb 2020 04:53:52 -0800 (PST) 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, RCVD_IN_DNSWL_MED=-2.3, 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 SjUH8wguEL4i; Sat, 1 Feb 2020 04:53:49 -0800 (PST) Received: from huawei.com (lhrrgout.huawei.com [185.176.76.210]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 76D7C12004D; Sat, 1 Feb 2020 04:53:49 -0800 (PST) Received: from lhreml701-cah.china.huawei.com (unknown [172.18.7.108]) by Forcepoint Email with ESMTP id 16F1C570CD531FDC4362; Sat, 1 Feb 2020 12:53:47 +0000 (GMT) Received: from nkgeml702-chm.china.huawei.com (10.98.57.155) by lhreml701-cah.china.huawei.com (10.201.108.42) with Microsoft SMTP Server (TLS) id 14.3.408.0; Sat, 1 Feb 2020 12:53:46 +0000 Received: from nkgeml701-chm.china.huawei.com (10.98.57.156) by nkgeml702-chm.china.huawei.com (10.98.57.155) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.1713.5; Sat, 1 Feb 2020 20:53:43 +0800 Received: from nkgeml701-chm.china.huawei.com ([10.98.57.156]) by nkgeml701-chm.china.huawei.com ([10.98.57.156]) with mapi id 15.01.1713.004; Sat, 1 Feb 2020 20:53:43 +0800 From: "Dongjie (Jimmy)" To: Peter Psenak , "Acee Lindem (acee)" , "Ketan Talaulikar (ketant)" , "li_zhenqiang@hotmail.com" , Christian Hopps , lsr CC: lsr-ads , draft-li-lsr-ospfv3-srv6-extensions Thread-Topic: [Lsr] WG Adoption Call for draft-li-lsr-ospfv3-srv6-extensions Thread-Index: AQHV14JMHh/Aey/aZEyoCp93UXY3dqgC2WOAgAABa4CAAAbzAIAACfoAgAADZYCAA1rSgA== Date: Sat, 1 Feb 2020 12:53:43 +0000 Message-ID: <9b6c9ce47ec14ac7bc07e6c97ab53fb5@huawei.com> References: <795369E8-767A-4642-BA0E-36430F4DBF4E@cisco.com> <5A9AF6BD-A12E-4B6C-A3C5-0D7A9F1ACB3E@cisco.com> <96f6ac1c-a798-6524-5d11-f6879ea8426f@cisco.com> In-Reply-To: <96f6ac1c-a798-6524-5d11-f6879ea8426f@cisco.com> Accept-Language: en-US, zh-CN Content-Language: zh-CN X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.45.217.182] Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 MIME-Version: 1.0 X-CFilter-Loop: Reflected Archived-At: Subject: Re: [Lsr] WG Adoption Call for draft-li-lsr-ospfv3-srv6-extensions X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 01 Feb 2020 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(10.201.108.45) with Microsoft SMTP Server (TLS) id 14.3.408.0; Sat, 1 Feb 2020 13:04:20 +0000 Received: from nkgeml701-chm.china.huawei.com (10.98.57.156) by nkgeml702-chm.china.huawei.com (10.98.57.155) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.1713.5; Sat, 1 Feb 2020 21:04:17 +0800 Received: from nkgeml701-chm.china.huawei.com ([10.98.57.156]) by nkgeml701-chm.china.huawei.com ([10.98.57.156]) with mapi id 15.01.1713.004; Sat, 1 Feb 2020 21:04:17 +0800 From: "Dongjie (Jimmy)" To: "Ketan Talaulikar (ketant)" , "Acee Lindem (acee)" , "Peter Psenak (ppsenak)" , "li_zhenqiang@hotmail.com" , Christian Hopps , lsr CC: lsr-ads , draft-li-lsr-ospfv3-srv6-extensions Thread-Topic: [Lsr] WG Adoption Call for draft-li-lsr-ospfv3-srv6-extensions Thread-Index: AQHV14JMHh/Aey/aZEyoCp93UXY3dqgC2WOAgAABa4CAAAbzAIAACfoAgAADZYCAAAIEAIABPAWAgAACkoCAAAGlAIACHQYQ Date: Sat, 1 Feb 2020 13:04:17 +0000 Message-ID: <2968aae28d354053af7c1ee8ac749b48@huawei.com> References: <795369E8-767A-4642-BA0E-36430F4DBF4E@cisco.com> <5A9AF6BD-A12E-4B6C-A3C5-0D7A9F1ACB3E@cisco.com> <96f6ac1c-a798-6524-5d11-f6879ea8426f@cisco.com> <937DC961-3586-4B94-AEA2-78335063B920@cisco.com> <52BC9C22-858C-4EB2-BD9E-7BC6F542B3BD@cisco.com> In-Reply-To: Accept-Language: en-US, zh-CN Content-Language: zh-CN X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.45.217.182] Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 MIME-Version: 1.0 X-CFilter-Loop: Reflected Archived-At: Subject: Re: [Lsr] WG Adoption Call for draft-li-lsr-ospfv3-srv6-extensions X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 01 Feb 2020 13:04:28 -0000 SGkgS2V0YW4sIA0KDQpJIGFncmVlIHRoZSB0ZXh0IHByb3Bvc2VkIGJ5IEFjZWUgaXMgYmV0dGVy 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tbwexch24apd.uswin.ad.vzwcorp.com (153.114.162.48) with Microsoft SMTP Server (TLS) id 15.0.1473.3; Sun, 2 Feb 2020 09:14:29 -0500 Received: from scwexch16apd.uswin.ad.vzwcorp.com (153.114.130.35) by scwexch17apd.uswin.ad.vzwcorp.com (153.114.130.36) with Microsoft SMTP Server (TLS) id 15.0.1473.3; Sun, 2 Feb 2020 06:14:28 -0800 Received: from scwexch16apd.uswin.ad.vzwcorp.com ([153.114.130.35]) by scwexch16apd.uswin.ad.vzwcorp.com ([153.114.130.35]) with mapi id 15.00.1473.003; Sun, 2 Feb 2020 06:14:28 -0800 To: "Acee Lindem (acee)" , "chopps@chopps.org" , "lsr@ietf.org" CC: "rtg-ads@ietf.org" Thread-Topic: [Lsr] IS-IS Requirements for Area Abstraction (Corrected Alias for ADs) Thread-Index: AQHV2dMU0UnFyJmK/UWI2EoKxRyrnQ== Date: Sun, 2 Feb 2020 14:14:27 +0000 Message-ID: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: user-agent: Microsoft-MacOutlook/10.10.12.200112 x-ms-exchange-messagesentrepresentingtype: 1 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Gecko/20100101 Thunderbird/68.4.1 MIME-Version: 1.0 In-Reply-To: <122B138F-AA4F-4C7C-969C-755DF15F5744@chopps.org> Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Content-Language: en-US Archived-At: Subject: Re: [Lsr] WG Last Call draft-ietf-lsr-isis-srv6-extensions X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 02 Feb 2020 22:51:39 -0000 I am not aware of any IPR that has not been disclosed Ahmed On 1/21/20 4:14 PM, Christian Hopps wrote: > This begins a 2 week WG Last Call, ending after Feb 4, 2020, for draft-ietf-lsr-isis-srv6-extensions > > https://datatracker.ietf.org/doc/draft-ietf-lsr-isis-srv6-extensions/ > > Authors please indicate if you aware of any other IPR beyond what is posted: > > https://datatracker.ietf.org/ipr/3796/ > > Thanks, > Chris & Acee. > _______________________________________________ > Lsr mailing list > Lsr@ietf.org > https://www.ietf.org/mailman/listinfo/lsr From nobody Sun Feb 2 21:25:41 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 57C521208D8; Sun, 2 Feb 2020 21:25:40 -0800 (PST) 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, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=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 vdSlPtmxG2JN; Sun, 2 Feb 2020 21:25:38 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([2400:2200:420:753a:609d:34b3:d90:a892]) by smtp.gmail.com with ESMTPSA id r62sm19198792pfc.89.2020.02.02.21.25.35 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sun, 02 Feb 2020 21:25:36 -0800 (PST) Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Mime-Version: 1.0 (1.0) From: Satoru Matsushima In-Reply-To: Cc: Christian Hopps , lsr-ads@ietf.org, "Acee Lindem (acee)" Date: Mon, 3 Feb 2020 14:25:33 +0900 Message-Id: <1107A56F-086C-4A36-9EE9-F5968C8900DF@gmail.com> References: To: lsr@ietf.org X-Mailer: iPad Mail (17C54) Archived-At: Subject: Re: [Lsr] WG Last Call draft-ietf-lsr-isis-srv6-extensions X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 03 Feb 2020 05:25:40 -0000 I support the WGLC to move this doc forward. And as a contributor, I=E2=80=99m not aware of any IPR that has not been dis= closed. cheers, --satoru > On 1/21/20 4:14 PM, Christian Hopps wrote: > This begins a 2 week WG Last Call, ending after Feb 4, 2020, for draft-iet= f-lsr-isis-srv6-extensions >=20 > https://datatracker.ietf.org/doc/draft-ietf-lsr-isis-srv6-extensions/ >=20 > Authors please indicate if you aware of any other IPR beyond what is poste= d: >=20 > https://datatracker.ietf.org/ipr/3796/ >=20 > Thanks, > Chris & Acee. > _______________________________________________ > Lsr mailing list > Lsr@ietf.org > https://www.ietf.org/mailman/listinfo/lsr From nobody Mon Feb 3 01:08:22 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 6EAD212086A; Mon, 3 Feb 2020 01:08:20 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -14.502 X-Spam-Level: X-Spam-Status: No, score=-14.502 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, RCVD_IN_DNSWL_HI=-5, 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 N_6f__Ignx-b; Mon, 3 Feb 2020 01:08:17 -0800 (PST) Received: from aer-iport-1.cisco.com (aer-iport-1.cisco.com [173.38.203.51]) (using TLSv1.2 with cipher DHE-RSA-SEED-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id DEB9F120906; Mon, 3 Feb 2020 01:08:16 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=17514; q=dns/txt; s=iport; t=1580720897; x=1581930497; h=subject:to:cc:references:from:message-id:date: mime-version:in-reply-to:content-transfer-encoding; bh=6rDzw4tI0+1ClgMivFOiTu6yQRTaKvq6dfOdA3fOWYU=; b=FMx4q5UsyugcisOdDJNy2DzXAY1dCfA9NSzUzqpX0NwieYjbGdiWFC2y PD6FWY+h64k0yY49lqm6PlOhV1BHMXq3pA2q6+P0Vnzx03Ld2nxqMuClL SRANjRTdtKh4JG+dCmu7WGIxJfqyIV58XRrfEOVi3arMuvhVGHO91/GNn c=; X-IronPort-AV: E=Sophos;i="5.70,397,1574121600"; d="scan'208";a="22900314" Received: from aer-iport-nat.cisco.com (HELO aer-core-3.cisco.com) ([173.38.203.22]) by aer-iport-1.cisco.com with ESMTP/TLS/DHE-RSA-SEED-SHA; 03 Feb 2020 09:08:15 +0000 Received: from [10.60.140.52] (ams-ppsenak-nitro3.cisco.com [10.60.140.52]) by aer-core-3.cisco.com (8.15.2/8.15.2) with ESMTP id 01398Dtu009143; Mon, 3 Feb 2020 09:08:14 GMT To: "Dongjie (Jimmy)" , "Acee Lindem (acee)" , "Ketan Talaulikar (ketant)" , "li_zhenqiang@hotmail.com" , Christian Hopps , lsr Cc: lsr-ads , draft-li-lsr-ospfv3-srv6-extensions References: <795369E8-767A-4642-BA0E-36430F4DBF4E@cisco.com> <5A9AF6BD-A12E-4B6C-A3C5-0D7A9F1ACB3E@cisco.com> <96f6ac1c-a798-6524-5d11-f6879ea8426f@cisco.com> <9b6c9ce47ec14ac7bc07e6c97ab53fb5@huawei.com> From: Peter Psenak Message-ID: Date: Mon, 3 Feb 2020 10:08:13 +0100 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:60.0) Gecko/20100101 Thunderbird/60.7.0 MIME-Version: 1.0 In-Reply-To: <9b6c9ce47ec14ac7bc07e6c97ab53fb5@huawei.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit X-Outbound-SMTP-Client: 10.60.140.52, ams-ppsenak-nitro3.cisco.com X-Outbound-Node: aer-core-3.cisco.com Archived-At: Subject: Re: [Lsr] WG Adoption Call for draft-li-lsr-ospfv3-srv6-extensions X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 03 Feb 2020 09:08:20 -0000 Hi Jie, please see inline: On 01/02/2020 13:53, Dongjie (Jimmy) wrote: > Hi Peter, > > Please see some comments inline: > >> -----Original Message----- >> From: Lsr [mailto:lsr-bounces@ietf.org] On Behalf Of Peter Psenak >> Sent: Friday, January 31, 2020 1:24 AM >> To: Acee Lindem (acee) ; Ketan Talaulikar (ketant) >> ; li_zhenqiang@hotmail.com; Christian Hopps >> ; lsr >> Cc: lsr-ads ; draft-li-lsr-ospfv3-srv6-extensions >> >> Subject: Re: [Lsr] WG Adoption Call for draft-li-lsr-ospfv3-srv6-extensions >> >> Hi Acee, >> >> On 30/01/2020 18:12, Acee Lindem (acee) wrote: >>> Hi Peter, >>> >>> On 1/30/20, 11:36 AM, "Peter Psenak" wrote: >>> >>> Hi Acee, >>> >>> On 30/01/2020 17:11, Acee Lindem (acee) wrote: >>> > Hi Ketan, >>> > >>> > In that case, it doesn’t make sense to include it in the End.X >>> > advertisement since you need to look it up to check it anyway. I >> don’t >>> > see any benefit here. >>> The benefit is to make sure that the END.X SID that was configured for >>> the algo X is covered by the locator that has the same algo. >>> >>> If you do not advertise the algo with END.X SID, you have no way of >>> checking that on rcv side. >>> >>> Ok - so it is to verify that algorithm for the adjacency matches that algorithm >> for the longest match locator - which may be advertised by a >different >> OSPFv3 router. Correct? >> >> yes. > > In what scenarios will the longest match locator of the END.X SID be advertised by a different router? Does this only happen due to bug or misconfiguration? it's not the different OSPFv3 router, it's a different LSA/LSP. > >> >> >>> I guess I don't see why the algorithm for the END.X SID just isn't defined as >> the algorithm from the longest match locator. That way, everyone in >the area >> would use the same one and there would be less that could go wrong. What >> am I missing? >> >> locators may change over time. During the reconfiguration a END.X SID may >> wrongly be associated with the incorrect locator from a different algo. > > In this case just checking the algorithm may not be enough, if the algorithm happens to be the same, will the END.X SID be considered valid and be used by transit nodes to route towards the originator of the incorrect locator? Some mechanism needs to be considered to avoid using invalid END.X SIDs in such case. if the algo is the same, then the locator is correct. What else do you want to check? thanks, Peter > > Best regards, > Jie > >> Also if for some reason the right locator is not advertised (due to a bug on the >> originator), END.X SID traffic may be sent using a wrong algo. We wanted to >> avoid it as that can be seen as a security issue. >> >> thanks, >> Peter >> >> >> >>> >>> Thanks, >>> Acee >>> >>> >>> thanks, >>> Peter >>> >>> > >>> > Thanks, >>> > >>> > Acee >>> > >>> > *From: *"Ketan Talaulikar (ketant)" >>> > *Date: *Thursday, January 30, 2020 at 11:06 AM >>> > *To: *Acee Lindem , "li_zhenqiang@hotmail.com" >>> > , Christian Hopps >> , lsr >>> > >>> > *Cc: *draft-li-lsr-ospfv3-srv6-extensions >>> > , lsr-ads >> >>> > *Subject: *RE: [Lsr] WG Adoption Call for >>> > draft-li-lsr-ospfv3-srv6-extensions >>> > >>> > Hi Acee/Zhen, >>> > >>> > The sec 8 of the draft has the following text which specifies the >>> > handling of this condition. >>> > >>> > All End.X SIDs MUST be subsumed by the subnet of a Locator >> with the >>> > >>> > matching algorithm which is advertised by the same node in an >> SRv6 >>> > >>> > Locator TLV. End.X SIDs which do not meet this requirement >> MUST be >>> > >>> > ignored. >>> > >>> > Thanks, >>> > >>> > Ketan >>> > >>> > *From:* Acee Lindem (acee) >>> > *Sent:* 30 January 2020 21:01 >>> > *To:* li_zhenqiang@hotmail.com; Ketan Talaulikar (ketant) >>> > ; Christian Hopps ; lsr >> >>> > *Cc:* draft-li-lsr-ospfv3-srv6-extensions >>> > ; lsr-ads >> >>> > *Subject:* Re: [Lsr] WG Adoption Call for >>> > draft-li-lsr-ospfv3-srv6-extensions >>> > >>> > Hi Ketan, Zhen, >>> > >>> > What happens if there an algorithm conflict between the Adjacency >> END.X >>> > SID and the longest match Locator SID? Either one has to take >> precedence >>> > or this is an error condition. In either case, it needs to be >> documented. >>> > >>> > Thanks, >>> > >>> > Acee >>> > >>> > *From: *"li_zhenqiang@hotmail.com >> " >>> > > >>> > *Date: *Thursday, January 30, 2020 at 10:20 AM >>> > *To: *"Ketan Talaulikar (ketant)" >> > >, Christian Hopps >> > >, lsr > > >>> > *Cc: *draft-li-lsr-ospfv3-srv6-extensions >>> > >> > >, lsr-ads >>> > >, Christian Hopps >>> > >, Acee Lindem >>> > > >>> > *Subject: *Re: RE: [Lsr] WG Adoption Call for >>> > draft-li-lsr-ospfv3-srv6-extensions >>> > >>> > For the third concern, I think it is better to list the considerations >>> > behind the format design of the TLVs to help readers understand >> them >>> > better. For the specification behavior you mention, this doc SHOULD >>> > specify it explicitly. >>> > >>> > By the way, what a router should do when it receives END.X SID >>> > containing algorithm that is different from the one carried in the >>> > convering locator? >>> > >>> > Best Regards, >>> > >>> > Zhenqiang Li >>> > >>> > ------------------------------------------------------------------------ >>> > >>> > li_zhenqiang@hotmail.com >>> > >>> > *From:*Ketan Talaulikar (ketant) >>> > >>> > *Date:* 2020-01-30 16:44 >>> > >>> > *To:*li_zhenqiang@hotmail.com >> ; >>> > Christian Hopps ; lsr >> >>> > >>> > *CC:*draft-li-lsr-ospfv3-srv6-extensions >>> > ; lsr-ads >>> > ; Christian Hopps >>> > ; Acee Lindem (acee) >> >>> > >>> > *Subject:* RE: RE: [Lsr] WG Adoption Call for >>> > draft-li-lsr-ospfv3-srv6-extensions >>> > >>> > Please check inline again. >>> > >>> > *From:* li_zhenqiang@hotmail.com >> >>> > > > >>> > *Sent:* 30 January 2020 13:46 >>> > *To:* Ketan Talaulikar (ketant) >> > >; Christian Hopps >> >> > >; lsr > > >>> > *Cc:* draft-li-lsr-ospfv3-srv6-extensions >>> > >> > >; lsr-ads >>> > >; Christian Hopps >>> > >; Acee >> Lindem (acee) >>> > > >>> > *Subject:* Re: RE: [Lsr] WG Adoption Call for >>> > draft-li-lsr-ospfv3-srv6-extensions >>> > >>> > Thank you KT for your quick response. Please see my reply >> begins >>> > with [ZQ]. >>> > >>> > Best Regards, >>> > >>> > Zhenqiang Li >>> > >>> > ------------------------------------------------------------------------ >>> > >>> > li_zhenqiang@hotmail.com >> >>> > >>> > *From:*Ketan Talaulikar (ketant) >> >>> > >>> > *Date:* 2020-01-30 13:42 >>> > >>> > *To:*li_zhenqiang@hotmail.com >> ; >>> > Christian Hopps ; lsr >>> > >>> > >>> > *CC:*draft-li-lsr-ospfv3-srv6-extensions >>> > ; >> lsr-ads >>> > ; Christian Hopps >>> > ; Acee Lindem (acee) >>> > >>> > >>> > *Subject:* RE: [Lsr] WG Adoption Call for >>> > draft-li-lsr-ospfv3-srv6-extensions >>> > >>> > Hello Zhenqiang Li, >>> > >>> > Thanks for your review and comments. Please check inline >> below. >>> > >>> > *From:*li_zhenqiang@hotmail.com >>> > >> >> > > >>> > *Sent:* 30 January 2020 08:46 >>> > *To:* Christian Hopps >> > >; lsr >> > > >>> > *Cc:* draft-li-lsr-ospfv3-srv6-extensions >>> > >> > >; >> lsr-ads >>> > >; Christian >> Hopps >>> > >; >> Acee Lindem >>> > (acee) > >>> > *Subject:* Re: [Lsr] WG Adoption Call for >>> > draft-li-lsr-ospfv3-srv6-extensions >>> > >>> > support the adoption with the following comments. >>> > >>> > 1. What does SRH stack mean in section 4.2? AS specified >> in >>> > RFC8200 and draft-ietf-6man-segment-routing-header, >> only one SRH >>> > can be presented in one IPv6 header. >>> > >>> > */[KT] Thanks for catching this error and will fix as >> below:/* >>> > >>> > *//* >>> > >>> > */OLD: /*The Maximum End Pop MSD Type specifies the >> maximum number of SIDs in >>> > >>> > the top SRH in an SRH stack to which the router can >> apply >>> > Penultimate >>> > >>> > Segment Pop (PSP) or Ultimate Segment Pop (USP) >>> > >>> > *//* >>> > >>> > */NEW:/*The Maximum End Pop MSD Type specifies the >> maximum number of SIDs in >>> > >>> > the SRH for which the router can apply Penultimate >>> > >>> > Segment Pop (PSP) or Ultimate Segment Pop (USP) >>> > >>> > >>> > >>> > >>> > [ZQ] Fine. >>> > >>> > 2. The abbreviations used in this draft should be listed in a >>> > seperated section or point out where they are defined. >>> > >>> > */[KT] We’ve followed the convention of expanding on >> first use >>> > as also providing reference where necessary. Please do let >> know >>> > if we’ve missed doing so anywhere./* >>> > >>> > [ZQ] Some examples: SPF computation in secction 5, TBD >> in >>> > section 2. >>> > >>> > */[KT] Will expand SPF and some other such on first use :-). >> The >>> > TBD (to be decided) is for use until the code point are >>> > allocated by IANA./* >>> > >>> > 3. Algorithm field is defined for End.x SID to carry the >>> > algorithm the end.x sid associates. But no algorithm field is >>> > defined for End SID in section 7. May I know the reason? >>> > >>> > */[KT] The SRv6 Locator TLV that is the parent of the SRv6 >> End >>> > SID Sub-TLV carries the algorithm and hence there is no >> need to >>> > repeat in the Sub-TLV. This is not the case for SRv6 End.X >> SID >>> > Sub-TLV and hence it has the algorithm field./* >>> > >>> > */ >>> > >>> > >>> > /* >>> > >>> > [ZQ] Make sense but still a little bit weird. Since any SID >>> > belongs to a locator, or it is not routable, the algorithm >> field >>> > in the end.x sid is not needed, end.x sid associates the >>> > algorithm carried in the corresponding locator tlv. >>> > >>> > */[KT] Having an algorithm field advertised with the End.X >> SID >>> > makes it easier for implementation to find the algorithm >>> > specific End.X SID without making the longest prefix match >> on >>> > all locators advertised by the node to find the algorithm to >>> > which the SID belongs. It also makes it possible to verify >> that >>> > the algorithm associated with the End.X SID matches that >> of the >>> > covering Locator when the link advertisement with End.X >> SID is >>> > received. /* >>> > >>> > *//* >>> > >>> > */Thanks,/* >>> > >>> > */Ketan/* >>> > >>> > *//* >>> > >>> > */Thanks,/* >>> > >>> > */Ketan/* >>> > >>> > Best Regards, >>> > >>> > Zhenqiang Li >>> > >>> > ------------------------------------------------------------------------ >>> > >>> > li_zhenqiang@hotmail.com >> >>> > >>> > *From:*Christian Hopps >> >>> > >>> > *Date:* 2020-01-24 04:24 >>> > >>> > *To:*lsr >>> > >>> > *CC:*draft-li-lsr-ospfv3-srv6-extensions >>> > ; >>> > lsr-ads ; Christian Hopps >>> > ; Acee Lindem \(acee\) >>> > >>> > >>> > *Subject:* [Lsr] WG Adoption Call for >>> > draft-li-lsr-ospfv3-srv6-extensions >>> > >>> > Hi LSR WG and Draft Authors, >>> > >>> > The authors originally requested adoption back @ >> 105; >>> > however, some comments were received and new >> version was >>> > produced. Moving forward... >>> > >>> > This begins a 2 week WG adoption poll for the >> following draft: >>> > >>> > >> https://datatracker.ietf.org/doc/draft-li-lsr-ospfv3-srv6-extensions/ >>> > >>> > Please indicate your support or objection by Feb 6, >> 2020. >>> > >>> > Authors, please respond indicating whether you are >> aware of >>> > any IPR that applies to this draft. >>> > >>> > Thanks, >>> > >>> > Chris & Acee. >>> > >>> > >> _______________________________________________ >>> > >>> > Lsr mailing list >>> > >>> > Lsr@ietf.org >>> > >>> > https://www.ietf.org/mailman/listinfo/lsr >>> > >>> >>> >>> >>> >>> >> >> _______________________________________________ >> Lsr mailing list >> Lsr@ietf.org >> https://www.ietf.org/mailman/listinfo/lsr > > From nobody Mon Feb 3 05:39:46 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id D32C512004E; Mon, 3 Feb 2020 05:39:44 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -14.502 X-Spam-Level: X-Spam-Status: No, score=-14.502 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIMWL_WL_MED=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, RCVD_IN_DNSWL_HI=-5, 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 AMwSoqYVO8_W; Mon, 3 Feb 2020 05:39:42 -0800 (PST) Received: from aer-iport-1.cisco.com (aer-iport-1.cisco.com [173.38.203.51]) (using TLSv1.2 with cipher DHE-RSA-SEED-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 8A430120059; Mon, 3 Feb 2020 05:39:41 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=11765; q=dns/txt; s=iport; t=1580737181; x=1581946781; h=subject:to:cc:references:from:message-id:date: mime-version:in-reply-to:content-transfer-encoding; bh=xf/DhpJWeUEDH/czz0zcsWtCF3YUAR9UGGKbIRBI5YA=; b=Nan+LJa5V+01eRgY4HgeetWxa+UlOj6ByQdca8RgpP6qloKQo0jCmjjv ewB2zclmJL6sWEmjuShXooCwv7CXcIWNsPTpCD7TPBJMDXnocbf2o0dPg IHJNCSgB/LxH4WqyWKB/FZymY/lPNYkcT6hYzOsoQIp+yoYfAtXX9MhPS g=; X-IronPort-AV: E=Sophos;i="5.70,398,1574121600"; d="scan'208";a="22907815" Received: from aer-iport-nat.cisco.com (HELO aer-core-2.cisco.com) ([173.38.203.22]) by aer-iport-1.cisco.com with ESMTP/TLS/DHE-RSA-SEED-SHA; 03 Feb 2020 13:39:39 +0000 Received: from [10.60.140.52] (ams-ppsenak-nitro3.cisco.com [10.60.140.52]) by aer-core-2.cisco.com (8.15.2/8.15.2) with ESMTP id 013Ddcbe022144; Mon, 3 Feb 2020 13:39:38 GMT To: Chris Bowers , "Les Ginsberg (ginsberg)" Cc: lsr@ietf.org, lsr-ads@ietf.org, Christian Hopps , "Acee Lindem (acee)" References: <122B138F-AA4F-4C7C-969C-755DF15F5744@chopps.org> From: Peter Psenak Message-ID: <86b274ad-e26b-029b-a36f-01febc03027a@cisco.com> Date: Mon, 3 Feb 2020 14:39:38 +0100 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:60.0) Gecko/20100101 Thunderbird/60.7.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit X-Outbound-SMTP-Client: 10.60.140.52, ams-ppsenak-nitro3.cisco.com X-Outbound-Node: aer-core-2.cisco.com Archived-At: Subject: Re: [Lsr] WG Last Call draft-ietf-lsr-isis-srv6-extensions X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 03 Feb 2020 13:39:45 -0000 Hi Chris, adding to what Les has said. Please see inline (##PP) On 31/01/2020 21:10, Chris Bowers wrote: > Peter and Les, > > It seems to me that for the Node Flag in RFC7794 and the proposed > Anycast Flag > > in draft-ietf-lsr-isis-srv6-extensions-04, we are ultimately concerned with > > how to identify IGP-Node Segments and IGP-Anycast Segments, as defined > in RFC8402, > > the Segment Routing Architecture document. > > If this is the case, then the following text from RFC8402 is very relevant. > > ============ > > 3.2.  IGP-Node Segment (Node-SID) > >    An IGP Node-SID MUST NOT be associated with a prefix that is owned by > >    more than one router within the same routing domain. > > 3.3.  IGP-Anycast Segment (Anycast-SID) > >    .... > >    An IGP-Anycast segment MUST NOT reference a particular node. > >    ..... > > ============ > > This text can be interpreted in two different ways. > > Interpretation I) > > A prefix-SID can have the following three possible states. > > Ia) Node-SID > > Ib) Anycast-SID > > Ic) neither Node-SID nor Anycast-SID ##PP Prefix can either be Node Prefix, Anycast Prefix or neither of them. > > Interpretation II) > > A prefix-SID can have the following two possible states. > > IIa) Node-SID > > IIb) Anycast-SID > > If Interpretation I) is correct, then I think that the current encodings in > > draft-ietf-lsr-isis-srv6-extensions-04 do not allow us > > to unambiguously identify a Node-SID for a non-/128 > > prefix/locator.  For example, the End-SIDs within a /64 locator with the > A-flag set could > > either be Ia) a Node-SID ##PP rfc7794 does not allow the N-flag to be set for non-/128 prefix, so above is not possible for /64 locator at the moment. If the A-flag is set, it is an anycast locator. >or Ic) neither Node-SID nor Anycast-SID. ##PP if the A-flag was not set for /64 locator, above would be correct, but given that the A-flag is set, it is clearly just Anycast locator. > > I think a reasonable solution would be to remove the restriction > > on the N-flag to allow it to be used for non-/128 prefixes/locators.  This > > would allow the three possible prefix-SIDs states to be easily represented. ##PP right, that could be a possibility, which would allow SRv6 locator to have the "node" property, as locators are never /128. thanks, Peter > > If Interpretation II) is correct, then I think that the current > encodings in > > draft-ietf-lsr-isis-srv6-extensions-04 need clarification with respect to > > how to interpret a /128 prefix/locator advertisement with N=0, A=0. We > > have to decide between interpreting the End-SIDs within the locator > > as either Node-SIDs or Anycast-SIDs, since there is no third option. > > I think that interpreting the End-SIDs as Anycast-SIDs in the N=0, A=0 > > case is preferable because it preserves backwards compatibility. > > > Thanks, > > Chris > > > > On Thu, Jan 30, 2020 at 4:02 AM Peter Psenak > wrote: > > Hi Chris, > > please see inline (##PP) > > On 29/01/2020 17:25, Chris Bowers wrote: > > I would like to proposed the following text to make section 6 > more clear. > > > > Thanks, > > Chris > > > > ==================== > > > >   (existing text) > > > > > > 6.  Advertising Anycast Property > > > >     Both prefixes and SRv6 Locators may be configured as anycast > and as > > > >     such the same value can be advertised by multiple routers.  It is > > > >     useful for other routers to know that the advertisement is for an > > > >     anycast identifier. > > > >     A new flag in "Bit Values for Prefix Attribute Flags Sub-TLV" > > > >     registry [RFC7794] is defined to advertise the anycast property: > > > >         Bit #: 4 (Suggested - to be assigned by IANA) > > > >         Name: Anycast Flag (A-flag) > > > >         When the prefix/SRv6 locator is configured as anycast, > the A-flag > > > >         SHOULD be set. Otherwise, this flag MUST be clear. > > > >     The A-flag MUST be preserved when leaked between levels. > > > >     The A-flag and the N-flag MUST NOT both be set. > > > > ==== start insert new text ======= > > > > > > Certain use cases require prefixes/locators that uniquely belong > to a node. > > > > Since prefixes/locators which are not /128 should not have the N > bit set, > > > > this node local uniqueness is decided based on A bit for non-/128 > prefixes. > > ##PP > above does not seem correct. Above seems to imply that for non-/128 > prefix, A-bit is replacement of N-bit. > > A-bit applies to both /128 and non-/128 prefixes equally. > > Current draft clearly states what to do when both N a A bits are set. > > > > > > >     When a prefix/locator iscategorized as anycast, it does not > uniquely > > belong > > > >     to a node and cannot be used for such use cases.  The rules > below > > specify > > > >     how to determine whether or not a prefix/locator should be > treated > > as anycast > > > >     in various situations. > > > > > >     [RFC7794] contains the following restriction on the > interpretation of the N-flag. > > > >     "If the flag is set and the prefix length is NOT a host prefix > > > >      (/32 for IPV4, /128 forIPv6), then the flag MUST be ignored." > > > >     The current document does NOT modify this restriction on the > interpretation of > > > >     the N-flag imposed by [RFC7794]. > > ##PP > I don't think above text is needed. And I don't think above is > completely correct, as we define a new case in which the N-bit > should be > ignored (when A-bit is set). > > > > > >     For a prefix/SRv6 Locator advertisement with a /128 > prefix/locator, > > > >     if both N-flag and A-flag are set, the receiving router MUST > treat the > > > >     prefix advertisement as anycast. > > ##PP > we have following text in the draft already: > > "If both N-flag and A-flag are set in the prefix/SRv6 Locator >     advertisement, the receiving routers MUST ignore the N-flag." > > > > > > >     For a prefix/SRv6 Locator advertisement with a /128 > prefix/locator, > > > >     if the N-flag and A-flag are NOT set, the receiving routers > > > >     MUST treat the prefix advertisement as anycast.. > > ##PP > I don't think above statement is correct. Why a node cannot advertise a > /128 prefix which is not an anycast one and does not have a N-bit set? > > > > > This rule ensures the > > > >     correct interpretation of a prefix advertisement originated by > > > >     a router that is not SRv6 capable and originates a legacy > > > >     Prefix Attribute Flags Sub-TLV based on [RFC7794] alone. > > > >     For a prefix/SRv6 Locator advertisement with a prefix/locator > that > > > >     is NOT /128, the N-flag must be ignored, so the setting of the > > > >     A-flag determines the anycast treatment of the prefix > advertisement. > > ##PP > A-flag does that regardless of the length of the prefix. > > > > > >     The Prefix Attribute Flags Sub-TLV can be carried in the SRv6 > > Locator TLV > > > >     as well as the Prefix Reachability TLVs.  When a router > originates > > > >     both the Prefix Reachability TLV and the SRv6 Locator TLV for > a given > > > >     prefix, and the router is originating the Prefix Attribute > Flags Sub-TLV > > > >     in one of the TLVs, the router SHOULD advertise identical > versions of the > > > >     Prefix Attribute Flags Sub-TLV in both TLVs. > > ##PP > Above seems a good suggestion. Will add it. > > > > > > > > >     If a router receives one Prefix Attribute Flags Sub-TLV in the > > > >     Prefix Reachability TLV and another in the SRv6 Locator TLV, > the router should > > > >     use the prefix attribute flags received in the Prefix > Reachability TLV. > > ##PP > above contradicts what you suggest in the previous paragraph, where you > suggest we need to advertise with both prefix and locator, and here you > suggest we ignore what we received in the locator. > > Are you talking about the case where the content of the Prefix > Attribute > Flags Sub-TLV is different in prefix vs locator? > > > > > > > >     If a router receives a Prefix Attribute Flags Sub-TLV in the > > > >     Prefix Reachability TLV but not in the SRv6 Locator TLV, the > router should > > > >     use the prefix attribute flags received in the Prefix > Reachability TLV. > > ##PP > do we really need this? If the originator does the right thing, then we > don't have the problem. Cross referencing data between different TLVs > complicates the implementations. > > > > > > > > > >     If a router receives a Prefix Attribute Flags Sub-TLV in the > > > >     SRv6 Locator TLV but not in the Prefix Reachability TLV, > > > >     the router should use the prefix attribute flags received in > the SRv6 Locator TLV. > > ##PP > same as above. > > thanks, > Peter > > > > > ==== end insert new text ========= > > > >     The same prefix/SRv6 Locator can be advertised by multiple > routers. > > > >     If at least one of them sets the A-Flag in its advertisement, the > > > >     prefix/SRv6 Locator SHOULD be considered as anycast.. > > > > > > > > =================== > > > > > > On Tue, Jan 21, 2020 at 6:15 PM Christian Hopps > > > >> wrote: > > > >     This begins a 2 week WG Last Call, ending after Feb 4, 2020, for > >     draft-ietf-lsr-isis-srv6-extensions > > > > > https://datatracker.ietf..org/doc/draft-ietf-lsr-isis-srv6-extensions/ > > >   > > > >     Authors please indicate if you aware of any other IPR beyond > what is > >     posted: > > > > https://datatracker.ietf.org/ipr/3796/ > > > >     Thanks, > >     Chris & Acee. > >     _______________________________________________ > >     Lsr mailing list > > Lsr@ietf.org > > > https://www.ietf.org/mailman/listinfo/lsr > > > From nobody Mon Feb 3 06:36:33 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id E2D091200B2; Mon, 3 Feb 2020 06:36:30 -0800 (PST) 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, RCVD_IN_DNSWL_MED=-2.3, 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 7GY5AxWOBRMf; Mon, 3 Feb 2020 06:36:27 -0800 (PST) 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15.01.1713.004; Mon, 3 Feb 2020 22:36:21 +0800 From: "Dongjie (Jimmy)" To: Peter Psenak , "Acee Lindem (acee)" , "Ketan Talaulikar (ketant)" , "li_zhenqiang@hotmail.com" , Christian Hopps , lsr CC: lsr-ads , draft-li-lsr-ospfv3-srv6-extensions Thread-Topic: [Lsr] WG Adoption Call for draft-li-lsr-ospfv3-srv6-extensions Thread-Index: AQHV14JMHh/Aey/aZEyoCp93UXY3dqgC2WOAgAABa4CAAAbzAIAACfoAgAADZYCAA1rSgIACY9mAgADY2sA= Date: Mon, 3 Feb 2020 14:36:21 +0000 Message-ID: <6868a340cbe94576851b8ce0277c3c24@huawei.com> References: <795369E8-767A-4642-BA0E-36430F4DBF4E@cisco.com> <5A9AF6BD-A12E-4B6C-A3C5-0D7A9F1ACB3E@cisco.com> <96f6ac1c-a798-6524-5d11-f6879ea8426f@cisco.com> <9b6c9ce47ec14ac7bc07e6c97ab53fb5@huawei.com> In-Reply-To: Accept-Language: en-US, zh-CN Content-Language: zh-CN X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.45.215.199] Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 MIME-Version: 1.0 X-CFilter-Loop: Reflected Archived-At: Subject: Re: [Lsr] WG Adoption Call for draft-li-lsr-ospfv3-srv6-extensions X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 03 Feb 2020 14:36:31 -0000 SGkgUGV0ZXIsIA0KDQpUaGFua3MgZm9yIHlvdXIgcmVwbHkuIFBsZWFzZSBzZWUgaW5saW5lOg0K DQo+IC0tLS0tT3JpZ2luYWwgTWVzc2FnZS0tLS0tDQo+IEZyb206IFBldGVyIFBzZW5hayBbbWFp bHRvOnBwc2VuYWtAY2lzY28uY29tXQ0KPiBTZW50OiBNb25kYXksIEZlYnJ1YXJ5IDMsIDIwMjAg NTowOCBQTQ0KPiBUbzogRG9uZ2ppZSAoSmltbXkpIDxqaWUuZG9uZ0BodWF3ZWkuY29tPjsgQWNl ZSBMaW5kZW0gKGFjZWUpDQo+IDxhY2VlQGNpc2NvLmNvbT47IEtldGFuIFRhbGF1bGlrYXIgKGtl dGFudCkgPGtldGFudEBjaXNjby5jb20+Ow0KPiBsaV96aGVucWlhbmdAaG90bWFpbC5jb207IENo cmlzdGlhbiBIb3BwcyA8Y2hvcHBzQGNob3Bwcy5vcmc+OyBsc3INCj4gPGxzckBpZXRmLm9yZz4N Cj4gQ2M6IGxzci1hZHMgPGxzci1hZHNAaWV0Zi5vcmc+OyBkcmFmdC1saS1sc3Itb3NwZnYzLXNy 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localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 7nEn0INxi1r1; Mon, 3 Feb 2020 06:44:14 -0800 (PST) Received: from aer-iport-3.cisco.com (aer-iport-3.cisco.com [173.38.203.53]) (using TLSv1.2 with cipher DHE-RSA-SEED-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 91F39120044; Mon, 3 Feb 2020 06:44:13 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=20514; q=dns/txt; s=iport; t=1580741054; x=1581950654; h=subject:to:cc:references:from:message-id:date: mime-version:in-reply-to:content-transfer-encoding; bh=xbsovQ+ZRdZs2Vr0XOlLmOKNQApGlUx5ou426w6JgcE=; b=LNSdcM3tWqGhtdomBHAIDoSM6+wWLxp2iu6SiElRwr8xbD5Sapz9w5Xh MXqAr6FpCotr45yYKAHdJBU4+zI2uAEzrWg10wwgxhBjk0xwBTLgkSydC NaIgAxp4XCZTmsYGef1I9NI8C+1QDMpQEyD21HdE20UPG4tPG9pveZas6 M=; X-IronPort-AV: E=Sophos;i="5.70,398,1574121600"; d="scan'208";a="20590778" Received: from aer-iport-nat.cisco.com (HELO aer-core-4.cisco.com) ([173.38.203.22]) by aer-iport-3.cisco.com with ESMTP/TLS/DHE-RSA-SEED-SHA; 03 Feb 2020 14:44:11 +0000 Received: from [10.60.140.52] (ams-ppsenak-nitro3.cisco.com [10.60.140.52]) by aer-core-4.cisco.com (8.15.2/8.15.2) with ESMTP id 013EiAVp006096; Mon, 3 Feb 2020 14:44:11 GMT To: "Dongjie (Jimmy)" , "Acee Lindem (acee)" , "Ketan Talaulikar (ketant)" , "li_zhenqiang@hotmail.com" , Christian Hopps , lsr Cc: lsr-ads , draft-li-lsr-ospfv3-srv6-extensions References: <795369E8-767A-4642-BA0E-36430F4DBF4E@cisco.com> <5A9AF6BD-A12E-4B6C-A3C5-0D7A9F1ACB3E@cisco.com> <96f6ac1c-a798-6524-5d11-f6879ea8426f@cisco.com> <9b6c9ce47ec14ac7bc07e6c97ab53fb5@huawei.com> <6868a340cbe94576851b8ce0277c3c24@huawei.com> From: Peter Psenak Message-ID: Date: Mon, 3 Feb 2020 15:44:11 +0100 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:60.0) Gecko/20100101 Thunderbird/60.7.0 MIME-Version: 1.0 In-Reply-To: <6868a340cbe94576851b8ce0277c3c24@huawei.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit X-Outbound-SMTP-Client: 10.60.140.52, ams-ppsenak-nitro3.cisco.com X-Outbound-Node: aer-core-4.cisco.com Archived-At: Subject: Re: [Lsr] WG Adoption Call for draft-li-lsr-ospfv3-srv6-extensions X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 03 Feb 2020 14:44:18 -0000 Hi Jie, please see inline (##PP): On 03/02/2020 15:36, Dongjie (Jimmy) wrote: > Hi Peter, > > Thanks for your reply. Please see inline: > >> -----Original Message----- >> From: Peter Psenak [mailto:ppsenak@cisco.com] >> Sent: Monday, February 3, 2020 5:08 PM >> To: Dongjie (Jimmy) ; Acee Lindem (acee) >> ; Ketan Talaulikar (ketant) ; >> li_zhenqiang@hotmail.com; Christian Hopps ; lsr >> >> Cc: lsr-ads ; draft-li-lsr-ospfv3-srv6-extensions >> >> Subject: Re: [Lsr] WG Adoption Call for draft-li-lsr-ospfv3-srv6-extensions >> >> Hi Jie, >> >> please see inline: >> >> >> On 01/02/2020 13:53, Dongjie (Jimmy) wrote: >>> Hi Peter, >>> >>> Please see some comments inline: >>> >>>> -----Original Message----- >>>> From: Lsr [mailto:lsr-bounces@ietf.org] On Behalf Of Peter Psenak >>>> Sent: Friday, January 31, 2020 1:24 AM >>>> To: Acee Lindem (acee) ; Ketan Talaulikar (ketant) >>>> ; li_zhenqiang@hotmail.com; Christian Hopps >>>> ; lsr >>>> Cc: lsr-ads ; draft-li-lsr-ospfv3-srv6-extensions >>>> >>>> Subject: Re: [Lsr] WG Adoption Call for >>>> draft-li-lsr-ospfv3-srv6-extensions >>>> >>>> Hi Acee, >>>> >>>> On 30/01/2020 18:12, Acee Lindem (acee) wrote: >>>>> Hi Peter, >>>>> >>>>> On 1/30/20, 11:36 AM, "Peter Psenak" wrote: >>>>> >>>>> Hi Acee, >>>>> >>>>> On 30/01/2020 17:11, Acee Lindem (acee) wrote: >>>>> > Hi Ketan, >>>>> > >>>>> > In that case, it doesn’t make sense to include it in the End.X >>>>> > advertisement since you need to look it up to check it >>>>> anyway. I >>>> don’t >>>>> > see any benefit here. >>>>> The benefit is to make sure that the END.X SID that was configured >> for >>>>> the algo X is covered by the locator that has the same algo. >>>>> >>>>> If you do not advertise the algo with END.X SID, you have no way >> of >>>>> checking that on rcv side. >>>>> >>>>> Ok - so it is to verify that algorithm for the adjacency matches >>>>> that algorithm >>>> for the longest match locator - which may be advertised by a >>>>> different >>>> OSPFv3 router. Correct? >>>> >>>> yes. >>> >>> In what scenarios will the longest match locator of the END.X SID be >> advertised by a different router? Does this only happen due to bug or >> misconfiguration? >> >> it's not the different OSPFv3 router, it's a different LSA/LSP. > > This sounds more reasonable. But the above case mentioned by Acee is also possible, one example is during locator reconfiguration as you mentioned below. ##PP well, the locator from other node should not be used to resolve the SID. > >>> >>>> >>>> >>>>> I guess I don't see why the algorithm for the END.X SID just isn't >>>>> defined as >>>> the algorithm from the longest match locator. That way, everyone in >>>>> the area would use the same one and there would be less that could >>>> go wrong. What am I missing? >>>> >>>> locators may change over time. During the reconfiguration a END.X SID >>>> may wrongly be associated with the incorrect locator from a different algo. >>> >>> In this case just checking the algorithm may not be enough, if the algorithm >> happens to be the same, will the END.X SID be considered valid and be used by >> transit nodes to route towards the originator of the incorrect locator? Some >> mechanism needs to be considered to avoid using invalid END.X SIDs in such >> case. >> >> if the algo is the same, then the locator is correct. What else do you want to >> check? > > During the reconfiguration of a locator on one node, is it possible that the longest match locator of the END.X SID is from another node? And the algorithm may happen to be the same. In this case it is necessary to add that the END.X SID is considered invalid if its longest match locator is not from the originating router of this SID. After checking the draft I think this is already covered in the last paragraph of section 8, so it should be OK. ##PP right. thanks, Peter > > BTW, I support the adoption of this document. > > Best regards, > Jie > >> >> thanks, >> Peter >> >> >>> >>> Best regards, >>> Jie >>> >>>> Also if for some reason the right locator is not advertised (due to a >>>> bug on the originator), END.X SID traffic may be sent using a wrong >>>> algo. We wanted to avoid it as that can be seen as a security issue. >>>> >>>> thanks, >>>> Peter >>>> >>>> >>>> >>>>> >>>>> Thanks, >>>>> Acee >>>>> >>>>> >>>>> thanks, >>>>> Peter >>>>> >>>>> > >>>>> > Thanks, >>>>> > >>>>> > Acee >>>>> > >>>>> > *From: *"Ketan Talaulikar (ketant)" >>>>> > *Date: *Thursday, January 30, 2020 at 11:06 AM >>>>> > *To: *Acee Lindem , >> "li_zhenqiang@hotmail.com" >>>>> > , Christian Hopps >>>> , lsr >>>>> > >>>>> > *Cc: *draft-li-lsr-ospfv3-srv6-extensions >>>>> > , lsr-ads >>>> >>>>> > *Subject: *RE: [Lsr] WG Adoption Call for >>>>> > draft-li-lsr-ospfv3-srv6-extensions >>>>> > >>>>> > Hi Acee/Zhen, >>>>> > >>>>> > The sec 8 of the draft has the following text which specifies the >>>>> > handling of this condition. >>>>> > >>>>> > All End.X SIDs MUST be subsumed by the subnet of a >> Locator >>>> with the >>>>> > >>>>> > matching algorithm which is advertised by the same node >> in an >>>> SRv6 >>>>> > >>>>> > Locator TLV. End.X SIDs which do not meet this >> requirement >>>> MUST be >>>>> > >>>>> > ignored. >>>>> > >>>>> > Thanks, >>>>> > >>>>> > Ketan >>>>> > >>>>> > *From:* Acee Lindem (acee) >>>>> > *Sent:* 30 January 2020 21:01 >>>>> > *To:* li_zhenqiang@hotmail.com; Ketan Talaulikar (ketant) >>>>> > ; Christian Hopps ; lsr >>>> >>>>> > *Cc:* draft-li-lsr-ospfv3-srv6-extensions >>>>> > ; lsr-ads >>>> >>>>> > *Subject:* Re: [Lsr] WG Adoption Call for >>>>> > draft-li-lsr-ospfv3-srv6-extensions >>>>> > >>>>> > Hi Ketan, Zhen, >>>>> > >>>>> > What happens if there an algorithm conflict between the >>>>> Adjacency >>>> END.X >>>>> > SID and the longest match Locator SID? Either one has to >>>>> take >>>> precedence >>>>> > or this is an error condition. In either case, it needs to >>>>> be >>>> documented. >>>>> > >>>>> > Thanks, >>>>> > >>>>> > Acee >>>>> > >>>>> > *From: *"li_zhenqiang@hotmail.com >>>> " >>>>> > > > >>>>> > *Date: *Thursday, January 30, 2020 at 10:20 AM >>>>> > *To: *"Ketan Talaulikar (ketant)" >>>> > >, Christian Hopps >> >>>> > >, lsr >>> > >>>>> > *Cc: *draft-li-lsr-ospfv3-srv6-extensions >>>>> > >>>> > >, lsr-ads >>>>> > >, Christian Hopps >>>>> > >, Acee >> Lindem >>>>> > > >>>>> > *Subject: *Re: RE: [Lsr] WG Adoption Call for >>>>> > draft-li-lsr-ospfv3-srv6-extensions >>>>> > >>>>> > For the third concern, I think it is better to list the considerations >>>>> > behind the format design of the TLVs to help readers >>>>> understand >>>> them >>>>> > better. For the specification behavior you mention, this doc >> SHOULD >>>>> > specify it explicitly. >>>>> > >>>>> > By the way, what a router should do when it receives END.X SID >>>>> > containing algorithm that is different from the one carried in the >>>>> > convering locator? >>>>> > >>>>> > Best Regards, >>>>> > >>>>> > Zhenqiang Li >>>>> > >>>>> > ------------------------------------------------------------------------ >>>>> > >>>>> > li_zhenqiang@hotmail.com >>>>> > >>>>> > *From:*Ketan Talaulikar (ketant) >> >>>>> > >>>>> > *Date:* 2020-01-30 16:44 >>>>> > >>>>> > *To:*li_zhenqiang@hotmail.com >>>> ; >>>>> > Christian Hopps ; lsr >>>> >>>>> > >>>>> > *CC:*draft-li-lsr-ospfv3-srv6-extensions >>>>> > ; lsr-ads >>>>> > ; Christian Hopps >>>>> > ; Acee Lindem (acee) >>>> >>>>> > >>>>> > *Subject:* RE: RE: [Lsr] WG Adoption Call for >>>>> > draft-li-lsr-ospfv3-srv6-extensions >>>>> > >>>>> > Please check inline again. >>>>> > >>>>> > *From:* li_zhenqiang@hotmail.com >>>> >>>>> > >>> > >>>>> > *Sent:* 30 January 2020 13:46 >>>>> > *To:* Ketan Talaulikar (ketant) >>>> > >; Christian Hopps >>>> >>>> > >; lsr >>> > >>>>> > *Cc:* draft-li-lsr-ospfv3-srv6-extensions >>>>> > >>>> > >; >> lsr-ads >>>>> > >; Christian >> Hopps >>>>> > >; Acee >>>> Lindem (acee) >>>>> > > >>>>> > *Subject:* Re: RE: [Lsr] WG Adoption Call for >>>>> > draft-li-lsr-ospfv3-srv6-extensions >>>>> > >>>>> > Thank you KT for your quick response. Please see my reply >>>> begins >>>>> > with [ZQ]. >>>>> > >>>>> > Best Regards, >>>>> > >>>>> > Zhenqiang Li >>>>> > >>>>> > ------------------------------------------------------------------------ >>>>> > >>>>> > li_zhenqiang@hotmail.com >>>> >>>>> > >>>>> > *From:*Ketan Talaulikar (ketant) >>>> >>>>> > >>>>> > *Date:* 2020-01-30 13:42 >>>>> > >>>>> > *To:*li_zhenqiang@hotmail.com >>>> ; >>>>> > Christian Hopps ; lsr >>>>> > >>>>> > >>>>> > *CC:*draft-li-lsr-ospfv3-srv6-extensions >>>>> > ; >>>> lsr-ads >>>>> > ; Christian Hopps >>>>> > ; Acee Lindem (acee) >>>>> > >>>>> > >>>>> > *Subject:* RE: [Lsr] WG Adoption Call for >>>>> > draft-li-lsr-ospfv3-srv6-extensions >>>>> > >>>>> > Hello Zhenqiang Li, >>>>> > >>>>> > Thanks for your review and comments. Please check >> inline >>>> below. >>>>> > >>>>> > *From:*li_zhenqiang@hotmail.com >>>>> > >>>> >>>> > > >>>>> > *Sent:* 30 January 2020 08:46 >>>>> > *To:* Christian Hopps >>>> > >; lsr >>>> > > >>>>> > *Cc:* draft-li-lsr-ospfv3-srv6-extensions >>>>> > >>>> > >; >>>> lsr-ads >>>>> > >; Christian >>>> Hopps >>>>> > >; >>>> Acee Lindem >>>>> > (acee) > >>>>> > *Subject:* Re: [Lsr] WG Adoption Call for >>>>> > draft-li-lsr-ospfv3-srv6-extensions >>>>> > >>>>> > support the adoption with the following comments. >>>>> > >>>>> > 1. What does SRH stack mean in section 4.2? AS >> specified >>>> in >>>>> > RFC8200 and draft-ietf-6man-segment-routing-header, >>>> only one SRH >>>>> > can be presented in one IPv6 header. >>>>> > >>>>> > */[KT] Thanks for catching this error and will fix as >>>> below:/* >>>>> > >>>>> > *//* >>>>> > >>>>> > */OLD: /*The Maximum End Pop MSD Type specifies >> the >>>> maximum number of SIDs in >>>>> > >>>>> > the top SRH in an SRH stack to which the router >> can >>>> apply >>>>> > Penultimate >>>>> > >>>>> > Segment Pop (PSP) or Ultimate Segment Pop >> (USP) >>>>> > >>>>> > *//* >>>>> > >>>>> > */NEW:/*The Maximum End Pop MSD Type specifies >> the >>>> maximum number of SIDs in >>>>> > >>>>> > the SRH for which the router can apply >> Penultimate >>>>> > >>>>> > Segment Pop (PSP) or Ultimate Segment Pop >> (USP) >>>>> > >>>>> > >>>>> > >>>>> > >>>>> > [ZQ] Fine. >>>>> > >>>>> > 2. The abbreviations used in this draft should be listed >> in a >>>>> > seperated section or point out where they are defined. >>>>> > >>>>> > */[KT] We’ve followed the convention of expanding on >>>> first use >>>>> > as also providing reference where necessary. Please do >> let >>>> know >>>>> > if we’ve missed doing so anywhere./* >>>>> > >>>>> > [ZQ] Some examples: SPF computation in secction 5, >> TBD >>>> in >>>>> > section 2. >>>>> > >>>>> > */[KT] Will expand SPF and some other such on first >> use :-). >>>> The >>>>> > TBD (to be decided) is for use until the code point are >>>>> > allocated by IANA./* >>>>> > >>>>> > 3. Algorithm field is defined for End.x SID to carry the >>>>> > algorithm the end.x sid associates. But no algorithm >> field is >>>>> > defined for End SID in section 7. May I know the >> reason? >>>>> > >>>>> > */[KT] The SRv6 Locator TLV that is the parent of the >> SRv6 >>>> End >>>>> > SID Sub-TLV carries the algorithm and hence there is no >>>> need to >>>>> > repeat in the Sub-TLV. This is not the case for SRv6 >> End.X >>>> SID >>>>> > Sub-TLV and hence it has the algorithm field./* >>>>> > >>>>> > */ >>>>> > >>>>> > >>>>> > /* >>>>> > >>>>> > [ZQ] Make sense but still a little bit weird. Since any SID >>>>> > belongs to a locator, or it is not routable, the algorithm >>>> field >>>>> > in the end.x sid is not needed, end.x sid associates the >>>>> > algorithm carried in the corresponding locator tlv. >>>>> > >>>>> > */[KT] Having an algorithm field advertised with the >> End.X >>>> SID >>>>> > makes it easier for implementation to find the >> algorithm >>>>> > specific End.X SID without making the longest prefix >> match >>>> on >>>>> > all locators advertised by the node to find the >> algorithm to >>>>> > which the SID belongs. It also makes it possible to >> verify >>>> that >>>>> > the algorithm associated with the End.X SID matches >> that >>>> of the >>>>> > covering Locator when the link advertisement with >> End.X >>>> SID is >>>>> > received. /* >>>>> > >>>>> > *//* >>>>> > >>>>> > */Thanks,/* >>>>> > >>>>> > */Ketan/* >>>>> > >>>>> > *//* >>>>> > >>>>> > */Thanks,/* >>>>> > >>>>> > */Ketan/* >>>>> > >>>>> > Best Regards, >>>>> > >>>>> > Zhenqiang Li >>>>> > >>>>> > ------------------------------------------------------------------------ >>>>> > >>>>> > li_zhenqiang@hotmail.com >>>> >>>>> > >>>>> > *From:*Christian Hopps >>>> >>>>> > >>>>> > *Date:* 2020-01-24 04:24 >>>>> > >>>>> > *To:*lsr >>>>> > >>>>> > *CC:*draft-li-lsr-ospfv3-srv6-extensions >>>>> > >> ; >>>>> > lsr-ads ; Christian Hopps >>>>> > ; Acee Lindem >> \(acee\) >>>>> > >>>>> > >>>>> > *Subject:* [Lsr] WG Adoption Call for >>>>> > draft-li-lsr-ospfv3-srv6-extensions >>>>> > >>>>> > Hi LSR WG and Draft Authors, >>>>> > >>>>> > The authors originally requested adoption back @ >>>> 105; >>>>> > however, some comments were received and new >>>> version was >>>>> > produced. Moving forward... >>>>> > >>>>> > This begins a 2 week WG adoption poll for the >>>> following draft: >>>>> > >>>>> > >>>> https://datatracker.ietf.org/doc/draft-li-lsr-ospfv3-srv6-extensions/ >>>>> > >>>>> > Please indicate your support or objection by Feb 6, >>>> 2020. >>>>> > >>>>> > Authors, please respond indicating whether you >> are >>>> aware of >>>>> > any IPR that applies to this draft. >>>>> > >>>>> > Thanks, >>>>> > >>>>> > Chris & Acee. >>>>> > >>>>> > >>>> _______________________________________________ >>>>> > >>>>> > Lsr mailing list >>>>> > >>>>> > Lsr@ietf.org >>>>> > >>>>> > https://www.ietf.org/mailman/listinfo/lsr >>>>> > >>>>> >>>>> >>>>> >>>>> >>>>> >>>> >>>> _______________________________________________ >>>> Lsr mailing list >>>> Lsr@ietf.org >>>> https://www.ietf.org/mailman/listinfo/lsr >>> >>> > > > From nobody Mon Feb 3 18:01:01 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 6EEFE120033; Mon, 3 Feb 2020 18:01:00 -0800 (PST) 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, RCVD_IN_DNSWL_MED=-2.3, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id G94dNiylw_iL; Mon, 3 Feb 2020 18:00:58 -0800 (PST) Received: from huawei.com (lhrrgout.huawei.com [185.176.76.210]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 8C39E12001A; Mon, 3 Feb 2020 18:00:58 -0800 (PST) Received: from lhreml705-cah.china.huawei.com (unknown [172.18.7.106]) by Forcepoint Email with ESMTP id 5F569A4DA9B8502D0BE9; Tue, 4 Feb 2020 02:00:54 +0000 (GMT) Received: from nkgeml702-chm.china.huawei.com (10.98.57.155) by lhreml705-cah.china.huawei.com (10.201.108.46) with Microsoft SMTP Server (TLS) id 14.3.408.0; Tue, 4 Feb 2020 02:00:53 +0000 Received: from nkgeml701-chm.china.huawei.com (10.98.57.156) by nkgeml702-chm.china.huawei.com (10.98.57.155) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.1713.5; Tue, 4 Feb 2020 10:00:51 +0800 Received: from nkgeml701-chm.china.huawei.com ([10.98.57.156]) by nkgeml701-chm.china.huawei.com ([10.98.57.156]) with mapi id 15.01.1713.004; Tue, 4 Feb 2020 10:00:51 +0800 From: "Dongjie (Jimmy)" To: Christian Hopps , "lsr@ietf.org" CC: "lsr-ads@ietf.org" , "Acee Lindem (acee)" Thread-Topic: [Lsr] WG Last Call draft-ietf-lsr-isis-srv6-extensions Thread-Index: AQHV0LkKMx96+z6oU0axhhksMWqCPagKXERw Date: Tue, 4 Feb 2020 02:00:51 +0000 Message-ID: <01e4325ba5994cf5939ff33cedc5472c@huawei.com> References: <122B138F-AA4F-4C7C-969C-755DF15F5744@chopps.org> In-Reply-To: <122B138F-AA4F-4C7C-969C-755DF15F5744@chopps.org> Accept-Language: en-US, zh-CN Content-Language: zh-CN X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.45.181.148] Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-CFilter-Loop: Reflected Archived-At: Subject: Re: [Lsr] WG Last Call draft-ietf-lsr-isis-srv6-extensions X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 04 Feb 2020 02:01:01 -0000 I support progressing this draft. Best regards, Jie > -----Original Message----- > From: Lsr [mailto:lsr-bounces@ietf.org] On Behalf Of Christian Hopps > Sent: Wednesday, January 22, 2020 8:15 AM > To: lsr@ietf.org > Cc: lsr-ads@ietf.org; Christian Hopps ; Acee Lindem > (acee) > Subject: [Lsr] WG Last Call draft-ietf-lsr-isis-srv6-extensions >=20 > This begins a 2 week WG Last Call, ending after Feb 4, 2020, for > draft-ietf-lsr-isis-srv6-extensions >=20 > https://datatracker.ietf.org/doc/draft-ietf-lsr-isis-srv6-extensions/ >=20 > Authors please indicate if you aware of any other IPR beyond what is post= ed: >=20 > https://datatracker.ietf.org/ipr/3796/ >=20 > Thanks, > Chris & Acee. > _______________________________________________ > Lsr mailing list > Lsr@ietf.org > https://www.ietf.org/mailman/listinfo/lsr From nobody Tue Feb 4 00:44:26 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 0D98B120123; Tue, 4 Feb 2020 00:44:24 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -14.502 X-Spam-Level: X-Spam-Status: No, score=-14.502 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, RCVD_IN_DNSWL_HI=-5, 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 dR2frSYvYC7K; Tue, 4 Feb 2020 00:44:22 -0800 (PST) Received: from aer-iport-3.cisco.com (aer-iport-3.cisco.com [173.38.203.53]) (using TLSv1.2 with cipher DHE-RSA-SEED-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 460B0120074; Tue, 4 Feb 2020 00:44:22 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=669; q=dns/txt; s=iport; t=1580805862; x=1582015462; h=subject:from:to:cc:references:message-id:date: mime-version:in-reply-to:content-transfer-encoding; bh=JYlMZpK2jDTEkhUoe33PGJPRcJNlmSau0imjj80GXjc=; b=ORSIJoao9lKc8W7ucllW2kXB+QcSlUw89riCOlfQOD2tdIG9dEfZtmbx pEQuyoCy66S7ynsp8qPGpWmuhP0KSwdzeM4pFD4zF465fXAAUr5K/3rEE ofgMkJWYHnUr413AkgRpgAl//xJhAp/xRajnnJgxS8NSPrTlR/e21YP+T 8=; X-IronPort-AV: E=Sophos;i="5.70,398,1574121600"; d="scan'208";a="20620427" Received: from aer-iport-nat.cisco.com (HELO aer-core-2.cisco.com) ([173.38.203.22]) by aer-iport-3.cisco.com with ESMTP/TLS/DHE-RSA-SEED-SHA; 04 Feb 2020 08:44:19 +0000 Received: from [10.60.140.52] (ams-ppsenak-nitro3.cisco.com [10.60.140.52]) by aer-core-2.cisco.com (8.15.2/8.15.2) with ESMTP id 0148iJ3x027454; Tue, 4 Feb 2020 08:44:19 GMT From: Peter Psenak To: Chris Bowers , "Les Ginsberg (ginsberg)" Cc: lsr@ietf.org, lsr-ads@ietf.org, Christian Hopps , "Acee Lindem (acee)" References: <122B138F-AA4F-4C7C-969C-755DF15F5744@chopps.org> <86b274ad-e26b-029b-a36f-01febc03027a@cisco.com> Message-ID: <82905f7c-cf95-322d-55ba-c3cfe497e0eb@cisco.com> Date: Tue, 4 Feb 2020 09:44:19 +0100 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:60.0) Gecko/20100101 Thunderbird/60.7.0 MIME-Version: 1.0 In-Reply-To: <86b274ad-e26b-029b-a36f-01febc03027a@cisco.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit X-Outbound-SMTP-Client: 10.60.140.52, ams-ppsenak-nitro3.cisco.com X-Outbound-Node: aer-core-2.cisco.com Archived-At: Subject: Re: [Lsr] WG Last Call draft-ietf-lsr-isis-srv6-extensions X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 04 Feb 2020 08:44:24 -0000 Hi Chris, On 03/02/2020 14:39, Peter Psenak wrote: >> I think a reasonable solution would be to remove the restriction >> >> on the N-flag to allow it to be used for non-/128 prefixes/locators.  This >> >> would allow the three possible prefix-SIDs states to be easily represented. > ##PP > right, that could be a possibility, which would allow SRv6 locator to > have the "node" property, as locators are never /128. do you have a use case, where the locator would need a N-flag? I can not really think of any, so unless we have one, we better not define an N-flag for a non-/128 locator prefix. thanks, Peter > > thanks, > Peter > > From nobody Tue Feb 4 14:19:34 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 5F2F41200B7; Tue, 4 Feb 2020 14:19:33 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.997 X-Spam-Level: X-Spam-Status: No, score=-1.997 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_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id siDCfDVA80V8; Tue, 4 Feb 2020 14:19:30 -0800 (PST) Received: from mail-qt1-x82e.google.com (mail-qt1-x82e.google.com [IPv6:2607:f8b0:4864:20::82e]) (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 B412312003F; Tue, 4 Feb 2020 14:19:29 -0800 (PST) Received: by mail-qt1-x82e.google.com with SMTP id w47so15678951qtk.4; Tue, 04 Feb 2020 14:19:29 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=rVQdl2f1CuuySR28JGkhUN0tV1ypYIngV4T0wZ1Eoek=; b=KGmaxu+KGLsimv2Yu/GOIgERqQ1fKYhATadjcczHPj3+k5wR7p09qMP8tUpXkYMobp X0vJywhXCUv43214qgoqmfK0LMxHh9E+PRQCT3UYZpXZWodvzdw31CWEqXrFqomcm/Lx cu5e4R+kEexvrUhLekiojSYiCZ771q4ux7IF9CvKrUKPolKwJAO9UQ1p9p5LGH7og3tK 7tKyi9+VP3xssKxOuETEvQcwWlzgsQwpvfUxv2+mqqITnqWvCk/VtuMVxiriy/rG5J8m LBodCjE3OfO7FB8Wp6ABogZX30F4B3rAhs9o+gCyat75br/lSFvoXETXw7nC6lfswNHx hJcA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=rVQdl2f1CuuySR28JGkhUN0tV1ypYIngV4T0wZ1Eoek=; b=peNjb3ESKKDZuR1HMr5n6k4GivxyYRXHSfz6hK9K+RTT6lkIomaObsGqKfGoYHbheF s/n0ATE6azJ4q4ZHGFB8B79O783gNWI+fB6X6nrGP05nk05pW3yRvjiCQzSoTJGcnZDD d91/PfqGM+Zk+dGh4P0As4rM2PYQp9BKEhhpN2rfCzmJvM93jS1WAVobiU+ufvKTPJ4U PfO5gNs7MkBqlHJN487tXV9DzLOJVxxkUiyhs/TUbDKjp9JnpFMy4tXjPWoT7alm8NIY gZMLES5PK/Ee4VR1HNtO+ReuXiM3NGFaoY8G018H6wn0HKs7mHZBzNHjoImkeS848MBH 7twg== X-Gm-Message-State: APjAAAVSposmjJ6e+fI9AdNc1PcqmJTsOpZnHZ5g6ysUvmTFb/2tOl2t mqeC8nPzWXpJFC67qaKLVbqrO3xri2n4pUmU1ZA= X-Google-Smtp-Source: APXvYqxNYqc4Zqli2YGWF1qJlqxJRjf3TD8vdfqz9PgvpmTEsNdd9IOtzTEJu9KTHhAS9SI7fs0V9gcCD7BptXUrsP0= X-Received: by 2002:ac8:4616:: with SMTP id p22mr31108229qtn.368.1580854768682; Tue, 04 Feb 2020 14:19:28 -0800 (PST) MIME-Version: 1.0 References: <122B138F-AA4F-4C7C-969C-755DF15F5744@chopps.org> <86b274ad-e26b-029b-a36f-01febc03027a@cisco.com> In-Reply-To: <86b274ad-e26b-029b-a36f-01febc03027a@cisco.com> From: Chris Bowers Date: Tue, 4 Feb 2020 16:17:07 -0600 Message-ID: To: Peter Psenak Cc: "Les Ginsberg (ginsberg)" , lsr@ietf.org, lsr-ads@ietf.org, Christian Hopps , "Acee Lindem (acee)" Content-Type: multipart/alternative; boundary="000000000000edcaa4059dc76e72" Archived-At: Subject: Re: [Lsr] WG Last Call draft-ietf-lsr-isis-srv6-extensions X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 04 Feb 2020 22:19:33 -0000 --000000000000edcaa4059dc76e72 Content-Type: text/plain; charset="UTF-8" Peter, Suppose I receive a locator advertisement from router R7 with locator = 7777::/64 and End-SID 7777::1. I would like to be able to use End-SID 7777::1 as a Node-SID when constructing traffic engineered paths. That is, I want to know that the person or system that configured R7 believes that 7777::/64 is NOT owned by more than one router within the same routing domain. Since we are going with Interpretation I) below, a prefix can be (a) a Node Prefix, (b) an Anycast Prefix, or (c) neither of them. If I receive an RFC7794 advertisement from R7 for 7777::/64 with N=0, A=0, I can only conclude that 7777::/64 is either (a) a Node Prefix or (c) neither a Node Prefix nor an Anycast Prefix. Using the N-flag for a non-/128 would allow us to unambiguously indicate that 7777::/64 is a Node Prefix, so we can use the associated End-SID 7777::1 in a manner consistent with the knowledge that 7777::/64 is NOT owned by more than one router within the same routing domain. One other small point relates to the statement below that "locators are never /128". I don't think it would be very useful to configure a /128 locator, since it only has space for one SRv6 SID. However, the current text of draft-ietf-lsr-isis-srv6-extensions explicitly allows the Loc-Size to be 1-128. Thanks, Chris On Tue, Feb 4, 2020 at 2:44 AM Peter Psenak wrote: > Hi Chris, > > On 03/02/2020 14:39, Peter Psenak wrote: > >> I think a reasonable solution would be to remove the restriction > >> > >> on the N-flag to allow it to be used for non-/128 prefixes/locators. > This > >> > >> would allow the three possible prefix-SIDs states to be easily > represented. > > ##PP > > right, that could be a possibility, which would allow SRv6 locator to > > have the "node" property, as locators are never /128. > > do you have a use case, where the locator would need a N-flag? > > I can not really think of any, so unless we have one, we better not > define an N-flag for a non-/128 locator prefix. > > thanks, > Peter > On Mon, Feb 3, 2020 at 7:39 AM Peter Psenak wrote: > Hi Chris, > > adding to what Les has said. > Please see inline (##PP) > > On 31/01/2020 21:10, Chris Bowers wrote: > > Peter and Les, > > > > It seems to me that for the Node Flag in RFC7794 and the proposed > > Anycast Flag > > > > in draft-ietf-lsr-isis-srv6-extensions-04, we are ultimately concerned > with > > > > how to identify IGP-Node Segments and IGP-Anycast Segments, as defined > > in RFC8402, > > > > the Segment Routing Architecture document. > > > > If this is the case, then the following text from RFC8402 is very > relevant. > > > > ============ > > > > 3.2. IGP-Node Segment (Node-SID) > > > > An IGP Node-SID MUST NOT be associated with a prefix that is owned by > > > > more than one router within the same routing domain. > > > > 3.3. IGP-Anycast Segment (Anycast-SID) > > > > .... > > > > An IGP-Anycast segment MUST NOT reference a particular node. > > > > ..... > > > > ============ > > > > This text can be interpreted in two different ways. > > > > Interpretation I) > > > > A prefix-SID can have the following three possible states. > > > > Ia) Node-SID > > > > Ib) Anycast-SID > > > > Ic) neither Node-SID nor Anycast-SID > > ##PP > Prefix can either be Node Prefix, Anycast Prefix or neither of them. > > > > > > Interpretation II) > > > > A prefix-SID can have the following two possible states. > > > > IIa) Node-SID > > > > IIb) Anycast-SID > > > > If Interpretation I) is correct, then I think that the current encodings > in > > > > draft-ietf-lsr-isis-srv6-extensions-04 do not allow us > > > > to unambiguously identify a Node-SID for a non-/128 > > > > prefix/locator. For example, the End-SIDs within a /64 locator with the > > A-flag set could > > > > either be Ia) a Node-SID > > ##PP > rfc7794 does not allow the N-flag to be set for non-/128 prefix, so > above is not possible for /64 locator at the moment. > > If the A-flag is set, it is an anycast locator. > > > > >or Ic) neither Node-SID nor Anycast-SID. > > ##PP > if the A-flag was not set for /64 locator, above would be correct, but > given that the A-flag is set, it is clearly just Anycast locator. > > > > > I think a reasonable solution would be to remove the restriction > > > > on the N-flag to allow it to be used for non-/128 prefixes/locators. > This > > > > would allow the three possible prefix-SIDs states to be easily > represented. > > ##PP > right, that could be a possibility, which would allow SRv6 locator to > have the "node" property, as locators are never /128. > > thanks, > Peter > > > > > > If Interpretation II) is correct, then I think that the current > > encodings in > > > > draft-ietf-lsr-isis-srv6-extensions-04 need clarification with respect to > > > > how to interpret a /128 prefix/locator advertisement with N=0, A=0. We > > > > have to decide between interpreting the End-SIDs within the locator > > > > as either Node-SIDs or Anycast-SIDs, since there is no third option. > > > > I think that interpreting the End-SIDs as Anycast-SIDs in the N=0, A=0 > > > > case is preferable because it preserves backwards compatibility. > > > > > > Thanks, > > > > Chris > > > > > > > > On Thu, Jan 30, 2020 at 4:02 AM Peter Psenak > > wrote: > > > > Hi Chris, > > > > please see inline (##PP) > > > > On 29/01/2020 17:25, Chris Bowers wrote: > > > I would like to proposed the following text to make section 6 > > more clear. > > > > > > Thanks, > > > Chris > > > > > > ==================== > > > > > > (existing text) > > > > > > > > > 6. Advertising Anycast Property > > > > > > Both prefixes and SRv6 Locators may be configured as anycast > > and as > > > > > > such the same value can be advertised by multiple routers. > It is > > > > > > useful for other routers to know that the advertisement is > for an > > > > > > anycast identifier. > > > > > > A new flag in "Bit Values for Prefix Attribute Flags Sub-TLV" > > > > > > registry [RFC7794] is defined to advertise the anycast > property: > > > > > > Bit #: 4 (Suggested - to be assigned by IANA) > > > > > > Name: Anycast Flag (A-flag) > > > > > > When the prefix/SRv6 locator is configured as anycast, > > the A-flag > > > > > > SHOULD be set. Otherwise, this flag MUST be clear. > > > > > > The A-flag MUST be preserved when leaked between levels. > > > > > > The A-flag and the N-flag MUST NOT both be set. > > > > > > ==== start insert new text ======= > > > > > > > > > Certain use cases require prefixes/locators that uniquely belong > > to a node. > > > > > > Since prefixes/locators which are not /128 should not have the N > > bit set, > > > > > > this node local uniqueness is decided based on A bit for non-/128 > > prefixes. > > > > ##PP > > above does not seem correct. Above seems to imply that for non-/128 > > prefix, A-bit is replacement of N-bit. > > > > A-bit applies to both /128 and non-/128 prefixes equally. > > > > Current draft clearly states what to do when both N a A bits are set. > > > > > > > > > > > > When a prefix/locator iscategorized as anycast, it does not > > uniquely > > > belong > > > > > > to a node and cannot be used for such use cases. The rules > > below > > > specify > > > > > > how to determine whether or not a prefix/locator should be > > treated > > > as anycast > > > > > > in various situations. > > > > > > > > > [RFC7794] contains the following restriction on the > > interpretation of the N-flag. > > > > > > "If the flag is set and the prefix length is NOT a host prefix > > > > > > (/32 for IPV4, /128 forIPv6), then the flag MUST be ignored." > > > > > > The current document does NOT modify this restriction on the > > interpretation of > > > > > > the N-flag imposed by [RFC7794]. > > > > ##PP > > I don't think above text is needed. And I don't think above is > > completely correct, as we define a new case in which the N-bit > > should be > > ignored (when A-bit is set). > > > > > > > > > > For a prefix/SRv6 Locator advertisement with a /128 > > prefix/locator, > > > > > > if both N-flag and A-flag are set, the receiving router MUST > > treat the > > > > > > prefix advertisement as anycast. > > > > ##PP > > we have following text in the draft already: > > > > "If both N-flag and A-flag are set in the prefix/SRv6 Locator > > advertisement, the receiving routers MUST ignore the N-flag." > > > > > > > > > > > > For a prefix/SRv6 Locator advertisement with a /128 > > prefix/locator, > > > > > > if the N-flag and A-flag are NOT set, the receiving routers > > > > > > MUST treat the prefix advertisement as anycast.. > > > > ##PP > > I don't think above statement is correct. Why a node cannot > advertise a > > /128 prefix which is not an anycast one and does not have a N-bit > set? > > > > > > > > > This rule ensures the > > > > > > correct interpretation of a prefix advertisement originated by > > > > > > a router that is not SRv6 capable and originates a legacy > > > > > > Prefix Attribute Flags Sub-TLV based on [RFC7794] alone. > > > > > > For a prefix/SRv6 Locator advertisement with a prefix/locator > > that > > > > > > is NOT /128, the N-flag must be ignored, so the setting of the > > > > > > A-flag determines the anycast treatment of the prefix > > advertisement. > > > > ##PP > > A-flag does that regardless of the length of the prefix. > > > > > > > > > > The Prefix Attribute Flags Sub-TLV can be carried in the SRv6 > > > Locator TLV > > > > > > as well as the Prefix Reachability TLVs. When a router > > originates > > > > > > both the Prefix Reachability TLV and the SRv6 Locator TLV for > > a given > > > > > > prefix, and the router is originating the Prefix Attribute > > Flags Sub-TLV > > > > > > in one of the TLVs, the router SHOULD advertise identical > > versions of the > > > > > > Prefix Attribute Flags Sub-TLV in both TLVs. > > > > ##PP > > Above seems a good suggestion. Will add it. > > > > > > > > > > > > > > If a router receives one Prefix Attribute Flags Sub-TLV in the > > > > > > Prefix Reachability TLV and another in the SRv6 Locator TLV, > > the router should > > > > > > use the prefix attribute flags received in the Prefix > > Reachability TLV. > > > > ##PP > > above contradicts what you suggest in the previous paragraph, where > you > > suggest we need to advertise with both prefix and locator, and here > you > > suggest we ignore what we received in the locator. > > > > Are you talking about the case where the content of the Prefix > > Attribute > > Flags Sub-TLV is different in prefix vs locator? > > > > > > > > > > > > If a router receives a Prefix Attribute Flags Sub-TLV in the > > > > > > Prefix Reachability TLV but not in the SRv6 Locator TLV, the > > router should > > > > > > use the prefix attribute flags received in the Prefix > > Reachability TLV. > > > > ##PP > > do we really need this? If the originator does the right thing, then > we > > don't have the problem. Cross referencing data between different TLVs > > complicates the implementations. > > > > > > > > > > > > > > > > If a router receives a Prefix Attribute Flags Sub-TLV in the > > > > > > SRv6 Locator TLV but not in the Prefix Reachability TLV, > > > > > > the router should use the prefix attribute flags received in > > the SRv6 Locator TLV. > > > > ##PP > > same as above. > > > > thanks, > > Peter > > > > > > > > ==== end insert new text ========= > > > > > > The same prefix/SRv6 Locator can be advertised by multiple > > routers. > > > > > > If at least one of them sets the A-Flag in its advertisement, > the > > > > > > prefix/SRv6 Locator SHOULD be considered as anycast.. > > > > > > > > > > > > =================== > > > > > > > > > On Tue, Jan 21, 2020 at 6:15 PM Christian Hopps > > > > > >> wrote: > > > > > > This begins a 2 week WG Last Call, ending after Feb 4, 2020, > for > > > draft-ietf-lsr-isis-srv6-extensions > > > > > > > > https://datatracker.ietf. > .org/doc/draft-ietf-lsr-isis-srv6-extensions/ > > > > > < > https://datatracker.ietf.org/doc/draft-ietf-lsr-isis-srv6-extensions/> > > > > > > Authors please indicate if you aware of any other IPR beyond > > what is > > > posted: > > > > > > https://datatracker.ietf.org/ipr/3796/ > > > > > > Thanks, > > > Chris & Acee. > > > _______________________________________________ > > > Lsr mailing list > > > Lsr@ietf.org > > > > > https://www.ietf.org/mailman/listinfo/lsr > > > > > > > --000000000000edcaa4059dc76e72 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Peter,

Suppose I receive a locator advertise= ment from router R7 with
locator =3D 7777::/64 and End-SID=20 7777::1.=C2=A0 I would like to be able to use=20 End-SID=20 7777::1 as
a Node-SID when constructing traffic engineered p= aths.=C2=A0 That is, I want to know that
the person or syste= m that configured R7 believes that=20 7777::/64
is NOT owned by more than one router within the sa= me routing domain.
=C2=A0
Since we are going with Interpretation I) below, a prefix can be (a) a= Node Prefix, (b) an Anycast Prefix,
or (c) neither of them.= =C2=A0 If I receive an RFC7794 advertisement from R7 for 7777::/64 with N= =3D0, A=3D0,
I can only conclude that 7777::/64 is either (a) a N= ode Prefix or (c) neither a Node Prefix nor an
Anycast Prefi= x. Using the N-flag for a non-/128 would allow us to=C2=A0 unambiguously indicate that
7777::/64 is a Node Prefix, so we can use the associated End-SID=20 7777::1 in a manner
consistent with the knowledge that 7777::/64 = is NOT owned by more than one router
within the same routing= domain.

One other small point relates to the s= tatement below that "locators are never /128".=C2=A0
I don't think it would be very useful to configure a /128 locator, s= ince it only has
space for one SRv6 SID.=C2=A0=C2=A0 However, the= current text of draft-ietf-lsr-isis-srv6-extensions explicitly
= allows the Loc-Size to be 1-128.

Thanks,
Chris

On Tue, Feb 4, 2020 at 2:44 AM Peter Psenak= <ppsenak@cisco.com> wrote:<= br>
Hi Chris,

On 03/02/2020 14:39, Peter Psenak wrote:
>> I think a reasonable solution would be to remove the restriction >>
>> on the N-flag to allow it to be used for non-/128 prefixes/locator= s.=C2=A0 This
>>
>> would allow the three possible prefix-SIDs states to be easily rep= resented.
> ##PP
> right, that could be a possibility, which would allow SRv6 locator to<= br> > have the "node" property, as locators are never /128.

do you have a use case, where the locator would need a N-flag?

I can not really think of any, so unless we have one, we better not
define an N-flag for a non-/128 locator prefix.

thanks,
Peter
On Mon, Fe= b 3, 2020 at 7:39 AM Peter Psenak <= ppsenak@cisco.com> wrote:
Hi Chris,

adding to what Les has said.
Please see inline (##PP)

On 31/01/2020 21:10, Chris Bowers wrote:
> Peter and Les,
>
> It seems to me that for the Node Flag in RFC7794 and the proposed
> Anycast Flag
>
> in draft-ietf-lsr-isis-srv6-extensions-04, we are ultimately concerned= with
>
> how to identify IGP-Node Segments and IGP-Anycast Segments, as defined=
> in RFC8402,
>
> the Segment Routing Architecture document.
>
> If this is the case, then the following text from RFC8402 is very rele= vant.
>
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
>
> 3.2.=C2=A0 IGP-Node Segment (Node-SID)
>
>=C2=A0 =C2=A0=C2=A0 An IGP Node-SID MUST NOT be associated with a prefi= x that is owned by
>
>=C2=A0 =C2=A0=C2=A0 more than one router within the same routing domain= .
>
> 3.3.=C2=A0 IGP-Anycast Segment (Anycast-SID)
>
>=C2=A0 =C2=A0=C2=A0 ....
>
>=C2=A0 =C2=A0=C2=A0 An IGP-Anycast segment MUST NOT reference a particu= lar node.
>
>=C2=A0 =C2=A0=C2=A0 .....
>
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
>
> This text can be interpreted in two different ways.
>
> Interpretation I)
>
> A prefix-SID can have the following three possible states.
>
> Ia) Node-SID
>
> Ib) Anycast-SID
>
> Ic) neither Node-SID nor Anycast-SID

##PP
Prefix can either be Node Prefix, Anycast Prefix or neither of them.


>
> Interpretation II)
>
> A prefix-SID can have the following two possible states.
>
> IIa) Node-SID
>
> IIb) Anycast-SID
>
> If Interpretation I) is correct, then I think that the current encodin= gs in
>
> draft-ietf-lsr-isis-srv6-extensions-04 do not allow us
>
> to unambiguously identify a Node-SID for a non-/128
>
> prefix/locator.=C2=A0 For example, the End-SIDs within a /64 locator w= ith the
> A-flag set could
>
> either be Ia) a Node-SID=C2=A0 =C2=A0 =C2=A0

##PP
rfc7794 does not allow the N-flag to be set for non-/128 prefix, so
above is not possible for /64 locator at the moment.

If the A-flag is set, it is an anycast locator.



>or Ic) neither Node-SID nor Anycast-SID.

##PP
if the A-flag was not set for /64 locator, above would be correct, but
given that the A-flag is set, it is clearly just Anycast locator.

>
> I think a reasonable solution would be to remove the restriction
>
> on the N-flag to allow it to be used for non-/128 prefixes/locators.= =C2=A0 This
>
> would allow the three possible prefix-SIDs states to be easily represe= nted.

##PP
right, that could be a possibility, which would allow SRv6 locator to
have the "node" property, as locators are never /128.

thanks,
Peter


>
> If Interpretation II) is correct, then I think that the current
> encodings in
>
> draft-ietf-lsr-isis-srv6-extensions-04 need clarification with respect= to
>
> how to interpret a /128 prefix/locator advertisement with N=3D0, A=3D0= . We
>
> have to decide between interpreting the End-SIDs within the locator >
> as either Node-SIDs or Anycast-SIDs, since there is no third option. >
> I think that interpreting the End-SIDs as Anycast-SIDs in the N=3D0, A= =3D0
>
> case is preferable because it preserves backwards compatibility.
>
>
> Thanks,
>
> Chris
>
>
>
> On Thu, Jan 30, 2020 at 4:02 AM Peter Psenak <ppsenak@cisco.com
> <mailto:ppse= nak@cisco.com>> wrote:
>
>=C2=A0 =C2=A0 =C2=A0Hi Chris,
>
>=C2=A0 =C2=A0 =C2=A0please see inline (##PP)
>
>=C2=A0 =C2=A0 =C2=A0On 29/01/2020 17:25, Chris Bowers wrote:
>=C2=A0 =C2=A0 =C2=A0 > I would like to proposed the following text t= o make section 6
>=C2=A0 =C2=A0 =C2=A0more clear.
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 > Thanks,
>=C2=A0 =C2=A0 =C2=A0 > Chris
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 > =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0(existing text)
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 > 6.=C2=A0 Advertising Anycast Property
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=C2=A0 Both prefixes and SRv6 Loc= ators may be configured as anycast
>=C2=A0 =C2=A0 =C2=A0and as
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=C2=A0 such the same value can be= advertised by multiple routers.=C2=A0 It is
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=C2=A0 useful for other routers t= o know that the advertisement is for an
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=C2=A0 anycast identifier.
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=C2=A0 A new flag in "Bit Va= lues for Prefix Attribute Flags Sub-TLV"
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=C2=A0 registry [RFC7794] is defi= ned to advertise the anycast property:
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Bi= t #: 4 (Suggested - to be assigned by IANA)
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Na= me: Anycast Flag (A-flag)
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Wh= en the prefix/SRv6 locator is configured as anycast,
>=C2=A0 =C2=A0 =C2=A0the A-flag
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 SH= OULD be set. Otherwise, this flag MUST be clear.
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=C2=A0 The A-flag MUST be preserv= ed when leaked between levels.
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=C2=A0 The A-flag and the N-flag = MUST NOT both be set.
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 > =3D=3D=3D=3D start insert new text =3D=3D=3D= =3D=3D=3D=3D
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 > Certain use cases require prefixes/locators t= hat uniquely belong
>=C2=A0 =C2=A0 =C2=A0to a node.
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 > Since prefixes/locators which are not /128 sh= ould not have the N
>=C2=A0 =C2=A0 =C2=A0bit set,
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 > this node local uniqueness is decided based o= n A bit for non-/128
>=C2=A0 =C2=A0 =C2=A0prefixes.
>
>=C2=A0 =C2=A0 =C2=A0##PP
>=C2=A0 =C2=A0 =C2=A0above does not seem correct. Above seems to imply t= hat for non-/128
>=C2=A0 =C2=A0 =C2=A0prefix, A-bit is replacement of N-bit.
>
>=C2=A0 =C2=A0 =C2=A0A-bit applies to both /128 and non-/128 prefixes eq= ually.
>
>=C2=A0 =C2=A0 =C2=A0Current draft clearly states what to do when both N= a A bits are set.
>
>
>
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=C2=A0 When a prefix/locator isca= tegorized as anycast, it does not
>=C2=A0 =C2=A0 =C2=A0uniquely
>=C2=A0 =C2=A0 =C2=A0 > belong
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=C2=A0 to a node and cannot be us= ed for such use cases.=C2=A0 The rules
>=C2=A0 =C2=A0 =C2=A0below
>=C2=A0 =C2=A0 =C2=A0 > specify
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=C2=A0 how to determine whether o= r not a prefix/locator should be
>=C2=A0 =C2=A0 =C2=A0treated
>=C2=A0 =C2=A0 =C2=A0 > as anycast
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=C2=A0 in various situations.
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=C2=A0 [RFC7794] contains the fol= lowing restriction on the
>=C2=A0 =C2=A0 =C2=A0interpretation of the N-flag.
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0"If the flag is set a= nd the prefix length is NOT a host prefix
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=C2=A0=C2=A0=C2=A0(/32 for IPV4, = /128 forIPv6), then the flag MUST be ignored."
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=C2=A0 The current document does = NOT modify this restriction on the
>=C2=A0 =C2=A0 =C2=A0interpretation of
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=C2=A0=C2=A0the N-flag imposed by= [RFC7794].
>
>=C2=A0 =C2=A0 =C2=A0##PP
>=C2=A0 =C2=A0 =C2=A0I don't think above text is needed. And I don&#= 39;t think above is
>=C2=A0 =C2=A0 =C2=A0completely correct, as we define a new case in whic= h the N-bit
>=C2=A0 =C2=A0 =C2=A0should be
>=C2=A0 =C2=A0 =C2=A0ignored (when A-bit is set).
>
>
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=C2=A0=C2=A0For a prefix/SRv6 Loc= ator advertisement with a /128
>=C2=A0 =C2=A0 =C2=A0prefix/locator,
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=C2=A0 if both N-flag and A-flag = are set, the receiving router MUST
>=C2=A0 =C2=A0 =C2=A0treat the
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=C2=A0=C2=A0prefix advertisement = as anycast.
>
>=C2=A0 =C2=A0 =C2=A0##PP
>=C2=A0 =C2=A0 =C2=A0we have following text in the draft already:
>
>=C2=A0 =C2=A0 =C2=A0"If both N-flag and A-flag are set in the pref= ix/SRv6 Locator
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 advertisement, the receiving routers= MUST ignore the N-flag."
>
>
>
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=C2=A0 For a prefix/SRv6 Locator = advertisement with a /128
>=C2=A0 =C2=A0 =C2=A0prefix/locator,
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=C2=A0 if the N-flag and A-flag a= re NOT set, the receiving routers
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=C2=A0=C2=A0MUST treat the prefix= advertisement as anycast..
>
>=C2=A0 =C2=A0 =C2=A0##PP
>=C2=A0 =C2=A0 =C2=A0I don't think above statement is correct. Why a= node cannot advertise a
>=C2=A0 =C2=A0 =C2=A0/128 prefix which is not an anycast one and does no= t have a N-bit set?
>
>
>
>=C2=A0 =C2=A0 =C2=A0 > This rule ensures the
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=C2=A0=C2=A0correct interpretatio= n of a prefix advertisement originated by
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=C2=A0=C2=A0a router that is not = SRv6 capable and originates a legacy
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=C2=A0=C2=A0Prefix Attribute Flag= s Sub-TLV based on [RFC7794] alone.
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=C2=A0 For a prefix/SRv6 Locator = advertisement with a prefix/locator
>=C2=A0 =C2=A0 =C2=A0that
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=C2=A0 is NOT /128, the N-flag mu= st be ignored, so the setting of the
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=C2=A0=C2=A0A-flag determines the= anycast treatment of the prefix
>=C2=A0 =C2=A0 =C2=A0advertisement.
>
>=C2=A0 =C2=A0 =C2=A0##PP
>=C2=A0 =C2=A0 =C2=A0A-flag does that regardless of the length of the pr= efix.
>
>
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=C2=A0=C2=A0The Prefix Attribute = Flags Sub-TLV can be carried in the SRv6
>=C2=A0 =C2=A0 =C2=A0 > Locator TLV
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0as well as the Prefix Reac= hability TLVs.=C2=A0 When a router
>=C2=A0 =C2=A0 =C2=A0originates
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=C2=A0=C2=A0both the Prefix Reach= ability TLV and the SRv6 Locator TLV for
>=C2=A0 =C2=A0 =C2=A0a given
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=C2=A0=C2=A0prefix, and the route= r is originating the Prefix Attribute
>=C2=A0 =C2=A0 =C2=A0Flags Sub-TLV
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=C2=A0 in one of the TLVs, the ro= uter SHOULD advertise identical
>=C2=A0 =C2=A0 =C2=A0versions of the
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=C2=A0=C2=A0Prefix Attribute Flag= s Sub-TLV in both TLVs.
>
>=C2=A0 =C2=A0 =C2=A0##PP
>=C2=A0 =C2=A0 =C2=A0Above seems a good suggestion. Will add it.
>
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=C2=A0 If a router receives one P= refix Attribute Flags Sub-TLV in the
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=C2=A0=C2=A0Prefix Reachability T= LV and another in the SRv6 Locator TLV,
>=C2=A0 =C2=A0 =C2=A0the router should
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=C2=A0=C2=A0use the prefix attrib= ute flags received in the Prefix
>=C2=A0 =C2=A0 =C2=A0Reachability TLV.
>
>=C2=A0 =C2=A0 =C2=A0##PP
>=C2=A0 =C2=A0 =C2=A0above contradicts what you suggest in the previous = paragraph, where you
>=C2=A0 =C2=A0 =C2=A0suggest we need to advertise with both prefix and l= ocator, and here you
>=C2=A0 =C2=A0 =C2=A0suggest we ignore what we received in the locator.<= br> >
>=C2=A0 =C2=A0 =C2=A0Are you talking about the case where the content of= the Prefix
>=C2=A0 =C2=A0 =C2=A0Attribute
>=C2=A0 =C2=A0 =C2=A0Flags Sub-TLV is different in prefix vs locator? >=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=C2=A0 If a router receives a Pre= fix Attribute Flags Sub-TLV in the
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=C2=A0=C2=A0Prefix Reachability T= LV but not in the SRv6 Locator TLV, the
>=C2=A0 =C2=A0 =C2=A0router should
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=C2=A0=C2=A0use the prefix attrib= ute flags received in the Prefix
>=C2=A0 =C2=A0 =C2=A0Reachability TLV.
>
>=C2=A0 =C2=A0 =C2=A0##PP
>=C2=A0 =C2=A0 =C2=A0do we really need this? If the originator does the = right thing, then we
>=C2=A0 =C2=A0 =C2=A0don't have the problem. Cross referencing data = between different TLVs
>=C2=A0 =C2=A0 =C2=A0complicates the implementations.
>
>
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=C2=A0 If a router receives a Pre= fix Attribute Flags Sub-TLV in the
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=C2=A0=C2=A0SRv6 Locator TLV but = not in the Prefix Reachability TLV,
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0the router should use the = prefix attribute flags received in
>=C2=A0 =C2=A0 =C2=A0the SRv6 Locator TLV.
>
>=C2=A0 =C2=A0 =C2=A0##PP
>=C2=A0 =C2=A0 =C2=A0same as above.
>
>=C2=A0 =C2=A0 =C2=A0thanks,
>=C2=A0 =C2=A0 =C2=A0Peter
>
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 > =3D=3D=3D=3D end insert new text =3D=3D=3D=3D= =3D=3D=3D=3D=3D
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=C2=A0 The same prefix/SRv6 Locat= or can be advertised by multiple
>=C2=A0 =C2=A0 =C2=A0routers.
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=C2=A0 If at least one of them se= ts the A-Flag in its advertisement, the
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=C2=A0 prefix/SRv6 Locator SHOULD= be considered as anycast..
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 > =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 > On Tue, Jan 21, 2020 at 6:15 PM Christian Hop= ps
>=C2=A0 =C2=A0 =C2=A0<chopps@chopps.org <mailto:chopps@chopps.org>
>=C2=A0 =C2=A0 =C2=A0 > <mailto:chopps@chopps.org <mailto:chopps@chopps.org>>> wrote:<= br> >=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0This begins a 2 week WG La= st Call, ending after Feb 4, 2020, for
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0draft-ietf-lsr-isis-srv6-e= xtensions
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0https://datatracker.ietf..org/doc/draft-ietf-ls= r-isis-srv6-extensions/
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0
>=C2=A0 =C2=A0 =C2=A0 =C2=A0<https://datatracker.ietf.org/doc/draft-ietf-lsr-isis-srv6-extensions/>
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0Authors please indicate if= you aware of any other IPR beyond
>=C2=A0 =C2=A0 =C2=A0what is
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0posted:
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 > https://datatracker.ietf.org/ipr= /3796/
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0Thanks,
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0Chris & Acee.
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0__________________________= _____________________
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0Lsr mailing list
>=C2=A0 =C2=A0 =C2=A0 > Lsr@ietf.org <mailto:Lsr@ietf.org> <mailto:Lsr@ietf.org
>=C2=A0 =C2=A0 =C2=A0<mailto:Lsr@ietf.org>>
>=C2=A0 =C2=A0 =C2=A0 > https://www.ietf.org/mailman/= listinfo/lsr
>=C2=A0 =C2=A0 =C2=A0 >
>

--000000000000edcaa4059dc76e72-- From nobody Tue Feb 4 15:29:31 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 149A212011F for ; Tue, 4 Feb 2020 15:29:29 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.998 X-Spam-Level: X-Spam-Status: No, score=-1.998 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_HELO_NONE=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 bmK0BGgd0Gav for ; Tue, 4 Feb 2020 15:29:27 -0800 (PST) Received: from mail-qt1-x831.google.com (mail-qt1-x831.google.com [IPv6:2607:f8b0:4864:20::831]) (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 81F681200B7 for ; Tue, 4 Feb 2020 15:29:27 -0800 (PST) Received: by mail-qt1-x831.google.com with SMTP id c5so121702qtj.6 for ; Tue, 04 Feb 2020 15:29:27 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:from:date:message-id:subject:to; bh=hBR8gJuw3BPb+6YhQpN5lBHUCqUvo4NQSzjUno/ozEk=; b=gR9jBpO3Z/C+F1ANoot07Do8DC8qHZBZmniowwCikTg5iaUgloizyPiY7pKo5sZ8hr Y5tyXmm4Da49Ovcpllzir1GhjrS2ewi8nR1EzFx6CeUFnbZybiCv40GH1ap1BizrT63y QVZ24vZk7bEhNtIMqDpmtJboV90eJex9s/F+DcNySnUQYXZqUbfrdjdnOQQ0+uTbOUZo 7cxdD0hsfFPahqcRYZQ+oe+2YAqgjUeFYubNAwbQUjq1kD4ngh5y8+u1b5PtIOJCVcx9 CdojiKQldF926tp96TBp9MyLJKgo1GajKlitIDaCKoZWDdOP/OTtRnILJLaT2PzHTmoP R/6Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:from:date:message-id:subject:to; bh=hBR8gJuw3BPb+6YhQpN5lBHUCqUvo4NQSzjUno/ozEk=; b=uURjaIHkLxENLCWzBDj8cc0kcdZwg2Agv/2Y4LApRgNXJebSevHU/rBtoNxECn+1hy cAxzJh4kdAf6gEV1PL/skeoP/Bm0I6vS63HgypzL/NAEXgHtnh1b0Q4eZRFnqeOkfzM0 eGeMSpJOXncZ5k7ujVht/8rrQ6aq/yYXPqs+kEgVBP64eLMGC+AHPqAaHrbXhNPwuvQb KF+7TwqelHiCgMr2yfP13v08QT2oYI0THExqpmcnUTCnOsZ7biEbE+8dXZkI47Q5h+2K 0r+RUkZ9perdniFS24dqzWh3iSqwV5pWc13LOfQKtryueB+19g/2cgkN9/p9wUvxKPJs uRzg== X-Gm-Message-State: APjAAAWr8AsRFgCVquJrip7ev2e6TSvMJqmvPrrIJ7wZmsxWWUXWVhJE RZMzTyXQaeJ/M3nSplEPI01VaaifMgE+d0YB5GSolfzJ X-Google-Smtp-Source: APXvYqyJSfusgOaC16/D+XAyMmZdi0d02CyavraGeDckMgLGwZsi1Q9zUsGfPg2QTiuNzgxD2FMN7RegzqD9cJY1ZQw= X-Received: by 2002:aed:2e02:: with SMTP id j2mr30076765qtd.370.1580858966481; Tue, 04 Feb 2020 15:29:26 -0800 (PST) MIME-Version: 1.0 From: Chris Bowers Date: Tue, 4 Feb 2020 17:27:06 -0600 Message-ID: To: lsr@ietf.org Content-Type: multipart/alternative; boundary="000000000000231f7a059dc86966" Archived-At: Subject: [Lsr] more feedback on draft-ietf-lsr-isis-srv6-extensions-04 X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 04 Feb 2020 23:29:29 -0000 --000000000000231f7a059dc86966 Content-Type: text/plain; charset="UTF-8" LSR, I have some more feedback on draft-ietf-lsr-isis-srv6-extensions-04 that I am putting in a separate thread so as not to confuse the other thread related to N and A flags. ======= The end of Section 5 points out several issues that can result in forwarding not working correctly. The reader might think that the next section is going to discuss protocol mechanisms to avoid these issues. Since this is not the case, I think it would be helpful to add some text near the end of Section 5 like: "In order to ensure correct forwarding, network operators should take steps to make sure that this requirement is not compromised." ========= In section 6, I think it would be useful to explicitly state the following requirement for SRv6 Locator TLVs and their associated SRv6 SIDs: "When anycast SRv6 Locator TLVs for the same prefix are advertised by different nodes, the SRv6 Locator TLVs MUST all advertise identical sets of SRv6 SIDs." Section 3.3 of RFC 8402 has similar text: "Within an anycast group, all routers in an SR domain MUST advertise the same prefix with the same SID value." That text only refers to a single SID value, so it seems somewhat open to interpretation text in the context of an SRv6 locator that carries multiple SRv6 SIDs. I think it would be better to avoid any potential ambiguity by using the text proposed above in this document. ========= In section 12.1.2. "Revised sub-TLV table" it might avoid an extra interaction with IANA to add a line for the flex-algo prefix metric (currently 6) indicating "n" for TLV#27. ========== Thanks, Chris --000000000000231f7a059dc86966 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
LSR,

I have some more feedba= ck on draft-ietf-lsr-isis-srv6-extensions-04 that I am putting in a separat= e thread so as not to confuse the other thread related to N and A flags.=C2= =A0

=3D=3D=3D=3D=3D=3D=3D
T= he end of Section 5 points out several issues that can result in forwarding= not working correctly.=C2=A0 The reader might think that the next s= ection is going to discuss protocol mechanisms to avoid these issues.=C2=A0= Since this is not the case, I think it would be helpful to add some text n= ear the end of Section 5 like:

"In order to ensure correct forwarding= , network operators should take steps to make sure that this requirement is not compromised."


=3D= =3D=3D=3D=3D=3D=3D=3D=3D

In section 6, I think it = would be useful to explicitly state the following requirement for SRv6 Loca= tor TLVs and their associated SRv6 SIDs:


"When anycast SRv6 Locator TLVs for the = same prefix are advertised by different nodes, the SRv6 Locator TLVs MUST

Section 3.3 of = RFC 8402 has similar text: "Within an anycast group, all routers in an= SR domain MUST advertise the same prefix with the same SID value."=C2= =A0 That text only refers to a single SID value, so it seems somewhat open = to interpretation text in the context of an SRv6 locator that carries multi= ple SRv6 SIDs. I think it would be better to avoid any potential ambiguity = by using the text proposed above in this document.

=3D=3D=3D=3D=3D=3D=3D=3D=3D

In section 12.1.2.  &=
quot;Revised sub-TLV table" it might avoid an extra interaction with I=
ANA to add a line for the flex-algo prefix metric (currently 6) indicating =
"n" for TLV#27.

=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

Thanks,
Chris
<=
/pre>
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Received: from aer-iport-1.cisco.com (aer-iport-1.cisco.com [173.38.203.51]) (using TLSv1.2 with cipher DHE-RSA-SEED-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 89F84120018 for ; Wed, 5 Feb 2020 03:13:56 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=2126; q=dns/txt; s=iport; t=1580901236; x=1582110836; h=subject:to:references:from:message-id:date:mime-version: in-reply-to:content-transfer-encoding; bh=cbi/Ncdorg1oLWuo0uNGIlINFGQgcxgkb0WEHX6+hNs=; b=f4uVABIExWHyo99jKBD5L1VSp8m5JvHu8fMXartJ5tnOexd5lGflhvsF OYr+OaaBiBQPngB10NsvTFeLMetGEtElaZ+ryZ3VG22fC0RFOJjXaC07u bmzlRde9rNVCI82SCaQn0Z/9D1JuYdcD2r/rExvMTUsZ0mdtc3dcM2gUY g=; X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: =?us-ascii?q?A0CXAwDYojpe/xbLJq1lHAEBAQEBBwE?= =?us-ascii?q?BEQEEBAEBgXuDaiAShD+JA4gcmzsJAQEBDi8BAYRAAoJdOBMCAw0BAQQBAQE?= =?us-ascii?q?CAQUEbYVDhWYBAQEBAgEjDwEFLyILGAICJgICVwYBDAgBAYMiglwgqyB1gTK?= 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aer-core-4.cisco.com Archived-At: Subject: Re: [Lsr] more feedback on draft-ietf-lsr-isis-srv6-extensions-04 X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 05 Feb 2020 11:13:59 -0000 Hi Chris, On 05/02/2020 00:27, Chris Bowers wrote: > LSR, > > I have some more feedback on draft-ietf-lsr-isis-srv6-extensions-04 that > I am putting in a separate thread so as not to confuse the other thread > related to N and A flags. > > ======= > The end of Section 5 points out several issues that can result in > forwarding not working correctly.  The reader might think that the next > section is going to discuss protocol mechanisms to avoid these issues. > Since this is not the case, I think it would be helpful to add some text > near the end of Section 5 like: > > "In order to ensure correct forwarding, network operators should take > steps to make sure that this requirement is not compromised." ##PP sure. > > > ========= > > In section 6, I think it would be useful to explicitly state the > following requirement for SRv6 Locator TLVs and their associated SRv6 SIDs: > > > "When anycast SRv6 Locator TLVs for the same prefix are advertised by > different nodes, the SRv6 Locator TLVs MUST all advertise identical sets > of SRv6 SIDs." ##PP here's the proposed text: All the nodes advertising the same anycast locator MUST instantiate the exact same set of SIDs under such anycast locator. > > > Section 3.3 of RFC 8402 has similar text: "Within an anycast group, all > routers in an SR domain MUST advertise the same prefix with the same SID > value."  That text only refers to a single SID value, so it seems > somewhat open to interpretation text in the context of an SRv6 locator > that carries multiple SRv6 SIDs. I think it would be better to avoid any > potential ambiguity by using the text proposed above in this document. > > ========= > > In section 12.1.2. "Revised sub-TLV table" it might avoid an extra > interaction with IANA to add a line for the flex-algo prefix metric > (currently 6) indicating "n" for TLV#27. ##PP flex-algo prefix metric is not defined in this draft, so I don't believe we can mention it here. thanks, Peter > > ========== > > Thanks, > > Chris > > > From nobody Wed Feb 5 03:28:12 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 8B46712007A; Wed, 5 Feb 2020 03:28:10 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -14.502 X-Spam-Level: X-Spam-Status: No, score=-14.502 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, RCVD_IN_DNSWL_HI=-5, 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 trM9Ep_AyE_t; Wed, 5 Feb 2020 03:28:07 -0800 (PST) Received: from aer-iport-3.cisco.com (aer-iport-3.cisco.com [173.38.203.53]) (using TLSv1.2 with cipher DHE-RSA-SEED-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 7EBCB12006F; Wed, 5 Feb 2020 03:28:06 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=18612; q=dns/txt; s=iport; t=1580902086; x=1582111686; h=subject:to:cc:references:from:message-id:date: mime-version:in-reply-to:content-transfer-encoding; bh=RPnpfRPgfdVcUxNQDp8jH0tNo0RAiDIDMeXF5ZSFA/g=; b=U1i5quH/hFemvH64DInN8czwM8zBGMQj4Z/IsH/d7A0nvMnN0ohwrRV9 +2jk+IAGepmmwaCXTZqb6dXY66BV105SAdR1XaPEIzK2LC34f4LMeMXl9 1banjD2S9ex5LtaX/eZe8sioUaeLZOwrAnwkJvULnnhQj1VEm9JL/At5q Y=; X-IronPort-AV: E=Sophos;i="5.70,403,1574121600"; d="scan'208";a="20668029" Received: from aer-iport-nat.cisco.com (HELO aer-core-1.cisco.com) ([173.38.203.22]) by aer-iport-3.cisco.com with ESMTP/TLS/DHE-RSA-SEED-SHA; 05 Feb 2020 11:28:04 +0000 Received: from [10.147.24.41] ([10.147.24.41]) by aer-core-1.cisco.com (8.15.2/8.15.2) with ESMTP id 015BS4a0016169; Wed, 5 Feb 2020 11:28:04 GMT To: Chris Bowers Cc: "Les Ginsberg (ginsberg)" , lsr-ads@ietf.org, Christian Hopps , "Acee Lindem (acee)" , lsr@ietf.org References: <122B138F-AA4F-4C7C-969C-755DF15F5744@chopps.org> <86b274ad-e26b-029b-a36f-01febc03027a@cisco.com> From: Peter Psenak Message-ID: <14f7392b-0139-0e88-a40a-45dbfcfa9ab0@cisco.com> Date: Wed, 5 Feb 2020 12:28:00 +0100 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:60.0) Gecko/20100101 Thunderbird/60.7.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit X-Outbound-SMTP-Client: 10.147.24.41, [10.147.24.41] X-Outbound-Node: aer-core-1.cisco.com Archived-At: Subject: Re: [Lsr] WG Last Call draft-ietf-lsr-isis-srv6-extensions X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 05 Feb 2020 11:28:10 -0000 Hi Chris, On 04/02/2020 23:17, Chris Bowers wrote: > Peter, > > Suppose I receive a locator advertisement from router R7 with > locator = 7777::/64 and End-SID 7777::1.  I would like to be able to use > End-SID 7777::1 as > a Node-SID when constructing traffic engineered paths.  That is, I want > to know that > the person or system that configured R7 believes that 7777::/64 > is NOT owned by more than one router within the same routing domain. ##PP sure, if the A-bit is not set, you should be fine to pick the SID from a locator. Please see below why. > > Since we are going with Interpretation I) below, a prefix can be (a) a > Node Prefix, (b) an Anycast Prefix, > or (c) neither of them. ##PP above is correct in general. However, given that locator is non-/128, N-bit does not apply per RFC7794. So for a locator you only have (b) or (c) and you would only want to avoid (b) for what you want to do above. > If I receive an RFC7794 advertisement from R7 > for 7777::/64 with N=0, A=0, > I can only conclude that 7777::/64 is either (a) a Node Prefix or (c) > neither a Node Prefix nor an > Anycast Prefix. Using the N-flag for a non-/128 would allow us to > unambiguously indicate that > 7777::/64 is a Node Prefix, so we can use the associated End-SID 7777::1 > in a manner > consistent with the knowledge that 7777::/64 is NOT owned by more than > one router > within the same routing domain. > > One other small point relates to the statement below that "locators are > never /128". > I don't think it would be very useful to configure a /128 locator, since > it only has > space for one SRv6 SID.   However, the current text of > draft-ietf-lsr-isis-srv6-extensions explicitly > allows the Loc-Size to be 1-128. ##PP agree, but I don't believe we need to put any special text to state the above, it's obvious. thanks, Peter > > Thanks, > Chris > > On Tue, Feb 4, 2020 at 2:44 AM Peter Psenak > wrote: > > Hi Chris, > > On 03/02/2020 14:39, Peter Psenak wrote: > >> I think a reasonable solution would be to remove the restriction > >> > >> on the N-flag to allow it to be used for non-/128 > prefixes/locators.  This > >> > >> would allow the three possible prefix-SIDs states to be easily > represented. > > ##PP > > right, that could be a possibility, which would allow SRv6 locator to > > have the "node" property, as locators are never /128. > > do you have a use case, where the locator would need a N-flag? > > I can not really think of any, so unless we have one, we better not > define an N-flag for a non-/128 locator prefix. > > thanks, > Peter > > On Mon, Feb 3, 2020 at 7:39 AM Peter Psenak > wrote: > > Hi Chris, > > adding to what Les has said. > Please see inline (##PP) > > On 31/01/2020 21:10, Chris Bowers wrote: > > Peter and Les, > > > > It seems to me that for the Node Flag in RFC7794 and the proposed > > Anycast Flag > > > > in draft-ietf-lsr-isis-srv6-extensions-04, we are ultimately > concerned with > > > > how to identify IGP-Node Segments and IGP-Anycast Segments, as > defined > > in RFC8402, > > > > the Segment Routing Architecture document. > > > > If this is the case, then the following text from RFC8402 is very > relevant. > > > > ============ > > > > 3.2.  IGP-Node Segment (Node-SID) > > > >     An IGP Node-SID MUST NOT be associated with a prefix that is > owned by > > > >     more than one router within the same routing domain.. > > > > 3.3.  IGP-Anycast Segment (Anycast-SID) > > > >     .... > > > >     An IGP-Anycast segment MUST NOT reference a particular node. > > > >     ..... > > > > ============ > > > > This text can be interpreted in two different ways. > > > > Interpretation I) > > > > A prefix-SID can have the following three possible states. > > > > Ia) Node-SID > > > > Ib) Anycast-SID > > > > Ic) neither Node-SID nor Anycast-SID > > ##PP > Prefix can either be Node Prefix, Anycast Prefix or neither of them. > > > > > > Interpretation II) > > > > A prefix-SID can have the following two possible states. > > > > IIa) Node-SID > > > > IIb) Anycast-SID > > > > If Interpretation I) is correct, then I think that the current > encodings in > > > > draft-ietf-lsr-isis-srv6-extensions-04 do not allow us > > > > to unambiguously identify a Node-SID for a non-/128 > > > > prefix/locator.  For example, the End-SIDs within a /64 locator > with the > > A-flag set could > > > > either be Ia) a Node-SID > > ##PP > rfc7794 does not allow the N-flag to be set for non-/128 prefix, so > above is not possible for /64 locator at the moment. > > If the A-flag is set, it is an anycast locator. > > > > >or Ic) neither Node-SID nor Anycast-SID. > > ##PP > if the A-flag was not set for /64 locator, above would be correct, but > given that the A-flag is set, it is clearly just Anycast locator. > > > > > I think a reasonable solution would be to remove the restriction > > > > on the N-flag to allow it to be used for non-/128 > prefixes/locators.  This > > > > would allow the three possible prefix-SIDs states to be easily > represented. > > ##PP > right, that could be a possibility, which would allow SRv6 locator to > have the "node" property, as locators are never /128. > > thanks, > Peter > > > > > > If Interpretation II) is correct, then I think that the current > > encodings in > > > > draft-ietf-lsr-isis-srv6-extensions-04 need clarification with > respect to > > > > how to interpret a /128 prefix/locator advertisement with N=0, > A=0.. We > > > > have to decide between interpreting the End-SIDs within the locator > > > > as either Node-SIDs or Anycast-SIDs, since there is no third option. > > > > I think that interpreting the End-SIDs as Anycast-SIDs in the > N=0, A=0 > > > > case is preferable because it preserves backwards compatibility. > > > > > > Thanks, > > > > Chris > > > > > > > > On Thu, Jan 30, 2020 at 4:02 AM Peter Psenak > > >> wrote: > > > >     Hi Chris, > > > >     please see inline (##PP) > > > >     On 29/01/2020 17:25, Chris Bowers wrote: > >      > I would like to proposed the following text to make section 6 > >     more clear. > >      > > >      > Thanks, > >      > Chris > >      > > >      > ==================== > >      > > >      >   (existing text) > >      > > >      > > >      > 6.  Advertising Anycast Property > >      > > >      >     Both prefixes and SRv6 Locators may be configured as > anycast > >     and as > >      > > >      >     such the same value can be advertised by multiple > routers.  It is > >      > > >      >     useful for other routers to know that the > advertisement is for an > >      > > >      >     anycast identifier. > >      > > >      >     A new flag in "Bit Values for Prefix Attribute Flags > Sub-TLV" > >      > > >      >     registry [RFC7794] is defined to advertise the anycast > property: > >      > > >      >         Bit #: 4 (Suggested - to be assigned by IANA) > >      > > >      >         Name: Anycast Flag (A-flag) > >      > > >      >         When the prefix/SRv6 locator is configured as anycast, > >     the A-flag > >      > > >      >         SHOULD be set. Otherwise, this flag MUST be clear. > >      > > >      >     The A-flag MUST be preserved when leaked between levels. > >      > > >      >     The A-flag and the N-flag MUST NOT both be set. > >      > > >      > ==== start insert new text ======= > >      > > >      > > >      > Certain use cases require prefixes/locators that uniquely > belong > >     to a node. > >      > > >      > Since prefixes/locators which are not /128 should not have > the N > >     bit set, > >      > > >      > this node local uniqueness is decided based on A bit for > non-/128 > >     prefixes. > > > >     ##PP > >     above does not seem correct. Above seems to imply that for > non-/128 > >     prefix, A-bit is replacement of N-bit. > > > >     A-bit applies to both /128 and non-/128 prefixes equally. > > > >     Current draft clearly states what to do when both N a A bits > are set. > > > > > > > >      > > >      >     When a prefix/locator iscategorized as anycast, it > does not > >     uniquely > >      > belong > >      > > >      >     to a node and cannot be used for such use cases.  The > rules > >     below > >      > specify > >      > > >      >     how to determine whether or not a prefix/locator should be > >     treated > >      > as anycast > >      > > >      >     in various situations. > >      > > >      > > >      >     [RFC7794] contains the following restriction on the > >     interpretation of the N-flag. > >      > > >      >     "If the flag is set and the prefix length is NOT a > host prefix > >      > > >      >      (/32 for IPV4, /128 forIPv6), then the flag MUST be > ignored." > >      > > >      >     The current document does NOT modify this restriction > on the > >     interpretation of > >      > > >      >     the N-flag imposed by [RFC7794]. > > > >     ##PP > >     I don't think above text is needed. And I don't think above is > >     completely correct, as we define a new case in which the N-bit > >     should be > >     ignored (when A-bit is set). > > > > > >      > > >      >     For a prefix/SRv6 Locator advertisement with a /128 > >     prefix/locator, > >      > > >      >     if both N-flag and A-flag are set, the receiving > router MUST > >     treat the > >      > > >      >     prefix advertisement as anycast. > > > >     ##PP > >     we have following text in the draft already: > > > >     "If both N-flag and A-flag are set in the prefix/SRv6 Locator > >          advertisement, the receiving routers MUST ignore the > N-flag." > > > > > > > >      > > >      >     For a prefix/SRv6 Locator advertisement with a /128 > >     prefix/locator, > >      > > >      >     if the N-flag and A-flag are NOT set, the receiving > routers > >      > > >      >     MUST treat the prefix advertisement as anycast.. > > > >     ##PP > >     I don't think above statement is correct. Why a node cannot > advertise a > >     /128 prefix which is not an anycast one and does not have a > N-bit set? > > > > > > > >      > This rule ensures the > >      > > >      >     correct interpretation of a prefix advertisement > originated by > >      > > >      >     a router that is not SRv6 capable and originates a legacy > >      > > >      >     Prefix Attribute Flags Sub-TLV based on [RFC7794] alone. > >      > > >      >     For a prefix/SRv6 Locator advertisement with a > prefix/locator > >     that > >      > > >      >     is NOT /128, the N-flag must be ignored, so the > setting of the > >      > > >      >     A-flag determines the anycast treatment of the prefix > >     advertisement. > > > >     ##PP > >     A-flag does that regardless of the length of the prefix. > > > > > >      > > >      >     The Prefix Attribute Flags Sub-TLV can be carried in > the SRv6 > >      > Locator TLV > >      > > >      >     as well as the Prefix Reachability TLVs.  When a router > >     originates > >      > > >      >     both the Prefix Reachability TLV and the SRv6 Locator > TLV for > >     a given > >      > > >      >     prefix, and the router is originating the Prefix Attribute > >     Flags Sub-TLV > >      > > >      >     in one of the TLVs, the router SHOULD advertise identical > >     versions of the > >      > > >      >     Prefix Attribute Flags Sub-TLV in both TLVs. > > > >     ##PP > >     Above seems a good suggestion. Will add it. > > > >      > > >      > > >      > > >      >     If a router receives one Prefix Attribute Flags > Sub-TLV in the > >      > > >      >     Prefix Reachability TLV and another in the SRv6 > Locator TLV, > >     the router should > >      > > >      >     use the prefix attribute flags received in the Prefix > >     Reachability TLV. > > > >     ##PP > >     above contradicts what you suggest in the previous paragraph, > where you > >     suggest we need to advertise with both prefix and locator, > and here you > >     suggest we ignore what we received in the locator. > > > >     Are you talking about the case where the content of the Prefix > >     Attribute > >     Flags Sub-TLV is different in prefix vs locator? > >      > > >      > > >      > > >      >     If a router receives a Prefix Attribute Flags Sub-TLV > in the > >      > > >      >     Prefix Reachability TLV but not in the SRv6 Locator > TLV, the > >     router should > >      > > >      >     use the prefix attribute flags received in the Prefix > >     Reachability TLV. > > > >     ##PP > >     do we really need this? If the originator does the right > thing, then we > >     don't have the problem. Cross referencing data between > different TLVs > >     complicates the implementations. > > > > > >      > > >      > > >      > > >      >     If a router receives a Prefix Attribute Flags Sub-TLV > in the > >      > > >      >     SRv6 Locator TLV but not in the Prefix Reachability TLV, > >      > > >      >     the router should use the prefix attribute flags > received in > >     the SRv6 Locator TLV. > > > >     ##PP > >     same as above. > > > >     thanks, > >     Peter > > > >      > > >      > ==== end insert new text ========= > >      > > >      >     The same prefix/SRv6 Locator can be advertised by multiple > >     routers. > >      > > >      >     If at least one of them sets the A-Flag in its > advertisement, the > >      > > >      >     prefix/SRv6 Locator SHOULD be considered as anycast.. > >      > > >      > > >      > > >      > =================== > >      > > >      > > >      > On Tue, Jan 21, 2020 at 6:15 PM Christian Hopps > >      > > > >      > > >>> wrote: > >      > > >      >     This begins a 2 week WG Last Call, ending after Feb 4, > 2020, for > >      >     draft-ietf-lsr-isis-srv6-extensions > >      > > >      > > > > https://datatracker.ietf..org/doc/draft-ietf-lsr-isis-srv6-extensions/ > >      > > > >   > >      > > >      >     Authors please indicate if you aware of any other IPR > beyond > >     what is > >      >     posted: > >      > > >      > https://datatracker.ietf.org/ipr/3796/ > >      > > >      >     Thanks, > >      >     Chris & Acee. > >      >     _______________________________________________ > >      >     Lsr mailing list > >      > Lsr@ietf.org > > >     >> > >      > https://www.ietf.org/mailman/listinfo/lsr > >      > > > > From nobody Wed Feb 5 17:25:34 2020 Return-Path: X-Original-To: lsr@ietf.org Delivered-To: lsr@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id 8D41912001B; Wed, 5 Feb 2020 17:25:30 -0800 (PST) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: internet-drafts@ietf.org To: Cc: lsr@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 6.116.1 Auto-Submitted: auto-generated Precedence: bulk Reply-To: lsr@ietf.org Message-ID: <158095233050.31172.4217819467448910537@ietfa.amsl.com> Date: Wed, 05 Feb 2020 17:25:30 -0800 Archived-At: Subject: [Lsr] I-D Action: draft-ietf-ospf-sr-yang-11.txt X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 06 Feb 2020 01:25:31 -0000 A New Internet-Draft is available from the on-line Internet-Drafts directories. This draft is a work item of the Link State Routing WG of the IETF. Title : YANG Data Model for OSPF SR (Segment Routing) Protocol Authors : Derek Yeung Yingzhen Qu Jeffrey Zhang Ing-Wher Chen Acee Lindem Filename : draft-ietf-ospf-sr-yang-11.txt Pages : 27 Date : 2020-02-05 Abstract: This document defines a YANG data model that can be used to configure and manage OSPF Segment Routing. The model is based on YANG 1.1 as defined in RFC 7950 and conforms to the Network Management Datastore Architecture (NDMA) as described in RFC 8342. The IETF datatracker status page for this draft is: https://datatracker.ietf.org/doc/draft-ietf-ospf-sr-yang/ There are also htmlized versions available at: https://tools.ietf.org/html/draft-ietf-ospf-sr-yang-11 https://datatracker.ietf.org/doc/html/draft-ietf-ospf-sr-yang-11 A diff from the previous version is available at: https://www.ietf.org/rfcdiff?url2=draft-ietf-ospf-sr-yang-11 Please note that it may take a couple of minutes from the time of submission until the htmlized version and diff are available at tools.ietf.org. Internet-Drafts are also available by anonymous FTP at: ftp://ftp.ietf.org/internet-drafts/ From nobody Thu Feb 6 22:16:42 2020 Return-Path: X-Original-To: lsr@ietf.org Delivered-To: lsr@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id 4C1391200A4; Thu, 6 Feb 2020 22:16:40 -0800 (PST) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: internet-drafts@ietf.org To: Cc: lsr@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 6.117.0 Auto-Submitted: auto-generated Precedence: bulk Reply-To: lsr@ietf.org Message-ID: <158105620017.16040.6994980997301174132@ietfa.amsl.com> Date: Thu, 06 Feb 2020 22:16:40 -0800 Archived-At: Subject: [Lsr] I-D Action: draft-ietf-isis-te-app-10.txt X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 07 Feb 2020 06:16:40 -0000 A New Internet-Draft is available from the on-line Internet-Drafts directories. This draft is a work item of the Link State Routing WG of the IETF. Title : IS-IS TE Attributes per application Authors : Les Ginsberg Peter Psenak Stefano Previdi Wim Henderickx John Drake Filename : draft-ietf-isis-te-app-10.txt Pages : 20 Date : 2020-02-06 Abstract: Existing traffic engineering related link attribute advertisements have been defined and are used in RSVP-TE deployments. Since the original RSVP-TE use case was defined, additional applications (e.g., Segment Routing Traffic Engineering, Loop Free Alternate) have been defined which also make use of the link attribute advertisements. In cases where multiple applications wish to make use of these link attributes the current advertisements do not support application specific values for a given attribute nor do they support indication of which applications are using the advertised value for a given link. This document introduces new link attribute advertisements which address both of these shortcomings. The IETF datatracker status page for this draft is: https://datatracker.ietf.org/doc/draft-ietf-isis-te-app/ There are also htmlized versions available at: https://tools.ietf.org/html/draft-ietf-isis-te-app-10 https://datatracker.ietf.org/doc/html/draft-ietf-isis-te-app-10 A diff from the previous version is available at: https://www.ietf.org/rfcdiff?url2=draft-ietf-isis-te-app-10 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 Feb 6 22:51:06 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 5474B120164; Thu, 6 Feb 2020 22:51:05 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -14.499 X-Spam-Level: X-Spam-Status: No, score=-14.499 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, RCVD_IN_DNSWL_HI=-5, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, 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 header.b=i9Dshw6v; dkim=pass (1024-bit key) header.d=cisco.onmicrosoft.com header.b=hLNHKaHB Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com 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ZXRoaW5nIGZvciB0aGUgbWFya2V0cGxhY2UgdG8gZGV0ZXJtaW5lDQo= From nobody Fri Feb 7 14:04:01 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id E6D8D1200E5 for ; Fri, 7 Feb 2020 14:03:59 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.998 X-Spam-Level: X-Spam-Status: No, score=-1.998 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_HELO_NONE=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 x4LkX-9tgQqX for ; Fri, 7 Feb 2020 14:03:57 -0800 (PST) Received: from 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<7d115b05-03df-6cbd-167b-37d4aff8a0ad@cisco.com> From: Chris Bowers Date: Fri, 7 Feb 2020 16:01:34 -0600 Message-ID: To: Peter Psenak Cc: lsr@ietf.org Content-Type: multipart/alternative; boundary="000000000000ea60cc059e039075" Archived-At: Subject: Re: [Lsr] more feedback on draft-ietf-lsr-isis-srv6-extensions-04 X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 07 Feb 2020 22:04:00 -0000 --000000000000ea60cc059e039075 Content-Type: text/plain; charset="UTF-8" Thanks. The proposed text below looks good to me. Chris On Wed, Feb 5, 2020 at 5:13 AM Peter Psenak wrote: > Hi Chris, > > On 05/02/2020 00:27, Chris Bowers wrote: > > LSR, > > > > I have some more feedback on draft-ietf-lsr-isis-srv6-extensions-04 that > > I am putting in a separate thread so as not to confuse the other thread > > related to N and A flags. > > > > ======= > > The end of Section 5 points out several issues that can result in > > forwarding not working correctly. The reader might think that the next > > section is going to discuss protocol mechanisms to avoid these issues. > > Since this is not the case, I think it would be helpful to add some text > > near the end of Section 5 like: > > > > "In order to ensure correct forwarding, network operators should take > > steps to make sure that this requirement is not compromised." > > ##PP > sure. > > > > > > > ========= > > > > In section 6, I think it would be useful to explicitly state the > > following requirement for SRv6 Locator TLVs and their associated SRv6 > SIDs: > > > > > > "When anycast SRv6 Locator TLVs for the same prefix are advertised by > > different nodes, the SRv6 Locator TLVs MUST all advertise identical sets > > of SRv6 SIDs." > > ##PP > here's the proposed text: > > All the nodes advertising the same anycast locator MUST instantiate the > exact same set of SIDs under such anycast locator. > > > > > > > Section 3.3 of RFC 8402 has similar text: "Within an anycast group, all > > routers in an SR domain MUST advertise the same prefix with the same SID > > value." That text only refers to a single SID value, so it seems > > somewhat open to interpretation text in the context of an SRv6 locator > > that carries multiple SRv6 SIDs. I think it would be better to avoid any > > potential ambiguity by using the text proposed above in this document. > > > > ========= > > > > In section 12.1.2. "Revised sub-TLV table" it might avoid an extra > > interaction with IANA to add a line for the flex-algo prefix metric > > (currently 6) indicating "n" for TLV#27. > > ##PP > flex-algo prefix metric is not defined in this draft, so I don't believe > we can mention it here. > > thanks, > Peter > > > > > ========== > > > > Thanks, > > > > Chris > > > > > > > > --000000000000ea60cc059e039075 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Thanks.=C2=A0 The proposed text below looks good to m= e.

Chris

<= div dir=3D"ltr" class=3D"gmail_attr">On Wed, Feb 5, 2020 at 5:13 AM Peter P= senak <ppsenak@cisco.com> wr= ote:
Hi Chris,
On 05/02/2020 00:27, Chris Bowers wrote:
> LSR,
>
> I have some more feedback on draft-ietf-lsr-isis-srv6-extensions-04 th= at
> I am putting in a separate thread so as not to confuse the other threa= d
> related to N and A flags.
>
> =3D=3D=3D=3D=3D=3D=3D
> The end of Section 5 points out several issues that can result in
> forwarding not working correctly.=C2=A0 The reader might think that th= e next
> section is going to discuss protocol mechanisms to avoid these issues.= =C2=A0
> Since this is not the case, I think it would be helpful to add some te= xt
> near the end of Section 5 like:
>
> "In order to ensure correct forwarding, network operators should = take
> steps to make sure that this requirement is not compromised."

##PP
sure.

>
>
> =3D=3D=3D=3D=3D=3D=3D=3D=3D
>
> In section 6, I think it would be useful to explicitly state the
> following requirement for SRv6 Locator TLVs and their associated SRv6 = SIDs:
>
>
> "When anycast SRv6 Locator TLVs for the same prefix are advertise= d by
> different nodes, the SRv6 Locator TLVs MUST all advertise identical se= ts
> of SRv6 SIDs."

##PP
here's the proposed text:

All the nodes advertising the same anycast locator MUST instantiate the exact same set of SIDs under such anycast locator.

>
>
> Section 3.3 of RFC 8402 has similar text: "Within an anycast grou= p, all
> routers in an SR domain MUST advertise the same prefix with the same S= ID
> value."=C2=A0 That text only refers to a single SID value, so it = seems
> somewhat open to interpretation text in the context of an SRv6 locator=
> that carries multiple SRv6 SIDs. I think it would be better to avoid a= ny
> potential ambiguity by using the text proposed above in this document.=
>
> =3D=3D=3D=3D=3D=3D=3D=3D=3D
>
> In section 12.1.2. "Revised sub-TLV table" it might avoid an= extra
> interaction with IANA to add a line for the flex-algo prefix metric > (currently 6) indicating "n" for TLV#27.

##PP
flex-algo prefix metric is not defined in this draft, so I don't believ= e
we can mention it here.

thanks,
Peter

>
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
>
> Thanks,
>
> Chris
>
>
>

--000000000000ea60cc059e039075-- From nobody Tue Feb 11 10:05:33 2020 Return-Path: X-Original-To: lsr@ietf.org Delivered-To: lsr@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id 5ECF11209D5; Tue, 11 Feb 2020 10:05:24 -0800 (PST) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: IETF Secretariat To: Cc: lsr@ietf.org, ipr-announce@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 6.117.0 Auto-Submitted: auto-generated Precedence: bulk Message-ID: <158144432435.19907.5525806615259745941@ietfa.amsl.com> Date: Tue, 11 Feb 2020 10:05:24 -0800 Archived-At: Subject: [Lsr] IPR Disclosure Arista Networks, Inc.'s Statement about IPR related to draft-ietf-lsr-dynamic-flooding X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 11 Feb 2020 18:05:29 -0000 Dear Tony Li, Peter Psenak, Les Ginsberg, Huaimo Chen, Tony Przygienda, Dave Cooper, Luay Jalil, Srinath Dontula: An IPR disclosure that pertains to your Internet-Draft entitled "Dynamic Flooding on Dense Graphs" (draft-ietf-lsr-dynamic-flooding) was submitted to the IETF Secretariat on 2020-02-08 and has been posted on the "IETF Page of Intellectual Property Rights Disclosures" (https://datatracker.ietf.org/ipr/4017/). The title of the IPR disclosure is "Arista Networks, Inc.'s Statement about IPR related to draft-ietf-lsr-dynamic-flooding" Thank you IETF Secretariat From nobody Tue Feb 11 17:21:01 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 35C92120086; Tue, 11 Feb 2020 17:20:59 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.998 X-Spam-Level: X-Spam-Status: No, score=-1.998 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_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id r8OI4jF3cAb1; 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Tue, 11 Feb 2020 17:20:55 -0800 (PST) To: Christian Hopps , lsr@ietf.org Cc: lsr-ads@ietf.org, "Acee Lindem (acee)" References: <122B138F-AA4F-4C7C-969C-755DF15F5744@chopps.org> From: Ahmed Bashandy Message-ID: Date: Tue, 11 Feb 2020 17:20:53 -0800 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:68.0) Gecko/20100101 Thunderbird/68.4.1 MIME-Version: 1.0 In-Reply-To: <122B138F-AA4F-4C7C-969C-755DF15F5744@chopps.org> Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Content-Language: en-US Archived-At: Subject: Re: [Lsr] WG Last Call draft-ietf-lsr-isis-srv6-extensions X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 12 Feb 2020 01:20:59 -0000 As a co-author I support this draft and I am not aware of any undisclosed IPR related to this draft Ahmed On 1/21/20 4:14 PM, Christian Hopps wrote: > This begins a 2 week WG Last Call, ending after Feb 4, 2020, for draft-ietf-lsr-isis-srv6-extensions > > https://datatracker.ietf.org/doc/draft-ietf-lsr-isis-srv6-extensions/ > > Authors please indicate if you aware of any other IPR beyond what is posted: > > https://datatracker.ietf.org/ipr/3796/ > > Thanks, > Chris & Acee. > _______________________________________________ > Lsr mailing list > Lsr@ietf.org > https://www.ietf.org/mailman/listinfo/lsr From nobody Wed Feb 12 01:26:04 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 6671F1201E4 for ; 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[93.147.205.177]) by smtp.gmail.com with ESMTPSA id a184sm7579354wmf.29.2020.02.12.01.25.55 (version=TLS1 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Wed, 12 Feb 2020 01:25:56 -0800 (PST) Mime-Version: 1.0 (Mac OS X Mail 8.2 \(2104\)) Content-Type: text/plain; charset=us-ascii From: stefano previdi In-Reply-To: <5BC4EF59-6A08-4A99-A688-1266E38C1506@chopps.org> Date: Wed, 12 Feb 2020 10:25:58 +0100 Cc: lsr@ietf.org, draft-li-lsr-ospfv3-srv6-extensions@ietf.org, lsr-ads@ietf.org, "Acee Lindem (acee)" Content-Transfer-Encoding: quoted-printable Message-Id: References: <5BC4EF59-6A08-4A99-A688-1266E38C1506@chopps.org> To: Christian Hopps X-Mailer: Apple Mail (2.2104) Archived-At: Subject: Re: [Lsr] WG Adoption Call for draft-li-lsr-ospfv3-srv6-extensions X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 12 Feb 2020 09:26:02 -0000 support. s. > On Jan 23, 2020, at 9:24 PM, Christian Hopps = wrote: >=20 > Hi LSR WG and Draft Authors, >=20 > The authors originally requested adoption back @ 105; however, some = comments were received and new version was produced. Moving forward... >=20 > This begins a 2 week WG adoption poll for the following draft: >=20 > https://datatracker.ietf.org/doc/draft-li-lsr-ospfv3-srv6-extensions/ >=20 > Please indicate your support or objection by Feb 6, 2020. >=20 > Authors, please respond indicating whether you are aware of any IPR = that applies to this draft. >=20 > Thanks, > Chris & Acee. > _______________________________________________ > Lsr mailing list > Lsr@ietf.org > https://www.ietf.org/mailman/listinfo/lsr From nobody Wed Feb 12 16:42:28 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 27F3B120013; Wed, 12 Feb 2020 16:42:26 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.898 X-Spam-Level: X-Spam-Status: No, score=-1.898 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_NONE=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 dxC9izFUxzbU; Wed, 12 Feb 2020 16:42:23 -0800 (PST) Received: from smtp.chopps.org (smtp.chopps.org [54.88.81.56]) by ietfa.amsl.com (Postfix) with ESMTP id 7F40712007C; Wed, 12 Feb 2020 16:42:23 -0800 (PST) Received: from [192.168.1.206] (66-227-211-29.dhcp.trcy.mi.charter.com [66.227.211.29]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by smtp.chopps.org (Postfix) with ESMTPSA id E1E3960B9E; Thu, 13 Feb 2020 00:42:22 +0000 (UTC) Content-Type: text/plain; charset=us-ascii Mime-Version: 1.0 (Mac OS X Mail 13.0 \(3608.40.2.2.4\)) From: Christian Hopps In-Reply-To: <5BC4EF59-6A08-4A99-A688-1266E38C1506@chopps.org> Date: Wed, 12 Feb 2020 19:42:21 -0500 Cc: Christian Hopps , draft-li-lsr-ospfv3-srv6-extensions@ietf.org, lsr-ads@ietf.org, "Acee Lindem (acee)" Content-Transfer-Encoding: quoted-printable Message-Id: References: <5BC4EF59-6A08-4A99-A688-1266E38C1506@chopps.org> To: lsr@ietf.org X-Mailer: Apple Mail (2.3608.40.2.2.4) Archived-At: Subject: Re: [Lsr] WG Adoption Call for draft-li-lsr-ospfv3-srv6-extensions X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 13 Feb 2020 00:42:26 -0000 The document is adopted. Authors, please repost as draft-ietf-lsr-ospfv3-srv6-extensions. Thanks, Chris & Acee. > On Jan 23, 2020, at 3:24 PM, Christian Hopps = wrote: >=20 > Hi LSR WG and Draft Authors, >=20 > The authors originally requested adoption back @ 105; however, some = comments were received and new version was produced. Moving forward... >=20 > This begins a 2 week WG adoption poll for the following draft: >=20 > https://datatracker.ietf.org/doc/draft-li-lsr-ospfv3-srv6-extensions/ >=20 > Please indicate your support or objection by Feb 6, 2020. >=20 > Authors, please respond indicating whether you are aware of any IPR = that applies to this draft. >=20 > Thanks, > Chris & Acee. > _______________________________________________ > Lsr mailing list > Lsr@ietf.org > https://www.ietf.org/mailman/listinfo/lsr >=20 From nobody Wed Feb 12 21:54:52 2020 Return-Path: X-Original-To: lsr@ietf.org Delivered-To: lsr@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id 542B01200B2; Wed, 12 Feb 2020 21:54:51 -0800 (PST) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: internet-drafts@ietf.org To: Cc: lsr@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 6.117.0 Auto-Submitted: auto-generated Precedence: bulk Reply-To: lsr@ietf.org Message-ID: <158157329119.18060.13185679406358058244@ietfa.amsl.com> Date: Wed, 12 Feb 2020 21:54:51 -0800 Archived-At: Subject: [Lsr] I-D Action: draft-ietf-lsr-ospfv3-srv6-extensions-00.txt X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 13 Feb 2020 05:54:51 -0000 A New Internet-Draft is available from the on-line Internet-Drafts directories. This draft is a work item of the Link State Routing WG of the IETF. Title : OSPFv3 Extensions for SRv6 Authors : Zhenbin Li Zhibo Hu Dean Cheng Ketan Talaulikar Peter Psenak Filename : draft-ietf-lsr-ospfv3-srv6-extensions-00.txt Pages : 23 Date : 2020-02-12 Abstract: Segment Routing (SR) allows for a flexible definition of end-to-end paths by encoding paths as sequences of topological sub-paths, called "segments". Segment Routing architecture can be implemented over an MPLS data plane as well as an IPv6 data plane. This draft describes the OSPFv3 extensions required to support Segment Routing over an IPv6 data plane (SRv6). The IETF datatracker status page for this draft is: https://datatracker.ietf.org/doc/draft-ietf-lsr-ospfv3-srv6-extensions/ There are also htmlized versions available at: https://tools.ietf.org/html/draft-ietf-lsr-ospfv3-srv6-extensions-00 https://datatracker.ietf.org/doc/html/draft-ietf-lsr-ospfv3-srv6-extensions-00 Please note that it may take a couple of minutes from the time of submission until the htmlized version and diff are available at tools.ietf.org. 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Thu, 13 Feb 2020 05:57:38 +0000 From: "Ketan Talaulikar (ketant)" To: Christian Hopps , "lsr@ietf.org" CC: "draft-li-lsr-ospfv3-srv6-extensions@ietf.org" , "lsr-ads@ietf.org" , "Acee Lindem (acee)" Thread-Topic: [Lsr] WG Adoption Call for draft-li-lsr-ospfv3-srv6-extensions Thread-Index: AQHV0issWwAmio9CWE+jt6TTlnytvqgYaJCAgABXaEA= Date: Thu, 13 Feb 2020 05:57:38 +0000 Message-ID: References: <5BC4EF59-6A08-4A99-A688-1266E38C1506@chopps.org> 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=ketant@cisco.com; x-originating-ip: [2001:420:c0c8:1005::596] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: 11343486-b097-4fa2-2677-08d7b049a17b x-ms-traffictypediagnostic: MWHPR11MB1677: x-ms-exchange-transport-forked: True x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:10000; x-forefront-prvs: 031257FE13 x-forefront-antispam-report: SFV:NSPM; SFS:(10009020)(4636009)(366004)(376002)(396003)(39860400002)(136003)(346002)(189003)(199004)(81166006)(8936002)(81156014)(52536014)(8676002)(5660300002)(9686003)(66946007)(76116006)(66446008)(64756008)(66556008)(66476007)(55016002)(53546011)(6506007)(186003)(86362001)(4326008)(107886003)(966005)(478600001)(54906003)(110136005)(316002)(7696005)(71200400001)(2906002)(33656002); 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charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-MS-Exchange-CrossTenant-Network-Message-Id: 11343486-b097-4fa2-2677-08d7b049a17b X-MS-Exchange-CrossTenant-originalarrivaltime: 13 Feb 2020 05:57:38.2499 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 5ae1af62-9505-4097-a69a-c1553ef7840e X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: uiSjRzsjy20PlyxR2++fKQta7WQ/BLgwPMMUuhZF+6v6fmPYFh/U0jiNFo0/W36Se1748FVI+DudbRIWpvjeww== X-MS-Exchange-Transport-CrossTenantHeadersStamped: MWHPR11MB1677 X-OriginatorOrg: cisco.com X-Outbound-SMTP-Client: 173.37.102.12, xch-rcd-002.cisco.com X-Outbound-Node: rcdn-core-9.cisco.com Archived-At: Subject: Re: [Lsr] WG Adoption Call for draft-li-lsr-ospfv3-srv6-extensions X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 13 Feb 2020 05:57:56 -0000 Hi Chris/Acee, The WG version of the draft has just been posted. It also includes the chan= ges for the comments received during the adoption as discussed on the maili= ng list. Thanks, Ketan (on behalf of co-authors) -----Original Message----- From: Christian Hopps =20 Sent: 12 February 2020 16:42 To: lsr@ietf.org Cc: Christian Hopps ; draft-li-lsr-ospfv3-srv6-extension= s@ietf.org; lsr-ads@ietf.org; Acee Lindem (acee) Subject: Re: [Lsr] WG Adoption Call for draft-li-lsr-ospfv3-srv6-extensions The document is adopted. Authors, please repost as draft-ietf-lsr-ospfv3-srv6-extensions. Thanks, Chris & Acee. > On Jan 23, 2020, at 3:24 PM, Christian Hopps wrote: >=20 > Hi LSR WG and Draft Authors, >=20 > The authors originally requested adoption back @ 105; however, some comme= nts were received and new version was produced. Moving forward... >=20 > This begins a 2 week WG adoption poll for the following draft: >=20 > https://datatracker.ietf.org/doc/draft-li-lsr-ospfv3-srv6-extensions/ >=20 > Please indicate your support or objection by Feb 6, 2020. >=20 > Authors, please respond indicating whether you are aware of any IPR that = applies to this draft. >=20 > Thanks, > Chris & Acee. > _______________________________________________ > Lsr mailing list > Lsr@ietf.org > https://www.ietf.org/mailman/listinfo/lsr >=20 From nobody Thu Feb 13 05:23:45 2020 Return-Path: X-Original-To: lsr@ietf.org Delivered-To: lsr@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id 7F73F1200EB; Thu, 13 Feb 2020 05:23:42 -0800 (PST) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: Christian Hopps via Datatracker To: X-Test-IDTracker: no X-IETF-IDTracker: 6.117.0 Auto-Submitted: auto-generated Precedence: bulk Cc: Christian Hopps , lsr-chairs@ietf.org, chopps@chopps.org, iesg-secretary@ietf.org, lsr@ietf.org Message-ID: <158160022251.20637.4856948534261119353.idtracker@ietfa.amsl.com> Date: Thu, 13 Feb 2020 05:23:42 -0800 Archived-At: Subject: [Lsr] Publication has been requested for draft-ietf-lsr-isis-invalid-tlv-01 X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 13 Feb 2020 13:23:43 -0000 Christian Hopps has requested publication of draft-ietf-lsr-isis-invalid-tlv-01 as Proposed Standard on behalf of the LSR working group. Please verify the document's state at https://datatracker.ietf.org/doc/draft-ietf-lsr-isis-invalid-tlv/ From nobody Fri Feb 14 08:29:32 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id A3FC912008A; Fri, 14 Feb 2020 08:29:29 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.997 X-Spam-Level: X-Spam-Status: No, score=-1.997 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_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id eQdDJ0W7m2tl; Fri, 14 Feb 2020 08:29:23 -0800 (PST) Received: from mail-qt1-x82c.google.com (mail-qt1-x82c.google.com [IPv6:2607:f8b0:4864:20::82c]) (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 6C62D1200E5; Fri, 14 Feb 2020 08:29:23 -0800 (PST) Received: by mail-qt1-x82c.google.com with SMTP id d5so7366045qto.0; Fri, 14 Feb 2020 08:29:23 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to; bh=+d4AqypyZiC/mRPzlhTmCcdPK/w/tFfBc/xsw0+LN10=; b=XDWduURo1TvfiBBsQY45wnjSsSeFTLPOur9I6/u1AIjShTYxqFRYPoJhI+LrgHRWHW BQNZttoLim5wxISBAA9/LEZQJsgV00X41apunAQs+PUsPSlM13PP6Dm0h1tTbIfg9cXZ 4owMv8ZHdW1sAE7LhRdX2W54AW90wsh4OEKBXkvGG96IKXCdBMOJ8d1ePDzIf7kjFIjU o4H6eV9QMSKUBefIUJIr2KB1aG4WnZiggtHvO+sDPVTfXjkw9Dme0RZC9x4ux64MIRkh gDj61rYbKwG6+9/9alT0/uSjECVnVOe7q1fYg2zBimBQkoLtxk/z3TVJekd7Ygp/yX1Q VV7w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to; bh=+d4AqypyZiC/mRPzlhTmCcdPK/w/tFfBc/xsw0+LN10=; b=LWXx6I9uGfD0GuTRbFNHYrqkr6QpcW/4iBWnm4NhXPNssfoLB2XlAOM+N2+O++ki6N 903cT/SsKK+tzIahmEuhzkzN54b7nqjuDFxJVnsFZ9I2qs1a1hNceAb0yiS4lQHlwYgk CoFOf53vhbNdsVLUwcvzHoS9HAEfJXt2ul8ymYHN1IVrA207XcwQKcMw1PSsaPsg9D4X L5orfAqk2hsTQcZhmeU0KKyWCJARgICWt3OT5OugyIYpuVeRGETDIXYROm3w6+U/GX5Y q19oShLax9aXN+ZhHFcivvWXCGZx3i1SJ2l91FRT6AzO69Y7c8po8ZSWmvicD3Q0Rjms 2p7w== X-Gm-Message-State: APjAAAW1M3T0Hp5U2kCo8QC5E05I2Ax8UioN6ulbQwkl+tdS1LlwWrL3 avSsUDk1d0GnqtRhUG93JnESqx57HnDjEJkAjv0= X-Google-Smtp-Source: APXvYqxoTSp4V7br4zd51auzcDuiJkKOXirWg7q+XKTxbBWuEXOx+zNfZP/LacKvMrDSElR3FYckHLW6tkYBapMgk1Q= X-Received: by 2002:ac8:1306:: with SMTP id e6mr3194067qtj.267.1581697762312; Fri, 14 Feb 2020 08:29:22 -0800 (PST) MIME-Version: 1.0 References: <122B138F-AA4F-4C7C-969C-755DF15F5744@chopps.org> <86b274ad-e26b-029b-a36f-01febc03027a@cisco.com> <14f7392b-0139-0e88-a40a-45dbfcfa9ab0@cisco.com> In-Reply-To: From: Chris Bowers Date: Fri, 14 Feb 2020 10:26:48 -0600 Message-ID: To: Peter Psenak , lsr@ietf.org, "Acee Lindem (acee)" , lsr-ads@ietf.org, Christian Hopps Content-Type: multipart/alternative; boundary="00000000000043ce9a059e8bb586" Archived-At: Subject: Re: [Lsr] WG Last Call draft-ietf-lsr-isis-srv6-extensions X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 14 Feb 2020 16:29:30 -0000 --00000000000043ce9a059e8bb586 Content-Type: text/plain; charset="UTF-8" All, I'm forwarding this question and subsequent response to the list because it looks like I accidentally sent it only to Peter before. Chris On Fri, Feb 7, 2020 at 4:15 PM Chris Bowers wrote: > Peter, > > Thanks for the clarification. > > Can you also clarify how a receiver should interpret a locator > advertisement that doesn't have a corresponding RFC7794 advertisement? > > Modifying the example below, suppose I receive a locator advertisement > from router R7 with locator = 7777::/64 and End-SID 7777::1, but R7 doesn't > originate an RFC7794 advertisement for 7777::/64. Can I conclude that > 7777::/64 is not Anycast, so it can be used as a Node-SID when constructing > TE paths as discussed below ? > > Thanks, > Chris > > On Wed, Feb 5, 2020 at 5:28 AM Peter Psenak wrote: > >> Hi Chris, >> >> On 04/02/2020 23:17, Chris Bowers wrote: >> > Peter, >> > >> > Suppose I receive a locator advertisement from router R7 with >> > locator = 7777::/64 and End-SID 7777::1. I would like to be able to >> use >> > End-SID 7777::1 as >> > a Node-SID when constructing traffic engineered paths. That is, I want >> > to know that >> > the person or system that configured R7 believes that 7777::/64 >> > is NOT owned by more than one router within the same routing domain. >> >> ##PP >> sure, if the A-bit is not set, you should be fine to pick the SID from a >> locator. Please see below why. >> >> > >> > Since we are going with Interpretation I) below, a prefix can be (a) a >> > Node Prefix, (b) an Anycast Prefix, >> > or (c) neither of them. >> >> ##PP >> above is correct in general. >> >> However, given that locator is non-/128, N-bit does not apply per >> RFC7794. So for a locator you only have (b) or (c) and you would only >> want to avoid (b) for what you want to do above. >> >> >> > If I receive an RFC7794 advertisement from R7 >> > for 7777::/64 with N=0, A=0, >> > I can only conclude that 7777::/64 is either (a) a Node Prefix or (c) >> > neither a Node Prefix nor an >> > Anycast Prefix. Using the N-flag for a non-/128 would allow us to >> > unambiguously indicate that >> > 7777::/64 is a Node Prefix, so we can use the associated End-SID >> 7777::1 >> > in a manner >> > consistent with the knowledge that 7777::/64 is NOT owned by more than >> > one router >> > within the same routing domain. >> > >> > One other small point relates to the statement below that "locators are >> > never /128". >> > I don't think it would be very useful to configure a /128 locator, >> since >> > it only has >> > space for one SRv6 SID. However, the current text of >> > draft-ietf-lsr-isis-srv6-extensions explicitly >> > allows the Loc-Size to be 1-128. >> >> ##PP >> agree, but I don't believe we need to put any special text to state the >> above, it's obvious. >> >> thanks, >> Peter >> > >> > Thanks, >> > Chris >> > >> > On Tue, Feb 4, 2020 at 2:44 AM Peter Psenak > > > wrote: >> > >> > Hi Chris, >> > >> > On 03/02/2020 14:39, Peter Psenak wrote: >> > >> I think a reasonable solution would be to remove the restriction >> > >> >> > >> on the N-flag to allow it to be used for non-/128 >> > prefixes/locators. This >> > >> >> > >> would allow the three possible prefix-SIDs states to be easily >> > represented. >> > > ##PP >> > > right, that could be a possibility, which would allow SRv6 >> locator to >> > > have the "node" property, as locators are never /128. >> > >> > do you have a use case, where the locator would need a N-flag? >> > >> > I can not really think of any, so unless we have one, we better not >> > define an N-flag for a non-/128 locator prefix. >> > >> > thanks, >> > Peter >> > >> > On Mon, Feb 3, 2020 at 7:39 AM Peter Psenak > > > wrote: >> > >> > Hi Chris, >> > >> > adding to what Les has said. >> > Please see inline (##PP) >> > >> > On 31/01/2020 21:10, Chris Bowers wrote: >> > > Peter and Les, >> > > >> > > It seems to me that for the Node Flag in RFC7794 and the proposed >> > > Anycast Flag >> > > >> > > in draft-ietf-lsr-isis-srv6-extensions-04, we are ultimately >> > concerned with >> > > >> > > how to identify IGP-Node Segments and IGP-Anycast Segments, as >> > defined >> > > in RFC8402, >> > > >> > > the Segment Routing Architecture document. >> > > >> > > If this is the case, then the following text from RFC8402 is very >> > relevant. >> > > >> > > ============ >> > > >> > > 3.2. IGP-Node Segment (Node-SID) >> > > >> > > An IGP Node-SID MUST NOT be associated with a prefix that is >> > owned by >> > > >> > > more than one router within the same routing domain.. >> > > >> > > 3.3. IGP-Anycast Segment (Anycast-SID) >> > > >> > > .... >> > > >> > > An IGP-Anycast segment MUST NOT reference a particular node. >> > > >> > > ..... >> > > >> > > ============ >> > > >> > > This text can be interpreted in two different ways. >> > > >> > > Interpretation I) >> > > >> > > A prefix-SID can have the following three possible states. >> > > >> > > Ia) Node-SID >> > > >> > > Ib) Anycast-SID >> > > >> > > Ic) neither Node-SID nor Anycast-SID >> > >> > ##PP >> > Prefix can either be Node Prefix, Anycast Prefix or neither of them. >> > >> > >> > > >> > > Interpretation II) >> > > >> > > A prefix-SID can have the following two possible states. >> > > >> > > IIa) Node-SID >> > > >> > > IIb) Anycast-SID >> > > >> > > If Interpretation I) is correct, then I think that the current >> > encodings in >> > > >> > > draft-ietf-lsr-isis-srv6-extensions-04 do not allow us >> > > >> > > to unambiguously identify a Node-SID for a non-/128 >> > > >> > > prefix/locator. For example, the End-SIDs within a /64 locator >> > with the >> > > A-flag set could >> > > >> > > either be Ia) a Node-SID >> > >> > ##PP >> > rfc7794 does not allow the N-flag to be set for non-/128 prefix, so >> > above is not possible for /64 locator at the moment. >> > >> > If the A-flag is set, it is an anycast locator. >> > >> > >> > >> > >or Ic) neither Node-SID nor Anycast-SID. >> > >> > ##PP >> > if the A-flag was not set for /64 locator, above would be correct, >> but >> > given that the A-flag is set, it is clearly just Anycast locator. >> > >> > > >> > > I think a reasonable solution would be to remove the restriction >> > > >> > > on the N-flag to allow it to be used for non-/128 >> > prefixes/locators. This >> > > >> > > would allow the three possible prefix-SIDs states to be easily >> > represented. >> > >> > ##PP >> > right, that could be a possibility, which would allow SRv6 locator >> to >> > have the "node" property, as locators are never /128. >> > >> > thanks, >> > Peter >> > >> > >> > > >> > > If Interpretation II) is correct, then I think that the current >> > > encodings in >> > > >> > > draft-ietf-lsr-isis-srv6-extensions-04 need clarification with >> > respect to >> > > >> > > how to interpret a /128 prefix/locator advertisement with N=0, >> > A=0.. We >> > > >> > > have to decide between interpreting the End-SIDs within the >> locator >> > > >> > > as either Node-SIDs or Anycast-SIDs, since there is no third >> option. >> > > >> > > I think that interpreting the End-SIDs as Anycast-SIDs in the >> > N=0, A=0 >> > > >> > > case is preferable because it preserves backwards compatibility. >> > > >> > > >> > > Thanks, >> > > >> > > Chris >> > > >> > > >> > > >> > > On Thu, Jan 30, 2020 at 4:02 AM Peter Psenak > > >> > > >> wrote: >> > > >> > > Hi Chris, >> > > >> > > please see inline (##PP) >> > > >> > > On 29/01/2020 17:25, Chris Bowers wrote: >> > > > I would like to proposed the following text to make >> section 6 >> > > more clear. >> > > > >> > > > Thanks, >> > > > Chris >> > > > >> > > > ==================== >> > > > >> > > > (existing text) >> > > > >> > > > >> > > > 6. Advertising Anycast Property >> > > > >> > > > Both prefixes and SRv6 Locators may be configured as >> > anycast >> > > and as >> > > > >> > > > such the same value can be advertised by multiple >> > routers. It is >> > > > >> > > > useful for other routers to know that the >> > advertisement is for an >> > > > >> > > > anycast identifier. >> > > > >> > > > A new flag in "Bit Values for Prefix Attribute Flags >> > Sub-TLV" >> > > > >> > > > registry [RFC7794] is defined to advertise the anycast >> > property: >> > > > >> > > > Bit #: 4 (Suggested - to be assigned by IANA) >> > > > >> > > > Name: Anycast Flag (A-flag) >> > > > >> > > > When the prefix/SRv6 locator is configured as >> anycast, >> > > the A-flag >> > > > >> > > > SHOULD be set. Otherwise, this flag MUST be clear. >> > > > >> > > > The A-flag MUST be preserved when leaked between >> levels. >> > > > >> > > > The A-flag and the N-flag MUST NOT both be set. >> > > > >> > > > ==== start insert new text ======= >> > > > >> > > > >> > > > Certain use cases require prefixes/locators that uniquely >> > belong >> > > to a node. >> > > > >> > > > Since prefixes/locators which are not /128 should not have >> > the N >> > > bit set, >> > > > >> > > > this node local uniqueness is decided based on A bit for >> > non-/128 >> > > prefixes. >> > > >> > > ##PP >> > > above does not seem correct. Above seems to imply that for >> > non-/128 >> > > prefix, A-bit is replacement of N-bit. >> > > >> > > A-bit applies to both /128 and non-/128 prefixes equally. >> > > >> > > Current draft clearly states what to do when both N a A bits >> > are set. >> > > >> > > >> > > >> > > > >> > > > When a prefix/locator iscategorized as anycast, it >> > does not >> > > uniquely >> > > > belong >> > > > >> > > > to a node and cannot be used for such use cases. The >> > rules >> > > below >> > > > specify >> > > > >> > > > how to determine whether or not a prefix/locator >> should be >> > > treated >> > > > as anycast >> > > > >> > > > in various situations. >> > > > >> > > > >> > > > [RFC7794] contains the following restriction on the >> > > interpretation of the N-flag. >> > > > >> > > > "If the flag is set and the prefix length is NOT a >> > host prefix >> > > > >> > > > (/32 for IPV4, /128 forIPv6), then the flag MUST be >> > ignored." >> > > > >> > > > The current document does NOT modify this restriction >> > on the >> > > interpretation of >> > > > >> > > > the N-flag imposed by [RFC7794]. >> > > >> > > ##PP >> > > I don't think above text is needed. And I don't think above >> is >> > > completely correct, as we define a new case in which the >> N-bit >> > > should be >> > > ignored (when A-bit is set). >> > > >> > > >> > > > >> > > > For a prefix/SRv6 Locator advertisement with a /128 >> > > prefix/locator, >> > > > >> > > > if both N-flag and A-flag are set, the receiving >> > router MUST >> > > treat the >> > > > >> > > > prefix advertisement as anycast. >> > > >> > > ##PP >> > > we have following text in the draft already: >> > > >> > > "If both N-flag and A-flag are set in the prefix/SRv6 Locator >> > > advertisement, the receiving routers MUST ignore the >> > N-flag." >> > > >> > > >> > > >> > > > >> > > > For a prefix/SRv6 Locator advertisement with a /128 >> > > prefix/locator, >> > > > >> > > > if the N-flag and A-flag are NOT set, the receiving >> > routers >> > > > >> > > > MUST treat the prefix advertisement as anycast.. >> > > >> > > ##PP >> > > I don't think above statement is correct. Why a node cannot >> > advertise a >> > > /128 prefix which is not an anycast one and does not have a >> > N-bit set? >> > > >> > > >> > > >> > > > This rule ensures the >> > > > >> > > > correct interpretation of a prefix advertisement >> > originated by >> > > > >> > > > a router that is not SRv6 capable and originates a >> legacy >> > > > >> > > > Prefix Attribute Flags Sub-TLV based on [RFC7794] >> alone. >> > > > >> > > > For a prefix/SRv6 Locator advertisement with a >> > prefix/locator >> > > that >> > > > >> > > > is NOT /128, the N-flag must be ignored, so the >> > setting of the >> > > > >> > > > A-flag determines the anycast treatment of the prefix >> > > advertisement. >> > > >> > > ##PP >> > > A-flag does that regardless of the length of the prefix. >> > > >> > > >> > > > >> > > > The Prefix Attribute Flags Sub-TLV can be carried in >> > the SRv6 >> > > > Locator TLV >> > > > >> > > > as well as the Prefix Reachability TLVs. When a >> router >> > > originates >> > > > >> > > > both the Prefix Reachability TLV and the SRv6 Locator >> > TLV for >> > > a given >> > > > >> > > > prefix, and the router is originating the Prefix >> Attribute >> > > Flags Sub-TLV >> > > > >> > > > in one of the TLVs, the router SHOULD advertise >> identical >> > > versions of the >> > > > >> > > > Prefix Attribute Flags Sub-TLV in both TLVs. >> > > >> > > ##PP >> > > Above seems a good suggestion. Will add it. >> > > >> > > > >> > > > >> > > > >> > > > If a router receives one Prefix Attribute Flags >> > Sub-TLV in the >> > > > >> > > > Prefix Reachability TLV and another in the SRv6 >> > Locator TLV, >> > > the router should >> > > > >> > > > use the prefix attribute flags received in the Prefix >> > > Reachability TLV. >> > > >> > > ##PP >> > > above contradicts what you suggest in the previous paragraph, >> > where you >> > > suggest we need to advertise with both prefix and locator, >> > and here you >> > > suggest we ignore what we received in the locator. >> > > >> > > Are you talking about the case where the content of the >> Prefix >> > > Attribute >> > > Flags Sub-TLV is different in prefix vs locator? >> > > > >> > > > >> > > > >> > > > If a router receives a Prefix Attribute Flags Sub-TLV >> > in the >> > > > >> > > > Prefix Reachability TLV but not in the SRv6 Locator >> > TLV, the >> > > router should >> > > > >> > > > use the prefix attribute flags received in the Prefix >> > > Reachability TLV. >> > > >> > > ##PP >> > > do we really need this? If the originator does the right >> > thing, then we >> > > don't have the problem. Cross referencing data between >> > different TLVs >> > > complicates the implementations. >> > > >> > > >> > > > >> > > > >> > > > >> > > > If a router receives a Prefix Attribute Flags Sub-TLV >> > in the >> > > > >> > > > SRv6 Locator TLV but not in the Prefix Reachability >> TLV, >> > > > >> > > > the router should use the prefix attribute flags >> > received in >> > > the SRv6 Locator TLV. >> > > >> > > ##PP >> > > same as above. >> > > >> > > thanks, >> > > Peter >> > > >> > > > >> > > > ==== end insert new text ========= >> > > > >> > > > The same prefix/SRv6 Locator can be advertised by >> multiple >> > > routers. >> > > > >> > > > If at least one of them sets the A-Flag in its >> > advertisement, the >> > > > >> > > > prefix/SRv6 Locator SHOULD be considered as anycast.. >> > > > >> > > > >> > > > >> > > > =================== >> > > > >> > > > >> > > > On Tue, Jan 21, 2020 at 6:15 PM Christian Hopps >> > > >> > > >> > > > >> > >>> wrote: >> > > > >> > > > This begins a 2 week WG Last Call, ending after Feb 4, >> > 2020, for >> > > > draft-ietf-lsr-isis-srv6-extensions >> > > > >> > > > >> > > >> > https://datatracker.ietf. >> .org/doc/draft-ietf-lsr-isis-srv6-extensions/ >> > > > >> > > >> > < >> https://datatracker.ietf.org/doc/draft-ietf-lsr-isis-srv6-extensions/> >> > > > >> > > > Authors please indicate if you aware of any other IPR >> > beyond >> > > what is >> > > > posted: >> > > > >> > > > https://datatracker.ietf.org/ipr/3796/ >> > > > >> > > > Thanks, >> > > > Chris & Acee. >> > > > _______________________________________________ >> > > > Lsr mailing list >> > > > Lsr@ietf.org > > > >> > > >> >> > > > https://www.ietf.org/mailman/listinfo/lsr >> > > > >> > > >> > >> >> --00000000000043ce9a059e8bb586 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
All,

I'm forwarding this= question and subsequent response to the list because it looks like I accid= entally sent it only to Peter before.

Chris

On = Fri, Feb 7, 2020 at 4:15 PM Chris Bowers <chrisbowers.ietf@gmail.com> wrote:=
Peter,

Thanks for the clarification.=C2=A0 =

Can you also clarify how a receiver should in= terpret a locator advertisement that doesn't have a corresponding RFC77= 94 advertisement?

Modifying the example below= ,=C2=A0 suppose I receive a locator advertisement from router R7 with locat= or =3D 7777::/64 and End-SID 7777::1, but R7 doesn't originate an RFC7794 advertisement for 7777::/64.=C2=A0 Can I conclude that 7777::/64 is= not Anycast, so it can be used as a Node-SID when constructing TE paths as= discussed below ?

Thanks,
Chris=C2=A0 <= br>

On Wed, Feb 5, 2020 at 5:28 AM Peter Psenak <ppsenak@cisco.com> wrote= :
Hi Chris,

On 04/02/2020 23:17, Chris Bowers wrote:
> Peter,
>
> Suppose I receive a locator advertisement from router R7 with
> locator =3D 7777::/64 and End-SID 7777::1.=C2=A0 I would like to be ab= le to use
> End-SID 7777::1 as
> a Node-SID when constructing traffic engineered paths.=C2=A0 That is, = I want
> to know that
> the person or system that configured R7 believes that 7777::/64
> is NOT owned by more than one router within the same routing domain.
##PP
sure, if the A-bit is not set, you should be fine to pick the SID from a locator. Please see below why.

>
> Since we are going with Interpretation I) below, a prefix can be (a) a=
> Node Prefix, (b) an Anycast Prefix,
> or (c) neither of them.=C2=A0

##PP
above is correct in general.

However, given that locator is non-/128, N-bit does not apply per
RFC7794. So for a locator you only have (b) or (c) and you would only
want to avoid (b) for what you want to do above.


> If I receive an RFC7794 advertisement from R7
> for 7777::/64 with N=3D0, A=3D0,
> I can only conclude that 7777::/64 is either (a) a Node Prefix or (c) =
> neither a Node Prefix nor an
> Anycast Prefix. Using the N-flag for a non-/128 would allow us to=C2= =A0
> unambiguously indicate that
> 7777::/64 is a Node Prefix, so we can use the associated End-SID 7777:= :1
> in a manner
> consistent with the knowledge that 7777::/64 is NOT owned by more than=
> one router
> within the same routing domain.
>
> One other small point relates to the statement below that "locato= rs are
> never /128".
> I don't think it would be very useful to configure a /128 locator,= since
> it only has
> space for one SRv6 SID.=C2=A0=C2=A0 However, the current text of
> draft-ietf-lsr-isis-srv6-extensions explicitly
> allows the Loc-Size to be 1-128.

##PP
agree, but I don't believe we need to put any special text to state the=
above, it's obvious.

thanks,
Peter
>
> Thanks,
> Chris
>
> On Tue, Feb 4, 2020 at 2:44 AM Peter Psenak <ppsenak@cisco.com
> <mailto:ppse= nak@cisco.com>> wrote:
>
>=C2=A0 =C2=A0 =C2=A0Hi Chris,
>
>=C2=A0 =C2=A0 =C2=A0On 03/02/2020 14:39, Peter Psenak wrote:
>=C2=A0 =C2=A0 =C2=A0 >> I think a reasonable solution would be to= remove the restriction
>=C2=A0 =C2=A0 =C2=A0 >>
>=C2=A0 =C2=A0 =C2=A0 >> on the N-flag to allow it to be used for = non-/128
>=C2=A0 =C2=A0 =C2=A0prefixes/locators.=C2=A0 This
>=C2=A0 =C2=A0 =C2=A0 >>
>=C2=A0 =C2=A0 =C2=A0 >> would allow the three possible prefix-SID= s states to be easily
>=C2=A0 =C2=A0 =C2=A0represented.
>=C2=A0 =C2=A0 =C2=A0 > ##PP
>=C2=A0 =C2=A0 =C2=A0 > right, that could be a possibility, which wou= ld allow SRv6 locator to
>=C2=A0 =C2=A0 =C2=A0 > have the "node" property, as locato= rs are never /128.
>
>=C2=A0 =C2=A0 =C2=A0do you have a use case, where the locator would nee= d a N-flag?
>
>=C2=A0 =C2=A0 =C2=A0I can not really think of any, so unless we have on= e, we better not
>=C2=A0 =C2=A0 =C2=A0define an N-flag for a non-/128 locator prefix.
>
>=C2=A0 =C2=A0 =C2=A0thanks,
>=C2=A0 =C2=A0 =C2=A0Peter
>
> On Mon, Feb 3, 2020 at 7:39 AM Peter Psenak <ppsenak@cisco.com
> <mailto:ppse= nak@cisco.com>> wrote:
>
>=C2=A0 =C2=A0 =C2=A0Hi Chris,
>
>=C2=A0 =C2=A0 =C2=A0adding to what Les has said.
>=C2=A0 =C2=A0 =C2=A0Please see inline (##PP)
>
>=C2=A0 =C2=A0 =C2=A0On 31/01/2020 21:10, Chris Bowers wrote:
>=C2=A0 =C2=A0 =C2=A0 > Peter and Les,
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 > It seems to me that for the Node Flag in RFC7= 794 and the proposed
>=C2=A0 =C2=A0 =C2=A0 > Anycast Flag
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 > in draft-ietf-lsr-isis-srv6-extensions-04, we= are ultimately
>=C2=A0 =C2=A0 =C2=A0concerned with
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 > how to identify IGP-Node Segments and IGP-Any= cast Segments, as
>=C2=A0 =C2=A0 =C2=A0defined
>=C2=A0 =C2=A0 =C2=A0 > in RFC8402,
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 > the Segment Routing Architecture document. >=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 > If this is the case, then the following text = from RFC8402 is very
>=C2=A0 =C2=A0 =C2=A0relevant.
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 > =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 > 3.2.=C2=A0 IGP-Node Segment (Node-SID)
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=C2=A0 An IGP Node-SID MUST NOT b= e associated with a prefix that is
>=C2=A0 =C2=A0 =C2=A0owned by
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=C2=A0 more than one router withi= n the same routing domain..
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 > 3.3.=C2=A0 IGP-Anycast Segment (Anycast-SID)<= br> >=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=C2=A0 ....
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=C2=A0 An IGP-Anycast segment MUS= T NOT reference a particular node.
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=C2=A0 .....
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 > =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 > This text can be interpreted in two different= ways.
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 > Interpretation I)
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 > A prefix-SID can have the following three pos= sible states.
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 > Ia) Node-SID
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 > Ib) Anycast-SID
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 > Ic) neither Node-SID nor Anycast-SID
>
>=C2=A0 =C2=A0 =C2=A0##PP
>=C2=A0 =C2=A0 =C2=A0Prefix can either be Node Prefix, Anycast Prefix or= neither of them.
>
>
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 > Interpretation II)
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 > A prefix-SID can have the following two possi= ble states.
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 > IIa) Node-SID
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 > IIb) Anycast-SID
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 > If Interpretation I) is correct, then I think= that the current
>=C2=A0 =C2=A0 =C2=A0encodings in
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 > draft-ietf-lsr-isis-srv6-extensions-04 do not= allow us
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 > to unambiguously identify a Node-SID for a no= n-/128
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 > prefix/locator.=C2=A0 For example, the End-SI= Ds within a /64 locator
>=C2=A0 =C2=A0 =C2=A0with the
>=C2=A0 =C2=A0 =C2=A0 > A-flag set could
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 > either be Ia) a Node-SID
>
>=C2=A0 =C2=A0 =C2=A0##PP
>=C2=A0 =C2=A0 =C2=A0rfc7794 does not allow the N-flag to be set for non= -/128 prefix, so
>=C2=A0 =C2=A0 =C2=A0above is not possible for /64 locator at the moment= .
>
>=C2=A0 =C2=A0 =C2=A0If the A-flag is set, it is an anycast locator.
>
>
>
>=C2=A0 =C2=A0 =C2=A0 >or Ic) neither Node-SID nor Anycast-SID.
>
>=C2=A0 =C2=A0 =C2=A0##PP
>=C2=A0 =C2=A0 =C2=A0if the A-flag was not set for /64 locator, above wo= uld be correct, but
>=C2=A0 =C2=A0 =C2=A0given that the A-flag is set, it is clearly just An= ycast locator.
>
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 > I think a reasonable solution would be to rem= ove the restriction
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 > on the N-flag to allow it to be used for non-= /128
>=C2=A0 =C2=A0 =C2=A0prefixes/locators.=C2=A0 This
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 > would allow the three possible prefix-SIDs st= ates to be easily
>=C2=A0 =C2=A0 =C2=A0represented.
>
>=C2=A0 =C2=A0 =C2=A0##PP
>=C2=A0 =C2=A0 =C2=A0right, that could be a possibility, which would all= ow SRv6 locator to
>=C2=A0 =C2=A0 =C2=A0have the "node" property, as locators are= never /128.
>
>=C2=A0 =C2=A0 =C2=A0thanks,
>=C2=A0 =C2=A0 =C2=A0Peter
>
>
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 > If Interpretation II) is correct, then I thin= k that the current
>=C2=A0 =C2=A0 =C2=A0 > encodings in
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 > draft-ietf-lsr-isis-srv6-extensions-04 need c= larification with
>=C2=A0 =C2=A0 =C2=A0respect to
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 > how to interpret a /128 prefix/locator advert= isement with N=3D0,
>=C2=A0 =C2=A0 =C2=A0A=3D0.. We
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 > have to decide between interpreting the End-S= IDs within the locator
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 > as either Node-SIDs or Anycast-SIDs, since th= ere is no third option.
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 > I think that interpreting the End-SIDs as Any= cast-SIDs in the
>=C2=A0 =C2=A0 =C2=A0N=3D0, A=3D0
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 > case is preferable because it preserves backw= ards compatibility.
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 > Thanks,
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 > Chris
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 > On Thu, Jan 30, 2020 at 4:02 AM Peter Psenak = <ppsenak@cisco.co= m
>=C2=A0 =C2=A0 =C2=A0<mailto:ppsenak@cisco.com>
>=C2=A0 =C2=A0 =C2=A0 > <mailto:ppsenak@cisco.com <mailto:ppsenak@cisco.com>>> wrote:<= br> >=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0Hi Chris,
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0please see inline (##PP) >=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0On 29/01/2020 17:25, Chris= Bowers wrote:
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > I would like to prop= osed the following text to make section 6
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0more clear.
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > Thanks,
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > Chris
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > =3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0(existin= g text)
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > 6.=C2=A0 Advertising= Anycast Property
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=C2=A0 B= oth prefixes and SRv6 Locators may be configured as
>=C2=A0 =C2=A0 =C2=A0anycast
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0and as
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=C2=A0 s= uch the same value can be advertised by multiple
>=C2=A0 =C2=A0 =C2=A0routers.=C2=A0 It is
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=C2=A0 u= seful for other routers to know that the
>=C2=A0 =C2=A0 =C2=A0advertisement is for an
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=C2=A0 a= nycast identifier.
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=C2=A0 A= new flag in "Bit Values for Prefix Attribute Flags
>=C2=A0 =C2=A0 =C2=A0Sub-TLV"
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=C2=A0 r= egistry [RFC7794] is defined to advertise the anycast
>=C2=A0 =C2=A0 =C2=A0property:
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0 Bit #: 4 (Suggested - to be assigned by IANA)
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0 Name: Anycast Flag (A-flag)
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0 When the prefix/SRv6 locator is configured as anyc= ast,
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0the A-flag
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0 SHOULD be set. Otherwise, this flag MUST be clear.=
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=C2=A0 T= he A-flag MUST be preserved when leaked between levels.
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=C2=A0 T= he A-flag and the N-flag MUST NOT both be set.
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > =3D=3D=3D=3D start i= nsert new text =3D=3D=3D=3D=3D=3D=3D
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > Certain use cases re= quire prefixes/locators that uniquely
>=C2=A0 =C2=A0 =C2=A0belong
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0to a node.
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > Since prefixes/locat= ors which are not /128 should not have
>=C2=A0 =C2=A0 =C2=A0the N
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0bit set,
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > this node local uniq= ueness is decided based on A bit for
>=C2=A0 =C2=A0 =C2=A0non-/128
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0prefixes.
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0##PP
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0above does not seem correc= t. Above seems to imply that for
>=C2=A0 =C2=A0 =C2=A0non-/128
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0prefix, A-bit is replaceme= nt of N-bit.
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0A-bit applies to both /128= and non-/128 prefixes equally.
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0Current draft clearly stat= es what to do when both N a A bits
>=C2=A0 =C2=A0 =C2=A0are set.
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=C2=A0 W= hen a prefix/locator iscategorized as anycast, it
>=C2=A0 =C2=A0 =C2=A0does not
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0uniquely
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > belong
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=C2=A0 t= o a node and cannot be used for such use cases.=C2=A0 The
>=C2=A0 =C2=A0 =C2=A0rules
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0below
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > specify
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=C2=A0 h= ow to determine whether or not a prefix/locator should be
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0treated
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > as anycast
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=C2=A0 i= n various situations.
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=C2=A0 [= RFC7794] contains the following restriction on the
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0interpretation of the N-fl= ag.
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0&= quot;If the flag is set and the prefix length is NOT a
>=C2=A0 =C2=A0 =C2=A0host prefix
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=C2=A0= =C2=A0=C2=A0(/32 for IPV4, /128 forIPv6), then the flag MUST be
>=C2=A0 =C2=A0 =C2=A0ignored."
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=C2=A0 T= he current document does NOT modify this restriction
>=C2=A0 =C2=A0 =C2=A0on the
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0interpretation of
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=C2=A0= =C2=A0the N-flag imposed by [RFC7794].
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0##PP
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0I don't think above te= xt is needed. And I don't think above is
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0completely correct, as we = define a new case in which the N-bit
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0should be
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0ignored (when A-bit is set= ).
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=C2=A0= =C2=A0For a prefix/SRv6 Locator advertisement with a /128
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0prefix/locator,
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=C2=A0 i= f both N-flag and A-flag are set, the receiving
>=C2=A0 =C2=A0 =C2=A0router MUST
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0treat the
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=C2=A0= =C2=A0prefix advertisement as anycast.
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0##PP
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0we have following text in = the draft already:
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0"If both N-flag and A= -flag are set in the prefix/SRv6 Locator
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 advertiseme= nt, the receiving routers MUST ignore the
>=C2=A0 =C2=A0 =C2=A0N-flag."
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=C2=A0 F= or a prefix/SRv6 Locator advertisement with a /128
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0prefix/locator,
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=C2=A0 i= f the N-flag and A-flag are NOT set, the receiving
>=C2=A0 =C2=A0 =C2=A0routers
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=C2=A0= =C2=A0MUST treat the prefix advertisement as anycast..
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0##PP
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0I don't think above st= atement is correct. Why a node cannot
>=C2=A0 =C2=A0 =C2=A0advertise a
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0/128 prefix which is not a= n anycast one and does not have a
>=C2=A0 =C2=A0 =C2=A0N-bit set?
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > This rule ensures th= e
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=C2=A0= =C2=A0correct interpretation of a prefix advertisement
>=C2=A0 =C2=A0 =C2=A0originated by
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=C2=A0= =C2=A0a router that is not SRv6 capable and originates a legacy
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=C2=A0= =C2=A0Prefix Attribute Flags Sub-TLV based on [RFC7794] alone.
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=C2=A0 F= or a prefix/SRv6 Locator advertisement with a
>=C2=A0 =C2=A0 =C2=A0prefix/locator
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0that
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=C2=A0 i= s NOT /128, the N-flag must be ignored, so the
>=C2=A0 =C2=A0 =C2=A0setting of the
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=C2=A0= =C2=A0A-flag determines the anycast treatment of the prefix
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0advertisement.
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0##PP
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0A-flag does that regardles= s of the length of the prefix.
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=C2=A0= =C2=A0The Prefix Attribute Flags Sub-TLV can be carried in
>=C2=A0 =C2=A0 =C2=A0the SRv6
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > Locator TLV
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0a= s well as the Prefix Reachability TLVs.=C2=A0 When a router
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0originates
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=C2=A0= =C2=A0both the Prefix Reachability TLV and the SRv6 Locator
>=C2=A0 =C2=A0 =C2=A0TLV for
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0a given
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=C2=A0= =C2=A0prefix, and the router is originating the Prefix Attribute
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0Flags Sub-TLV
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=C2=A0 i= n one of the TLVs, the router SHOULD advertise identical
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0versions of the
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=C2=A0= =C2=A0Prefix Attribute Flags Sub-TLV in both TLVs.
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0##PP
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0Above seems a good suggest= ion. Will add it.
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=C2=A0 I= f a router receives one Prefix Attribute Flags
>=C2=A0 =C2=A0 =C2=A0Sub-TLV in the
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=C2=A0= =C2=A0Prefix Reachability TLV and another in the SRv6
>=C2=A0 =C2=A0 =C2=A0Locator TLV,
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0the router should
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=C2=A0= =C2=A0use the prefix attribute flags received in the Prefix
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0Reachability TLV.
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0##PP
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0above contradicts what you= suggest in the previous paragraph,
>=C2=A0 =C2=A0 =C2=A0where you
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0suggest we need to adverti= se with both prefix and locator,
>=C2=A0 =C2=A0 =C2=A0and here you
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0suggest we ignore what we = received in the locator.
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0Are you talking about the = case where the content of the Prefix
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0Attribute
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0Flags Sub-TLV is different= in prefix vs locator?
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=C2=A0 I= f a router receives a Prefix Attribute Flags Sub-TLV
>=C2=A0 =C2=A0 =C2=A0in the
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=C2=A0= =C2=A0Prefix Reachability TLV but not in the SRv6 Locator
>=C2=A0 =C2=A0 =C2=A0TLV, the
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0router should
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=C2=A0= =C2=A0use the prefix attribute flags received in the Prefix
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0Reachability TLV.
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0##PP
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0do we really need this? If= the originator does the right
>=C2=A0 =C2=A0 =C2=A0thing, then we
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0don't have the problem= . Cross referencing data between
>=C2=A0 =C2=A0 =C2=A0different TLVs
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0complicates the implementa= tions.
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=C2=A0 I= f a router receives a Prefix Attribute Flags Sub-TLV
>=C2=A0 =C2=A0 =C2=A0in the
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=C2=A0= =C2=A0SRv6 Locator TLV but not in the Prefix Reachability TLV,
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0t= he router should use the prefix attribute flags
>=C2=A0 =C2=A0 =C2=A0received in
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0the SRv6 Locator TLV.
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0##PP
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0same as above.
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0thanks,
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0Peter
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > =3D=3D=3D=3D end ins= ert new text =3D=3D=3D=3D=3D=3D=3D=3D=3D
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=C2=A0 T= he same prefix/SRv6 Locator can be advertised by multiple
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0routers.
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=C2=A0 I= f at least one of them sets the A-Flag in its
>=C2=A0 =C2=A0 =C2=A0advertisement, the
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0=C2=A0 p= refix/SRv6 Locator SHOULD be considered as anycast..
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > =3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > On Tue, Jan 21, 2020= at 6:15 PM Christian Hopps
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0<chopps@chopps.org <mailto:chopps@chopps.org> >=C2=A0 =C2=A0 =C2=A0<mailto:chopps@chopps.org <mailto:chopps@chopps.org>>
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > <mailto:chopps@chopps.org <m= ailto:chopps@chopps.= org>
>=C2=A0 =C2=A0 =C2=A0<mailto:chopps@chopps.org <mailto:chopps@chopps.org>>>> wrote: >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0T= his begins a 2 week WG Last Call, ending after Feb 4,
>=C2=A0 =C2=A0 =C2=A02020, for
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0d= raft-ietf-lsr-isis-srv6-extensions
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0https://datatracker.ietf..org/doc/draft-ietf-ls= r-isis-srv6-extensions/
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0
>=C2=A0 =C2=A0 =C2=A0 =C2=A0<https://datatracker.ietf.org/doc/draft-ietf-lsr-isis-srv6-extensions/>
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0A= uthors please indicate if you aware of any other IPR
>=C2=A0 =C2=A0 =C2=A0beyond
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0what is
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0p= osted:
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > https:/= /datatracker.ietf.org/ipr/3796/
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0T= hanks,
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0C= hris & Acee.
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0_= ______________________________________________
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0L= sr mailing list
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > Lsr@ietf.org <mailto:Lsr@ietf.org> <mailto:Lsr@ietf.org
>=C2=A0 =C2=A0 =C2=A0<mailto:Lsr@ietf.org>> <mailto:Lsr@ietf.org <mailto:Lsr@ietf.org>
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0<mailto:Lsr@ietf.org <mailto:Lsr@ietf.org>>>
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 > http= s://www.ietf.org/mailman/listinfo/lsr
>=C2=A0 =C2=A0 =C2=A0 >=C2=A0 =C2=A0 =C2=A0 >
>=C2=A0 =C2=A0 =C2=A0 >
>

--00000000000043ce9a059e8bb586-- From nobody Fri Feb 14 08:30:50 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 1128E120115; Fri, 14 Feb 2020 08:30:48 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.997 X-Spam-Level: X-Spam-Status: No, score=-1.997 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_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id KgLpp-xtaUrW; Fri, 14 Feb 2020 08:30:43 -0800 (PST) Received: from mail-qk1-x72c.google.com (mail-qk1-x72c.google.com [IPv6:2607:f8b0:4864:20::72c]) (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 59AA5120108; Fri, 14 Feb 2020 08:30:43 -0800 (PST) Received: by mail-qk1-x72c.google.com with SMTP id z19so9747872qkj.5; Fri, 14 Feb 2020 08:30:43 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to; bh=Kpr2W1quhgQRi1kfcfxoXgByDQZ+TjHT6QGyBm2XlLs=; b=o8Cit5Bn+aD0r0hh6xgTamdYhRwlv7ET7OFL1LOaaalmqQ6/MWK4mq7ef0ZZ/ERbv1 hSpCt+ZB3yzhmNc/uQBw+2uDNFimrmGm5qFJMUwA+15Lj2kA+T97PermFKk2X7l1arXT HznIm++f7/0TSZ6FlqgB5QSO1kzm+QdVEJgsAqbyNJAQOyzpMLG7tgOFoQZSAK8cpwXH wwvUiwU34h/H9IN95r7QtiZ/xxpEGMjJfqrHckm93WY2b2GR1Qxx/tZ1otzotbxB5Qo6 fTzB8OlivbzgExVkvx/FZX0c3mhGKIaiRBtO9tkmZvzEjArJuB1EQd9c73Zt18/UToV3 xgBw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to; bh=Kpr2W1quhgQRi1kfcfxoXgByDQZ+TjHT6QGyBm2XlLs=; b=XMn7OgGHTsBOA3O/FK3UEwuN+1l77KqAeFMVM3cQwUTTh/APLOECsE2CwWQUPglFO3 xmTdOD0Ri7be2l2olpVjiS3jMMlgu41F9knZjltXdOM8eTy1Ol4wd3JwbW+d7h+Fsjh+ d/Gu4vGpULp87kzl6us/rbOdD72whF/Rhx4U7eX5lm7LBDzH6VC4E5YFZ4Mvca03+lCs Sl4j0Kba0B/oPAe22i+GT6pizxrqd+EHbd0BF6SUoGrcmKEcujPEtt01+iI5DZq/oMY2 PbCi2fJsmvgXfx7WGzcBjG0MJ0cYr3t0jBBNmFHtotm9m4ugChFTyYl6me2tPZnmto9q RrEg== X-Gm-Message-State: APjAAAWICtfrBezZ6t+EQI0UPuST1bWla9IBwiOqxNz/CBEP3V9A135T wbgO79IJ9BbmEFpG16WKhMC6wmvUSIjZfOTqUnY= X-Google-Smtp-Source: APXvYqy8cdKlZEMMpNmjUZJ/TQn6KCIIzEzcRwAJsFFYbj4ZD2pfWGOI38b4sMAN0Jj4OD2vDVpexrEIJayVHBfOA6E= X-Received: by 2002:a37:e210:: with SMTP id g16mr3291773qki.413.1581697842331; Fri, 14 Feb 2020 08:30:42 -0800 (PST) MIME-Version: 1.0 References: <122B138F-AA4F-4C7C-969C-755DF15F5744@chopps.org> <86b274ad-e26b-029b-a36f-01febc03027a@cisco.com> <14f7392b-0139-0e88-a40a-45dbfcfa9ab0@cisco.com> In-Reply-To: From: Chris Bowers Date: Fri, 14 Feb 2020 10:28:07 -0600 Message-ID: To: Peter Psenak , lsr@ietf.org, lsr-ads@ietf.org, "Acee Lindem (acee)" , Christian Hopps Content-Type: multipart/alternative; boundary="00000000000008c6ec059e8bba76" Archived-At: Subject: Re: [Lsr] WG Last Call draft-ietf-lsr-isis-srv6-extensions X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 14 Feb 2020 16:30:48 -0000 --00000000000008c6ec059e8bba76 Content-Type: text/plain; charset="UTF-8" All, I'm forwarding this question and subsequent response to the list because it looks like I accidentally sent it only to Peter before. Chris On Sat, Feb 8, 2020 at 3:25 AM Peter Psenak wrote: > Hi Chris, > > On 07/02/2020 23:15, Chris Bowers wrote: > > Peter, > > > > Thanks for the clarification. > > > > Can you also clarify how a receiver should interpret a locator > > advertisement that doesn't have a corresponding RFC7794 advertisement? > > > > Modifying the example below, suppose I receive a locator advertisement > > from router R7 with locator = 7777::/64 and End-SID 7777::1, but R7 > > doesn't originate an RFC7794 advertisement for 7777::/64. Can I > > conclude that 7777::/64 is not Anycast, so it can be used as a Node-SID > > when constructing TE paths as discussed below ? > > yes. That's the only reasonable choice. > > Implementation may also check if the same locator is not advertised by > some other node in addition. But I would not mandate that in the spec. > > thanks, > Peter > > > > Thanks, > > Chris > > > > On Wed, Feb 5, 2020 at 5:28 AM Peter Psenak > > wrote: > > > > Hi Chris, > > > > On 04/02/2020 23:17, Chris Bowers wrote: > > > Peter, > > > > > > Suppose I receive a locator advertisement from router R7 with > > > locator = 7777::/64 and End-SID 7777::1. I would like to be able > > to use > > > End-SID 7777::1 as > > > a Node-SID when constructing traffic engineered paths. That is, > > I want > > > to know that > > > the person or system that configured R7 believes that 7777::/64 > > > is NOT owned by more than one router within the same routing > domain. > > > > ##PP > > sure, if the A-bit is not set, you should be fine to pick the SID > > from a > > locator. Please see below why. > > > > > > > > Since we are going with Interpretation I) below, a prefix can be > > (a) a > > > Node Prefix, (b) an Anycast Prefix, > > > or (c) neither of them. > > > > ##PP > > above is correct in general. > > > > However, given that locator is non-/128, N-bit does not apply per > > RFC7794. So for a locator you only have (b) or (c) and you would only > > want to avoid (b) for what you want to do above. > > > > > > > If I receive an RFC7794 advertisement from R7 > > > for 7777::/64 with N=0, A=0, > > > I can only conclude that 7777::/64 is either (a) a Node Prefix or > > (c) > > > neither a Node Prefix nor an > > > Anycast Prefix. Using the N-flag for a non-/128 would allow us to > > > unambiguously indicate that > > > 7777::/64 is a Node Prefix, so we can use the associated End-SID > > 7777::1 > > > in a manner > > > consistent with the knowledge that 7777::/64 is NOT owned by more > > than > > > one router > > > within the same routing domain. > > > > > > One other small point relates to the statement below that > > "locators are > > > never /128". > > > I don't think it would be very useful to configure a /128 > > locator, since > > > it only has > > > space for one SRv6 SID. However, the current text of > > > draft-ietf-lsr-isis-srv6-extensions explicitly > > > allows the Loc-Size to be 1-128. > > > > ##PP > > agree, but I don't believe we need to put any special text to state > the > > above, it's obvious. > > > > thanks, > > Peter > > > > > > Thanks, > > > Chris > > > > > > On Tue, Feb 4, 2020 at 2:44 AM Peter Psenak > > > > >> wrote: > > > > > > Hi Chris, > > > > > > On 03/02/2020 14:39, Peter Psenak wrote: > > > >> I think a reasonable solution would be to remove the > > restriction > > > >> > > > >> on the N-flag to allow it to be used for non-/128 > > > prefixes/locators. This > > > >> > > > >> would allow the three possible prefix-SIDs states to be > > easily > > > represented. > > > > ##PP > > > > right, that could be a possibility, which would allow SRv6 > > locator to > > > > have the "node" property, as locators are never /128. > > > > > > do you have a use case, where the locator would need a N-flag? > > > > > > I can not really think of any, so unless we have one, we > > better not > > > define an N-flag for a non-/128 locator prefix. > > > > > > thanks, > > > Peter > > > > > > On Mon, Feb 3, 2020 at 7:39 AM Peter Psenak > > > > >> wrote: > > > > > > Hi Chris, > > > > > > adding to what Les has said. > > > Please see inline (##PP) > > > > > > On 31/01/2020 21:10, Chris Bowers wrote: > > > > Peter and Les, > > > > > > > > It seems to me that for the Node Flag in RFC7794 and the > > proposed > > > > Anycast Flag > > > > > > > > in draft-ietf-lsr-isis-srv6-extensions-04, we are > ultimately > > > concerned with > > > > > > > > how to identify IGP-Node Segments and IGP-Anycast > Segments, as > > > defined > > > > in RFC8402, > > > > > > > > the Segment Routing Architecture document. > > > > > > > > If this is the case, then the following text from RFC8402 > > is very > > > relevant. > > > > > > > > ============ > > > > > > > > 3.2. IGP-Node Segment (Node-SID) > > > > > > > > An IGP Node-SID MUST NOT be associated with a prefix > > that is > > > owned by > > > > > > > > more than one router within the same routing domain.. > > > > > > > > 3.3. IGP-Anycast Segment (Anycast-SID) > > > > > > > > .... > > > > > > > > An IGP-Anycast segment MUST NOT reference a particular > > node. > > > > > > > > ..... > > > > > > > > ============ > > > > > > > > This text can be interpreted in two different ways. > > > > > > > > Interpretation I) > > > > > > > > A prefix-SID can have the following three possible states. > > > > > > > > Ia) Node-SID > > > > > > > > Ib) Anycast-SID > > > > > > > > Ic) neither Node-SID nor Anycast-SID > > > > > > ##PP > > > Prefix can either be Node Prefix, Anycast Prefix or neither > > of them. > > > > > > > > > > > > > > Interpretation II) > > > > > > > > A prefix-SID can have the following two possible states. > > > > > > > > IIa) Node-SID > > > > > > > > IIb) Anycast-SID > > > > > > > > If Interpretation I) is correct, then I think that the > current > > > encodings in > > > > > > > > draft-ietf-lsr-isis-srv6-extensions-04 do not allow us > > > > > > > > to unambiguously identify a Node-SID for a non-/128 > > > > > > > > prefix/locator. For example, the End-SIDs within a /64 > > locator > > > with the > > > > A-flag set could > > > > > > > > either be Ia) a Node-SID > > > > > > ##PP > > > rfc7794 does not allow the N-flag to be set for non-/128 > > prefix, so > > > above is not possible for /64 locator at the moment. > > > > > > If the A-flag is set, it is an anycast locator. > > > > > > > > > > > > >or Ic) neither Node-SID nor Anycast-SID. > > > > > > ##PP > > > if the A-flag was not set for /64 locator, above would be > > correct, but > > > given that the A-flag is set, it is clearly just Anycast > locator. > > > > > > > > > > > I think a reasonable solution would be to remove the > > restriction > > > > > > > > on the N-flag to allow it to be used for non-/128 > > > prefixes/locators. This > > > > > > > > would allow the three possible prefix-SIDs states to be > easily > > > represented. > > > > > > ##PP > > > right, that could be a possibility, which would allow SRv6 > > locator to > > > have the "node" property, as locators are never /128. > > > > > > thanks, > > > Peter > > > > > > > > > > > > > > If Interpretation II) is correct, then I think that the > > current > > > > encodings in > > > > > > > > draft-ietf-lsr-isis-srv6-extensions-04 need clarification > with > > > respect to > > > > > > > > how to interpret a /128 prefix/locator advertisement with > N=0, > > > A=0.. We > > > > > > > > have to decide between interpreting the End-SIDs within > > the locator > > > > > > > > as either Node-SIDs or Anycast-SIDs, since there is no > > third option. > > > > > > > > I think that interpreting the End-SIDs as Anycast-SIDs in > the > > > N=0, A=0 > > > > > > > > case is preferable because it preserves backwards > > compatibility. > > > > > > > > > > > > Thanks, > > > > > > > > Chris > > > > > > > > > > > > > > > > On Thu, Jan 30, 2020 at 4:02 AM Peter Psenak > > > > > > > > > > > > >>> wrote: > > > > > > > > Hi Chris, > > > > > > > > please see inline (##PP) > > > > > > > > On 29/01/2020 17:25, Chris Bowers wrote: > > > > > I would like to proposed the following text to make > > section 6 > > > > more clear. > > > > > > > > > > Thanks, > > > > > Chris > > > > > > > > > > ==================== > > > > > > > > > > (existing text) > > > > > > > > > > > > > > > 6. Advertising Anycast Property > > > > > > > > > > Both prefixes and SRv6 Locators may be > > configured as > > > anycast > > > > and as > > > > > > > > > > such the same value can be advertised by > multiple > > > routers. It is > > > > > > > > > > useful for other routers to know that the > > > advertisement is for an > > > > > > > > > > anycast identifier. > > > > > > > > > > A new flag in "Bit Values for Prefix Attribute > > Flags > > > Sub-TLV" > > > > > > > > > > registry [RFC7794] is defined to advertise the > > anycast > > > property: > > > > > > > > > > Bit #: 4 (Suggested - to be assigned by > IANA) > > > > > > > > > > Name: Anycast Flag (A-flag) > > > > > > > > > > When the prefix/SRv6 locator is configured > > as anycast, > > > > the A-flag > > > > > > > > > > SHOULD be set. Otherwise, this flag MUST be > > clear. > > > > > > > > > > The A-flag MUST be preserved when leaked > > between levels. > > > > > > > > > > The A-flag and the N-flag MUST NOT both be set. > > > > > > > > > > ==== start insert new text ======= > > > > > > > > > > > > > > > Certain use cases require prefixes/locators that > > uniquely > > > belong > > > > to a node. > > > > > > > > > > Since prefixes/locators which are not /128 should > > not have > > > the N > > > > bit set, > > > > > > > > > > this node local uniqueness is decided based on A > > bit for > > > non-/128 > > > > prefixes. > > > > > > > > ##PP > > > > above does not seem correct. Above seems to imply that > for > > > non-/128 > > > > prefix, A-bit is replacement of N-bit. > > > > > > > > A-bit applies to both /128 and non-/128 prefixes > equally. > > > > > > > > Current draft clearly states what to do when both N a > > A bits > > > are set. > > > > > > > > > > > > > > > > > > > > > > When a prefix/locator iscategorized as anycast, > it > > > does not > > > > uniquely > > > > > belong > > > > > > > > > > to a node and cannot be used for such use > > cases. The > > > rules > > > > below > > > > > specify > > > > > > > > > > how to determine whether or not a > > prefix/locator should be > > > > treated > > > > > as anycast > > > > > > > > > > in various situations. > > > > > > > > > > > > > > > [RFC7794] contains the following restriction on > the > > > > interpretation of the N-flag. > > > > > > > > > > "If the flag is set and the prefix length is > NOT a > > > host prefix > > > > > > > > > > (/32 for IPV4, /128 forIPv6), then the flag > > MUST be > > > ignored." > > > > > > > > > > The current document does NOT modify this > > restriction > > > on the > > > > interpretation of > > > > > > > > > > the N-flag imposed by [RFC7794]. > > > > > > > > ##PP > > > > I don't think above text is needed. And I don't think > > above is > > > > completely correct, as we define a new case in which > > the N-bit > > > > should be > > > > ignored (when A-bit is set). > > > > > > > > > > > > > > > > > > For a prefix/SRv6 Locator advertisement with a > /128 > > > > prefix/locator, > > > > > > > > > > if both N-flag and A-flag are set, the receiving > > > router MUST > > > > treat the > > > > > > > > > > prefix advertisement as anycast. > > > > > > > > ##PP > > > > we have following text in the draft already: > > > > > > > > "If both N-flag and A-flag are set in the prefix/SRv6 > > Locator > > > > advertisement, the receiving routers MUST ignore > the > > > N-flag." > > > > > > > > > > > > > > > > > > > > > > For a prefix/SRv6 Locator advertisement with a > /128 > > > > prefix/locator, > > > > > > > > > > if the N-flag and A-flag are NOT set, the > receiving > > > routers > > > > > > > > > > MUST treat the prefix advertisement as anycast.. > > > > > > > > ##PP > > > > I don't think above statement is correct. Why a node > > cannot > > > advertise a > > > > /128 prefix which is not an anycast one and does not > > have a > > > N-bit set? > > > > > > > > > > > > > > > > > This rule ensures the > > > > > > > > > > correct interpretation of a prefix advertisement > > > originated by > > > > > > > > > > a router that is not SRv6 capable and > > originates a legacy > > > > > > > > > > Prefix Attribute Flags Sub-TLV based on > > [RFC7794] alone. > > > > > > > > > > For a prefix/SRv6 Locator advertisement with a > > > prefix/locator > > > > that > > > > > > > > > > is NOT /128, the N-flag must be ignored, so the > > > setting of the > > > > > > > > > > A-flag determines the anycast treatment of the > > prefix > > > > advertisement. > > > > > > > > ##PP > > > > A-flag does that regardless of the length of the > prefix. > > > > > > > > > > > > > > > > > > The Prefix Attribute Flags Sub-TLV can be > > carried in > > > the SRv6 > > > > > Locator TLV > > > > > > > > > > as well as the Prefix Reachability TLVs. When > > a router > > > > originates > > > > > > > > > > both the Prefix Reachability TLV and the SRv6 > > Locator > > > TLV for > > > > a given > > > > > > > > > > prefix, and the router is originating the > > Prefix Attribute > > > > Flags Sub-TLV > > > > > > > > > > in one of the TLVs, the router SHOULD advertise > > identical > > > > versions of the > > > > > > > > > > Prefix Attribute Flags Sub-TLV in both TLVs. > > > > > > > > ##PP > > > > Above seems a good suggestion. Will add it. > > > > > > > > > > > > > > > > > > > > > > > > If a router receives one Prefix Attribute Flags > > > Sub-TLV in the > > > > > > > > > > Prefix Reachability TLV and another in the SRv6 > > > Locator TLV, > > > > the router should > > > > > > > > > > use the prefix attribute flags received in the > > Prefix > > > > Reachability TLV. > > > > > > > > ##PP > > > > above contradicts what you suggest in the previous > > paragraph, > > > where you > > > > suggest we need to advertise with both prefix and > locator, > > > and here you > > > > suggest we ignore what we received in the locator. > > > > > > > > Are you talking about the case where the content of > > the Prefix > > > > Attribute > > > > Flags Sub-TLV is different in prefix vs locator? > > > > > > > > > > > > > > > > > > > > If a router receives a Prefix Attribute Flags > > Sub-TLV > > > in the > > > > > > > > > > Prefix Reachability TLV but not in the SRv6 > Locator > > > TLV, the > > > > router should > > > > > > > > > > use the prefix attribute flags received in the > > Prefix > > > > Reachability TLV. > > > > > > > > ##PP > > > > do we really need this? If the originator does the > right > > > thing, then we > > > > don't have the problem. Cross referencing data between > > > different TLVs > > > > complicates the implementations. > > > > > > > > > > > > > > > > > > > > > > > > > > > > If a router receives a Prefix Attribute Flags > > Sub-TLV > > > in the > > > > > > > > > > SRv6 Locator TLV but not in the Prefix > > Reachability TLV, > > > > > > > > > > the router should use the prefix attribute flags > > > received in > > > > the SRv6 Locator TLV. > > > > > > > > ##PP > > > > same as above. > > > > > > > > thanks, > > > > Peter > > > > > > > > > > > > > > ==== end insert new text ========= > > > > > > > > > > The same prefix/SRv6 Locator can be advertised > > by multiple > > > > routers. > > > > > > > > > > If at least one of them sets the A-Flag in its > > > advertisement, the > > > > > > > > > > prefix/SRv6 Locator SHOULD be considered as > > anycast.. > > > > > > > > > > > > > > > > > > > > =================== > > > > > > > > > > > > > > > On Tue, Jan 21, 2020 at 6:15 PM Christian Hopps > > > > > > > > > > > > >> > > > > > > > > > > > > > >>>> wrote: > > > > > > > > > > This begins a 2 week WG Last Call, ending after > > Feb 4, > > > 2020, for > > > > > draft-ietf-lsr-isis-srv6-extensions > > > > > > > > > > > > > > > > > > > https://datatracker.ietf. > .org/doc/draft-ietf-lsr-isis-srv6-extensions/ > > > > > > > > > > > > > > < > https://datatracker.ietf.org/doc/draft-ietf-lsr-isis-srv6-extensions/> > > > > > > > > > > Authors please indicate if you aware of any > > other IPR > > > beyond > > > > what is > > > > > posted: > > > > > > > > > > https://datatracker.ietf.org/ipr/3796/ > > > > > > > > > > Thanks, > > > > > Chris & Acee. > > > > > _______________________________________________ > > > > > Lsr mailing list > > > > > Lsr@ietf.org > > > > > > > >> > > > > > > > > > > >>> > > > > > https://www.ietf.org/mailman/listinfo/lsr > > > > > > > > > > > > > > > > --00000000000008c6ec059e8bba76 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: base64 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To: lsr@ietf.org, lsr-ads@ietf.org, "Acee Lindem (acee)" , Christian Hopps , Peter Psenak Content-Type: multipart/alternative; boundary="0000000000005ea942059e8c185e" Archived-At: Subject: [Lsr] feedback on draft-ietf-lsr-isis-srv6-extensions-04 related to algorithms X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 14 Feb 2020 16:57:17 -0000 --0000000000005ea942059e8c185e Content-Type: text/plain; charset="UTF-8" All, The current text from Section 5 (below) doesn't specify if locators associated with algorithms with values 1-126 SHOULD or SHOULD NOT be advertised in Prefix Reachability TLVs. In particular, it seems like the text should specify the expected behavior for locators associated with algorithm 1 (Strict SPF). Locators associated with Flexible Algorithms [I-D.ietf-lsr-flex-algo] SHOULD NOT be advertised in Prefix Reachability TLVs (236 or 237). Locators associated with algorithm 0 (for all supported topologies) SHOULD be advertised in a Prefix Reachability TLV (236 or 237) so that legacy routers (i.e., routers which do NOT support SRv6) will install a forwarding entry for algorithm 0 SRv6 traffic. Thanks, Chris --0000000000005ea942059e8c185e Content-Type: text/html; charset="UTF-8"
All,

The current text from Section 5 (below) doesn't specify if locators associated with algorithms with values 1-126 SHOULD or SHOULD NOT be advertised in Prefix Reachability TLVs. In particular, it seems like the text should specify the expected behavior for locators associated with algorithm 1 (Strict SPF).

   Locators associated with Flexible Algorithms [I-D.ietf-lsr-flex-algo]
   SHOULD NOT be advertised in Prefix Reachability TLVs (236 or 237).
   Locators associated with algorithm 0 (for all supported topologies)
   SHOULD be advertised in a Prefix Reachability TLV (236 or 237) so
   that legacy routers (i.e., routers which do NOT support SRv6) will
   install a forwarding entry for algorithm 0 SRv6 traffic.

Thanks,
Chris

--0000000000005ea942059e8c185e-- From nobody Fri Feb 14 09:03:19 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 6E4691208E9; Fri, 14 Feb 2020 09:03:17 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -14.502 X-Spam-Level: X-Spam-Status: No, score=-14.502 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, RCVD_IN_DNSWL_HI=-5, 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 MsGGe38zOJQp; Fri, 14 Feb 2020 09:03:16 -0800 (PST) Received: from aer-iport-4.cisco.com (aer-iport-4.cisco.com [173.38.203.54]) (using TLSv1.2 with cipher DHE-RSA-SEED-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 909FF1208EF; Fri, 14 Feb 2020 09:03:02 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=923; q=dns/txt; s=iport; t=1581699782; x=1582909382; h=subject:to:references:from:message-id:date:mime-version: in-reply-to:content-transfer-encoding; bh=qejMMa1dfWX4zUozP/LTHUFEzDJbGVb8k69BSCcU72g=; b=ZeqyBPn1DbHYESBtWbTSF1qDSKkFcfH71W9dAOBssyZdMJ7qzlM3nzbN PMyQ5wHXJdCREefnUNA5EqxqAN2AQP6pAg86qqtreEx1LtXKi9Xy6hvsP DW/ECOafnLhKTb/WvTe0BhMpcPLqU79WJYorbeNh/OI+uWplOM4FQrqUL M=; X-IronPort-AV: E=Sophos;i="5.70,441,1574121600"; d="scan'208";a="23272970" Received: from aer-iport-nat.cisco.com (HELO aer-core-1.cisco.com) ([173.38.203.22]) by aer-iport-4.cisco.com with ESMTP/TLS/DHE-RSA-SEED-SHA; 14 Feb 2020 17:03:01 +0000 Received: from [10.60.140.52] (ams-ppsenak-nitro3.cisco.com [10.60.140.52]) by aer-core-1.cisco.com (8.15.2/8.15.2) with ESMTP id 01EH30BU027979; Fri, 14 Feb 2020 17:03:00 GMT To: Chris Bowers , lsr@ietf.org, lsr-ads@ietf.org, "Acee Lindem (acee)" , Christian Hopps References: From: Peter Psenak Message-ID: <49c240b6-9155-2e28-d0d8-f615e15a21b8@cisco.com> Date: Fri, 14 Feb 2020 18:03:00 +0100 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:60.0) Gecko/20100101 Thunderbird/60.7.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-Outbound-SMTP-Client: 10.60.140.52, ams-ppsenak-nitro3.cisco.com X-Outbound-Node: aer-core-1.cisco.com Archived-At: Subject: Re: [Lsr] feedback on draft-ietf-lsr-isis-srv6-extensions-04 related to algorithms X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 14 Feb 2020 17:03:18 -0000 Hi Chris, On 14/02/2020 17:54, Chris Bowers wrote: > All, > > The current text from Section 5 (below) doesn't specify if locators > associated with algorithms with values 1-126 SHOULD or SHOULD NOT be > advertised in Prefix Reachability TLVs. In particular, it seems like the > text should specify the expected behavior for locators associated with > algorithm 1 (Strict SPF). sure, will add the text for algo 1. thanks, Peter > > Locators associated with Flexible Algorithms [I-D.ietf-lsr-flex-algo] > SHOULD NOT be advertised in Prefix Reachability TLVs (236 or 237). > Locators associated with algorithm 0 (for all supported topologies) > SHOULD be advertised in a Prefix Reachability TLV (236 or 237) so > that legacy routers (i.e., routers which do NOT support SRv6) will > install a forwarding entry for algorithm 0 SRv6 traffic. > > Thanks, > Chris > From nobody Mon Feb 17 18:33:00 2020 Return-Path: X-Original-To: lsr@ietf.org Delivered-To: lsr@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id 66DF41200E5; Mon, 17 Feb 2020 05:21:53 -0800 (PST) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: internet-drafts@ietf.org To: Cc: lsr@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 6.117.0 Auto-Submitted: auto-generated Precedence: bulk Reply-To: lsr@ietf.org Message-ID: <158194571334.17945.877378761062777952@ietfa.amsl.com> Date: Mon, 17 Feb 2020 05:21:53 -0800 Archived-At: Subject: [Lsr] I-D Action: draft-ietf-lsr-isis-srv6-extensions-05.txt X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 17 Feb 2020 13:21:53 -0000 A New Internet-Draft is available from the on-line Internet-Drafts directories. This draft is a work item of the Link State Routing WG of the IETF. Title : IS-IS Extension to Support Segment Routing over IPv6 Dataplane Authors : Peter Psenak Clarence Filsfils Ahmed Bashandy Bruno Decraene Zhibo Hu Filename : draft-ietf-lsr-isis-srv6-extensions-05.txt Pages : 25 Date : 2020-02-17 Abstract: Segment Routing (SR) allows for a flexible definition of end-to-end paths by encoding paths as sequences of topological sub-paths, called "segments". Segment routing architecture can be implemented over an MPLS data plane as well as an IPv6 data plane. This draft describes the IS-IS extensions required to support Segment Routing over an IPv6 data plane. The IETF datatracker status page for this draft is: https://datatracker.ietf.org/doc/draft-ietf-lsr-isis-srv6-extensions/ There are also htmlized versions available at: https://tools.ietf.org/html/draft-ietf-lsr-isis-srv6-extensions-05 https://datatracker.ietf.org/doc/html/draft-ietf-lsr-isis-srv6-extensions-05 A diff from the previous version is available at: https://www.ietf.org/rfcdiff?url2=draft-ietf-lsr-isis-srv6-extensions-05 Please note that it may take a couple of minutes from the time of submission until the htmlized version and diff are available at tools.ietf.org. Internet-Drafts are also available by anonymous FTP at: ftp://ftp.ietf.org/internet-drafts/ From nobody Mon Feb 17 18:33:15 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id DAC151200FB for ; Mon, 17 Feb 2020 05:25:05 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -14.502 X-Spam-Level: X-Spam-Status: No, score=-14.502 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIMWL_WL_MED=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, RCVD_IN_DNSWL_HI=-5, 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 h_ZezfE2espP for ; Mon, 17 Feb 2020 05:25:04 -0800 (PST) Received: from aer-iport-1.cisco.com (aer-iport-1.cisco.com [173.38.203.51]) (using TLSv1.2 with cipher DHE-RSA-SEED-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id BAD28120108 for ; Mon, 17 Feb 2020 05:25:03 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=2077; q=dns/txt; s=iport; t=1581945903; x=1583155503; h=subject:to:references:from:message-id:date:mime-version: in-reply-to:content-transfer-encoding; bh=Hp1cwNmez9AoCvNX4LXEkjyxN6dE8tgy2AS3M2aiu4E=; b=UUq+dX/AhyH8MJsnq4iC1rOCpvrNplw7+rurCl9X5ux1do5Wj6Eb1wDL S4U5WbeHMwjQ2vCLHUbpTvI2QIXNY0TSxLy4nfeIgB2GdpBnwbz3bs4Ot I5yg6pLGRACeHgmQfzrbjl3szVSTuPkjMxZDmnEXu5luS8IqLFvANYSdy o=; X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: =?us-ascii?q?A0AzBgANk0pe/xbLJq1mHgELHIUQVSA?= =?us-ascii?q?SKoQUiQOIH5s6CQEBAQ4YDQoEAQGEQAKCJTgTAgMNAQEFAQEBAgEFBG2FNwy?= =?us-ascii?q?FZwEBAQMBASEVNhsLEgYCAiYCAiciDhMGAgEBgyIBgnsPqnZ1gTKEOQIOQUC?= =?us-ascii?q?DRoE+gQ4qjD6BQT+BEAEngmw+gmQBAQIBARiCFoJDgl4El0qYNIJEgk+Efo8?= =?us-ascii?q?ABhyCSXuHG4QjjBiXWZJpgWkiKoEuMxoIGxUaIYJsCUcYDZckhUBAAzCPIAE?= =?us-ascii?q?B?= X-IronPort-AV: E=Sophos;i="5.70,452,1574121600"; d="scan'208";a="23422918" Received: from aer-iport-nat.cisco.com (HELO aer-core-2.cisco.com) ([173.38.203.22]) by aer-iport-1.cisco.com with ESMTP/TLS/DHE-RSA-SEED-SHA; 17 Feb 2020 13:25:01 +0000 Received: from [10.147.24.17] ([10.147.24.17]) by aer-core-2.cisco.com (8.15.2/8.15.2) with ESMTP id 01HDP1vF008657 for ; Mon, 17 Feb 2020 13:25:01 GMT To: lsr@ietf.org References: <158194571334.17945.877378761062777952@ietfa.amsl.com> From: Peter Psenak Message-ID: <634414e7-91d9-e400-468d-55b53fed0c9c@cisco.com> Date: Mon, 17 Feb 2020 14:25:01 +0100 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:60.0) Gecko/20100101 Thunderbird/60.7.0 MIME-Version: 1.0 In-Reply-To: <158194571334.17945.877378761062777952@ietfa.amsl.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-Outbound-SMTP-Client: 10.147.24.17, [10.147.24.17] X-Outbound-Node: aer-core-2.cisco.com Archived-At: Subject: Re: [Lsr] I-D Action: draft-ietf-lsr-isis-srv6-extensions-05.txt X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 17 Feb 2020 13:25:06 -0000 Hi, this version incorporates comments received from Bruno and Chris during the draft's WG LC. thanks, Peter On 17/02/2020 14:21, internet-drafts@ietf.org wrote: > > A New Internet-Draft is available from the on-line Internet-Drafts directories. > This draft is a work item of the Link State Routing WG of the IETF. > > Title : IS-IS Extension to Support Segment Routing over IPv6 Dataplane > Authors : Peter Psenak > Clarence Filsfils > Ahmed Bashandy > Bruno Decraene > Zhibo Hu > Filename : draft-ietf-lsr-isis-srv6-extensions-05.txt > Pages : 25 > Date : 2020-02-17 > > Abstract: > Segment Routing (SR) allows for a flexible definition of end-to-end > paths by encoding paths as sequences of topological sub-paths, called > "segments". Segment routing architecture can be implemented over an > MPLS data plane as well as an IPv6 data plane. This draft describes > the IS-IS extensions required to support Segment Routing over an IPv6 > data plane. > > > > The IETF datatracker status page for this draft is: > https://datatracker.ietf.org/doc/draft-ietf-lsr-isis-srv6-extensions/ > > There are also htmlized versions available at: > https://tools.ietf.org/html/draft-ietf-lsr-isis-srv6-extensions-05 > https://datatracker.ietf.org/doc/html/draft-ietf-lsr-isis-srv6-extensions-05 > > A diff from the previous version is available at: > https://www.ietf.org/rfcdiff?url2=draft-ietf-lsr-isis-srv6-extensions-05 > > > Please note that it may take a couple of minutes from the time of submission > until the htmlized version and diff are available at tools.ietf.org. > > Internet-Drafts are also available by anonymous FTP at: > ftp://ftp.ietf.org/internet-drafts/ > > _______________________________________________ > Lsr mailing list > Lsr@ietf.org > https://www.ietf.org/mailman/listinfo/lsr > > From nobody Tue Feb 18 18:25:57 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id CCE8312088E for ; 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charset="us-ascii" Content-Transfer-Encoding: quoted-printable Two recent drafts advocate for the use of faster LSP flooding speeds in IS-= IS: https://datatracker.ietf.org/doc/draft-decraene-lsr-isis-flooding-speed/ https://datatracker.ietf.org/doc/draft-ginsberg-lsr-isis-flooding-scale/ There is strong agreement on two key points: 1)Modern networks require much faster flooding speeds than are commonly in = use today 2)To deploy faster flooding speeds safely some form of flow control is need= ed The key point of contention between the two drafts is how flow control shou= ld be implemented. https://datatracker.ietf.org/doc/draft-decraene-lsr-isis-flooding-speed/ ad= vocates for a receiver based flow control where the receiver advertises in = hellos the parameters which indicate the rate/burst size which the receiver= is capable of supporting on the interface. Senders are required to limit t= he rate of LSP transmission on that interface in accordance with the values= advertised by the receiver. https://datatracker.ietf.org/doc/draft-ginsberg-lsr-isis-flooding-scale/ a= dvocates for a transmit based flow control where the transmitter monitors t= he number of unacknowledged LSPs sent on each interface and implements a ba= ckoff algorithm to slow the rate of sending LSPs based on the length of the= per interface unacknowledged queue. While other differences between the two drafts exist, it is fair to say tha= t if agreement could be reached on the form of flow control then it is lik= ely other issues could be resolved easily. This email starts the discussion regarding the flow control issue. --_000_MW3PR11MB46191E81D5B22B454D8184A4C1100MW3PR11MB4619namp_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Two recent drafts advocate for the use of faster LSP= flooding speeds in IS-IS:

 

https://datatra= cker.ietf.org/doc/draft-decraene-lsr-isis-flooding-speed/

https://datatra= cker.ietf.org/doc/draft-ginsberg-lsr-isis-flooding-scale/

 

There is strong agreement on two key points:

 

1)Modern networks require much faster flooding speed= s than are commonly in use today

 

2)To deploy faster flooding speeds safely some form = of flow control is needed

 

The key point of contention between the two drafts i= s how flow control should be implemented.

 

https://datatra= cker.ietf.org/doc/draft-decraene-lsr-isis-flooding-speed/ advoca= tes for a receiver based flow control where the receiver advertises in hellos the parameters which indicate the = rate/burst size which the receiver is capable of supporting on the interfac= e. Senders are required to limit the rate of LSP transmission on that inter= face in accordance with the values advertised by the receiver.

 

https://datatra= cker.ietf.org/doc/draft-ginsberg-lsr-isis-flooding-scale/  = advocates for a transmit based flow control where the transmitter monitors the number of unacknowledged LSPs sent on e= ach interface and implements a backoff algorithm to slow the rate of sendin= g LSPs based on the length of the per interface unacknowledged queue.<= /o:p>

 

While other differences between the two drafts exist= , it is fair to say that if agreement could be reached on the form of flow = control  then it is likely other issues could be resolved easily.=

 

This email starts the discussion regarding the flow = control issue.

 

 

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Wed, 19 Feb 2020 02:31:59 +0000 From: "Les Ginsberg (ginsberg)" To: "lsr@ietf.org" Thread-Topic: Flow Control Discussion for IS-IS Flooding Speed Thread-Index: AdXmy57fbkJZPBB7TgK3RmmTteJ+KgAAHZag Date: Wed, 19 Feb 2020 02:31:59 +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=ginsberg@cisco.com; x-originating-ip: [128.107.241.166] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: c3d74862-9991-4425-ed03-08d7b4e3e575 x-ms-traffictypediagnostic: MW3PR11MB4761: x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:9508; x-forefront-prvs: 0318501FAE x-forefront-antispam-report: SFV:NSPM; SFS:(10009020)(4636009)(136003)(346002)(39860400002)(376002)(366004)(396003)(189003)(199004)(66476007)(66946007)(64756008)(66556008)(66446008)(52536014)(2940100002)(5660300002)(966005)(71200400001)(9686003)(7696005)(2906002)(186003)(6506007)(26005)(55016002)(76116006)(53546011)(6916009)(66574012)(33656002)(8936002)(86362001)(81166006)(316002)(8676002)(81156014)(478600001); 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boundary="_000_MW3PR11MB461942C752F9CCB0A6E6C1BFC1100MW3PR11MB4619namp_" MIME-Version: 1.0 X-MS-Exchange-CrossTenant-Network-Message-Id: c3d74862-9991-4425-ed03-08d7b4e3e575 X-MS-Exchange-CrossTenant-originalarrivaltime: 19 Feb 2020 02:31:59.6043 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 5ae1af62-9505-4097-a69a-c1553ef7840e X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: X35qlZjUlWZd+3bKcrWHHo6H5nE4aggLaPPAuda0JCLT/aLxha6PkJmlGrMXqSxTzsb2oGAkdfOQsIpqudhmww== X-MS-Exchange-Transport-CrossTenantHeadersStamped: MW3PR11MB4761 X-OriginatorOrg: cisco.com X-Outbound-SMTP-Client: 173.36.7.15, xch-aln-005.cisco.com X-Outbound-Node: rcdn-core-4.cisco.com Archived-At: Subject: Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 19 Feb 2020 02:32:32 -0000 --_000_MW3PR11MB461942C752F9CCB0A6E6C1BFC1100MW3PR11MB4619namp_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Base protocol operation of the Update process tracks the flooding of LSPs/interface and guarantees timer-based retransmission on P2P interfaces until an acknowledgment is received. Using this base protocol mechanism in combination with exponential backoff = of the retransmission timer provides flow control in the event of temporary overlo= ad of the receiver. This mechanism works without protocol extensions, is dynamic, operates independent of the reason for delayed acknowledgment (dropped packets, CPU overload), and does not require additional signaling during the overloaded period. This is consistent with the recommendations in RFC 4222 (OSPF). Receiver-based flow control (as proposed in https://datatracker.ietf.org/do= c/draft-decraene-lsr-isis-flooding-speed/ ) requires protocol extensions and introduces additional signaling during periods of high load. The asserted reason for this is to optimize throughpu= t - but there is no evidence that it will achieve this goal. Mention has been made to TCP-like flow control mechanisms as a model - whic= h are indeed receiver based. However, there are significant differences betwe= en TCP sessions and IGP flooding. TCP consists of a single session between two endpoints. Resources (primarily buffer space) for this session are typically allocated in the control plane and current usage is easily measurable. IGP flooding is point-to-multi-point, resources to support IGP flooding involve both control plane queues and dataplane queues, both of which are typically not per interface - nor even dedicated to a particular protocol instance. What input is required to optimize receiver-based flow control is= not fully specified. https://datatracker.ietf.org/doc/draft-decraene-lsr-isis-flooding-speed/ su= ggests (Section 5) that the values to be advertised: "use a formula based on an off line tests of the overall LSPDU processing speed for a particular set of hardware and the number of interfaces configured for IS-IS" implying that the advertised value is intentionally not dynamic. As such, it could just as easily be configured on the transmit side and not require additional signaling. As a static value, it would necessarily be somewhat conservative as it has to account for the worst case under the current configuration - which means it needs to consider concurrent use of the CPU and dataplane by all protocols/features which are enabled on a router - not= all of whose use is likely to be synchronized with peak IS-IS flooding load. Unless a good case can be made as to why transmit-based flow control is not= a good fit and why receiver-based flow control is demonstrably better, it seems unnecessary to extend the protocol. Les From: Lsr On Behalf Of Les Ginsberg (ginsberg) Sent: Tuesday, February 18, 2020 6:25 PM To: lsr@ietf.org Subject: [Lsr] Flow Control Discussion for IS-IS Flooding Speed Two recent drafts advocate for the use of faster LSP flooding speeds in IS-= IS: https://datatracker.ietf.org/doc/draft-decraene-lsr-isis-flooding-speed/ https://datatracker.ietf.org/doc/draft-ginsberg-lsr-isis-flooding-scale/ There is strong agreement on two key points: 1)Modern networks require much faster flooding speeds than are commonly in = use today 2)To deploy faster flooding speeds safely some form of flow control is need= ed The key point of contention between the two drafts is how flow control shou= ld be implemented. https://datatracker.ietf.org/doc/draft-decraene-lsr-isis-flooding-speed/ ad= vocates for a receiver based flow control where the receiver advertises in = hellos the parameters which indicate the rate/burst size which the receiver= is capable of supporting on the interface. Senders are required to limit t= he rate of LSP transmission on that interface in accordance with the values= advertised by the receiver. https://datatracker.ietf.org/doc/draft-ginsberg-lsr-isis-flooding-scale/ a= dvocates for a transmit based flow control where the transmitter monitors t= he number of unacknowledged LSPs sent on each interface and implements a ba= ckoff algorithm to slow the rate of sending LSPs based on the length of the= per interface unacknowledged queue. While other differences between the two drafts exist, it is fair to say tha= t if agreement could be reached on the form of flow control then it is lik= ely other issues could be resolved easily. This email starts the discussion regarding the flow control issue. --_000_MW3PR11MB461942C752F9CCB0A6E6C1BFC1100MW3PR11MB4619namp_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Base protocol operation of the Update process tracks= the flooding of

LSPs/interface and guarantees timer-based retransmis= sion on P2P interfaces

until an acknowledgment is received.

Using this base protocol mechanism in combination wi= th exponential backoff of the

retransmission timer provides flow control in the ev= ent of temporary overload

of the receiver.

 

This mechanism works without protocol extensions, is= dynamic, operates

independent of the reason for delayed acknowledgment= (dropped packets, CPU

overload), and does not require additional signaling= during the overloaded

period.

This is consistent with the recommendations in RFC 4= 222 (OSPF).

Receiver-based flow control (as proposed in https://datatracker.ietf.org/doc/draft-decraene-lsr-isis-flooding-speed/ )

requires protocol extensions and introduces addition= al signaling during

periods of high load. The asserted reason for this i= s to optimize throughput -

but there is no evidence that it will achieve this g= oal.

Mention has been made to TCP-like flow control mecha= nisms as a model - which

are indeed receiver based. However, there are signif= icant differences between

TCP sessions and IGP flooding.

TCP consists of a single session between two endpoin= ts. Resources

(primarily buffer space) for this session are typica= lly allocated in the

control plane and current usage is easily measurable= .

IGP flooding is point-to-multi-point, resources to s= upport IGP flooding

involve both control plane queues and dataplane queu= es, both of which are

typically not per interface - nor even dedicated to = a particular protocol

instance. What input is required to optimize receive= r-based flow control is not fully specified.

https://datatracker.ietf.org/doc/draft-dec= raene-lsr-isis-flooding-speed/ suggests (Section 5) that the values

to be advertised:

"use a formula based on an off line tests of

   the overall LSPDU processing speed for = a particular set of hardware

   and the number of interfaces configured= for IS-IS"

implying that the advertised value is intentionally = not dynamic. As such,

it could just as easily be configured on the transmi= t side and not require

additional signaling. As a static value, it would ne= cessarily be somewhat

conservative as it has to account for the worst case= under the current

configuration - which means it needs to consider con= current use of the CPU

and dataplane by all protocols/features which are en= abled on a router - not all of whose

use is likely to be synchronized with peak IS-IS flo= oding load.

Unless a good case can be made as to why transmit-ba= sed flow control is not a good

fit and why receiver-based flow control is demonstra= bly better, it seems

unnecessary to extend the protocol.

 

    Les

 

 

From: Lsr <lsr-bounces@ietf.org> On = Behalf Of Les Ginsberg (ginsberg)
Sent: Tuesday, February 18, 2020 6:25 PM
To: lsr@ietf.org
Subject: [Lsr] Flow Control Discussion for IS-IS Flooding Speed=

 

Two recent drafts advocate for the use of faster LSP= flooding speeds in IS-IS:

 

https://datatracker.ietf.org/doc/draft-dec= raene-lsr-isis-flooding-speed/

https://datatracker.ietf.org/doc/draft-gin= sberg-lsr-isis-flooding-scale/

 

There is strong agreement on two key points:

 

1)Modern networks require much faster flooding speed= s than are commonly in use today

 

2)To deploy faster flooding speeds safely some form = of flow control is needed

 

The key point of contention between the two drafts i= s how flow control should be implemented.

 

https://datatracker.ietf.org/doc/draft-dec= raene-lsr-isis-flooding-speed/ advocates for a receiver based flow cont= rol where the receiver advertises in hellos the parameters which indicate the rate/burst size which the receive= r is capable of supporting on the interface. Senders are required to limit = the rate of LSP transmission on that interface in accordance with the value= s advertised by the receiver.

 

https://datatracker.ietf.org/doc/draft-gin= sberg-lsr-isis-flooding-scale/  advocates for a transmit based flo= w control where the transmitter monitors the number of unacknowledged LSPs sent on each interface and implements a = backoff algorithm to slow the rate of sending LSPs based on the length of t= he per interface unacknowledged queue.

 

While other differences between the two drafts exist= , it is fair to say that if agreement could be reached on the form of flow = control  then it is likely other issues could be resolved easily.=

 

This email starts the discussion regarding the flow = control issue.

 

 

--_000_MW3PR11MB461942C752F9CCB0A6E6C1BFC1100MW3PR11MB4619namp_-- From nobody Tue Feb 18 19:09:51 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 9F52812089A for ; Tue, 18 Feb 2020 19:09:49 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.998 X-Spam-Level: X-Spam-Status: No, score=-1.998 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_HELO_NONE=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 vFDacaXGehwk for ; Tue, 18 Feb 2020 19:09:47 -0800 (PST) Received: from mail-pg1-x536.google.com (mail-pg1-x536.google.com [IPv6:2607:f8b0:4864:20::536]) (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 A4E4112006E for ; Tue, 18 Feb 2020 19:09:47 -0800 (PST) Received: by mail-pg1-x536.google.com with SMTP id d9so11986529pgu.3 for ; Tue, 18 Feb 2020 19:09:47 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:message-id:mime-version:subject:date:in-reply-to:cc:to :references; bh=zjTNSq8uYK7loSsgahtV83NHjAJMHK5aR8Bne1dTHcs=; b=Pe5XAy9VTf9cs5GymUCEmHpLYLyI41YcQfufbS5LTjJa1weN+LwGRgZj4i02cB71sY yCYc+i+aFXNO9Ijn6whpBPuG1FjGrvztCKEnhfhkeLro6W9/yaXqFoVB9TqsxUNKSOp2 4lNx1/XN4TFJysr6YumnBUAYRg2o6l0Ze3Kgugvdipx1/BSVuctOyBZbnJYjn9eQqdpX M/9kWhbhWAHcUvrasLYAea+Mu0uveXjOYdt+JGV1vzmxtQY/z498tptdjgyBMlIjNto1 xqC8jM5vv3Z/+s5wrHjqfag5II53aYgMaM4g+C9LHcXPjB1Nuu4LK2W3fU8tkwVw3fBp AHyg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:message-id:mime-version:subject:date :in-reply-to:cc:to:references; bh=zjTNSq8uYK7loSsgahtV83NHjAJMHK5aR8Bne1dTHcs=; b=jgJGntgMiMJAkoMdj0TnxPdBYL38CRSVR7Rup4+8DkVvjvh0TlUJljbCmLz7yb+CkU AmiE8simp/4X9NJtcJhhnqGhRJQmxVapnCLudryYa1gbpXpc1C7QK3eL/EgvskCWj3BM Ag8zeycUeARuo7MeHqupiJJBq07BlQmKStoIEJpXTbfyTnhgGd2jWpEfj4W1pfGen/9J dpUW80sCjq8Y6qe/AzTQakHUJ+iZ/498yq3gl75TqGlL1vZRidApAEVMZPUm+g+mh+d2 0PMSWrhszJTCb0BZCA89sLLZNuK3LpSitPOGPYIW/xsHURD0AjhmU1a7UZaCkSEP3VOy KT9g== X-Gm-Message-State: APjAAAWTaAUChEvlXQNYI95evylWsJlZaF5MirlqEgVwVtioo5M4D4R2 S9/KJpzdvy6Xd9CD5odMxtGv8Ue/zTk= X-Google-Smtp-Source: APXvYqzbWLaSnxMOBGpYqZQd2inFLTZ9e3TyqHxtKNH2kjYQHym/IbFKRqi9LPqkvc29+N3IJIfteg== X-Received: by 2002:aa7:85d8:: with SMTP id z24mr25711153pfn.202.1582081786948; Tue, 18 Feb 2020 19:09:46 -0800 (PST) Received: from [10.95.81.55] ([162.210.129.5]) by smtp.gmail.com with ESMTPSA id v184sm415395pfc.67.2020.02.18.19.09.44 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 18 Feb 2020 19:09:46 -0800 (PST) From: Tony Li Message-Id: <6549B961-D8B9-462A-94D1-A91AAA454A16@gmail.com> Content-Type: multipart/alternative; boundary="Apple-Mail=_92207400-1C4D-4DB2-8C27-8260D1067F79" Mime-Version: 1.0 (Mac OS X Mail 12.4 \(3445.104.11\)) Date: Wed, 19 Feb 2020 14:09:42 +1100 In-Reply-To: Cc: "lsr@ietf.org" To: Les Ginsberg References: X-Mailer: Apple Mail (2.3445.104.11) Archived-At: Subject: Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 19 Feb 2020 03:09:50 -0000 --Apple-Mail=_92207400-1C4D-4DB2-8C27-8260D1067F79 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=utf-8 > = https://datatracker.ietf.org/doc/draft-ginsberg-lsr-isis-flooding-scale/ = = advocates for a transmit based flow control where the transmitter = monitors the number of unacknowledged LSPs sent on each interface and = implements a backoff algorithm to slow the rate of sending LSPs based on = the length of the per interface unacknowledged queue. Les, This makes the assumption that there is a per-interface queue on the LSP = receiver. That has never been the case on any implementation that I=E2=80=99= ve ever seen. Without this assumption or more information, it seems difficult for the = LSP transmitter to have enough information about how to proceed. Tony --Apple-Mail=_92207400-1C4D-4DB2-8C27-8260D1067F79 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=utf-8
https://datatracker.ietf.org/doc/draft-ginsberg-lsr-isis-floodi= ng-scale/  advocates for a = transmit based flow control where the transmitter monitors the number of = unacknowledged LSPs sent on each interface and implements a backoff = algorithm to slow the rate of sending LSPs based on the length of the = per interface unacknowledged queue.


Les,

This makes the assumption that there is a per-interface queue = on the LSP receiver. That has never been the case on any implementation = that I=E2=80=99ve ever seen.

Without this assumption or more = information, it seems difficult for the LSP transmitter to have enough = information about how to proceed.

Tony

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Feb 2020 06:05:16 +0000 From: "Les Ginsberg (ginsberg)" To: Tony Li CC: "lsr@ietf.org" Thread-Topic: [Lsr] Flow Control Discussion for IS-IS Flooding Speed Thread-Index: AdXmy57fbkJZPBB7TgK3RmmTteJ+KgABmiUAAAXBVGA= Date: Wed, 19 Feb 2020 06:05:16 +0000 Message-ID: References: <6549B961-D8B9-462A-94D1-A91AAA454A16@gmail.com> In-Reply-To: <6549B961-D8B9-462A-94D1-A91AAA454A16@gmail.com> 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=ginsberg@cisco.com; x-originating-ip: [2001:420:c0c8:1005::756] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: acf05e9b-4c4f-486f-23a7-08d7b501b129 x-ms-traffictypediagnostic: MW3PR11MB4746: x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:8882; x-forefront-prvs: 0318501FAE x-forefront-antispam-report: SFV:NSPM; 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In-Reply-To: Cc: "lsr@ietf.org" To: Les Ginsberg References: <6549B961-D8B9-462A-94D1-A91AAA454A16@gmail.com> X-Mailer: Apple Mail (2.3445.104.11) Archived-At: Subject: Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 19 Feb 2020 06:15:37 -0000 --Apple-Mail=_61F6C9D8-B6C8-4A07-8CC5-B8BAB76327D1 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=utf-8 > The TX side flow control is purely based on performance on each = interface =E2=80=93 there are no implementation requirements imposed or = implied as regards the receiver. Then the LSP transmitter is operating without information from the LSP = receiver. Additional information from the receiver can help the = transmitter maintain a more accurate picture of reality and adapt to it = more quickly. Tony --Apple-Mail=_61F6C9D8-B6C8-4A07-8CC5-B8BAB76327D1 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=utf-8
The TX = side flow control is purely based on performance on each interface =E2=80=93= there are no implementation requirements imposed or implied as regards = the receiver.

Then the LSP transmitter is operating without = information from the LSP receiver. Additional information from the = receiver can help the transmitter maintain a more accurate picture of = reality and adapt to it more quickly.

Tony


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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 7r3IeDzrhleb for ; Tue, 18 Feb 2020 22:42:42 -0800 (PST) Received: from mail-pf1-x42a.google.com (mail-pf1-x42a.google.com [IPv6:2607:f8b0:4864:20::42a]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 17DDA120074 for ; Tue, 18 Feb 2020 22:42:42 -0800 (PST) Received: by mail-pf1-x42a.google.com with SMTP id i19so715466pfa.2 for ; Tue, 18 Feb 2020 22:42:42 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=sender:from:message-id:mime-version:subject:date:in-reply-to:cc:to :references; bh=h2e+y3jFA7fSZrRYXu3xgNk70JeErLmNMHZJs+c2m1Q=; b=SgBr4jN511C9B/NdOnZEznJ3fsK8z5YlbARjuB0mmKmWoR4X9p3VL1alPkoa9Fn9St 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APXvYqyWuIwEdFIf/XXmbsiHqjxb4kMZqqSlvB+mgVqjAxfI3QcSEZBE6Z+IA5vMLekea5Us1IfPZw== X-Received: by 2002:aa7:94a4:: with SMTP id a4mr25009638pfl.178.1582094561430; Tue, 18 Feb 2020 22:42:41 -0800 (PST) Received: from [10.95.81.70] ([162.210.129.5]) by smtp.gmail.com with ESMTPSA id a5sm1051598pjh.7.2020.02.18.22.42.39 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 18 Feb 2020 22:42:40 -0800 (PST) Sender: Tony Li From: tony.li@tony.li Message-Id: Content-Type: multipart/alternative; boundary="Apple-Mail=_8CF7F945-BE1D-42BB-8EB2-FFE489C99C63" Mime-Version: 1.0 (Mac OS X Mail 12.4 \(3445.104.11\)) Date: Wed, 19 Feb 2020 17:42:31 +1100 In-Reply-To: Cc: "lsr@ietf.org" To: Les Ginsberg References: <6549B961-D8B9-462A-94D1-A91AAA454A16@gmail.com> X-Mailer: Apple Mail (2.3445.104.11) Archived-At: Subject: Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 19 Feb 2020 06:42:44 -0000 --Apple-Mail=_8CF7F945-BE1D-42BB-8EB2-FFE489C99C63 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=utf-8 Les, > Then the LSP transmitter is operating without information from the LSP = receiver. Additional information from the receiver can help the = transmitter maintain a more accurate picture of reality and adapt to it = more quickly. > =20 > [Les:] This is your claim =E2=80=93 but you have not provided any = specifics as to how information sent by the receiver would provide = better adaptability than a Tx based flow control which is based on = actual performance. This is not a claim. This is normally how control loops work. See TCP. = When the receiver=E2=80=99s window opens, it can tell the transmitter. = When the receiver=E2=80=99s window closes, it can tell the transmitter. = If it only opens a little bit, it can tell the transmitter. > Nor have you addressed how the receiver would dynamically calculate = the values it would send. It can look at its input queue and report the current space. ~=E2=80=9DHi= , I=E2=80=99ve got buffers available for 20 packets, totalling 20kB.=E2=80= =9D~ =20 > For me how to do this is not at all obvious given common = implementation issues such as: > =20 > Sharing of a single punt path queue among many incoming = protocols/incoming interfaces The receiver gets to decide how much window it wants to provide to each = transmitter. Some oversubscription is probably a good thing. > Single interface independent input queue to IS-IS itself, making it = difficult to track the contribution of a single interface to the current = backlog It=E2=80=99s not clear that this is problematic. Again, reporting the = window size in this queue is helpful. > Distributed dataplanes This should definitely be a non-issue. An implementation should know the = data path from the interface to the IS-IS process, for all data planes = involved, and measure accordingly. > If we are to introduce new signaling/protocol extensions there needs = to be good reason and it must be practical to implement =E2=80=93 = especially since we have an alternate solution which is practical to = implement, dynamically responds to current state, and does not require = any protocol extensions. If we are to introduce new behaviors, they must be helpful. Estimates = that do not utilize the available information may be sufficiently = erroneous as to be harmful (see silly window syndrome). Tony --Apple-Mail=_8CF7F945-BE1D-42BB-8EB2-FFE489C99C63 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=utf-8

Les,

Then the = LSP transmitter is operating without information from the LSP receiver. = Additional information from the receiver can help the transmitter = maintain a more accurate picture of reality and adapt to it more = quickly.
 
[Les:] This = is your claim =E2=80=93 but you have not provided any specifics as to = how information sent by the receiver would provide better adaptability = than a Tx based flow control which is based on actual = performance.



This is not a claim. This is normally how control = loops work. See TCP. When the receiver=E2=80=99s window opens, it can = tell the transmitter. When the receiver=E2=80=99s window closes, it can = tell the transmitter. If it only opens a little bit, it can tell the = transmitter.


Nor have = you addressed how the receiver would dynamically calculate the values it = would send.


It can look at its input = queue and report the current space.  ~=E2=80=9DHi, I=E2=80=99ve got = buffers available for 20 packets, totalling 20kB.=E2=80=9D~ =  


For me how to do this is not at all obvious = given common implementation issues such as:
 
  • Sharing of a single punt path queue among many = incoming protocols/incoming = interfaces


The receiver gets to = decide how much window it wants to provide to each transmitter. Some = oversubscription is probably a good thing.


  • Single interface = independent input queue to IS-IS itself, making it difficult to track = the contribution of a single interface to the current = backlog


It=E2=80=99s not clear = that this is problematic.  Again, reporting the window size in this = queue is helpful.


  • Distributed = dataplanes


This should definitely = be a non-issue. An implementation should know the data path from the = interface to the IS-IS process, for all data planes involved, and = measure accordingly.


If we are to introduce new = signaling/protocol extensions there needs to be good reason and it must = be practical to implement =E2=80=93 especially since we have an = alternate solution which is practical to implement, dynamically responds = to current state, and does not require any protocol extensions.


If we are to introduce = new behaviors, they must be helpful. Estimates that do not utilize the = available information may be sufficiently erroneous as to be harmful = (see silly window syndrome).

Tony


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boundary="Apple-Mail=_BEB677E9-F4AA-45F6-9C81-3C28B0E81D77" Mime-Version: 1.0 (Mac OS X Mail 12.4 \(3445.104.11\)) Date: Wed, 19 Feb 2020 18:52:39 +1100 In-Reply-To: Cc: "lsr@ietf.org" To: Les Ginsberg References: <6549B961-D8B9-462A-94D1-A91AAA454A16@gmail.com> X-Mailer: Apple Mail (2.3445.104.11) Archived-At: Subject: Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 19 Feb 2020 07:52:48 -0000 --Apple-Mail=_BEB677E9-F4AA-45F6-9C81-3C28B0E81D77 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=utf-8 Les, > Overall, I think you are making general statements and not providing = needed specifics. I=E2=80=99m sorry it=E2=80=99s not specific enough for you. I=E2=80=99m = not sure that I can help to your satisfaction. > Maybe it=E2=80=99s obvious to you how a receiver based window would be = calculated =E2=80=93 but it isn=E2=80=99t obvious to me =E2=80=93 so = please help me out here with specifics. > What inputs do you need on the receive side in order to do the = necessary calculation? Well, there can be many, as it depends on the receiver=E2=80=99s = architecture. Now, I can=E2=80=99t talk about things that are under NDA = or company secret, so I=E2=80=99m pretty constrained. Talking about any = specific implementation is going to not be very helpful, so I propose = that we stick with a simplified model to start: a box with N interfaces = and a single input queue up to the CPU. The input queue is the only = possible bottleneck. Further, the avoid undue complexity (for the = moment =E2=80=94 it may return), let=E2=80=99s assume that the input = queue is in max-MTU sized packets, so that knowing the free entries in = this queue is entirely sufficient. Let the number of free entries be F. As previously noted, we will want some oversubscription factor. For the = sake of a simple model, let=E2=80=99s consider this a constant and call = it O. [For future reference, I suspect that we will want to come back = and make this more sophisticated, such as a Kalman filter, but again, to = start simply=E2=80=A6 ] Now, we want to report the free space devoted to the interface, but = derated by the oversubscription factor, so we end up reporting F*O/N.=20 Is that specific enough? > What assumptions are you making about how an implementation receives, = punts, dequeues IS-IS LSPs? None. > And how will this lead to better performance than having TX react to = actual throughput? The receiver will have better information. The transmitter can now = convey useful things like =E2=80=9CI processed all of your packets but = my queue is still congested=E2=80=9D, this would be a PSN that = acknowledges all outstanding LSPs but shows no free buffers. =20 > And please do not say =E2=80=9Cjust like TCP=E2=80=9D. I have made = some specific statements about how managing the resources associated = with a TCP connection is not at all similar to managing resources for = IGP flooding. > If you disagree =E2=80=93 please provide some specific explanations. I disagree with your disagreement. A control loop is a very simple = primitive in control theory. That=E2=80=99s what we=E2=80=99re trying = to create. Modulating the receive window through control feedback is a = control theory 101 technique. > It can look at its input queue and report the current space. ~=E2=80=9D= Hi, I=E2=80=99ve got buffers available for 20 packets, totalling = 20kB.=E2=80=9D~ =20 > =20 > [Les2:] None of the implementations I have worked on (at least 3) work = this way. Well, sorry, some of them do. In particular the Cisco AGS+ worked = exactly this way under IOS Classic in the day. It may have morphed. > For me how to do this is not at all obvious given common = implementation issues such as: > =20 > Sharing of a single punt path queue among many incoming = protocols/incoming interfaces > =20 > =20 > The receiver gets to decide how much window it wants to provide to = each transmitter. Some oversubscription is probably a good thing. > [Les2:] That wasn=E2=80=99t my point. Neither of us Is advocating = trying to completely eliminate retransmissions and/or transient = overload. > And since drops are possible, looking at the length of an input queue = isn=E2=80=99t necessarily going to tell you whether you are indeed = overloaded and if so due to what interface(s). Looking at the length of the input queue does give you a snapshot at = your congestion level. You are correct, it does NOT ascribe it to = specific interfaces. A more sophisticated implementation might modulate = its receive window inversely proportional to its interface input rate. > Tx side flow control is agnostic to receiver implementation strategy = and the reasons why LSPs remain unacknowledged.. Yes, it=E2=80=99s ignorant. That doesn=E2=80=99t make it better. The = point is to maximize the goodput. Systems theory tells us that we = improve frequency response when we provide feedback. That=E2=80=99s all = I=E2=80=99m suggesting. > =20 > Distributed dataplanes > =20 > =20 > This should definitely be a non-issue. An implementation should know = the data path from the interface to the IS-IS process, for all data = planes involved, and measure accordingly. > =20 > [Les2:] Again, you provide no specifics. Measure =E2=80=9Cwhat=E2=80=9D = accordingly? The input queue size for the data path from the given interface. > IF I do not have a queue dedicated solely to IS-IS packets to be = punted (and implementations may well use a single queue for multiple = protocols) what should I measure? How to get that info to the control = plane in real time? You should STILL use that queue size. That is still the bottleneck. You get that to the control plane by doing a PIO to the queue status = register in the dataplane ASIC. This is trivial. > If we are to introduce new behaviors, they must be helpful. Estimates = that do not utilize the available information may be sufficiently = erroneous as to be harmful (see silly window syndrome). > =20 > [Les2:] Again =E2=80=93 you try to apply TCP heuristics to IGP = flooding. Not at all intuitive to me that this applies =E2=80=93 I have = stated why. > =20 Please take a class in systems theory, analog electronics, or control = theory. Just stating that it does not apply does not make it true. Tony --Apple-Mail=_BEB677E9-F4AA-45F6-9C81-3C28B0E81D77 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=utf-8

Les,

Overall, I think you are = making  general statements and not providing needed = specifics.


I=E2=80=99m sorry it=E2=80= =99s not specific enough for you.  I=E2=80=99m not sure that I can = help to your satisfaction.


Maybe = it=E2=80=99s obvious to you how a receiver based window would be = calculated =E2=80=93 but it isn=E2=80=99t obvious to me =E2=80=93 so = please help me out here with specifics.
What inputs do you need on the receive = side in order to do the necessary = calculation?


Well, there can be many, = as it depends on the receiver=E2=80=99s architecture. Now, I can=E2=80=99t= talk about things that are under NDA or company secret, so I=E2=80=99m = pretty constrained.  Talking about any specific implementation is = going to not be very helpful, so I propose that we stick with a = simplified model to start: a box with N interfaces and a single input = queue up to the CPU.  The input queue is the only possible = bottleneck.  Further, the avoid undue complexity (for the moment = =E2=80=94 it may return), let=E2=80=99s assume that the input queue is = in max-MTU sized packets, so that knowing the free entries in this queue = is entirely sufficient.  Let the number of free entries be = F.

As previously noted, we will want = some oversubscription factor.  For the sake of a simple model, = let=E2=80=99s consider this a constant and call it O.  [For future = reference, I suspect that we will want to come back and make this more = sophisticated, such as a Kalman filter, but again, to start simply=E2=80=A6= ]

Now, we want to report the free = space devoted to the interface, but derated by the oversubscription = factor, so we end up reporting F*O/N. 

Is that specific enough?


What assumptions are you making about = how an implementation receives, punts, dequeues IS-IS = LSPs?


None.


And how = will this lead to better performance than having TX react to actual = throughput?


The receiver will have = better information. The transmitter can now convey useful things like = =E2=80=9CI processed all of your packets but my queue is still = congested=E2=80=9D, this would be a PSN that acknowledges all = outstanding LSPs but shows no free buffers.

 
And please do not say  =E2=80=9Cjust= like TCP=E2=80=9D. I have made some specific statements about how = managing the resources associated with a TCP connection is not at all = similar to managing resources for IGP flooding.
If you = disagree =E2=80=93 please provide some specific = explanations.


I disagree with your disagreement.  A control = loop is a very simple primitive in control theory.  That=E2=80=99s = what we=E2=80=99re trying to create.  Modulating the receive window = through control feedback is a control theory 101 = technique.


 It = can look at its input queue and report the current space.  ~=E2=80=9D= Hi, I=E2=80=99ve got buffers available for 20 packets, totalling = 20kB.=E2=80=9D~  
 
[Les2:] None of the = implementations I have worked on (at least 3) work this = way.


Well, sorry, some of = them do.  In particular the Cisco AGS+ worked exactly this way = under IOS Classic in the day.  It may have morphed.


For me how to do this is not at all obvious = given common implementation issues such as:
 
  • Sharing of a single = punt path queue among many incoming protocols/incoming = interfaces
 
 
The receiver gets to decide how much = window it wants to provide to each transmitter. Some oversubscription is = probably a good thing.
[Les2:] That wasn=E2=80=99t my = point. Neither of us Is advocating trying to completely eliminate = retransmissions and/or transient overload.
And since drops are possible, looking at the = length of an input queue isn=E2=80=99t necessarily going to tell you = whether you are indeed overloaded and if so due to what = interface(s).


Looking at the = length of the input queue does give you a snapshot at your congestion = level.  You are correct, it does NOT ascribe it to specific = interfaces.  A more sophisticated implementation might modulate its = receive window inversely proportional to its interface input = rate.


Tx side flow control is agnostic to receiver = implementation strategy and the reasons why LSPs remain = unacknowledged..
<= div>

Yes, it=E2=80=99s = ignorant.  That doesn=E2=80=99t make it better.  The point is = to maximize the goodput.  Systems theory tells us that we improve = frequency response when we provide feedback.  That=E2=80=99s all = I=E2=80=99m suggesting.


 
  • Distributed = dataplanes
 
 
This should definitely be a non-issue. = An implementation should know the data path from the interface to the = IS-IS process, for all data planes involved, and measure = accordingly.
 
[Les2:] = Again, you provide no specifics. Measure =E2=80=9Cwhat=E2=80=9D = accordingly?
=

The input queue size = for the data path from the given interface.


= IF I do not have a queue dedicated solely to IS-IS packets to be punted = (and implementations may well use a single queue for multiple protocols) = what should I measure? How to get that info to the control plane in real = time?


You should STILL use = that queue size.  That is still the bottleneck.

You get that to the control plane by doing a PIO = to the queue status register in the dataplane ASIC.  This is = trivial.


If we are to introduce new = behaviors, they must be helpful. Estimates that do not utilize the = available information may be sufficiently erroneous as to be harmful = (see silly window = syndrome).
 
[Les2:] Again =E2=80=93 you try = to apply TCP heuristics to IGP flooding. Not at all intuitive to me that = this applies =E2=80=93 I have stated why.
 
=


Please take a class in systems theory, analog = electronics, or control theory.  Just stating that it does not = apply does not make it true.

Tony

= --Apple-Mail=_BEB677E9-F4AA-45F6-9C81-3C28B0E81D77-- From nobody Wed Feb 19 00:56:47 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 524921200EF for ; Wed, 19 Feb 2020 00:56:46 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -14.502 X-Spam-Level: X-Spam-Status: No, score=-14.502 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIMWL_WL_MED=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, RCVD_IN_DNSWL_HI=-5, 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 DSH6h_kT6hrg for ; Wed, 19 Feb 2020 00:56:44 -0800 (PST) Received: from aer-iport-3.cisco.com (aer-iport-3.cisco.com [173.38.203.53]) (using TLSv1.2 with cipher DHE-RSA-SEED-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id AC3851200B5 for ; Wed, 19 Feb 2020 00:56:20 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=6344; q=dns/txt; s=iport; t=1582102580; x=1583312180; h=subject:to:cc:references:from:message-id:date: mime-version:in-reply-to:content-transfer-encoding; bh=4elGNY91ta0rLIuzr2Ix48es/r+C2CjbSWTimf+QQuA=; b=b44ZouD2yreTEzDJFmM+nmlbHO1vlu55qKk/Ae+OTqUNaIxt4YoB01v4 44TgNerpWJsMa2DLZr+Fcge83ebC8NAiJaOYlOSwzvRi96cDdnRfvUpvC YGtLP7rbPZavDh5droGX3ekyarWXsqVwI4sVvX2E8jFCI/Iy+1WPXuS3I 0=; X-IronPort-AV: E=Sophos;i="5.70,459,1574121600"; d="scan'208";a="21173659" Received: from aer-iport-nat.cisco.com (HELO aer-core-3.cisco.com) ([173.38.203.22]) by aer-iport-3.cisco.com with ESMTP/TLS/DHE-RSA-SEED-SHA; 19 Feb 2020 08:56:18 +0000 Received: from [10.60.140.52] (ams-ppsenak-nitro3.cisco.com [10.60.140.52]) by aer-core-3.cisco.com (8.15.2/8.15.2) with ESMTP id 01J8uILv028803; Wed, 19 Feb 2020 08:56:18 GMT To: tony.li@tony.li, Les Ginsberg Cc: "lsr@ietf.org" References: <6549B961-D8B9-462A-94D1-A91AAA454A16@gmail.com> From: Peter Psenak Message-ID: <5f9aae04-9729-40b0-df74-dfeab7b784f7@cisco.com> Date: Wed, 19 Feb 2020 09:56:17 +0100 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:60.0) Gecko/20100101 Thunderbird/60.7.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit X-Outbound-SMTP-Client: 10.60.140.52, ams-ppsenak-nitro3.cisco.com X-Outbound-Node: aer-core-3.cisco.com Archived-At: Subject: Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 19 Feb 2020 08:56:46 -0000 Tony, On 19/02/2020 08:52, tony.li@tony.li wrote: > > Les, > >> Overall, I think you are making  general statements and not providing >> needed specifics. > > > I’m sorry it’s not specific enough for you.  I’m not sure that I can > help to your satisfaction. > > >> Maybe it’s obvious to you how a receiver based window would be >> calculated – but it isn’t obvious to me – so please help me out here >> with specifics. >> What inputs do you need on the receive side in order to do the >> necessary calculation? > > > Well, there can be many, as it depends on the receiver’s architecture. > Now, I can’t talk about things that are under NDA or company secret, so > I’m pretty constrained.  Talking about any specific implementation is > going to not be very helpful, so I propose that we stick with a > simplified model to start: a box with N interfaces and a single input > queue up to the CPU.  The input queue is the only possible bottleneck. above is nowhere close to what the reality is, especially in the distributed system. In such system, packets traverses via multiple queues on both LC and RP and application like IGP has no visibility to these queues. thanks, Peter >  Further, the avoid undue complexity (for the moment — it may return), > let’s assume that the input queue is in max-MTU sized packets, so that > knowing the free entries in this queue is entirely sufficient.  Let the > number of free entries be F. > > As previously noted, we will want some oversubscription factor.  For the > sake of a simple model, let’s consider this a constant and call it O. >  [For future reference, I suspect that we will want to come back and > make this more sophisticated, such as a Kalman filter, but again, to > start simply… ] > > Now, we want to report the free space devoted to the interface, but > derated by the oversubscription factor, so we end up reporting F*O/N. > > Is that specific enough? > > >> What assumptions are you making about how an implementation receives, >> punts, dequeues IS-IS LSPs? > > > None. > > >> And how will this lead to better performance than having TX react to >> actual throughput? > > > The receiver will have better information. The transmitter can now > convey useful things like “I processed all of your packets but my queue > is still congested”, this would be a PSN that acknowledges all > outstanding LSPs but shows no free buffers. > >> And please do not say  “just like TCP”. I have made some specific >> statements about how managing the resources associated with a TCP >> connection is not at all similar to managing resources for IGP flooding. >> If you disagree – please provide some specific explanations. > > > I disagree with your disagreement.  A control loop is a very simple > primitive in control theory.  That’s what we’re trying to create. >  Modulating the receive window through control feedback is a control > theory 101 technique. > > >> It can look at its input queue and report the current space.  ~”Hi, >> I’ve got buffers available for 20 packets, totalling 20kB.”~ >> */[Les2:] None of the implementations I have worked on (at least 3) >> work this way./* > > > Well, sorry, some of them do.  In particular the Cisco AGS+ worked > exactly this way under IOS Classic in the day.  It may have morphed. > > >> */For me how to do this is not at all obvious given common >> implementation issues such as:/* >> *//* >> >> * */Sharing of a single punt path queue among many incoming >> protocols/incoming interfaces/* >> >> The receiver gets to decide how much window it wants to provide to >> each transmitter. Some oversubscription is probably a good thing. >> */[Les2:] That wasn’t my point. Neither of us Is advocating trying to >> completely eliminate retransmissions and/or transient overload./* >> */And since drops are possible, looking at the length of an input >> queue isn’t necessarily going to tell you whether you are indeed >> overloaded and if so due to what interface(s)./* > > > Looking at the length of the input queue does give you a snapshot at > your congestion level.  You are correct, it does NOT ascribe it to > specific interfaces.  A more sophisticated implementation might modulate > its receive window inversely proportional to its interface input rate. > > >> *//* >> */Tx side flow control is agnostic to receiver implementation strategy >> and the reasons why LSPs remain unacknowledged../* > > > Yes, it’s ignorant.  That doesn’t make it better.  The point is to > maximize the goodput.  Systems theory tells us that we improve frequency > response when we provide feedback.  That’s all I’m suggesting. > > >> * */Distributed dataplanes/* >> >> This should definitely be a non-issue. An implementation should know >> the data path from the interface to the IS-IS process, for all data >> planes involved, and measure accordingly. >> */[Les2:] Again, you provide no specifics. Measure “what” accordingly?/* > > > The input queue size for the data path from the given interface. > > >> */IF I do not have a queue dedicated solely to IS-IS packets to be >> punted (and implementations may well use a single queue for multiple >> protocols) what should I measure? How to get that info to the control >> plane in real time?/* > > > You should STILL use that queue size.  That is still the bottleneck. > > You get that to the control plane by doing a PIO to the queue status > register in the dataplane ASIC.  This is trivial. > > >> If we are to introduce new behaviors, they must be helpful. >> Estimates that do not utilize the available information may be >> sufficiently erroneous as to be harmful (see silly window syndrome). >> >> */[Les2:] Again – you try to apply TCP heuristics to IGP flooding. Not >> at all intuitive to me that this applies – I have stated why./* >> *//* > > > Please take a class in systems theory, analog electronics, or control > theory.  Just stating that it does not apply does not make it true. > > Tony > From nobody Wed Feb 19 01:07:22 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id B84E2120024 for ; Wed, 19 Feb 2020 01:07:20 -0800 (PST) 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, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=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=raszuk.net Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id TJNmXYQgy327 for ; Wed, 19 Feb 2020 01:07:18 -0800 (PST) Received: from mail-ot1-x32d.google.com (mail-ot1-x32d.google.com [IPv6:2607:f8b0:4864:20::32d]) (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 5664412001A for ; Wed, 19 Feb 2020 01:07:18 -0800 (PST) Received: by mail-ot1-x32d.google.com with SMTP id 66so22429274otd.9 for ; Wed, 19 Feb 2020 01:07:18 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=raszuk.net; s=google; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=3CyhlJvCal6YVKly/fXl3ejuVpmuIQdN3GK/e8Q4sK0=; b=D6kSWSf4nw6/JnJjliflb+dFF54LphjVWJGOKuE/QUubjJDK2Z9Eb69bMhoH2TOG5s C8H3tSjJmpd1pRI9pvYBAxx5N3KFnU1Q0g29bZXmlxSuv8WFOfsqAiWuT+Eu0Pqw0YWK 6GAWUrDpGlwt0Mjyo33+cpMxe5ZhwiWg+2Ge9hF571i8e+9/0TkRhfm90HnDDBlrGmGu OtlqZ85FdfCzk2vDMkGG3j+J0CfO0G0MmecBhOrQAA8x+p3ax24L5nMWnci1Mglno63y dP5MDEg/u6uu3rEUeJDbxTALYp/DZDBh9ruE0bnCKTz4BGKownL8RMZcG0pYRSm6aIxE 7VWA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=3CyhlJvCal6YVKly/fXl3ejuVpmuIQdN3GK/e8Q4sK0=; b=j3VFNoEQOoUrkWEnWcQU1V6NOn9wFfUfrSSkmoqTMO0BUCaPs/lyqGCCyKRtGaaWdB N1bCYVFfl2YNfP3R+p7nuDd5DbP6z8LB+stKfKlaIASlieVDNWOrYAzxZBxqVn3aXbhR BiOnvzhbFzq+lcHftusGaq74xY52ZuAb8yPTW+gx0pBrUpFLWd1d8gcDKxAmMLptujcw 9FtyIpbbzFOux3kJtqUZHCtzMIYfM9UFW1FwJccj0LMoFOMyCMnvPDJ8sugDvNkcq+f/ gUaHYr4nZfUNPanQ5kJBaz8vbCFdNcbPoVLFn6HCogfzsar5eakXtov0kbaQmRTY1keT Q09Q== X-Gm-Message-State: APjAAAWL65rosMRKbvgQo7skxdKdGGVAuFIAgmv017FIbvr0kAYZ/ZsX ssadRfrdx1id+5xj/HIRHWNhVuBXAUUC0BRZDlmEfg== X-Google-Smtp-Source: APXvYqzW3koyZOAyjTNUMzyypoEGR51uwAV+w13kEdmaYCAorpFSEoGX9ft2iZ1ZtXd3Z0warI7fBZsHfmOOpiEEs1g= X-Received: by 2002:a05:6830:1385:: with SMTP id d5mr19575261otq.61.1582103237489; Wed, 19 Feb 2020 01:07:17 -0800 (PST) MIME-Version: 1.0 References: In-Reply-To: From: Robert Raszuk Date: Wed, 19 Feb 2020 10:07:08 +0100 Message-ID: To: "Les Ginsberg (ginsberg)" Cc: "lsr@ietf.org" Content-Type: multipart/alternative; boundary="000000000000780f75059eea1d2b" Archived-At: Subject: Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 19 Feb 2020 09:07:21 -0000 --000000000000780f75059eea1d2b Content-Type: text/plain; charset="UTF-8" Hi Les & all, Watching this discussion I would like to state that IMO going with transmitter based rate limiting (I would not call it flow control) is much easier option to deploy and operate. It also has no dependency across other side of p2p adj which is a very important factor. The only issue here is if generation of [P|C]SNPs is fast enough. Receiver based flow control is simple in flow theory however I have a feeling that if we are to go that path we would be much better to actually run ISIS flooding over DC-TCP and avoid reinventing the wheel. Thx, Robert. On Wed, Feb 19, 2020 at 3:26 AM Les Ginsberg (ginsberg) wrote: > Two recent drafts advocate for the use of faster LSP flooding speeds in > IS-IS: > > > > https://datatracker.ietf.org/doc/draft-decraene-lsr-isis-flooding-speed/ > > https://datatracker.ietf.org/doc/draft-ginsberg-lsr-isis-flooding-scale/ > > > > There is strong agreement on two key points: > > > > 1)Modern networks require much faster flooding speeds than are commonly in > use today > > > > 2)To deploy faster flooding speeds safely some form of flow control is > needed > > > > The key point of contention between the two drafts is how flow control > should be implemented. > > > > https://datatracker.ietf.org/doc/draft-decraene-lsr-isis-flooding-speed/ > advocates for a receiver based flow control where the receiver advertises > in hellos the parameters which indicate the rate/burst size which the > receiver is capable of supporting on the interface. Senders are required to > limit the rate of LSP transmission on that interface in accordance with the > values advertised by the receiver. > > > > https://datatracker.ietf.org/doc/draft-ginsberg-lsr-isis-flooding-scale/ > advocates for a transmit based flow control where the transmitter monitors > the number of unacknowledged LSPs sent on each interface and implements a > backoff algorithm to slow the rate of sending LSPs based on the length of > the per interface unacknowledged queue. > > > > While other differences between the two drafts exist, it is fair to say > that if agreement could be reached on the form of flow control then it is > likely other issues could be resolved easily. > > > > This email starts the discussion regarding the flow control issue. > > > > > _______________________________________________ > Lsr mailing list > Lsr@ietf.org > https://www.ietf.org/mailman/listinfo/lsr > --000000000000780f75059eea1d2b Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hi Les & all,

Watching this discuss= ion I would like to state that IMO going with transmitter based rate limiti= ng (I would not call it flow control) is much easier option to deploy and o= perate. It also has no dependency across other side of p2p adj which is a v= ery important factor. The only issue here is if generation of [P|C]SNPs is = fast enough.=C2=A0

Receiver based flow control is = simple in flow theory however I have a feeling that if we are to go that pa= th we would be much better to actually run ISIS flooding over DC-TCP and av= oid reinventing the wheel.=C2=A0

Thx,
Ro= bert.

On Wed, Feb 19, 2020 at 3:26 AM Les Ginsberg (ginsberg) <ginsberg@cisco.com> wrote:

Two recent drafts advocate for the use of faster LSP= flooding speeds in IS-IS:

=C2=A0

https://datatracker.ietf.org/doc/draft-decraene-lsr-isis-flooding-speed/=

https://datatracker.ietf.org/doc/draft-ginsberg-lsr-isis-flooding-scale/=

=C2=A0

There is strong agreement on two key points:<= u>

=C2=A0

1)Modern networks require much faster flooding speed= s than are commonly in use today

=C2=A0

2)To deploy faster flooding speeds safely some form = of flow control is needed

=C2=A0

The key point of contention between the two drafts i= s how flow control should be implemented.

=C2=A0

https://datatracker.ietf.org/doc/draft-decraene-lsr-isis-flooding-speed/= advocates for a receiver based flow control where the receiver advertises in hellos the parameters which indicate the = rate/burst size which the receiver is capable of supporting on the interfac= e. Senders are required to limit the rate of LSP transmission on that inter= face in accordance with the values advertised by the receiver.

=C2=A0

https://datatracker.ietf.org/doc/draft-ginsberg-lsr-isis-flooding-scale/= =C2=A0advocates for a transmit based flow control where the transmitter monitors the number of unacknowledged LSPs sent on e= ach interface and implements a backoff algorithm to slow the rate of sendin= g LSPs based on the length of the per interface unacknowledged queue.

=C2=A0

While other differences between the two drafts exist= , it is fair to say that if agreement could be reached on the form of flow = control=C2=A0 then it is likely other issues could be resolved easily.

=C2=A0

This email starts the discussion regarding the flow = control issue.

=C2=A0

=C2=A0

_______________________________________________
Lsr mailing list
Lsr@ietf.org
https://www.ietf.org/mailman/listinfo/lsr
--000000000000780f75059eea1d2b-- From nobody Wed Feb 19 01:30:16 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 65D71120024 for ; Wed, 19 Feb 2020 01:30:14 -0800 (PST) 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, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=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 TpNrC4m4AVz3 for ; Wed, 19 Feb 2020 01:30:12 -0800 (PST) Received: from mail-pg1-x529.google.com (mail-pg1-x529.google.com [IPv6:2607:f8b0:4864:20::529]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 886BD12001A for ; Wed, 19 Feb 2020 01:30:12 -0800 (PST) Received: by mail-pg1-x529.google.com with SMTP id b9so12289527pgk.12 for ; Wed, 19 Feb 2020 01:30:12 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=content-transfer-encoding:from:mime-version:subject:date:message-id :references:cc:in-reply-to:to; bh=LvWDD/NK/P+jtQFjzXVMW5kSu6ro1i8XVcO36zvJn6Y=; b=bjyNGJU0lp/rkdAVH94gG6A3kf21QdrUHB/SUhrYOlCNwqraE2P/pzEYen95pgCwFR XRCG/8TSFCektLAg61gQ5sqtVAmDFfAxth3LinVAtH7feaCYM28u/OmV3l73tDgBPUD1 910+w5f17ALNi0D5q3TIOY2ANYOsEM5zyOv2Sq1VBWy3sPTDGLtKieDrsFdpAhdSBn55 zNylvlkQemz9Fzhmu4O0roRVg+N3YhlvgYqZu4QnFW8Ld5uzcPBPNm9EL4twOmvpe8zQ AnNAiwUEM7vduRX+h4u8ciYumVu8JypfSXzIFdS/6hVMODrJNBX4FLf7OpN+YDpMGAIN BMwA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:content-transfer-encoding:from:mime-version :subject:date:message-id:references:cc:in-reply-to:to; bh=LvWDD/NK/P+jtQFjzXVMW5kSu6ro1i8XVcO36zvJn6Y=; b=tyPtkbUy4rBPDJIiTUO3bJ3M5Yo2efLAl23ja55V/8DVZn9XmUPs8+cprlh5/XiPOX yL5DDjXUHJ6C+L9AvFLjJtJ1U3Z5DxkQ2jgmdKMWatzbySYgn6OmJ9VES1xON9VLegID uCt0jC8c+YTS/VaKstyEfB/a/wq7AExbbZgoGi6NybJqRy3A3gNF3gfHFaLNzWvFuPQB qqM8RDn/qCE3jUQMqGLmFXjer4JcGW77SiQhm+766FvqeFX1ui80xsVGmWspRn2NMrLr /pEBCgPz/MtgiqC5TPB7SG9UN8CDV1YUCFxOy7FXQQZrp9uoKvcDpCjCmhOu+LBQ/QwT iWnA== X-Gm-Message-State: APjAAAW6AIq2rTGXYTWAtX4s9k248vUHbUSGFuM8qa8abxSVNDVqtkyX ilKpst9fcDFcSJv5142AXZJHOg/bfMY= X-Google-Smtp-Source: APXvYqyXEujxH0OUSXCVacvS1Os/QN4/ASDBSxtu308U+GEDRl7gr7KY/g/JkqpT2hUg4UZly4PNLg== X-Received: by 2002:aa7:848c:: with SMTP id u12mr24698904pfn.12.1582104611933; Wed, 19 Feb 2020 01:30:11 -0800 (PST) Received: from [10.128.13.19] ([118.127.110.110]) by smtp.gmail.com with ESMTPSA id 23sm2028401pfh.28.2020.02.19.01.30.09 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 19 Feb 2020 01:30:10 -0800 (PST) Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: quoted-printable From: Tony Li Mime-Version: 1.0 (1.0) Date: Wed, 19 Feb 2020 20:30:04 +1100 Message-Id: <779C54C4-5500-4193-B70F-570ACB7A22A7@gmail.com> References: <5f9aae04-9729-40b0-df74-dfeab7b784f7@cisco.com> Cc: tony.li@tony.li, Les Ginsberg , "lsr@ietf.org" In-Reply-To: <5f9aae04-9729-40b0-df74-dfeab7b784f7@cisco.com> To: Peter Psenak X-Mailer: iPad Mail (17D50) Archived-At: Subject: Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 19 Feb 2020 09:30:15 -0000 Peter, > above is nowhere close to what the reality is, especially in the distribut= ed system. In such system, packets traverses via multiple queues on both LC a= nd RP and application like IGP has no visibility to these queues. As you may recall, I was lead software architect for NCS 6000. I am well aw= are that a distributed implementation is more complex. However, Les is insi= stent that we discuss specifics and that is most easily done with a simpler m= odel. The applications can get visibility into the queues through the same fundame= ntal mechanism: poll the various NPUs on the data path and report to the app= lication CPU. =20 Tony From nobody Wed Feb 19 01:44:10 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id C15DB12088F for ; Wed, 19 Feb 2020 01:44:07 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -14.502 X-Spam-Level: X-Spam-Status: No, score=-14.502 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIMWL_WL_MED=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, RCVD_IN_DNSWL_HI=-5, 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 k1Jyhx1zGXD4 for ; Wed, 19 Feb 2020 01:44:06 -0800 (PST) Received: from aer-iport-3.cisco.com (aer-iport-3.cisco.com [173.38.203.53]) (using TLSv1.2 with cipher DHE-RSA-SEED-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id BBF8A1200F9 for ; Wed, 19 Feb 2020 01:44:05 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=1131; q=dns/txt; s=iport; t=1582105445; x=1583315045; h=subject:to:cc:references:from:message-id:date: mime-version:in-reply-to:content-transfer-encoding; bh=VmepaiqBtsUh8J0E1qR2yq9chZ7oI7RQgX+Ymtrhr6o=; b=ke6X50XbjgAF0g81DtqSNKkfixfXSPnujN6LOsArxX1dVsM4TvGSyHmD 0J60FGoNjiX0ENgpRY2rCIFmLJhA0wsXgw9aucdFTJwCAoY7wrXtqXmja ap8nGhtkk1B1/iwhVxWUt0fatHQaqfjRz0OQHAmOGDrMavQdpC4VC8YJq c=; X-IronPort-AV: E=Sophos;i="5.70,459,1574121600"; d="scan'208";a="21175611" Received: from aer-iport-nat.cisco.com (HELO aer-core-4.cisco.com) ([173.38.203.22]) by aer-iport-3.cisco.com with ESMTP/TLS/DHE-RSA-SEED-SHA; 19 Feb 2020 09:44:04 +0000 Received: from [10.60.140.52] (ams-ppsenak-nitro3.cisco.com [10.60.140.52]) by aer-core-4.cisco.com (8.15.2/8.15.2) with ESMTP id 01J9i3qT000951; Wed, 19 Feb 2020 09:44:03 GMT To: Tony Li Cc: tony.li@tony.li, Les Ginsberg , "lsr@ietf.org" References: <5f9aae04-9729-40b0-df74-dfeab7b784f7@cisco.com> <779C54C4-5500-4193-B70F-570ACB7A22A7@gmail.com> From: Peter Psenak Message-ID: Date: Wed, 19 Feb 2020 10:44:03 +0100 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:60.0) Gecko/20100101 Thunderbird/60.7.0 MIME-Version: 1.0 In-Reply-To: <779C54C4-5500-4193-B70F-570ACB7A22A7@gmail.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-Outbound-SMTP-Client: 10.60.140.52, ams-ppsenak-nitro3.cisco.com X-Outbound-Node: aer-core-4.cisco.com Archived-At: Subject: Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 19 Feb 2020 09:44:08 -0000 Tony, On 19/02/2020 10:30, Tony Li wrote: > > Peter, > >> above is nowhere close to what the reality is, especially in the distributed system. In such system, packets traverses via multiple queues on both LC and RP and application like IGP has no visibility to these queues. > > > As you may recall, I was lead software architect for NCS 6000. I do recall :) >I am well aware that a distributed implementation is more complex. However, Les is insistent that we discuss specifics and that is most easily >done with a simpler model. > > The applications can get visibility into the queues through the same fundamental mechanism: poll the various NPUs on the data path and report to >the application CPU. everything is possible... Given many different hardware architectures one may run a single IGP implementation on, this becomes impractical and complex as each hardware architecture has its own specifics. One would rather keep the IGP implementation hardware agnostic, rather than providing hardware specific hooks for each platform it runs on. thanks, Peter > > Tony > > > From nobody Wed Feb 19 01:47:18 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 682661208AE for ; Wed, 19 Feb 2020 01:47:17 -0800 (PST) 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, SPF_HELO_NONE=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 UyOPWVxkrWj4 for ; Wed, 19 Feb 2020 01:47:15 -0800 (PST) Received: from mail-pj1-x102a.google.com (mail-pj1-x102a.google.com [IPv6:2607:f8b0:4864:20::102a]) (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 936CE1208AB for ; Wed, 19 Feb 2020 01:47:15 -0800 (PST) Received: by mail-pj1-x102a.google.com with SMTP id q39so2303457pjc.0 for ; Wed, 19 Feb 2020 01:47:15 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=content-transfer-encoding:from:mime-version:subject:date:message-id :references:cc:in-reply-to:to; bh=/rXrOAKcmQcl4usgCFeN+S10THX95xyGtTIeuZgoafk=; b=uRrFioaxqk87lnPOS6h7cN5YNMKCAWjh/qY6eBNjOQu4EW5XO2PYjI944miHUwvrQk g7cCqOqNjvJUKT2BxByLjJskg4T7l0fccqbfm1NcdeOKFEZtb6Y6QUJk70lelSxN3GFw /iQV8dzuimNCFNrKlU2fMCi6PFy338Up/0YjwWnwG4A7kRoLChFG2I7RkLjrYnz5YTyf /3k1RHp8K93XKEOrNExsBj8KHW2dsp/RIOkILxyXLugKyZgGuw5mH8W9SYQpItTsKjYj eg/jyvi+C2ffbCb6tVZawnNbkqbp6g1ek3mXGHzcTpCmivK/Df3MVUwQWsnbeJ0DcYWE +JEw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:content-transfer-encoding:from:mime-version :subject:date:message-id:references:cc:in-reply-to:to; bh=/rXrOAKcmQcl4usgCFeN+S10THX95xyGtTIeuZgoafk=; b=GaaHNCGI9+9SIM2K5jv85y6q4oa77f4KcWbMFtJ67bdElTIlLzYr15rqWAllcLveRo pAFWgU6ZIPmlwNKel564S9vwJEmurX1fhs46RddMecsypzQSeW7bnWijp6ah7Ccwxgqu ahgFxlkgWTL4JzoFS7khIJeMGOW1azkIPVGLcuprTiForUjYyU4ox82R6VM2jmZm5eY1 NSJ7gLR43sCLLKqzOY0VLLaT8sB6wjw/g0PxC9dRAL3w51EOuaM4gwkKjj3xlyTpDmCq cFZx3UwAqXJCrs299PLKpXvBOcCjiclQanMHWgXMvc4+riP/FvQ4EhvEfc+h72dInRgf Iu0g== X-Gm-Message-State: APjAAAXBra3Wbp+ssAVaWToyS9GTb0w4tQdtCO2t+HPJBFoDCPfe18Up cxTVnXizDApY+iu0gOkDOL0= X-Google-Smtp-Source: APXvYqxvxXCqnDPwYkt2YgtRWvPwNjaYf11V5c1fvKJkXMf2RhYrJqO+4YrnOaOwcAnaoNkG4CmLVQ== X-Received: by 2002:a17:902:41:: with SMTP id 59mr26055236pla.39.1582105634809; Wed, 19 Feb 2020 01:47:14 -0800 (PST) Received: from [10.128.13.19] ([118.127.110.110]) by smtp.gmail.com with ESMTPSA id w2sm2189961pfw.43.2020.02.19.01.47.13 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 19 Feb 2020 01:47:14 -0800 (PST) Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: quoted-printable From: Tony Li Mime-Version: 1.0 (1.0) Date: Wed, 19 Feb 2020 20:47:11 +1100 Message-Id: References: Cc: tony.li@tony.li, Les Ginsberg , "lsr@ietf.org" In-Reply-To: To: Peter Psenak X-Mailer: iPad Mail (17D50) Archived-At: Subject: Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 19 Feb 2020 09:47:17 -0000 Peter, > Given many different hardware architectures one may run a single IGP imple= mentation on, this becomes impractical and complex as each hardware architec= ture has its own specifics. One would rather keep the IGP implementation har= dware agnostic, rather than providing hardware specific hooks for each platf= orm it runs on. This is why your software architecture has a Platform Dependent component. T= his is a service that you should require from the PD layer. Tony From nobody Wed Feb 19 02:09:12 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id A2AA5120104 for ; Wed, 19 Feb 2020 02:09:10 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -14.502 X-Spam-Level: X-Spam-Status: No, score=-14.502 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, RCVD_IN_DNSWL_HI=-5, 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 vxaWB9rb627X for ; Wed, 19 Feb 2020 02:09:09 -0800 (PST) Received: from aer-iport-2.cisco.com (aer-iport-2.cisco.com [173.38.203.52]) (using TLSv1.2 with cipher DHE-RSA-SEED-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 5FE451200B5 for ; Wed, 19 Feb 2020 02:09:07 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=972; q=dns/txt; s=iport; t=1582106947; x=1583316547; h=subject:to:cc:references:from:message-id:date: mime-version:in-reply-to:content-transfer-encoding; bh=i0BN0NSQS0a/oQW1xg8DFX2VeFfbvE8tVc60lBn3Yt8=; b=dMg1KShU9vOlW01Rsd7+ycuKNigTZpP+w7jax1+lb3Tj9ckuCWHmCJyv U8AwRB+nw9IBhfJm2cIXVfmPzJQOw70bqceTzS2+f2Y2OC96K3rFHbif8 zW5kNmydpD33n96EJ1MRSjeaLL/48YEo0T9XpE9dDmZ6bJ903inQjLv4S Y=; X-IronPort-AV: E=Sophos;i="5.70,459,1574121600"; d="scan'208";a="23497089" Received: from aer-iport-nat.cisco.com (HELO aer-core-2.cisco.com) ([173.38.203.22]) by aer-iport-2.cisco.com with ESMTP/TLS/DHE-RSA-SEED-SHA; 19 Feb 2020 10:09:05 +0000 Received: from [10.60.140.52] (ams-ppsenak-nitro3.cisco.com [10.60.140.52]) by aer-core-2.cisco.com (8.15.2/8.15.2) with ESMTP id 01JA941P027136; Wed, 19 Feb 2020 10:09:05 GMT To: Tony Li Cc: tony.li@tony.li, Les Ginsberg , "lsr@ietf.org" References: From: Peter Psenak Message-ID: <5b430357-56ad-2901-f5a8-c0678a507293@cisco.com> Date: Wed, 19 Feb 2020 11:09:04 +0100 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:60.0) Gecko/20100101 Thunderbird/60.7.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-Outbound-SMTP-Client: 10.60.140.52, ams-ppsenak-nitro3.cisco.com X-Outbound-Node: aer-core-2.cisco.com Archived-At: Subject: Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 19 Feb 2020 10:09:11 -0000 Tony, On 19/02/2020 10:47, Tony Li wrote: > > Peter, > >> Given many different hardware architectures one may run a single IGP implementation on, this becomes impractical and complex as each hardware architecture has its own specifics. One would rather keep the IGP implementation hardware agnostic, rather than providing hardware specific hooks for each platform it runs on. > > This is why your software architecture has a Platform Dependent component. This is a service that you should require from the PD layer. I'm aware of the PD layer and that is not the issue. The problem is that there is no common value to report across different PD layers, as each architecture may have different number of queues involved, etc. Trying to find a common value to report to IPGs across various PDs would involve some PD specific logic and that is the part I'm referring to and I would like NOT to get into. thanks, Peter > > Tony > > > From nobody Wed Feb 19 02:37:56 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 2859112011C for ; Wed, 19 Feb 2020 02:37:54 -0800 (PST) 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, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=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 XDXSPEUGN6xu for ; Wed, 19 Feb 2020 02:37:52 -0800 (PST) Received: from mail-pg1-x532.google.com (mail-pg1-x532.google.com [IPv6:2607:f8b0:4864:20::532]) (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 91EDB1200EB for ; Wed, 19 Feb 2020 02:37:52 -0800 (PST) Received: by mail-pg1-x532.google.com with SMTP id z12so12529942pgl.4 for ; Wed, 19 Feb 2020 02:37:52 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=content-transfer-encoding:from:mime-version:subject:date:message-id :references:cc:in-reply-to:to; bh=1BaIZP8uHNlG2k66/WOTTdMRqI5qZK/MHs8qMJiJr1c=; b=XR7f1m1FFhtB8NAs6SQ7kBHm6u8WBMzjsYWyRchmbtcithDZg7PAqxLQkYMdWyNJzz EMIB5AD4FTf9my7zGJbcgzcU89vN934KoQFBjIyBSeuXWveuGg0pxEQxDygoTxhiebTy 8EeqpboDaQDS7hey5s5815Ekn3jifLKe12HqiVxxrt20W5quQc706KqRQN9tJylx6QV4 UKeIPGFviAgRw8r1kj1Ze/kMpBr6nQ0G51jpT+8MwvJDGjQ52QA7rLEUqtrV6Iu6tC3x 2o4FudNqcb7DWmlpsjBAODizKyXu+dNrAudVEdQIqBRHeoCJ9MmDIzUXkepK9GOkc5KT xdZQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:content-transfer-encoding:from:mime-version :subject:date:message-id:references:cc:in-reply-to:to; bh=1BaIZP8uHNlG2k66/WOTTdMRqI5qZK/MHs8qMJiJr1c=; b=DVMhvqP2Za/oE2ZDpcMxtAGwmJfQiJozDh4fUTbjobnzMIwBvZII6ZGrKt0HeoJZhg LhzcCwECcx233uquQHYUgjsu4Yyd0dOo+9x/e4o33TGSEjCrPGbrn1E5TCBrVKNQ0a+A 0tU4rgjr9gvJf+20T8414UyMEH7rc34gyeSRFFWaeEC7+HrFShPb0KNoIYxh/5QkhSel VgWmM0AWc8gYV6DJxUyOLU+umrfB+RJlHng7bsthzOd4PlJn0iA4OArSjA60/M0C51AY dfUmcLuJzMXjC3n6lzKbR+iETQR8+VMKyGnopC9bxA7zRGbbtzsR8/rLGnvpZ9pysX2a T+dg== X-Gm-Message-State: APjAAAXui9rhpAYUyxoavfErOpb4wg0CEVThNTpC1zRRwQucJD+aAV6l KBpbv6BFS9U8ZmkTbUpmUsw4WYduP38= X-Google-Smtp-Source: APXvYqx9rR5R8hMFjWMFzuVtQhkL5vGG0DorgrOVuQOyTu2OkJZmfK/SRxqSmYVib72GoVeT7PFh8g== X-Received: by 2002:a65:4382:: with SMTP id m2mr1330434pgp.3.1582108671959; Wed, 19 Feb 2020 02:37:51 -0800 (PST) Received: from [10.128.13.19] ([118.127.110.110]) by smtp.gmail.com with ESMTPSA id q8sm2194766pje.2.2020.02.19.02.37.50 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 19 Feb 2020 02:37:51 -0800 (PST) Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable From: Tony Li Mime-Version: 1.0 (1.0) Date: Wed, 19 Feb 2020 21:37:45 +1100 Message-Id: <4FC90EB2-D355-4DC5-8365-E5FBE037954E@gmail.com> References: <5b430357-56ad-2901-f5a8-c0678a507293@cisco.com> Cc: tony.li@tony.li, Les Ginsberg , "lsr@ietf.org" In-Reply-To: <5b430357-56ad-2901-f5a8-c0678a507293@cisco.com> To: Peter Psenak X-Mailer: iPad Mail (17D50) Archived-At: Subject: Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 19 Feb 2020 10:37:54 -0000 Peter, > I'm aware of the PD layer and that is not the issue. The problem is that t= here is no common value to report across different PD layers, as each archit= ecture may have different number of queues involved, etc. Trying to find a c= ommon value to report to IPGs across various PDs would involve some PD speci= fic logic and that is the part I'm referring to and I would like NOT to get i= nto. I=E2=80=99m sorry that scares you. It would seem like an initial implementa= tion might be to take the min of the free space of the queues leading from t= he interface to the CPU. I grant you that some additional sophistication may= be necessary, but I suspect that this is not going to become more complicat= ed than polynomial evaluation.=20 Tony From nobody Wed Feb 19 02:49:31 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 0FA591200EB for ; Wed, 19 Feb 2020 02:49:29 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -14.502 X-Spam-Level: X-Spam-Status: No, score=-14.502 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIMWL_WL_MED=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, RCVD_IN_DNSWL_HI=-5, 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 qZ1A7k9bAkDS for ; Wed, 19 Feb 2020 02:49:26 -0800 (PST) Received: from aer-iport-1.cisco.com (aer-iport-1.cisco.com [173.38.203.51]) (using TLSv1.2 with cipher DHE-RSA-SEED-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 73AFE12003E for ; Wed, 19 Feb 2020 02:49:26 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=1237; q=dns/txt; s=iport; t=1582109366; x=1583318966; h=subject:to:cc:references:from:message-id:date: mime-version:in-reply-to:content-transfer-encoding; bh=cVO+a/BvbOV6ObGW97EXKf8F2Pc9DLsXNPpJ/y7DcRI=; b=B1K9sgFeTQNYWiqd6ZD3coCq715PNccCoUkLwneyOBZMWRdgabT/CuKw AWOcfzC1kzRZndAlFmB/KmvuZtsUteA+Diqd0AkQkHZV5izII07/lne9i j8mz1DlRA0kC4stGMTGiOPAZbkbs+8Q6BZO8L2PR7S6Ip3MXFzt4a9J9W Q=; X-IronPort-AV: E=Sophos;i="5.70,459,1574121600"; d="scan'208";a="23499170" Received: from aer-iport-nat.cisco.com (HELO aer-core-4.cisco.com) ([173.38.203.22]) by aer-iport-1.cisco.com with ESMTP/TLS/DHE-RSA-SEED-SHA; 19 Feb 2020 10:49:24 +0000 Received: from [10.147.24.17] ([10.147.24.17]) by aer-core-4.cisco.com (8.15.2/8.15.2) with ESMTP id 01JAnNqu017927; Wed, 19 Feb 2020 10:49:24 GMT To: Tony Li Cc: Les Ginsberg , tony.li@tony.li, "lsr@ietf.org" References: <5b430357-56ad-2901-f5a8-c0678a507293@cisco.com> <4FC90EB2-D355-4DC5-8365-E5FBE037954E@gmail.com> From: Peter Psenak Message-ID: Date: Wed, 19 Feb 2020 11:49:20 +0100 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:60.0) Gecko/20100101 Thunderbird/60.7.0 MIME-Version: 1.0 In-Reply-To: <4FC90EB2-D355-4DC5-8365-E5FBE037954E@gmail.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit X-Outbound-SMTP-Client: 10.147.24.17, [10.147.24.17] X-Outbound-Node: aer-core-4.cisco.com Archived-At: Subject: Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 19 Feb 2020 10:49:29 -0000 Tony, On 19/02/2020 11:37, Tony Li wrote: > Peter, > >> I'm aware of the PD layer and that is not the issue. The problem is that there is no common value to report across different PD layers, as each architecture may have different number of queues involved, etc. Trying to find a common value to report to IPGs across various PDs would involve some PD specific logic and that is the part I'm referring to and I would like NOT to get into. > > > I’m sorry that scares you. It would seem like an initial implementation might be to take the min of the free space of the queues leading from the >interface to the CPU. I grant you that some additional sophistication may be necessary, but I suspect that this is not going to become more >complicated than polynomial evaluation. I'm not scared of polynomial evaluation, but the fact that my IGP implementation is dependent on the PD specifics, which are not generally available and need to be custom built for each PD specifically. I always thought a good IGP implementation is PD agnostic. thanks, Peter > > Tony > > _______________________________________________ > Lsr mailing list > Lsr@ietf.org > https://www.ietf.org/mailman/listinfo/lsr > > From nobody Wed Feb 19 09:48:58 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id DC80012085B for ; Wed, 19 Feb 2020 09:48:56 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -14.5 X-Spam-Level: X-Spam-Status: No, score=-14.5 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, 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 header.b=fsZQUqJ/; dkim=pass (1024-bit key) header.d=cisco.onmicrosoft.com 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Feb 2020 17:48:49 +0000 From: "Les Ginsberg (ginsberg)" To: Robert Raszuk CC: "lsr@ietf.org" Thread-Topic: [Lsr] Flow Control Discussion for IS-IS Flooding Speed Thread-Index: AdXmy57fbkJZPBB7TgK3RmmTteJ+KgAOFdkAABH9+fA= Date: Wed, 19 Feb 2020 17:48:49 +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=ginsberg@cisco.com; x-originating-ip: [2001:420:c0c8:1005::756] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: a443adc6-84a2-4a30-6e13-08d7b563f9cc x-ms-traffictypediagnostic: MW3PR11MB4713: x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:10000; x-forefront-prvs: 0318501FAE x-forefront-antispam-report: SFV:NSPM; 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Message-ID: To: "Les Ginsberg (ginsberg)" Cc: "lsr@ietf.org" Content-Type: multipart/alternative; boundary="0000000000004bc2c2059ef254c3" Archived-At: Subject: Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 19 Feb 2020 18:55:20 -0000 --0000000000004bc2c2059ef254c3 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hi Les, Yes this "small delay" of ACK aggregation is something which I am a bit worried here from SNPs sender side. Now as indeed draft mentioned prioritizing SNPs on reception let me indicate that some platforms I have not so long ago dealt with do not even prioritize any IGP packet over other packets at neither ingress LC nor queue to RE/RP. If that channel takes 100s of ms within the box I am afraid all bets for flooding improvement are off. Thx R,. On Wed, Feb 19, 2020 at 6:48 PM Les Ginsberg (ginsberg) wrote: > Robert =E2=80=93 > > > > Thanx for your input. > > > > Note that one of the suggestions in > https://datatracker.ietf.org/doc/draft-ginsberg-lsr-isis-flooding-scale/ > is to prioritize the reception of SNPs over LSPs so that we are less > likely to drop ACKs. > > It is not clear to me why you think SNP generation would be an issue. > > Once a received LSP is processed one of the outputs is to set a per > interface flag indicating that an ACK (PSNP) needs to be sent (SSN flag). > Implementations usually implement some small delay so that multiple ACKs > can be sent in a single PSNP =E2=80=93 but I do not see why this should b= e viewed > as a bottleneck. > > > > If your concern is that we need to emphasize the importance of sending > timely ACKs, I think we could look at text that makes that point. > > > > Les > > > > > > *From:* Lsr *On Behalf Of * Robert Raszuk > *Sent:* Wednesday, February 19, 2020 1:07 AM > *To:* Les Ginsberg (ginsberg) > *Cc:* lsr@ietf.org > *Subject:* Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed > > > > Hi Les & all, > > > > Watching this discussion I would like to state that IMO going with > transmitter based rate limiting (I would not call it flow control) is muc= h > easier option to deploy and operate. It also has no dependency across oth= er > side of p2p adj which is a very important factor. The only issue here is = if > generation of [P|C]SNPs is fast enough. > > > > Receiver based flow control is simple in flow theory however I have a > feeling that if we are to go that path we would be much better to actuall= y > run ISIS flooding over DC-TCP and avoid reinventing the wheel. > > > > Thx, > > Robert. > > --0000000000004bc2c2059ef254c3 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hi Les,=C2=A0

Yes this= "small delay" of ACK aggregation is something which I am a bit w= orried here from SNPs sender side.=C2=A0

Now as in= deed draft mentioned prioritizing SNPs on reception let me indicate that so= me platforms I have not so long ago dealt with do not even prioritize any I= GP packet over other packets at neither ingress LC nor queue to RE/RP. If t= hat channel takes 100s of ms within the box I am afraid=C2=A0all bets for f= looding improvement are off.=C2=A0

Thx
R= ,.


On Wed, Feb 19, 2020 at 6:48 PM Les Ginsberg (ginsbe= rg) <ginsberg@cisco.com> wr= ote:

Robert =E2=80=93

=C2=A0

Thanx for your input.

=C2=A0

Note that one of the suggestions in https://datatracker.ietf.org/doc/draft-ginsberg-lsr-isis-flooding-scale/ =C2=A0is to prioritize the reception of SNPs over LSPs so that we are les= s likely to drop ACKs.

It is not clear to me why you think SNP generation w= ould be an issue.

Once a received LSP is processed one of the outputs = is to set a per interface flag indicating that an ACK (PSNP) needs to be se= nt (SSN flag). Implementations usually implement some small delay so that m= ultiple ACKs can be sent in a single PSNP =E2=80=93 but I do not see why this should be viewed as a bottleneck.=

=C2=A0

If your concern is that we need to emphasize the imp= ortance of sending timely ACKs, I think we could look at text that makes th= at point.

=C2=A0

=C2=A0=C2=A0 Les

=C2=A0

=C2=A0

From: Lsr <lsr-bounces@ietf.org> On Behalf Of Robert Raszuk
Sent: Wednesday, February 19, 2020 1:07 AM
To: Les Ginsberg (ginsberg) <ginsberg@cisco.com>
Cc: lsr@ietf.org
Subject: Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed<= u>

=C2=A0

Hi Les & all,

=C2=A0

Watching this discussion I would like to state that = IMO going with transmitter based rate limiting (I would not call it flow co= ntrol) is much easier option to deploy and operate. It also has no dependen= cy across other side of p2p adj which is a very important factor. The only issue here is if generation of [P|C]S= NPs is fast enough.=C2=A0

=C2=A0

Receiver based flow control is simple in flow theory= however I have a feeling that if we are to go that path we would be much b= etter to actually run ISIS flooding over DC-TCP and avoid reinventing the w= heel.=C2=A0

=C2=A0

Thx,

Robert.

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Tony Li From: tony.li@tony.li Message-Id: <4D5A06BB-0522-4FB5-B783-4AD7C78F8EC0@tony.li> Content-Type: multipart/alternative; boundary="Apple-Mail=_C4B8B322-6D67-4B5E-843C-C17B1222F4DF" Mime-Version: 1.0 (Mac OS X Mail 12.4 \(3445.104.11\)) Date: Thu, 20 Feb 2020 06:25:23 +1100 In-Reply-To: Cc: Les Ginsberg , "lsr@ietf.org" To: Peter Psenak References: <5b430357-56ad-2901-f5a8-c0678a507293@cisco.com> <4FC90EB2-D355-4DC5-8365-E5FBE037954E@gmail.com> X-Mailer: Apple Mail (2.3445.104.11) Archived-At: Subject: Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 19 Feb 2020 19:25:30 -0000 --Apple-Mail=_C4B8B322-6D67-4B5E-843C-C17B1222F4DF Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=utf-8 Peter, > I'm not scared of polynomial evaluation, but the fact that my IGP = implementation is dependent on the PD specifics, which are not generally = available and need to be custom built for each PD specifically. I always = thought a good IGP implementation is PD agnostic. Your implementation is always dependent on the underlying hardware. We = have timers, we have filesystems, we have I/O subsystems, threads, and = clocks to contend with. The input queue in the hardware is a fact of = life and knowing about it can improve our implementations. Because the PD layer can provide isolation from the specifics, the IGP = implementation is reasonably abstracted from those specifics, in much = the same way that the OS has abstracted us from the remainder of the = underlying hardware. All I=E2=80=99m proposing is adding one more item = to that PD abstraction. Regards, Tony --Apple-Mail=_C4B8B322-6D67-4B5E-843C-C17B1222F4DF Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=utf-8

Peter,

I'm not scared of polynomial = evaluation, but the fact that my IGP implementation is dependent on the = PD specifics, which are not generally available and need to be custom = built for each PD specifically. I always thought a good IGP = implementation is PD agnostic.


Your = implementation is always dependent on the underlying hardware.  We = have timers, we have filesystems, we have I/O subsystems, threads, and = clocks to contend with. The input queue in the hardware is a fact of = life and knowing about it can improve our implementations.

Because the PD layer can = provide isolation from the specifics, the IGP implementation is = reasonably abstracted from those specifics, in much the same way that = the OS has abstracted us from the remainder of the underlying hardware. = All I=E2=80=99m proposing is adding one more item to that PD = abstraction.

Regards,
Tony

= --Apple-Mail=_C4B8B322-6D67-4B5E-843C-C17B1222F4DF-- From nobody Wed Feb 19 11:25:54 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 86942120112 for ; Wed, 19 Feb 2020 11:25:53 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.998 X-Spam-Level: X-Spam-Status: No, score=-1.998 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_HELO_NONE=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 q6Cbz5l1aCVi for ; Wed, 19 Feb 2020 11:25:50 -0800 (PST) Received: from mail-io1-xd2a.google.com (mail-io1-xd2a.google.com [IPv6:2607:f8b0:4864:20::d2a]) (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 D18FA120088 for ; Wed, 19 Feb 2020 11:25:49 -0800 (PST) Received: by mail-io1-xd2a.google.com with SMTP id z8so1881203ioh.0 for ; Wed, 19 Feb 2020 11:25:49 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=d2uHWNUvV/WnNsJI11EKCYv91HFlU5YMeaXIhvZtRoE=; b=TgaBs3iw6osHuSDjbs0d2mlKZ21/swHaDdhWIuez6tlSQ0MY+LyESwVdiPlEW0qUtW 58WlQi4TyKi+j4dbj48zpCqsevGYrwJOWmG7Row/R3Ie/cKGk1hcR/ydRMkzu/L4q24M jv5dlxoh+PWfpNMF4dWrxEqfo5XZsLhWoRXojID0GP0S2FtNbybFGbhPd9Bx1DqaZbFV zKf0byKHvndOs0I+aSxnXhroBas7rWZ+ul0e6zpab4jHC20m4AJow3xnDfL7FgSUlKdQ r1jQiXeYZt9kt1nTK6ILNA4G8Cho/cAWIWTCzQyu/T+otYMXGToOsnxhrdZ19VWRaxNt XkKQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=d2uHWNUvV/WnNsJI11EKCYv91HFlU5YMeaXIhvZtRoE=; b=MBINCrsOPCCYZm8lb13MTNabC3wZZo7LZRByHyv5jRlSgQHrlIhbbUs6O/2VWttLfM 1R1A7vtoHfh0T/atWt3PU+v7OaPBGQ4IkPagfmJsj3KhDAafdbUHk4/zxBboAiZMhTFJ kma+iWmwaC5c1OUS4j7Oho3hibggY4dWajAbRsMDpdNuZjwKvAh+E932+fBPiA6etDTS WmcRHYVYevuHPZooI5MyoEra1QJhbdn9HWq6PURlYBxlX5VLKBya9RfpJrOIuW5W/b1M ySaUys8PyNGuVkTVx4H9oO3N3ix0tRW4bsiUpegq8us9EP/da+YOLmlNQZRvgSzZw0aI FYMA== X-Gm-Message-State: APjAAAWlF0n8XLonBOWxgUslBftNfFXs2Y2p7Ao++H3M5ipSlgtUksRJ KkV3iHfBjosBGMNQpQ6dAo2TeM4F2sE52iENojXIBw== X-Google-Smtp-Source: APXvYqwAJSNQq7p3mDAjYClGpxx0K3UdORvadiHyBJERE67v3TquYTMMFOCgngcNbcplzBkc8JfzNAGgUkbiJtr7V5M= X-Received: by 2002:a02:c78f:: with SMTP id n15mr22379918jao.100.1582140349065; Wed, 19 Feb 2020 11:25:49 -0800 (PST) MIME-Version: 1.0 References: <5b430357-56ad-2901-f5a8-c0678a507293@cisco.com> <4FC90EB2-D355-4DC5-8365-E5FBE037954E@gmail.com> In-Reply-To: From: Tony Przygienda Date: Wed, 19 Feb 2020 11:24:54 -0800 Message-ID: To: "Les Ginsberg (ginsberg)" Cc: "Peter Psenak (ppsenak)" , Tony Li , "lsr@ietf.org" , "tony.li@tony.li" Content-Type: multipart/alternative; boundary="0000000000007daf05059ef2c150" Archived-At: Subject: Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 19 Feb 2020 19:25:53 -0000 --0000000000007daf05059ef2c150 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Having worked for last couple of years on implementation of flooding speeds that converge LSDBs some order of magnitudes above today's speeds ;-) here's a bunch of observations 1. TX side is easy and useful. My observation having gone quickly over the -ginsberg- draft is that you really want a better hysterisis there, it's bit too vertical and you will generate oscillations rather than walk around the equilibrium ;-) 2. Queue per interface is fairly trivial with modern implementation techniques and memory sizes if done correctly. Yes, very memory constrained platforms are a mildly different game and kind of precondition a different discussion. 3. RX side is possible and somewhat useful but much harder to do well depending on flavor. If we're talking about the RX advertising a very static value to cap the flooding speed that's actually a useful knob to have IMO/IME. Trying to cleverly communicate to the TXer a window size is not only fiendishly difficult, incurs back propagation speed (not neglectible @ those rates IME) but can easily lead to subtle flood starvation behaviors and lots of slow starts due to mixture of control loop dynamics and implementation complexity of such a scheme. Though, giving the TXer some hint that a backpressure is desired is however not a bad thing IME and can be derived failry easily without needs for checking queue sizes and so on. It's observable by looking @ some standard stats on what is productive incoming rate on the interface. Anything smarter needs new TLVs on packets & then you have a problem under/oversampling based on hellos (too low a frequency) and ACKs (too bursty, too batchy) and flooded back LSPs (too unpredictable) For more details I can recommend rift draft of course ;-) otherwise I'm staying out from this mildly feline spat ;-) --- tony On Wed, Feb 19, 2020 at 9:59 AM Les Ginsberg (ginsberg) wrote: > Tony - > > Peter has a done a great job of highlighting that "single queue" is an > oversimplification - I have nothing to add to that discussion. > > I would like to point out another aspect of the Rx based solution. > > As you need to send signaling based upon dynamic receiver state and this > signaling is contained in unreliable PDUs (hellos) and to be useful this > signaling needs to be sent ASAP - you cannot wait until the next periodic > hello interval (default 10 seconds) to expire. So you are going to have t= o > introduce extra hello traffic at a time when protocol input queues are > already stressed. > > Given hellos are unreliable, the question of how many transmissions of th= e > update flow info is enough arises. You could make this more deterministic > by enhancing the new TLV to include information received from the neighbo= r > so that each side would know when the neighbor had received the updated > info. This then requires additional hellos be sent in both directions - > which exacerbates the queue issues on both receiver and transmitter. > > It is true (of course) that hellos should be treated with higher priority > than other PDUs, but this does not mean that the additional hellos have n= o > impact on the queue space available for LSPs/SNPs. > > Also, it seems like you are proposing interface independent logic, so you > will be adjusting flow information on all interfaces enabled for IS-IS, > which means that additional hello traffic will occur on all interfaces. A= t > scale this is concerning. > > Les > > > > -----Original Message----- > > From: Peter Psenak > > Sent: Wednesday, February 19, 2020 2:49 AM > > To: Tony Li > > Cc: Les Ginsberg (ginsberg) ; tony.li@tony.li; > > lsr@ietf.org > > Subject: Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed > > > > Tony, > > > > On 19/02/2020 11:37, Tony Li wrote: > > > Peter, > > > > > >> I'm aware of the PD layer and that is not the issue. The problem is > that > > there is no common value to report across different PD layers, as each > > architecture may have different number of queues involved, etc. Trying = to > > find a common value to report to IPGs across various PDs would involve > > some PD specific logic and that is the part I'm referring to and I woul= d > like > > NOT to get into. > > > > > > > > > I=E2=80=99m sorry that scares you. It would seem like an initial > implementation > > might be to take the min of the free space of the queues leading from t= he > > >interface to the CPU. I grant you that some additional sophistication > may be > > necessary, but I suspect that this is not going to become more > >complicated > > than polynomial evaluation. > > > > I'm not scared of polynomial evaluation, but the fact that my IGP > > implementation is dependent on the PD specifics, which are not generall= y > > available and need to be custom built for each PD specifically. I alway= s > > thought a good IGP implementation is PD agnostic. > > > > thanks, > > Peter > > > > > > > > Tony > > > > > > _______________________________________________ > > > Lsr mailing list > > > Lsr@ietf.org > > > https://www.ietf.org/mailman/listinfo/lsr > > > > > > > > _______________________________________________ > Lsr mailing list > Lsr@ietf.org > https://www.ietf.org/mailman/listinfo/lsr > --0000000000007daf05059ef2c150 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Having worked for last couple of years on implementat= ion of flooding speeds that converge LSDBs some order of magnitudes above t= oday's speeds=C2=A0 ;-) here's a bunch of observations
1. TX side is easy and useful. My observation having gone quic= kly over the -ginsberg- draft is that you really want a better hysterisis t= here, it's bit too vertical and you will generate oscillations rather t= han walk around the equilibrium ;-)
2. Queue per interface is fai= rly trivial with modern implementation techniques and memory sizes if done = correctly. Yes, very memory constrained platforms are a mildly different ga= me and kind of precondition a different discussion.
3. RX si= de is possible and somewhat useful but much harder to do well depending on = flavor. If we're talking about the RX advertising a very static value t= o cap the flooding speed that's actually a useful knob to have IMO/IME.= Trying to cleverly communicate to the TXer a window size is not only fiend= ishly difficult, incurs back propagation speed (not neglectible @ those rat= es IME) but can easily lead to subtle flood starvation behaviors and lots o= f slow starts due to mixture of control loop dynamics and implementation co= mplexity of such a scheme. Though, giving the TXer some hint that a backpre= ssure is desired is however not a bad thing IME and can be derived failry e= asily without needs for checking queue sizes and so on. It's observable= by looking @ some standard stats on what is productive incoming rate on th= e interface. Anything smarter needs new TLVs on packets & then you have= a problem under/oversampling based on hellos (too low a frequency) and ACK= s (too bursty, too batchy) and flooded back LSPs (too unpredictable)

For more details I can recommend rift draft of cours= e ;-)

otherwise I'm staying out from this= mildly feline spat ;-)

--- tony

On= Wed, Feb 19, 2020 at 9:59 AM Les Ginsberg (ginsberg) <ginsberg@cisco.com> wrote:
Tony -

Peter has a done a great job of highlighting that "single queue" = is an oversimplification - I have nothing to add to that discussion.

I would like to point out another aspect of the Rx based solution.

As you need to send signaling based upon dynamic receiver state and this si= gnaling is contained in unreliable PDUs (hellos) and to be useful this sign= aling needs to be sent ASAP - you cannot wait until the next periodic hello= interval (default 10 seconds) to expire. So you are going to have to intro= duce extra hello traffic at a time when protocol input queues are already s= tressed.

Given hellos are unreliable, the question of how many transmissions of the = update flow info is enough arises. You could make this more deterministic b= y enhancing the new TLV to include information received from the neighbor s= o that each side would know when the neighbor had received the updated info= . This then requires additional hellos be sent in both directions - which e= xacerbates the queue issues on both receiver and transmitter.

It is true (of course) that hellos should be treated with higher priority t= han other PDUs, but this does not mean that the additional hellos have no i= mpact on the queue space available for LSPs/SNPs.

Also, it seems like you are proposing interface independent logic, so you w= ill be adjusting flow information on all interfaces enabled for IS-IS, whic= h means that additional hello traffic will occur on all interfaces. At scal= e this is concerning.

=C2=A0 =C2=A0Les


> -----Original Message-----
> From: Peter Psenak <ppsenak@cisco.com>
> Sent: Wednesday, February 19, 2020 2:49 AM
> To: Tony Li <tony1athome@gmail.com>
> Cc: Les Ginsberg (ginsberg) <ginsberg@cisco.com>; tony.li@tony.li;
> lsr@ietf.org
> Subject: Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed >
> Tony,
>
> On 19/02/2020 11:37, Tony Li wrote:
> > Peter,
> >
> >> I'm aware of the PD layer and that is not the issue. The = problem is that
> there is no common value to report across different PD layers, as each=
> architecture may have different number of queues involved, etc. Trying= to
> find a common value to report to IPGs across various PDs would involve=
> some PD specific logic and that is the part I'm referring to and I= would like
> NOT to get into.
> >
> >
> > I=E2=80=99m sorry that scares you.=C2=A0 It would seem like an in= itial implementation
> might be to take the min of the free space of the queues leading from = the
> >interface to the CPU. I grant you that some additional sophisticat= ion may be
> necessary, but I suspect that this is not going to become more >com= plicated
> than polynomial evaluation.
>
> I'm not scared of polynomial evaluation, but the fact that my IGP<= br> > implementation is dependent on the PD specifics, which are not general= ly
> available and need to be custom built for each PD specifically. I alwa= ys
> thought a good IGP implementation is PD agnostic.
>
> thanks,
> Peter
>
> >
> > Tony
> >
> > _______________________________________________
> > Lsr mailing list
> > Lsr@ietf.org
> > https://www.ietf.org/mailman/listinfo/lsr
> >
> >

_______________________________________________
Lsr mailing list
Lsr@ietf.org
https://www.ietf.org/mailman/listinfo/lsr
--0000000000007daf05059ef2c150-- From nobody Wed Feb 19 11:29:29 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 512E6120086 for ; Wed, 19 Feb 2020 11:29:28 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.4 X-Spam-Level: X-Spam-Status: No, score=-1.4 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, FREEMAIL_FORGED_FROMDOMAIN=0.249, FREEMAIL_FROM=0.001, HEADER_FROM_DIFFERENT_DOMAINS=0.25, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001] autolearn=no autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id ymtZ3zAAqM_O for ; Wed, 19 Feb 2020 11:29:27 -0800 (PST) Received: from mail-pl1-x62b.google.com (mail-pl1-x62b.google.com [IPv6:2607:f8b0:4864:20::62b]) (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 E5095120045 for ; Wed, 19 Feb 2020 11:29:26 -0800 (PST) Received: by mail-pl1-x62b.google.com with SMTP id b22so462500pls.12 for ; Wed, 19 Feb 2020 11:29:26 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=sender:mime-version:subject:from:in-reply-to:date:cc :content-transfer-encoding:message-id:references:to; bh=wUEn38PBSUr6tFuQPffZ3c1IgZaZlueZJk+EZHzDuQM=; b=npI0LtYvECe8PgfllXPlLbSnQ2c/JtxQ01Yvcte/4cYVCxtwBGXVVPEsJlP6g7d2VD CqcvYl57vFhaXC/QkU/6Boa14pbN1F4xwAUE1b46dRFziUkMo946z2DyWjgxoyEKnKsz Bb72LSJ/lHwpS+LeWBxYgp8TtLU0CkoNgsS7mmRUJklLCfzMjZcGljcKdsXh+VgNUckm +CGVZuejuxcrJArutsAMv3gpkAr8sIwxGNKjk9NzdZB8ChJkDHapzuphLTuAvskaLfNI sCLnov7DLi8lUz/rrqMw90pPRwA1sHsOpLCsziBecjaMMruVklSQeJs2OsPm7Oq/OBeV U+Qg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:mime-version:subject:from:in-reply-to :date:cc:content-transfer-encoding:message-id:references:to; bh=wUEn38PBSUr6tFuQPffZ3c1IgZaZlueZJk+EZHzDuQM=; b=T/TEKf72WA77Z9sbFV72KP/oSud277t0SMkKyEXA+DoExRR2K0TMHrseTOZkUNfuMI iFZYYRoKZ5fVrXALpvDuwPEiiryHM1nXPaThD/2oERZ3R6uGAkJxXmqnWF8d7CyBSFil oQd1m9GqziUcKDRdyMIpclDYsk+kaBbMItXl8/7GvmlxoLzvprzbaSzBCdEyYZSEixOD Htt0SV63f6+i31s7+QDa6JJoaX93rODPwfs8oLkFCQ7HMTTnWhnlpTiW/WKP4UEoXhMM hpfNTfnYerBuK3lHIh3bgrNcp329Y7L1onTGt0D+LmfATY1Mg2CsXO4DSpFmqoAVIcEm r/FA== X-Gm-Message-State: APjAAAWSHVcHkgowuhWFJoPc6tVfRqVu++0mHvz/ECwbwJQNtMjDQNbG ajjbteE1BNFOzKwFKxEdyGw= X-Google-Smtp-Source: APXvYqzk8q09MkFlb20CVYp/86I8xBlZqn7GyJdihlDGIuYEKyNzHY01wi0Ua1eyQvdVyWd6VcB/sg== X-Received: by 2002:a17:90a:e28e:: with SMTP id d14mr11094484pjz.56.1582140566380; Wed, 19 Feb 2020 11:29:26 -0800 (PST) Received: from [10.128.13.33] ([118.127.110.110]) by smtp.gmail.com with ESMTPSA id 64sm414835pfd.48.2020.02.19.11.29.23 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 19 Feb 2020 11:29:25 -0800 (PST) Sender: Tony Li Content-Type: text/plain; charset=us-ascii Mime-Version: 1.0 (Mac OS X Mail 12.4 \(3445.104.11\)) From: tony.li@tony.li In-Reply-To: Date: Thu, 20 Feb 2020 06:29:21 +1100 Cc: Peter Psenak , "lsr@ietf.org" Content-Transfer-Encoding: quoted-printable Message-Id: References: <5b430357-56ad-2901-f5a8-c0678a507293@cisco.com> <4FC90EB2-D355-4DC5-8365-E5FBE037954E@gmail.com> To: Les Ginsberg X-Mailer: Apple Mail (2.3445.104.11) Archived-At: Subject: Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 19 Feb 2020 19:29:28 -0000 Les, > As you need to send signaling based upon dynamic receiver state and = this signaling is contained in unreliable PDUs (hellos) and to be useful = this signaling needs to be sent ASAP - you cannot wait until the next = periodic hello interval (default 10 seconds) to expire. So you are going = to have to introduce extra hello traffic at a time when protocol input = queues are already stressed. I am not proposing that we add additional packets at this time. Yes, I = realize that it may limit the effectiveness of the feedback, but without = serious experimentation, the cure may be worse than the disease. I = propose to tread very carefully. > Given hellos are unreliable, the question of how many transmissions of = the update flow info is enough arises. You could make this more = deterministic by enhancing the new TLV to include information received = from the neighbor so that each side would know when the neighbor had = received the updated info. This then requires additional hellos be sent = in both directions - which exacerbates the queue issues on both receiver = and transmitter. I am not proposing this. If the hello is lost, then the transmitter has = less information to work with, which is not an unreasonable situation. Tony From nobody Wed Feb 19 11:42:23 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 0B283120130 for ; Wed, 19 Feb 2020 11:42:21 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -14.502 X-Spam-Level: X-Spam-Status: No, score=-14.502 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIMWL_WL_MED=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, RCVD_IN_DNSWL_HI=-5, 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 w2M_DxrUDfRJ for ; Wed, 19 Feb 2020 11:42:19 -0800 (PST) Received: from aer-iport-3.cisco.com (aer-iport-3.cisco.com [173.38.203.53]) (using TLSv1.2 with cipher DHE-RSA-SEED-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id F0306120112 for ; Wed, 19 Feb 2020 11:42:18 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=1208; q=dns/txt; s=iport; t=1582141339; x=1583350939; h=subject:to:cc:references:from:message-id:date: mime-version:in-reply-to:content-transfer-encoding; bh=0wMUOjmE55+K7CDNXKmRVNy5ryq0pU57WLXC/ZcRm6c=; b=esHb9Q8uLeHpPzirnqjRGvCmB/oC0xsBWr29HIDz2TBe5/xEYvBO8CMf EwULaQfJH415fLp10y70QhGyhx817fS4CKIF9JYOXf2Np5olHTtyUjEOu d5rlJZl2lUmRbBTH9LMtaNekEjljy47xa0Xs45W5Np/PhNDBq2lx6SdJe o=; X-IronPort-AV: E=Sophos;i="5.70,461,1574121600"; d="scan'208";a="21192589" Received: from aer-iport-nat.cisco.com (HELO aer-core-3.cisco.com) ([173.38.203.22]) by aer-iport-3.cisco.com with ESMTP/TLS/DHE-RSA-SEED-SHA; 19 Feb 2020 19:42:17 +0000 Received: from [10.60.140.53] (ams-ppsenak-nitro4.cisco.com [10.60.140.53]) by aer-core-3.cisco.com (8.15.2/8.15.2) with ESMTP id 01JJgG6c032388; Wed, 19 Feb 2020 19:42:16 GMT To: tony.li@tony.li Cc: Les Ginsberg , "lsr@ietf.org" References: <5b430357-56ad-2901-f5a8-c0678a507293@cisco.com> <4FC90EB2-D355-4DC5-8365-E5FBE037954E@gmail.com> <4D5A06BB-0522-4FB5-B783-4AD7C78F8EC0@tony.li> From: Peter Psenak Message-ID: <09b937e6-c32d-416a-5111-e7510660d8d7@cisco.com> Date: Wed, 19 Feb 2020 20:42:16 +0100 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:60.0) Gecko/20100101 Thunderbird/60.7.0 MIME-Version: 1.0 In-Reply-To: <4D5A06BB-0522-4FB5-B783-4AD7C78F8EC0@tony.li> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit X-Outbound-SMTP-Client: 10.60.140.53, ams-ppsenak-nitro4.cisco.com X-Outbound-Node: aer-core-3.cisco.com Archived-At: Subject: Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 19 Feb 2020 19:42:21 -0000 Tony, On 19/02/2020 20:25, tony.li@tony.li wrote: > > Peter, > >> I'm not scared of polynomial evaluation, but the fact that my IGP >> implementation is dependent on the PD specifics, which are not >> generally available and need to be custom built for each PD >> specifically. I always thought a good IGP implementation is PD agnostic. > > > Your implementation is always dependent on the underlying hardware.  We > have timers, we have filesystems, we have I/O subsystems, threads, and > clocks to contend with. none of the above is dependent on the LC specific hardware. > The input queue in the hardware is a fact of > life and knowing about it can improve our implementations. > > Because the PD layer can provide isolation from the specifics, the IGP > implementation is reasonably abstracted from those specifics, in much > the same way that the OS has abstracted us from the remainder of the > underlying hardware. All I’m proposing is adding one more item to that > PD abstraction. easy to say with a single PD. If you have 20, each with a different architecture, it becomes a different problem. thanks, Peter > > Regards, > Tony > From nobody Wed Feb 19 11:59:53 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 66E26120948 for ; Wed, 19 Feb 2020 11:59:45 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.4 X-Spam-Level: X-Spam-Status: No, score=-1.4 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, FREEMAIL_FORGED_FROMDOMAIN=0.249, FREEMAIL_FROM=0.001, HEADER_FROM_DIFFERENT_DOMAINS=0.25, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001] autolearn=no autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id LBjt7PQV2TPP for ; Wed, 19 Feb 2020 11:59:44 -0800 (PST) Received: from mail-pg1-x52e.google.com (mail-pg1-x52e.google.com [IPv6:2607:f8b0:4864:20::52e]) (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 20510120900 for ; Wed, 19 Feb 2020 11:59:44 -0800 (PST) Received: by mail-pg1-x52e.google.com with SMTP id w21so623968pgl.9 for ; Wed, 19 Feb 2020 11:59:44 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=sender:mime-version:subject:from:in-reply-to:date:cc :content-transfer-encoding:message-id:references:to; bh=C/8ya9u1A6ITZ4L9pWTkZcf10kR7KZp96QafpLBObn0=; b=a5P8qLw62/f0POTDDmP8fWDgVJyEFlvz+aHWRwKV/4zV81s+pudN6huB4yHF6InJQW YsE0/qylVpxYDaTJqVoejVTOkVYWl6kSsZhgAvquLqODYtFudmNWOxQ7ofreLKyGeHzn XzUbZYnKJ+jViiEtzFXBd//naJVFKPQHWA3n157C/nZfniyIQk8dN9lny+2apwZlyI1h A8OvkQoDbcJa/u3/dwnatqa3V4Y5zNU1kUQ4k3E4mni3U87Gc4b+jNycjcpqtP6vy/eE 3/yewIJWK+M6CK4euobh6EMe169EG8/GgGWKhybM+sZLu/eHjJ9RpkNKQmyeTUAtDxWM JmmQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:mime-version:subject:from:in-reply-to :date:cc:content-transfer-encoding:message-id:references:to; bh=C/8ya9u1A6ITZ4L9pWTkZcf10kR7KZp96QafpLBObn0=; b=FVtaNc+tPj6Tijr+NEd6GDOR/gWthIkPcXSWtWuQyDhq07r85EwgHfMP5KGAoGtqxe 9eXEXtAZWzd1Aey+qrC/GdPKPGVqecDCq/uIhdWT5U1fj2VVIAZiRezWPr6E91HsDxfC uwmF8klvIQ59auw5qb7WitK4+t4TEDEz5bgM/38Pe+CWVhomYmvxSRSxMga/blPU5fn/ +55tmSbkhKH1U9dcGqO8BI1Ir9KnASyERlHqSTFMEHCPttMOjQ+SiIYvLcd1hkIHD/DE pLsf/sO0mkrjX1sZXdUb6ctq5NorfP5NXMUZ2scw4pahm26FG/r/b1v5H83vjqhAX2cu owYA== X-Gm-Message-State: APjAAAVFTSmWNtGf0cCSY/aMqNUP4rmablOxFbDPrfmESKhMm19OtoH6 Ew8ns9eOPTC4rSzJtPZrwts= X-Google-Smtp-Source: APXvYqxJ6ZGrwwDg06lBeDxIgYn16rYR13DF2ttVmqIn/IZOL7hHym+nsfa82mPHUZTHBDFhaxFCfg== X-Received: by 2002:a65:420c:: with SMTP id c12mr28364346pgq.270.1582142383641; Wed, 19 Feb 2020 11:59:43 -0800 (PST) Received: from [10.128.13.33] ([118.127.110.110]) by smtp.gmail.com with ESMTPSA id x26sm456740pfq.55.2020.02.19.11.59.41 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 19 Feb 2020 11:59:42 -0800 (PST) Sender: Tony Li Content-Type: text/plain; charset=utf-8 Mime-Version: 1.0 (Mac OS X Mail 12.4 \(3445.104.11\)) From: tony.li@tony.li In-Reply-To: <09b937e6-c32d-416a-5111-e7510660d8d7@cisco.com> Date: Thu, 20 Feb 2020 06:59:39 +1100 Cc: Les Ginsberg , "lsr@ietf.org" Content-Transfer-Encoding: quoted-printable Message-Id: References: <5b430357-56ad-2901-f5a8-c0678a507293@cisco.com> <4FC90EB2-D355-4DC5-8365-E5FBE037954E@gmail.com> <4D5A06BB-0522-4FB5-B783-4AD7C78F8EC0@tony.li> <09b937e6-c32d-416a-5111-e7510660d8d7@cisco.com> To: Peter Psenak X-Mailer: Apple Mail (2.3445.104.11) Archived-At: Subject: Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 19 Feb 2020 19:59:51 -0000 > easy to say with a single PD. If you have 20, each with a different = architecture, it becomes a different problem. My employer has multiple PD implementations. I sympathize, but it=E2=80=99= s still necessary. Tony From nobody Wed Feb 19 12:53:37 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id C96F2120810 for ; Wed, 19 Feb 2020 12:53:35 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -14.501 X-Spam-Level: X-Spam-Status: No, score=-14.501 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, RCVD_IN_DNSWL_HI=-5, 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 header.b=C/IG2PZZ; dkim=pass (1024-bit key) header.d=cisco.onmicrosoft.com header.b=pKtDWE3T 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 RaSUfu_psOO6 for ; Wed, 19 Feb 2020 12:53:33 -0800 (PST) Received: from alln-iport-5.cisco.com (alln-iport-5.cisco.com [173.37.142.92]) (using TLSv1.2 with cipher DHE-RSA-SEED-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 03761120128 for ; 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Wed, 19 Feb 2020 20:53:29 +0000 From: "Les Ginsberg (ginsberg)" To: "tony.li@tony.li" CC: "Peter Psenak (ppsenak)" , "lsr@ietf.org" Thread-Topic: [Lsr] Flow Control Discussion for IS-IS Flooding Speed Thread-Index: AdXmy57fbkJZPBB7TgK3RmmTteJ+KgABmiUAAAXBVGAAALvbAAAADcCwAADjzIAAAE+xoAACI1mAAAI47oAAAS4LAAAAfQaAAAAcA4AAAMOnAAABAHOAAABnkAAADqtI8AADfgiAAAJAWiA= Date: Wed, 19 Feb 2020 20:53:29 +0000 Message-ID: References: <5b430357-56ad-2901-f5a8-c0678a507293@cisco.com> <4FC90EB2-D355-4DC5-8365-E5FBE037954E@gmail.com> 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=ginsberg@cisco.com; x-originating-ip: [2001:420:c0c8:1005::756] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: a2c2ddad-b719-49c2-fc8f-08d7b57dc61a x-ms-traffictypediagnostic: MW3PR11MB4649: x-ms-exchange-transport-forked: True x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:10000; 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charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-MS-Exchange-CrossTenant-Network-Message-Id: a2c2ddad-b719-49c2-fc8f-08d7b57dc61a X-MS-Exchange-CrossTenant-originalarrivaltime: 19 Feb 2020 20:53:29.5122 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 5ae1af62-9505-4097-a69a-c1553ef7840e X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: MBio1Yz8xvaj6ElYrOT5bIlbdg4P2zjTKzLTG7z9biLMefbs3WCriE0JxVWQaR8FMl8bi2TJvk/pfDTkRpnrfg== X-MS-Exchange-Transport-CrossTenantHeadersStamped: MW3PR11MB4649 X-OriginatorOrg: cisco.com X-Outbound-SMTP-Client: 173.36.7.15, xch-aln-005.cisco.com X-Outbound-Node: rcdn-core-6.cisco.com Archived-At: Subject: Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 19 Feb 2020 20:53:36 -0000 Tony - With respect, it is hard to know what you are proposing since there has nev= er been a public description. The draft on which you are a co-author does not discuss any sort of algorit= hm to dynamically alter the advertised value based on current router state.= In fact it argues (or at least suggests) that this shouldn't be done. Sect= ion 5 states: " ... a reasonable choice might be for a node to use a formula based on an off line tests of the overall LSPDU processing speed for a particular set of hardware and the number of interfaces configured for IS-IS. With such a formula, the values advertised in the Flooding Speed TLV would only change when additional IS-IS interfaces are configured. On the other hand, it would be undesirable to use a formula that depends, for example, on an active measurement of the CPU load to modify the values advertised in the Flooding Speed TLV..." Apparently you have a different idea, which maybe the next version of draft= -decraene will include, but right now all we have as a description is a ser= ies of isolated sentences in multiple emails. You'll have to forgive me if = I am not always clear about what you intend but have yet to state. Inline. > -----Original Message----- > From: Tony Li On Behalf Of tony.li@tony.li > Sent: Wednesday, February 19, 2020 11:29 AM > To: Les Ginsberg (ginsberg) > Cc: Peter Psenak (ppsenak) ; lsr@ietf.org > Subject: Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed >=20 >=20 > Les, >=20 > > As you need to send signaling based upon dynamic receiver state and thi= s > signaling is contained in unreliable PDUs (hellos) and to be useful this > signaling needs to be sent ASAP - you cannot wait until the next periodic > hello interval (default 10 seconds) to expire. So you are going to have t= o > introduce extra hello traffic at a time when protocol input queues are al= ready > stressed. >=20 >=20 > I am not proposing that we add additional packets at this time. Yes, I r= ealize > that it may limit the effectiveness of the feedback, but without serious > experimentation, the cure may be worse than the disease. I propose to > tread very carefully. >=20 >=20 [Les:] So you intend to simply update the feedback in the next scheduled he= llo? If so, this is interesting choice. The occurrence of high flooding rates is an infrequent event. When it occur= s, it will persist for some finite amount of time - which with higher flood= ing rates we hope will be modest - in the 10s of seconds or less. If you aren't going to signal "slow down" for up to 10 seconds, the impact = of the control is significantly diminished. This is another significant difference relative to the TCP analogy. For a = TCP session it is quite reasonable to expect that high sustained throughput= is desired for long periods of time. For IGP flooding, high sustained throughput occurs rarely - and is of limit= ed duration. Les > > Given hellos are unreliable, the question of how many transmissions of = the > update flow info is enough arises. You could make this more deterministic= by > enhancing the new TLV to include information received from the neighbor s= o > that each side would know when the neighbor had received the updated > info. This then requires additional hellos be sent in both directions - w= hich > exacerbates the queue issues on both receiver and transmitter. >=20 >=20 > I am not proposing this. If the hello is lost, then the transmitter has = less > information to work with, which is not an unreasonable situation. >=20 > Tony From nobody Wed Feb 19 14:01:28 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id A1DFF12022E for ; Wed, 19 Feb 2020 14:01:26 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -14.5 X-Spam-Level: X-Spam-Status: No, score=-14.5 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, 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 header.b=IiK80kTW; dkim=pass (1024-bit key) header.d=cisco.onmicrosoft.com header.b=hSnvh8Os Received: from mail.ietf.org ([4.31.198.44]) by localhost 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APjAAAVCWVK4bjnIV2iSzhpXdwv1iW5DDBhdkugWx0ZpJgXdXa9JLurh 91SeudipCa2+pV/5xyaWCk+lS/5A6Ye7NF3yxE2uBW4p X-Google-Smtp-Source: APXvYqymPr5RppBpxbHAozVOv1TXpEiQWJW2zLqYpYIqfsTE/0YDxZMtRHIAGXuaReVunIw88C3YF6nMZVa6VzQbh1k= X-Received: by 2002:a02:cc75:: with SMTP id j21mr22597497jaq.113.1582158077054; Wed, 19 Feb 2020 16:21:17 -0800 (PST) MIME-Version: 1.0 References: <5b430357-56ad-2901-f5a8-c0678a507293@cisco.com> <4FC90EB2-D355-4DC5-8365-E5FBE037954E@gmail.com> In-Reply-To: From: Tony Przygienda Date: Wed, 19 Feb 2020 16:20:21 -0800 Message-ID: To: "Les Ginsberg (ginsberg)" Cc: "Peter Psenak (ppsenak)" , Tony Li , "lsr@ietf.org" , "tony.li@tony.li" Content-Type: multipart/alternative; boundary="0000000000002956cb059ef6e287" Archived-At: Subject: Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 20 Feb 2020 00:21:23 -0000 --0000000000002956cb059ef6e287 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable My sense of humor to be excused, Les =F0=9F=98=97=F0=9F=98=81 Yes, so here's suggestion taht will build a better sloped hysteresis that will allow you to ramp up slower first to not oscillate and also ramp down somewhat more graciously. It's a sketch, more interesting metrics can be taken into it further but that's the flavor good enough for the draft IMO. holding down on timer is better achieved by 'normalizing' by exponential decay on every tick that 'primes' to max rate over time when nothing is happening. Queue lengths except somle low/high watermark that stops/starts sending are quite misleading IME given that queue length is not very meaningful unless one can measure producer/consumer rates and those depend largely on CPU cycles available & memory congestion and can be very, very bursty. And all the queues involved as well to an extent (IME in halfway non-trivial architecture @ least 3 of those in- and out- the box). MaxAllowedEver/sec =3D maximum rate ever allowed (constant) MinAllowedEver/sec =3D minimum rate ever allowed (constant) MaxAllowedRate/sec =3D maximum packets (CSNP/PSNP/LSP) allowed out the interface per sec CurrentRate/sec =3D packets sent out this second Re-TX/sec =3D retransmissions this second per every second tic: if Re-TX { CurrentRate/sec =3D max(MinAllowedEver, CurrentRate - 30% ) // slope do= wn fast on re-tx } if CurrentRate/sec >=3D MaxAllowedRate/sec { MaxAllowedRate/sec =3D min(MaxAllowedEver, MaxAllowedRate + 20%) // when under load slope up fast } else { MaxAllowedRate/sec +=3D min(MaxAllowedRate, CurrentRate + 5%) // slowly normalizes even if no traffic } What you write about ack'ing only is dangerous and can seriously affect the protocol. If you're holding newer LSPs than the ones received ack'ing old versions is not helpful. one should flood back newer stuff. Generally it is better to run proper WFQ per type and not just start send one type of packets since that can hit ugly corner conditions in flooding & starve it IME if the queues get long enough one can't drain them in a sec tic. hope that's precise & lucid enough without smothering folks with too much detail ... --- tony On Wed, Feb 19, 2020 at 2:01 PM Les Ginsberg (ginsberg) wrote: > Tony =E2=80=93 > > > > If you have a suggestion for Tx back-off algorithm please feel free to > share. > > The proposal in the draft is just a suggestion. > > As this is a local matter there is no interoperability issue, but > certainly documenting a better algorithm is worthwhile. > > > > Les (claws in check =F0=9F=98=8A ) > > > > > > *From:* Tony Przygienda > *Sent:* Wednesday, February 19, 2020 11:25 AM > *To:* Les Ginsberg (ginsberg) > *Cc:* Peter Psenak (ppsenak) ; Tony Li < > tony1athome@gmail.com>; lsr@ietf.org; tony.li@tony.li > *Subject:* Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed > > > > Having worked for last couple of years on implementation of flooding > speeds that converge LSDBs some order of magnitudes above today's speeds > ;-) here's a bunch of observations > > > > 1. TX side is easy and useful. My observation having gone quickly over th= e > -ginsberg- draft is that you really want a better hysterisis there, it's > bit too vertical and you will generate oscillations rather than walk arou= nd > the equilibrium ;-) > > 2. Queue per interface is fairly trivial with modern implementation > techniques and memory sizes if done correctly. Yes, very memory constrain= ed > platforms are a mildly different game and kind of precondition a differen= t > discussion. > > 3. RX side is possible and somewhat useful but much harder to do well > depending on flavor. If we're talking about the RX advertising a very > static value to cap the flooding speed that's actually a useful knob to > have IMO/IME. Trying to cleverly communicate to the TXer a window size is > not only fiendishly difficult, incurs back propagation speed (not > neglectible @ those rates IME) but can easily lead to subtle flood > starvation behaviors and lots of slow starts due to mixture of control lo= op > dynamics and implementation complexity of such a scheme. Though, giving t= he > TXer some hint that a backpressure is desired is however not a bad thing > IME and can be derived failry easily without needs for checking queue siz= es > and so on. It's observable by looking @ some standard stats on what is > productive incoming rate on the interface. Anything smarter needs new TLV= s > on packets & then you have a problem under/oversampling based on hellos > (too low a frequency) and ACKs (too bursty, too batchy) and flooded back > LSPs (too unpredictable) > > > > For more details I can recommend rift draft of course ;-) > > > > otherwise I'm staying out from this mildly feline spat ;-) > > > > --- tony > > > > On Wed, Feb 19, 2020 at 9:59 AM Les Ginsberg (ginsberg) < > ginsberg@cisco.com> wrote: > > Tony - > > Peter has a done a great job of highlighting that "single queue" is an > oversimplification - I have nothing to add to that discussion. > > I would like to point out another aspect of the Rx based solution. > > As you need to send signaling based upon dynamic receiver state and this > signaling is contained in unreliable PDUs (hellos) and to be useful this > signaling needs to be sent ASAP - you cannot wait until the next periodic > hello interval (default 10 seconds) to expire. So you are going to have t= o > introduce extra hello traffic at a time when protocol input queues are > already stressed. > > Given hellos are unreliable, the question of how many transmissions of th= e > update flow info is enough arises. You could make this more deterministic > by enhancing the new TLV to include information received from the neighbo= r > so that each side would know when the neighbor had received the updated > info. This then requires additional hellos be sent in both directions - > which exacerbates the queue issues on both receiver and transmitter. > > It is true (of course) that hellos should be treated with higher priority > than other PDUs, but this does not mean that the additional hellos have n= o > impact on the queue space available for LSPs/SNPs. > > Also, it seems like you are proposing interface independent logic, so you > will be adjusting flow information on all interfaces enabled for IS-IS, > which means that additional hello traffic will occur on all interfaces. A= t > scale this is concerning. > > Les > > > > -----Original Message----- > > From: Peter Psenak > > Sent: Wednesday, February 19, 2020 2:49 AM > > To: Tony Li > > Cc: Les Ginsberg (ginsberg) ; tony.li@tony.li; > > lsr@ietf.org > > Subject: Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed > > > > Tony, > > > > On 19/02/2020 11:37, Tony Li wrote: > > > Peter, > > > > > >> I'm aware of the PD layer and that is not the issue. The problem is > that > > there is no common value to report across different PD layers, as each > > architecture may have different number of queues involved, etc. Trying = to > > find a common value to report to IPGs across various PDs would involve > > some PD specific logic and that is the part I'm referring to and I woul= d > like > > NOT to get into. > > > > > > > > > I=E2=80=99m sorry that scares you. It would seem like an initial > implementation > > might be to take the min of the free space of the queues leading from t= he > > >interface to the CPU. I grant you that some additional sophistication > may be > > necessary, but I suspect that this is not going to become more > >complicated > > than polynomial evaluation. > > > > I'm not scared of polynomial evaluation, but the fact that my IGP > > implementation is dependent on the PD specifics, which are not generall= y > > available and need to be custom built for each PD specifically. I alway= s > > thought a good IGP implementation is PD agnostic. > > > > thanks, > > Peter > > > > > > > > Tony > > > > > > _______________________________________________ > > > Lsr mailing list > > > Lsr@ietf.org > > > https://www.ietf.org/mailman/listinfo/lsr > > > > > > > > _______________________________________________ > Lsr mailing list > Lsr@ietf.org > https://www.ietf.org/mailman/listinfo/lsr > > --0000000000002956cb059ef6e287 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
My sense of humor to be excused, Les =F0=9F=98=97=F0= =9F=98=81

Yes, so here's suggestion taht will = build a better sloped hysteresis that will allow you to ramp up slower firs= t to not oscillate and also ramp down somewhat more graciously. It's a = sketch, more interesting metrics can be taken into it further but that'= s the flavor good enough for the draft IMO. holding down on timer is better= achieved by 'normalizing' by exponential decay on every tick that = 'primes' to max rate over time when nothing is happening.=C2=A0 Que= ue lengths except somle low/high watermark that stops/starts sending are qu= ite misleading IME given that queue length is not very meaningful unless on= e can measure producer/consumer rates and those depend largely on CPU cycle= s available & memory congestion and can be very, very bursty. And all t= he queues involved as well to an extent (IME in halfway non-trivial archite= cture @ least 3 of those in- and out- the box).

MaxAllowedEver/sec =3D maximum rate ever allowed (constant)
MinAllowedEver/sec =3D minimum rate ever allowed (constant)
<= div>MaxAllowedRate/sec =3D maximum packets (CSNP/PSNP/LSP) allowed out the = interface per sec
CurrentRate/sec =3D packets sent out this secon= d
Re-TX/sec =3D retransmissions this second

<= div>per every second tic:

if Re-TX {
=C2=A0=C2=A0=C2=A0 CurrentRate/sec =3D max(MinAllowedEver,=C2=A0Curre= ntRate - 30% ) // slope down fast on re-tx
}
<= br>
if CurrentRate/sec >=3D MaxAllowedRate/sec {
=C2=A0 MaxAllowedRate/sec =3D min(MaxAllowedEver, MaxAllowedRate + 20%) /= / when under load slope up fast
} else {
=C2=A0 Max= AllowedRate/sec +=3D min(MaxAllowedRate, CurrentRate + 5%) // slowly normal= izes even if no traffic
}

What = you write about ack'ing only is dangerous and can seriously affect the = protocol. If you're holding newer LSPs than the ones received ack'i= ng old versions is not helpful. one should flood back newer stuff. Generall= y it is better to run proper WFQ per type and not just start send one type = of packets since that can hit ugly corner conditions in flooding & star= ve it IME if the queues get long enough one can't drain them in a sec t= ic.

hope that's precise & lucid enoug= h without smothering folks with too much detail ...

--- tony
=C2=A0




On Wed, Feb 19, 2020 at 2:01 PM Les Ginsberg (ginsberg) <ginsberg@cisco.com> wrote:

Tony =E2=80=93

=C2=A0

If you have a suggestion for Tx back-off algorithm p= lease feel free to share.

The proposal in the draft is just a suggestion.

As this is a local matter there is no interoperabili= ty issue, but certainly documenting a better algorithm is worthwhile.

=C2=A0

=C2=A0=C2=A0 Les (claws in check =F0=9F=98=8A )

=C2=A0

=C2=A0

From: Tony Przygienda <tonysietf@gmail.com>
Sent: Wednesday, February 19, 2020 11:25 AM
To: Les Ginsberg (ginsberg) <ginsberg@cisco.com>
Cc: Peter Psenak (ppsenak) <ppsenak@cisco.com>; Tony Li <tony1athome@gmail.com>; lsr@ietf.org; tony.li@tony.li
Subject: Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed<= u>

=C2=A0

Having worked for last couple of years on implementa= tion of flooding speeds that converge LSDBs some order of magnitudes above = today's speeds=C2=A0 ;-) here's a bunch of observations

=C2=A0

1. TX side is easy and useful. My observation having= gone quickly over the -ginsberg- draft is that you really want a better hy= sterisis there, it's bit too vertical and you will generate oscillation= s rather than walk around the equilibrium ;-)

2. Queue per interface is fairly trivial with modern= implementation techniques and memory sizes if done correctly. Yes, very me= mory constrained platforms are a mildly different game and kind of precondi= tion a different discussion.

3. RX side is possible and somewhat useful but much = harder to do well depending on flavor. If we're talking about the RX ad= vertising a very static value to cap the flooding speed that's actually= a useful knob to have IMO/IME. Trying to cleverly communicate to the TXer a window size is not only fiendishly diff= icult, incurs back propagation speed (not neglectible @ those rates IME) bu= t can easily lead to subtle flood starvation behaviors and lots of slow sta= rts due to mixture of control loop dynamics and implementation complexity of such a scheme. Though, giving th= e TXer some hint that a backpressure is desired is however not a bad thing = IME and can be derived failry easily without needs for checking queue sizes= and so on. It's observable by looking @ some standard stats on what is productive incoming rate on the interface= . Anything smarter needs new TLVs on packets & then you have a problem = under/oversampling based on hellos (too low a frequency) and ACKs (too burs= ty, too batchy) and flooded back LSPs (too unpredictable)

=C2=A0

For more details I can recommend rift draft of cours= e ;-)

=C2=A0

otherwise I'm staying out from this mildly felin= e spat ;-)

=C2=A0

--- tony

=C2=A0

On Wed, Feb 19, 2020 at 9:59 AM Les Ginsberg (ginsbe= rg) <ginsberg@ci= sco.com> wrote:

Tony -

Peter has a done a great job of highlighting that "single queue" = is an oversimplification - I have nothing to add to that discussion.

I would like to point out another aspect of the Rx based solution.

As you need to send signaling based upon dynamic receiver state and this si= gnaling is contained in unreliable PDUs (hellos) and to be useful this sign= aling needs to be sent ASAP - you cannot wait until the next periodic hello= interval (default 10 seconds) to expire. So you are going to have to introduce extra hello traffic at a tim= e when protocol input queues are already stressed.

Given hellos are unreliable, the question of how many transmissions of the = update flow info is enough arises. You could make this more deterministic b= y enhancing the new TLV to include information received from the neighbor s= o that each side would know when the neighbor had received the updated info. This then requires additional = hellos be sent in both directions - which exacerbates the queue issues on b= oth receiver and transmitter.

It is true (of course) that hellos should be treated with higher priority t= han other PDUs, but this does not mean that the additional hellos have no i= mpact on the queue space available for LSPs/SNPs.

Also, it seems like you are proposing interface independent logic, so you w= ill be adjusting flow information on all interfaces enabled for IS-IS, whic= h means that additional hello traffic will occur on all interfaces. At scal= e this is concerning.

=C2=A0 =C2=A0Les


> -----Original Message-----
> From: Peter Psenak <ppsenak@cisco.com>
> Sent: Wednesday, February 19, 2020 2:49 AM
> To: Tony Li <tony1athome@gmail.com>
> Cc: Les Ginsberg (ginsberg) <ginsberg@cisco.com>; tony.li@tony.li; > lsr@ietf.org
> Subject: Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed >
> Tony,
>
> On 19/02/2020 11:37, Tony Li wrote:
> > Peter,
> >
> >> I'm aware of the PD layer and that is not the issue. The = problem is that
> there is no common value to report across different PD layers, as each=
> architecture may have different number of queues involved, etc. Trying= to
> find a common value to report to IPGs across various PDs would involve=
> some PD specific logic and that is the part I'm referring to and I= would like
> NOT to get into.
> >
> >
> > I=E2=80=99m sorry that scares you.=C2=A0 It would seem like an in= itial implementation
> might be to take the min of the free space of the queues leading from = the
> >interface to the CPU. I grant you that some additional sophisticat= ion may be
> necessary, but I suspect that this is not going to become more >com= plicated
> than polynomial evaluation.
>
> I'm not scared of polynomial evaluation, but the fact that my IGP<= br> > implementation is dependent on the PD specifics, which are not general= ly
> available and need to be custom built for each PD specifically. I alwa= ys
> thought a good IGP implementation is PD agnostic.
>
> thanks,
> Peter
>
> >
> > Tony
> >
> > _______________________________________________
> > Lsr mailing list
> > Lsr@ietf.org
> > https://www.ietf.org/mailman/listinfo/lsr
> >
> >

_______________________________________________
Lsr mailing list
Lsr@ietf.org
htt= ps://www.ietf.org/mailman/listinfo/lsr

--0000000000002956cb059ef6e287-- From nobody Thu Feb 20 07:08:57 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id A182612003E for ; Thu, 20 Feb 2020 07:08:55 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -0.95 X-Spam-Level: X-Spam-Status: No, score=-0.95 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DATE_IN_PAST_12_24=1.049, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, FREEMAIL_FROM=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001] autolearn=no autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 4Wt4ws4ZlT3b for ; Thu, 20 Feb 2020 07:08:54 -0800 (PST) Received: from mail-pj1-x1029.google.com (mail-pj1-x1029.google.com [IPv6:2607:f8b0:4864:20::1029]) (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 B0B69120024 for ; Thu, 20 Feb 2020 07:08:54 -0800 (PST) Received: by mail-pj1-x1029.google.com with SMTP id gv17so1010982pjb.1 for ; Thu, 20 Feb 2020 07:08:54 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=content-transfer-encoding:from:mime-version:subject:date:message-id :references:cc:in-reply-to:to; bh=9IdTiUDH74Wi2ODNKp/LMxCwkucSYyUY9wUvHsS+nY4=; b=IDJZuy7FglvQ9oa+JML8T2FgUS1OWbAUVp43WV0a9q0XcndNvUj9Om+gyvpiuqEJpB CjoXijY1CGcH6X3In8S9H7fYA1G+UxM4jZioxlqq+s11AQrRQV7gitIXezQ63ujCnsDh KWppBAjeFpGDAS0je6Pmy3zjGiuqM7LJLj/fOdpMF5YWRfVa63PyX33vIYrXjeOGmKvg GYRdkauYeyEF4Be0F0Q9A8Js+8wcoVIyzv0Ao1GP527LG7BArY2xXLgXTgBxhgnxuT5B V5yX5Gfvp2JIGfAds5vVfy9g8Io5F8fUcfcAGdd3kYcz7dy2Ki9IOPgBppsmLZLVOAeS FeTg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:content-transfer-encoding:from:mime-version :subject:date:message-id:references:cc:in-reply-to:to; bh=9IdTiUDH74Wi2ODNKp/LMxCwkucSYyUY9wUvHsS+nY4=; b=jT5ZOrM26jdDTSscRQ1RefnIapYEG7MmSHLIbxNH7cspvjEMs0sd2Kln8R/oviYVF9 SyAC2xW9+cL9xAXVrZ4YoNzM+JwV6iQb7MkemrxFiD4GJ1VrxosSbAeJ9vS8PrCnbAEw FB+keT60Pl6L7zNoi3HBbsjtfpDkxHQya4VWR5kWmDSNuyC5R08jp6Ka3CRSFz1P7Nho ek37PClLlKtuWb2O4YKREm5bp2Yxg3FCQeCG5FtdK6pg1EdXmoHN0ZRWz+L3WhszTh2N dUHwW7MKh2rNjtQyWK5k+GqOME3l7dQhSQIbQ2/YXiFuQJTJzDpYDYk/4WjmtKW0aoD9 hDjQ== X-Gm-Message-State: APjAAAVL4BH4sRTR/X3/lr7hD/R4GSzNaS3VK1pqw5IisNI9nge56PZw ES9SV0TnxXc9tsodawwPS7E= X-Google-Smtp-Source: APXvYqxKo/bSVv7vbxhuiS+NMf4BnWMpLGn/JoGH0wFotkbDxZGsglmU1BOglbJ3v6YEuWqRbGH+LQ== X-Received: by 2002:a17:902:9b93:: with SMTP id y19mr31385245plp.89.1582211333939; Thu, 20 Feb 2020 07:08:53 -0800 (PST) Received: from [172.31.114.48] ([216.9.110.11]) by smtp.gmail.com with ESMTPSA id b18sm3972030pfb.116.2020.02.20.07.08.51 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 20 Feb 2020 07:08:52 -0800 (PST) Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable From: Tony Li Mime-Version: 1.0 (1.0) Date: Thu, 20 Feb 2020 09:58:56 +1100 Message-Id: <44C0C3E0-CA5C-48BA-8F0A-EC9886F3ED13@gmail.com> References: Cc: "tony.li@tony.li" , "Peter Psenak (ppsenak)" , "lsr@ietf.org" In-Reply-To: To: "Les Ginsberg (ginsberg)" X-Mailer: iPad Mail (17D50) Archived-At: Subject: Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 20 Feb 2020 15:08:56 -0000 Les, > With respect, it is hard to know what you are proposing since there has ne= ver been a public description. With respect, I=E2=80=99ve said it many times, both in person and in email. Y= ou need to hear it again? Sure. > The draft on which you are a co-author does not discuss any sort of algori= thm to dynamically alter the advertised value based on current router state.= In fact it argues (or at least suggests) that this shouldn't be done. I=E2=80=99m suggesting being more dynamic than what that draft advocates. > Apparently you have a different idea, which maybe the next version of draf= t-decraene will include, but right now all we have as a description is a ser= ies of isolated sentences in multiple emails. You'll have to forgive me if I= am not always clear about what you intend but have yet to state. Again, what I=E2=80=99m suggesting is that the LSP receiver use a TLV (possi= bly Bruno=E2=80=99s, possibly tweaked) to tell the LSP transmitter the curre= nt space in the input packet queue. As previously described, we may want to c= onsider oversubscription when advertising this value. This MAY be included i= n IIH=E2=80=99s and SNP=E2=80=99s, piggy backed on existing transmissions.=20= The LSP transmitter MAY use this information, in conjunction with the knowle= dge of unacknowledged LSPs, to optimize the transmission rate. If no informa= tion is learned from the LSP receiver, the LSP transmitter is no worse off. I= f the information that was learned is old, then LSP transmitter is free to i= gnore it. If the LSP receiver can=E2=80=99t provide a useful value (e.g., if the PD la= yer hasn=E2=80=99t been implemented), it is free to provide either the stati= c value or no value. As always, I am expecting that implementation experience and inter-operabili= ty testing will contribute to this effort, and I am not expecting the right a= nswer in the first pass. Tony From nobody Fri Feb 21 01:58:13 2020 Return-Path: X-Original-To: lsr@ietf.org Delivered-To: lsr@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id 24DD11200C5; Fri, 21 Feb 2020 01:58:03 -0800 (PST) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: internet-drafts@ietf.org To: Cc: lsr@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 6.118.0 Auto-Submitted: auto-generated Precedence: bulk Reply-To: lsr@ietf.org Message-ID: <158227908303.29085.10733096360056391406@ietfa.amsl.com> Date: Fri, 21 Feb 2020 01:58:03 -0800 Archived-At: Subject: [Lsr] I-D Action: draft-ietf-lsr-flex-algo-06.txt X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 21 Feb 2020 09:58:04 -0000 A New Internet-Draft is available from the on-line Internet-Drafts directories. This draft is a work item of the Link State Routing WG of the IETF. Title : IGP Flexible Algorithm Authors : Peter Psenak Shraddha Hegde Clarence Filsfils Ketan Talaulikar Arkadiy Gulko Filename : draft-ietf-lsr-flex-algo-06.txt Pages : 34 Date : 2020-02-21 Abstract: IGP protocols traditionally compute best paths over the network based on the IGP metric assigned to the links. Many network deployments use RSVP-TE based or Segment Routing based Traffic Engineering to enforce traffic over a path that is computed using different metrics or constraints than the shortest IGP path. This document proposes a solution that allows IGPs themselves to compute constraint based paths over the network. This document also specifies a way of using Segment Routing (SR) Prefix-SIDs and SRv6 locators to steer packets along the constraint-based paths. The IETF datatracker status page for this draft is: https://datatracker.ietf.org/doc/draft-ietf-lsr-flex-algo/ There are also htmlized versions available at: https://tools.ietf.org/html/draft-ietf-lsr-flex-algo-06 https://datatracker.ietf.org/doc/html/draft-ietf-lsr-flex-algo-06 A diff from the previous version is available at: https://www.ietf.org/rfcdiff?url2=draft-ietf-lsr-flex-algo-06 Please note that it may take a couple of minutes from the time of submission until the htmlized version and diff are available at tools.ietf.org. Internet-Drafts are also available by anonymous FTP at: ftp://ftp.ietf.org/internet-drafts/ From nobody Sat Feb 22 15:05:51 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id E03EC3A0A31; Sat, 22 Feb 2020 15:05:48 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.9 X-Spam-Level: X-Spam-Status: No, score=-1.9 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id LHy9aYzwGTsP; Sat, 22 Feb 2020 15:05:47 -0800 (PST) Received: from rfc-editor.org (rfc-editor.org [4.31.198.49]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 9F4CB3A0A30; Sat, 22 Feb 2020 15:05:47 -0800 (PST) Received: by rfc-editor.org (Postfix, from userid 30) id 86D30F406CC; Sat, 22 Feb 2020 15:05:39 -0800 (PST) To: ietf-announce@ietf.org, rfc-dist@rfc-editor.org X-PHP-Originating-Script: 1005:ams_util_lib.php From: rfc-editor@rfc-editor.org Cc: rfc-editor@rfc-editor.org, drafts-update-ref@iana.org, lsr@ietf.org Content-type: text/plain; charset=UTF-8 Message-Id: <20200222230539.86D30F406CC@rfc-editor.org> Date: Sat, 22 Feb 2020 15:05:39 -0800 (PST) Archived-At: Subject: [Lsr] =?utf-8?q?RFC_8706_on_Restart_Signaling_for_IS-IS?= X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 22 Feb 2020 23:05:49 -0000 A new Request for Comments is now available in online RFC libraries. RFC 8706 Title: Restart Signaling for IS-IS Author: L. Ginsberg, P. Wells Status: Standards Track Stream: IETF Date: February 2020 Mailbox: ginsberg@cisco.com, pauwells@cisco.com Pages: 22 Obsoletes: RFC 5306 I-D Tag: draft-ietf-lsr-isis-rfc5306bis-09.txt URL: https://www.rfc-editor.org/info/rfc8706 DOI: 10.17487/RFC8706 This document describes a mechanism for a restarting router to signal to its neighbors that it is restarting, allowing them to reestablish their adjacencies without cycling through the DOWN state while still correctly initiating database synchronization. This document additionally describes a mechanism for a router to signal its neighbors that it is preparing to initiate a restart while maintaining forwarding-plane state. This allows the neighbors to maintain their adjacencies until the router has restarted but also allows the neighbors to bring the adjacencies down in the event of other topology changes. This document additionally describes a mechanism for a restarting router to determine when it has achieved Link State Protocol Data Unit (LSP) database synchronization with its neighbors and a mechanism to optimize LSP database synchronization while minimizing transient routing disruption when a router starts. This document obsoletes RFC 5306. This document is a product of the Link State Routing Working Group of the IETF. This is now a Proposed Standard. STANDARDS TRACK: This document specifies an Internet Standards Track protocol for the Internet community, and requests discussion and suggestions for improvements. Please refer to the current edition of the Official Internet Protocol Standards (https://www.rfc-editor.org/standards) for the standardization state and status of this protocol. Distribution of this memo is unlimited. This announcement is sent to the IETF-Announce and rfc-dist lists. To subscribe or unsubscribe, see https://www.ietf.org/mailman/listinfo/ietf-announce https://mailman.rfc-editor.org/mailman/listinfo/rfc-dist For searching the RFC series, see https://www.rfc-editor.org/search For downloading RFCs, see https://www.rfc-editor.org/retrieve/bulk Requests for special distribution should be addressed to either the author of the RFC in question, or to rfc-editor@rfc-editor.org. Unless specifically noted otherwise on the RFC itself, all RFCs are for unlimited distribution. The RFC Editor Team Association Management Solutions, LLC From nobody Tue Feb 25 04:41:56 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 3526F3A09BD; Tue, 25 Feb 2020 04:41:54 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.097 X-Spam-Level: X-Spam-Status: No, score=-2.097 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, UNPARSEABLE_RELAY=0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id ArI0c585NFiy; Tue, 25 Feb 2020 04:41:51 -0800 (PST) Received: from mail-ed1-x529.google.com (mail-ed1-x529.google.com [IPv6:2a00:1450:4864:20::529]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id D935C3A09BB; Tue, 25 Feb 2020 04:41:47 -0800 (PST) Received: by mail-ed1-x529.google.com with SMTP id v28so16038467edw.12; Tue, 25 Feb 2020 04:41:47 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:in-reply-to:references:mime-version:date:message-id:subject:to :cc:content-transfer-encoding; bh=EhzBELnB7OBXfvmsKtMtqjRKYevW6rf3jmaIutVjBmc=; b=uXEQj6zKYNiJp2uicVpWa9HsFh+CufvsAZTrDKiwuee4y5IZtCKst8fTIxu+pNJOi2 NOSp7Zo0knZYidaAFqtWAA2pKbIQFbLpGiewrNW1hkuGpRwT6PGic5GAJY/X1GAsWkBQ koQGlSqBLAZK2N6RmzZfh64p3RAEfUBnTEd1EXlUJAHEe+Jr0AxluCR6/JtZxJjFryZm UnlgHk2IwHZC+1X4tBN9Ic3ZG4obXwQ4EskSntPbDbtAEuOeZmFuGgiORjOPbzE530Wn mG4iCDh2jIFzlbwvKmOME+vgRJY9uqmVH7u8job+nObsULoa8MfkkVbXCo1pvHfzgwyF O9cw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:in-reply-to:references:mime-version:date :message-id:subject:to:cc:content-transfer-encoding; bh=EhzBELnB7OBXfvmsKtMtqjRKYevW6rf3jmaIutVjBmc=; b=DcEzIdG9N+lqmrzKz9RT1ca7ueSZ9fMysQ3yGzT0E+qCYoTPFJ/7/OUH5YbF+YBl1A H8ulfdxDuOB2uoA9r/Ty003Yi2Imx8XN93acF57xKoc/IR+15F4zjAawnqQpJv9CIwBq 5CFcrk56IpGzBNzzSHg4RCXDR6O76k3HrT8/7u2CbOx33oD5Sm552A4v6A74ZUuixiYz 30v3XyhJcnEytb3iSPgAc76ehp/Qkf7ydDDCEFdbxPu4YZoG8B96ed1zXrgwHQDhcOlI QsXMeFwksbtQmvSdEU6jyo22hdSTyBRTSmY2JOZSZW2k0nikY9RfJnq7J4CqCGDiaOzx sfbw== X-Gm-Message-State: APjAAAUoHx0yX3XbeDGhFe/xna/v+0nQEaiSsagPeHIGEoEo00RFV4Pu YuXOuA2SPnxpRZgQPwXAirUct2BAKKPK7uu9LjE= X-Google-Smtp-Source: APXvYqwgt5df5SWW+lHxprfvmn3rfzvI2mSwMu3/wDa1KsoaIGTi2lRkjhnTuCNLNpRRt7DdCvy3lj3reKZqV1d99Pk= X-Received: by 2002:aa7:c915:: with SMTP id b21mr53518543edt.174.1582634505869; Tue, 25 Feb 2020 04:41:45 -0800 (PST) Received: from 1058052472880 named unknown by gmailapi.google.com with HTTPREST; Tue, 25 Feb 2020 04:41:44 -0800 From: Alvaro Retana In-Reply-To: References: MIME-Version: 1.0 Date: Tue, 25 Feb 2020 04:41:44 -0800 Message-ID: To: "Les Ginsberg (ginsberg)" , "draft-ietf-isis-te-app@ietf.org" Cc: "Acee Lindem (acee)" , "lsr@ietf.org" , "lsr-chairs@ietf.org" Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Archived-At: Subject: Re: [Lsr] AD Review of draft-ietf-isis-te-app-09 X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 25 Feb 2020 12:41:55 -0000 On February 7, 2020 at 1:50:58 AM, Les Ginsberg wrote: Les: Hi! > We have published V10 of the draft addressing your comments. It looks like your copy of my review was truncated (not sure why). The archive has the complete version, and I pasted the remaining comments at the end of this message. https://mailarchive.ietf.org/arch/msg/lsr/Q39ilCqsDo0WIhayZ57RTqHEHCQ/ > Note that the authors of the IS-IS and OSPF drafts are "synchronizing" as > there is a lot of similarity in your comments regarding the two drafts. W= e > have decided to close all issues with you for the IS-IS draft first - the= n > hopefully the equivalent changes can be made for the OSPF draft can be ma= de > and resolved more quickly. Makes sense! > Detailed responses inline. I have some responses myself; most of them not-major. =C2=A0I've indicated the ones that I consider major -- it would be ideal if others in the WG chimed in with any opinions. Thanks! Alvaro. ... > > (B) I was able to identify one significant functional difference which > > warrants a discussion of the reason for it and maybe the pros/cons: > > > > =C2=A74.1 talks about the behavior when "both SABM Length and UDABM Len= gth > > are zero". This document makes the use of the attributes optional while= the > > OSPF draft mandates their use (=C2=A73). > > > [Les:] Both drafts use the word "MAY" in the respective sections entitled > "Use of Zero Length Application Identifier Bit Masks". > > "MAY" - or perhaps "may" - makes sense to me because in the absence of SA= BM > bits there is no way to know if a given application will have any reason = to > use the attributes advertised. The text is intended to say use by any > application is "permitted". I have changed the text in this way. I'm fine with the changes you made. This is the text from the OSPF draft that I was referring to: =C2=A0 =C2=A0When neither the Standard Application Bits nor the User Define= d =C2=A0 =C2=A0Application bits are set (i.e., both SABM Length and UDABM Len= gth are =C2=A0 =C2=A00) in the ASLA sub-TLV, then the link attributes included in i= t MUST =C2=A0 =C2=A0be considered as being applicable to all applications. >From your explanation, I see the intent, but the use of "MUST" gives the impression that there's no choice. ... > > 177 3. Legacy Advertisements ... > > [minor] Please add references to where all the values in this section > > are defined...if the same as the references above. > > > [Les:] Done. Sorry, I meant the RFCs where the sub-TLVs are defined, not the registries. ... > > 231 4.1. Application Identifier Bit Mask > > > > 233 Identification of the set of applications associated with link > > 234 attribute advertisements utilizes two bit masks. One bit mask is fo= r > > 235 standard applications where the definition of each bit is defined i= n > > 236 a new IANA controlled registry. A second bit mask is for non- > > 237 standard User Defined Applications(UDAs). ... > > [minor] "second bit mask is for non-standard User Defined > > Applications" The explicit point is made here that the UDAs are used > > for *non-standard* applications. Given that these bits are for *user > > defined* applications, the user can make the bits mean anything they > > want (including SRTE, LFA, etc.), right? If so, then highlighting > > *non-standard* seems not to be needed. s/for non-standard User > > Defined Applications/for User Defined Applications > > > [Les:] In theory it is possible for a User Defined Application to perform= the > same functions as a standard application (such as SRTE). However, if it d= id > so it would not be "Standard SRTE" and the bit could NOT be considered as= the > same as "standard SRTE". I didn't mean just the same function, but the same application. =C2=A0Let me try again. Can an operator do the following: =C2=A0define a bit (call it X) in the UDABM to mean SRTE (*the* SRTE)? =C2=A0IOW, for the routers operating in the network (which all would be aware of the X-bit), when the X-bit is set it indicates that SRTE will use the information. =C2=A0This operation would result in exactly the same thing as if the S-bit was set. Why would anyone want to do this? =C2=A0For security reasons (for example): by not using the defined bit, anyone eavesdropping on the LSPs would not know which application is enabled. In any case, this is just a nit/minor comment... ... > > [major] In a mixed network, where some routers support this > > specification, but other don't, it seems that setting the L-flag would > > be useful as all applications would "fall back" to the legacy > > advertisements. However, not setting the L-flag seems to have the > > potential for the routers to use different information resulting in > > (at best) inconsistent decisions if the values are not the same. > > > [Les:] The revised Deployment considerations section now addresses this. [nit] In the new =C2=A76.3.3 (Interoperability with Legacy Routers) it might be good to mention the setting of the L-flag. =C2=A0For example, extend Step 1, "Receiving routers continue to use legacy advertisements" to include a mention of the L-flag being set. ... > > [major] "Undefined bits MUST be transmitted as 0 and MUST be ignored > > on receipt." What if the sender and the receiver support a different > > set of applications? For example, suppose that the sender supports a > > new application identified by the N-bit, and sets only that bit; the > > receiver treats the N-bit as undefined and ignores it. The result is > > that, for the receiver, there seems to be no indication of an > > application. Is "no application" a valid indication, or should at > > least one bit always be set? > > > [Les:] Just like unknown TLVs, unknown bits MUST be ignored. > I have added text. Yes, that is ok. [major] But you didn't answer my question: Is "no application" a valid indication, or should at least one bit always be set? =C2=A0I guess that the receiver wouldn't see anything it understands... =C2=A0Would this be equivalent to zero-length masks? > > [minor] Following on the previous comment... It seems that a > > requirement is for the routers/nodes in the domain to agree on the > > meaning of the bits: support the same Standard Applications and > > interpret the User Defined bit mask the same way. Please add this > > type of information to the Deployment Considerations Section. > > > [Les:] Standard Applications by definition have bits which are assigned > by IANA. There is therefore no need to say routers have to agree > on their meaning. > User Defined Applications are - by definition - outside the scope of this > specification. They can do whatever they want. Let me try again... What issues can arise from the routers supporting a different set of applications/bits? =C2=A0I can imagine several ways for this to occur, for example: routers that have not been upgraded to support the latest assignments...bad configuration practices there the UDAs are not consistently instantiated in the whole network... IOW, if a new application is implemented in the network, but not all the routers are aware of the corresponding bit (because they're running old software or were not configured correctly, for example), then it is possible that the network will not operate as expected. ... > > 337 4.2. Application Specific Link Attributes sub-TLV ... > > 361 Multiple Application Specific Link Attribute sub-TLVs for the same > > 362 link MAY be advertised. When multiple sub-TLVs for the same link ar= e > > 363 advertised, they SHOULD advertise non-conflicting application/ > > 364 attribute pairs. A conflict exists when the same application is > > 365 associated with two different values of the same link attribute for= a > > 366 given link. In cases where conflicting values for the same > > 367 application/attribute/link are advertised all the conflicting value= s > > 368 MUST be ignored. > > > > 370 For a given application, the setting of the L-flag MUST be the same > > 371 in all sub-TLVs for a given link. In cases where this constraint is > > 372 violated, the L-flag MUST be considered set for this application. > > > > [major] Tying these two paragraphs together... If one of the sub-TLVs > > has the L-flag set, then all the sub-TLVs that include at least one > > common application MUST be considered as having the L-flag set as > > well. This seems to become an attack vector: a rogue IS can set the > > L-flag (and/or set application bits) in all/some of the > > sub-TLVs...which may result in no attribute information (if the > > sub-sub-TLVs were the only source of information and are ignored) for > > a link... > > > [Les:] The text says: > > "Link attribute sub-sub-TLVs for the corresponding link attributes MUST N= OT > be advertised for the set of applications specified in the Standard/User > Application Identifier Bit Masks and all such advertisements MUST be igno= red > on receipt." > > There is no reason to send multiple sub-TLVs w L-bit set on a given link > because by definition such a sub-TLV MUST NOT have any sub-sub-TLVs. > > Authentication (as always) is our protection against attacks. [major] No, not against an IS that has been taken over: an attacker has access to it, its configuration, etc., it is rogue. Authentication only proves that the IS is the IS it says it is, not that it is not sending malicious information. To be clear, I'm not asking for the rogue node problem to be solved in this document. =C2=A0Just that the risks are recognized. I'm mentioning this point about rogue nodes because that is the new focus of the SEC area. =C2=A0I really don't want to go forward with Security Considerations consisting of a single line...but if you prefer to discuss with the SecDir/SEC AD, I'm fine with it. :-) ... > > [major] "...and IANA is requested to assign the legacy sub-TLV > > identifer to the corresponding sub-sub-TLV." (s/identifer/identifier) > > Is this assignment something that should also be done going forward > > (for new "legacy sub-TLVs"), or just for the initial values in the > > registry? The new registry has a registration policy of "Expert > > Review", please include any instructions for the DEs-to-be in the IANA > > Considerations section...and maybe a (Normative) pointer to rfcxxx for > > completeness. > > > [Les:] I have added text in the IANA section. [minor] Please remove the remaining IANA-instructions-related text from this section. ... > > 463 5.1. Use of Legacy Advertisements ... > > [] I think that the text in this section can be generalized to any > > application, not just ones defined in this document. s/The Standard > > Applications defined in this document MAY continue/The Standard > > Applications may continue > > > [Les:] The existing applications have the special property that they are > already deployed using legacy advertisements. This cannot be said for > any as yet to be defined applications. You can insist in the documents > that define new applications that they discuss whether legacy advertiseme= nts > can/cannot be used, but this document cannot speak to new applications > without being clairvoyant. I still think that the text can be generalized...but I won't insist on it since no one else in the WG is. [major] I do however want to contrast the last sentence above: =C2=A0 =C2=A0You can insist in the documents that define new applications t= hat they =C2=A0 =C2=A0discuss whether legacy advertisements can/cannot be used... ...with the first sentence of the last paragraph: =C2=A0 =C2=A0New applications which future documents define to make use of = the =C2=A0 =C2=A0advertisements defined in this document MUST NOT make use of l= egacy =C2=A0 =C2=A0advertisements. If "future documents...MUST NOT make use of legacy advertisements", then no one can't ask them to justify their use. =C2=A0It's like trying to be clairvoyant... I would be ok if s/MUST NOT/SHOULD NOT, which (given the rest of the paragraph) puts the burden on new documents to justify using legacy advertisements. ... > > 612 Migrating RSVP-TE away from legacy advertisements could result in > > 613 some implementation simplification as it allows the removal of code > > 614 which encodes/decodes the legacy advertisements. Whether this is > > 615 seen as desirable is something for the marketplace to determine Your reply ends here...but my comments kept going. ;-) =C2=A0I'm not sure of the reason, but I've seen long messages be truncated. =C2=A0The archive has the full review: https://mailarchive.ietf.org/arch/msg/lsr/Q39ilCqsDo0WIhayZ57RTqHEHCQ/ You added rfc8402 as a reference for SRTE, but the text also says (=C2=A72): "...SRTE which is defined in [I-D.ietf-spring-segment-routing-policy]." =C2=A0Pick one. I am pasting below the remaining comments (based on the -09 text): 612 =C2=A0 Migrating RSVP-TE away from legacy advertisements could result = in 613 =C2=A0 some implementation simplification as it allows the removal of = code 614 =C2=A0 which encodes/decodes the legacy advertisements. =C2=A0Whether = this is 615 =C2=A0 seen as desirable is something for the marketplace to determine= . [?] "allows the removal of code which encodes/decodes the legacy advertisements" =C2=A0If the sub-sub-TLVs used are the same as the legacy ones, wouldn't the code be pretty much the same?? =C2=A0Either way, considerations which may be implementation-dependent seems out of place is a section talking about deployment. 617 8. =C2=A0IANA Considerations [minor] For clarity, consider using sub-sections below. 619 =C2=A0 This document defines a new sub-TLV for TLVs 22, 23, 25, 141, 2= 22, 620 =C2=A0 and 223. [major] Please explicitly include the name of the registry. 622 =C2=A0 =C2=A0Type =C2=A0Description =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0= =C2=A0 22 =C2=A0 23 =C2=A0 25 =C2=A0141 =C2=A0222 =C2=A0223 623 =C2=A0 =C2=A0---- =C2=A0--------------------- =C2=A0---- ---- ---- ---= - ---- ---- 624 =C2=A0 =C2=A0 16 =C2=A0 Application Specific =C2=A0 =C2=A0 y =C2=A0 = =C2=A0y =C2=A0y(s) =C2=A0 y =C2=A0 =C2=A0y =C2=A0 =C2=A0y 625 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Link Attributes 627 =C2=A0 This document defines one new TLV: [major] Explicitly mention the name of the registry. 629 =C2=A0 =C2=A0Type =C2=A0Description =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0= =C2=A0 IIH LSP SNP Purge 630 =C2=A0 =C2=A0---- =C2=A0--------------------- =C2=A0 --- --- --- ----- 631 =C2=A0 =C2=A0 238 =C2=A0Application Specific =C2=A0 =C2=A0 n =C2=A0 y = =C2=A0 n =C2=A0 =C2=A0n 632 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 SRLG 634 =C2=A0 This document requests a new IANA registry be created to contro= l the 635 =C2=A0 assignment of sub-sub-TLV codepoints for the Application Specif= ic 636 =C2=A0 Link Attributes sub-TLV. =C2=A0The suggested name of the new re= gistry is 637 =C2=A0 "sub-sub-TLV code points for application specific link attribut= es". 638 =C2=A0 The registration procedure is "Expert Review" as defined in 639 =C2=A0 [RFC8126]. =C2=A0The following assignments are made by this doc= ument: [major] Explicitly indicate where the new sub-registries should be created. =C2=A0In this case in the "IS-IS TLV Codepoints" registry. [minor] Adding a reference to rfc7370 would be useful. =C2=A0Make it Normat= ive. [major] If the legacy specifications are extended, is it expected that new sub-sub-TLVs will also be created? =C2=A0If so, there need to be explicit instructions to the DEs in the legacy registries. ... 663 =C2=A0 This document requests a new IANA registry be created, under th= e 664 =C2=A0 category of "Interior Gateway Protocol (IGP) Parameters", to co= ntrol 665 =C2=A0 the assignment of Application Identifier Bits. =C2=A0The sugges= ted name of 666 =C2=A0 the new registry is "Link Attribute Applications". =C2=A0The re= gistration 667 =C2=A0 policy for this registry is "Standards Action" ([RFC8126] and 668 =C2=A0 [RFC7120]). =C2=A0The following assignments are made by this do= cument: [minor] If we're setting up a applications, why not make it generic: "IGP Applications", for example...?? [minor] s/"Standards Action" ([RFC8126] and [RFC7120])./"Standards Action" [RFC8126]. =C2=A0 =C2=A0 Standards Action is only defined in rfc812= 6; the reference to rfc7120 is not needed. 670 =C2=A0 =C2=A0Bit # =C2=A0 Name 671 =C2=A0 --------------------------------------------------------- 672 =C2=A0 =C2=A0 0 =C2=A0 =C2=A0 =C2=A0RSVP-TE (R-bit) 673 =C2=A0 =C2=A0 1 =C2=A0 =C2=A0 =C2=A0Segment Routing Traffic Engineerin= g (S-bit) 674 =C2=A0 =C2=A0 2 =C2=A0 =C2=A0 =C2=A0Loop Free Alternate (F-bit) [major] =C2=A0Add a line to cover the rest of the range and call it "Unassi= gned". 676 =C2=A0 This document requests a new IANA registry be created to contro= l the 677 =C2=A0 assignment of sub-TLV types for the application specific SRLG T= LV. 678 =C2=A0 The suggested name of the new registry is "Sub-TLVs for TLV 238= ". 679 =C2=A0 The registration procedure is "Expert Review" as defined in 680 =C2=A0 [RFC8126]. =C2=A0The following assignments are made by this doc= ument: [major] Indicate where this registry should be created. [minor] Adding a reference to rfc7370 would be useful. Make it Normative. 682 =C2=A0 =C2=A0Value =C2=A0 =C2=A0Description 683 =C2=A0 =C2=A0--------------------------------------------------------- 684 =C2=A0 =C2=A0 0-3 =C2=A0 =C2=A0 Unassigned 685 =C2=A0 =C2=A0 =C2=A04 =C2=A0 =C2=A0 =C2=A0Link Local/Remote Identifier= s (see [RFC5307]) 686 =C2=A0 =C2=A0 =C2=A05 =C2=A0 =C2=A0 =C2=A0Unassigned 687 =C2=A0 =C2=A0 =C2=A06 =C2=A0 =C2=A0 =C2=A0IPv4 interface address (see = [RFC5305]) 688 =C2=A0 =C2=A0 =C2=A07 =C2=A0 =C2=A0 =C2=A0Unassigned 689 =C2=A0 =C2=A0 =C2=A08 =C2=A0 =C2=A0 =C2=A0IPv4 neighbor address (see [= RFC5305]) 690 =C2=A0 =C2=A0 9-11 =C2=A0 =C2=A0Unassigned 691 =C2=A0 =C2=A0 12 =C2=A0 =C2=A0 =C2=A0IPv6 Interface Address (see [RFC6= 119]) 692 =C2=A0 =C2=A0 13 =C2=A0 =C2=A0 =C2=A0IPv6 Neighbor Address (see [RFC61= 19]) 693 =C2=A0 =C2=A014-255 =C2=A0 Unassigned [major] Do you want the reference to the assignments to be this document, the RFC where the encoding is defined, or both? =C2=A0I would suggest both. =C2=A0Please add a column to reflect that: e.g., "[RFC5307] [This Document]"...and take out the "(see ...)" text. 695 9. =C2=A0Security Considerations 697 =C2=A0 Security concerns for IS-IS are addressed in [ISO10589, [RFC530= 4], 698 =C2=A0 and [RFC5310]. [major] ISO10589 is not in the References section. =C2=A0It should be a Normative reference. [major] rfc5304/rfc5310 only talk about authentication. =C2=A0What about vulnerabilities specifically introduced by the new functionality? This document doesn't define new TE-related attributes, just a new way to advertise them...perhaps include something like this: =C2=A0 =C2=A0This document defines a new way to advertise already defined T= E Attributes. =C2=A0 =C2=A0As these TLVs are not used for SPF computation or normal routi= ng, the =C2=A0 =C2=A0extensions specified here have no direct effect on IP routing.= =C2=A0Tampering =C2=A0 =C2=A0with the information defined in this document may have an effe= ct on =C2=A0 =C2=A0applications using it, including potential sub-optimal Traffic= Engineering. =C2=A0 =C2=A0This is not new...see [RFC5305], [RFC5307], [RFC6119], and [RF= C8570]. And then there are possible vulnerabilities introduced by this document. =C2=A0I put some comments above about the ability of a rogue router to render the data unusable by setting, for example the L-flag, or sending conflicting values. =C2=A0At best, this action could result in sub-optimal paths (by taking some links out of consideration)... Consider adding text related to that. From sergey.v.shpenkov@gmail.com Sun Feb 23 15:39:32 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id ABE993A0E3D for ; Sun, 23 Feb 2020 15:39:32 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -0.446 X-Spam-Level: X-Spam-Status: No, score=-0.446 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_IMAGE_ONLY_08=1.651, HTML_IMAGE_RATIO_02=0.001, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001] autolearn=no autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id bAeOZUc_OxMH for ; Sun, 23 Feb 2020 15:39:31 -0800 (PST) Received: from mail-il1-x135.google.com (mail-il1-x135.google.com [IPv6:2607:f8b0:4864:20::135]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 76A253A11F9 for ; Sun, 23 Feb 2020 15:39:31 -0800 (PST) Received: by mail-il1-x135.google.com with SMTP id v13so6249649iln.4 for ; Sun, 23 Feb 2020 15:39:31 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:from:date:message-id:subject:to; bh=5nFwhYJmomSDMq8UiN4bNTf1ZIybqYeOXHe50APKD8Y=; b=jlL69zwmZ6jl6liSwfNkms+VrO9lBzmLnAfZI3HzsstJsDHaMe7iPvilgOvGD8I/s/ 7K079lVNHhK3omFC1uHbMT5RC6BSNo+vGzlrVAxBc8dYUVoHjtDI+ocJAm0q4/NzeCOU Zqg3pbOEav+eTy8yEOentrwJZ56a6WV7RLaBJkDPbbBIQ0B7RU32Bjib+shAvebbUgk6 vceo+SDhvYxjVdHkbb7nqbKDiPHFp5769QXDRElDgh8w6xqS6i10KKJpYbM28Xz1RKgg rswORhQf0xUQuHFeXTbt+kLSdFwLY1dQfjhQSfknei4THu2uP+5/ZRQAqBLvqH4GezoG 9kAA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:from:date:message-id:subject:to; bh=5nFwhYJmomSDMq8UiN4bNTf1ZIybqYeOXHe50APKD8Y=; b=QWAI+AL7XI0ibKaA6P0tt4z1rftRbb66pNALggOvQOaD49QamAeM93mGzaTfYOdzE6 oEkBVjbFBa1a9LUoWDxgfeVh3epAvHs7ptbLETbQta8Jr8dlh1KFP7AKuGIGNy2cGLkA b8PyLycwgfVeCvuQ87SCQRqbk2970FesbxJGe4G5yV3qGBlvB4Sn32rzlviOvIA7DyHG 9eOmp+UUuCBxYKcVhNRmaQ3KuuZIlix49h8grVDWLtxEYXvKFmCPfFkdBOspNeTf3h0q DgTSVHOW1woXriOwIioingaInLLLLh64+jTDcQXDvGOZIPfZHIj3IBN1upAf3wv302TH 85pA== X-Gm-Message-State: APjAAAWF6wy0cA5/cTVXUiR+phzdqfkinJQ7nvJLiYscNgDaSI/JcoQB dzo4p3Law9iN+mJvEvEPKK02vQz8BVr3v3Q0jnNIX11M X-Google-Smtp-Source: APXvYqzL1GECGvPdeICcEg4nxEyYw3IFeZzNtRGimZX3/zOLVMI4WiNSl+kSufY7PT0m78xnOObKg62c0LYTs9Su9u4= X-Received: by 2002:a92:b74c:: with SMTP id c12mr50078490ilm.154.1582501170119; Sun, 23 Feb 2020 15:39:30 -0800 (PST) MIME-Version: 1.0 From: Sergey SHpenkov Date: Mon, 24 Feb 2020 02:37:19 +0300 Message-ID: To: lsr@ietf.org Content-Type: multipart/related; boundary="0000000000001ac16a059f46c45b" Archived-At: Subject: [Lsr] Question about OSPF (transit area routing loop) X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 25 Feb 2020 19:38:18 -0000 --0000000000001ac16a059f46c45b Content-Type: multipart/alternative; boundary="0000000000001ac168059f46c45a" --0000000000001ac168059f46c45a Content-Type: text/plain; charset="UTF-8" Hi, In section 16.3 of the OSPF RFC 2328 standard, it is stated that all ABR routers connected to a transit area are required to check the sumLSA contained within this area in order to possibly improve the intra-area and inter-area backbone routes for themselves. See the picture: [image: VL_Loop.PNG] The RT_1 and ABR_3 routers will use different paths to the ASBR router: ABR_3 -> RT_1 -> ABR_1 -> ASBR = cost 3 RT_1 -> ABR_3 -> ABR_2 -> ASBR = cost 21 route loop between RT_1 and ABR_3 Please explain this situation Thanks, Sergey --0000000000001ac168059f46c45a Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hi,

In section 16.3 of the OSPF RFC 2328 stand= ard, it is stated that all ABR routers
connected to a transi= t area are required to check the sumLSA contained within
this are= a in order to possibly improve the intra-area and inter-area backbone route= s
for themselves.

See the picture:
3D"VL_Loop.PNG"
The RT_1 and ABR_3 routers will use different paths to t= he ASBR router:

ABR_3 -> RT_1 -> ABR_1 -> ASBR =3D cost 3RT_1 -> ABR_3 -> ABR_2 -> ASBR =3D cost 21

route loop bet= ween RT_1 and ABR_3

Please explain this situation

Thanks,
= Sergey


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multipart/alternative; boundary="000000000000398370059f757566" --000000000000398370059f757566 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Acee, Because ABR_1 creates SumLSA-4 for the ASBR not from the backbone area. The cost of SumLSA-4 for ASBR is 300. Thanks, Sergey =D0=B2=D1=82, 25 =D1=84=D0=B5=D0=B2=D1=80. 2020 =D0=B3. =D0=B2 22:44, Acee = Lindem (acee) : > Hi Sergey, > > I don=E2=80=99t see why RT_1 wouldn=E2=80=99t go through ABR_1 to get to = the ASBR. > > Thanks, > > Acee > > > > *From: *Lsr on behalf of Sergey SHpenkov < > sergey.v.shpenkov@gmail.com> > *Date: *Tuesday, February 25, 2020 at 2:38 PM > *To: *"lsr@ietf.org" > *Subject: *[Lsr] Question about OSPF (transit area routing loop) > > > > Hi, > > In section 16.3 of the OSPF RFC 2328 standard, it is stated that all ABR > routers > > connected to a transit area are required to check the sumLSA contained > within > > this area in order to possibly improve the intra-area and inter-area > backbone routes > > for themselves. > > > See the picture: > > The RT_1 and ABR_3 routers will use different paths to the ASBR router: > > ABR_3 -> RT_1 -> ABR_1 -> ASBR =3D cost 3 > RT_1 -> ABR_3 -> ABR_2 -> ASBR =3D cost 21 > > route loop between RT_1 and ABR_3 > > Please explain this situation > > Thanks, > Sergey > > > --000000000000398370059f757566 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Acee,

Because ABR_1 creates SumLSA-4= for the ASBR not from the backbone area.=C2=A0The cost of SumLSA-4 for ASBR is 300.

Thanks,
Sergey

= =D0=B2=D1=82, 25 =D1=84=D0=B5=D0=B2=D1=80. 2020 =D0=B3. =D0=B2 22:44, Acee = Lindem (acee) <acee@cisco.com>:=

Hi Sergey,

I don=E2=80=99t see why RT_1 wouldn=E2=80=99t go thr= ough ABR_1 to get to the ASBR.

Thanks,

Acee

=C2=A0

From: Lsr <lsr-bounces@ietf.org> o= n behalf of Sergey SHpenkov <sergey.v.shpenkov@gmail.com>
Date: Tuesday, February 25, 2020 at 2:38 PM
To: "lsr@ietf= .org" <lsr@ie= tf.org>
Subject: [Lsr] Question about OSPF (transit area routing loop)

=C2=A0

Hi,

In section 16.3 of the O= SPF RFC 2328 standard, it is stated that all ABR routers

connected to a transit a= rea are required to check the sumLSA contained within

this area in order to po= ssibly improve the intra-area and inter-area backbone routes<= /p>

for themselves.


See the picture:

The RT_1 and ABR_3 routers will use different paths to the ASBR router:

ABR_3 -> RT_1 -> ABR_1 -> ASBR =3D cost 3
RT_1 -> ABR_3 -> ABR_2 -> ASBR =3D cost 21

route loop between RT_1 and ABR_3

Please explain this situation

Thanks,
Sergey

=C2=A0

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From: To: "Les Ginsberg (ginsberg)" CC: "lsr@ietf.org" Thread-Topic: [Lsr] Flow Control Discussion for IS-IS Flooding Speed Thread-Index: AdXmy57f2RSCRtnIRvCBUZONA/nqBQAL/WgAABI4N4ABY3iW8A== Date: Wed, 26 Feb 2020 18:33:43 +0000 Message-ID: <4244_1582742024_5E56BA08_4244_162_1_53C29892C857584299CBF5D05346208A48DB42F1@OPEXCAUBM43.corporate.adroot.infra.ftgroup> References: In-Reply-To: Accept-Language: fr-FR, en-US Content-Language: fr-FR X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.114.13.247] Content-Type: multipart/alternative; boundary="_000_53C29892C857584299CBF5D05346208A48DB42F1OPEXCAUBM43corp_" MIME-Version: 1.0 Archived-At: Subject: Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 26 Feb 2020 18:33:50 -0000 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Received: from OPEXCAUBM43.corporate.adroot.infra.ftgroup ([fe80::b846:2467:1591:5d9d]) by OPEXCAUBM5C.corporate.adroot.infra.ftgroup ([::1]) with mapi id 14.03.0468.000; Wed, 26 Feb 2020 20:03:21 +0100 From: To: "Les Ginsberg (ginsberg)" CC: "lsr@ietf.org" Thread-Topic: Flow Control Discussion for IS-IS Flooding Speed Thread-Index: AdXmy57f2RSCRtnIRvCBUZONA/nqBf//8YOA//PhizA= Date: Wed, 26 Feb 2020 19:03:21 +0000 Message-ID: <15812_1582743802_5E56C0FA_15812_292_1_53C29892C857584299CBF5D05346208A48DB43B6@OPEXCAUBM43.corporate.adroot.infra.ftgroup> References: In-Reply-To: Accept-Language: fr-FR, en-US Content-Language: fr-FR X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.114.13.247] Content-Type: multipart/alternative; boundary="_000_53C29892C857584299CBF5D05346208A48DB43B6OPEXCAUBM43corp_" MIME-Version: 1.0 Archived-At: Subject: Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 26 Feb 2020 19:03:28 -0000 --_000_53C29892C857584299CBF5D05346208A48DB43B6OPEXCAUBM43corp_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Les, Please see inline[Bruno] From: Lsr [mailto:lsr-bounces@ietf.org] On Behalf Of Les Ginsberg (ginsberg) Sent: Wednesday, February 19, 2020 3:32 AM To: lsr@ietf.org Subject: Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed Base protocol operation of the Update process tracks the flooding of LSPs/interface and guarantees timer-based retransmission on P2P interfaces until an acknowledgment is received. Using this base protocol mechanism in combination with exponential backoff = of the retransmission timer provides flow control in the event of temporary overlo= ad of the receiver. This mechanism works without protocol extensions, is dynamic, operates independent of the reason for delayed acknowledgment (dropped packets, CPU overload), and does not require additional signaling during the overloaded period. This is consistent with the recommendations in RFC 4222 (OSPF). Receiver-based flow control (as proposed in https://datatracker.ietf.org/do= c/draft-decraene-lsr-isis-flooding-speed/ ) requires protocol extensions and introduces additional signaling during periods of high load. The asserted reason for this is to optimize throughpu= t - but there is no evidence that it will achieve this goal. Mention has been made to TCP-like flow control mechanisms as a model - which are indeed receiver based. However, there are significant differences betwe= en TCP sessions and IGP flooding. TCP consists of a single session between two endpoints. Resources (primarily buffer space) for this session are typically allocated in the control plane and current usage is easily measurable.. IGP flooding is point-to-multi-point, resources to support IGP flooding involve both control plane queues and dataplane queues, both of which are typically not per interface - nor even dedicated to a particular protocol instance. What input is required to optimize receiver-based flow control is= not fully specified. https://datatracker.ietf.org/doc/draft-decraene-lsr-isis-flooding-speed/ su= ggests (Section 5) that the values to be advertised: "use a formula based on an off line tests of the overall LSPDU processing speed for a particular set of hardware and the number of interfaces configured for IS-IS" implying that the advertised value is intentionally not dynamic. As such, it could just as easily be configured on the transmit side and not require additional signaling. As a static value, it would necessarily be somewhat conservative as it has to account for the worst case under the current configuration - which means it needs to consider concurrent use of the CPU and dataplane by all protocols/features which are enabled on a router - not= all of whose use is likely to be synchronized with peak IS-IS flooding load. [Bruno] _Assuming_ that the parameters are static, those parameters o are the same as the one implemented (configured) on multiple implementa= tions, including the one from your employer. Now do you believe that those = parameters can be determined? =A7 If yes, how do you do _today_ on your implementation? (this seems to c= ontradict your statement that you have no way to figure out how to find the= right value) =A7 If no, why did you implement those parameters, and ask network operato= r to configure them? =A7 There is also the option to reply: I don't know but don't care as I le= ave the issue to the network operator. o can still provide some form of dynamicity, by using the PSNP as dynamic= acknowledgement. o are really dependent on the receiver, not the sender. =A7 the sender will never overload itself. =A7 The receiver has more information, knowing its processing power (low = end, high end, 80s, 20s (currently we are stuck with 20 years old value ass= uming the worst possible receiver (and worst there were, including with pac= ket processing partly done in the control plane processor)), its expected I= S-IS load (#neighbors), its preference for bursty LSP reception (high delay= between IS-IS CPU allocation cycles, memory not an issue up to x kilo-octe= t...), its expected control plane load if IS-IS traffic has not higher prio= rity over other control plane traffic...), it's expected level of QoS prior= itization [1] =B7 [1] looks for "Extended SPD Headroom". E.g. "Since IGP and lin= k stability are more tenuous and more crucial than BGP stability, such pack= ets are now given the highest priority and are given extended SPD headroom = with a default of 10 packets. This means that these packets are not dropped= if the size of the input hold queue is lower than 185 (input queue default= size + spd headroom size + spd extended headroom)." o And this is for distributed architecture, 15 years ago. So what about u= sing the above number (in the router configuration), applies Tony's proposa= l (*oversubscription/number of IS neighbhors), and advertise this value to = your LSP sender? [1] https://www.cisco.com/c/en/us/support/docs/routers/12000-series-routers= /29920-spd.html - --Bruno Unless a good case can be made as to why transmit-based flow control is not= a good fit and why receiver-based flow control is demonstrably better, it seems unnecessary to extend the protocol. Les From: Lsr On Behalf Of Les Ginsberg (ginsberg) Sent: Tuesday, February 18, 2020 6:25 PM To: lsr@ietf.org Subject: [Lsr] Flow Control Discussion for IS-IS Flooding Speed Two recent drafts advocate for the use of faster LSP flooding speeds in IS-= IS: https://datatracker.ietf.org/doc/draft-decraene-lsr-isis-flooding-speed/ https://datatracker.ietf.org/doc/draft-ginsberg-lsr-isis-flooding-scale/ There is strong agreement on two key points: 1)Modern networks require much faster flooding speeds than are commonly in = use today 2)To deploy faster flooding speeds safely some form of flow control is need= ed The key point of contention between the two drafts is how flow control shou= ld be implemented. https://datatracker.ietf.org/doc/draft-decraene-lsr-isis-flooding-speed/ ad= vocates for a receiver based flow control where the receiver advertises in = hellos the parameters which indicate the rate/burst size which the receiver= is capable of supporting on the interface. Senders are required to limit t= he rate of LSP transmission on that interface in accordance with the values= advertised by the receiver. https://datatracker.ietf.org/doc/draft-ginsberg-lsr-isis-flooding-scale/ a= dvocates for a transmit based flow control where the transmitter monitors t= he number of unacknowledged LSPs sent on each interface and implements a ba= ckoff algorithm to slow the rate of sending LSPs based on the length of the= per interface unacknowledged queue. While other differences between the two drafts exist, it is fair to say tha= t if agreement could be reached on the form of flow control then it is lik= ely other issues could be resolved easily. This email starts the discussion regarding the flow control issue. ___________________________________________________________________________= ______________________________________________ Ce message et ses pieces jointes peuvent contenir des informations confiden= tielles ou privilegiees et ne doivent donc pas etre diffuses, exploites ou copies sans autorisation. Si vous avez recu= ce message par erreur, veuillez le signaler a l'expediteur et le detruire ainsi que les pieces jointes. Les messages el= ectroniques etant susceptibles d'alteration, Orange decline toute responsabilite si ce message a ete altere, deforme ou = falsifie. Merci. This message and its attachments may contain confidential or privileged inf= ormation that may be protected by law; they should not be distributed, used or copied without authorisation. If you have received this email in error, please notify the sender and dele= te this message and its attachments. As emails may be altered, Orange is not liable for messages that have been = modified, changed or falsified. Thank you. --_000_53C29892C857584299CBF5D05346208A48DB43B6OPEXCAUBM43corp_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Les,

 

Please see inline[Brun= o]

 

From: Lsr [mailto:lsr-bounces@ietf.org] On Behalf Of Les Ginsberg (ginsbe= rg)
Sent: Wednesday, February 19, 2020 3:32 AM
To: lsr@ietf.org
Subject: Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed<= o:p>

 

Base protocol operation of the Update proce= ss tracks the flooding of

LSPs/interface and guarantees timer-based r= etransmission on P2P interfaces

until an acknowledgment is received.

 

Using this base protocol mechanism in combi= nation with exponential backoff of the

retransmission timer provides flow control = in the event of temporary overload

of the receiver.

 

This mechanism works without protocol exten= sions, is dynamic, operates

independent of the reason for delayed ackno= wledgment (dropped packets, CPU

overload), and does not require additional = signaling during the overloaded

period.

 

This is consistent with the recommendations= in RFC 4222 (OSPF).

 

Receiver-based flow control (as proposed in https://datatracker.ietf.org/doc/draft-decraene-lsr-isis-flooding-speed/ )

requires protocol extensions and introduces= additional signaling during

periods of high load. The asserted reason f= or this is to optimize throughput -

but there is no evidence that it will achie= ve this goal.

 

Mention has been made to TCP-like flow cont= rol mechanisms as a model - which

are indeed receiver based. However, there a= re significant differences between

TCP sessions and IGP flooding.

 

TCP consists of a single session between tw= o endpoints. Resources

(primarily buffer space) for this session a= re typically allocated in the

control plane and current usage is easily m= easurable..

 

IGP flooding is point-to-multi-point, resou= rces to support IGP flooding

involve both control plane queues and datap= lane queues, both of which are

typically not per interface - nor even dedi= cated to a particular protocol

instance. What input is required to optimiz= e receiver-based flow control is not fully specified.

 

https://datatracker.ietf.org/doc/= draft-decraene-lsr-isis-flooding-speed/ suggests (Section 5) that the values

to be advertised:

 

"use a formula based on an off line te= sts of

   the overall LSPDU processing s= peed for a particular set of hardware

   and the number of interfaces c= onfigured for IS-IS"

 

implying that the advertised value is inten= tionally not dynamic. As such,

it could just as easily be configured on th= e transmit side and not require

additional signaling. As a static value, it= would necessarily be somewhat

conservative as it has to account for the w= orst case under the current

configuration - which means it needs to con= sider concurrent use of the CPU

and dataplane by all protocols/features whi= ch are enabled on a router - not all of whose

use is likely to be synchronized with peak = IS-IS flooding load.

[Bruno] _Assuming= _ that the parameters are static, those parameters

o   are the same as = the one implemented (configured) on multiple implementations, including the one from your employer. Now do you believe that those parame= ters can be determined?

=A7  If yes, how do y= ou do _today_ on your implementation? (this seems to contradict your statement that you have no way to figure out how = to find the right value)

=A7  If no, why did y= ou implement those parameters, and ask network operator to configure them?

=A7  There is also th= e option to reply: I don’t know but don’t care as I leave the issue to the network operator.

o   can still provid= e some form of dynamicity, by using the PSNP as dynamic acknowledgement.

o   are really depen= dent on the receiver, not the sender.

=A7  the sender will = never overload itself.

=A7  The receiver has= more information,  knowing its processing power = (low end, high end, 80s, 20s (currently we are stuck with 20 years old valu= e assuming the worst possible receiver (and worst there were, including wit= h packet processing partly done in the control plane processor)), its expected IS-IS load (#neighbors), its prefe= rence for bursty LSP reception (high delay between IS-I= S CPU allocation cycles, memory not an issue up to x kilo-octet…), it= s expected control plane load if IS-IS traffic has not higher priority over= other control plane traffic…), it’s expected level of QoS prioritization [1]

=B7       =    [1] looks for “Extended SPD Headroom”. E.g. “Since IGP and link stability are more tenuous and more= crucial than BGP stability, such packets are now given the highest priorit= y and are given extended SPD headroom with a default of 10 packets. This means that these packets are not dropped if the size o= f the input hold queue is lower than 185 (input queue default size + spd headroom size + spd extended headroom).”<= o:p>

o   And this is for = distributed architecture, 15 years ago. So what about using the above number (in the router configuration), applies Tony&#= 8217;s proposal (*oversubscription/number of IS neighbhors), and advertise this value to your= LSP sender?

 =

[1] https://www.cisco.com/c/en/us/support/docs/routers/12000-series-routers/299= 20-spd.html

 =

- =           

--Bruno

 

 

Unless a good case can be made as to why tr= ansmit-based flow control is not a good

fit and why receiver-based flow control is = demonstrably better, it seems

unnecessary to extend the protocol.

 

    Les

 

 

From: Lsr <lsr-bounces@ietf.org> On Behalf Of Les Ginsberg (ginsberg)
Sent: Tuesday, February 18, 2020 6:25 PM
To: lsr@ietf.org
Subject: [Lsr] Flow Control Discussion for IS-IS Flooding Speed=

 

Two recent drafts advocate for the use of f= aster LSP flooding speeds in IS-IS:

 

https://datatracker.ietf.org/doc/= draft-decraene-lsr-isis-flooding-speed/

https://datatracker.ietf.org/doc/= draft-ginsberg-lsr-isis-flooding-scale/

 

There is strong agreement on two key points= :

 

1)Modern networks require much faster flood= ing speeds than are commonly in use today

 

2)To deploy faster flooding speeds safely s= ome form of flow control is needed

 

The key point of contention between the two= drafts is how flow control should be implemented.

 

https://datatracker.ietf.org/doc/= draft-decraene-lsr-isis-flooding-speed/ advocates for a receiver based flow control where the receiver advertises = in hellos the parameters which indicate the rate/burst size which the recei= ver is capable of supporting on the interface. Senders are required to limi= t the rate of LSP transmission on that interface in accordance with the values advertised by the receiver.

 

https://datatracker.ietf.org/doc/= draft-ginsberg-lsr-isis-flooding-scale/  advocates for a transmit based flow control where the transmitter mo= nitors the number of unacknowledged LSPs sent on each interface and impleme= nts a backoff algorithm to slow the rate of sending LSPs based on the lengt= h of the per interface unacknowledged queue.

 

While other differences between the two dra= fts exist, it is fair to say that if agreement could be reached on the form= of flow control  then it is likely other issues could be resolved easily.

 

This email starts the discussion regarding = the flow control issue.

 

 

______________________________________________________________________=
___________________________________________________

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

This message and its attachments may contain confidential or privileged inf=
ormation that may be protected by law;
they should not be distributed, used or copied without authorisation.
If you have received this email in error, please notify the sender and dele=
te this message and its attachments.
As emails may be altered, Orange is not liable for messages that have been =
modified, changed or falsified.
Thank you.
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4FNd7k70HzFj0RJ0X1B5tB7eCIkn8PLGAwYN7f/l0q8nc7My6phcFHkL2B3ffZxoWFdG YlJQcBNzceeA3GyIXFE/j2hRdhP3Yg7QwUdjWGT/IEXBGeFpuRq5j1mvIukk2nSNFBXm ESjedqjD0MBKpMShH7TGDgFfL4+6n/qKLx1UXzem01ODbefzNmnUrcuoM9fM6ZPZo+yv 4ORg== X-Gm-Message-State: APjAAAWc71cocFGr9z/UY5WRkPLlaiuDahpyMOUTYyzkj9ZzD80Td3/D IDqGJ0WgBwbeMtx+yLKIJd/xn1CFC55TV1/SKRyBwr/5 X-Google-Smtp-Source: APXvYqzQJaHuKVFo3/U2/qTP4oxByRrgDW9SDWyxNtzDEOXWHwZu+O9eser1QmzG/KVM5jsPZGxSu4nGaXa9TLASOiI= X-Received: by 2002:aed:2e02:: with SMTP id j2mr72898qtd.370.1582822616336; Thu, 27 Feb 2020 08:56:56 -0800 (PST) MIME-Version: 1.0 From: Chris Bowers Date: Thu, 27 Feb 2020 10:54:11 -0600 Message-ID: To: lsr@ietf.org Content-Type: multipart/alternative; boundary="000000000000ca1464059f919be0" Archived-At: Subject: [Lsr] clarification of locator block and locator node in draft-ietf-lsr-isis-srv6-extensions X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 27 Feb 2020 16:57:06 -0000 --000000000000ca1464059f919be0 Content-Type: text/plain; charset="UTF-8" LSR WG, Section 9 of draft-ietf-lsr-isis-srv6-extensions-05 defines the SRv6 SID Structure Sub-Sub-TLV. In particular, it defines encoding for the locator block length and the locator node length. The text refers to [I-D.ietf-spring-srv6-network-programming] for the definition of these concepts. As far as I can tell, the only reference to locator block and locator node in draft-ietf-spring-srv6-network-programming-10 is section 3.1 which has the following text: A locator may be represented as B:N where B is the SRv6 SID block (IPv6 subnet allocated for SRv6 SIDs by the operator) and N is the identifier of the parent node instantiating the SID. I think that we need a much more detailed description of the locator block and locator node. Thanks, Chris --000000000000ca1464059f919be0 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
LSR WG,

Section 9 of draft-ietf-lsr-isis-srv= 6-extensions-05 defines the=C2=A0 SRv6 SID Structure Sub-Sub-TLV. In particular, it defines encoding for the = locator block length and the locator node length.=C2=A0 The text refers to= =20 [I-D.ietf-spring-srv6-network-programming] for the definition of these conc= epts.
As far as I can t= ell, the only reference to=20 locator block and locator node in draft-ietf-spring-srv6-network-programmin= g-10 is section 3.1 which has the following text:
   A locator may be represented as B:N where B is the SRv6 SID block
   (IPv6 subnet allocated for SRv6 SIDs by the operator) and N is the
   identifier of the parent node instantiating the SID.

<=
font face=3D"arial,sans-serif">I think that we need a much more detailed de=
scription of the locator block and locator node.
Thanks,
Chris

--000000000000ca1464059f919be0-- From nobody Thu Feb 27 09:08:54 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 0869E3A0CF1 for ; Thu, 27 Feb 2020 09:08:46 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -9.601 X-Spam-Level: X-Spam-Status: No, score=-9.601 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIMWL_WL_MED=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, SPF_PASS=-0.001, URIBL_BLOCKED=0.001, USER_IN_DEF_DKIM_WL=-7.5] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=cisco.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id wl7mUrF_xc-M for ; Thu, 27 Feb 2020 09:08:44 -0800 (PST) Received: from aer-iport-3.cisco.com (aer-iport-3.cisco.com [173.38.203.53]) (using TLSv1.2 with cipher DHE-RSA-SEED-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 652293A0D11 for ; Thu, 27 Feb 2020 09:08:44 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=1113; q=dns/txt; s=iport; t=1582823324; x=1584032924; h=subject:to:references:from:message-id:date:mime-version: in-reply-to:content-transfer-encoding; bh=X0eglcBCvtGmJWboUam6NvOhnwehjGn7KDHNgVpQkF0=; b=TZ9NtYBZsiOmwD2s9xatvblcuizkjnqVFCVxSWqBk8T2eXMM/TAcMpyi hQendDnsPIhc215RgHeJoayuZD7aBtA2LHeqP8S4Wy+tAAdi1m9p/zUrG GH6ELur1pzmSKtozkQK8CTTZZcHFoOelEciSpDGZgkZq0g+Mf75df9VIT s=; X-IPAS-Result: =?us-ascii?q?A0BtAwAK91de/xbLJq1mHAEBAQEBBwEBEQEEBAEBgXuDa?= =?us-ascii?q?iAShD6JA4gLmz0JAQEBDi8EAQGEQAKCLDgTAgMBAQEDAgMBAQEBBQEBAQIBB?= =?us-ascii?q?QRthUOFYwEBAQECASMPAQVRCxgCAiYCAlcGAQwIAQGDIoJcIK8bdYEyhUqDO?= =?us-ascii?q?YE+gQ4qjD+BQT+BOII+Lj6HXIJeBLAWgkaCUZQOBhyPC4wjjnCbb4FpIoFYM?= =?us-ascii?q?xoIGxWDKE8YDY4pFxWOEUADj2MBAQ?= X-IronPort-Anti-Spam-Filtered: true X-IronPort-AV: E=Sophos;i="5.70,492,1574121600"; d="scan'208";a="21504418" Received: from aer-iport-nat.cisco.com (HELO aer-core-1.cisco.com) ([173.38.203.22]) by aer-iport-3.cisco.com with ESMTP/TLS/DHE-RSA-SEED-SHA; 27 Feb 2020 17:08:24 +0000 Received: from [10.60.140.52] (ams-ppsenak-nitro3.cisco.com [10.60.140.52]) by aer-core-1.cisco.com (8.15.2/8.15.2) with ESMTP id 01RH8O3g014832; Thu, 27 Feb 2020 17:08:24 GMT To: Chris Bowers , lsr@ietf.org References: From: Peter Psenak Message-ID: Date: Thu, 27 Feb 2020 18:08:24 +0100 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:60.0) Gecko/20100101 Thunderbird/60.7.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit X-Outbound-SMTP-Client: 10.60.140.52, ams-ppsenak-nitro3.cisco.com X-Outbound-Node: aer-core-1.cisco.com Archived-At: Subject: Re: [Lsr] clarification of locator block and locator node in draft-ietf-lsr-isis-srv6-extensions X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 27 Feb 2020 17:08:52 -0000 Hi Chris, On 27/02/2020 17:54, Chris Bowers wrote: > LSR WG, > > Section 9 of draft-ietf-lsr-isis-srv6-extensions-05 defines the  SRv6 > SID Structure Sub-Sub-TLV. In particular, it defines encoding for the > locator block length and the locator node length.  The text refers to > [I-D.ietf-spring-srv6-network-programming] for the definition of these > concepts. > > As far as I can tell, the only reference to locator block and locator > node in draft-ietf-spring-srv6-network-programming-10 is section 3.1 > which has the following text: > > A locator may be represented as B:N where B is the SRv6 SID block > (IPv6 subnet allocated for SRv6 SIDs by the operator) and N is the > identifier of the parent node instantiating the SID. > > I think that we need a much more detailed description of the locator > block and locator node. sure, but that would be in the draft-ietf-spring-srv6-network-programming-10, not in draft-ietf-lsr-isis-srv6-extensions, as these are not a protocol specific constructs. thanks, Peter > > Thanks, > > Chris > From nobody Thu Feb 27 09:18:51 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id A23F63A0D6A; Thu, 27 Feb 2020 09:18:41 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.097 X-Spam-Level: X-Spam-Status: No, score=-2.097 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=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 qipfDdIdnM7O; Thu, 27 Feb 2020 09:18:40 -0800 (PST) Received: from mail-qv1-xf35.google.com (mail-qv1-xf35.google.com [IPv6:2607:f8b0:4864:20::f35]) (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 163583A0D69; Thu, 27 Feb 2020 09:18:40 -0800 (PST) Received: by mail-qv1-xf35.google.com with SMTP id bo12so1034478qvb.13; Thu, 27 Feb 2020 09:18:40 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=R9lR+T+it4zXhO0VHI513uRYuauDnEwKY8nbzxlXDBk=; b=KTzPfuVQSRiTIHU3aTyFcLgtSRFdb+QBSVT/Oo76EJEWYE/TgxerEwAn2G5HDgaKYk 8X58Gl+ghuSdqJobIDjGOwQdX4KqRBknYImoCX2NL2T7/CLYfDti4AAf67G8n6mwAv4q YU382ywi9O5K5Taha6VJP+NMwy/rs3Z8eZiMtTatUMZ+4rFehKb4sfZB0hLfzPai+6Hg uuCim4CGAbzWaG3rrXmbZKQ7RKNZYPgYbYGpXqohFt+jbn47AdI6JhxPwLqcRk2aHgpm 5z09a9+As8Z9pNmnQSDbo3EtEAzhGO3Z/STEfZOUcG80XR/bYqqsSlgo55A5427PqyXU g5kg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=R9lR+T+it4zXhO0VHI513uRYuauDnEwKY8nbzxlXDBk=; b=Mr0NlXb8SxR4akn24Kk+7/fXe4+ZkxJMchwQcNPcq7FXmUKf155noLJHNEyBM+56KD G5At/LGYxxLc62SlUzGlfFjNFVNlvXLBzkymudpnNCiLic7q3qyXphyw6TYTQl9tH39y +YWheuzrcuRx43QLJzRzCJu86EkAU3bPYTGYzXuFLOjy0fiesWAJamyjnsPQnjHtswDF javgxG/jsZDSZtdzcaI6CdNZWxX8ZF7M+Whb4VkMsOvLKNNvZ3selPb+4USNX7LkUr1I 6xRxuZFSNEt3hMz3n30Jfd0cXKvc+L68KIgwdFQtyaGXljZdQqWe/eBpJamfiPgs41aw 8bTA== X-Gm-Message-State: APjAAAVsnH1akJOckHq20Oyqn43pB5LsCjIhTVWzlFlTDqU2We42EDoP c2D2XbuWgN51zdY4noPg9t4afIFqWyoH6HxvgCJSa6ww X-Google-Smtp-Source: APXvYqydXwtAcnpRBdOQAy3dLb95vgCxJmWZnysoCYKPh10qPKUTai9uxpAEQzkYW+wUfWsg4B14J01HF8yRysf1EXM= X-Received: by 2002:ad4:4dce:: with SMTP id cw14mr837681qvb.162.1582823919030; Thu, 27 Feb 2020 09:18:39 -0800 (PST) MIME-Version: 1.0 References: In-Reply-To: From: Chris Bowers Date: Thu, 27 Feb 2020 11:15:54 -0600 Message-ID: To: lsr@ietf.org, SPRING WG List Cc: Peter Psenak Content-Type: multipart/alternative; boundary="0000000000006f9efa059f91e933" Archived-At: Subject: [Lsr] clarification of locator block and locator node in draft-ietf-spring-srv6-network-programming and draft-ietf-lsr-isis-srv6-extensions X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 27 Feb 2020 17:18:42 -0000 --0000000000006f9efa059f91e933 Content-Type: text/plain; charset="UTF-8" SPRING and LSR WGs, I think that we need a much more detailed description of the locator block and locator node in either draft-ietf-spring-srv6-network-programming or draft-ietf-lsr-isis-srv6-extensions. See original email below. Thanks, Chris On Thu, Feb 27, 2020 at 11:08 AM Peter Psenak wrote: > Hi Chris, > > On 27/02/2020 17:54, Chris Bowers wrote: > > LSR WG, > > > > Section 9 of draft-ietf-lsr-isis-srv6-extensions-05 defines the SRv6 > > SID Structure Sub-Sub-TLV. In particular, it defines encoding for the > > locator block length and the locator node length. The text refers to > > [I-D.ietf-spring-srv6-network-programming] for the definition of these > > concepts. > > > > As far as I can tell, the only reference to locator block and locator > > node in draft-ietf-spring-srv6-network-programming-10 is section 3.1 > > which has the following text: > > > > A locator may be represented as B:N where B is the SRv6 SID block > > (IPv6 subnet allocated for SRv6 SIDs by the operator) and N is the > > identifier of the parent node instantiating the SID. > > > > I think that we need a much more detailed description of the locator > > block and locator node. > > sure, but that would be in the > draft-ietf-spring-srv6-network-programming-10, not in > draft-ietf-lsr-isis-srv6-extensions, as these are not a protocol > specific constructs. > > thanks, > Peter > > > > > Thanks, > > > > Chris > > > > --0000000000006f9efa059f91e933 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
SPRING and LSR WGs,

I thin= k that we need a much more detailed description of the locator block and lo= cator node in either draft-ietf-spring-srv6-network-programming or draft-ie= tf-lsr-isis-srv6-extensions.=C2=A0 See original email below.

Thanks,
Chris
<= br>
O= n Thu, Feb 27, 2020 at 11:08 AM Peter Psenak <ppsenak@cisco.com> wrote:
Hi Chris,

On 27/02/2020 17:54, Chris Bowers wrote:
> LSR WG,
>
> Section 9 of draft-ietf-lsr-isis-srv6-extensions-05 defines the=C2=A0 = SRv6
> SID Structure Sub-Sub-TLV. In particular, it defines encoding for the =
> locator block length and the locator node length.=C2=A0 The text refer= s to
> [I-D.ietf-spring-srv6-network-programming] for the definition of these=
> concepts.
>
> As far as I can tell, the only reference to locator block and locator =
> node in draft-ietf-spring-srv6-network-programming-10 is section 3.1 <= br> > which has the following text:
>
>=C2=A0 =C2=A0 =C2=A0A locator may be represented as B:N where B is the = SRv6 SID block
>=C2=A0 =C2=A0 =C2=A0(IPv6 subnet allocated for SRv6 SIDs by the operato= r) and N is the
>=C2=A0 =C2=A0 =C2=A0identifier of the parent node instantiating the SID= .
>
> I think that we need a much more detailed description of the locator <= br> > block and locator node.

sure, but that would be in the
draft-ietf-spring-srv6-network-programming-10, not in
draft-ietf-lsr-isis-srv6-extensions, as these are not a protocol
specific constructs.

thanks,
Peter

>
> Thanks,
>
> Chris
>

--0000000000006f9efa059f91e933-- From nobody Thu Feb 27 09:46:57 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id E1A803A0C9E for ; Thu, 27 Feb 2020 09:46:55 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.096 X-Spam-Level: X-Spam-Status: No, score=-2.096 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_IMAGE_RATIO_04=0.001, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id xoWdVS8S0F6t for ; Thu, 27 Feb 2020 09:46:54 -0800 (PST) Received: from mail-il1-x12e.google.com (mail-il1-x12e.google.com [IPv6:2607:f8b0:4864:20::12e]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 2AFB33A0C5C for ; Thu, 27 Feb 2020 09:46:54 -0800 (PST) Received: by mail-il1-x12e.google.com with SMTP id x2so303329ila.9 for ; Thu, 27 Feb 2020 09:46:54 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=95KGso3PQ2/F2dOu1cWruGKOnO7b3vufIx8zmTX+aQ8=; b=GO5/fX2e92WGv6RvHSZ0BpumKL48+PdlpAFKveaSUXoZH+vY3IwzWlKaKc64zFTYZ3 TYZJLvOdFrGJNC4VljzixiUEuvCzwvfu+ZOVilcBtlYegWJKzgrfuqhJ3ww8wsiJveEP MCKCeT64rsH3UKYaeRhqAEpfJj9YavjQQoe9V9ZQs2VBLMewK6lt9aoc/xdGtNASbFtA g48nYoDHhTKdxnFGsobmfDkpYju2lpyDziQXL7jXOMGOwNdwtQN23js0gGSxm5c8b+Y2 T0nthy61mkgUjA8Fjo7thVlY8iK8I46khCm/WoFGT/NKofYeeCv9IMIfZUOThvcAMXC4 g0FQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=95KGso3PQ2/F2dOu1cWruGKOnO7b3vufIx8zmTX+aQ8=; b=qcEUwoGvu3fzlWJb+qSjXOQdPOmRi/pPQievC9Y1y9p+a506HAQekdrEsUKAB4hoLD 9y5ZGARbsXxjQD8ci6FqnVZhMT9jLlk2RUOOM4CZpq7neNXdxvOj0cW1nb3Pk+FclTiY oD865GKSZu2HzmbhMtwu/UaEgE1B5xgBq9Wh1aMGZTyX2f5Iw9MF5H46wSawuKZjeS+/ nTtGayP3O44ufhBumZ8wHdC45yl2dMMUNLNT0S1gK19N2OqMIoRSaiqI/sNWvR4JXwcF QCdKb33Eg1xISDVJsaeE/qALq9nn2Idz4WLf+dKOwdmqvWdEfRsrRyruNzxPrHzwXx1l NsDw== X-Gm-Message-State: APjAAAUs64r3oxHadOWBcjm8Oghz4EPo3C73+ZTyt3fRggXvrONcNAdo OK8n5n5/+xkBsTTv4Jjxtazh7kbcE6Rt9IpKpgUinw== X-Google-Smtp-Source: APXvYqy7s70wkVXMXRf9H7Af6oDF/vxw9SeSYvAsBK830UEM2MLzEhjBo8B+Iz6+KWDUR7JTr7x/YVaryal3F9fJ724= X-Received: by 2002:a92:194c:: with SMTP id e12mr446702ilm.12.1582825613195; Thu, 27 Feb 2020 09:46:53 -0800 (PST) MIME-Version: 1.0 References: In-Reply-To: From: Sergey SHpenkov Date: Thu, 27 Feb 2020 20:44:36 +0300 Message-ID: To: "Acee Lindem (acee)" Cc: "lsr@ietf.org" Content-Type: multipart/related; boundary="0000000000006afd46059f924e97" Archived-At: Subject: Re: [Lsr] Question about OSPF (transit area routing loop) X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 27 Feb 2020 17:46:56 -0000 --0000000000006afd46059f924e97 Content-Type: multipart/alternative; boundary="0000000000006afd44059f924e96" --0000000000006afd44059f924e96 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hi Acee, Yes, I was able to reproduce the loop Thanks, Sergey =D1=87=D1=82, 27 =D1=84=D0=B5=D0=B2=D1=80. 2020 =D0=B3. =D0=B2 19:54, Acee = Lindem (acee) : > Hi Sergey, > > > > Have you reproduced the loop with routers? I definitely agree that ABR_1 > will prefer the path to the ASBR through area 100. I think there is some > ambiguity as to the cost it uses in its ASBR-Summary LSA injected into ar= ea > 200. > > > > Thanks, > > Acee > > > > *From: *Lsr on behalf of Sergey SHpenkov < > sergey.v.shpenkov@gmail.com> > *Date: *Wednesday, February 26, 2020 at 2:22 AM > *To: *"lsr@ietf.org" > *Subject: *Re: [Lsr] Question about OSPF (transit area routing loop) > > > > Acee, > > > > Because ABR_1 creates SumLSA-4 for the ASBR not from the backbone > area. The cost of SumLSA-4 for ASBR is 300. > > > > Thanks, > > Sergey > > > > =D0=B2=D1=82, 25 =D1=84=D0=B5=D0=B2=D1=80. 2020 =D0=B3. =D0=B2 22:44, Ace= e Lindem (acee) : > > Hi Sergey, > > I don=E2=80=99t see why RT_1 wouldn=E2=80=99t go through ABR_1 to get to = the ASBR. > > Thanks, > > Acee > > > > *From: *Lsr on behalf of Sergey SHpenkov < > sergey.v.shpenkov@gmail.com> > *Date: *Tuesday, February 25, 2020 at 2:38 PM > *To: *"lsr@ietf..org " > *Subject: *[Lsr] Question about OSPF (transit area routing loop) > > > > Hi, > > In section 16.3 of the OSPF RFC 2328 standard, it is stated that all ABR > routers > > connected to a transit area are required to check the sumLSA contained > within > > this area in order to possibly improve the intra-area and inter-area > backbone routes > > for themselves. > > > See the picture: > > The RT_1 and ABR_3 routers will use different paths to the ASBR router: > > ABR_3 -> RT_1 -> ABR_1 -> ASBR =3D cost 3 > RT_1 -> ABR_3 -> ABR_2 -> ASBR =3D cost 21 > > route loop between RT_1 and ABR_3 > > Please explain this situation > > Thanks, > Sergey > > > > --0000000000006afd44059f924e96 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable

Hi Acee,

Yes, I was able to reproduce the loop

= Thanks,
Sergey

=D1=87=D1=82, 27 =D1=84=D0=B5=D0=B2= =D1=80. 2020 =D0=B3. =D0=B2 19:54, Acee Lindem (acee) <acee@cisco.com>:

Hi Sergey,

=C2=A0

Have you reproduced the loop with routers? I definit= ely agree that ABR_1 will prefer the path to the ASBR through area 100. I t= hink there is some ambiguity as to the cost it uses in its ASBR-Summary LSA= injected into area 200.

=C2=A0

Thanks,

Acee

=C2=A0

From: Lsr <lsr-bounces@ietf.org> o= n behalf of Sergey SHpenkov <sergey.v.shpenkov@gmail.com>
Date: Wednesday, February 26, 2020 at 2:22 AM
To: "lsr@ietf= .org" <lsr@ie= tf.org>
Subject: Re: [Lsr] Question about OSPF (transit area routing loop)

=C2=A0

Acee,

=C2=A0

Becaus= e ABR_1 creates SumLSA-4 for the ASBR not from the backbone area.=C2=A0The = cost of SumLSA-4 for ASBR is 300.



Thanks= ,

Sergey=

=C2=A0

=D0=B2=D1=82, 25 =D1=84= =D0=B5=D0=B2=D1=80. 2020 =D0=B3. =D0=B2 22:44, Acee Lindem (acee) <acee@cisco.com>:

Hi Sergey,

I don=E2=80=99t see why RT_1 wouldn=E2=80=99t go through ABR_1 to get to th= e ASBR.

Thanks,

Acee

=C2=A0

From: Lsr <lsr-bounces@ietf.org> on behalf of Sergey SHp= enkov <= sergey.v.shpenkov@gmail.com>
Date: Tuesday, February 25, 2020 at 2:38 PM
To: "lsr@ietf= ..org" <lsr@i= etf.org>
Subject: [Lsr] Question about OSPF (transit area routing loop)

=C2=A0

Hi,

In section 16.3 of the OSPF RFC 2328 standard, it is stated that all ABR ro= uters

connected to a transit area are required to check the sumLSA contained with= in

this area in order to possibly improve the intra-area and inter-area backbo= ne routes

for themselves.


See the picture:

The RT_1 and ABR_3 routers will use different paths to the ASBR router:

ABR_3 -> RT_1 -> ABR_1 -> ASBR =3D cost 3
RT_1 -> ABR_3 -> ABR_2 -> ASBR =3D cost 21

route loop between RT_1 and ABR_3

Please explain this situation

Thanks,
Sergey

=C2=A0

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Content-Transfer-Encoding: 7bit From: internet-drafts@ietf.org To: Cc: lsr@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 6.119.0 Auto-Submitted: auto-generated Precedence: bulk Reply-To: lsr@ietf.org Message-ID: <158286110733.12854.5293352940517475649@ietfa.amsl.com> Date: Thu, 27 Feb 2020 19:38:27 -0800 Archived-At: Subject: [Lsr] I-D Action: draft-ietf-isis-te-app-11.txt X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 28 Feb 2020 03:38:28 -0000 A New Internet-Draft is available from the on-line Internet-Drafts directories. This draft is a work item of the Link State Routing WG of the IETF. Title : IS-IS TE Attributes per application Authors : Les Ginsberg Peter Psenak Stefano Previdi Wim Henderickx John Drake Filename : draft-ietf-isis-te-app-11.txt Pages : 20 Date : 2020-02-27 Abstract: Existing traffic engineering related link attribute advertisements have been defined and are used in RSVP-TE deployments. Since the original RSVP-TE use case was defined, additional applications (e.g., Segment Routing Traffic Engineering, Loop Free Alternate) have been defined which also make use of the link attribute advertisements. In cases where multiple applications wish to make use of these link attributes the current advertisements do not support application specific values for a given attribute nor do they support indication of which applications are using the advertised value for a given link. This document introduces new link attribute advertisements which address both of these shortcomings. The IETF datatracker status page for this draft is: https://datatracker.ietf.org/doc/draft-ietf-isis-te-app/ There are also htmlized versions available at: https://tools.ietf.org/html/draft-ietf-isis-te-app-11 https://datatracker.ietf.org/doc/html/draft-ietf-isis-te-app-11 A diff from the previous version is available at: https://www.ietf.org/rfcdiff?url2=draft-ietf-isis-te-app-11 Please note that it may take a couple of minutes from the time of submission until the htmlized version and diff are available at tools.ietf.org. Internet-Drafts are also available by anonymous FTP at: ftp://ftp.ietf.org/internet-drafts/ From nobody Thu Feb 27 20:00:29 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 75AF03A0EBD; Thu, 27 Feb 2020 20:00:26 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -9.59 X-Spam-Level: X-Spam-Status: No, score=-9.59 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, SPF_PASS=-0.001, T_SPF_HELO_TEMPERROR=0.01, URIBL_BLOCKED=0.001, USER_IN_DEF_DKIM_WL=-7.5] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=cisco.com header.b=hWSF4uTp; dkim=pass (1024-bit key) header.d=cisco.onmicrosoft.com header.b=dyVwfN7h Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) 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Talaulikar (ketant)" , "Ketan Talaulikar (ketant)" , Chris Bowers CC: "lsr@ietf.org" , SPRING WG List , draft-ietf-spring-srv6-network-programming , "Peter Psenak (ppsenak)" Thread-Topic: [Lsr] clarification of locator block and locator node in draft-ietf-spring-srv6-network-programming and draft-ietf-lsr-isis-srv6-extensions Thread-Index: AQHV7ZILnZjIpKq3N0WdLR4BCssnCqgwFDqggAA7KhCAABElwIAASL5A Date: Fri, 28 Feb 2020 14:23:56 +0000 Message-ID: <7453_1582899837_5E59227C_7453_80_1_53C29892C857584299CBF5D05346208A48DD14BA@OPEXCAUBM43.corporate.adroot.infra.ftgroup> References: <12659_1582880639_5E58D77F_12659_66_1_53C29892C857584299CBF5D05346208A48DCA80D@OPEXCAUBM43.corporate.adroot.infra.ftgroup> In-Reply-To: Accept-Language: fr-FR, en-US Content-Language: fr-FR X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.114.13.245] Content-Type: multipart/alternative; boundary="_000_53C29892C857584299CBF5D05346208A48DD14BAOPEXCAUBM43corp_" MIME-Version: 1.0 Archived-At: Subject: Re: [Lsr] clarification of locator block and locator node in draft-ietf-spring-srv6-network-programming and draft-ietf-lsr-isis-srv6-extensions X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 28 Feb 2020 14:24:01 -0000 --_000_53C29892C857584299CBF5D05346208A48DD14BAOPEXCAUBM43corp_ Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 SGkgS2V0YW4sDQoNClRoYW5rcyBmb3J0IHRoZSBmb2xsb3cgdXAuDQpDbGFyaWZpY2F0aW9uIGlu bGluZSBbQnJ1bm9dDQoNCkZyb206IEtldGFuIFRhbGF1bGlrYXIgKGtldGFudCkgW21haWx0bzpr ZXRhbnRAY2lzY28uY29tXQ0KU2VudDogRnJpZGF5LCBGZWJydWFyeSAyOCwgMjAyMCAxMToxMSBB TQ0KVG86IERFQ1JBRU5FIEJydW5vIFRHSS9PTE47IEtldGFuIFRhbGF1bGlrYXIgKGtldGFudCk7 IENocmlzIEJvd2Vycw0KQ2M6IGxzckBpZXRmLm9yZzsgU1BSSU5HIFdHIExpc3Q7IGRyYWZ0LWll dGYtc3ByaW5nLXNydjYtbmV0d29yay1wcm9ncmFtbWluZzsgUGV0ZXIgUHNlbmFrIChwcHNlbmFr 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(PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:from:date:message-id:subject:to; bh=fBTUtudYYhDACNy6+2LxyEKBrWIaufrIEkUkdDOzVRE=; b=bJd7Gdj+I1zDwxVmXKidR5TMXXxsc4bCNs1VvxA1PzSkIKZ86xZaEP5eb4mSMt62sv it8S7qdKaDFBmGKNomP9bXyWfNhpi+z29/wggJFAZYaV+e5HYamFSaTU8Wy5IGWo7k31 xfDL8ZWUvX/W/JNxlhOo/YUIJDPw2hEySjCm6MNzIKo/Dmi12HnRD4cEHpY9ytYKR+pp xrVNxgDSO2QVMogmsND3SasKF9UxjI6epYR6f4ARGEQ/BKWDJIZtXnZvrmzsquhDxPPK 66CyDpSnBShi0pLFTtZ4cJpBwmUUuIBEs0/aLtXKlhmgfQW93Z5MPNCfCtlKJ71TN8yF F5sw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:from:date:message-id:subject:to; bh=fBTUtudYYhDACNy6+2LxyEKBrWIaufrIEkUkdDOzVRE=; b=LN8pBLG1CFNjeMSzPPpXrX9LnttiUUkCC2PkP2B7yCJEho5IzDUpejMyeya973Cahf ZV9A8MnvA9qigOBsh/PxPNche3Kq3cTugLlDV6+a8X/ztI83fnrNNtcJkcwsKVW4IOtj YRi+1Ytrg6yXv3ww6hmMasC96QxM3BBHAJ/1EbQHmolQ3SKGm5ebAjH/AfpcGVIQlFuA 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19:57:08 -0000 --000000000000e5a4ef059fa83d04 Content-Type: text/plain; charset="UTF-8" Hi all, We're now accepting agenda request for the LSR Working Grouping meeting IETF 107. Please send your requests to lsr-chairs@ietf.org indicating draft name, speaker, and desired duration (covering presentation and discussion). If you plan to present remotely, please let us know so we can make the arrangements with the Meetecho team. Thanks, Yingzhen --000000000000e5a4ef059fa83d04 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hi all,

We're now accepting agen= da request for the LSR Working Grouping meeting IETF 107. Please send your = requests to=C2=A0lsr-chairs@ietf.org= =C2=A0indicating draft name, speaker, and desired duration (covering pr= esentation and discussion).=C2=A0

If you plan to present remotely, please let us know so= we can make the arrangements with the Meetecho team.

Thanks,
Yingzhen
--000000000000e5a4ef059fa83d04-- From nobody Fri Feb 28 14:37:11 2020 Return-Path: X-Original-To: lsr@ietf.org Delivered-To: lsr@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id 835DD3A1F40; Fri, 28 Feb 2020 14:35:09 -0800 (PST) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: "\"IETF Secretariat\"" To: , Cc: aretana.ietf@gmail.com, lsr@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 6.119.0 Auto-Submitted: auto-generated Precedence: bulk Message-ID: <158292930952.19931.8292265301212937372@ietfa.amsl.com> Date: Fri, 28 Feb 2020 14:35:09 -0800 Archived-At: Subject: [Lsr] lsr - Requested sessions have been scheduled for IETF 107 X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 28 Feb 2020 22:35:16 -0000 Dear Acee Lindem, The session(s) that you have requested have been scheduled. Below is the scheduled session information followed by the original request. lsr Session 1 (2:00 requested) Monday, 23 March 2020, Afternoon Session I 1330-1530 Room Name: Regency F size: 150 --------------------------------------------- lsr Session 2 (1:00 requested) Monday, 23 March 2020, Afternoon Session III 1810-1910 Room Name: Regency F size: 150 --------------------------------------------- iCalendar: https://datatracker.ietf.org/meeting/107/sessions/lsr.ics Request Information: --------------------------------------------------------- Working Group Name: Link State Routing Area Name: Routing Area Session Requester: Acee Lindem Number of Sessions: 2 Length of Session(s): 2 Hours, 1 Hour Number of Attendees: 100 Conflicts to Avoid: Chair Conflict: ipsecme idr rtgwg lsvr Technology Overlap: rift spring Key Participant Conflict: bfd bess People who must be present: Acee Lindem Christian Hopps Alvaro Retana Resources Requested: Special Requests: --------------------------------------------------------- From nobody Fri Feb 28 19:03:12 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 8C21D3A0A23; Fri, 28 Feb 2020 19:03:09 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.899 X-Spam-Level: X-Spam-Status: No, score=-1.899 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id y9PRPTUSxoov; Fri, 28 Feb 2020 19:03:07 -0800 (PST) Received: from huawei.com (lhrrgout.huawei.com [185.176.76.210]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 93E4E3A0A22; Fri, 28 Feb 2020 19:03:07 -0800 (PST) Received: from lhreml709-cah.china.huawei.com (unknown [172.18.7.106]) by Forcepoint Email with ESMTP id 1F16DDA635B91E25CC10; Sat, 29 Feb 2020 03:03:02 +0000 (GMT) Received: from DGGEML422-HUB.china.huawei.com (10.1.199.39) by lhreml709-cah.china.huawei.com (10.201.108.32) with Microsoft SMTP Server (TLS) id 14.3.408.0; Sat, 29 Feb 2020 03:03:01 +0000 Received: from DGGEML504-MBS.china.huawei.com ([169.254.11.20]) by dggeml422-hub.china.huawei.com ([10.1.199.39]) with mapi id 14.03.0439.000; Sat, 29 Feb 2020 11:02:55 +0800 From: wangyali To: "lsr-chairs@ietf.org" , "lsr@ietf.org" CC: Yingzhen Qu Thread-Topic: [Lsr] IETF 107 LSR Presentation Slot Requests Thread-Index: AQHV7nHLtmhQcGGKlEegmt1ZUAnzt6gxcoQg Date: Sat, 29 Feb 2020 03:02:54 +0000 Message-ID: <1520992FC97B944A9979C2FC1D7DB0F404D9D5C6@DGGEML504-MBS.china.huawei.com> References: In-Reply-To: Accept-Language: en-US Content-Language: zh-CN X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: 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, "lsr@ietf.org" Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Archived-At: Subject: [Lsr] AD Review of draft-ietf-isis-mpls-elc-10 X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 29 Feb 2020 05:00:36 -0000 Dear authors: This is my review of draft-ietf-isis-mpls-elc-10. =C2=A0I reviewed this document alongside draft-ietf-ospf-mpls-elc-12, so many comments are the same/similar. =C2=A0Thank you for the work in both of them! Besides the in-line comments, I want to point out here that this specification is incomplete. =C2=A0It needs to have (1) a formal description of the new MSD-Type (similar to =C2=A75/rfc8491), and (2) a discussion of the interaction with the BMI-MSD. I will progress both documents together, so I will wait for both of them to address my comments before starting their IETF LC. Thanks!! Alvaro. [Line numbers from idnits.] ... 18 Abstract 20 =C2=A0 Multiprotocol Label Switching (MPLS) has defined a mechanism to = load- 21 =C2=A0 balance traffic flows using Entropy Labels (EL). =C2=A0An ingres= s Label 22 =C2=A0 Switching Router (LSR) cannot insert ELs for packets going into = a 23 =C2=A0 given Label Switched Path (LSP) unless an egress LSR has indicat= ed 24 =C2=A0 via signaling that it has the capability to process ELs, referre= d to 25 =C2=A0 as Entropy Label Capability (ELC), on that tunnel. =C2=A0In addi= tion, it 26 =C2=A0 would be useful for ingress LSRs to know each LSR's capability f= or 27 =C2=A0 reading the maximum label stack depth and performing EL-based lo= ad- 28 =C2=A0 balancing, referred to as Entropy Readable Label Depth (ERLD). = =C2=A0This 29 =C2=A0 document defines a mechanism to signal these two capabilities us= ing 30 =C2=A0 IS-IS. =C2=A0These mechanisms are particularly useful, where lab= el 31 =C2=A0 advertisements are done via protocols like IS-IS. [nit] s/as Entropy Label Capability/as the Entropy Label Capability [minor] "protocols like IS-IS" =C2=A0That last sentence sounds as if there were other options; for example advertise labels with OSPF and then use the extensions here. =C2=A0It's just a minor point, but I think that maybe that last sentence is not needed. ... 81 1. =C2=A0Introduction 83 =C2=A0 [RFC6790] describes a method to load-balance Multiprotocol Label 84 =C2=A0 Switching (MPLS) traffic flows using Entropy Labels (EL). =C2=A0= "The Use 85 =C2=A0 of Entropy Labels in MPLS Forwarding" [RFC6790] introduces the 86 =C2=A0 concept of Entropy Label Capability (ELC) and defines the signal= ings 87 =C2=A0 of this capability via MPLS signaling protocols. =C2=A0Recently, 88 =C2=A0 mechanisms have been defined to signal labels via link-state Int= erior 89 =C2=A0 Gateway Protocols (IGP) such as IS-IS 90 =C2=A0 [I-D.ietf-isis-segment-routing-extensions]. =C2=A0In such scenar= ios, the 91 =C2=A0 defined signaling mechanisms are inadequate. =C2=A0This draft de= fines a 92 =C2=A0 mechanism to signal the ELC using IS-IS. =C2=A0This mechanism is= useful 93 =C2=A0 when the label advertisement is also done via IS-IS. [nit] s/"The Use of Entropy Labels in MPLS Forwarding" [RFC6790]/It also [nit] s/signalings/signaling [nit] "In such scenarios, the defined signaling mechanisms are inadequate." Take this sentence out: the rest of the paragraph is enough. 95 =C2=A0 In addition, in the cases where LSPs are used for whatever reaso= ns 96 =C2=A0 (e.g., SR-MPLS [I-D.ietf-spring-segment-routing-mpls]), it would= be 97 =C2=A0 useful for ingress LSRs to know each intermediate LSR's capabili= ty of 98 =C2=A0 reading the maximum label stack depth and performing EL-based lo= ad- 99 =C2=A0 balancing. =C2=A0This capability, referred to as Entropy Readabl= e Label 100 =C2=A0 Depth (ERLD) as defined in [I-D.ietf-mpls-spring-entropy-label]= may 101 =C2=A0 be used by ingress LSRs to determine the position of the EL lab= el in 102 =C2=A0 the stack, and whether it's necessary to insert multiple ELs at 103 =C2=A0 different positions in the label stack. [nit] s/in the cases where LSPs are used for whatever reasons/in cases where LSPs are used 105 2. =C2=A0Terminology 107 =C2=A0 This memo makes use of the terms defined in [RFC6790], [RFC4971= ] and 108 =C2=A0 [I-D.ietf-mpls-spring-entropy-label]. [minor] I'm not sure why rfc4971 is referenced here; what terminology is needed from it? ... 116 3. =C2=A0Advertising ELC Using IS-IS 118 =C2=A0 Even though ELC is a property of the node, in some cases it is 119 =C2=A0 advantageous to associate and advertise the ELC with a prefix. = =C2=A0In a 120 =C2=A0 multi-area network, routers may not know the identity of the pr= efix 121 =C2=A0 originator in a remote area, or may not know the capabilities o= f such 122 =C2=A0 originator. =C2=A0Similarly in a multi-domain network, the iden= tity of the 123 =C2=A0 prefix originator and its capabilities may not be known to the 124 =C2=A0 ingress LSR. [minor] Is there a difference that are you trying to highlight between multi-area and multi-domain? =C2=A0The last two sentences seem redundant to me; using "domain" should be enough. 126 =C2=A0 One bit of the "Bit Values for Prefix Attribute Flags Sub-TLV" 127 =C2=A0 registry defined in [RFC7794] (Bit 3 is desired) is to be assig= ned by 128 =C2=A0 the IANA for the ELC. =C2=A0If a router has multiple line cards= , the 129 =C2=A0 router MUST NOT announce the ELC for any prefixes that are loca= lly 130 =C2=A0 attached unless all of its line-cards are capable of processing= ELs. 131 =C2=A0 If a router supports ELs on all of its line-cards, it SHOULD se= t the 132 =C2=A0 ELC for every local host prefix it advertises in IS-IS. [major] The first sentence is not needed because IANA has already assigned the bit, and any requests should be in the IANA Considerations section. =C2=A0Perhaps change to something like: =C2=A0 =C2=A0 =C2=A0 Bit 3 in the Prefix Attribute Flags [RFC7794] is used = as the ECL Flag =C2=A0 =C2=A0 =C2=A0 (E-flag), as shown in Figure 1. [major] From a general router architecture point of view, I understand what you mean by line-card. =C2=A0But, strictly speaking from a specification point of view, what is a line-card? =C2=A0Would using "interface" instead be an acceptable generalization? [minor] Is there a difference between "prefixes that are locally attached" and a "local host prefix"? =C2=A0Are all locally-attached prefixes host prefixes (/32 or /128)? [major] "it SHOULD set the ELC for every local host prefix" =C2=A0If ELs are supported in all the interfaces, when would a router not set the ELC? =C2=A0IOW, why is "MUST" not used instead of "SHOULD"? [major/related] The last two sentences seem to be redundant -- I think that only the second one is needed; suggestion (assuming my interpretation of the questions above): =C2=A0 =C2=A0If a router supports ELs on all of its interfaces, it MUST set= the E-flag =C2=A0 =C2=A0(ELC Flag) for every local prefix it advertises. 134 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A00 1 2 3 4 5 6 7... 135 =C2=A0 =C2=A0 =C2=A0 =C2=A0 +-+-+-+-+-+-+-+-+... 136 =C2=A0 =C2=A0 =C2=A0 =C2=A0 |X|R|N|E| =C2=A0 =C2=A0 =C2=A0 =C2=A0... 137 =C2=A0 =C2=A0 =C2=A0 =C2=A0 +-+-+-+-+-+-+-+-+... 138 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Figure 1: Prefix Attr= ibute Flags 140 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 E-flag: ELC Flag (Bit= 3) 141 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Set for= local host prefix of the originating node 142 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 if it s= upports ELC. [nit] Justify the description in line with the text (move it to the left). 144 =C2=A0 When a router leaks a prefix between two levels (upwards or 145 =C2=A0 downwards), it MUST preserve the ELC signaling for this prefix. [nit] Going up is not really leaking. ;-) [minor] An Informative reference to rfc5302 would be nice. Suggestion> =C2=A0 =C2=A0When a router distributes a prefix between two levels [RFC5302= ] it MUST =C2=A0 =C2=A0preserve the E-flag setting. 147 =C2=A0 When redistributing a prefix between two IS-IS protocol instanc= es or 148 =C2=A0 redistributing from another protocol to an IS-IS protocol insta= nce, a 149 =C2=A0 router SHOULD preserve the ELC signaling for that prefix. =C2= =A0The exact 150 =C2=A0 mechanism used to exchange ELC between protocol instances runni= ng on 151 =C2=A0 an ASBR is outside of the scope of this document and is 152 =C2=A0 implementation specific. [minor] s/ELC signaling/ELC setting [nit] Please expand ASBR. [nit] s/ and is implementation specific./. 154 4. =C2=A0Acknowledgements [major] Move this section to just before the References. ... 161 5. =C2=A0Advertising ERLD Using IS-IS [major] draft-ietf-mpls-spring-entropy-label says that "To advertise an ERLD value, a SPRING router: =C2=A0MUST be entropy label capable". =C2= =A0This requirement must be translated to this document so that the ERLD is only advertised if the ELC is also advertised. =C2=A0I'm assuming that the ERLD should be ignored if the ELC is not advertised -- but that should be explicitly defined as well. =C2=A0If the ELC is advertised, but the ERLD isn't, what value should be assumed, 0? 163 =C2=A0 A new MSD-type of the Node MSD ((Maximum SID Depth) sub-TLV 164 =C2=A0 [RFC8491], called ERLD is defined to advertise the ERLD of a gi= ven 165 =C2=A0 router. =C2=A0As shown in Figure 2, it is formatted as describe= d in 166 =C2=A0 [RFC8491] with a new MSD-Type code to be assigned by IANA (the = type 167 =C2=A0 code of 2 is desired) and the Value field is set to the ERLD in= the 168 =C2=A0 range between 0 to 255. =C2=A0The scope of the advertisement de= pends on 169 =C2=A0 the application. =C2=A0If a router has multiple line-cards with= different 170 =C2=A0 capabilities of reading the maximum label stack depth, the rout= er 171 =C2=A0 MUST advertise the smallest one. [minor] "new MSD-type...called ERLD is defined to advertise the ERLD" I suggest that you call the new MSD ERLD-MSD, to differentiate ERLD from ERLD. ;-) [major] s/a new MSD-Type code to be assigned by IANA (the type code of 2 is desired)/the MSD-Type set to 2 IANA already assigned. [minor] s/Value/MSD-Value ... 180 =C2=A0 When the ERLD MSD-Type is received in the Link MSD Sub-TLV, it = MUST 181 =C2=A0 be ignored. [nit] s/When the/If the 183 6. =C2=A0Signaling ELC and ERLD in BGP-LS ... 188 =C2=A0 The ELC Flag included in the Prefix Attribute Flags sub-TLV, as 189 =C2=A0 defined in Section 3, is advertised using the Prefix Attribute = Flags 190 =C2=A0 TLV (TLV 1170) of the BGP-LS IPv4/IPv6 Prefix NLRI Attribute as 191 =C2=A0 defined in section 2.3.2 of 192 =C2=A0 [I-D.ietf-idr-bgp-ls-segment-routing-ext]. [nit] Suggestion> =C2=A0 =C2=A0The ELC is advertised using the Prefix Attribute Flags TLV as = defined in =C2=A0 =C2=A0[I-D.ietf-idr-bgp-ls-segment-routing-ext]. 194 =C2=A0 The ERLD MSD-type introduced for IS-IS in Section 5 is advertis= ed 195 =C2=A0 using the Node MSD TLV (TLV 266) of the BGP-LS Node NLRI Attrib= ute as 196 =C2=A0 defined in section 3 of [I-D.ietf-idr-bgp-ls-segment-routing-ms= d]. [nit] Suggestion> =C2=A0 =C2=A0The ERLD-MSD is advertised using the Node MSD TLV as defined i= n =C2=A0 =C2=A0[I-D.ietf-idr-bgp-ls-segment-routing-msd]. 198 7. =C2=A0IANA Considerations 200 =C2=A0 IANA is requested to allocate the E-bit (bit position 3 is desi= red) 201 =C2=A0 from the "Bit Values for Prefix Attribute Flags Sub-TLV" regist= ry. 203 =C2=A0 IANA is requested to allocate a MSD type (the type code of 2 is 204 =C2=A0 desired) from the "IGP MSD Types" registry for ERLD. [major] IANA has already assigned the values. =C2=A0Suggestion> =C2=A0 =C2=A0Early allocation has been done by IANA for this document as fo= llows: =C2=A0 =C2=A0- Bit 3 in the Bit Values for Prefix Attribute Flags Sub-TLV r= egistry has =C2=A0 =C2=A0been assigned to the ELC Flag. =C2=A0IANA is asked to update t= he registry to =C2=A0 =C2=A0reflect the name used in this document: ECL Flag (E-flag). =C2=A0 =C2=A0- Type 2 in the IGP MSD-Types registry has been assigned for t= he ERLD-MSD. =C2=A0 =C2=A0IANA is asked to update the registry to reflect the name used = in this =C2=A0 =C2=A0document: ERLD-MSD. 206 8. =C2=A0Security Considerations 208 =C2=A0 The security considerations as described in [RFC4971] nd 209 =C2=A0 [I-D.ietf-mpls-spring-entropy-label] are applicable to this doc= ument. [minor] Why? =C2=A0Also, I think that some of the other references should be added here. =C2=A0Suggestion: =C2=A0 =C2=A0This document specifies the ability to advertise additional no= de =C2=A0 =C2=A0capabilities using IS-IS and BGP-LS. =C2=A0As such, the securi= ty considerations =C2=A0 =C2=A0as described in [RFC4971], [RFC7752], [RFC7794], [RFC8491], =C2=A0 =C2=A0[I-D.ietf-idr-bgp-ls-segment-routing-ext], =C2=A0 =C2=A0[I-D.ietf-idr-bgp-ls-segment-routing-msd] and =C2=A0 =C2=A0[I-D.ietf-mpls-spring-entropy-label] are applicable to this do= cument. 211 =C2=A0 Incorrectly setting the E flag (ELC capable) (during originatio= n, 212 =C2=A0 leaking or redistribution) may lead to black-holing of the traf= fic on 213 =C2=A0 the egress node. [minor] s/E flag (ELC capable)/E flag [minor] s/during origination, leaking or redistribution/during origination or redistribution [major] "...may lead to black-holing of the traffic on the egress node." =C2=A0I'm not sure I understand how, but the ELC advertisement should be accompanied by the ERLD-MSD -- see my questions at the beginning of =C2=A75. 215 =C2=A0 Incorrectly setting of the ERLD value may lead to poor load-bal= ancing 216 =C2=A0 of the traffic. [minor] "may lead to poor load-balancing" =C2=A0If the ERLD is low, then the traffic may not be load balanced at all...that is not "poor", it is "0". ... 244 10.1. =C2=A0Normative References ... 259 =C2=A0 [I-D.ietf-mpls-spring-entropy-label] 260 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Kini, S., Kompella, K.= , Sivabalan, S., Litkowski, S., 261 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Shakir, R., and J. Tan= tsura, "Entropy label for SPRING 262 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0tunnels", draft-ietf-m= pls-spring-entropy-label-12 (work in 263 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0progress), July 2018. =3D=3D Outdated reference: draft-ietf-mpls-spring-entropy-label has been =C2=A0 =C2=A0published as RFC 8662 265 =C2=A0 [I-D.ietf-spring-segment-routing-mpls] 266 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Bashandy, A., Filsfils= , C., Previdi, S., Decraene, B., 267 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Litkowski, S., and R. = Shakir, "Segment Routing with MPLS 268 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0data plane", draft-iet= f-spring-segment-routing-mpls-22 269 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0(work in progress), Ma= y 2019. =3D=3D Outdated reference: draft-ietf-spring-segment-routing-mpls has been =C2=A0 =C2=A0published as RFC 8660 [minor] This reference can be Informative. ... 276 =C2=A0 [RFC4971] =C2=A0Vasseur, JP., Ed., Shen, N., Ed., and R. Aggarw= al, Ed., 277 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0"Intermediate System t= o Intermediate System (IS-IS) 278 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Extensions for Adverti= sing Router Information", RFC 4971, 279 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0DOI 10.17487/RFC4971, = July 2007, 280 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0. ** Obsolete normative reference: RFC 4971 ** Replace with rfc7981 ... 307 10.2. =C2=A0Informative References 309 =C2=A0 [I-D.ietf-isis-segment-routing-extensions] 310 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Previdi, S., Ginsberg,= L., Filsfils, C., Bashandy, A., 311 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Gredler, H., and B. De= craene, "IS-IS Extensions for 312 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Segment Routing", draf= t-ietf-isis-segment-routing- 313 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0extensions-25 (work in= progress), May 2019. =3D=3D Outdated reference: draft-ietf-isis-segment-routing-extensions has b= een =C2=A0 =C2=A0published as RFC 8667 From nobody Fri Feb 28 21:03:59 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 25DF33A07A7; Fri, 28 Feb 2020 21:03:57 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.097 X-Spam-Level: X-Spam-Status: No, score=-2.097 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, UNPARSEABLE_RELAY=0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id R6BKS7lhUeb2; Fri, 28 Feb 2020 21:03:54 -0800 (PST) Received: from mail-ed1-x529.google.com (mail-ed1-x529.google.com [IPv6:2a00:1450:4864:20::529]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 80B933A07A6; Fri, 28 Feb 2020 21:03:51 -0800 (PST) Received: by mail-ed1-x529.google.com with SMTP id c62so4443607edf.0; Fri, 28 Feb 2020 21:03:51 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:mime-version:date:message-id:subject:to:cc :content-transfer-encoding; bh=V4vOxHpqONVYzpAePA3/tfTTaHDgCcdmhHyn8Qhn84k=; b=CW2zdgM9CNXtIZdeprs99X23kBCcM+fpuzthPYMB1sxReE1Sl1CDs3GVN6hXcZhgSG S6SXtIUm6gBDOoZtRhK7+6a8W9qYfo9vVdUZF3o3Dmcizqpa0zP+0xU/6lvEvYc58nQe S4KKM/7HlScAfDyJ7nG6wPpj7EW4fE2W30MsLxzWpnUauu1MAIXYIosvNgxKStEMMRkj s5PZ/Q5MfV1+TwAwD2VfVT/nIwwJBoGDQMDl3ErRogtgrDWwRw0pWNhujSpLOtHjir6i ZBz3QyFTQZ1OFOAKSz1sPPvp38E6mVK35IkVy1ZpRMArrIJN43eBwA0A1h3XDHw/3Lki nEZw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:mime-version:date:message-id:subject:to:cc :content-transfer-encoding; bh=V4vOxHpqONVYzpAePA3/tfTTaHDgCcdmhHyn8Qhn84k=; b=eU06cmlr9WdTEJHqoiXtAFZtXbH3v1F/xRekgy6bI5chLLqcc6mn2j1zCh/VR6lpxa 7knPgY/dcivS1BrGo11K1YqMz6QZQ2nkkTuIfCUpnnmCfaTxyNoGqN3UOhgDzpkgJvDI R+C1SWZ1ZfzvHBhAcX4WeJb5G1ENrnbPnDJKgQ00OFfcqG0ddWyxyLaH7RrCmsNoCJN/ e7jE7tDaoDbwLBxifyMtV4385exhQ6MTrkQunkQUN2MhpT7mVHsAaWaSj4sy5ka0Cf+e 39CeoywLHbaTLtDDyVPH7MYlqW9EI/UqywjFWpsmZs/iBmzursb+aVVRVnZVyA0tDOVJ AwBw== X-Gm-Message-State: APjAAAWmuelfcmwb5mm7mG1ip6KnpPJ2LMx/dOBt2gwOAv9P4xRkK1JO hkE387hwTRn+MHeZ3x+3SW+eRpcxPXTFoFIJlT6dyaYu X-Google-Smtp-Source: APXvYqygJ0FSMu/W77dcfVS5hQB0/RL9lRjwHJ6AETUSBudx+WU6Yk1xa6E5z17ZJskzqJQwJywE05/99EQ8HZ1e5WY= X-Received: by 2002:a17:906:cf8f:: with SMTP id um15mr6773489ejb.289.1582952629263; Fri, 28 Feb 2020 21:03:49 -0800 (PST) Received: from 1058052472880 named unknown by gmailapi.google.com with HTTPREST; Fri, 28 Feb 2020 21:03:48 -0800 From: Alvaro Retana MIME-Version: 1.0 Date: Fri, 28 Feb 2020 21:03:48 -0800 Message-ID: To: "draft-ietf-ospf-mpls-elc@ietf.org" Cc: "Acee Lindem (acee)" , "lsr-chairs@ietf.org" , "lsr@ietf.org" Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Archived-At: Subject: [Lsr] AD Review of draft-ietf-ospf-mpls-elc-12 X-BeenThere: lsr@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Link State Routing Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 29 Feb 2020 05:03:57 -0000 Dear authors: This is my review of draft-ietf-ospf-mpls-elc-12. =C2=A0I reviewed this document alongside draft-ietf-isis-mpls-elc-10, so many comments are the same/similar. =C2=A0Thank you for the work in both of them! I will progress both documents together, so I will wait for both of them to address my comments before starting their IETF LC. Thanks!! Alvaro. [Line numbers from idnits.] ... 14 =C2=A0Signaling Entropy Label Capability and Entropy Readable Label-sta= ck 15 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0 =C2=A0 =C2=A0 =C2=A0Depth Using OSPF [minor] s/Label-stack/Label 16 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0draft-ietf-ospf-mpls-elc-12 18 Abstract 20 =C2=A0 Multiprotocol Label Switching (MPLS) has defined a mechanism to = load- 21 =C2=A0 balance traffic flows using Entropy Labels (EL). =C2=A0An ingres= s Label 22 =C2=A0 Switching Router (LSR) cannot insert ELs for packets going into = a 23 =C2=A0 given tunnel unless an egress LSR has indicated via signaling th= at it 24 =C2=A0 has the capability to process ELs, referred to as Entropy Label 25 =C2=A0 Capability (ELC), on that tunnel. =C2=A0In addition, it would be= useful 26 =C2=A0 for ingress LSRs to know each LSR's capability of reading the ma= ximum 27 =C2=A0 label stack depth and performing EL-based load-balancing, referr= ed to 28 =C2=A0 as Entropy Readable Label Depth (ERLD). =C2=A0This document defi= nes a 29 =C2=A0 mechanism to signal these two capabilities using OSPF and OSPFv3= . 30 =C2=A0 These mechanism is particularly useful in the environment where 31 =C2=A0 Segment Routing (SR) is used, where label advertisements are don= e via 32 =C2=A0 protocols like OSPF and OSPFv3. [nit] s/given tunnel/given Label Switched Path (LSP) [nit] s/as Entropy Label Capability/as the Entropy Label Capability [nit] s/capability of reading/capability for reading [minor] s/OSPF and OSPFv3/OSPFv2 and OSPFv3/g [minor] Add some text in the Introduction pointing at the generic use of "OSPF" to mean both OSPFv2 and OSPFv3. [minor] "protocols like OSPF..." =C2=A0That last sentence sounds as if there were other options; for example advertise labels with IS-IS and then use the extensions here. =C2=A0It's just a minor point, but I think that maybe that last sentence is not needed. ... 83 1. =C2=A0Introduction ... 96 =C2=A0 In addition, in the cases where stacked LSPs are used for whatev= er 97 =C2=A0 reasons (e.g., SR-MPLS [I-D.ietf-spring-segment-routing-mpls]), = it 98 =C2=A0 would be useful for ingress LSRs to know each intermediate LSR's 99 =C2=A0 capability of reading the maximum label stack depth and performi= ng 100 =C2=A0 EL-based load-balancing. =C2=A0This capability, referred to as = Entropy 101 =C2=A0 Readable Label Depth (ERLD) as defined in 102 =C2=A0 [I-D.ietf-mpls-spring-entropy-label] may be used by ingress LSR= s to 103 =C2=A0 determine the position of the EL label in the stack, and whethe= r it's 104 =C2=A0 necessary to insert multiple ELs at different positions in the = label 105 =C2=A0 stack. [minor] s/stacked LSPs/LSPs I'm assuming there's no special significance of "stacked" in this case, as this is the only place in the document that it is used. [nit] s/in the cases where LSPs are used for whatever reasons/in cases where LSPs are used 107 2. =C2=A0Terminology 109 =C2=A0 This document makes use of the terms defined in [RFC6790], [RFC= 7770] 110 =C2=A0 and [I-D.ietf-mpls-spring-entropy-label]. [minor] I'm not sure why rfc7770 is referenced here; what terminology is needed from it? 112 =C2=A0 The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL N= OT", 113 =C2=A0 "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY"= , and 114 =C2=A0 "OPTIONAL" in this document are to be interpreted as described = in 115 =C2=A0 [BCP14] [RFC2119] [RFC8174] when, and only when, they appear in= all 116 =C2=A0 capitals, as shown here. [major] s/[BCP14]/BCP 14 118 3. =C2=A0Advertising ELC Using OSPF 120 =C2=A0 Even though ELC is a property of the node, in some cases it is 121 =C2=A0 advantageous to associate and advertise the ELC with the prefix= . =C2=A0In 122 =C2=A0 multi-area networks, routers may not know the identity of the p= refix 123 =C2=A0 originator in a remote area, or may not know the capabilities o= f such 124 =C2=A0 originator. =C2=A0Similarly, in a multi domain network, the ide= ntity of 125 =C2=A0 the prefix originator and its capabilities may not be known to = the 126 =C2=A0 ingress LSR. [nit] s/with the prefix/with a prefix [minor] Is there a difference that are you trying to highlight between multi-area and multi-domain? =C2=A0The last two sentences seem redundant to me; using "domain" should be enough. 128 =C2=A0 If a router has multiple line cards, the router MUST NOT announ= ce ELC 129 =C2=A0 unless all of its line-cards are capable of processing ELs. 131 =C2=A0 If the router supports ELs on all of its line cards, it SHOULD 132 =C2=A0 advertise the ELC with every local host prefix it advertises in= OSPF. [major] From a general router architecture point of view, I understand what you mean by line-card. =C2=A0But, strictly speaking from a specification point of view, what is a line-card? =C2=A0Would using "interface" instead be an acceptable generalization? [major] "it SHOULD advertise the ELC for every local host prefix" =C2=A0If ELs are supported in all the interfaces, when would a router not set the ELC? =C2=A0IOW, why is "MUST" not used instead of "SHOULD"? [major/related] The two paragraphs seem to be redundant -- I think that only the second one is needed; suggestion (assuming my interpretation of the questions above): =C2=A0 =C2=A0If a router supports ELs on all of its interfaces, it MUST set= the E-flag =C2=A0 =C2=A0(ELC Flag) for every attached prefix it advertises. 134 =C2=A0 When an OSPF Area Border Router (ABR) advertises the prefix to = the 135 =C2=A0 connected area based on the intra-area or inter-area prefix tha= t is 136 =C2=A0 reachable in some other area, it MUST preserve the ELC signalli= ng for 137 =C2=A0 such prefix. [] Suggestion> =C2=A0 =C2=A0When an OSPF Area Border Router (ABR) distributes information = between =C2=A0 =C2=A0connected areas it MUST preserve the ELC setting. 139 =C2=A0 When an OSPF Autonomous System Boundary Router (ASBR) redistrib= utes 140 =C2=A0 the prefix from another instance of the OSPF or from some other 141 =C2=A0 protocol, it SHOULD preserve the ELC signaling for the prefix. = =C2=A0The 142 =C2=A0 exact mechanism used to exchange ELC between protocol instances= on 143 =C2=A0 the ASBR is outside of the scope of this document and is 144 =C2=A0 implementation specific. [nit] s/redistributes the prefix/redistributes a prefix [minor] s/ELC signaling/ELC setting [nit] s/ and is implementation specific./. ... 156 3.2. =C2=A0Advertising ELC Using OSPFv3 158 =C2=A0 [RFC5340] defines the OSPFv3 PrefixOptions that are advertised = along 159 =C2=A0 with the prefix. =C2=A0A new bit in the OSPFV3 PrefixOptions is= used to 160 =C2=A0 signal the ELC for the prefix: [minor] s/[RFC5340] defines the OSPFv3 PrefixOptions that are advertised along with the prefix./[RFC5340] defines the OSPFv3 PrefixOptions field to indicate capabilities associated with a prefix. [nit] s/OSPFV3 PrefixOptions/OSPFv3 PrefixOptions field ... 165 4. =C2=A0Advertising ERLD Using OSPF [major] draft-ietf-mpls-spring-entropy-label says that "To advertise an ERLD value, a SPRING router: =C2=A0MUST be entropy label capable". =C2= =A0This requirement must be translated to this document so that the ERLD is only advertised if the ELC is also advertised. =C2=A0I'm assuming that the ERLD should be ignored if the ELC is not advertised -- but that should be explicitly defined as well. =C2=A0If the ELC is advertised, but the ERLD isn't, what value should be assumed, 0? 167 =C2=A0 A new MSD (Maximum SID Depth) type of the Node MSD sub-TLV [RFC= 8476], 168 =C2=A0 called ERLD is defined to advertise the ERLD of a given router.= =C2=A0The 169 =C2=A0 scope of the advertisement depends on the application. 171 =C2=A0 Assignment of a MSD-Type for ERLD is defined in 172 =C2=A0 [I-D.ietf-isis-mpls-elc]. [minor] Instead of the last two paragraphs: =C2=A0 =C2=A0The ERLD is advertised in a Node MSD sub-TLV [RFC8476] using t= he ERLD-MSD =C2=A0 =C2=A0type defined in [I-D.ietf-isis-mpls-elc]. ... 181 5. =C2=A0Signaling ELC and ERLD in BGP-LS ... 186 =C2=A0 The ELC Flag included in the OSPFv2 Extended Prefix TLV and the 187 =C2=A0 OSPFv3 PrefixOptions, as defined in Section 3, is advertised us= ing 188 =C2=A0 the Prefix Attribute Flags TLV (TLV 1170) of the BGP-LS IPv4/IP= v6 189 =C2=A0 Prefix NLRI Attribute as defined in section 2.3.2 of 190 =C2=A0 [I-D.ietf-idr-bgp-ls-segment-routing-ext]. [nit] Suggestion> =C2=A0 =C2=A0The ELC is advertised using the Prefix Attribute Flags TLV as = defined in =C2=A0 =C2=A0[I-D.ietf-idr-bgp-ls-segment-routing-ext]. 192 =C2=A0 The ERLD MSD-type introduced for OSPF in Section 4 is advertise= d 193 =C2=A0 using the Node MSD TLV (TLV 266) of the BGP-LS Node NLRI Attrib= ute as 194 =C2=A0 defined in section 3 of [I-D.ietf-idr-bgp-ls-segment-routing-ms= d]. [nit] Suggestion> =C2=A0 =C2=A0The ERLD-MSD is advertised using the Node MSD TLV as defined i= n =C2=A0 =C2=A0[I-D.ietf-idr-bgp-ls-segment-routing-msd]. 196 6. =C2=A0Acknowledgements [major] Move this section to just before the References. ... 202 7. =C2=A0IANA Considerations 204 =C2=A0 This document requests IANA to allocate one flag from the OSPFv= 2 205 =C2=A0 Extended Prefix TLV Flags registry: 207 =C2=A0 =C2=A0 =C2=A00x20 - E-Flag (ELC Flag) 209 =C2=A0 This document requests IANA to allocate one flag from the OSPFv= 3 210 =C2=A0 Prefix Options registry: 212 =C2=A0 =C2=A0 =C2=A00x04 - E-Flag (ELC Flag) [major] IANA has already assigned the values. =C2=A0Suggestion> =C2=A0 =C2=A0Early allocation has been done by IANA for this document as fo= llows: =C2=A0 =C2=A0- Flag 0x20 in the OSPFv2 Extended Prefix TLV Flags registry h= as been =C2=A0 =C2=A0assigned to the E-Flag (ELC Flag). =C2=A0IANA is asked to upda= te the registry to =C2=A0 =C2=A0reflect the name used in this document: E-Flag (ELC Flag). =C2=A0 =C2=A0- Bit 0x04 in the "OSPFv3 Prefix Options (8 bits)" registry ha= s been =C2=A0 =C2=A0assigned to the E-Flag (ELC Flag). =C2=A0IANA is asked to upda= te the registry to =C2=A0 =C2=A0reflect the name used in this document: E-Flag (ELC Flag). 214 8. =C2=A0Security Considerations 216 =C2=A0 The security considerations as described in [RFC7770] and 217 =C2=A0 [I-D.ietf-mpls-spring-entropy-label] are applicable to this doc= ument. [minor] Why? =C2=A0Also, I think that some of the other references should be added here. =C2=A0Suggestion: =C2=A0 =C2=A0This document specifies the ability to advertise additional no= de =C2=A0 =C2=A0capabilities using IS-IS and BGP-LS. =C2=A0As such, the securi= ty considerations =C2=A0 =C2=A0as described in [RFC5340], [RFC7770], [RFC7752], [RFC7684], [R= FC8476], =C2=A0 =C2=A0[I-D.ietf-idr-bgp-ls-segment-routing-ext], =C2=A0 =C2=A0[I-D.ietf-idr-bgp-ls-segment-routing-msd] and =C2=A0 =C2=A0[I-D.ietf-mpls-spring-entropy-label] are applicable to this do= cument. 219 =C2=A0 Incorrectly setting the E flag (ELC capable) (during originatio= n, 220 =C2=A0 inter-area advertisement or redistribution) may lead to black-h= oling 221 =C2=A0 of the traffic on the egress node. [minor] s/E flag (ELC capable)/E flag [major] "...may lead to black-holing of the traffic on the egress node." =C2=A0I'm not sure I understand how, but the ELC advertisement should be accompanied by the ERLD-MSD -- see my questions at the beginning of =C2=A74. 223 =C2=A0 Incorrectly setting of the ERLD value may lead to poor load-bal= ancing 224 =C2=A0 of the traffic. [minor] "may lead to poor load-balancing" =C2=A0If the ERLD is low, then the traffic may not be load balanced at all...that is not "poor", it is "0". ... 252 10.1. =C2=A0Normative References 254 =C2=A0 [BCP14] =C2=A0 =C2=A0, . [major] A reference to BCP14 is not needed. =C2=A0The ones to [RFC2119] and [RFC8174] are enough. ... 275 =C2=A0 [I-D.ietf-mpls-spring-entropy-label] 276 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Kini, S., Kompella, K.= , Sivabalan, S., Litkowski, S., 277 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Shakir, R., and J. Tan= tsura, "Entropy label for SPRING 278 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0tunnels", draft-ietf-m= pls-spring-entropy-label-12 (work in 279 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0progress), July 2018. =3D=3D Outdated reference: draft-ietf-mpls-spring-entropy-label has been =C2=A0 =C2=A0published as RFC 8662 281 =C2=A0 [I-D.ietf-spring-segment-routing-mpls] 282 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Bashandy, A., Filsfils= , C., Previdi, S., Decraene, B., 283 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Litkowski, S., and R. = Shakir, "Segment Routing with MPLS 284 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0data plane", draft-iet= f-spring-segment-routing-mpls-22 285 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0(work in progress), Ma= y 2019. =3D=3D Outdated reference: draft-ietf-spring-segment-routing-mpls has been =C2=A0 =C2=A0published as RFC 8660 [minor] This reference can be Informative. ... 326 10.2. =C2=A0Informative References 328 =C2=A0 [I-D.ietf-ospf-segment-routing-extensions] 329 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Psenak, P., Previdi, S= ., Filsfils, C., Gredler, H., 330 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Shakir, R., Henderickx= , W., and J. Tantsura, "OSPF 331 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Extensions for Segment= Routing", draft-ietf-ospf-segment- 332 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0routing-extensions-27 = (work in progress), December 2018. =3D=3D Outdated reference: draft-ietf-ospf-segment-routing-extensions has b= een =C2=A0 =C2=A0published as RFC 8665 From nobody Fri Feb 28 22:42:25 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 6A2193A0971 for ; Fri, 28 Feb 2020 22:42:23 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.898 X-Spam-Level: X-Spam-Status: No, score=-1.898 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, UNPARSEABLE_RELAY=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]) 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15.20.2772.018; Sat, 29 Feb 2020 20:53:37 +0000 From: "Acee Lindem (acee)" To: Alvaro Retana , "draft-ietf-isis-mpls-elc@ietf.org" CC: "lsr-chairs@ietf.org" , "lsr@ietf.org" Thread-Topic: AD Review of draft-ietf-isis-mpls-elc-10 Thread-Index: AQHV7r06T6BhkMr+fU+/YzWEzoNHEagyU1GA Date: Sat, 29 Feb 2020 20:53:36 +0000 Message-ID: References: In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: user-agent: Microsoft-MacOutlook/10.22.0.200209 authentication-results: spf=none (sender IP is ) smtp.mailfrom=acee@cisco.com; x-originating-ip: [2001:420:c0c4:1007::3c] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: be4b5c5b-902a-42bc-b1b8-08d7bd5972bc x-ms-traffictypediagnostic: BN8PR11MB3602: x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:8882; x-forefront-prvs: 03283976A6 x-forefront-antispam-report: SFV:NSPM; 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