From nobody Sun Mar 1 05:00:01 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 4F5C13A0E90 for ; Sun, 1 Mar 2020 04:59:58 -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, HTML_MESSAGE=0.001, SPF_PASS=-0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id IkMNcarF7x9l for ; Sun, 1 Mar 2020 04:59:55 -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 06F1D3A094F for ; Sun, 1 Mar 2020 04:59:55 -0800 (PST) Received: from lhreml702-cah.china.huawei.com (unknown [172.18.7.107]) by Forcepoint Email with ESMTP id D175B96CBDFD96324B67 for ; Sun, 1 Mar 2020 12:59:51 +0000 (GMT) Received: from DGGEML402-HUB.china.huawei.com (10.3.17.38) by lhreml702-cah.china.huawei.com (10.201.108.43) with Microsoft SMTP Server (TLS) id 14.3.408.0; Sun, 1 Mar 2020 12:59:51 +0000 Received: from DGGEML524-MBX.china.huawei.com ([169.254.1.105]) by DGGEML402-HUB.china.huawei.com ([fe80::fca6:7568:4ee3:c776%31]) with mapi id 14.03.0439.000; Sun, 1 Mar 2020 20:59:48 +0800 From: wangyali To: "lsr@ietf.org" Thread-Topic: Overview of two new drafts about IFIT node capability advertisement in ISIS and OSPF Thread-Index: AdXvyTBRkXWM/5XkT0qPNc3dgpAoMw== Date: Sun, 1 Mar 2020 12:59:47 +0000 Message-ID: <1520992FC97B944A9979C2FC1D7DB0F404DA66CE@dggeml524-mbx.china.huawei.com> Accept-Language: en-US Content-Language: zh-CN X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.66.66.87] Content-Type: multipart/alternative; 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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 TENyIi9PIyZp for ; Mon, 2 Mar 2020 01:14:52 -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 CADC53A1080 for ; Mon, 2 Mar 2020 01:14:51 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=1568; q=dns/txt; s=iport; t=1583140492; x=1584350092; h=subject:to:cc:references:from:message-id:date: mime-version:in-reply-to:content-transfer-encoding; bh=gjc1txruGuxPBW+LSU7nfkyqSTV1jNNxD6BP8BCu71Q=; b=DkQQ/GUzZqj0/lhFbZErk8b5o+KOBq72JQUCTD1gfHykwVOWj7zyCLvV QVGR++FRnri/gzaQKg93bYMHS8dqcM+DNMt2xF+pZC3LyMjcF2pOMYzh3 S+o1QfeJjlnl3kWfro9GAR5g3rFBtAfoKio/sYTXvnBWTaWaNpLqx9wxr s=; X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: =?us-ascii?q?A0C+BQCkzVxe/xbLJq1mHgELHIVlIBI?= =?us-ascii?q?qhBSJA4gMmz4JAQEBDi8EAQGEQAKCLzgTAgMNAQEFAQEBAgEFBG2FYoVkAQU?= =?us-ascii?q?jDwEFQRALGAICJgICVxMGAgEBgyKCfKoKdYEyhUqDL4E+gQ4qjD+BQT+BESe?= =?us-ascii?q?CbT6FGIJEgl4EsBuCRoJRlA8GHIJJiB+EJowjqmSBaSKBWDMaCBsVgydQGA2?= =?us-ascii?q?cZkADMJFWAQE?= X-IronPort-AV: E=Sophos;i="5.70,506,1574121600"; d="scan'208";a="23934454" Received: from aer-iport-nat.cisco.com (HELO aer-core-1.cisco.com) ([173.38.203.22]) by aer-iport-1.cisco.com with ESMTP/TLS/DHE-RSA-SEED-SHA; 02 Mar 2020 09:14:48 +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 0229El7j023759; Mon, 2 Mar 2020 09:14:47 GMT To: peng.shaofu@zte.com.cn Cc: lsr@ietf.org References: <202002291441590769964@zte.com.cn> From: Peter Psenak Message-ID: <73ac0765-359f-2ea7-f29d-c64ce95bb33b@cisco.com> Date: Mon, 2 Mar 2020 10:14:47 +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: <202002291441590769964@zte.com.cn> 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] Questions about draft-ietf-lsr-flex-algo-06 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, 02 Mar 2020 09:14:54 -0000 Hi Peng, On 29/02/2020 07:41, peng.shaofu@zte.com.cn wrote: > > Hi Peter > > > Please see the difference rules of TE metric in Flex-algo draft and RFC5305. > > For  the link without TE metric attribute, in Flex-algo draft it will be > excluded from FA plane that configured TE metric type, but in RFC5305 > the IGP metric of the link can be as replacement. > > Please see if they can be consistent ? no, we do not want to fallback from one metric to other in case of flex-algo. RFC5305 is irrelevant in this case, as flex-algo is a completely different application. thanks, Peter > > > Flex-algo draft: > > section 12.  Calculation of Flexible Algorithm Paths > > Rule-5: > >  5.  If the Flex-Algorithm definition uses other than IGP metric > >       (Section 5), and such metric is not advertised for the particular > >       link in a topology for which the computation is done, such link > >       MUST be pruned from the computation.  A metric of value 0 MUST NOT > >       be assumed in such case. > > > > RFC5305: > > section 3.7.  Sub-TLV 18: Traffic Engineering Default Metric > > This sub-TLV is optional.  This sub-TLV SHOULD appear once at most in > >    each extended IS reachability TLV.  If a link is advertised without > >    this sub-TLV, traffic engineering SPF calculations MUST use the > >    normal default metric of this link, which is advertised in the fixed > >    part of the extended IS reachability TLV. > > > > From nobody Mon Mar 2 01:34:34 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 001643A10D3; Mon, 2 Mar 2020 01:34:32 -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 ucT-lwTToMbM; Mon, 2 Mar 2020 01:34:31 -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 DBB103A10D6; Mon, 2 Mar 2020 01:34:30 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=569; q=dns/txt; s=iport; t=1583141671; x=1584351271; h=subject:to:references:from:message-id:date:mime-version: in-reply-to:content-transfer-encoding; bh=DjBiBeHutA9knudcTxSZ8QxIHAbKnQ2XfjQcvWyQra8=; b=mkQDopJvwhhyMHTauJaJ7V+NoNXtQzDTQYnoxF+/bUB47cVcZcOzt3bc cuLAQo6KFP632lEsMVoVlsARVWzwoH5Ces0ULCEUtiePjGMYp+t+f0kYK eGoSYNrsmBMbQg3mZVluu1vjjGEURYElXhY6O/cibxYmIlf/CRmAu1RpK s=; X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: =?us-ascii?q?A0BOAwB40lxe/xbLJq1mHAEBAQEBBwE?= =?us-ascii?q?BEQEEBAEBgXuDaiASKoQUiQOIC5s+CQEBAQ4vBAEBhEACgi84EwIDAQELAQE?= =?us-ascii?q?FAQEBAgEFBG2FYoVkAQUjDwEFUQsYAgIjAwICRhEGAQwGAgEBgyKCfKl9dYE?= =?us-ascii?q?yhUqDL4E+gQ4qjD+BQT+BOII/Lj6BBAGGV4JeBI4ZiFyZJoJGglGUDwYcgjk?= =?us-ascii?q?QiB+EJowjjnKBTZolgWkigVgzGggbFYMnUBgNjjWOMUADMJFWAQE?= X-IronPort-AV: E=Sophos;i="5.70,506,1574121600"; d="scan'208";a="23873392" Received: from aer-iport-nat.cisco.com (HELO aer-core-2.cisco.com) ([173.38.203.22]) by aer-iport-4.cisco.com with ESMTP/TLS/DHE-RSA-SEED-SHA; 02 Mar 2020 09:34:27 +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 0229YQAE005437; Mon, 2 Mar 2020 09:34:26 GMT To: Yingzhen Qu , lsr@ietf.org, lsr-chairs@ietf.org References: From: Peter Psenak Message-ID: Date: Mon, 2 Mar 2020 10:34:26 +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] IETF 107 LSR Presentation Slot Requests 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, 02 Mar 2020 09:34:33 -0000 Hi Yingzhen, I would like to give a 10 mins update on ietf-lsr-flex-algo. thanks, Peter On 28/02/2020 20:56, Yingzhen Qu wrote: > 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 From nobody Mon Mar 2 02:52:11 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 738CB3A0809 for ; Mon, 2 Mar 2020 02:52:09 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.897 X-Spam-Level: X-Spam-Status: No, score=-1.897 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, UNPARSEABLE_RELAY=0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no 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 MYfDlGUE_0oR 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c3A7Zml4ZWQ8YnI+Jmd0OyZuYnNwOzxicj4mZ3Q7Jm5ic3A7Jm5ic3A7Jm5ic3A7Jm5ic3A7Jm5i c3A7cGFydCZuYnNwO29mJm5ic3A7dGhlJm5ic3A7ZXh0ZW5kZWQmbmJzcDtJUyZuYnNwO3JlYWNo YWJpbGl0eSZuYnNwO1RMVi48YnI+Jmd0OyZuYnNwOzxicj4mZ3Q7Jm5ic3A7PGJyPiZndDsmbmJz cDs8YnI+Jmd0OyZuYnNwOzxicj48L2Rpdj48L2Rpdj48L2Rpdj48L2Rpdj48L2Rpdj48L2Rpdj48 cD48YnI+PC9wPjwvZGl2Pg== --=====_003_next=====-- --=====_002_next=====-- --=====_001_next=====-- From nobody Mon Mar 2 06:17:05 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 90B7F3A041E; Mon, 2 Mar 2020 06:16:56 -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, 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 8ivpcT__2xvC; Mon, 2 Mar 2020 06:16:53 -0800 (PST) Received: from m176115.mail.qiye.163.com (m176115.mail.qiye.163.com [59.111.176.115]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id CA0843A073E; Mon, 2 Mar 2020 06:16:52 -0800 (PST) Received: from WangajPC (unknown [101.242.202.101]) by m176115.mail.qiye.163.com (Hmail) with ESMTPA id BE81E6646A8; Mon, 2 Mar 2020 22:16:28 +0800 (CST) From: "Aijun Wang" To: "'Yingzhen Qu'" , , References: In-Reply-To: Date: Mon, 2 Mar 2020 22:16:28 +0800 Message-ID: <004a01d5f09d$2acf0640$806d12c0$@org.cn> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_004B_01D5F0E0.38F24640" X-Mailer: Microsoft Office Outlook 12.0 Thread-Index: AdXucUvvSRMlkvz9Te25ZjsSzhxIRACKmaew Content-Language: zh-cn X-HM-Spam-Status: e1kfGhgUHx5ZQUtXWQgYFAkeWUFZVktVT0pLQkJCQk5ITE9NTEJNWVdZKF lBSkxLS0o3V1ktWUFJV1kJDhceCFlBWTU0KTY6NyQpLjc#WQY+ X-HM-Sender-Digest: e1kMHhlZQR0aFwgeV1kSHx4VD1lBWUc6PxQ6PBw*Fjg9SEISTEgCNk9O KCxPCzFVSlVKTkNISk5DTkJJSk5KVTMWGhIXVQwaFRwaEhEOFTsPCBIVHBMOGlUUCRxVGBVFWVdZ EgtZQVlKS0pVSU9JVUlLSVVKS0pZV1kIAVlBSktCSkw3Bg++ X-HM-Tid: 0a709b9af5f69373kuwsbe81e6646a8 Archived-At: Subject: [Lsr] =?utf-8?b?562U5aSNOiAgSUVURiAxMDcgTFNSIFByZXNlbnRhdGlvbiBT?= =?utf-8?q?lot_Requests?= 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, 02 Mar 2020 14:17:04 -0000 This is a multi-part message in MIME format. ------=_NextPart_000_004B_01D5F0E0.38F24640 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable HI, Yingzhen: =20 We would like to apply 10 minutes to make a presentation about the draft = https://tools.ietf.org/html/draft-wang-lsr-passive-interface-attribute-00= The information about the presentation are the followings: =20 Title: Passive Interface Attribute Presenter: Huaimo Chen/Aijun Wang Duration: 10 minutes Draft: = https://tools.ietf.org/html/draft-wang-lsr-passive-interface-attribute-00= =20 =20 Best Regards. =20 Aijun Wang China Telecom =20 =E5=8F=91=E4=BB=B6=E4=BA=BA: lsr-bounces@ietf.org = [mailto:lsr-bounces@ietf.org] =E4=BB=A3=E8=A1=A8 Yingzhen Qu =E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2020=E5=B9=B42=E6=9C=8829=E6=97=A5 = 3:57 =E6=94=B6=E4=BB=B6=E4=BA=BA: lsr@ietf.org; lsr-chairs@ietf.org =E4=B8=BB=E9=A2=98: [Lsr] IETF 107 LSR Presentation Slot Requests =20 Hi all, =20 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).=20 =20 If you plan to present remotely, please let us know so we can make the = arrangements with the Meetecho team. =20 Thanks, Yingzhen ------=_NextPart_000_004B_01D5F0E0.38F24640 Content-Type: text/html; charset="utf-8" Content-Transfer-Encoding: quoted-printable

HI, Yingzhen:

 

We would like to apply 10 minutes to make a presentation about the = draft https://tools.ietf.org/html/draft-wang-lsr-passive-interface-at= tribute-00

The information about the presentation are the = followings:

 

Title: = =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0Passive Interface Attribute

Presenter: =C2=A0=C2=A0=C2=A0=C2=A0Huaimo Chen/Aijun = Wang

Duration:=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 10 = minutes

Draft:=C2=A0=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://tools.ietf.org/html/draft-wang-lsr-passive-interface-at= tribute-00

 

 

Best Regards.

 

Aijun Wang

China Telecom

 

=E5=8F=91=E4=BB=B6=E4=BA=BA: lsr-bounces@ietf.org = [mailto:lsr-bounces@ietf.org] =E4=BB=A3=E8=A1=A8 Yingzhen Qu
=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2020=E5=B9=B42=E6=9C=8829=E6=97=A5 3:57
=E6=94=B6=E4=BB=B6=E4=BA=BA: lsr@ietf.org; = lsr-chairs@ietf.org
=E4=B8=BB=E9=A2=98: [Lsr] IETF 107 LSR = Presentation Slot Requests

 

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 indicati= ng 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

------=_NextPart_000_004B_01D5F0E0.38F24640-- From nobody Mon Mar 2 10:12:33 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 14DB03A0E4D; Mon, 2 Mar 2020 10:12:22 -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 z-Jy7lQaOa5d; Mon, 2 Mar 2020 10:12:19 -0800 (PST) Received: from mail-qt1-x82f.google.com (mail-qt1-x82f.google.com [IPv6:2607:f8b0:4864:20::82f]) (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 22DA13A0E3E; Mon, 2 Mar 2020 10:12:19 -0800 (PST) Received: by mail-qt1-x82f.google.com with SMTP id r6so656153qtt.9; Mon, 02 Mar 2020 10:12:19 -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=CepfS0UX28jaPHCSGHddP8yO3OhCY6bcJKF13DPK9Pg=; b=AuP/4hxI2qzK+gXFUnjJNqzI75yA248E+04a1BGjulI0cTVpU+GZtYrTrv0wXbpAeM TdZKXZ0g9piZKCrf6PmkYAvuKQg3Y0Dwsoy4fIimw5BApoxkk6Z3zR2JGuy/IG2uRSxs ORRq0Hb98vlJsI5r0ZV1Ef9jpt0BKIMc1Uhph4fjGEDgV/4Ob6y43F6w9P3/u6pOEoZ2 5xNeGIJv60RvilpVIC4EzRyxfmDMSpnzzqwAe+SnTEi7F9Jk4jd6m3bcIpspQh0jFx3Z ouJPNA1DLGN/np8CPj3gvsSQ7+49Sdq2Bvu+FEN+VDoR3TwWPNeRcDeOlQ+lPBEA6w76 ytXQ== 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=CepfS0UX28jaPHCSGHddP8yO3OhCY6bcJKF13DPK9Pg=; b=qHW+NA/S6T2ceKnopQtTSiKxwclcMOv1Xgrl2JfNrjD/7u28eecxV8nsx8U0nO0rYY tlF2wshGyITg1bI3v4IgxptnPfTaSm70JUiko0Tn0Q71FvuNbbh8pdNI8o8J4IkkCgs6 bDnxQx339rXsJpKbIjrc3QFV5MDt02+coHWBFVrZH45OD9wTZpou9DPFPVlJ+ZH6Gt0V HyR22Olz3A6HgtIerjD84Cb4zLxf96hk/OTx0UQ02SrVzNMOeFuP2D2co0rjkoy0dyY+ wQLSnE1NhYyTVqQ9YfYiESsADWRWmisXGHB4PxT21C5v/iItMinZ5GLbzf/Ns5LsjaRQ HD1Q== X-Gm-Message-State: ANhLgQ0bfKIdXJob8FXyAT7s8sabQaOcVU67T78dacnD3TOGSxAAWQNr q7GE22L1iCgeN2HbkL2JOf3U1jd06ly0hzEyuPE= X-Google-Smtp-Source: ADFU+vs9qWJKhPZM8/oKAtD2M/VQEamcvp1o4aUqid/kQqvPAJ8c/wduzKuuySVMznJXbLK7y+KO2ZN6I2TXA9GBFGY= X-Received: by 2002:ac8:7952:: with SMTP id r18mr928767qtt.29.1583172738107; Mon, 02 Mar 2020 10:12:18 -0800 (PST) MIME-Version: 1.0 References: <12659_1582880639_5E58D77F_12659_66_1_53C29892C857584299CBF5D05346208A48DCA80D@OPEXCAUBM43.corporate.adroot.infra.ftgroup> <7453_1582899837_5E59227C_7453_80_1_53C29892C857584299CBF5D05346208A48DD14BA@OPEXCAUBM43.corporate.adroot.infra.ftgroup> In-Reply-To: <7453_1582899837_5E59227C_7453_80_1_53C29892C857584299CBF5D05346208A48DD14BA@OPEXCAUBM43.corporate.adroot.infra.ftgroup> From: Chris Bowers Date: Mon, 2 Mar 2020 12:09:29 -0600 Message-ID: To: "Ketan Talaulikar (ketant)" Cc: "Ketan Talaulikar (ketant)" , "lsr@ietf.org" , SPRING WG List , draft-ietf-spring-srv6-network-programming , "Peter Psenak (ppsenak)" , Bruno Decraene Content-Type: multipart/alternative; boundary="000000000000ac4d17059fe3203d" 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: Mon, 02 Mar 2020 18:12:22 -0000 --000000000000ac4d17059fe3203d Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Ketan, Based on current documents, allocating all SRv6 locators used in a domain from a single block is optional. However, assuming for the moment that a network operator has chosen to allocate all SRv6 locators used in a domain from a single block, so that there is a well-defined value of B and N across a domain, what is the use of having a router advertise its own understanding of these two values? And what is a receiver supposed to do with this information? Thanks, Chris On Fri, Feb 28, 2020 at 8:23 AM wrote: > Hi Ketan, > > > > Thanks fort the follow up. > > Clarification inline [Bruno] > > > > *From**:* Ketan Talaulikar (ketant) [mailto:ketant@cisco.com] > *Sent:* Friday, February 28, 2020 11:11 AM > *To:* DECRAENE Bruno TGI/OLN; Ketan Talaulikar (ketant); Chris Bowers > *Cc:* lsr@ietf.org; SPRING WG List; > draft-ietf-spring-srv6-network-programming; Peter Psenak (ppsenak) > *Subject:* RE: [Lsr] clarification of locator block and locator node in > draft-ietf-spring-srv6-network-programming and > draft-ietf-lsr-isis-srv6-extensions > > > > Hi Bruno, > > > > I believe the description and usage of Locator is very well described and > covered in the net-pgm draft as also the corresponding IGP extensions. Is > the question is more about the =E2=80=9Cblock=E2=80=9D part of it (what i= s not in the block > part is in the node part as per the text in the net-pgm draft)? > > > > The =E2=80=9Cblock=E2=80=9D is again not a new thing. Please check the fo= llowing: > > Under > https://tools.ietf.org/html/draft-ietf-6man-segment-routing-header-26#sec= tion-5 > =E2=80=A6 look for =E2=80=9Cblock=E2=80=9D > > https://tools.ietf.org/html/rfc8402#section-2 =E2=80=A6 look under SRGB f= or SRv6 > > > > [Bruno] > > To clarify, my question was not specific to =E2=80=9Cblock=E2=80=9D but r= elated to the > usage, by the receiver, of the following piece of information: > > > > LB Length: SRv6 SID Locator Block length > > LN Length: SRv6 SID Locator Node length > > Fun. Length: SRv6 SID Function length > > Arg. Length: SRv6 SID Arguments length > > > > > > So perhaps I don=E2=80=99t get Chris=E2=80=99s point and would wait for h= im to clarify. > > [Bruno] I=E2=80=99ll leave this to Chris. > > > > Thanks, > > Ketan > > > > *From:* Lsr *On Behalf Of * > bruno.decraene@orange.com > *Sent:* 28 February 2020 14:34 > *To:* Ketan Talaulikar (ketant) ; > Chris Bowers > *Cc:* lsr@ietf.org; SPRING WG List ; > draft-ietf-spring-srv6-network-programming < > draft-ietf-spring-srv6-network-programming@ietf.org>; Peter Psenak > (ppsenak) > *Subject:* Re: [Lsr] clarification of locator block and locator node in > draft-ietf-spring-srv6-network-programming and > draft-ietf-lsr-isis-srv6-extensions > > > > Hi Ketan, > > > > > > > > *From:* Lsr [mailto:lsr-bounces@ietf.org ] *On > Behalf Of *Ketan Talaulikar (ketant) > *Sent:* Friday, February 28, 2020 6:30 AM > > > > Hi Chris, > > > > I agree with Peter and I would suggest to drop LSR since this is not a > protocol specific thing. > > > > I believe the text in draft-ietf-spring-srv6-network-programming clears > says what locator block and locator node are. What more details do you > think are required? > > > > [Bruno] Speaking as an individual, the draft could possibly clarify the > usage of these information/fields by the receiver. Possibly using the sam= e > name/term (e.g. SRv6 SID Locator Block length) to ease the references > between both drafts. > > > > Thanks, > > --Bruno > > > > Thanks, > > Ketan > > > > *From:* Lsr *On Behalf Of *Chris Bowers > *Sent:* 27 February 2020 22:46 > *To:* lsr@ietf.org; SPRING WG List > *Cc:* Peter Psenak (ppsenak) > *Subject:* [Lsr] clarification of locator block and locator node in > draft-ietf-spring-srv6-network-programming and > draft-ietf-lsr-isis-srv6-extensions > > > > SPRING and LSR WGs, > > > > I think that we need a much more detailed description of the locator bloc= k > 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 > > > > _________________________________________________________________________= ________________________________________________ > > > > Ce message et ses pieces jointes peuvent contenir des informations confid= entielles ou privilegiees et ne doivent donc > > pas etre diffuses, exploites ou copies sans autorisation. Si vous avez re= cu ce message par erreur, veuillez le signaler > > a l'expediteur et le detruire ainsi que les pieces jointes. Les messages = electroniques etant susceptibles d'alteration, > > Orange decline toute responsabilite si ce message a ete altere, deforme o= u falsifie. Merci. > > > > This message and its attachments may contain confidential or privileged i= nformation that may be protected by law; > > they should not be distributed, used or copied without authorisation. > > If you have received this email in error, please notify the sender and de= lete this message and its attachments. > > As emails may be altered, Orange is not liable for messages that have bee= n modified, changed or falsified. > > Thank you. > > _________________________________________________________________________= ________________________________________________ > > Ce message et ses pieces jointes peuvent contenir des informations confid= entielles ou privilegiees et ne doivent donc > pas etre diffuses, exploites ou copies sans autorisation. Si vous avez re= cu ce message par erreur, veuillez le signaler > a l'expediteur et le detruire ainsi que les pieces jointes. Les messages = electroniques etant susceptibles d'alteration, > Orange decline toute responsabilite si ce message a ete altere, deforme o= u falsifie. Merci. > > This message and its attachments may contain confidential or privileged i= nformation that may be protected by law; > they should not be distributed, used or copied without authorisation. > If you have received this email in error, please notify the sender and de= lete this message and its attachments. > As emails may be altered, Orange is not liable for messages that have bee= n modified, changed or falsified. > Thank you. > > --000000000000ac4d17059fe3203d Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Ketan,

Based on current docu= ments, allocating all SRv6 locators used in a domain from a single block is= optional.

However, assuming for the moment that a= network operator has chosen to=20 allocate all SRv6 locators used in a domain from a single block, so that th= ere is a well-defined value of B and N across a domain, what is the use of = having a router advertise its own understanding of these two values?=C2=A0 = And what is a receiver supposed to do with this information?

=
Thanks,
Chris

=
On Fri, Feb 28, 2020 at 8:23 AM <<= a href=3D"mailto:bruno.decraene@orange.com">bruno.decraene@orange.com&g= t; wrote:

Hi Ketan,

=C2=A0

= Thanks fort the follow up.

= Clarification inline [Bruno]

= =C2=A0

=C2=A0

Hi= Bruno,

=C2=A0

I = believe the description and usage of Locator is very well described and cov= ered in the net-pgm draft as also the corresponding IGP extensions. Is the question is more about the =E2=80=9Cblock=E2=80=9D part= of it (what is not in the block part is in the node part as per the text i= n the net-pgm draft)?

=C2=A0

Th= e =E2=80=9Cblock=E2=80=9D is again not a new thing. Please check the follow= ing:

Un= der https://tools.ietf.org/html/draft-ietf-6man-segment-routing-header-26#secti= on-5 =E2=80=A6 look for =E2=80=9Cblock=E2=80=9D

h= ttps://tools.ietf.org/html/rfc8402#section-2 =E2=80=A6 look under SRGB = for SRv6

=C2=A0

[B= runo]

= To clarify, my question was not specific to =E2=80=9Cblock=E2=80=9D but rel= ated to the usage, by the receiver, of the following piece of information:

=C2=A0

=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 LB Length: SRv6 SID Locator Block length

=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 LN Length: SRv6 SID Locator Node length

=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Fun. Length: SRv6 SID Function length

=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Arg. Length: SRv6 SID Arguments length

= =C2=A0

= =C2=A0

So= perhaps I don=E2=80=99t get Chris=E2=80=99s point and would wait for him t= o clarify.

= [Bruno] I=E2=80=99ll leave this to Chris.

=C2=A0

Th= anks,

Ke= tan

=C2=A0

From: Lsr <lsr-bounces@ietf.org> On Behalf Of bruno.decraene@orange.com
Sent: 28 February 2020 14:34
To: Ketan Talaulikar (ketant) <ketant=3D40cisco.com@dmarc.ietf.org>; = Chris Bowers <chrisbowers.ietf@gmail.com>
Cc: lsr@ietf.org; SPRING WG List <spring@ietf.org>; draft-ietf-spring-srv6-network-programming <draft-ietf-spring-srv6-network-programming@ietf.org>; Pe= ter Psenak (ppsenak) <ppsenak@cisco.com>
Subject: Re: [Lsr] clarification of locator block and locator node i= n draft-ietf-spring-srv6-network-programming and draft-ietf-lsr-isis-srv6-e= xtensions

=C2=A0

Hi Ketan,

=C2=A0

=C2=A0

=C2=A0

From: Lsr [= mailto:lsr-bounce= s@ietf.org] On Behalf Of Ketan Talaulikar (ketant)
Sent: Friday, February 28, 2020 6:30 AM

=C2=A0

Hi= Chris,

=C2=A0

I = agree with Peter and I would suggest to drop LSR since this is not a protoc= ol specific thing.

=C2=A0

I = believe the text in draft-ietf-spring-srv6-network-programming clea= rs says what locator block and locator node are. What more details do you t= hink are required?

=C2=A0

[Bruno] Speaking as an individual, the draft c= ould possibly clarify the usage of these information/fields by the receiver= . Possibly using the same name/term (e.g. SRv6 SID Locator Block length) to ease the references betw= een both drafts.

=C2=A0

Thanks,

--Bruno

=C2=A0

Th= anks,

Ke= tan

=C2=A0

From: Lsr <lsr-bounces@ietf.org> On Behalf Of Chris Bowers
Sent: 27 February 2020 22:46
To: lsr@ietf.org; SPRING WG List <spring@ietf.org>
Cc: Peter Psenak (ppsenak) <ppsenak@cisco.com>
Subject: [Lsr] clarification of locator block and locator node in dr= aft-ietf-spring-srv6-network-programming and draft-ietf-lsr-isis-srv6-exten= sions

=C2=A0

SP= RING and LSR WGs,

=C2=A0

I = think that we need a much more detailed description of the locator block an= d locator node in either draft-ietf-spring-srv6-network-programming or draf= t-ietf-lsr-isis-srv6-extensions.=C2=A0 See original email below.

=C2=A0

Th= anks,

Ch= ris

=C2=A0

On= Thu, Feb 27, 2020 at 11:08 AM Peter Psenak <ppsenak@cisco.com> wrote:<= /span>

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
> 

_________________________________________=
___________________________________________________________________________=
_____
=C2=A0
Ce message et ses pieces jointes peuvent =
contenir des informations confidentielles ou privilegiees et ne doivent don=
c
pas etre diffuses, exploites ou copies sa=
ns autorisation. Si vous avez recu ce message par erreur, veuillez le signa=
ler
a l'expediteur et le detruire ainsi q=
ue les pieces jointes. Les messages electroniques etant susceptibles d'=
alteration,
Orange decline toute responsabilite si ce=
 message a ete altere, deforme ou falsifie. Merci.
=C2=A0
This message and its attachments may cont=
ain confidential or privileged information that may be protected by law;=

they should not be distributed, used or c=
opied without authorisation.
If you have received this email in error,=
 please notify the sender and delete this message and its attachments.
As emails may be altered, Orange is not l=
iable for messages that have been modified, changed or falsified.=

Thank you.
______________________________________________________________________=
___________________________________________________

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

This message and its attachments may contain confidential or privileged 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.
--000000000000ac4d17059fe3203d-- From nobody Mon Mar 2 10:23:33 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 DC93E3A0EAD for ; Mon, 2 Mar 2020 10:23:28 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.098 X-Spam-Level: X-Spam-Status: No, score=-2.098 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=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 FvZ1ZUmJTLOI for ; Mon, 2 Mar 2020 10:23:26 -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 A935E3A0EBA for ; Mon, 2 Mar 2020 10:23:26 -0800 (PST) Received: by mail-qk1-x72c.google.com with SMTP id b5so621210qkh.8 for ; Mon, 02 Mar 2020 10:23:26 -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=V94qYKEOBdFpuIztf1YwRNAkiitg5TbMyS/8TScXh5Y=; b=r8Z8gVAQgkpw3hTHzvWzD1+/DInl8cMGWVaN/LyfTv2RNrUYc9U6lV1tR7kWKn8DRG WnEGEJHKPBgGvGXGVAZQBIpXkIloa5fwoiaN34LKVlUQroJOpa54wyO2aQU2VkGqswfw +ky/FdCk5gQnVEdm+OW+Y622uEgwye03FIuAea71yIOVvoohNlVDT7C3wAbLIgq1Zb/X UxF+k8BW3wUYjMGL7RpGBZ6yuQQkRxlv4vLPtGXd/mMkEly+/VA1qw9bw72rA603Nw84 Y63e7//ALpRSyBu0UXaR+fmFFEUgX6djElKarQi+RMIUDdglBq0NtSyM6LYCNtxiBpqR 6RDQ== 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=V94qYKEOBdFpuIztf1YwRNAkiitg5TbMyS/8TScXh5Y=; b=JL3uBggrr3LthfqNpWBAP3DAchS/avr0E6Ot2sD/2OjlgS339ljwsit1lr4RxbBBBH YsD5JjVdUMv9LXD6uDX4fwlhgxQc9VBs52YaSgxobSvxokjYDhlxv/CEPAtO782aLpCr NnWz0HnC+WWhKRKKz7QcPxMZ0CzvGBLqQq3zfy+P5M0umfbu53RmzDAU6PGZp5fAniRM MpRyJClcXZ1Cg77jo0xWoJSfmaUNO9H0PFrnimDdzj33gxQnoVdYUJFqSMcgpQGXmBeG A4vKm90B8dQSh73cty3HPs7NqGP4/NKS9jFr80xINaywRUOvCCvTEbyJzMm443wt7ZlT PSKA== X-Gm-Message-State: ANhLgQ2dqVSyNmj0vf47UfJ2zyTerYRCaq81AhxhRpITO/nNU94j4wt+ JuQD0HbhrfwopjTubAmeHFBNxWr3jQsRCS5Ir4Dhtf9q X-Google-Smtp-Source: ADFU+vu5njZWz12YWMiDkteH1y+aDGQ4waNI4VTle1t62RlHLHre9KaaQ9K9TVzDtkRukqd/vYeSWfLg//fwzb7UQuE= X-Received: by 2002:a37:b285:: with SMTP id b127mr487971qkf.413.1583173405670; Mon, 02 Mar 2020 10:23:25 -0800 (PST) MIME-Version: 1.0 From: Chris Bowers Date: Mon, 2 Mar 2020 12:20:37 -0600 Message-ID: To: lsr@ietf.org Content-Type: multipart/alternative; boundary="00000000000076814a059fe34883" Archived-At: Subject: [Lsr] Implementation section of 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, 02 Mar 2020 18:23:29 -0000 --00000000000076814a059fe34883 Content-Type: text/plain; charset="UTF-8" LSR, I would like to update the implementation section of draft-ietf-lsr-isis-srv6-extensions to read: 11.3. Juniper Juniper's ISIS SRv6 implementation supports the following functionalities: Types of SID supported: End, End.X, LAN End.X Intra/Inter area/level support: Yes Anycast SID support: Yes, no A-flag support (Section 6) SID Structure Sub-Sub-TLV: No Thanks, Chris --00000000000076814a059fe34883 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable

LSR,


I would like to update t= he implementation section of draft-ietf-lsr-isis-srv6-extensions to read:


11.3.=C2=A0 Juniper

=C2=A0

=C2=A0=C2=A0 Juniper's ISI= S SRv6 implementation supports the following functionalities:

=C2=A0

=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Types of SID supported: End, End.X, LAN End.X

=C2=A0

=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Intra/Inter area/level support: Yes

=C2=A0

=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Anycast SID support: Yes, no A-flag support (Section 6)

=C2=A0

=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 SID Structure Sub-Sub-TLV: No


Thanks,

Chr= is

--00000000000076814a059fe34883-- From nobody Mon Mar 2 10:35:13 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 362F53A0E35; Mon, 2 Mar 2020 10:35:11 -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 auYmRbG9iHGe; Mon, 2 Mar 2020 10:35:09 -0800 (PST) Received: from mail-io1-xd2c.google.com (mail-io1-xd2c.google.com [IPv6:2607:f8b0:4864:20::d2c]) (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 89E673A0E33; Mon, 2 Mar 2020 10:35:09 -0800 (PST) Received: by mail-io1-xd2c.google.com with SMTP id d15so529170iog.3; Mon, 02 Mar 2020 10:35:09 -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=iOjhdbj0dzsXJuuEQAXKJt8LW3kQYiaRBAk89AoCFtg=; b=CVS5j2vobsS3JCToue1Pw1+/wv1xaP9cAaqEjlGZvj3/u/tOYsJUl5ySlgz/GynNe5 IYmxRLZGippHMfnXvaiVjaTwdDMFIh3HU0Mg6/SxYUlzxaPVIq5MT0tnUWweSdM7lFOX LmwmBEPMfMlTJYVdlPViViMKV4vclPR6F0Zn4uzJIg9dzyPS+lup9egBnDTLObO9Wm9N opvk8PhYlash6W0zpU8yk5VtPCixvotZDs4TYup14imtoHsbsJq5CLe10OK2nhfOcGh3 trL5C7SsOdsOyWSMFUlk7LkQeVDfA4OCTd+zXtJvbCdcr5t89+8tcU0KoCSAYM8nAB5r OJDA== 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=iOjhdbj0dzsXJuuEQAXKJt8LW3kQYiaRBAk89AoCFtg=; b=Z2evv1UunvggJLyCkyiqOM7esKAj37YiawVBuDi7fLJp8J6uS50h4nuCvsGZJaDy1G nis3f+xB/GGfU4EJMI41dK43WC8hLSSrEaUGXXP0Btn5jGNJKDZSVnsuDhfsBAJY5g/c ItIhJQXx/sihywMiA2Y4nEDJuMCLlkOZBJ1dj6BkS66LdArTQM8EUewS1ii/RITwVzhm 7H9wp+ipJAvoa0KtE+DalXNxOyvf0mAi457gS4uJAzIE1YnUhuQ0cmw4WDKZFTtAC4nV nprq2qrFx40LwVSx+zBztqqCWY0QcOCAxt/Ag3aD9h2aaZTufKcimvYAFSzvQHpwWZXd 8D6g== X-Gm-Message-State: ANhLgQ0pZm60TSU6dE5Carlj7IR40pI9+upbAcnK1RANU9rnyF+s2Ave /l1kFbJ3dO302Erp2j6c4iLvPn8N7MF2POJ47XdjqGk= X-Google-Smtp-Source: ADFU+vu33hLJERI4Nz/YkVSNHIToGcOKqZi9ayN5qKO6yZhBFnVZMdDglUHSGBdQBLAEjFaSi8PHhWG25AKmOBASMTo= X-Received: by 2002:a02:81cd:: with SMTP id r13mr436190jag.98.1583174108923; Mon, 02 Mar 2020 10:35:08 -0800 (PST) MIME-Version: 1.0 References: In-Reply-To: From: Yingzhen Qu Date: Mon, 2 Mar 2020 10:34:57 -0800 Message-ID: To: Peter Psenak Cc: lsr@ietf.org, lsr-chairs@ietf.org Content-Type: multipart/alternative; boundary="0000000000006148f7059fe37231" Archived-At: Subject: Re: [Lsr] IETF 107 LSR Presentation Slot Requests 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, 02 Mar 2020 18:35:11 -0000 --0000000000006148f7059fe37231 Content-Type: text/plain; charset="UTF-8" Hi Peter, Got it, will add it to the agenda. Thanks, Yingzhen On Mon, Mar 2, 2020 at 1:34 AM Peter Psenak wrote: > Hi Yingzhen, > > I would like to give a 10 mins update on ietf-lsr-flex-algo. > > thanks, > Peter > > On 28/02/2020 20:56, Yingzhen Qu wrote: > > 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 > > --0000000000006148f7059fe37231 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hi Peter,

Got it, will add it to the ag= enda.

Thanks,
Yingzhen

On Mon, Mar = 2, 2020 at 1:34 AM Peter Psenak <pp= senak@cisco.com> wrote:
Hi Yingzhen,

I would like to give a 10 mins update on ietf-lsr-flex-algo.

thanks,
Peter

On 28/02/2020 20:56, Yingzhen Qu wrote:
> Hi all,
>
> We're now accepting agenda request for the LSR Working Grouping me= eting
> IETF 107. Please send your requests to lsr-chairs@ietf.org
> <mailto:ls= r-chairs@ietf.org>=C2=A0indicating 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

--0000000000006148f7059fe37231-- From nobody Mon Mar 2 10:36:24 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id B4DD63A0E3E for ; Mon, 2 Mar 2020 10:36:22 -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 HBw07Fp0ezO5 for ; Mon, 2 Mar 2020 10:36:21 -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 5098A3A0E3B for ; 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02 Mar 2020 18:36:17 +0000 Received: from [10.60.140.53] (ams-ppsenak-nitro4.cisco.com [10.60.140.53]) by aer-core-4.cisco.com (8.15.2/8.15.2) with ESMTP id 022IaGbi020685; Mon, 2 Mar 2020 18:36:17 GMT To: Chris Bowers , lsr@ietf.org References: From: Peter Psenak Message-ID: Date: Mon, 2 Mar 2020 19:36:16 +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: Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-Outbound-SMTP-Client: 10.60.140.53, ams-ppsenak-nitro4.cisco.com X-Outbound-Node: aer-core-4.cisco.com Archived-At: Subject: Re: [Lsr] Implementation section of 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, 02 Mar 2020 18:36:23 -0000 Hi Chris, sure, will update the draft accordingly. thanks, Peter On 02/03/2020 19:20, Chris Bowers wrote: > LSR, > > > I would like to update the implementation section of > draft-ietf-lsr-isis-srv6-extensions to read: > > > 11.3.Juniper > > Juniper's ISIS SRv6 implementation supports the following functionalities: > > Types of SID supported: End, End.X, LAN End.X > > Intra/Inter area/level support: Yes > > Anycast SID support: Yes, no A-flag support (Section 6) > > SID Structure Sub-Sub-TLV: No > > > Thanks, > > Chris > From nobody Mon Mar 2 10:40:24 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 9D9C23A0ED1; 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Mon, 02 Mar 2020 10:40:19 -0800 (PST) MIME-Version: 1.0 References: <004a01d5f09d$2acf0640$806d12c0$@org.cn> In-Reply-To: <004a01d5f09d$2acf0640$806d12c0$@org.cn> From: Yingzhen Qu Date: Mon, 2 Mar 2020 10:40:08 -0800 Message-ID: To: Aijun Wang Cc: lsr@ietf.org, lsr-chairs@ietf.org Content-Type: multipart/alternative; boundary="000000000000e22abd059fe384c3" Archived-At: Subject: Re: [Lsr] IETF 107 LSR Presentation Slot Requests 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, 02 Mar 2020 18:40:22 -0000 --000000000000e22abd059fe384c3 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hi Aijun, Noted, will add it to the agenda. Thanks, Yingzhen On Mon, Mar 2, 2020 at 6:16 AM Aijun Wang wrote= : > HI, Yingzhen: > > > > We would like to apply 10 minutes to make a presentation about the draft > https://tools.ietf.org/html/draft-wang-lsr-passive-interface-attribute-00 > > The information about the presentation are the followings: > > > > Title: Passive Interface Attribute > > Presenter: Huaimo Chen/Aijun Wang > > Duration: 10 minutes > > Draft: > https://tools.ietf.org/html/draft-wang-lsr-passive-interface-attribute-00 > > > > > > Best Regards. > > > > Aijun Wang > > China Telecom > > > > *=E5=8F=91=E4=BB=B6=E4=BA=BA:* lsr-bounces@ietf.org [mailto:lsr-bounces@i= etf.org] *=E4=BB=A3=E8=A1=A8 *Yingzhen Qu > *=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4:* 2020=E5=B9=B42=E6=9C=8829=E6=97= =A5 3:57 > *=E6=94=B6=E4=BB=B6=E4=BA=BA:* lsr@ietf.org; lsr-chairs@ietf.org > *=E4=B8=BB=E9=A2=98:* [Lsr] IETF 107 LSR Presentation Slot Requests > > > > 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 > --000000000000e22abd059fe384c3 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hi Aijun,

Noted, will add it to the age= nda.

Thanks,
Yingzhen

On Mon, Mar 2= , 2020 at 6:16 AM Aijun Wang <wangaijun@tsinghua.org.cn> wrote:

HI, Yingzhen:

=C2=A0<= /span>

We would like to = apply 10 minutes to make a presentation about the draft https://tools.ietf.org/html/draft-w= ang-lsr-passive-interface-attribute-00

The information about the presentat= ion are the followings:

=C2=A0

= Title: =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0Passive Interface Attribute=

P= resenter: =C2=A0=C2=A0=C2=A0=C2=A0Huaimo Chen/Aijun Wang

Duration:=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0 10 minutes

Draft:=C2=A0=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://tools.ietf.org/html/draft-wang-lsr-passive= -interface-attribute-00

= =C2=A0

= =C2=A0

Best Regards.<= /u>

=C2=A0

Aijun Wang

China Telecom

=C2=A0<= u>

=E5=8F=91=E4=BB=B6=E4=BA=BA: lsr-bounce= s@ietf.org [mailto:lsr-bounces@ietf.org] = =E4=BB=A3=E8=A1=A8 Yingzhen Qu
=E5=8F=91=E9=80=81= =E6=97=B6=E9=97=B4: 2020=E5= =B9=B42=E6=9C=8829= =E6=97=A5 3:57
=E6=94=B6=E4=BB=B6=E4=BA= =BA: lsr@ietf.org; lsr-chairs@ietf.org
=E4= =B8=BB=E9=A2=98: [Lsr]= IETF 107 LSR Presentation Slot Requests

=C2=A0<= /p>

Hi all,<= /u>

=C2= =A0

We're now acce= pting agenda 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 d= esired duration (covering presentation and discussion).=C2=A0=

=C2=A0

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

=C2=A0

Thanks,

Yingzhen

<= /div>
--000000000000e22abd059fe384c3-- From nobody Mon Mar 2 10:42:27 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id E48963A0F04; Mon, 2 Mar 2020 10:42:24 -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 dNp1r9lpgBBS; Mon, 2 Mar 2020 10:42:23 -0800 (PST) Received: from mail-il1-x130.google.com (mail-il1-x130.google.com [IPv6:2607:f8b0:4864:20::130]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 6F5E53A0EF6; Mon, 2 Mar 2020 10:42:23 -0800 (PST) Received: by mail-il1-x130.google.com with SMTP id e8so361344ilc.13; Mon, 02 Mar 2020 10:42:23 -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 :cc; bh=QHcNsP5nq3Ky72fa/vQADxm28IwdPU1TlEMPBipgtPg=; b=V2M3Fgz6bbvCggwXpYyRuh0xG/n2zk2Wsd7/N4Su849C2cPmwXeK4J0CztzNCBMhm0 WfogknC6rQUIll1iSCi8kzb05Dx4zszOwO6GPXEDEDZuE1oLMSesht7JzgB96QAeBacn N1z62d9UfyxmmVSt+Omy31vo2ZZlCT4aG7JiKJcEagDIywVymmxQuilgitmF1pDkQUGE pXYlqa1eqIvTy2DiQEWET1P6Fzw6o/UrnvhAaCq39EUmIVGHegucPEmgnEeLW/7Tolyz O6iLLfGwdguqYYQ7neNcTqpSuIRYeye1wpxPi6CFBD+MNFaerFEO5zqWDIqEq2mfUWGk xDXQ== 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=QHcNsP5nq3Ky72fa/vQADxm28IwdPU1TlEMPBipgtPg=; b=g4pwtFfT3LehVb1gIxN6l+bxgcL3Xhg4wYOlM9vyMvxb3cTR8jniJke7CbCteASOKt 51gPmB3j59ZxfuDvDqd51dr8mqSUVSng+P4z+cbyizm/zJd7H4CNPKUfyub9MlS0OVLj fHEycvwUjq2Du0P5rmKpcZF3tb2n+rIxY8wMIXOJN3Z+klc1v2nhyTm2a95rzSu1Hpoc FAY5jCZYwsIBnPu3Fs8wKuFeEDBr0/REMPqchjpB1Tf5oHSJDeQ+Y2f5BEne8eF3vJJI Nb84w8p+cYtN4aZ38ZmyPHu9J6Knv+MdP8twZYBUEjgOL5eVsytHq8nnH7R3b6sTm2KF Mdig== X-Gm-Message-State: ANhLgQ3bIWkniD5l5VaVb6wDCLnN7XVZXE8/gr+z99X6xaxMinSR52cx +bPvf8L293vhjmFnA9m7ANTV6ttjXEhdpCRFQA== X-Google-Smtp-Source: ADFU+vvPUyLJlz97GXZGZFsFXOYq/xoofMdYzk8ylTWrhxWB12DgHUhZvwGGy8fNng8vdngxXPuQS+wNtcTNlub1BIQ= X-Received: by 2002:a92:1a0a:: with SMTP id a10mr925942ila.295.1583174542757; Mon, 02 Mar 2020 10:42:22 -0800 (PST) MIME-Version: 1.0 References: <1520992FC97B944A9979C2FC1D7DB0F404D9D5C6@DGGEML504-MBS.china.huawei.com> In-Reply-To: <1520992FC97B944A9979C2FC1D7DB0F404D9D5C6@DGGEML504-MBS.china.huawei.com> From: Yingzhen Qu Date: Mon, 2 Mar 2020 10:42:11 -0800 Message-ID: To: wangyali Cc: "lsr-chairs@ietf.org" , "lsr@ietf.org" Content-Type: multipart/alternative; boundary="0000000000003d1527059fe38c8d" Archived-At: Subject: Re: [Lsr] IETF 107 LSR Presentation Slot Requests 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, 02 Mar 2020 18:42:25 -0000 --0000000000003d1527059fe38c8d Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hi Yali, Received your remote presentation request, will add it to the agenda. Thanks, Yingzhen On Fri, Feb 28, 2020 at 7:03 PM wangyali wrote: > Dear chairs, secretary and all, > > > > This is Yali. It=E2=80=99s my honor to give a remote presentation for two= new > drafts (draft-liu-lsr-isis-ifit-node-capability-00 and > draft-wang-lsr-ospf-ifit-node-capability-00) and request duration around = 15 > min for these two draft. > > > > Everyone is welcome to give comments for these two drafts. Thank you. > > > > Best regards, > > Yali Wang > > > > *=E5=8F=91=E4=BB=B6=E4=BA=BA**:* Yingzhen Qu [mailto:yingzhen.ietf@gmail.= com] > *=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4:* 2020=E5=B9=B42=E6=9C=8829=E6=97= =A5 3:57 > *=E6=94=B6=E4=BB=B6=E4=BA=BA:* lsr@ietf.org; lsr-chairs@ietf.org > *=E4=B8=BB=E9=A2=98:* [Lsr] IETF 107 LSR Presentation Slot Requests > > > > 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 > --0000000000003d1527059fe38c8d Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hi Yali,

Received your remote presentat= ion request, will add it to the agenda.

Thanks,
Yingzhen

On Fri, Feb 28, 2020 at 7:03 PM wangyali <wangyali11@huawei.com> wrote:
<= /div>

Dear chairs, secretary and all,

=C2=A0

This is Yali. It=E2=80=99s my honor to give = a remote presentation for two new drafts (draft-liu-lsr-isis-ifit-node-capa= bility-00 and draft-wang-lsr-ospf-ifit-node-capability-00) and request duration around 15 min for these two draft.

=C2=A0

Everyone is welcome to give comments for the= se two drafts. Thank you.

=C2=A0

Best regards,

Yali Wang

=C2=A0

=E5=8F=91=E4=BB=B6= =E4=BA=BA: Yingzh= en Qu [mailto:yi= ngzhen.ietf@gmail.com]
=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 20= 20=E5=B9=B42=E6=9C=8829=E6=97=A5 3:57
=E6=94=B6=E4=BB=B6=E4=BA=BA: lsr@ietf.org; lsr-chairs@ietf.org
=E4=B8=BB=E9=A2=98: [Lsr] IETF 107 LSR P= resentation Slot Requests

=C2=A0

Hi all,

=C2=A0

We're now accepting agenda request for the LSR Working Group= ing meeting IETF 107. Please send your requests to=C2=A0lsr-chairs@ietf.org=C2=A0indicati= ng draft name, speaker, and desired duration (covering presentation and discu= ssion).=C2=A0

=C2=A0

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

=C2=A0

Thanks,

Yingzhen

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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: 6.119.0 Auto-Submitted: auto-generated Precedence: bulk Reply-To: lsr@ietf.org Message-ID: <158322928375.7881.1804477928718391946@ietfa.amsl.com> Date: Tue, 03 Mar 2020 01:54:43 -0800 Archived-At: Subject: [Lsr] I-D Action: draft-ietf-lsr-isis-srv6-extensions-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: Tue, 03 Mar 2020 09:54:44 -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-06.txt Pages : 25 Date : 2020-03-03 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-06 https://datatracker.ietf.org/doc/html/draft-ietf-lsr-isis-srv6-extensions-06 A diff from the previous version is available at: https://www.ietf.org/rfcdiff?url2=draft-ietf-lsr-isis-srv6-extensions-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 Tue Mar 3 10:20:45 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 83CD53A2525 for ; Tue, 3 Mar 2020 10:20:43 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.497 X-Spam-Level: X-Spam-Status: No, score=-1.497 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FORGED_FROMDOMAIN=0.25, FREEMAIL_FROM=0.001, HEADER_FROM_DIFFERENT_DOMAINS=0.25, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=no autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (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 s-zisO55Rppy for ; Tue, 3 Mar 2020 10:20:41 -0800 (PST) Received: from mail-pl1-x62e.google.com (mail-pl1-x62e.google.com [IPv6:2607:f8b0:4864:20::62e]) (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 67F973A2524 for ; Tue, 3 Mar 2020 10:20:41 -0800 (PST) Received: by mail-pl1-x62e.google.com with SMTP id ay11so1700048plb.0 for ; Tue, 03 Mar 2020 10:20:41 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=sender:from:mime-version:subject:message-id:references:to:date; bh=IlWLf2HzJUwEE+EhVQ+gNhVQOjuG2NBDRzx2jFVL7DA=; b=GIxnXZpeQXuqyCLF+LfJfk8O5UI0Tnqnsxgn4WLg9j4eAAj1VZNJUq71ntaI9ICivk Q/CXdTp5bVt7nRspcgEn5gsiyPlN0byb+DEmAUctV2vktHFhPxJhMRHAtWHAiKTNbaCy HrSSSIhGQFM/3hSL1UmhRI9UkoL9vyuJmASdLG/FyHhlzj8nzyzWiplCR5IRMkcc6iOG Eo3IsKekJ5XXOLFINfHoOyfnarZ9RxqLafpnnCBY0NCZiEBTseq8IsSPj4B88wJHO659 avOXk37SzDhcWBlb3wAMncMN8C5rINrahD8fDdbJ6wEvkAe1gYN3VM5FRR9hi4kuLnji ACfg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:from:mime-version:subject:message-id :references:to:date; bh=IlWLf2HzJUwEE+EhVQ+gNhVQOjuG2NBDRzx2jFVL7DA=; b=anUyJsLe+1H9F2MG8meIGNxHtZmuu/8q9uZqXI3fIYM8pEovCGdgPqY2l73WGLh3Sl XqNta+65ood5UFKBCsS9fa/JHFUTqkYQFLPYIumwAuC2EDGZhjF6s53qo7ryxjZ57F9t xrKza462qarpdJ6eJpSpICUCRaBh0pTrbD2nPfuef0jLMHhEAmS8RY5h2XBdlCaRw0wH wPu5zOSpfebsRp1fxOT2PSo3zOgSpfa6JleACf0OblzVEaThdP/wGdAKqIGQW/CIxt++ l6RYyKxNge3xlJ9etJqc211LiSUZkn3FkxPk3brtub6OFomZLVb4RAoNdFGAwZS4Xqef DFtQ== X-Gm-Message-State: ANhLgQ3fYBIoayeEn1BtxQNSIK/2yMYfXre+XX6Ij3dyLkIV46EoZT+H aDZ4pvGpPUIyrwwCeHeD4/ZaExWa X-Google-Smtp-Source: ADFU+vusIyTv/wV8qFeOdCEPmxmjbVs9bcUSe6mqiBiNEaiaDTPvvyZegFzPvI1YmxLBRP9o7QUSrA== X-Received: by 2002:a17:90a:348a:: with SMTP id p10mr5616261pjb.120.1583259639998; Tue, 03 Mar 2020 10:20:39 -0800 (PST) Received: from [172.22.73.47] ([162.210.130.3]) by smtp.gmail.com with ESMTPSA id i5sm3368947pju.42.2020.03.03.10.20.39 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 03 Mar 2020 10:20:39 -0800 (PST) Sender: Tony Li From: tony.li@tony.li Content-Type: multipart/alternative; boundary="Apple-Mail=_BAAE6193-A93D-4A59-86C9-93325480CEE1" Mime-Version: 1.0 (Mac OS X Mail 12.4 \(3445.104.11\)) Message-Id: <9EB459DD-9C82-4FC3-B9C1-6BEB4E1E59EA@tony.li> References: <158325939709.7765.6204332222255716698@ietfa.amsl.com> To: lsr@ietf.org Date: Tue, 3 Mar 2020 10:20:38 -0800 X-Mailer: Apple Mail (2.3445.104.11) Archived-At: Subject: [Lsr] Fwd: New Version Notification for draft-chen-lsr-dynamic-flooding-algorithm-00.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: Tue, 03 Mar 2020 18:20:44 -0000 --Apple-Mail=_BAAE6193-A93D-4A59-86C9-93325480CEE1 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=us-ascii Hi, We have submitted a draft that describes the Arista algorithm for = computing flooding topologies. This draft is informational and we are not proposing that this = transition to the standards track. If the working group chooses to do further work based on this, we have = no objections. Regards, Sarah & Tony > Begin forwarded message: >=20 > From: internet-drafts@ietf.org > Subject: New Version Notification for = draft-chen-lsr-dynamic-flooding-algorithm-00.txt > Date: March 3, 2020 at 10:16:37 AM PST > To: "Yunxia Chen" , "Tony Li" , = "Sarah Chen" >=20 >=20 > A new version of I-D, draft-chen-lsr-dynamic-flooding-algorithm-00.txt > has been successfully submitted by Tony Li and posted to the > IETF repository. >=20 > Name: draft-chen-lsr-dynamic-flooding-algorithm > Revision: 00 > Title: An Algorithm for Computing Dynamic Flooding = Topologies > Document date: 2020-03-03 > Group: Individual Submission > Pages: 9 > URL: = https://www.ietf.org/internet-drafts/draft-chen-lsr-dynamic-flooding-algor= ithm-00.txt > Status: = https://datatracker.ietf.org/doc/draft-chen-lsr-dynamic-flooding-algorithm= / > Htmlized: = https://tools.ietf.org/html/draft-chen-lsr-dynamic-flooding-algorithm-00 > Htmlized: = https://datatracker.ietf.org/doc/html/draft-chen-lsr-dynamic-flooding-algo= rithm >=20 >=20 > Abstract: > Link-state routing protocols suffer from excessive flooding in dense > network topologies. Dynamic flooding = [I-D.ietf-lsr-dynamic-flooding] > alleviates the problem by decoupling the flooding topology from the > physical topology. Link-state protocol updates are flooded only on > the sparse flooding topology while data traffic is still forwarded = on > the physical topology. >=20 > This document describes an algorithm to obtain a sparse subgraph = from > a dense graph. The resulting subgraph has certain desirable > properties and can be used as a flooding topology in dynamic > flooding. >=20 > This document discloses the algorithm that we have developed in = order > to make it easier for other developers to implement similar > algorithms. We do not claim that our algorithm is optimal, rather = it > is a pragmatic effort and we expect that further research and > refinement can improve the results. >=20 > We are not proposing that this algorithm be standardized, nor that > the working group use this as a basis for further standardization > work, however we have no objections if the working group chooses to > do so. >=20 >=20 >=20 >=20 > Please note that it may take a couple of minutes from the time of = submission > until the htmlized version and diff are available at tools.ietf.org. >=20 > The IETF Secretariat >=20 >=20 --Apple-Mail=_BAAE6193-A93D-4A59-86C9-93325480CEE1 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=us-ascii


Hi,

We have submitted a draft that describes the Arista algorithm = for computing flooding topologies.

This draft is informational and we are = not proposing that this transition to the standards track.
If the working group chooses to do further work based on = this, we have no objections.

Regards,
Sarah = & Tony



Begin forwarded = message:

From: = internet-drafts@ietf.org
Subject: = New Version = Notification for draft-chen-lsr-dynamic-flooding-algorithm-00.txt
Date: = March 3, 2020 at 10:16:37 AM = PST
To: = "Yunxia Chen" <sarahchen@arista.com>, "Tony Li" <tony.li@tony.li>, = "Sarah Chen" <sarahchen@arista.com>


A new version = of I-D, draft-chen-lsr-dynamic-flooding-algorithm-00.txt
has= been successfully submitted by Tony Li and posted to the
IETF repository.

Name: = draft-chen-lsr-dynamic-flooding-algorithm
Revision: 00
Title: An = Algorithm for Computing Dynamic Flooding Topologies
Document= date: = 2020-03-03
Group: Individual Submission
Pages:= = 9
URL: =            https://www.ietf.org/internet-drafts/draft-chen-lsr-dynamic-flo= oding-algorithm-00.txt
Status: =         https://datatracker.ietf.org/doc/draft-chen-lsr-dynamic-floodin= g-algorithm/
Htmlized: =       https://tools.ietf.org/html/draft-chen-lsr-dynamic-flooding-alg= orithm-00
Htmlized: =       https://datatracker.ietf.org/doc/html/draft-chen-lsr-dynamic-fl= ooding-algorithm


Abstract:
  Link-state routing = protocols suffer from excessive flooding in dense
=   network topologies.  Dynamic flooding = [I-D.ietf-lsr-dynamic-flooding]
  alleviates = the problem by decoupling the flooding topology from the
=   physical topology.  Link-state protocol updates are = flooded only on
  the sparse flooding topology = while data traffic is still forwarded on
  the = physical topology.

  This = document describes an algorithm to obtain a sparse subgraph from
  a dense graph.  The resulting subgraph has = certain desirable
  properties and can be used = as a flooding topology in dynamic
=   flooding.

  This = document discloses the algorithm that we have developed in order
  to make it easier for other developers to = implement similar
  algorithms.  We do not = claim that our algorithm is optimal, rather it
=   is a pragmatic effort and we expect that further research = and
  refinement can improve the results.

  We are not proposing that this = algorithm be standardized, nor that
  the = working group use this as a basis for further standardization
  work, however we have no objections if the = working group chooses to
  do so.




Please note that it may take a couple of minutes from the = time of submission
until the htmlized version and diff are = available at tools.ietf.org.

The IETF = Secretariat



= --Apple-Mail=_BAAE6193-A93D-4A59-86C9-93325480CEE1-- From nobody Tue Mar 3 11:00:50 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 198203A0043 for ; Tue, 3 Mar 2020 11:00:48 -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 nYbnDbqb5JEf for ; Tue, 3 Mar 2020 11:00:45 -0800 (PST) Received: from mail-il1-x133.google.com (mail-il1-x133.google.com [IPv6:2607:f8b0:4864:20::133]) (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 8A68F3A0046 for ; Tue, 3 Mar 2020 11:00:45 -0800 (PST) Received: by mail-il1-x133.google.com with SMTP id x2so3728715ila.9 for ; Tue, 03 Mar 2020 11:00:45 -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=dhfOn1tWs0Njzt1dnvy+A727slpSGs3CMcgwN4csZIA=; b=k4iLQ3rtTCURKf/Mu+URFouUklC8+D0gaBblPyI77CSqWw7KLwrokEHUCuRIOcJJrR W9NaY+exJlpU6Ez3ZEFUeSGuBou/Qw5STldAOUfxQPYTgzwyvwxh4M5bQybyo8fjGj5a H6tWwns5u2ZVOiBq6LD5dijMQH9qB86HeSQrRlTsJJODRFl+zRqSCVn67gNWK/+ULg3W A9NWqV3s8P40sXMl7zITC4wzCSKI7hx4+fpdjDjiRmghKKp+gGApNZ+WnKR5+ER+ftHw /Q8W4fP2Uy9cOwURzSDj6T4ZfvYlPjZjGvPiBieWHzHFexA4PCBnbOu9rAefvdCPfCUg oAQw== 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=dhfOn1tWs0Njzt1dnvy+A727slpSGs3CMcgwN4csZIA=; b=BfJ1q1/rdIsRkyHoTvX/QslxEdcE2ef4o43rbJBzDGwzi6UfIhRW/ww/f6WCZWN7kE AuNUAliq8r0eRgSA26aD/qSoCn8xuwrk6Qy+bUe288qBSklx7mXXGPyUwXmjeqwEnNO0 h0W3XM8ikOOg/aQexz+Jr2SLmEITcZoRzySQwdrvuQekgiqwgEO5cX5Z6qyU87jy/gv9 rSExWCzCzHZSVJrPRjoBjmE5sMqHtgn6n6PqEkf3Wgu7i2FsrCUySKoaSivkf8bowKF3 g/pIwozUHQkRyLakHSqrRXzOuv5av5aNdktxHbgeYM4KGZ+E81j2kD3cSugc1+aSoWBC 1yOQ== X-Gm-Message-State: ANhLgQ3rFx8jWK6fvuhzrThkkuju/dRFCau9KTazQgXk727rYksNYVXi qzjg/92wbwIewrC2ksqgkRIE+pcPmIpRT2sKUmfHGNfV X-Google-Smtp-Source: ADFU+vtQbLjdxAxP+2iZh+8Iaf8oPMr/jvTLHcbmiU62czSH5gmOHfmMZr9YqNLPDr5jY+X1rRtE3p4tWu/UabmqVPI= X-Received: by 2002:a92:194c:: with SMTP id e12mr5601069ilm.12.1583262044763; Tue, 03 Mar 2020 11:00:44 -0800 (PST) MIME-Version: 1.0 References: In-Reply-To: From: Sergey SHpenkov Date: Tue, 3 Mar 2020 21:58:19 +0300 Message-ID: To: "Acee Lindem (acee)" , lsr@ietf.org Content-Type: multipart/alternative; boundary="000000000000c3b914059ff7eb0a" 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: Tue, 03 Mar 2020 19:00:49 -0000 --000000000000c3b914059ff7eb0a Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hi Acee, To solve this problem, before starting 16.3, it is possible that all ABR routers (virtual endpoints) should update the cost of routes for ABRS (if these routes exist in the backbone area) from all virtual neighbors in the transit area, regardless of whether these costs have been improved or worsened. For example, router ABR_3 first checks sumLSA-4 from virtual neighbor ABR_1 in the transit area 0.0.0.200 and updates the cost for ABRS to 300 in the backbone area. After that, the calculation begins on the router ABR_3 16.3. It is a bad idea? :) Thansk, Sergey =D0=BF=D0=BD, 2 =D0=BC=D0=B0=D1=80. 2020 =D0=B3. =D0=B2 00:51, Acee Lindem = (acee) : > Hi Sergey, > > Seems it is a real problem that needs a solution. Let=E2=80=99s continue = the > discussion. > > Thanks, > > Acee > > > > *From: *Sergey SHpenkov > *Date: *Sunday, March 1, 2020 at 4:41 PM > *To: *Acee Lindem > *Subject: *Re: [Lsr] Question about OSPF (transit area routing loop) > > > > Hi Acee, > > Please tell me the discussion on the topic of "Question about OSPF > (transit area routing loop)" can be considered complete? > > Thanks, > Sergey > --000000000000c3b914059ff7eb0a Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hi Acee,

To solve this problem, before starting 16.= 3, it is possible that all ABR routers (virtual endpoints) should update th= e cost of routes for ABRS (if these routes exist in the backbone area) from= all virtual neighbors in the transit area, regardless of whether these cos= ts have been improved or worsened.

For example, router ABR_3 first c= hecks sumLSA-4 from virtual neighbor ABR_1 in the transit area 0.0.0.200 an= d updates the cost for ABRS to 300 in the backbone area. After that, the ca= lculation begins on the router ABR_3 16.3.

It is a bad idea? :)
<= br>Thansk,
Sergey

=D0=BF=D0=BD, 2 =D0=BC=D0=B0=D1=80. 2020 =D0=B3. =D0=B2= 00:51, Acee Lindem (acee) <acee@cisco= .com>:

Hi Sergey,

Seems it is a real problem that needs a solution. Le= t=E2=80=99s continue the discussion.

Thanks,

Acee

=C2=A0

From: Sergey SHpenkov <<= a href=3D"mailto:sergey.v.shpenkov@gmail.com" target=3D"_blank">sergey.v.sh= penkov@gmail.com>
Date: Sunday, March 1, 2020 at 4:41 PM
To: Acee Lindem <acee@cisco.com>
Subject: Re: [Lsr] Question about OSPF (transit area routing loop)

=C2=A0

Hi Acee,

Please tell me the discussion on the topic of "Question about OSPF (tr= ansit area routing loop)" can be considered complete?

Thanks,
Sergey

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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: Wed, 04 Mar 2020 11:05:42 -0000 --00000000000090b37205a00566a0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hi Acee, Fixed errata in a previous my post. To solve this problem, before starting 16.3, it is possible that all ABR routers (virtual endpoints) should update the cost of routes for all ASBRs (if these routes exist in the backbone area) from all virtual neighbors in the transit area, regardless of whether these costs have been improved or worsened. For example, router ABR_3 first checks sumLSA-4 from virtual neighbor ABR_1 in the transit area 0.0.0.200 and updates the cost for ASBR to 300 in the backbone area. After that, the calculation begins on the router ABR_3 16.3. It is a bad idea? Thanks, Sergey =D0=B2=D1=82, 3 =D0=BC=D0=B0=D1=80. 2020 =D0=B3. =D0=B2 21:58, Sergey SHpen= kov : > Hi Acee, > > To solve this problem, before starting 16.3, it is possible that all ABR > routers (virtual endpoints) should update the cost of routes for ABRS (if > these routes exist in the backbone area) from all virtual neighbors in th= e > transit area, regardless of whether these costs have been improved or > worsened. > > For example, router ABR_3 first checks sumLSA-4 from virtual neighbor > ABR_1 in the transit area 0.0.0.200 and updates the cost for ABRS to 300 = in > the backbone area. After that, the calculation begins on the router ABR_3 > 16.3. > > It is a bad idea? :) > > Thansk, > Sergey > > =D0=BF=D0=BD, 2 =D0=BC=D0=B0=D1=80. 2020 =D0=B3. =D0=B2 00:51, Acee Linde= m (acee) : > >> Hi Sergey, >> >> Seems it is a real problem that needs a solution. Let=E2=80=99s continue= the >> discussion. >> >> Thanks, >> >> Acee >> >> >> >> *From: *Sergey SHpenkov >> *Date: *Sunday, March 1, 2020 at 4:41 PM >> *To: *Acee Lindem >> *Subject: *Re: [Lsr] Question about OSPF (transit area routing loop) >> >> >> >> Hi Acee, >> >> Please tell me the discussion on the topic of "Question about OSPF >> (transit area routing loop)" can be considered complete? >> >> Thanks, >> Sergey >> > --00000000000090b37205a00566a0 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hi Acee,

Fixed errata in a previous my post.
To solve this problem, before starting 16.3, it is possible that all ABRrouters (virtual endpoints) should update the cost of routes for all ASBR= s (if
these routes exist in the backbone area) from all virtual neighbor= s in the
transit area, regardless of whether these costs have been impro= ved or
worsened.

For example, router ABR_3 first checks sumLSA-4 = from virtual neighbor ABR_1
in the transit area 0.0.0.200 and updates th= e cost for ASBR to 300 in the
backbone area. After that, the calculation= begins on the router ABR_3 16.3.

It is a bad idea?

Thanks,Sergey

=D0=B2=D1=82, 3 =D0=BC=D0=B0=D1=80. 2020 =D0=B3. =D0=B2 21:58, Serg= ey SHpenkov <sergey.v.shp= enkov@gmail.com>:
Hi Acee,

To solve this problem, before s= tarting 16.3, it is possible that all ABR routers (virtual endpoints) shoul= d update the cost of routes for ABRS (if these routes exist in the backbone= area) from all virtual neighbors in the transit area, regardless of whethe= r these costs have been improved or worsened.

For example, router AB= R_3 first checks sumLSA-4 from virtual neighbor ABR_1 in the transit area 0= .0.0.200 and updates the cost for ABRS to 300 in the backbone area. After t= hat, the calculation begins on the router ABR_3 16.3.

It is a bad id= ea? :)

Thansk,
Sergey

=D0=BF=D0=BD, 2 =D0=BC=D0=B0=D1=80. 2020 =D0= =B3. =D0=B2 00:51, Acee Lindem (acee) <acee@cisco.com>:

Hi Sergey,

Seems it is a real problem that needs a solution. Le= t=E2=80=99s continue the discussion.

Thanks,

Acee

=C2=A0

From: Sergey SHpenkov <<= a href=3D"mailto:sergey.v.shpenkov@gmail.com" target=3D"_blank">sergey.v.sh= penkov@gmail.com>
Date: Sunday, March 1, 2020 at 4:41 PM
To: Acee Lindem <acee@cisco.com>
Subject: Re: [Lsr] Question about OSPF (transit area routing loop)

=C2=A0

Hi Acee,

Please tell me the discussion on the topic of "Question about OSPF (tr= ansit area routing loop)" can be considered complete?

Thanks,
Sergey

--00000000000090b37205a00566a0-- From nobody Thu Mar 5 08:26:31 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 CE1153A1763; Thu, 5 Mar 2020 08:26:23 -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 wFHEo6gD2CLe; Thu, 5 Mar 2020 08:26:20 -0800 (PST) Received: from mail-qk1-x731.google.com (mail-qk1-x731.google.com [IPv6:2607:f8b0:4864:20::731]) (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 791893A176C; Thu, 5 Mar 2020 08:26:20 -0800 (PST) Received: by mail-qk1-x731.google.com with SMTP id z12so5836128qkg.12; Thu, 05 Mar 2020 08:26:20 -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=uKNE9Vtn5CMa8dPC9+Uj44RW19I8toAAyBHGF0PJe5w=; b=qVGwUpcGxooXBSO/Y79GwEqpzSRheBTxwFAMrknlW7XSwob7Vy17YVfeUHnceF3We1 V2xe26fNhBX0g52nAPHzkCDUJR6TN1lNAHI1V9xkjZ1DVwZy17oOJr9qs750eskQpx0B Vnr3ikkdzoCLawTMn56rWeJvZTr7O1ifC86tXijm0l/aUEsyyNJj/q415VQ4lUCXt+GI o091g3s6+Rl/sKjaeY4Lp2pNY+lb7sEx7zcbyTk/8iS/YfeN/E8GzCJII83PzJNOqi5C sDPblnSbPpxZHhB/n9BK22qyxCbuW/4wNpVhkNj84dgDyd4m3i53UygpC3ul+vHfc5cV JSZg== 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=uKNE9Vtn5CMa8dPC9+Uj44RW19I8toAAyBHGF0PJe5w=; b=aPwunJwKR4V77JlYzvXys7v3+ulE6tpqYIJLppEjFELVCR2Ouw/mugSinIh/udvadg /15PpKynnVcFfEbX0JYV79IBVh2m3SvKqDwWiJLAK6wdKyw/lv1sTUva0DKEBk0wTekI 1vgde0R8ig/54Yk+8ps0E/Di/vp9NOuZBRBPoNhlep3AiOLZ/zkxz084V+Iv8wvx+eQd YlCerkL0NajK1/RyjoHU8N48+bsKHoSa24xneAhVPdqC68TS0IYuok872Xdmt2tGTk6f jW4JsuvnCV0bkQ8eMEGTUXWWF+NPgHSc4hFdNCBIAbqHW08WHo8aflC2MulJe4SFoWGj SgTA== X-Gm-Message-State: ANhLgQ3VzaYP9QFuQXcVNh1KSHR50M4x29fVpwjOXq1JKPkS1QR6hBSL iHFYwB+cv1IlyK5SJPqJADHKTFLvs/zvBlfvHWA= X-Google-Smtp-Source: ADFU+vv6VZl88DKZlmv6OzvEn9ZXHDoHgibeXO3CzVwYK+zrswkCdpB+n8YAsKJf4b7laIx45m9O45QJWEDqeNdcpeI= X-Received: by 2002:a05:620a:21cb:: with SMTP id h11mr8945420qka.310.1583425579289; Thu, 05 Mar 2020 08:26:19 -0800 (PST) MIME-Version: 1.0 References: <12659_1582880639_5E58D77F_12659_66_1_53C29892C857584299CBF5D05346208A48DCA80D@OPEXCAUBM43.corporate.adroot.infra.ftgroup> <7453_1582899837_5E59227C_7453_80_1_53C29892C857584299CBF5D05346208A48DD14BA@OPEXCAUBM43.corporate.adroot.infra.ftgroup> In-Reply-To: From: Chris Bowers Date: Thu, 5 Mar 2020 10:23:29 -0600 Message-ID: To: "Ketan Talaulikar (ketant)" Cc: "Ketan Talaulikar (ketant)" , "lsr@ietf.org" , SPRING WG List , draft-ietf-spring-srv6-network-programming , "Peter Psenak (ppsenak)" , Bruno Decraene Content-Type: multipart/alternative; boundary="0000000000002e906f05a01dffe8" 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: Thu, 05 Mar 2020 16:26:24 -0000 --0000000000002e906f05a01dffe8 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Ketan, See inline [CB]. On Wed, Mar 4, 2020 at 12:36 AM Ketan Talaulikar (ketant) wrote: > Hi Chris, > > > > You are right in that there is no assumption that all SRv6 locators in a > domain are allocated from the same block. Therefore knowing the blocks us= ed > in the domain is useful. > [CB] Since you refer to "blocks" (plural) in this sentence, are you saying that in the scenario where all SRv6 locators in a domain are not allocated from the same block, you would expect different routers in the same domain to advertise different values of B and N? For example, assume we have a network where all SRv6 locators in a domain are not allocated from the same block. Router A advertises an SRv6 Locator TLV with locator =3D 2000::/64, and an SRv6 End SID sub-TLV with some endpoint behavior. Router B advertises an SRv6 Locator TLV with locator =3D 3000::/64, and an SRv6 End SID sub-TLV with some endpoint behavior. What should routers A and B advertise as the values of B and N in their SRv6 SID Structure Sub-Sub-TLVs ? > > > The IGP drafts covers the advertisement of the B and N parts of the > locally configured locator on the node via IGPs. On the receiver side, th= e > IGP may not really do much with this information, however it enables > propagation of this information from all nodes in the network to be > advertised out via BGP-LS (or other mechanisms) as part of the topology > feed. Once this is part of the topology feed, it enables use-cases on > controllers to perform network wide validation of the SRv6 SID block > provisioning and can also help in automation of the security aspects > described in > https://tools.ietf.org/html/draft-ietf-6man-segment-routing-header-26#sec= tion-5 > > > [CB] If an ISIS speaker is not expected to do anything with B and N, then I think the text in draft-ietf-lsr-isis-srv6-extensions needs to clarify this. I have a similar observation about Fun. Length and Arg. Length in the SRv6 SID Structure Sub-Sub-TLV . As far as I can tell, none of the endpoint behaviors that are currently specified to be carried in ISIS End, End.X, and LAN End.X SIDs sub-TLVs uses an Argument, so there is never a case where an SRv6 SID Structure Sub-Sub-TLV should have a non-zero value for Arg. Length. What should an ISIS speaker do if it receives a non-zero value of the Arg. Length for an endpoint behavior that doesn't use an argument? Are there any use cases envisioned where an ISIS speaker needs to know the Arg. Length ? Thanks, > > Ketan > > > > *From:* Chris Bowers > *Sent:* 02 March 2020 23:39 > *To:* Ketan Talaulikar (ketant) > *Cc:* Ketan Talaulikar (ketant) ; > lsr@ietf.org; SPRING WG List ; > draft-ietf-spring-srv6-network-programming < > draft-ietf-spring-srv6-network-programming@ietf.org>; Peter Psenak > (ppsenak) ; Bruno Decraene > *Subject:* Re: [Lsr] clarification of locator block and locator node in > draft-ietf-spring-srv6-network-programming and > draft-ietf-lsr-isis-srv6-extensions > > > > Ketan, > > > > Based on current documents, allocating all SRv6 locators used in a domain > from a single block is optional. > > > > However, assuming for the moment that a network operator has chosen to > allocate all SRv6 locators used in a domain from a single block, so that > there is a well-defined value of B and N across a domain, what is the use > of having a router advertise its own understanding of these two values? > And what is a receiver supposed to do with this information? > > > > Thanks, > > Chris > > > > On Fri, Feb 28, 2020 at 8:23 AM wrote: > > Hi Ketan, > > > > Thanks fort the follow up. > > Clarification inline [Bruno] > > > > *From**:* Ketan Talaulikar (ketant) [mailto:ketant@cisco.com] > *Sent:* Friday, February 28, 2020 11:11 AM > *To:* DECRAENE Bruno TGI/OLN; Ketan Talaulikar (ketant); Chris Bowers > *Cc:* lsr@ietf.org; SPRING WG List; > draft-ietf-spring-srv6-network-programming; Peter Psenak (ppsenak) > *Subject:* RE: [Lsr] clarification of locator block and locator node in > draft-ietf-spring-srv6-network-programming and > draft-ietf-lsr-isis-srv6-extensions > > > > Hi Bruno, > > > > I believe the description and usage of Locator is very well described and > covered in the net-pgm draft as also the corresponding IGP extensions. Is > the question is more about the =E2=80=9Cblock=E2=80=9D part of it (what i= s not in the block > part is in the node part as per the text in the net-pgm draft)? > > > > The =E2=80=9Cblock=E2=80=9D is again not a new thing. Please check the fo= llowing: > > Under > https://tools.ietf.org/html/draft-ietf-6man-segment-routing-header-26#sec= tion-5 > =E2=80=A6 look for =E2=80=9Cblock=E2=80=9D > > https://tools.ietf.org/html/rfc8402#section-2 =E2=80=A6 look under SRGB f= or SRv6 > > > > [Bruno] > > To clarify, my question was not specific to =E2=80=9Cblock=E2=80=9D but r= elated to the > usage, by the receiver, of the following piece of information: > > > > LB Length: SRv6 SID Locator Block length > > LN Length: SRv6 SID Locator Node length > > Fun. Length: SRv6 SID Function length > > Arg. Length: SRv6 SID Arguments length > > > > > > So perhaps I don=E2=80=99t get Chris=E2=80=99s point and would wait for h= im to clarify. > > [Bruno] I=E2=80=99ll leave this to Chris. > > > > Thanks, > > Ketan > > > > *From:* Lsr *On Behalf Of * > bruno.decraene@orange.com > *Sent:* 28 February 2020 14:34 > *To:* Ketan Talaulikar (ketant) ; > Chris Bowers > *Cc:* lsr@ietf.org; SPRING WG List ; > draft-ietf-spring-srv6-network-programming < > draft-ietf-spring-srv6-network-programming@ietf.org>; Peter Psenak > (ppsenak) > *Subject:* Re: [Lsr] clarification of locator block and locator node in > draft-ietf-spring-srv6-network-programming and > draft-ietf-lsr-isis-srv6-extensions > > > > Hi Ketan, > > > > > > > > *From:* Lsr [mailto:lsr-bounces@ietf.org ] *On > Behalf Of *Ketan Talaulikar (ketant) > *Sent:* Friday, February 28, 2020 6:30 AM > > > > Hi Chris, > > > > I agree with Peter and I would suggest to drop LSR since this is not a > protocol specific thing. > > > > I believe the text in draft-ietf-spring-srv6-network-programming clears > says what locator block and locator node are. What more details do you > think are required? > > > > [Bruno] Speaking as an individual, the draft could possibly clarify the > usage of these information/fields by the receiver. Possibly using the sam= e > name/term (e.g. SRv6 SID Locator Block length) to ease the references > between both drafts. > > > > Thanks, > > --Bruno > > > > Thanks, > > Ketan > > > > *From:* Lsr *On Behalf Of *Chris Bowers > *Sent:* 27 February 2020 22:46 > *To:* lsr@ietf.org; SPRING WG List > *Cc:* Peter Psenak (ppsenak) > *Subject:* [Lsr] clarification of locator block and locator node in > draft-ietf-spring-srv6-network-programming and > draft-ietf-lsr-isis-srv6-extensions > > > > SPRING and LSR WGs, > > > > I think that we need a much more detailed description of the locator bloc= k > 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 > > > > _________________________________________________________________________= ________________________________________________ > > > > Ce message et ses pieces jointes peuvent contenir des informations confid= entielles ou privilegiees et ne doivent donc > > pas etre diffuses, exploites ou copies sans autorisation. Si vous avez re= cu ce message par erreur, veuillez le signaler > > a l'expediteur et le detruire ainsi que les pieces jointes. Les messages = electroniques etant susceptibles d'alteration, > > Orange decline toute responsabilite si ce message a ete altere, deforme o= u falsifie. Merci. > > > > This message and its attachments may contain confidential or privileged i= nformation that may be protected by law; > > they should not be distributed, used or copied without authorisation. > > If you have received this email in error, please notify the sender and de= lete this message and its attachments. > > As emails may be altered, Orange is not liable for messages that have bee= n modified, changed or falsified. > > Thank you. > > _________________________________________________________________________= ________________________________________________ > > > > Ce message et ses pieces jointes peuvent contenir des informations confid= entielles ou privilegiees et ne doivent donc > > pas etre diffuses, exploites ou copies sans autorisation. Si vous avez re= cu ce message par erreur, veuillez le signaler > > a l'expediteur et le detruire ainsi que les pieces jointes. Les messages = electroniques etant susceptibles d'alteration, > > Orange decline toute responsabilite si ce message a ete altere, deforme o= u falsifie. Merci. > > > > This message and its attachments may contain confidential or privileged i= nformation that may be protected by law; > > they should not be distributed, used or copied without authorisation. > > If you have received this email in error, please notify the sender and de= lete this message and its attachments. > > As emails may be altered, Orange is not liable for messages that have bee= n modified, changed or falsified. > > Thank you. > > --0000000000002e906f05a01dffe8 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Ketan,

See inline [CB].
<= /div>

On Wed, Mar 4, 2020 at 12:36 AM Ketan Talaulikar (ketant) <ketant@cisco.com> wrote:
<= blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-l= eft:1px solid rgb(204,204,204);padding-left:1ex">

Hi Chris,

=C2=A0

You are right in that there is no assumption t= hat all SRv6 locators in a domain are allocated from the same block. Theref= ore knowing the blocks used in the domain is useful.

=
=C2=A0
[CB] Since you refer to "blocks&quo= t; (plural) in this sentence, are you saying that in the scenario where all= SRv6 locators in a domain are not allocated from the same block, you would= expect different routers in the same domain to advertise different values = of B and N?=C2=A0 For example, assume we have a network=20 where all SRv6 locators in a domain are not allocated from the same block.= =C2=A0 Router A advertises an SRv6 Locator TLV with locator =3D 2000::/64, = and an SRv6 End SID sub-TLV with some endpoint behavior.=C2=A0=20 Router B advertises an SRv6 Locator TLV with locator =3D 3000::/64, and an = SRv6 End SID sub-TLV with some endpoint behavior. What should routers A and= B advertise as the values of B and N in their SRv6 SID Structure Sub-Sub-T= LVs ?
=C2=A0

=C2=A0

The IGP drafts covers the advertisement of the= B and N parts of the locally configured locator on the node via IGPs. On t= he receiver side, the IGP may not really do much with this information, how= ever it enables propagation of this information from all nodes in the network t= o be advertised out via BGP-LS (or other mechanisms) as part of the topolog= y feed. Once this is part of the topology feed, it enables use-cases on con= trollers to perform network wide validation of the SRv6 SID block provisioning and can also help in automat= ion of the security aspects described in https://tools.ietf.org/html/draft= -ietf-6man-segment-routing-header-26#section-5

=C2=A0

[CB] = If an ISIS speaker is not expected to do anything with B and N, then I thin= k the text in draft-ietf-lsr-isis-srv6-extensions needs to clarify this.=C2= =A0 I have a similar observation about Fun. Length and Arg. Length in the= =20 SRv6 SID Structure Sub-Sub-TLV .=C2=A0 As far as I can tell, none of the en= dpoint behaviors that are currently specified to be carried in ISIS End, En= d.X, and LAN End.X SIDs sub-TLVs uses an Argument, so there is never a case= where an SRv6 SID Structure Sub-Sub-TLV should have a non-zero value for A= rg. Length. What should an ISIS speaker do if it receives a non-zero value = of the Arg. Length for an endpoint behavior that doesn't use an argumen= t?=C2=A0 Are there any use cases envisioned where an ISIS speaker needs to = know the Arg. Length ?=C2=A0

Thanks,

Ketan

=C2=A0

From: Chris Bowers <chrisbowers.ietf@gmail.com>
Sent: 02 March 2020 23:39
To: Ketan Talaulikar (ketant) <ketant@cisco.com>
Cc: Ketan Talaulikar (ketant) <ketant=3D40cisco.com@dmarc.ietf.org>; = lsr@ietf.org; SPRING = WG List <spring@iet= f.org>; draft-ietf-spring-srv6-network-programming <draft-ietf-spring-srv6-network-programming@ietf.org>; Peter Psenak = (ppsenak) <ppsena= k@cisco.com>; Bruno Decraene <bruno.decraene@orange.com>
Subject: Re: [Lsr] clarification of locator block and locator node i= n draft-ietf-spring-srv6-network-programming and draft-ietf-lsr-isis-srv6-e= xtensions

=C2=A0

Ketan,

=C2=A0

Based on current documents, allocating all SRv6 loca= tors used in a domain from a single block is optional.

=C2=A0

However, assuming for the moment that a network oper= ator has chosen to allocate all SRv6 locators used in a domain from a singl= e block, so that there is a well-defined value of B and N across a domain, = what is the use of having a router advertise its own understanding of these two values?=C2=A0 And what is a r= eceiver supposed to do with this information?

=C2=A0

Thanks,

Chris

=C2=A0

On Fri, Feb 28, 2020 at 8:23 AM <bruno.decraene@orange.com> wrote:

Hi = Ketan,

=C2= =A0

= Thanks fort the follow up.

= Clarification inline [Bruno]<= /p>

= =C2=A0

=C2=A0

Hi Bruno,

=C2=A0

I believe the description and usage of Locator is very well described and c= overed in the net-pgm draft as also the corresponding IGP extensions. Is th= e question is more about the =E2=80=9Cblock=E2=80=9D part of it (what is no= t in the block part is in the node part as per the text in the net-pgm draft)?

=C2=A0

The =E2=80=9Cblock=E2=80=9D is again not a new thing. Please check the foll= owing:

Under https://tools.ietf.org/html/draft-ietf-6man-segment-routing-header-26#secti= on-5 =E2=80=A6 look for =E2=80=9Cblock=E2=80=9D

https://tools.ietf.org/html/rfc8402#section-2 =E2=80=A6 look under SRG= B for SRv6

=C2=A0=

[Bruno]<= span lang=3D"FR">

To clarify, my = question was not specific to =E2=80=9Cblock=E2=80=9D but related to the usa= ge, by the receiver, of the following piece of information:

=C2=A0

=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 LB Length: SRv= 6 SID Locator Block length

=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 LN Length: SRv= 6 SID Locator Node length

=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Fun. Length: S= Rv6 SID Function length

=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Arg. Length: S= Rv6 SID Arguments length

= =C2=A0

=C2=A0

So perhaps I don=E2=80=99t get Chris=E2=80=99s point and would wait for him= to clarify.

[Bruno] I=E2=80= =99ll leave this to Chris.

=C2=A0

Thanks,

Ketan

=C2=A0

From: Lsr <lsr-bounces@ietf.org> On Behalf Of bruno.decraene@orange.com
Sent: 28 February 2020 14:34
To: Ketan Talaulikar (ketant) <ketant=3D40cisco.com@dmarc.ietf.org>; = Chris Bowers <chrisbowers.ietf@gmail.com>
Cc: lsr@ietf.org; SPRING WG List <spring@ietf.org>; draft-ietf-spring-srv6-network-programming <draft-ietf-spring-srv6-network-programming@ietf.org>; Peter Psenak (ppsenak) <ppsenak@cisco.com>
Subject: Re: [Lsr] clarification of locator block and locator node i= n draft-ietf-spring-srv6-network-programming and draft-ietf-lsr-isis-srv6-e= xtensions

=C2=A0

Hi Ketan,

=C2=A0

=C2=A0

=C2=A0

From: Lsr [mailto:lsr-bounces@ietf.org] On Behalf Of Ketan Talaulikar (ketant)
Sent: Friday, February 28, 2020 6:30 AM<= /u>

=C2=A0

Hi Chris,

=C2=A0

I agree with Peter and I would suggest to drop LSR since this is not a prot= ocol specific thing.

=C2=A0

I believe the text in draft-ietf-spring-srv6-network-p= rogramming clears says what locator block and locator node are. What more d= etails do you think are required?

=C2=A0

[Bruno] Speaking as an = individual, the draft could possibly clarify the usage of these information= /fields by the receiver. Possibly using the same name/term (e.g. SRv6 SID L= ocator Block length) to ease the references between both drafts.

=C2=A0

Thanks,

--Bruno

=C2=A0

Thanks,<= /p>

Ketan

=C2=A0

From: Lsr <lsr-bounces@ietf.org> On Behalf Of Chris Bowers
Sent: 27 February 2020 22:46
To: lsr@ietf.org; SPRING WG List <spring@ietf.org>
Cc: Peter Psenak (ppsenak) <ppsenak@cisco.com>
Subject: [Lsr] clarification of locator block and locator node in dr= aft-ietf-spring-srv6-network-programming and draft-ietf-lsr-isis-srv6-exten= sions

=C2=A0

SPRING and LSR WGs,

=C2=A0

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 dr= aft-ietf-lsr-isis-srv6-extensions.=C2=A0 See original email below.

=C2=A0

Thanks,

Chris

=C2=A0

On 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
> 

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--0000000000002e906f05a01dffe8-- From nobody Thu Mar 5 08:53:57 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 A676C3A0769; Thu, 5 Mar 2020 08:53:55 -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 UF1rs1EXGIEA; Thu, 5 Mar 2020 08:53:53 -0800 (PST) Received: from mail-ed1-x535.google.com (mail-ed1-x535.google.com [IPv6:2a00:1450:4864:20::535]) (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 BDE383A076C; Thu, 5 Mar 2020 08:53:52 -0800 (PST) Received: by mail-ed1-x535.google.com with SMTP id dc19so7601755edb.10; Thu, 05 Mar 2020 08:53:52 -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=G/HjQ2zlKcwoYrH9eeUE+80jCmGIX9jeESU7+/cQtyw=; b=Qx0O12yCvtRn2nGqEefoOI4LO1Rid4QKCiDiPV+egjzGvgWeoiePiplIl3ItORlU7x vbKOpDN9i+eLWKAnG7Qn94WIuObtNvYTj5ePvpELynNGZ1T+2dOM/MzW139C3FprfN6p Bx1pg3EPIlpod2SvOTAX43YCmciE/50rd6EC91/l4NS5hoJ1aBqRPbD7YchceUQu90lj rs4/kx0byy5XZrweNLIBdvB7iTHdMCkNaIaHObwwOl0R1VYARCFVdoNoE1J8YBKvuZwR S1pRHAvg9NqlOapVc/en6pH1XX82OTGoSyId2oSPW1N4pqpwAsOLg6SAq+S2124BU3Wq K1mw== 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=G/HjQ2zlKcwoYrH9eeUE+80jCmGIX9jeESU7+/cQtyw=; b=OORFi6L5Ru/faa6hxngKx7ozfSxhyOinMSlwP5pvTG5+Ug5IY/03Ha0jNrM5eBnm70 5c9KrJkMyeysfCaUVz5T0c4lPvJ4rZPS51ofuFpeRmnJLYN6AwxBfgAIq1p7KsP5tWfw pHBxSAJKHhfgo0JaWrjvc3EWVjsltQ1aO4B/4MuGR0RccSf7r/cLaTUsRMqUYzp/gC5f VCVXeCwHhz52QfErlKVemtMq4HbrMSZa1ExwJ7uJ+oJKlWTGPV7OGDI32jIqA+VB7YW7 3B5nK3mc4/LgPkF45ZhZuN5uYxrB+Z+UG92sBd+8nP3/j7nJUJ7+NV354GNrBmQfIN1R F3OA== X-Gm-Message-State: ANhLgQ3z2RwkMmutCphwo2d6U4ChnBGpdNbSzB7miyhaJkMibKuuijsG zULJn7xFqOzqueoyt7e1KG6v42ngWXwKvXzruxzJ0Y6U X-Google-Smtp-Source: ADFU+vtq9MHzj1388P9gXifbvGdFHOxtPLNjJQHPyxiFxAnMFSpqNjZ99wLlSNghrvhsFIZR8xaMP35rQ4GDEdRs5Qw= X-Received: by 2002:aa7:dc06:: with SMTP id b6mr7912198edu.336.1583427230861; Thu, 05 Mar 2020 08:53:50 -0800 (PST) Received: from 1058052472880 named unknown by gmailapi.google.com with HTTPREST; Thu, 5 Mar 2020 16:53:50 +0000 From: Alvaro Retana In-Reply-To: References: MIME-Version: 1.0 Date: Thu, 5 Mar 2020 16:53:50 +0000 Message-ID: To: "Les Ginsberg (ginsberg)" , "Acee Lindem (acee)" , "draft-ietf-isis-te-app@ietf.org" Cc: "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: Thu, 05 Mar 2020 16:53:56 -0000 On February 27, 2020 at 11:00:19 PM, Les Ginsberg wrote: Les: Hi! =C2=A0How are you? Some of the responses, yours and mine, feel like we're not communicating well, like we are talking past each other. =C2=A0I am probably not clearly asking the right questions... =C2=A0I think it would be a good idea to talk live. =C2=A0Let me know a time that works for you and we can set up a short call. =C2=A0Maybe the Shepherd can help us sort through things. Nonetheless, I responded to some of your comments. Thanks! Alvaro. ... > > > > 177 3. Legacy Advertisements > > ... > > > > [minor] Please add references to where all the values in this secti= on > > > > are defined...if the same as the references above. > > > > > > > [Les:] Done. > > > > Sorry, I meant the RFCs where the sub-TLVs are defined, not the registr= ies. > > [Les:] Well, the IANA registry identifies the Reference RFCs - and has th= e > advantage that it gets updated should that ever change. So I would sugges= t > providing a link to the registry is actually better than identifying the = RFC > for each code point. :-) > ?? [nit] I disagree because the RFC gives you the detail not just the value, which is what you originally get from the registry. Sure...it's just an indirection. ... > > > > [major] In a mixed network, where some routers support this > > > > specification, but other don't, it seems that setting the L-flag wo= uld > > > > 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 th= is. > > > > [nit] In the new =C2=A76.3.3 (Interoperability with Legacy Routers) it > > might be good to mention the setting of the L-flag. For example, > > extend Step 1, "Receiving routers continue to use legacy > > advertisements" to include a mention of the L-flag being set. > > > [Les:] This isn't a nit - it is a misunderstanding. > We aren't using L-bit here at all. > We are accommodating the coexistence of legacy/non-legacy routers. > > Legacy routers only send/receive legacy advertisements. They don't unders= tand > the new advertisements - let alone the L-bit. > > To migrate to all new routers - at which point legacy advertisements can = be > deprecated - you must follow the three steps described. The transition > between steps is controlled by some implementation specific knob. > > Please reread and let me know if it is clear. What I think I missed (even in the initial review) is this text (now in =C2=A76.1 - Use of Legacy Advertisements) which talks about the knob you mention: =C2=A0 =C2=A0Under the conditions defined above, implementations which supp= ort the =C2=A0 =C2=A0extensions defined in this document have the choice of using l= egacy =C2=A0 =C2=A0advertisements or application specific advertisements in suppo= rt of =C2=A0 =C2=A0SRTE and/or LFA. =C2=A0This will require implementations to pr= ovide =C2=A0 =C2=A0controls specifying which type of advertisements are to be sen= t/ =C2=A0 =C2=A0processed on receive for these applications. =C2=A0Further dis= cussion of =C2=A0 =C2=A0the associated issues can be found in Section 6.3. The steps in =C2=A76.3.3 are: =C2=A0 =C2=A01)Send application specific advertisements while continuing to =C2=A0 =C2=A0advertise using legacy (all advertisements are then duplicated= ). =C2=A0 =C2=A0Receiving routers continue to use legacy advertisements. =C2=A0 =C2=A02)Enable the use of the application specific advertisements on= all =C2=A0 =C2=A0routers =C2=A0 =C2=A03)Remove legacy advertisements I agree that this transition can be achieved with a knob. =C2=A0But it can also be achieved if the L-flag is set (during steps 1 and 2), right? Sure, the legacy routers won't know what the L-flag is, but the new ones will -- and will then use the legacy advertisements. The difference that I see is that the L-flag affects *all* the applications in the bit mask while the knob may be more specific. =C2=A0It would be very nice if some text was added about this to avoid more people misunderstanding. ... > > > > [major] "Undefined bits MUST be transmitted as 0 and MUST be ignore= d > > > > on receipt." What if the sender and the receiver support a differen= t > > > > set of applications? For example, suppose that the sender supports = a > > > > new application identified by the N-bit, and sets only that bit; th= e > > > > receiver treats the N-bit as undefined and ignores it. The result i= s > > > > 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? I guess that > > the receiver wouldn't see anything it understands... Would this be > > equivalent to zero-length masks? > > > [Les:] There are three cases: > > 1)You have application specific advertisements - which you send with the > appropriate bit(s) set in the mask. > > 2)You have application specific advertisements but want all applications = to > use them. You send with zero-length bit mask. > > 3)You have no advertisements. Maybe I'm not asking the question correctly... Let's talk about case 1, rtrA sets the appropriate bits...but rtrB (the receiver) doesn't understand any of them. =C2=A0Why not? =C2=A0It may = be that rtrA is signaling a set of new applications and rtrB hasn't been upgraded. IOW, rtrA is doing the right thing: sending application specific advertisements with the appropriate bits set in the mask. =C2=A0But because rtrB doesn't understand the bits (and ignores them) then it looks like no bits are set. I'm guessing that rtrB would just ignore the complete set of application specific advertisements: it wouldn't use them at all because there are no bits set (it ignores the ones that are). =C2=A0Is that the correct/expected behavior? Besides wanting to take guessing out of a specification, I'm asking all this because the other case where no bits are set is when the zero-length bit mask is used. =C2=A0In that case any application can use the parameters... > > > > [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 assign= ed > > > 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? I 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. > > > [Les:] How a router indicates that it supports a given application is out= side > the scope of this specification. > For example, > https://tools.ietf.org/html/draft-ietf-lsr-flex-algo-06#section-10 descri= bes > how this is done for flex-algo. I'm not asking you to make it in scope. =C2=A0Even if there is a way to advertise what is supported a router can still send advertisements for applications that not all the routers support. =C2=A0Yes, it may be a bug, it ma be a rogue router, etc.. If that happens, what are the issues? ... > > > > 337 4.2. Application Specific Link Attributes sub-TLV > > ... > > > > 361 Multiple Application Specific Link Attribute sub-TLVs for the s= ame > > > > 362 link MAY be advertised. When multiple sub-TLVs for the same lin= k are > > > > 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 v= alues > > > > 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 constrain= t is > > > > 372 violated, the L-flag MUST be considered set for this applicatio= n. > > > > > > > > [major] Tying these two paragraphs together... If one of the sub-TL= Vs > > > > 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) f= or > > > > a link... > > > > > > > [Les:] The text says: > > > > > > "Link attribute sub-sub-TLVs for the corresponding link attributes MU= ST > > > NOT be advertised for the set of applications specified in the > > > Standard/User Application Identifier Bit Masks and all such > > > advertisements MUST be ignored on receipt." > > > > > > There is no reason to send multiple sub-TLVs w L-bit set on a given l= ink > > > 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. Just that the risks are recognized. > > > > I'm mentioning this point about rogue nodes because that is the new > > focus of the SEC area. I 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. :-) > > > [Les:] Security discussions always seem to be a bit of a tug-of-war. > What you seem to be saying is that if an attacker gets "the keys", it > can fill a TLV with misinformation. I totally agree. But how are the new > TLVs defined in this document any different in this regard than existing > TLVs? > > An attacker today - given it has the keys - could advertise bogus neighbo= rs > or bogus metrics or... > > ?? True. =C2=A0However, this documents introduces something new that the attacker can do: it can signal application specific information. Before this document, the attacker didn't have the ability to pinpoint the attack to specific applications... The case mentioned above (inconsistently setting the L-flag to cause the advertisements to be ignored) is also not a simple thing to troubleshoot! ... > > 634 This document requests a new IANA registry be created to control th= e > > 635 assignment of sub-sub-TLV codepoints for the Application Specific > > 636 Link Attributes sub-TLV. The suggested name of the new registry is > > 637 "sub-sub-TLV code points for application specific link attributes". > > 638 The registration procedure is "Expert Review" as defined in > > 639 [RFC8126]. The following assignments are made by this document: ... > > [major] If the legacy specifications are extended, is it expected that > > new sub-sub-TLVs will also be created? If so, there need to be > > explicit instructions to the DEs in the legacy registries. > > > [Les:] Since the draft specifies that new applications MUST NOT use legac= y > sub-TLVs, the case you are concerned with cannot arise. I was thinking more of the existing applications extending the legacy... > > ... > > 663 This document requests a new IANA registry be created, under the > > 664 category of "Interior Gateway Protocol (IGP) Parameters", to > > control > > 665 the assignment of Application Identifier Bits. The suggested name > > of > > 666 the new registry is "Link Attribute Applications". The registration > > 667 policy for this registry is "Standards Action" ([RFC8126] and > > 668 [RFC7120]). The following assignments are made by this document: > > > > [minor] If we're setting up a applications, why not make it generic: > > "IGP Applications", for example...?? > > > [Les:] Because this is defining bit positions which only apply to the > SABM/UDABM fields in the new ASLA sub-TLV. For now... > > [minor] s/"Standards Action" ([RFC8126] and [RFC7120])./"Standards > > Action" [RFC8126]. Standards Action is only defined in rfc8126; > > the reference to rfc7120 is not needed. > > > [Les:] I copied this from RFC8665. Are you saying that document is incorr= ect? I am. ... > > 670 Bit # Name > > 671 --------------------------------------------------------- > > 672 0 RSVP-TE (R-bit) > > 673 1 Segment Routing Traffic Engineering (S-bit) > > 674 2 Loop Free Alternate (F-bit) > > > > [major] Add a line to cover the rest of the range and call it "Unassign= ed". > > > [Les:] Done The registry can't say "Additional bits are undefined". =C2=A0The correct text shold be: =C2=A0 =C2=A03-1015 =C2=A0 Unassigned > > 676 This document requests a new IANA registry be created to control th= e > > 677 assignment of sub-TLV types for the application specific SRLG TLV. > > 678 The suggested name of the new registry is "Sub-TLVs for TLV 238". > > 679 The registration procedure is "Expert Review" as defined in > > 680 [RFC8126]. The following assignments are made by this document: > > > > [major] Indicate where this registry should be created. > > > [Les:] Done That didn't make it in. ... > > 682 Value Description > > 683 --------------------------------------------------------- > > 684 0-3 Unassigned > > 685 4 Link Local/Remote Identifiers (see [RFC5307]) > > 686 5 Unassigned > > 687 6 IPv4 interface address (see [RFC5305]) > > 688 7 Unassigned > > 689 8 IPv4 neighbor address (see [RFC5305]) > > 690 9-11 Unassigned > > 691 12 IPv6 Interface Address (see [RFC6119]) > > 692 13 IPv6 Neighbor Address (see [RFC6119]) > > 693 14-255 Unassigned > > > > [major] Do you want the reference to the assignments to be this > > document, the RFC where the encoding is defined, or both? I would > > suggest both. Please add a column to reflect that: e.g., > > "[RFC5307] [This Document]"...and take out the "(see ...)" text. > > > [Les:] I added another column for "Encoding Reference" [nit] That's fine, but please add a note to indicate that the reference (for new values) should be the document where the encoding is defined and not where the value is assigned (which is what most people consider the default). > > 695 9. Security Considerations ... > > And then there are possible vulnerabilities introduced by this > > document. I 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. At best, this action could result in > > sub-optimal paths (by taking some links out of consideration)... > > Consider adding text related to that. > > [Les:] I have a harder time with this suggestion and so did not incorpora= te > it. See my replies above. See my replies above... 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15.20.2793.013; Thu, 5 Mar 2020 22:38:16 +0000 From: "Acee Lindem (acee)" To: Sergey SHpenkov , "lsr@ietf.org" Thread-Topic: [Lsr] Question about OSPF (transit area routing loop) Thread-Index: AQHV7BM5P9xnkM83402/rttn5UP+y6gr/BEAgAEV+oCAAd8ogIAFWi6A//+vwwCAA0gdgIABDZYAgAIAtAA= Date: Thu, 5 Mar 2020 22:38:15 +0000 Message-ID: <9BA854A7-38C4-4FFC-88C2-C453B4609A7B@cisco.com> References: In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: yes 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:c0c8:1007::1c1] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: 2b375c80-907d-4dd8-2fac-08d7c155e557 x-ms-traffictypediagnostic: BN8PR11MB3828: x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:9508; x-forefront-prvs: 03333C607F x-forefront-antispam-report: SFV:NSPM; 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AAVQAAVQAAVQAAVQIN0KAAHT3T/UDgVQAAVQAAVQAAVQAAVQAAVQAAVQAAVQAAXqVgAIWLeEFIAC KIACKIACKIACKIACKIACKIACKIACKIAC6VYACJju/qF2KIACKIACKIACKIACKIACKIACKIACKIAC KFC3AkDAuiWkABRAARRAARRAARRAARRAARRAARRAARRAARRItwL/H+0UxQrQ7OYFAAAAAElFTkSu QmCC --_004_9BA854A738C44FFC88C2C453B4609A7Bciscocom_-- From nobody Fri Mar 6 13:25:48 2020 Return-Path: X-Original-To: lsr@ietf.org Delivered-To: lsr@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id ED9C13A0B01; Fri, 6 Mar 2020 13:25:34 -0800 (PST) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: IETF Secretariat To: Cc: ipr-announce@ietf.org, lsr@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 6.119.0 Auto-Submitted: auto-generated Precedence: bulk Message-ID: <158352993495.2252.10796884215168286447@ietfa.amsl.com> Date: Fri, 06 Mar 2020 13:25:34 -0800 Archived-At: Subject: [Lsr] IPR Disclosure Arista Networks, Inc.'s Statement about IPR related to draft-ietf-lsr-dynamic-flooding and draft-chen-lsr-dynamic-flooding-algorithm 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, 06 Mar 2020 21:25:35 -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 2020-03-05 and has been posted on the "IETF Page of Intellectual Property Rights Disclosures" (https://datatracker.ietf.org/ipr/4044/). The title of the IPR disclosure is "Arista Networks, Inc.'s Statement about IPR related to draft-ietf-lsr-dynamic-flooding and draft-chen-lsr-dynamic-flooding-algorithm" Thank you IETF Secretariat From nobody Sat Mar 7 16:19:33 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 9F38D3A13F9; Sat, 7 Mar 2020 06:17:31 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.897 X-Spam-Level: X-Spam-Status: No, score=-1.897 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, SPF_HELO_NONE=0.001, SPF_NONE=0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id yJ5b7nn2o6t2; Sat, 7 Mar 2020 06:17:30 -0800 (PST) Received: from smtp.chopps.org (smtp.chopps.org [54.88.81.56]) by ietfa.amsl.com (Postfix) with ESMTP id 6B7503A12B7; Sat, 7 Mar 2020 06:17:27 -0800 (PST) Received: from stubbs.int.chopps.org (047-050-069-038.biz.spectrum.com [47.50.69.38]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by smtp.chopps.org (Postfix) with ESMTPSA id DE74F60D73; Sat, 7 Mar 2020 14:17:26 +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: <158322928375.7881.1804477928718391946@ietfa.amsl.com> Date: Sat, 7 Mar 2020 09:17:25 -0500 Cc: Christian Hopps , lsr@ietf.org Content-Transfer-Encoding: quoted-printable Message-Id: <5562D2CA-D4CB-4804-8795-F69E51FFEB97@chopps.org> References: <158322928375.7881.1804477928718391946@ietfa.amsl.com> To: draft-ietf-lsr-isis-srv6-extensions@ietf.org X-Mailer: Apple Mail (2.3608.40.2.2.4) Archived-At: Subject: [Lsr] bad xrefs [Re: I-D Action: draft-ietf-lsr-isis-srv6-extensions-06.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: Sat, 07 Mar 2020 14:17:32 -0000 X-List-Received-Date: Sat, 07 Mar 2020 14:17:32 -0000 I'm finding cross-references in this document to be incorrect, is = something wrong with the XML to foo generation? For example: Section 7.2 says sub-TLVs are defined in Section 6 (Advertising Anycast = Property) which I think is supposed to be Section 8 (Advertising SRv6 = Adjacency SIDs) Section 7.2, 8.1, 8.2 Endpoint Behavior references Section 9 (SRv6 SID = Structure Sub-Sub-TLV) which I think is supposed to be Section 10 = (Advertising Endpoint Behaviors) I have other comments but I'll send those separately. Thanks, Chris. > On Mar 3, 2020, at 4:54 AM, internet-drafts@ietf.org wrote: >=20 >=20 > 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. >=20 > 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-06.txt > Pages : 25 > Date : 2020-03-03 >=20 > 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. >=20 >=20 >=20 > The IETF datatracker status page for this draft is: > https://datatracker.ietf.org/doc/draft-ietf-lsr-isis-srv6-extensions/ >=20 > There are also htmlized versions available at: > https://tools.ietf.org/html/draft-ietf-lsr-isis-srv6-extensions-06 > = https://datatracker.ietf.org/doc/html/draft-ietf-lsr-isis-srv6-extensions-= 06 >=20 > A diff from the previous version is available at: > = https://www.ietf.org/rfcdiff?url2=3Ddraft-ietf-lsr-isis-srv6-extensions-06= >=20 >=20 > Please note that it may take a couple of minutes from the time of = submission > until the htmlized version and diff are available at tools.ietf.org. >=20 > Internet-Drafts are also available by anonymous FTP at: > ftp://ftp.ietf.org/internet-drafts/ >=20 >=20 > _______________________________________________ > I-D-Announce mailing list > I-D-Announce@ietf.org > https://www.ietf.org/mailman/listinfo/i-d-announce > Internet-Draft directories: http://www.ietf.org/shadow.html > or ftp://ftp.ietf.org/ietf/1shadow-sites.txt >=20 From nobody Sat Mar 7 16:19:51 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 7D3173A145D; Sat, 7 Mar 2020 06:46:38 -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, 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 PEQQtuDVOyXA; Sat, 7 Mar 2020 06:46:37 -0800 (PST) Received: from smtp.chopps.org (smtp.chopps.org [54.88.81.56]) by ietfa.amsl.com (Postfix) with ESMTP id A3DB83A145C; Sat, 7 Mar 2020 06:46:37 -0800 (PST) Received: from stubbs.int.chopps.org (047-050-069-038.biz.spectrum.com [47.50.69.38]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by smtp.chopps.org (Postfix) with ESMTPSA id 350D560D73; Sat, 7 Mar 2020 14:46:37 +0000 (UTC) From: Christian Hopps Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: quoted-printable Mime-Version: 1.0 (Mac OS X Mail 13.0 \(3608.40.2.2.4\)) Message-Id: Date: Sat, 7 Mar 2020 09:46:36 -0500 Cc: Christian Hopps , lsr@ietf.org To: draft-ietf-lsr-isis-srv6-extensions@ietf.org X-Mailer: Apple Mail (2.3608.40.2.2.4) Archived-At: Subject: [Lsr] "Legal" endpoint behaviors [draft-ietf-lsr-isis-srv6-extensions-06.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: Sat, 07 Mar 2020 14:46:38 -0000 X-List-Received-Date: Sat, 07 Mar 2020 14:46:38 -0000 1) I think we should have an IANA registry instead of just a table = defined in section 10 of draft-ietf-lsr-isis-srv6-extensions-06. The registry could be cross-referenced by and to "SRv6 Endpoint = Behaviors" for each protocol carrying these behaviors (IS-IS, OSPFv3, = ...). If/when new behaviors are added they could then update where they = are supposed to be advertised in the underlying protocols. 2) It's odd that we are referring to the section as "Legal Behaviors" in = the TLV definitions, and then in the actual section using "MAY" terms = and no "MUST"/"MUST NOT", but then using "Yes" and "No" in the table. Are these suggestions or are they documenting the required behavior? Thanks, Chris.= From nobody Sat Mar 7 16:19:54 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 B56903A146B; Sat, 7 Mar 2020 06:49:51 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.897 X-Spam-Level: X-Spam-Status: No, score=-1.897 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, SPF_HELO_NONE=0.001, SPF_NONE=0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id P8GB9HhVi-H0; Sat, 7 Mar 2020 06:49:50 -0800 (PST) Received: from smtp.chopps.org (smtp.chopps.org [54.88.81.56]) by ietfa.amsl.com (Postfix) with ESMTP id AF0953A146A; Sat, 7 Mar 2020 06:49:50 -0800 (PST) Received: from stubbs.int.chopps.org (047-050-069-038.biz.spectrum.com [47.50.69.38]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by smtp.chopps.org (Postfix) with ESMTPSA id 1203760D73; Sat, 7 Mar 2020 14:49:50 +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: Date: Sat, 7 Mar 2020 09:49:49 -0500 Cc: Christian Hopps , lsr@ietf.org Content-Transfer-Encoding: quoted-printable Message-Id: References: To: draft-ietf-lsr-isis-srv6-extensions@ietf.org X-Mailer: Apple Mail (2.3608.40.2.2.4) Archived-At: Subject: Re: [Lsr] "Legal" endpoint behaviors [draft-ietf-lsr-isis-srv6-extensions-06.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: Sat, 07 Mar 2020 14:49:52 -0000 X-List-Received-Date: Sat, 07 Mar 2020 14:49:52 -0000 Oops, That was "Speaking as a WG member". > On Mar 7, 2020, at 9:46 AM, Christian Hopps wrote: >=20 > 1) I think we should have an IANA registry instead of just a table = defined in section 10 of draft-ietf-lsr-isis-srv6-extensions-06. >=20 > The registry could be cross-referenced by and to "SRv6 Endpoint = Behaviors" for each protocol carrying these behaviors (IS-IS, OSPFv3, = ...). If/when new behaviors are added they could then update where they = are supposed to be advertised in the underlying protocols. >=20 > 2) It's odd that we are referring to the section as "Legal Behaviors" = in the TLV definitions, and then in the actual section using "MAY" terms = and no "MUST"/"MUST NOT", but then using "Yes" and "No" in the table. >=20 > Are these suggestions or are they documenting the required behavior? >=20 > Thanks, > Chris. From nobody Sun Mar 8 04:26:19 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 7C24F3A0AC0 for ; Sun, 8 Mar 2020 04:26:17 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.897 X-Spam-Level: X-Spam-Status: No, score=-1.897 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, SPF_HELO_NONE=0.001, SPF_NONE=0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id OCGdAY7099Sf for ; Sun, 8 Mar 2020 04:26:16 -0700 (PDT) Received: from smtp.chopps.org (smtp.chopps.org [54.88.81.56]) by ietfa.amsl.com (Postfix) with ESMTP id 473AF3A0ABE for ; Sun, 8 Mar 2020 04:26:16 -0700 (PDT) Received: from stubbs.int.chopps.org (047-050-069-038.biz.spectrum.com [47.50.69.38]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by smtp.chopps.org (Postfix) with ESMTPSA id AFE8E60D63; Sun, 8 Mar 2020 11:26:15 +0000 (UTC) Content-Type: text/plain; charset=utf-8 Mime-Version: 1.0 (Mac OS X Mail 13.0 \(3608.40.2.2.4\)) From: Christian Hopps In-Reply-To: Date: Sun, 8 Mar 2020 07:26:14 -0400 Cc: Christian Hopps , lsr@ietf.org Content-Transfer-Encoding: quoted-printable Message-Id: <6527D089-E226-4DD7-BBB2-E3ED30573557@chopps.org> References: To: Sergey SHpenkov X-Mailer: Apple Mail (2.3608.40.2.2.4) 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: Sun, 08 Mar 2020 11:26:18 -0000 Why does ABR_1 create a summary LSA to ASBR using the more expensive = non-backbone path? This would seem to violate 12.4.3: Else, if the destination of this route is an AS boundary router, a summary-LSA should be originated if and only if the routing table entry describes the preferred path to the AS boundary router (see Step 3 of Section 16.4). If so, a Type 4 summary-LSA is originated for the destination, with Link State ID equal to the AS boundary router's Router ID and metric equal to the routing table entry's cost. Note: these LSAs should not be generated if Area A has been configured as a stub area. But even so, why is ABR_1 even looking at a cost 300 path to summarize, = why would it not be looking at the cost 1 path it has through the = backbone? That's the path that ABR_3 has chosen when it forwarded = towards ABR_1 through RT_1, right? Thanks, Chris. > On Feb 26, 2020, at 2:19 AM, Sergey SHpenkov = wrote: >=20 > Acee, >=20 > Because ABR_1 creates SumLSA-4 for the ASBR not from the backbone = area. The cost of SumLSA-4 for ASBR is 300. >=20 > Thanks, > Sergey >=20 > =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, >=20 > I don=E2=80=99t see why RT_1 wouldn=E2=80=99t go through ABR_1 to get = to the ASBR. >=20 > Thanks, >=20 > Acee >=20 > =20 >=20 > From: Lsr on behalf of Sergey SHpenkov = > Date: Tuesday, February 25, 2020 at 2:38 PM > To: "lsr@ietf..org" > Subject: [Lsr] Question about OSPF (transit area routing loop) >=20 > =20 >=20 > Hi, >=20 > In section 16.3 of the OSPF RFC 2328 standard, it is stated that all = ABR routers >=20 > connected to a transit area are required to check the sumLSA contained = within >=20 > this area in order to possibly improve the intra-area and inter-area = backbone routes >=20 > for themselves. >=20 >=20 > See the picture: > > The RT_1 and ABR_3 routers will use different paths to the ASBR = router: >=20 > ABR_3 -> RT_1 -> ABR_1 -> ASBR =3D cost 3 > RT_1 -> ABR_3 -> ABR_2 -> ASBR =3D cost 21 >=20 > route loop between RT_1 and ABR_3 >=20 > Please explain this situation >=20 > Thanks, > Sergey >=20 > =20 >=20 > _______________________________________________ > Lsr mailing list > Lsr@ietf.org > https://www.ietf.org/mailman/listinfo/lsr From nobody Sun Mar 8 06:21:02 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 9CA3A3A0939 for ; Sun, 8 Mar 2020 06:20:44 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -9.6 X-Spam-Level: X-Spam-Status: No, score=-9.6 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, 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 header.b=JvKbdZsP; dkim=pass (1024-bit key) 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ICANCiAgICA+IA0KICAgID4gX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX18NCiAgICA+IExzciBtYWlsaW5nIGxpc3QNCiAgICA+IExzckBpZXRmLm9yZw0KICAg ID4gaHR0cHM6Ly93d3cuaWV0Zi5vcmcvbWFpbG1hbi9saXN0aW5mby9sc3INCiAgICANCiAgICBf X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fXw0KICAgIExzciBt YWlsaW5nIGxpc3QNCiAgICBMc3JAaWV0Zi5vcmcNCiAgICBodHRwczovL3d3dy5pZXRmLm9yZy9t YWlsbWFuL2xpc3RpbmZvL2xzcg0KICAgIA0KDQo= From nobody Mon Mar 9 01:20:51 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 D20F43A09ED for ; Mon, 9 Mar 2020 01:20:48 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.898 X-Spam-Level: X-Spam-Status: No, score=-1.898 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_BLOCKED=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 tdpfEXbiSxQ9 for ; Mon, 9 Mar 2020 01:20:42 -0700 (PDT) Received: from huawei.com (lhrrgout.huawei.com [185.176.76.210]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 96C133A09DD for ; Mon, 9 Mar 2020 01:20:42 -0700 (PDT) Received: from LHREML713-CAH.china.huawei.com (unknown [172.18.7.107]) by Forcepoint Email with ESMTP id 7DEA048707EEE334096C for ; Mon, 9 Mar 2020 08:20:40 +0000 (GMT) Received: from DGGEML424-HUB.china.huawei.com (10.1.199.41) by LHREML713-CAH.china.huawei.com (10.201.108.36) with Microsoft SMTP Server (TLS) id 14.3.408.0; Mon, 9 Mar 2020 08:20:39 +0000 Received: from DGGEML524-MBX.china.huawei.com ([169.254.1.105]) by dggeml424-hub.china.huawei.com ([10.1.199.41]) with mapi id 14.03.0439.000; Mon, 9 Mar 2020 16:20:33 +0800 From: wangyali To: "lsr@ietf.org" Thread-Topic: A new version of I-D, draft-liu-lsr-isis-ifit-node-capability-02 Thread-Index: AdX160PqpEiNp0glSrmxOyus22HBcg== Date: Mon, 9 Mar 2020 08:20:32 +0000 Message-ID: <1520992FC97B944A9979C2FC1D7DB0F404DB1AD4@dggeml524-mbx.china.huawei.com> Accept-Language: en-US Content-Language: zh-CN X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.108.203.186] Content-Type: multipart/alternative; boundary="_000_1520992FC97B944A9979C2FC1D7DB0F404DB1AD4dggeml524mbxchi_" MIME-Version: 1.0 X-CFilter-Loop: Reflected Archived-At: Subject: [Lsr] A new version of I-D, draft-liu-lsr-isis-ifit-node-capability-02 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, 09 Mar 2020 08:20:49 -0000 --_000_1520992FC97B944A9979C2FC1D7DB0F404DB1AD4dggeml524mbxchi_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Dear all, I'm Yali. Following is a new version of I-D, draft-liu-lsr-isis-ifit-node-c= apability-02 I submitted recently. Please let me know your questions and comments. Thank you. >>>>>>>>> Name: draft-liu-lsr-isis-ifit-node-capability Revision: 02 Title: IS-IS Extensions for Advertising IFIT Node Capabili= ty Document date: 2020-03-09 Group: Individual Submission Pages: 7 URL: https://www.ietf.org/internet-drafts/draft-liu-lsr-isis-ifi= t-node-capability-02.txt Status: https://datatracker.ietf.org/doc/draft-liu-lsr-isis-ifit-no= de-capability/ Htmlized: https://tools.ietf.org/html/draft-liu-lsr-isis-ifit-node-ca= pability-02 Htmlized: https://datatracker.ietf.org/doc/html/draft-liu-lsr-isis-if= it-node-capability Diff: https://www.ietf.org/rfcdiff?url2=3Ddraft-liu-lsr-isis-ifit= -node-capability-02 Abstract: This document defines a way for an Intermediate System to Intermediate System (IS-IS) routers to advertise IFIT(in-situ Flow Information Telemetry) capabilities. This document extends a new optional sub-TLV in the IS-IS Router CAPABILITY TLV [RFC7981], which allows a router to announce its IFIT node capabilities within an IS- IS level or the entire routing domain. Such advertisements enable IFIT applications in the network domain. Best Regards, Yali WANG E: wangyali11@huawei.com --_000_1520992FC97B944A9979C2FC1D7DB0F404DB1AD4dggeml524mbxchi_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Dear all,

 

I’m Yali. Following is a = new version of I-D, draft-liu-lsr-isis-ifit-node-capability-02 I submitted = recently.

 

Please let me know your questio= ns and comments. Thank you.

 

>>>>>>>>= ;> 

Name:    = ;           draft-liu-lsr= -isis-ifit-node-capability

Revision:  02

Title:   &nbs= p;            &= nbsp; IS-IS Extensions for Advertising IFIT Node Capability

Document date:  &n= bsp;    2020-03-09

Group:   &nbs= p;           Individual S= ubmission

Pages:   &nbs= p;           7=

URL:    =         https://www.ietf.org/internet-drafts/draft-liu-lsr-isis-ifit-node-capabilit= y-02.txt

Status:   &nb= sp;     https://datatracker.ietf.org/doc/draft-liu-lsr-isis-ifit-node-capability/

Htmlized:   &= nbsp;   https://tools.ietf.org/html/draft-liu-lsr-isis-ifit-node-capability-02<= o:p>

Htmlized:   &= nbsp;   https://datatracker.ietf.org/doc/html/draft-liu-lsr-isis-ifit-node-capabili= ty

Diff:    = ;       https://www.ietf.org/= rfcdiff?url2=3Ddraft-liu-lsr-isis-ifit-node-capability-02

 

Abstract:<= /p>

   This document d= efines a way for an Intermediate System to

   Intermediate Sy= stem (IS-IS) routers to advertise IFIT(in-situ Flow

   Information Tel= emetry) capabilities.  This document extends a new

   optional sub-TL= V in the IS-IS Router CAPABILITY TLV [RFC7981], which

   allows a router= to announce its IFIT node capabilities within an IS-

   IS level or the= entire routing domain.  Such advertisements enable<= /p>

   IFIT applicatio= ns in the network domain.

 

 

Best Regards,=

Yali WANG

E: wangyali11@huawei.com

 

--_000_1520992FC97B944A9979C2FC1D7DB0F404DB1AD4dggeml524mbxchi_-- From nobody Mon Mar 9 01:31:23 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 940B53A0A6E for ; Mon, 9 Mar 2020 01:31:13 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.615 X-Spam-Level: X-Spam-Status: No, score=-1.615 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, KHOP_HELO_FCRDNS=0.274, T_SPF_TEMPERROR=0.01, URIBL_BLOCKED=0.001] autolearn=no autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id o2mcoh2Z-t8O for ; Mon, 9 Mar 2020 01:31:07 -0700 (PDT) Received: from huawei.com (lhrrgout.huawei.com [185.176.76.210]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 449953A0AD7 for ; 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Mon, 9 Mar 2020 16:30:58 +0800 From: wangyali To: "lsr@ietf.org" Thread-Topic: New Version Notification for draft-wang-lsr-ospf-ifit-node-capability-02 Thread-Index: AdX168U2NNJyc/iuR2yPHOEmZosJUg== Date: Mon, 9 Mar 2020 08:30:57 +0000 Message-ID: <1520992FC97B944A9979C2FC1D7DB0F404DB1AF2@dggeml524-mbx.china.huawei.com> Accept-Language: en-US Content-Language: zh-CN X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.108.203.186] Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 MIME-Version: 1.0 X-CFilter-Loop: Reflected Archived-At: Subject: [Lsr] New Version Notification for draft-wang-lsr-ospf-ifit-node-capability-02 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, 09 Mar 2020 08:31:22 -0000 RGVhciBhbGwsDQoNCkknbSBZYWxpLiBGb2xsb3dpbmcgaXMgYSBuZXcgdmVyc2lvbiBvZiBJLUQs IGRyYWZ0LXdhbmctbHNyLW9zcGYtaWZpdC1ub2RlLWNhcGFiaWxpdHktMDIgSSBzdWJtaXR0ZWQg cmVjZW50bHkuDQoNClBsZWFzZSBsZXQgbWUga25vdyB5b3VyIHF1ZXN0aW9ucyBhbmQgY29tbWVu dHMuIFRoYW5rIHlvdS4NCg0KPj4+Pj4+Pj4+Pj4NCk5hbWU6CQlkcmFmdC13YW5nLWxzci1vc3Bm LWlmaXQtbm9kZS1jYXBhYmlsaXR5DQpSZXZpc2lvbjoJMDINClRpdGxlOgkJRXh0ZW5zaW9ucyB0 byBPU1BGIGZvciBBZHZlcnRpc2luZyBJRklUIE5vZGUgQ2FwYWJpbGl0eQ0KRG9jdW1lbnQgZGF0 ZToJMjAyMC0wMy0wOQ0KR3JvdXA6CQlJbmRpdmlkdWFsIFN1Ym1pc3Npb24NClBhZ2VzOgkJNw0K VVJMOiAgICAgICAgICAgIGh0dHBzOi8vd3d3LmlldGYub3JnL2ludGVybmV0LWRyYWZ0cy9kcmFm dC13YW5nLWxzci1vc3BmLWlmaXQtbm9kZS1jYXBhYmlsaXR5LTAyLnR4dA0KU3RhdHVzOiAgICAg ICAgIGh0dHBzOi8vZGF0YXRyYWNrZXIuaWV0Zi5vcmcvZG9jL2RyYWZ0LXdhbmctbHNyLW9zcGYt aWZpdC1ub2RlLWNhcGFiaWxpdHkvDQpIdG1saXplZDogICAgICAgaHR0cHM6Ly90b29scy5pZXRm Lm9yZy9odG1sL2RyYWZ0LXdhbmctbHNyLW9zcGYtaWZpdC1ub2RlLWNhcGFiaWxpdHktMDINCkh0 bWxpemVkOiAgICAgICBodHRwczovL2RhdGF0cmFja2VyLmlldGYub3JnL2RvYy9odG1sL2RyYWZ0 LXdhbmctbHNyLW9zcGYtaWZpdC1ub2RlLWNhcGFiaWxpdHkNCkRpZmY6ICAgICAgICAgICBodHRw czovL3d3dy5pZXRmLm9yZy9yZmNkaWZmP3VybDI9ZHJhZnQtd2FuZy1sc3Itb3NwZi1pZml0LW5v ZGUtY2FwYWJpbGl0eS0wMg0KDQpBYnN0cmFjdDoNCiAgIFRoaXMgZG9jdW1lbnQgZGVmaW5lcyBh IHdheSBmb3IgYW4gT3BlbiBTaG9ydGVzdCBQYXRoIEZpcnN0IChPU1BGKQ0KICAgcm91dGVyIG9y aWdpbmF0aW5nIHRoZSBSSSBMU0EgdG8gYW5ub3VuY2UgSUZJVCBub2RlIGNhcGFiaWxpdGllcw0K ICAgd2l0aGluIHRoZSBlbnRpcmUgcm91dGluZyBkb21haW4uICBBIG5ldyBvcHRpb25hbCBUTFYg aXMgZXh0ZW5kZWQgdG8NCiAgIHRoZSBPU1BGIFJJIE9wYXF1ZSBMU0EgW1JGQzc3NzBdIHRvIGNh cnJ5IHRoZSBJRklUIG5vZGUgY2FwYWJpbGl0eQ0KICAgaW5mb3JtYXRpb24uICBTdWNoIGFkdmVy dGlzZW1lbnRzIGVuYWJsZSBJRklUIGFwcGxpY2F0aW9ucyBpbiBhbg0KICAgb3BlcmF0aW9uYWwg bmV0d29yayBkb21haW4uICBIZXJlLCB0aGUgdGVybSAiT1NQRiIgaW5jbHVkZXMgYm90aA0KICAg T1NQRnYyIGFuZCBPU1BGdjMuDQoNCkJlc3QgcmVnYXJkcywNCllhbGkgV0FORw0K From nobody Mon Mar 9 03:29:50 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 799113A0C47 for ; 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09 Mar 2020 10:36:25 +0000 Received: from [10.60.140.51] (ams-ppsenak-nitro2.cisco.com [10.60.140.51]) by aer-core-2.cisco.com (8.15.2/8.15.2) with ESMTP id 029AaOqY012206; Mon, 9 Mar 2020 10:36:25 GMT To: Christian Hopps , draft-ietf-lsr-isis-srv6-extensions@ietf.org Cc: lsr@ietf.org References: From: Peter Psenak Message-ID: <6aaf0adf-397c-dbd8-fad2-7e73a344b2f6@cisco.com> Date: Mon, 9 Mar 2020 11:36:24 +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: 7bit X-Outbound-SMTP-Client: 10.60.140.51, ams-ppsenak-nitro2.cisco.com X-Outbound-Node: aer-core-2.cisco.com Archived-At: Subject: Re: [Lsr] "Legal" endpoint behaviors [draft-ietf-lsr-isis-srv6-extensions-06.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, 09 Mar 2020 10:36:32 -0000 Hi Chris, On 07/03/2020 15:46, Christian Hopps wrote: > 1) I think we should have an IANA registry instead of just a table defined in section 10 of draft-ietf-lsr-isis-srv6-extensions-06. > > The registry could be cross-referenced by and to "SRv6 Endpoint Behaviors" for each protocol carrying these behaviors (IS-IS, OSPFv3, ...). If/when new behaviors are added they could then update where they are supposed to be advertised in the underlying protocols. why do we need a protocol specific registry to advertise values that are defined in another protocol independent registry? I have never seen such a duplication. Looks completely redundant to me. > > 2) It's odd that we are referring to the section as "Legal Behaviors" in the TLV definitions, and then in the actual section using "MAY" terms and no "MUST"/"MUST NOT", but then using "Yes" and "No" in the table. a) Legal Behavior - refers to the set of values defined in the [I-D.ietf-spring-srv6-network-programming] which can be advertised in a particular TLV b) We can not use MUST in section 10, as all these TLVs are optional c) Yes/No means whether the particular behavior is allowed in the particular END-SID TLV. > > Are these suggestions or are they documenting the required behavior? these are limitations as to which behavior is allowed to be advertised in which TLV. thanks, Peter > > Thanks, > Chris. > From nobody Mon Mar 9 03:39:53 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 61DC03A0C62; Mon, 9 Mar 2020 03:39:52 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -9.601 X-Spam-Level: X-Spam-Status: No, score=-9.601 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIMWL_WL_MED=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, SPF_PASS=-0.001, URIBL_BLOCKED=0.001, USER_IN_DEF_DKIM_WL=-7.5] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=cisco.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id f-s_q9SQmWgN; Mon, 9 Mar 2020 03:39:51 -0700 (PDT) Received: from aer-iport-2.cisco.com (aer-iport-2.cisco.com [173.38.203.52]) (using TLSv1.2 with cipher DHE-RSA-SEED-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 7B62C3A0C46; Mon, 9 Mar 2020 03:39:50 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=2882; q=dns/txt; s=iport; t=1583750390; x=1584959990; h=subject:to:cc:references:from:message-id:date: mime-version:in-reply-to:content-transfer-encoding; bh=28n4MqUK7nE8beEMiIT33pzykeWtdKPxRQjpe2EaQ3c=; b=QVcfzjpD6dM4oRefRp8brO+/UWMQnrYzrBIl5wijavvsWES/U+e43Sde 0EJCzcEnxfG33f8NbmDnMlNnDYlNSaKX45UZk6mBndf7JU7LNdS6leGGv 64/cxsC5uw2wsiudor7VV/RI0Jmr1Kxcpx0xQTOIuZ7Mc0CgGr+49amP+ I=; X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: =?us-ascii?q?A0DwAgBBHGZe/xbLJq1jHAEBAQEBBwE?= =?us-ascii?q?BEQEEBAEBgXuDFVUgEiqEFYkDiBGbPgkBAQEOGA0KBAEBhEMCgjI4EwIDAQE?= =?us-ascii?q?LAQEFAQEBAgEFBG2FVgyFZAEBAQMBASEVNgsQCw4EBgICJgICJyIOBgEMBgI?= =?us-ascii?q?BAQWDHQGCew+mQ3WBMoQ1AQMCDkFAgy+BPoEOKoxGgUE/gRABJ4JtPoJZCwE?= =?us-ascii?q?BAQEBARiEWoJeBJdgl052gkaCUYUBjw4GHIJJgQCHIYQnjCSOdoh8hTONSoF?= =?us-ascii?q?pIoFYMxoIGxUaIYJsCUcYDY4pF4hkhUJAAzACjmcBAQ?= X-IronPort-AV: E=Sophos;i="5.70,532,1574121600"; d="scan'208";a="24211117" 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; 09 Mar 2020 10:39:48 +0000 Received: from [10.60.140.51] (ams-ppsenak-nitro2.cisco.com [10.60.140.51]) by aer-core-2.cisco.com (8.15.2/8.15.2) with ESMTP id 029Adle9012797; Mon, 9 Mar 2020 10:39:48 GMT To: Christian Hopps , draft-ietf-lsr-isis-srv6-extensions@ietf.org Cc: lsr@ietf.org References: <158322928375.7881.1804477928718391946@ietfa.amsl.com> <5562D2CA-D4CB-4804-8795-F69E51FFEB97@chopps.org> From: Peter Psenak Message-ID: <11dfac85-acb3-766e-8fd3-20215e10a8d4@cisco.com> Date: Mon, 9 Mar 2020 11:39:47 +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: <5562D2CA-D4CB-4804-8795-F69E51FFEB97@chopps.org> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-Outbound-SMTP-Client: 10.60.140.51, ams-ppsenak-nitro2.cisco.com X-Outbound-Node: aer-core-2.cisco.com Archived-At: Subject: Re: [Lsr] bad xrefs [Re: I-D Action: draft-ietf-lsr-isis-srv6-extensions-06.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, 09 Mar 2020 10:39:53 -0000 Hi Chris, you are right, there are some errors in cross-references, I'll fix them in next version. thanks, Peter On 07/03/2020 15:17, Christian Hopps wrote: > I'm finding cross-references in this document to be incorrect, is something wrong with the XML to foo generation? > > For example: > > Section 7.2 says sub-TLVs are defined in Section 6 (Advertising Anycast Property) which I think is supposed to be Section 8 (Advertising SRv6 Adjacency SIDs) > > Section 7.2, 8.1, 8.2 Endpoint Behavior references Section 9 (SRv6 SID Structure Sub-Sub-TLV) which I think is supposed to be Section 10 (Advertising Endpoint Behaviors) > > I have other comments but I'll send those separately. > > Thanks, > Chris. > >> On Mar 3, 2020, at 4:54 AM, 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-06.txt >> Pages : 25 >> Date : 2020-03-03 >> >> 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-06 >> https://datatracker.ietf.org/doc/html/draft-ietf-lsr-isis-srv6-extensions-06 >> >> A diff from the previous version is available at: >> https://www.ietf.org/rfcdiff?url2=draft-ietf-lsr-isis-srv6-extensions-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/ >> >> >> _______________________________________________ >> I-D-Announce mailing list >> I-D-Announce@ietf.org >> https://www.ietf.org/mailman/listinfo/i-d-announce >> Internet-Draft directories: http://www.ietf.org/shadow.html >> or ftp://ftp.ietf.org/ietf/1shadow-sites.txt >> > > > From nobody Mon Mar 9 05:26:44 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id D060F3A0EAE; Mon, 9 Mar 2020 05:26:33 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.897 X-Spam-Level: X-Spam-Status: No, score=-1.897 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, SPF_HELO_NONE=0.001, SPF_NONE=0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id ilFHEFWHIfjO; Mon, 9 Mar 2020 05:26:32 -0700 (PDT) Received: from smtp.chopps.org (smtp.chopps.org [54.88.81.56]) by ietfa.amsl.com (Postfix) with ESMTP id 639F13A0EBA; Mon, 9 Mar 2020 05:26:32 -0700 (PDT) Received: from stubbs.int.chopps.org (047-050-069-038.biz.spectrum.com [47.50.69.38]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by smtp.chopps.org (Postfix) with ESMTPSA id C85B360D6B; Mon, 9 Mar 2020 12:26:31 +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: <6aaf0adf-397c-dbd8-fad2-7e73a344b2f6@cisco.com> Date: Mon, 9 Mar 2020 08:26:30 -0400 Cc: Christian Hopps , draft-ietf-lsr-isis-srv6-extensions@ietf.org, lsr@ietf.org Content-Transfer-Encoding: quoted-printable Message-Id: <72F687B9-EF8C-443B-96AD-09BADD690E0C@chopps.org> References: <6aaf0adf-397c-dbd8-fad2-7e73a344b2f6@cisco.com> To: Peter Psenak X-Mailer: Apple Mail (2.3608.40.2.2.4) Archived-At: Subject: Re: [Lsr] "Legal" endpoint behaviors [draft-ietf-lsr-isis-srv6-extensions-06.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, 09 Mar 2020 12:26:43 -0000 > On Mar 9, 2020, at 6:36 AM, Peter Psenak = wrote: >=20 > Hi Chris, >=20 > On 07/03/2020 15:46, Christian Hopps wrote: >> 1) I think we should have an IANA registry instead of just a table = defined in section 10 of draft-ietf-lsr-isis-srv6-extensions-06. >> The registry could be cross-referenced by and to "SRv6 Endpoint = Behaviors" for each protocol carrying these behaviors (IS-IS, OSPFv3, = ...). If/when new behaviors are added they could then update where they = are supposed to be advertised in the underlying protocols. >=20 > why do we need a protocol specific registry to advertise values that = are defined in another protocol independent registry? I have never seen = such a duplication. Looks completely redundant to me. You are creating some new sub TLVs (End, End.X, LAN End.X), and you are = restricting and directing which externally defined behaviors (values) = can be advertised in which of these TLVs. The registry would keep track = of this (e.g., "Valid behaviors for sub-TLVs End, End.X, LAN End.X") What happens when new behaviors are defined (externally), which TLVs are = they supposed to be advertised in? Either the document that defines the = new behavior or a related LSR document will have to indicate where this = new behavior should be advertised too. That new document would update = this registry to track that. Keeping track of this stuff is what = registries are for.=20 Your table literally looks like a template for the initial content of a = registry. :) Later in your IANA section you are updating other registries that bear a = striking resemblance to this (e.g., what sub-TLV types are valid to = advertise in what TLVs). >> 2) It's odd that we are referring to the section as "Legal Behaviors" = in the TLV definitions, and then in the actual section using "MAY" terms = and no "MUST"/"MUST NOT", but then using "Yes" and "No" in the table. >=20 > a) Legal Behavior - refers to the set of values defined in the = [I-D.ietf-spring-srv6-network-programming] which can be advertised in a = particular TLV >=20 > b) We can not use MUST in section 10, as all these TLVs are optional What's wrong with "If this behavior is advertised it MUST only be = advertised in the TLV[s] as indicated by "Y" in the table below, and = MUST NOT be advertised in the TLV[s] as indicated by "N" in the table = below." or something like that. Thanks, Chris. (as WG member) > c) Yes/No means whether the particular behavior is allowed in the = particular END-SID TLV. >=20 >> Are these suggestions or are they documenting the required behavior? >=20 > these are limitations as to which behavior is allowed to be advertised = in which TLV. > thanks, > Peter >=20 >> Thanks, >> Chris. >=20 > _______________________________________________ > Lsr mailing list > Lsr@ietf.org > https://www.ietf.org/mailman/listinfo/lsr >=20 From nobody Mon Mar 9 06:50:00 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 444593A1079; Mon, 9 Mar 2020 06:49:51 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -9.6 X-Spam-Level: X-Spam-Status: No, score=-9.6 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, SPF_PASS=-0.001, 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[draft-ietf-lsr-isis-srv6-extensions-06.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, 09 Mar 2020 13:49:58 -0000 SGkgUGV0ZXIsIENocmlzLCANCg0KSSBhZ3JlZSB0aGF0IGEgbnVtYmVyIG9mIElTLUlTIElBTkEg cmVnaXN0cmllcyBoYXZlIHRoaXMgbGV2ZWwgb2Ygc3BlY2lmaWNhdGlvbi4gRm9yIGV4YW1wbGU6 DQoNCmh0dHBzOi8vd3d3LmlhbmEub3JnL2Fzc2lnbm1lbnRzL2lzaXMtdGx2LWNvZGVwb2ludHMv aXNpcy10bHYtY29kZXBvaW50cy54aHRtbCNpc2lzLXRsdi1jb2RlcG9pbnRzLTIyLTIzLTI1LTE0 MS0yMjItMjIzDQoNClRoYW5rcywNCkFjZWUNCg0K77u/T24gMy85LzIwLCA4OjI4IEFNLCAiTHNy IG9uIGJlaGFsZiBvZiBDaHJpc3RpYW4gSG9wcHMiIDxsc3ItYm91bmNlc0BpZXRmLm9yZyBvbiBi ZWhhbGYgb2YgY2hvcHBzQGNob3Bwcy5vcmc+IHdyb3RlOg0KDQogICAgDQogICAgDQogICAgPiBP biBNYXIgOSwgMjAyMCwgYXQgNjozNiBBTSwgUGV0ZXIgUHNlbmFrIDxwcHNlbmFrPTQwY2lzY28u Y29tQGRtYXJjLmlldGYub3JnPiB3cm90ZToNCiAgICA+IA0KICAgID4gSGkgQ2hyaXMsDQogICAg 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charset="us-ascii" Content-Transfer-Encoding: quoted-printable Yali - What is missing for me is an explanation of why IFIT Capability information= is something that is appropriate to be sent using IGP Router Capability ad= vertisements. Generally speaking, we prefer to restrict IGP advertisements to information= which is of direct use to the protocol. However, it is fair to say that we= have relaxed this restriction in some cases e.g.: https://www.iana.org/go/rfc7883 https://www.iana.org/go/rfc8491 However, even in these cases the information advertised is of value to some= entity executing on the protocol peers - even if not directly by the IGP i= tself. I see no such value add here i.e., the IFIT capability information may well= be of value to a controller but I do not see any use case for any entity o= n protocol peers. So why should we use IGPs to send this information to all other IGP peers w= hen none of them can make use of this information? Les From: Lsr On Behalf Of wangyali Sent: Monday, March 09, 2020 1:21 AM To: lsr@ietf.org Subject: [Lsr] A new version of I-D, draft-liu-lsr-isis-ifit-node-capabilit= y-02 Dear all, I'm Yali. Following is a new version of I-D, draft-liu-lsr-isis-ifit-node-c= apability-02 I submitted recently. Please let me know your questions and comments. Thank you. >>>>>>>>> Name: draft-liu-lsr-isis-ifit-node-capability Revision: 02 Title: IS-IS Extensions for Advertising IFIT Node Capabili= ty Document date: 2020-03-09 Group: Individual Submission Pages: 7 URL: https://www.ietf.org/internet-drafts/draft-liu-lsr-isis-ifi= t-node-capability-02.txt Status: https://datatracker.ietf.org/doc/draft-liu-lsr-isis-ifit-no= de-capability/ Htmlized: https://tools.ietf.org/html/draft-liu-lsr-isis-ifit-node-ca= pability-02 Htmlized: https://datatracker.ietf.org/doc/html/draft-liu-lsr-isis-if= it-node-capability Diff: https://www.ietf.org/rfcdiff?url2=3Ddraft-liu-lsr-isis-ifit= -node-capability-02 Abstract: This document defines a way for an Intermediate System to Intermediate System (IS-IS) routers to advertise IFIT(in-situ Flow Information Telemetry) capabilities. This document extends a new optional sub-TLV in the IS-IS Router CAPABILITY TLV [RFC7981], which allows a router to announce its IFIT node capabilities within an IS- IS level or the entire routing domain. Such advertisements enable IFIT applications in the network domain. Best Regards, Yali WANG E: wangyali11@huawei.com --_000_MW3PR11MB4619361A2CA3A402A44914E5C1FE0MW3PR11MB4619namp_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Yali –

 

What is missing for= me is an explanation of why IFIT Capability information is something that = is appropriate to be sent using IGP Router Capability advertisements.<= /o:p>

 

Generally speaking,= we prefer to restrict IGP advertisements to information which is of direct= use to the protocol. However, it is fair to say that we have relaxed this = restriction in some cases e.g.:

 

https://www.iana.org/go/rfc7883

https://www.iana.org/go/rfc8491

 

However, even in th= ese cases the information advertised is of value to some entity executing o= n the protocol peers – even if not directly by the IGP itself.

 

I see no such value= add here i.e., the IFIT capability information may well be of value to a c= ontroller but I do not see any use case for any entity on protocol peers.

So why should we us= e IGPs to send this information to all other IGP peers when none of them ca= n make use of this information?

 

    = Les

 

 

From: = Lsr <lsr-bounces@ietf.org> On Behalf Of wangyali
Sent: Monday, March 09, 2020 1:21 AM
To: lsr@ietf.org
Subject: [Lsr] A new version of I-D, draft-liu-lsr-isis-ifit-node-ca= pability-02

 =

Dear all,=

&nbs= p;

I’m= Yali. Following is a new version of I-D, draft-liu-lsr-isis-ifit-node-capa= bility-02 I submitted recently.

&nbs= p;

Please le= t me know your questions and comments. Thank you.

&nbs= p;

>>&= gt;>>>>>> 

Name:&= nbsp;           &nbs= p;  draft-liu-lsr-isis-ifit-node-capability

Revisi= on:  02

Title:=             &nb= sp;     IS-IS Extensions for Advertising IFIT Node Capa= bility

Docume= nt date:       2020-03-09

Group:=             &nb= sp;  Individual Submission

Pages:=             &nb= sp;  7

URL:&n= bsp;           https://www.ietf.org/internet-drafts/draft-liu-lsr-isis-ifit-node-capabilit= y-02.txt

Status= :         https://datatracker.ietf.org/doc/draft-liu-lsr-isis-ifit-node-capability/

Htmliz= ed:       https://tools.ietf.org/html/draft-liu-lsr-isis-ifit-node-capability-02<= o:p>

Htmliz= ed:       https://datatracker.ietf.org/doc/html/draft-liu-lsr-isis-ifit-node-capabili= ty

Diff:&= nbsp;          https://www.ietf.org/rfcdiff?url2=3Ddraft-liu-lsr-isis-ifit-node-capabilit= y-02

&= nbsp;

Abstra= ct:

 =   This document defines a way for an Intermediate System to=

 =   Intermediate System (IS-IS) routers to advertise IFIT(in-situ Flow

 =   Information Telemetry) capabilities.  This document extends a n= ew

 =   optional sub-TLV in the IS-IS Router CAPABILITY TLV [RFC7981], which=

 =   allows a router to announce its IFIT node capabilities within an IS-=

 =   IS level or the entire routing domain.  Such advertisements ena= ble

 =   IFIT applications in the network domain.

&nbs= p;

&nbs= p;

Best Rega= rds,

Yali WANG=

E: wangyali11@huawei.com

&nbs= p;

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bmNsdWRlcyBib3RoDQogICAgICAgT1NQRnYyIGFuZCBPU1BGdjMuDQogICAgDQogICAgQmVzdCBy ZWdhcmRzLA0KICAgIFlhbGkgV0FORw0KICAgIF9fX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fDQogICAgTHNyIG1haWxpbmcgbGlzdA0KICAgIExzckBpZXRmLm9y Zw0KICAgIGh0dHBzOi8vd3d3LmlldGYub3JnL21haWxtYW4vbGlzdGluZm8vbHNyDQogICAgDQoN Cg== From nobody Tue Mar 10 01:57:43 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 7A0533A0E4F for ; Tue, 10 Mar 2020 01:57:41 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.899 X-Spam-Level: X-Spam-Status: No, score=-1.899 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, 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 SdJx-F4hJdxZ for ; Tue, 10 Mar 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(10.201.108.71) with Microsoft SMTP Server (version=TLS1_0, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA) id 15.1.1713.5 via Frontend Transport; Tue, 10 Mar 2020 08:57:36 +0000 Received: from DGGEML524-MBX.china.huawei.com ([169.254.1.105]) by dggeml422-hub.china.huawei.com ([10.1.199.39]) with mapi id 14.03.0439.000; Tue, 10 Mar 2020 16:57:14 +0800 From: wangyali To: "Les Ginsberg (ginsberg)" , "lsr@ietf.org" Thread-Topic: A new version of I-D, draft-liu-lsr-isis-ifit-node-capability-02 Thread-Index: AdX160PqpEiNp0glSrmxOyus22HBcgAah/PwABjBRgA= Date: Tue, 10 Mar 2020 08:57:14 +0000 Message-ID: <1520992FC97B944A9979C2FC1D7DB0F404DB2336@dggeml524-mbx.china.huawei.com> References: <1520992FC97B944A9979C2FC1D7DB0F404DB1AD4@dggeml524-mbx.china.huawei.com> In-Reply-To: Accept-Language: en-US Content-Language: zh-CN X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.108.203.186] Content-Type: multipart/alternative; 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Dear Le= s,

&n= bsp;

Thanks = a lot for your comments. I will take your suggestion to add description on = how to use the IFIT Capability information when the submission is opened.

&n= bsp;

As desc= ribed in my reply to Acee, following is my quick reply:

&n= bsp;

IFIT is= deployed in a specific domain referred as the IFIT domain. One network dom= ain may consists of multiple IFIT domain. Within the IFIT domain, one or mo= re IFIT-options are added into packet at the IFIT-enabled head node that is referred to as the =A1=B0IFIT encaps= ulating node=A1=B1. Then IFIT data fields MAY be updated by IFIT transit no= des that the packet traverses. Finally, the data fields are removed at a de= vice that is referred to as the =A1=B0IFIT decapsulating node=A1=B1.

&n= bsp;

The IFI= T data fields must not leak to other domains. So, the IFIT encapsulating no= de need to know if the decapsulating node is able to support the IFIT capab= ility. So that it can decide whether to add the IFIT-option or not.

&n= bsp;

The sol= ution is similar to RFC8491. We use IGP to advertise the capability, so tha= t head node can use. By using BGP-LS, a centralized controller can also lea= rn the IFIT Capability of nodes to determine whether a particular IFIT Option type can be supported in a given network.=

&n= bsp;

Best re= gards,

Yali

&n= bsp;

=B7=A2=BC=FE=C8=CB: Les Ginsberg (ginsberg) [mailto:ginsberg@cisco.com]
=B7=A2=CB=CD=CA=B1=BC=E4:<= /span> 2020=C4=EA3=D4=C210=C8=D5 5:07
=CA=D5=BC=FE=C8=CB: wangyali <wangyali11@huawei.com>; lsr@ietf.org
=D6=F7=CC=E2: RE: A new version of I-D, draft-liu-lsr-isis-ifit-node-capability-02=

 

Yali= =A8C

 

What= is missing for me is an explanation of why IFIT Capability information is = something that is appropriate to be sent using IGP Router Capability advert= isements.

 

Gene= rally speaking, we prefer to restrict IGP advertisements to information whi= ch is of direct use to the protocol. However, it is fair to say that we hav= e relaxed this restriction in some cases e.g.:

 

https://www.iana.org/go/rfc7883=

https://www.iana.org/go/rfc8491=

 

Howe= ver, even in these cases the information advertised is of value to some ent= ity executing on the protocol peers =A8C even if not directly by the IGP it= self.

 

I se= e no such value add here i.e., the IFIT capability information may well be = of value to a controller but I do not see any use case for any entity on pr= otocol peers.

So w= hy should we use IGPs to send this information to all other IGP peers when = none of them can make use of this information?

 

&nbs= p;   Les

 

 

From: Lsr <lsr-bounces@ietf.org> On Behalf Of wangyali
Sent: Monday, March 09, 2020 1:21 AM
To: lsr@ietf.org
Subject: [Lsr] A new version of I-D, draft-liu-lsr-isis-ifit-node-ca= pability-02

 

Dear all,

 

I=A1=AFm Yali. Following is a n= ew version of I-D, draft-liu-lsr-isis-ifit-node-capability-02 I submitted r= ecently.

 

Please let me know your questio= ns and comments. Thank you.

 

>>>>>>>>= ;> 

Name:    = ;           draft-liu-lsr= -isis-ifit-node-capability

Revision:  02

Title:   &nbs= p;            &= nbsp; IS-IS Extensions for Advertising IFIT Node Capability

Document date:  &n= bsp;    2020-03-09

Group:   &nbs= p;           Individual S= ubmission

Pages:   &nbs= p;           7=

URL:    =         https://www.ietf.org/internet-drafts/draft-liu-lsr-isis-ifit-node-capabilit= y-02.txt

Status:   &nb= sp;     https://datatracker.ietf.org/doc/draft-liu-lsr-isis-ifit-node-capability/

Htmlized:   &= nbsp;   https://tools.ietf.org/html/draft-liu-lsr-isis-ifit-node-capability-02<= o:p>

Htmlized:   &= nbsp;   https://datatracker.ietf.org/doc/html/draft-liu-lsr-isis-ifit-node-capabili= ty

Diff:    = ;       https://www.ietf.org/= rfcdiff?url2=3Ddraft-liu-lsr-isis-ifit-node-capability-02

 

Abstract:<= /p>

   This document d= efines a way for an Intermediate System to

   Intermediate Sy= stem (IS-IS) routers to advertise IFIT(in-situ Flow

   Information Tel= emetry) capabilities.  This document extends a new

   optional sub-TL= V in the IS-IS Router CAPABILITY TLV [RFC7981], which

   allows a router= to announce its IFIT node capabilities within an IS-

   IS level or the= entire routing domain.  Such advertisements enable<= /p>

   IFIT applicatio= ns in the network domain.

 

 

Best Regards,=

Yali WANG

E: wangyali11@huawei.com

 

--_000_1520992FC97B944A9979C2FC1D7DB0F404DB2336dggeml524mbxchi_-- From nobody Tue Mar 10 03:09:57 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 7A5B13A0B5E; Tue, 10 Mar 2020 03:09:55 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -9.601 X-Spam-Level: X-Spam-Status: No, score=-9.601 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIMWL_WL_MED=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, SPF_PASS=-0.001, URIBL_BLOCKED=0.001, USER_IN_DEF_DKIM_WL=-7.5] autolearn=unavailable autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=cisco.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id AQiHHrUk1Y4f; Tue, 10 Mar 2020 03:09:52 -0700 (PDT) Received: from aer-iport-1.cisco.com (aer-iport-1.cisco.com [173.38.203.51]) (using TLSv1.2 with cipher DHE-RSA-SEED-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id EF7483A0B31; Tue, 10 Mar 2020 03:09:51 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=4326; q=dns/txt; s=iport; t=1583834992; x=1585044592; h=subject:to:cc:references:from:message-id:date: mime-version:in-reply-to:content-transfer-encoding; bh=NK9g/OQT3MA0Bs/kJCKJgCtX+EPq2g+bFh8BVOo2Re0=; b=BW4BC5UJUWvh1hHFqBxWpMc1k1noF+E/2F3eWJwiU2XoAKV07Ilo2nSW qQVI3IFC5SiEm77s/MmoCGH8oUWk5qnDucPGhtOVFcB6xVrGzwunu27oY /t01I6ARA+mOx7nTF7xvDcc1G8WQhm/fxfNt+AIBG15pPaF8cs2EJWvfk k=; X-IronPort-AV: E=Sophos;i="5.70,536,1574121600"; d="scan'208";a="24248380" Received: from aer-iport-nat.cisco.com (HELO aer-core-1.cisco.com) ([173.38.203.22]) by aer-iport-1.cisco.com with ESMTP/TLS/DHE-RSA-SEED-SHA; 10 Mar 2020 10:09:50 +0000 Received: from [10.60.140.51] (ams-ppsenak-nitro2.cisco.com [10.60.140.51]) by aer-core-1.cisco.com (8.15.2/8.15.2) with ESMTP id 02AA9ntl027376; Tue, 10 Mar 2020 10:09:49 GMT To: "Acee Lindem (acee)" , Christian Hopps , Peter Psenak Cc: "lsr@ietf.org" , "draft-ietf-lsr-isis-srv6-extensions@ietf.org" References: <6aaf0adf-397c-dbd8-fad2-7e73a344b2f6@cisco.com> <72F687B9-EF8C-443B-96AD-09BADD690E0C@chopps.org> <3D94EBBD-7F28-4A82-9B95-728DA99E337D@cisco.com> From: Peter Psenak Message-ID: <15aac211-359f-d369-05e4-9c6413001ba7@cisco.com> Date: Tue, 10 Mar 2020 11:09:49 +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: <3D94EBBD-7F28-4A82-9B95-728DA99E337D@cisco.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-Outbound-SMTP-Client: 10.60.140.51, ams-ppsenak-nitro2.cisco.com X-Outbound-Node: aer-core-1.cisco.com Archived-At: Subject: Re: [Lsr] "Legal" endpoint behaviors [draft-ietf-lsr-isis-srv6-extensions-06.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: Tue, 10 Mar 2020 10:09:56 -0000 Hi Acee, On 09/03/2020 14:49, Acee Lindem (acee) wrote: > Hi Peter, Chris, > > I agree that a number of IS-IS IANA registries have this level of specification. For example: > > https://www.iana.org/assignments/isis-tlv-codepoints/isis-tlv-codepoints.xhtml#isis-tlv-codepoints-22-23-25-141-222-223 above is an ISIS specific registry and all external documents just updates this protocol specific registry - e.g. the same link attribute defined in some external document has different value in ISIS, OSPF, OSPFv3, etc. SRv6 SID behaviors are different, because they are not ISIS (protocol) specific values - they apply to other protocols (OSPF, BGP-LS, ...). As such a protocol independent registry defines them and each protocol just refers to it. thanks, Peter > > Thanks, > Acee > > On 3/9/20, 8:28 AM, "Lsr on behalf of Christian Hopps" wrote: > > > > > On Mar 9, 2020, at 6:36 AM, Peter Psenak wrote: > > > > Hi Chris, > > > > On 07/03/2020 15:46, Christian Hopps wrote: > >> 1) I think we should have an IANA registry instead of just a table defined in section 10 of draft-ietf-lsr-isis-srv6-extensions-06. > >> The registry could be cross-referenced by and to "SRv6 Endpoint Behaviors" for each protocol carrying these behaviors (IS-IS, OSPFv3, ...). If/when new behaviors are added they could then update where they are supposed to be advertised in the underlying protocols. > > > > why do we need a protocol specific registry to advertise values that are defined in another protocol independent registry? I have never seen such a duplication. Looks completely redundant to me. > > You are creating some new sub TLVs (End, End.X, LAN End.X), and you are restricting and directing which externally defined behaviors (values) can be advertised in which of these TLVs. The registry would keep track of this (e.g., "Valid behaviors for sub-TLVs End, End.X, LAN End.X") > > What happens when new behaviors are defined (externally), which TLVs are they supposed to be advertised in? Either the document that defines the new behavior or a related LSR document will have to indicate where this new behavior should be advertised too. That new document would update this registry to track that. Keeping track of this stuff is what registries are for. > > Your table literally looks like a template for the initial content of a registry. :) > > Later in your IANA section you are updating other registries that bear a striking resemblance to this (e.g., what sub-TLV types are valid to advertise in what TLVs). > > >> 2) It's odd that we are referring to the section as "Legal Behaviors" in the TLV definitions, and then in the actual section using "MAY" terms and no "MUST"/"MUST NOT", but then using "Yes" and "No" in the table. > > > > a) Legal Behavior - refers to the set of values defined in the [I-D.ietf-spring-srv6-network-programming] which can be advertised in a particular TLV > > > > b) We can not use MUST in section 10, as all these TLVs are optional > > What's wrong with "If this behavior is advertised it MUST only be advertised in the TLV[s] as indicated by "Y" in the table below, and MUST NOT be advertised in the TLV[s] as indicated by "N" in the table below." or something like that. > > Thanks, > Chris. > (as WG member) > > > > c) Yes/No means whether the particular behavior is allowed in the particular END-SID TLV. > > > >> Are these suggestions or are they documenting the required behavior? > > > > these are limitations as to which behavior is allowed to be advertised in which TLV. > > thanks, > > Peter > > > >> Thanks, > >> Chris. > > > > _______________________________________________ > > 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 Tue Mar 10 03:10:39 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 7401E3A0FC8; Tue, 10 Mar 2020 03:10:37 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -9.601 X-Spam-Level: X-Spam-Status: No, score=-9.601 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIMWL_WL_MED=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, SPF_PASS=-0.001, URIBL_BLOCKED=0.001, USER_IN_DEF_DKIM_WL=-7.5] autolearn=unavailable autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=cisco.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id bRkO1ib3BLY3; Tue, 10 Mar 2020 03:10:36 -0700 (PDT) Received: from aer-iport-2.cisco.com (aer-iport-2.cisco.com [173.38.203.52]) (using TLSv1.2 with cipher DHE-RSA-SEED-SHA (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 6F3A33A0FBF; Tue, 10 Mar 2020 03:10:35 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=3144; q=dns/txt; s=iport; t=1583835035; x=1585044635; h=subject:to:cc:references:from:message-id:date: mime-version:in-reply-to:content-transfer-encoding; bh=n+B5a7bMEGNa+ucYeJv20fHG2FcUCM8G6e5V7VCNgRg=; b=EKH+vNmU0nfFQlaFaLEfbIbnjy7/FFAXReT7p+7+3GyMhDTxW4k1c+p1 N+Qgd7Yj2LtaEPF1eXOAAgYpyZnttG1K3WFmMQV3zgljBqvTx/eKvMfX3 /IdZZ3Wq7ECbBiqLCVutpLrPqdJEpqXTABv1fB5mbdSQLFJPAmMdaa7Kf A=; X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: =?us-ascii?q?A0AOAQDeZmde/xbLJq1lGwEBAQEBAQE?= =?us-ascii?q?FAQEBEQEBAwMBAQGBe4MVVSASKoQViQOHbSWbPgkBAQEOGAsMBAEBhEMCgio?= =?us-ascii?q?4EwIDAQELAQEFAQEBAgEFBG2FVgyFYwEBAQECAQEBIRU2CwULCw4KAgImAgI?= =?us-ascii?q?nMAYBDAYCAQGDIgGCWyAPqAB1gTKFSoM5gTgGgQ4qjEaBQT+BEAEnDIJhPoJ?= =?us-ascii?q?kAQEChHSCXgSXY5hFgkaCUZQSBh2BWm+MSowljniBTZosgWkigVgzGggbFTu?= =?us-ascii?q?CbFAYDY4pFxWIT4VCQAMwAo5PAQE?= X-IronPort-AV: E=Sophos;i="5.70,536,1574121600"; d="scan'208";a="24249722" Received: from aer-iport-nat.cisco.com (HELO aer-core-3.cisco.com) ([173.38.203.22]) by aer-iport-2.cisco.com with ESMTP/TLS/DHE-RSA-SEED-SHA; 10 Mar 2020 10:10:33 +0000 Received: from [10.60.140.51] (ams-ppsenak-nitro2.cisco.com [10.60.140.51]) by aer-core-3.cisco.com (8.15.2/8.15.2) with ESMTP id 02AAAXDi027738; Tue, 10 Mar 2020 10:10:33 GMT To: Christian Hopps , Peter Psenak Cc: draft-ietf-lsr-isis-srv6-extensions@ietf.org, lsr@ietf.org References: <6aaf0adf-397c-dbd8-fad2-7e73a344b2f6@cisco.com> <72F687B9-EF8C-443B-96AD-09BADD690E0C@chopps.org> From: Peter Psenak Message-ID: <596f7772-2434-a758-a049-57cb373a6b7b@cisco.com> Date: Tue, 10 Mar 2020 11:10:33 +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: <72F687B9-EF8C-443B-96AD-09BADD690E0C@chopps.org> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-Outbound-SMTP-Client: 10.60.140.51, ams-ppsenak-nitro2.cisco.com X-Outbound-Node: aer-core-3.cisco.com Archived-At: Subject: Re: [Lsr] "Legal" endpoint behaviors [draft-ietf-lsr-isis-srv6-extensions-06.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: Tue, 10 Mar 2020 10:10:38 -0000 Chris, On 09/03/2020 13:26, Christian Hopps wrote: > > >> On Mar 9, 2020, at 6:36 AM, Peter Psenak wrote: >> >> Hi Chris, >> >> On 07/03/2020 15:46, Christian Hopps wrote: >>> 1) I think we should have an IANA registry instead of just a table defined in section 10 of draft-ietf-lsr-isis-srv6-extensions-06. >>> The registry could be cross-referenced by and to "SRv6 Endpoint Behaviors" for each protocol carrying these behaviors (IS-IS, OSPFv3, ...). If/when new behaviors are added they could then update where they are supposed to be advertised in the underlying protocols. >> >> why do we need a protocol specific registry to advertise values that are defined in another protocol independent registry? I have never seen such a duplication. Looks completely redundant to me. > > You are creating some new sub TLVs (End, End.X, LAN End.X), and you are restricting and directing which externally defined behaviors (values) can be advertised in which of these TLVs. The registry would keep track of this (e.g., "Valid behaviors for sub-TLVs End, End.X, LAN End.X") > > What happens when new behaviors are defined (externally), which TLVs are they supposed to be advertised in? Either the document that defines the new behavior or a related LSR document will have to indicate where this new behavior should be advertised too. yes. > That new document would update this registry to track that. Keeping track of this stuff is what registries are for. > > Your table literally looks like a template for the initial content of a registry. :) I still do not see a need for an ISIS (or any protocol specific) registry. > > Later in your IANA section you are updating other registries that bear a striking resemblance to this (e.g., what sub-TLV types are valid to advertise in what TLVs). > >>> 2) It's odd that we are referring to the section as "Legal Behaviors" in the TLV definitions, and then in the actual section using "MAY" terms and no "MUST"/"MUST NOT", but then using "Yes" and "No" in the table. >> >> a) Legal Behavior - refers to the set of values defined in the [I-D.ietf-spring-srv6-network-programming] which can be advertised in a particular TLV >> >> b) We can not use MUST in section 10, as all these TLVs are optional > > What's wrong with "If this behavior is advertised it MUST only be advertised in the TLV[s] as indicated by "Y" in the table below, and MUST NOT be advertised in the TLV[s] as indicated by "N" in the table below." or something like that.\ sure, I can update the text as above. thanks, Peter > > Thanks, > Chris. > (as WG member) > > >> c) Yes/No means whether the particular behavior is allowed in the particular END-SID TLV. >> >>> Are these suggestions or are they documenting the required behavior? >> >> these are limitations as to which behavior is allowed to be advertised in which TLV. >> thanks, >> Peter >> >>> Thanks, >>> Chris. >> >> _______________________________________________ >> Lsr mailing list >> Lsr@ietf.org >> https://www.ietf.org/mailman/listinfo/lsr >> > > > From nobody Tue Mar 10 04:51:02 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id BA7193A1165; Tue, 10 Mar 2020 04:51:00 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.897 X-Spam-Level: X-Spam-Status: No, score=-1.897 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, SPF_HELO_NONE=0.001, SPF_NONE=0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id NEmf8yalH4Vj; Tue, 10 Mar 2020 04:50:55 -0700 (PDT) Received: from smtp.chopps.org (smtp.chopps.org [54.88.81.56]) by ietfa.amsl.com (Postfix) with ESMTP id A42483A1161; Tue, 10 Mar 2020 04:50:54 -0700 (PDT) Received: from stubbs.int.chopps.org.chopps.org (047-050-069-038.biz.spectrum.com [47.50.69.38]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by smtp.chopps.org (Postfix) with ESMTPSA id C188D60D01; Tue, 10 Mar 2020 11:50:53 +0000 (UTC) References: <6aaf0adf-397c-dbd8-fad2-7e73a344b2f6@cisco.com> <72F687B9-EF8C-443B-96AD-09BADD690E0C@chopps.org> <3D94EBBD-7F28-4A82-9B95-728DA99E337D@cisco.com> <15aac211-359f-d369-05e4-9c6413001ba7@cisco.com> User-agent: mu4e 1.3.5; emacs 26.3 From: Christian Hopps To: Peter Psenak Cc: "Acee Lindem \(acee\)" , Christian Hopps , Peter Psenak , "lsr\@ietf.org" , "draft-ietf-lsr-isis-srv6-extensions\@ietf.org" In-reply-to: <15aac211-359f-d369-05e4-9c6413001ba7@cisco.com> Date: Tue, 10 Mar 2020 07:50:52 -0400 Message-ID: MIME-Version: 1.0 Content-Type: multipart/signed; boundary="=-=-="; micalg=pgp-sha512; protocol="application/pgp-signature" Archived-At: Subject: Re: [Lsr] "Legal" endpoint behaviors [draft-ietf-lsr-isis-srv6-extensions-06.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: Tue, 10 Mar 2020 11:51:01 -0000 --=-=-= Content-Type: text/plain; format=flowed Peter Psenak writes: > Hi Acee, > > On 09/03/2020 14:49, Acee Lindem (acee) wrote: >> Hi Peter, Chris, >> >> I agree that a number of IS-IS IANA registries have this level of specification. For example: >> >> https://www.iana.org/assignments/isis-tlv-codepoints/isis-tlv-codepoints.xhtml#isis-tlv-codepoints-22-23-25-141-222-223 > > above is an ISIS specific registry and all external documents just updates this > protocol specific registry - e.g. the same link attribute defined in some > external document has different value in ISIS, OSPF, OSPFv3, etc. > > SRv6 SID behaviors are different, because they are not ISIS (protocol) specific > values - they apply to other protocols (OSPF, BGP-LS, ...). As such a protocol > independent registry defines them and each protocol just refers to it. The equivalent to these IS-IS sub-TLV registries would be to add "carried in IS-IS sub-TLV/OSPF-Sub-TLV/etc" columns to the SRv6 protocol-agnostic behavior registry. This does not seem the correct path to me as now you have various transport protocols adding columns to the protocol agnostic registry. Instead, I'm suggesting that we create protocol specific registries along-side the behavior value registry to document the protocol specific use, leaving a reference to these protocol registries in the behavior registry to link them. Registries are non-normative, and you're not usurping or duplicating the role of the SRv6 behavior value registry by tracking additional protocol specific restrictions elsewhere by using one. Registries are there to help us keep track of stuff. In all the above cases (what goes where) it also helps make sure people *have* normatively documented *somewhere* all the cases they need to when adding new values/tvls. Do you think its better to modify the SRv6 registry directly and add protocol specific columns to it? Thanks, Chris. (as WG member) > > thanks, > Peter > >> >> Thanks, >> Acee >> >> On 3/9/20, 8:28 AM, "Lsr on behalf of Christian Hopps" wrote: >> >> > On Mar 9, 2020, at 6:36 AM, Peter Psenak >> wrote: >> > >> > Hi Chris, >> > >> > On 07/03/2020 15:46, Christian Hopps wrote: >> >> 1) I think we should have an IANA registry instead of just a table defined in section 10 of draft-ietf-lsr-isis-srv6-extensions-06. >> >> The registry could be cross-referenced by and to "SRv6 Endpoint Behaviors" for each protocol carrying these behaviors (IS-IS, OSPFv3, ...). If/when new behaviors are added they could then update where they are supposed to be advertised in the underlying protocols. >> > >> > why do we need a protocol specific registry to advertise values that are defined in another protocol independent registry? I have never seen such a duplication. Looks completely redundant to me. >> You are creating some new sub TLVs (End, End.X, LAN End.X), and you >> are restricting and directing which externally defined behaviors (values) can >> be advertised in which of these TLVs. The registry would keep track of this >> (e.g., "Valid behaviors for sub-TLVs End, End.X, LAN End.X") >> What happens when new behaviors are defined (externally), which TLVs >> are they supposed to be advertised in? Either the document that defines the >> new behavior or a related LSR document will have to indicate where this new >> behavior should be advertised too. That new document would update this >> registry to track that. Keeping track of this stuff is what registries are >> for. >> Your table literally looks like a template for the initial content >> of a registry. :) >> Later in your IANA section you are updating other registries that >> bear a striking resemblance to this (e.g., what sub-TLV types are valid to >> advertise in what TLVs). >> >> 2) It's odd that we are referring to the section as "Legal >> Behaviors" in the TLV definitions, and then in the actual section using "MAY" >> terms and no "MUST"/"MUST NOT", but then using "Yes" and "No" in the table. >> > >> > a) Legal Behavior - refers to the set of values defined in the [I-D.ietf-spring-srv6-network-programming] which can be advertised in a particular TLV >> > >> > b) We can not use MUST in section 10, as all these TLVs are optional >> What's wrong with "If this behavior is advertised it MUST only be >> advertised in the TLV[s] as indicated by "Y" in the table below, and MUST NOT >> be advertised in the TLV[s] as indicated by "N" in the table below." or >> something like that. >> Thanks, >> Chris. >> (as WG member) >> > c) Yes/No means whether the particular behavior is allowed in >> the particular END-SID TLV. >> > >> >> Are these suggestions or are they documenting the required behavior? >> > >> > these are limitations as to which behavior is allowed to be advertised in which TLV. >> > thanks, >> > Peter >> > >> >> Thanks, >> >> Chris. >> > >> > _______________________________________________ >> > 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 >> >> >> >> --=-=-= Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQIzBAEBCgAdFiEEm56yH/NF+m1FHa6lLh2DDte4MCUFAl5nfxwACgkQLh2DDte4 MCWZsg//R1uSh/KRE18ARa3pQovA/Gcj8I7UoLzePs0XmmcdV3NbpvTwA6KFY7E4 G4EPDp/BgyDbgwCjYlzgJRDplMLTGFGw0+HSWEWImmFpd8Cg5Dfeb/FvswSZupta 0iRzc2hAltw8ECA4zu7DF90lrtwiU32Byvt/BW3NmSEZ1D+lwOljJhYUINDF6DMw HKVMyRzgwG8XcGxYM3OuKqkWl9vjINcd1zmy4Yfq4oJYjsFgsIfDyuHta+ZqHDrk kZ8g9kiz/2IhP1kpHcFo/RpAh0vCJg5laXAtBnnN1p8VB0u8tVwOYL0/pZvppIca i9dIimSlCYOcObvDazM6KiWvTb2rwY/cNlvaZo7Db5FgzO3YCxfYCdBSSzieZkiu 12h/hG88aOHQb7TjtiaBULrdznhu+pHKaXmYFFna1TiwFv/+a2gmpUSiwvRAnBOP hPqfTjy5c5MqLk5/4zikC+e7RCReWpYhLBchD7EALY+IQh2xxO6ga8a24oQJGqSV GiIk/eyj/frYidVIkgZ4rN4tgPgsXAMWvAGskdJR2lRsID9/SQDSMjV2mOInpZCz G/GeC9km9aoP+sUB6qcJgQjd2kV+zijLJd27wtueifuZ1cah9bnbGs7UrVYUqc+q TbOMbomquGv8Z6AmcyEGOy/yJrN7TGNvsUmBB0jpMSBsD1IEcgY= =giha -----END PGP SIGNATURE----- --=-=-=-- From nobody Tue Mar 10 07:48:20 2020 Return-Path: X-Original-To: lsr@ietfa.amsl.com Delivered-To: lsr@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 8E9E93A14AD for ; Tue, 10 Mar 2020 07:48:10 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.897 X-Spam-Level: X-Spam-Status: No, score=-1.897 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, SPF_HELO_NONE=0.001, SPF_NONE=0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id OSBbUD96rjb6 for ; Tue, 10 Mar 2020 07:48:08 -0700 (PDT) Received: from smtp.chopps.org (smtp.chopps.org [54.88.81.56]) by ietfa.amsl.com (Postfix) with ESMTP id 5BCE53A1488 for ; Tue, 10 Mar 2020 07:48:08 -0700 (PDT) Received: from stubbs.int.chopps.org.chopps.org (047-050-069-038.biz.spectrum.com [47.50.69.38]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by smtp.chopps.org (Postfix) with ESMTPSA id 6A29E60B8A; Tue, 10 Mar 2020 14:48:07 +0000 (UTC) References: <5b430357-56ad-2901-f5a8-c0678a507293@cisco.com> <4FC90EB2-D355-4DC5-8365-E5FBE037954E@gmail.com> User-agent: mu4e 1.3.5; emacs 26.3 From: Christian Hopps To: lsr@ietf.org Cc: Tony Przygienda , "tony.li\@tony.li" , Tony Li , "Peter Psenak \(ppsenak\)" In-reply-to: Date: Tue, 10 Mar 2020 10:48:05 -0400 Message-ID: MIME-Version: 1.0 Content-Type: multipart/signed; boundary="=-=-="; micalg=pgp-sha512; protocol="application/pgp-signature" 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: Tue, 10 Mar 2020 14:48:18 -0000 --=-=-= Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: quoted-printable Les Ginsberg (ginsberg) writes: > Tony =E2=80=93 > > If you have a suggestion for Tx back-off algorithm please feel free to sh= are. > The proposal in the draft is just a suggestion. > As this is a local matter there is no interoperability issue, but certain= ly documenting a better algorithm is worthwhile. [as WG member] The main thing I'm afraid of is we're just making up some new overly simple= congestion control algorithm (are there CC experts reviewing this?); maybe= simulate it a few ways, deploy it, and have it work poorly or make things = worse. In any case, damn the torpedos... In this current algorithm how does MaxLSPTx get set? What happens if MaxLSP= Tx is too high? If its too low we could be missing a much faster convergenc= e capability. What if we had more quality information from the receiver, could we do a be= tter job here? Maybe faster ACKs, or could we include a timestamp somehow t= o calculate RTT? This is the type of data that is used by existing CC algor= ithms (https://tools.ietf.org/html/rfc4342, https://tools.ietf.org/html/rfc= 5348). Of course going through these documents (which I've had to do for in= another area) can start making one think "Punt to TCP" :) What would be nice, if we're going to attempt CC, is that the algorithm wou= ld be good enough to send relatively fast to start, adjust quickly if need = be, and allow for *increasing* the send rate. The increasing part I think i= s important, if we take this work on, and I don't think it's currently cove= red. I also don't have a good feel for how quickly the current suggested algorit= hm adjusts its send rate when it needs to. The correct value for Usafe seem= s very much dependent on the receivers partialSNPInterval. It's so dependen= t that one might imagine it would be smart for the receiver to signal the v= alue to the transmitter so that the transmitter can set Usafe correctly. Thanks, Chris. [as WG member] > > 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 ; 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 spee= ds that converge LSDBs some order of magnitudes above today's speeds ;-) h= ere'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 around= the equilibrium ;-) > 2. Queue per interface is fairly trivial with modern implementation techn= iques and memory sizes if done correctly. Yes, very memory constrained plat= forms are a mildly different game and kind of precondition a different disc= ussion. > 3. RX side is possible and somewhat useful but much harder to do well dep= ending on flavor. If we're talking about the RX advertising a very static v= alue to cap the flooding speed that's actually a useful knob to have IMO/IM= E. Trying to cleverly communicate to the TXer a window size is not only fie= ndishly difficult, incurs back propagation speed (not neglectible @ those r= ates 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 backp= ressure 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 b= y looking @ some standard stats on what is productive incoming rate on the = interface. Anything smarter needs new TLVs on packets & then you have a pro= blem 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 ov= ersimplification - 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 si= gnaling needs to be sent ASAP - you cannot wait until the next periodic hel= lo interval (default 10 seconds) to expire. So you are going to have to int= roduce 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 neighbor= so that each side would know when the neighbor had received the updated in= fo. 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 no= 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, wh= ich means that additional hello traffic will occur on all interfaces. At sc= ale 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 t= hat >> 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. It would seem like an initial impl= ementation >> 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 m= ay be >> necessary, but I suspect that this is not going to become more >complica= ted >> 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 >> > >> > > > _______________________________________________ > 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 --=-=-= Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQIzBAEBCgAdFiEEm56yH/NF+m1FHa6lLh2DDte4MCUFAl5nqKUACgkQLh2DDte4 MCVRiRAAmPbFTIfokLPki2SPrU7KVQpWqmtXrVgslEbRG0iF2UE/ZNYgvPL0GPto FWhpaFcOfArup/nsZ2tzZq9uZTMaGpQVJEhp4vh6eN/25qG8pR8drVsTal/Ln79T X6VAOqIeoAQXEF8Ol9pmMA/voP+W+gb2JSxEGvIMhUJy1SD5KJ01MH4bOxc3/lSx W0vfoizfGmNxivkBDMv/D+ihRd3pcAayYnBfPab85fp88rQo/zs0HWROjHGBrIW5 zhaZZzFPEO6x0VPkPYuzDN5/LjTK9Iei3FoMVVNAcbawBqGoHCM/ug457/HfcWLQ +ZJhXq+igCpKI4AwKLY4MNuDguYUNetRQCY4Fh7IcYkkpzI7+QMtrqVZLMjitRnJ m4FPslkybBPi/N/PnaUFPbO/S9XtLGLwuKHQaoK8ZxCTbNjaRlLvfqa0f2O35Bgh uwv0qbZbrzDEl5S7QCt74pJgQr9FhFsoGRLFs7ug865sbuorJKmUYEGMlsPTqB6G AtNd6UO1xDQXcUXflhVgdnA9uE933+Ysy7s1L2Eb2LSpm777TMTbWv4bbPHDu/VX lXseVed80pgpfGeJJ5Qn4jCdLA7sLyPMAEoc3ZLpkFsm20gqdXfiqGcDyGp00Zuz 2pHRP6f2S5H7uL5yAbcKv+flrBDnj3U/4E0JmNxayyBmYuc/eGU= =I/i9 -----END PGP SIGNATURE----- --=-=-=-- From nobody Tue Mar 10 08:24:15 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 A99173A14BA for ; 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Tue, 10 Mar 2020 08:24:06 -0700 (PDT) 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: Tue, 10 Mar 2020 08:22:36 -0700 Message-ID: To: Christian Hopps Cc: lsr@ietf.org, "tony.li@tony.li" , Tony Li , "Peter Psenak (ppsenak)" Content-Type: multipart/alternative; boundary="000000000000e35bff05a081b58d" 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: Tue, 10 Mar 2020 15:24:14 -0000 --000000000000e35bff05a081b58d Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hey Christian, MaxTX is not that hard to derive since it's basically limited by the local system and its CPU/prioritization/queing architecture. For the rest of your email, in short, you have my observations in the previous email what I think is useful and can be done ... BTW, timestamps are useless unless you synchronize clocks and with all the queing that ISIS does through the system normally to get stuff done it is very hard to account for delays between packet being generated (or rx'ed on interface) and last queue it's pulled from usually. More musings below backed by good amount of work & empirical experience ;-) If we try to punt to TCP (like BGP did in its time which I argued wasn't the optimal idea that has bitten us back endless amount of times for the shortcut it was ;-) then de facto, no real heavy duty IP box is using stock TCP stack, at least in the scope of experience I have across bunch of leading vendors. If you worked on mod'ing TCP for convergence speed with BGP and cute little things like GR/NSR you will know the practical problems and also why stock TCP is actually fairly underwhelming when it comes to push large amounts of control data around (mod' distro, mod rusty 2c, mod etc but that's my data). And agreed, control theory is a wonderful thing and transfer windowing protocols etc are long research if you know where to look and lots of the stuff is e.g. present in TCP, QUIC or https://tools.ietf.org/html/rfc4340 and so on. All of them are quite a lot of stuff to put into ISIS/link-state and mostly do not do precisely what we need or precondition things we can't afford under heavy load (very fast, non slip timers which are absolutely non trivial if you're not in kernel). On top of that you'd need to drag 2 protocol transports around now with old ISIS flooding with RE-TX and and the new thing that should be doing the stuff by itself (and negotiate transport on top and so on). To give you a rought idea DDCP which is probably smallest is ~ 10KLOC of C in user space in BETA and zero docs ;-) I looked @ the practically existing stuff 2+ years ago in detail when doing RIFT ;-) and with all what I practically found I ended up carving out the pieces we need for fast flooding without introducing fast-acks which IMO would be a non-starter for high scale link-state or rather, if we really want that, the loop closes and we should go practically speaking to TCP (or 4340 which looked like a better choice to me but just like e.g. Open-R did and be done with it) or wait for the mythical QUIC all-singing-all-dancing public domain implementation maybe. For many reasons I do not think it would be a particularly good development entangling a control protocol again with a user transport in the whole ball of yarn that IP is already. kind of all I had to say, next thing ;-) --- tony On Tue, Mar 10, 2020 at 7:48 AM Christian Hopps wrote: > > Les Ginsberg (ginsberg) writes: > > > 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. > > [as WG member] > > The main thing I'm afraid of is we're just making up some new overly > simple congestion control algorithm (are there CC experts reviewing this?= ); > maybe simulate it a few ways, deploy it, and have it work poorly or make > things worse. In any case, damn the torpedos... > > In this current algorithm how does MaxLSPTx get set? What happens if > MaxLSPTx is too high? If its too low we could be missing a much faster > convergence capability. > > What if we had more quality information from the receiver, could we do a > better job here? Maybe faster ACKs, or could we include a timestamp someh= ow > to calculate RTT? This is the type of data that is used by existing CC > algorithms (https://tools.ietf.org/html/rfc4342, > https://tools.ietf.org/html/rfc5348). Of course going through these > documents (which I've had to do for in another area) can start making one > think "Punt to TCP" :) > > What would be nice, if we're going to attempt CC, is that the algorithm > would be good enough to send relatively fast to start, adjust quickly if > need be, and allow for *increasing* the send rate. The increasing part I > think is important, if we take this work on, and I don't think it's > currently covered. > > I also don't have a good feel for how quickly the current suggested > algorithm adjusts its send rate when it needs to. The correct value for > Usafe seems very much dependent on the receivers partialSNPInterval. It's > so dependent that one might imagine it would be smart for the receiver to > signal the value to the transmitter so that the transmitter can set Usafe > correctly. > > Thanks, > Chris. > [as WG member] > > > > > > > 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 > 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 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 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 > 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 by enhancing the new TLV to include information received fr= om > 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. > > > > It is true (of course) that hellos should be treated with higher > priority than other PDUs, but this does not mean that the additional hell= os > have no 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-I= S, > 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) 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. 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 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 > > _______________________________________________ > > Lsr mailing list > > Lsr@ietf.org > > https://www.ietf.org/mailman/listinfo/lsr > --000000000000e35bff05a081b58d Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hey Christian, MaxTX is not that hard to derive since= it's basically limited by the local system and its CPU/prioritization/= queing architecture.

For the rest of your ema= il, in short, you have my observations in the previous email what I think i= s useful and can be done ... BTW, timestamps are useless unless you synchro= nize clocks and with all the queing that ISIS does through the system norma= lly to get stuff done it is very hard to account for delays between packet = being generated (or rx'ed on interface) and last queue it's pulled = from usually. More musings below backed by good amount of work & empiri= cal experience ;-)

If we try to punt to TCP (l= ike BGP did in its time which I argued wasn't the optimal idea that has= bitten us back endless amount of times for the shortcut it was ;-) then de= facto, no real heavy duty IP box is using stock TCP stack, at least in the= scope of experience I have across bunch of leading vendors. If you worked = on mod'ing TCP for convergence speed with BGP and cute little things li= ke GR/NSR you will know the practical problems and also why stock TCP is ac= tually fairly underwhelming when it comes to push large amounts of control = data around (mod' distro, mod rusty 2c, mod etc but that's my data)= .

And agreed, control theory is a wonderful thing = and transfer windowing protocols etc are long research if you know where to= look and lots of the stuff is e.g. present in TCP, QUIC or https://tools.ietf.org/html/rfc4340 an= d so on. All of them are quite a lot of stuff to put into ISIS/link-state a= nd mostly do not do precisely what we need or precondition things we can= 9;t afford under heavy load (very fast, non slip timers which are absolutel= y non trivial if you're not in kernel). On top of that you'd need t= o drag 2 protocol transports around now with old ISIS flooding with RE-TX a= nd and the new thing that should be doing the stuff by itself (and negotiat= e transport on top and so on). To give you a rought idea DDCP which is prob= ably smallest is ~ 10KLOC of C in user space in BETA and zero docs ;-) I lo= oked @ the practically existing stuff 2+ years ago in detail when doing RIF= T ;-) and with all what I practically found I ended up carving out the piec= es we need for fast flooding without introducing fast-acks which IMO would = be a non-starter for high scale link-state or rather, if we really want tha= t, the loop closes and we should go practically speaking to TCP (or 4340 wh= ich looked like a better choice to me but=C2=A0 just like e.g. Open-R did a= nd be done with it) or wait for the mythical QUIC all-singing-all-dancing p= ublic domain implementation maybe. For many reasons I do not think it would= be a particularly good development entangling a control protocol again wit= h a user transport in the whole ball of yarn that IP is already.
=

kind of all I had to say, next thing ;-)
=
--- tony

On Tue, Mar 10, 2020 at 7:48 AM Christian= Hopps <chopps@chopps.org> w= rote:

Les Ginsberg (ginsberg) <ginsberg@cisco.com> writes:

> 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 cert= ainly documenting a better algorithm is worthwhile.

[as WG member]

The main thing I'm afraid of is we're just making up some new overl= y simple congestion control algorithm (are there CC experts reviewing this?= ); maybe simulate it a few ways, deploy it, and have it work poorly or make= things worse. In any case, damn the torpedos...

In this current algorithm how does MaxLSPTx get set? What happens if MaxLSP= Tx is too high? If its too low we could be missing a much faster convergenc= e capability.

What if we had more quality information from the receiver, could we do a be= tter job here? Maybe faster ACKs, or could we include a timestamp somehow t= o calculate RTT? This is the type of data that is used by existing CC algor= ithms (https://tools.ietf.org/html/rfc4342, https:/= /tools.ietf.org/html/rfc5348). Of course going through these documents = (which I've had to do for in another area) can start making one think &= quot;Punt to TCP" :)

What would be nice, if we're going to attempt CC, is that the algorithm= would be good enough to send relatively fast to start, adjust quickly if n= eed be, and allow for *increasing* the send rate. The increasing part I thi= nk is important, if we take this work on, and I don't think it's cu= rrently covered.

I also don't have a good feel for how quickly the current suggested alg= orithm adjusts its send rate when it needs to. The correct value for Usafe = seems very much dependent on the receivers partialSNPInterval. It's so = dependent that one might imagine it would be smart for the receiver to sign= al the value to the transmitter so that the transmitter can set Usafe corre= ctly.

Thanks,
Chris.
[as WG member]



>
>=C2=A0 =C2=A0 Les (claws in check =F0=9F=98=8A )
>
>
> 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 >
> Having worked for last couple of years on implementation of flooding s= peeds that converge LSDBs some order of magnitudes above today's speeds= =C2=A0 ;-) 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 te= chniques and memory sizes if done correctly. Yes, very memory constrained p= latforms are a mildly different game and kind of precondition a different d= iscussion.
> 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 s= tatic 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 n= ot only fiendishly difficult, incurs back propagation speed (not neglectibl= e @ those rates IME) but can easily lead to subtle flood starvation behavio= rs and lots of slow starts due to mixture of control loop dynamics and impl= ementation complexity of such a scheme. Though, giving the TXer some hint t= hat a backpressure is desired is however not a bad thing IME and can be der= ived failry easily without needs for checking queue sizes and so on. It'= ;s observable by looking @ some standard stats on what is productive incomi= ng rate on the interface. Anything smarter needs new TLVs on packets & = then you have a problem under/oversampling based on hellos (too low a frequ= ency) and ACKs (too bursty, too batchy) and flooded back LSPs (too unpredic= table)
>
> 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<mai= lto:ginsberg@cisco.= com>> wrote:
> Tony -
>
> Peter has a done a great job of highlighting that "single queue&q= uot; 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 th= is 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 alre= ady stressed.
>
> Given hellos are unreliable, the question of how many transmissions of= the update flow info is enough arises. You could make this more determinis= tic by enhancing the new TLV to include information received from the neigh= bor so that each side would know when the neighbor had received the updated= info. This then requires additional hellos be sent in both directions - wh= ich exacerbates the queue issues on both receiver and transmitter.
>
> It is true (of course) that hellos should be treated with higher prior= ity than other PDUs, but this does not mean that the additional hellos have= no 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. At= scale this is concerning.
>
>=C2=A0 =C2=A0 Les
>
>
>> -----Original Message-----
>> From: Peter Psenak <ppsenak@cisco.com<mailto:ppsenak@cisco.com>>
>> Sent: Wednesday, February 19, 2020 2:49 AM
>> To: Tony Li <tony1athome@gmail.com<mailto:tony1athome@gmail.com>>
>> Cc: Les Ginsberg (ginsberg) <ginsberg@cisco.com<mailto:ginsberg@cisco.com>>; tony.li@tony.li<mailto= :tony.li@tony.li&g= t;;
>> lsr@ietf.org= <mailto:lsr@ietf.org>
>> Subject: Re: [Lsr] Flow Control Discussion for IS-IS Flooding Spee= d
>>
>> 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. Tr= ying to
>> find a common value to report to IPGs across various PDs would inv= olve
>> some PD specific logic and that is the part I'm referring to a= nd I would like
>> NOT to get into.
>> >
>> >
>> > I=E2=80=99m sorry that scares you.=C2=A0 It would seem like a= n initial implementation
>> might be to take the min of the free space of the queues leading f= rom the
>> >interface to the CPU. I grant you that some additional sophist= ication 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 gen= erally
>> 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.or= g<mailto:Lsr@ietf.= org>
>> > https://www.ietf.org/mailman/listinfo/lsr=
>> >
>> >
>
> _______________________________________________
> Lsr mailing list
> Lsr@ietf.org<= mailto:Lsr@ietf.org&g= t;
> https://www.ietf.org/mailman/listinfo/lsr
> _______________________________________________
> Lsr mailing list
> Lsr@ietf.org
> https://www.ietf.org/mailman/listinfo/lsr
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10:02:28 -0700 Message-ID: To: Bruno Decraene Cc: Christian Hopps , "lsr@ietf.org" , "tony.li@tony.li" , Tony Li , "Peter Psenak (ppsenak)" Content-Type: multipart/alternative; boundary="00000000000014ef0b05a0831b06" 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: Tue, 10 Mar 2020 17:04:02 -0000 --00000000000014ef0b05a0831b06 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Tue, Mar 10, 2020 at 9:43 AM wrote: > With regards to punting to TCP, I think that TCP (stacks) enforce packet > ordering. > > i.e. if you receive packets 1, 3,4, =E2=80=A6,N, then you can only use pa= cket 1 > until you receive packet 2. In the meantime, you cannot use the (N-2) > packets that you did received. > > That seems like a regression for IS-IS which doesn=E2=80=99t requiring LS= Ps > ordering. (vs BGP). > well, TCP is a windowing protocol and they're hard and very bandwidth*delay/loss/jitter sensitive and yes, TCP is reliable transport and not unreliable like ISIS flooding is ... Having said that, insane amount of work has been done on TCP variants in all kind of stacks & flavors coming full circle from fast start to slow start to fast start again ;-) Stepping back a bit, what we have in ISIS is basically a DHT and the fastest way to synchronize that AFAIS is bittorrent transport ;-) When doing RIFT I looked @ their transport & one can learn a lot from that but it's a brave new world compared to the esteemed 10589 ;-) If one does that kind of transport well, it blows TCP perf away in good scenario but then, if we look for something 'download-open-source-and-plugin' kind except some 10 years old DCCP code you ain't gonna find anything massively hardened, small or easily pluggable into an ISIS implementation. modulo open source quic i didn't check the state off for last year or so or some secret sauce someone found or maybe some of the p2p code got modularized and documented ;-) ... > > Also, from what I=E2=80=99ve been told from BGP implementers, TCP is not = magic and > can=E2=80=99t be treated as a black box (if you want scale/performance). > that's a mild understatement if you ask me after having lived in the trenches since 1995 or so ;-) On the other hand, the work has been done often already and could be piggy-backed on but then, we buy ourselves mandatory IP addressing into ISIS transport and lots of other interesting, undesirable things TCP does since it's not a hop-by-hop transport but "something that always tries to find a way". And next thing we'll need TCP-AO so beware what you wish for ;-) --- tony --00000000000014ef0b05a0831b06 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable


=
On Tue, Mar 10, 2020 at 9:43 AM <<= a href=3D"mailto:bruno.decraene@orange.com">bruno.decraene@orange.com&g= t; wrote:

With = regards to punting to TCP, I think that TCP (stacks) enforce packet orderin= g.

i.e. = if you receive packets 1, 3,4, =E2=80=A6,N, then you can only use packet 1 = until you receive packet 2. In the meantime, you cannot use the (N-2) packets that y= ou did received.

That = seems like a regression for IS-IS which doesn=E2=80=99t requiring LSPs orde= ring. (vs BGP).


well, TCP is = a windowing protocol and they're hard and very bandwidth*delay/loss/jit= ter sensitive and yes, TCP is reliable transport and not unreliable like IS= IS flooding is ... Having said that, insane amount of work has been done on= TCP variants in all kind of stacks & flavors coming full circle from f= ast start to slow start to fast start again ;-)

Stepping back a bit, what we have in ISIS is basically a DHT and the fast= est way to synchronize that AFAIS is bittorrent transport ;-) When doing RI= FT I looked @ their transport & one can learn a lot from that but it= 9;s a brave new world compared to the esteemed 10589 ;-) If one does that k= ind of transport well, it blows TCP perf away in good scenario but then, if= we look for something 'download-open-source-and-plugin' kind excep= t some 10 years old DCCP code you ain't gonna find anything massively h= ardened, small or easily pluggable into an ISIS implementation. modulo open= source quic i didn't check the state off for last year or so or some s= ecret sauce someone found or maybe some of the p2p code got modularized and= documented ;-) ...

=C2=A0

Also,= from what I=E2=80=99ve been told from BGP implementers, TCP is not magic a= nd can=E2=80=99t be treated as a black box (if you want scale/performance).


that's a mild understatement if= you ask me after having lived in the trenches since 1995 or so ;-)=C2=A0 O= n the other hand, the work has been done often already and could be piggy-b= acked on but then, we buy ourselves mandatory IP addressing into ISIS trans= port and lots of other interesting, undesirable things TCP does since it= 9;s not a hop-by-hop transport but "something that always tries to fin= d a way". And next thing we'll need TCP-AO so beware what you wish= for ;-)

--- tony 





--00000000000014ef0b05a0831b06--


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To: Tony Przygienda 
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Subject: Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed
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> On Mar 10, 2020, at 11:22 AM, Tony Przygienda  =
wrote:
>=20
> Hey Christian, MaxTX is not that hard to derive since it's basically =
limited by the local system and its CPU/prioritization/queing =
architecture.=20

Well so the value is "Fast as you can?" then? It's a specific value =
"MaxLSPTx" in the algorithm in the document though and it doesn't say =
"fast as you can" :)

Maybe "Fast as you can" is OK, as long as we have some way to quickly =
adjust that and not keep returning to it so much that we lose more than =
we gain when the receiver has no way to handle it. This flooding traffic =
can be very bursty so taking too long to reach optimal isn't very good I =
would guess.

For the rest, I wasn't actually being serious about using TCP, and your =
points are valid. I think there's some good stuff to maybe be paid =
attention to in those TCP friendly algorithms, but they don't fit our =
needs close enough for copying. FWIW I did add the necessary on wire =
data and documentation to IPTFS (ipsecme) to actually implement the DCCP =
style congestion control, and will probably end up coding it, hopefully =
in less than 10k LOC -- I'll let you know. :)

My main reason for the mail was I do think the algorithm in the document =
can be improved, and the first and last part of my mail were some =
questions in that direction.

Thanks,
Chris.
[as wg member]

> For the rest of your email, in short, you have my observations in the =
previous email what I think is useful and can be done ... BTW, =
timestamps are useless unless you synchronize clocks and with all the =
queing that ISIS does through the system normally to get stuff done it =
is very hard to account for delays between packet being generated (or =
rx'ed on interface) and last queue it's pulled from usually. More =
musings below backed by good amount of work & empirical experience ;-)



>=20
> If we try to punt to TCP (like BGP did in its time which I argued =
wasn't the optimal idea that has bitten us back endless amount of times =
for the shortcut it was ;-) then de facto, no real heavy duty IP box is =
using stock TCP stack, at least in the scope of experience I have across =
bunch of leading vendors. If you worked on mod'ing TCP for convergence =
speed with BGP and cute little things like GR/NSR you will know the =
practical problems and also why stock TCP is actually fairly =
underwhelming when it comes to push large amounts of control data around =
(mod' distro, mod rusty 2c, mod etc but that's my data).
>=20
> And agreed, control theory is a wonderful thing and transfer windowing =
protocols etc are long research if you know where to look and lots of =
the stuff is e.g. present in TCP, QUIC or =
https://tools.ietf.org/html/rfc4340 and so on. All of them are quite a =
lot of stuff to put into ISIS/link-state and mostly do not do precisely =
what we need or precondition things we can't afford under heavy load =
(very fast, non slip timers which are absolutely non trivial if you're =
not in kernel). On top of that you'd need to drag 2 protocol transports =
around now with old ISIS flooding with RE-TX and and the new thing that =
should be doing the stuff by itself (and negotiate transport on top and =
so on). To give you a rought idea DDCP which is probably smallest is ~ =
10KLOC of C in user space in BETA and zero docs ;-) I looked @ the =
practically existing stuff 2+ years ago in detail when doing RIFT ;-) =
and with all what I practically found I ended up carving out the pieces =
we need for fast flooding without introducing fast-acks which IMO would =
be a non-starter for high scale link-state or rather, if we really want =
that, the loop closes and we should go practically speaking to TCP (or =
4340 which looked like a better choice to me but  just like e.g. Open-R =
did and be done with it) or wait for the mythical QUIC =
all-singing-all-dancing public domain implementation maybe. For many =
reasons I do not think it would be a particularly good development =
entangling a control protocol again with a user transport in the whole =
ball of yarn that IP is already.=20
>=20
> kind of all I had to say, next thing ;-)
>=20
> --- tony=20
>=20
> On Tue, Mar 10, 2020 at 7:48 AM Christian Hopps  =
wrote:
>=20
> Les Ginsberg (ginsberg)  writes:
>=20
> > 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.
>=20
> [as WG member]
>=20
> The main thing I'm afraid of is we're just making up some new overly =
simple congestion control algorithm (are there CC experts reviewing =
this?); maybe simulate it a few ways, deploy it, and have it work poorly =
or make things worse. In any case, damn the torpedos...
>=20
> In this current algorithm how does MaxLSPTx get set? What happens if =
MaxLSPTx is too high? If its too low we could be missing a much faster =
convergence capability.
>=20
> What if we had more quality information from the receiver, could we do =
a better job here? Maybe faster ACKs, or could we include a timestamp =
somehow to calculate RTT? This is the type of data that is used by =
existing CC algorithms (https://tools.ietf.org/html/rfc4342, =
https://tools.ietf.org/html/rfc5348). Of course going through these =
documents (which I've had to do for in another area) can start making =
one think "Punt to TCP" :)
>=20
> What would be nice, if we're going to attempt CC, is that the =
algorithm would be good enough to send relatively fast to start, adjust =
quickly if need be, and allow for *increasing* the send rate. The =
increasing part I think is important, if we take this work on, and I =
don't think it's currently covered.
>=20
> I also don't have a good feel for how quickly the current suggested =
algorithm adjusts its send rate when it needs to. The correct value for =
Usafe seems very much dependent on the receivers partialSNPInterval. =
It's so dependent that one might imagine it would be smart for the =
receiver to signal the value to the transmitter so that the transmitter =
can set Usafe correctly.
>=20
> Thanks,
> Chris.
> [as WG member]
>=20
>=20
>=20
> >
> >    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 =
; 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 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 to 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 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.
> >
> > 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 no 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. At 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 =
would 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 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
> >> >
> >> >
> >
> > _______________________________________________
> > 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


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From: "Les Ginsberg (ginsberg)" 
To: Christian Hopps , "Peter Psenak (ppsenak)" 
CC: "lsr@ietf.org" , "Acee Lindem (acee)" , "draft-ietf-lsr-isis-srv6-extensions@ietf.org" , Peter Psenak 
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From: Tony Przygienda 
Date: Tue, 10 Mar 2020 18:17:03 -0700
Message-ID: 
To: Christian Hopps 
Cc: lsr@ietf.org, Tony Li , Tony Li ,  "Peter Psenak (ppsenak)" 
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Archived-At: 
Subject: Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed
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well, e'thing can be improved. I found what I suggesed since Les asked
works well enough ... As they say, your mileage may vary

whatever you suggest as absolute value in MaxLPSTx will not hold up the
test of time, 10/sec was a great value in 80s ...

--- tony

On Tue, Mar 10, 2020 at 3:39 PM Christian Hopps  wrote:

>
>
> > On Mar 10, 2020, at 11:22 AM, Tony Przygienda 
> wrote:
> >
> > Hey Christian, MaxTX is not that hard to derive since it's basically
> limited by the local system and its CPU/prioritization/queing architectur=
e.
>
> Well so the value is "Fast as you can?" then? It's a specific value
> "MaxLSPTx" in the algorithm in the document though and it doesn't say "fa=
st
> as you can" :)
>
> Maybe "Fast as you can" is OK, as long as we have some way to quickly
> adjust that and not keep returning to it so much that we lose more than w=
e
> gain when the receiver has no way to handle it. This flooding traffic can
> be very bursty so taking too long to reach optimal isn't very good I woul=
d
> guess.
>
> For the rest, I wasn't actually being serious about using TCP, and your
> points are valid. I think there's some good stuff to maybe be paid
> attention to in those TCP friendly algorithms, but they don't fit our nee=
ds
> close enough for copying. FWIW I did add the necessary on wire data and
> documentation to IPTFS (ipsecme) to actually implement the DCCP style
> congestion control, and will probably end up coding it, hopefully in less
> than 10k LOC -- I'll let you know. :)
>
> My main reason for the mail was I do think the algorithm in the document
> can be improved, and the first and last part of my mail were some questio=
ns
> in that direction.
>
> Thanks,
> Chris.
> [as wg member]
>
> > For the rest of your email, in short, you have my observations in the
> previous email what I think is useful and can be done ... BTW, timestamps
> are useless unless you synchronize clocks and with all the queing that IS=
IS
> does through the system normally to get stuff done it is very hard to
> account for delays between packet being generated (or rx'ed on interface)
> and last queue it's pulled from usually. More musings below backed by goo=
d
> amount of work & empirical experience ;-)
>
>
>
> >
> > If we try to punt to TCP (like BGP did in its time which I argued wasn'=
t
> the optimal idea that has bitten us back endless amount of times for the
> shortcut it was ;-) then de facto, no real heavy duty IP box is using sto=
ck
> TCP stack, at least in the scope of experience I have across bunch of
> leading vendors. If you worked on mod'ing TCP for convergence speed with
> BGP and cute little things like GR/NSR you will know the practical proble=
ms
> and also why stock TCP is actually fairly underwhelming when it comes to
> push large amounts of control data around (mod' distro, mod rusty 2c, mod
> etc but that's my data).
> >
> > And agreed, control theory is a wonderful thing and transfer windowing
> protocols etc are long research if you know where to look and lots of the
> stuff is e.g. present in TCP, QUIC or https://tools.ietf.org/html/rfc4340
> and so on. All of them are quite a lot of stuff to put into ISIS/link-sta=
te
> and mostly do not do precisely what we need or precondition things we can=
't
> afford under heavy load (very fast, non slip timers which are absolutely
> non trivial if you're not in kernel). On top of that you'd need to drag 2
> protocol transports around now with old ISIS flooding with RE-TX and and
> the new thing that should be doing the stuff by itself (and negotiate
> transport on top and so on). To give you a rought idea DDCP which is
> probably smallest is ~ 10KLOC of C in user space in BETA and zero docs ;-=
)
> I looked @ the practically existing stuff 2+ years ago in detail when doi=
ng
> RIFT ;-) and with all what I practically found I ended up carving out the
> pieces we need for fast flooding without introducing fast-acks which IMO
> would be a non-starter for high scale link-state or rather, if we really
> want that, the loop closes and we should go practically speaking to TCP (=
or
> 4340 which looked like a better choice to me but  just like e.g. Open-R d=
id
> and be done with it) or wait for the mythical QUIC all-singing-all-dancin=
g
> public domain implementation maybe. For many reasons I do not think it
> would be a particularly good development entangling a control protocol
> again with a user transport in the whole ball of yarn that IP is already.
> >
> > kind of all I had to say, next thing ;-)
> >
> > --- tony
> >
> > On Tue, Mar 10, 2020 at 7:48 AM Christian Hopps 
> wrote:
> >
> > Les Ginsberg (ginsberg)  writes:
> >
> > > Tony =E2=80=93
> > >
> > > If you have a suggestion for Tx back-off algorithm please feel free t=
o
> 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.
> >
> > [as WG member]
> >
> > The main thing I'm afraid of is we're just making up some new overly
> simple congestion control algorithm (are there CC experts reviewing this?=
);
> maybe simulate it a few ways, deploy it, and have it work poorly or make
> things worse. In any case, damn the torpedos...
> >
> > In this current algorithm how does MaxLSPTx get set? What happens if
> MaxLSPTx is too high? If its too low we could be missing a much faster
> convergence capability.
> >
> > What if we had more quality information from the receiver, could we do =
a
> better job here? Maybe faster ACKs, or could we include a timestamp someh=
ow
> to calculate RTT? This is the type of data that is used by existing CC
> algorithms (https://tools.ietf.org/html/rfc4342,
> https://tools.ietf.org/html/rfc5348). Of course going through these
> documents (which I've had to do for in another area) can start making one
> think "Punt to TCP" :)
> >
> > What would be nice, if we're going to attempt CC, is that the algorithm
> would be good enough to send relatively fast to start, adjust quickly if
> need be, and allow for *increasing* the send rate. The increasing part I
> think is important, if we take this work on, and I don't think it's
> currently covered.
> >
> > I also don't have a good feel for how quickly the current suggested
> algorithm adjusts its send rate when it needs to. The correct value for
> Usafe seems very much dependent on the receivers partialSNPInterval. It's
> so dependent that one might imagine it would be smart for the receiver to
> signal the value to the transmitter so that the transmitter can set Usafe
> correctly.
> >
> > Thanks,
> > Chris.
> > [as WG member]
> >
> >
> >
> > >
> > >    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 ove=
r
> 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 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 a=
n
> 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 to introduce extra hello traffic at a time when protocol input queue=
s
> are already stressed.
> > >
> > > Given hellos are unreliable, the question of how many transmissions o=
f
> the update flow info is enough arises. You could make this more
> deterministic by enhancing the new TLV to include information received fr=
om
> 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.
> > >
> > > It is true (of course) that hellos should be treated with higher
> priority than other PDUs, but this does not mean that the additional hell=
os
> have no 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-I=
S,
> 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)  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 ea=
ch
> > >> architecture may have different number of queues involved, etc.
> Trying to
> > >> find a common value to report to IPGs across various PDs would invol=
ve
> > >> 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.  It would seem like an initial
> implementation
> > >> might be to take the min of the free space of the queues leading fro=
m
> 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
> > >> >
> > >> >
> > >
> > > _______________________________________________
> > > 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
>
>

--000000000000e4696505a08a03d4
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable


well, e'thing can be improved. I found what I sug=
gesed since Les asked works well enough ... As they say, your mileage may v=
ary

whatever you suggest as absolute value in MaxL=
PSTx will not hold up the test of time, 10/sec was a great value in 80s ...=
 

--- tony 

On Tue, Mar 10, 2020 at 3=
:39 PM Christian Hopps <chopps@chop=
ps.org> wrote:




> On Mar 10, 2020, at 11:22 AM, Tony Przygienda <tonysietf@gmail.com> wrote:

> 

> Hey Christian, MaxTX is not that hard to derive since it's basical=
ly limited by the local system and its CPU/prioritization/queing architectu=
re. 



Well so the value is "Fast as you can?" then? It's a specific=
 value "MaxLSPTx" in the algorithm in the document though and it =
doesn't say "fast as you can" :)



Maybe "Fast as you can" is OK, as long as we have some way to qui=
ckly adjust that and not keep returning to it so much that we lose more tha=
n we gain when the receiver has no way to handle it. This flooding traffic =
can be very bursty so taking too long to reach optimal isn't very good =
I would guess.



For the rest, I wasn't actually being serious about using TCP, and your=
 points are valid. I think there's some good stuff to maybe be paid att=
ention to in those TCP friendly algorithms, but they don't fit our need=
s close enough for copying. FWIW I did add the necessary on wire data and d=
ocumentation to IPTFS (ipsecme) to actually implement the DCCP style conges=
tion control, and will probably end up coding it, hopefully in less than 10=
k LOC -- I'll let you know. :)



My main reason for the mail was I do think the algorithm in the document ca=
n be improved, and the first and last part of my mail were some questions i=
n that direction.



Thanks,

Chris.

[as wg member]



> For the rest of your email, in short, you have my observations in the =
previous email what I think is useful and can be done ... BTW, timestamps a=
re useless unless you synchronize clocks and with all the queing that ISIS =
does through the system normally to get stuff done it is very hard to accou=
nt for delays between packet being generated (or rx'ed on interface) an=
d last queue it's pulled from usually. More musings below backed by goo=
d amount of work & empirical experience ;-)







> 

> If we try to punt to TCP (like BGP did in its time which I argued wasn=
't the optimal idea that has bitten us back endless amount of times for=
 the shortcut it was ;-) then de facto, no real heavy duty IP box is using =
stock TCP stack, at least in the scope of experience I have across bunch of=
 leading vendors. If you worked on mod'ing TCP for convergence speed wi=
th BGP and cute little things like GR/NSR you will know the practical probl=
ems and also why stock TCP is actually fairly underwhelming when it comes t=
o push large amounts of control data around (mod' distro, mod rusty 2c,=
 mod etc but that's my data).

> 

> And agreed, control theory is a wonderful thing and transfer windowing=
 protocols etc are long research if you know where to look and lots of the =
stuff is e.g. present in TCP, QUIC or https://tools.ietf.org/html=
/rfc4340 and so on. All of them are quite a lot of stuff to put into IS=
IS/link-state and mostly do not do precisely what we need or precondition t=
hings we can't afford under heavy load (very fast, non slip timers whic=
h are absolutely non trivial if you're not in kernel). On top of that y=
ou'd need to drag 2 protocol transports around now with old ISIS floodi=
ng with RE-TX and and the new thing that should be doing the stuff by itsel=
f (and negotiate transport on top and so on). To give you a rought idea DDC=
P which is probably smallest is ~ 10KLOC of C in user space in BETA and zer=
o docs ;-) I looked @ the practically existing stuff 2+ years ago in detail=
 when doing RIFT ;-) and with all what I practically found I ended up carvi=
ng out the pieces we need for fast flooding without introducing fast-acks w=
hich IMO would be a non-starter for high scale link-state or rather, if we =
really want that, the loop closes and we should go practically speaking to =
TCP (or 4340 which looked like a better choice to me but=C2=A0 just like e.=
g. Open-R did and be done with it) or wait for the mythical QUIC all-singin=
g-all-dancing public domain implementation maybe. For many reasons I do not=
 think it would be a particularly good development entangling a control pro=
tocol again with a user transport in the whole ball of yarn that IP is alre=
ady. 

> 

> kind of all I had to say, next thing ;-)

> 

> --- tony 

> 

> On Tue, Mar 10, 2020 at 7:48 AM Christian Hopps <chopps@chopps.org> wrote:

> 

> Les Ginsberg (ginsberg) <ginsberg@cisco.com> writes:

> 

> > Tony =E2=80=93

> >

> > If you have a suggestion for Tx back-off algorithm please feel fr=
ee 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.

> 

> [as WG member]

> 

> The main thing I'm afraid of is we're just making up some new =
overly simple congestion control algorithm (are there CC experts reviewing =
this?); maybe simulate it a few ways, deploy it, and have it work poorly or=
 make things worse. In any case, damn the torpedos...

> 

> In this current algorithm how does MaxLSPTx get set? What happens if M=
axLSPTx is too high? If its too low we could be missing a much faster conve=
rgence capability.

> 

> What if we had more quality information from the receiver, could we do=
 a better job here? Maybe faster ACKs, or could we include a timestamp some=
how to calculate RTT? This is the type of data that is used by existing CC =
algorithms (https://tools.ietf.org/html/rfc4342, ht=
tps://tools.ietf.org/html/rfc5348). Of course going through these docum=
ents (which I've had to do for in another area) can start making one th=
ink "Punt to TCP" :)

> 

> What would be nice, if we're going to attempt CC, is that the algo=
rithm would be good enough to send relatively fast to start, adjust quickly=
 if need be, and allow for *increasing* the send rate. The increasing part =
I think is important, if we take this work on, and I don't think it'=
;s currently covered.

> 

> I also don't have a good feel for how quickly the current suggeste=
d algorithm adjusts its send rate when it needs to. The correct value for U=
safe seems very much dependent on the receivers partialSNPInterval. It'=
s so dependent that one might imagine it would be smart for the receiver to=
 signal the value to the transmitter so that the transmitter can set Usafe =
correctly.

> 

> Thanks,

> Chris.

> [as WG member]

> 

> 

> 

> >

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

> >

> >

> > 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 Spe=
ed

> >

> > Having worked for last couple of years on implementation of flood=
ing speeds that converge LSDBs some order of magnitudes above today's s=
peeds=C2=A0 ;-) 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 ther=
e, 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 implementati=
on techniques and memory sizes if done correctly. Yes, very memory constrai=
ned platforms are a mildly different game and kind of precondition a differ=
ent 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 v=
ery static value to cap the flooding speed that's actually a useful kno=
b to have IMO/IME. Trying to cleverly communicate to the TXer a window size=
 is not only fiendishly difficult, incurs back propagation speed (not negle=
ctible @ those rates IME) but can easily lead to subtle flood starvation be=
haviors and lots of slow starts due to mixture of control loop dynamics and=
 implementation complexity of such a scheme. Though, giving the TXer some h=
int that a backpressure is desired is however not a bad thing IME and can b=
e derived failry easily without needs for checking queue sizes and so on. I=
t's observable by looking @ some standard stats on what is productive i=
ncoming rate on the interface. Anything smarter needs new TLVs on packets &=
amp; 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 unp=
redictable)

> >

> > 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&l=
t;mailto:ginsberg@c=
isco.com>> wrote:

> > Tony -

> >

> > Peter has a done a great job of highlighting that "single qu=
eue" is an oversimplification - I have nothing to add to that discussi=
on.

> >

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

> >

> > As you need to send signaling based upon dynamic receiver state a=
nd 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 peri=
odic hello interval (default 10 seconds) to expire. So you are going to hav=
e to introduce extra hello traffic at a time when protocol input queues are=
 already stressed.

> >

> > Given hellos are unreliable, the question of how many transmissio=
ns of the update flow info is enough arises. You could make this more deter=
ministic by enhancing the new TLV to include information received from the =
neighbor so that each side would know when the neighbor had received the up=
dated 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 no 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 I=
S-IS, which means that additional hello traffic will occur on all interface=
s. At scale this is concerning.

> >

> >=C2=A0 =C2=A0 Les

> >

> >

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

> >> From: Peter Psenak <ppsenak@cisco.com<mailto:ppsenak@cisco.com>>

> >> Sent: Wednesday, February 19, 2020 2:49 AM

> >> To: Tony Li <tony1athome@gmail.com<mailto:tony1athome@gmail.com>>

> >> Cc: Les Ginsberg (ginsberg) <ginsberg@cisco.com<mailto:ginsberg@cisco.com>>; tony.li@tony.li<m=
ailto:tony.li@tony.li<=
/a>>;

> >> lsr@ietf.or=
g<mailto: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 is=
sue. 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, et=
c. Trying to

> >> find a common value to report to IPGs across various PDs woul=
d 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 l=
ike an initial implementation

> >> might be to take the min of the free space of the queues lead=
ing from the

> >> >interface to the CPU. I grant you that some additional so=
phistication may be

> >> necessary, but I suspect that this is not going to become mor=
e >complicated

> >> than polynomial evaluation.

> >>

> >> I'm not scared of polynomial evaluation, but the fact tha=
t my IGP

> >> implementation is dependent on the PD specifics, which are no=
t generally

> >> available and need to be custom built for each PD specificall=
y. I always

> >> thought a good IGP implementation is PD agnostic.

> >>

> >> thanks,

> >> Peter

> >>

> >> >

> >> > Tony

> >> >

> >> > _______________________________________________

> >> > Lsr mailing list

> >> > Lsr@ie=
tf.org<mailto:Lsr@=
ietf.org>

> >> > https://www.ietf.org/mailman/listinfo/ls=
r

> >> >

> >> >

> >

> > _______________________________________________

> > Lsr mailing list

> > Lsr@ietf.org<mailto:Lsr@ietf.org<=
/a>>

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

> > _______________________________________________

> > Lsr mailing list

> > Lsr@ietf.org

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






--000000000000e4696505a08a03d4--


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From: Christian Hopps 
In-Reply-To: 
Date: Wed, 11 Mar 2020 04:24:16 -0400
Cc: Christian Hopps , "Peter Psenak (ppsenak)" , "lsr@ietf.org" , "Acee Lindem (acee)" , Peter Psenak , "draft-ietf-lsr-isis-srv6-extensions@ietf.org" 
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To: "Les Ginsberg (ginsberg)" 
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Archived-At: 
Subject: Re: [Lsr] "Legal" endpoint behaviors [draft-ietf-lsr-isis-srv6-extensions-06.txt]
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> On Mar 10, 2020, at 8:06 PM, Les Ginsberg (ginsberg) =
 wrote:
>=20
> Chris/Acee -
> =20
> I strongly agree with Peter.
> =20
> There is no point in creating a protocol specific registry for =
behavior values which are protocol agnostic.
> This only adds duplication (which is NOT the same as redundancy =F0=9F=98=
=8A ).

This was and is not my suggestion.

> What I find unfortunate is that the table in Section 10 of =
draft-ietf-lsr-isis-srv6-extensions-06.txt  has a "Behavior Endpoint =
Codepoint" column. That should be removed.

Or remove the names and just leave the values, whatever, since mapping =
names or registering values isn't the point of the table you could do =
either.

> The legal behaviors to be advertised by IS-IS are then defined by name =
in column 1.

This table isn't "the legal value to be advertised in IS-IS" it's "Which =
sub-TLV in IS-IS are allowed to advertise a given behavior value". Again =
this table looks just like other IS-IS sub-TLV registries where we list =
which values are allowed in which TLV.

To be clear here *IF* SR were an IS-IS only thing we would have a =
registry that looked like this:

** IF SR were only an IS-IS thing **

| Value | Description    | [End] | [End.X] | [LAN End.X] | Reference |
| A     | Behavior A     | Y     | N       | N           | RFC-A000  |
| B     | Behavior B     | N     | Y       | Y           | RFC-B000  |
| C     | New Behavior C | Y     | N       | N           | RFC-C000  |
| ...   | ...            |       |         |             |           |

But it's not, so we have protocol agnostic SR behaviors

** SR (protocol agnostic -- already exists) **

| Value | Name/Description | Reference   |
| A     | Behavior A       | SR-RFC-A111 |
| B     | Behavior B       | SR-RFC-B111 |
| C     | New Behavior C   | SR-RFC-C111 |
| ...   | ...              |             |
|       |                  |             |

And then we have IS-IS restrictions on where those are advertised.

** IS-IS "legal values" registry **

| Name/Description | [End] | [End.X] | [LAN End.X] | Reference    |
| Behavior A       | Y     | N       | N           | LSR-RFC-A222 |
| Behavior B       | N     | Y       | Y           | LSR-RFC-B222 |
| Behavior C       | Y     | N       | N           | LSR-RFC-C222 |
| ...              |       |         |             |              |

Name/Description or Value whatever you want in column 1 as long as it is =
always going to be unambiguous.

If you're saying this is not useful, do you perhaps also think our =
current "where to advertise" columns in our sub-TLV registries are =
useless?

>  If you want to find the numerical value(s) associated with that name =
then you refer to the registry created by =
draft-ietf-spring-srv6-network-programming.

Yes, but again, I wasn't talking about this.

Thanks,
Chris.
[as WG member]

> =20
>    Les
> =20
> =20
> > -----Original Message-----
> > From: Lsr  On Behalf Of Christian Hopps
> > Sent: Tuesday, March 10, 2020 4:51 AM
> > To: Peter Psenak (ppsenak) 
> > Cc: lsr@ietf.org; Christian Hopps ; Acee Lindem =
(acee)
> > ; draft-ietf-lsr-isis-srv6-extensions@ietf.org; =
Peter Psenak
> > 
> > Subject: Re: [Lsr] "Legal" endpoint behaviors =
[draft-ietf-lsr-isis-srv6-
> > extensions-06.txt]
> >
> >
> > Peter Psenak  writes:
> >
> > > Hi Acee,
> > >
> > > On 09/03/2020 14:49, Acee Lindem (acee) wrote:
> > >> Hi Peter, Chris,
> > >>
> > >> I agree that a number of IS-IS IANA registries have this level of
> > specification. For example:
> > >>
> > >> https://www.iana.org/assignments/isis-tlv-codepoints/isis-tlv-
> > codepoints.xhtml#isis-tlv-codepoints-22-23-25-141-222-223
> > >
> > > above is an ISIS specific registry and all external documents just =
updates
> > this
> > > protocol specific registry - e.g. the same link attribute defined =
in some
> > > external document has different value in ISIS, OSPF, OSPFv3, etc.
> > >
> > > SRv6 SID behaviors are different, because they are not ISIS =
(protocol)
> > specific
> > > values - they apply to other protocols (OSPF, BGP-LS, ...). As =
such a protocol
> > > independent registry defines them and each protocol just refers to =
it.
> >
> > The equivalent to these IS-IS sub-TLV registries would be to add =
"carried in
> > IS-IS sub-TLV/OSPF-Sub-TLV/etc" columns to the SRv6 =
protocol-agnostic
> > behavior registry. This does not seem the correct path to me as now =
you
> > have various transport protocols adding columns to the protocol =
agnostic
> > registry. Instead, I'm suggesting that we create protocol specific =
registries
> > along-side the behavior value registry to document the protocol =
specific use,
> > leaving a reference to these protocol registries in the behavior =
registry to link
> > them.
> >
> > Registries are non-normative, and you're not usurping or duplicating =
the role
> > of the SRv6 behavior value registry by tracking additional protocol =
specific
> > restrictions elsewhere by using one. Registries are there to help us =
keep
> > track of stuff. In all the above cases (what goes where) it also =
helps make
> > sure people *have* normatively documented *somewhere* all the cases
> > they need to when adding new values/tvls.
> >
> > Do you think its better to modify the SRv6 registry directly and add =
protocol
> > specific columns to it?
> >
> > Thanks,
> > Chris.
> > (as WG member)
> >
> > >
> > > thanks,
> > > Peter
> > >
> > >>
> > >> Thanks,
> > >> Acee
> > >>
> > >> On 3/9/20, 8:28 AM, "Lsr on behalf of Christian Hopps"  > bounces@ietf.org on behalf of chopps@chopps.org> wrote:
> > >>
> > >>                > On Mar 9, 2020, at 6:36 AM, Peter Psenak
> > >>  wrote:
> > >>      >
> > >>      > Hi Chris,
> > >>      >
> > >>      > On 07/03/2020 15:46, Christian Hopps wrote:
> > >>      >> 1) I think we should have an IANA registry instead of =
just a table
> > defined in section 10 of draft-ietf-lsr-isis-srv6-extensions-06.
> > >>      >> The registry could be cross-referenced by and to "SRv6 =
Endpoint
> > Behaviors" for each protocol carrying these behaviors (IS-IS, =
OSPFv3, ...).
> > If/when new behaviors are added they could then update where they =
are
> > supposed to be advertised in the underlying protocols.
> > >>      >
> > >>      > why do we need a protocol specific registry to advertise =
values that
> > are defined in another protocol independent registry? I have never =
seen
> > such a duplication. Looks completely redundant to me.
> > >>           You are creating some new sub TLVs (End, End.X, LAN =
End.X), and
> > you
> > >> are restricting and directing which externally defined behaviors =
(values)
> > can
> > >> be advertised in which of these TLVs. The registry would keep =
track of this
> > >> (e.g., "Valid behaviors for sub-TLVs End, End.X, LAN End.X")
> > >>           What happens when new behaviors are defined =
(externally), which
> > TLVs
> > >> are they supposed to be advertised in? Either the document that =
defines
> > the
> > >> new behavior or a related LSR document will have to indicate =
where this
> > new
> > >> behavior should be advertised too. That new document would update
> > this
> > >> registry to track that. Keeping track of this stuff is what =
registries are
> > >> for.
> > >>           Your table literally looks like a template for the =
initial content
> > >> of a registry. :)
> > >>           Later in your IANA section you are updating other =
registries that
> > >> bear a striking resemblance to this (e.g., what sub-TLV types are =
valid to
> > >> advertise in what TLVs).
> > >>           >> 2) It's odd that we are referring to the section as =
"Legal
> > >> Behaviors" in the TLV definitions, and then in the actual section =
using
> > "MAY"
> > >> terms and no "MUST"/"MUST NOT", but then using "Yes" and "No" in =
the
> > table.
> > >>      >
> > >>      > a) Legal Behavior - refers to the set of values defined in =
the [I-D.ietf-
> > spring-srv6-network-programming] which can be advertised in a =
particular
> > TLV
> > >>      >
> > >>      > b) We can not use MUST in section 10, as all these TLVs =
are optional
> > >>           What's wrong with "If this behavior is advertised it =
MUST only be
> > >> advertised in the TLV[s] as indicated by "Y" in the table below, =
and MUST
> > NOT
> > >> be advertised in the TLV[s] as indicated by "N" in the table =
below." or
> > >> something like that.
> > >>           Thanks,
> > >>      Chris.
> > >>      (as WG member)
> > >>                > c) Yes/No means whether the particular behavior =
is allowed in
> > >> the particular END-SID TLV.
> > >>      >
> > >>      >> Are these suggestions or are they documenting the =
required
> > behavior?
> > >>      >
> > >>      > these are limitations as to which behavior is allowed to =
be advertised
> > in which TLV.
> > >>      > thanks,
> > >>      > Peter
> > >>      >
> > >>      >> Thanks,
> > >>      >> Chris.
> > >>      >
> > >>      > _______________________________________________
> > >>      > Lsr mailing list
> > >>      > Lsr@ietf.org
> > >>      > https://www.ietf.org/mailman/listinfo/lsr
> > >>      >
> > >>           _______________________________________________
> > >>      Lsr mailing list
> > >>      Lsr@ietf.org
> > >>      https://www.ietf.org/mailman/listinfo/lsr
> > >>
> > >>
> > >>
> > >>
> =20
> _______________________________________________
> Lsr mailing list
> Lsr@ietf.org
> https://www.ietf.org/mailman/listinfo/lsr


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To: Christian Hopps 
Cc: "Acee Lindem (acee)" , Peter Psenak , "lsr@ietf.org" , "draft-ietf-lsr-isis-srv6-extensions@ietf.org" 
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Subject: Re: [Lsr] "Legal" endpoint behaviors [draft-ietf-lsr-isis-srv6-extensions-06.txt]
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On 10/03/2020 12:50, Christian Hopps wrote:
> 
> Peter Psenak  writes:
> 
>> Hi Acee,
>>
>> On 09/03/2020 14:49, Acee Lindem (acee) wrote:
>>> Hi Peter, Chris,
>>>
>>> I agree that a number of IS-IS IANA registries have this level of specification. For example:
>>>
>>> https://www.iana.org/assignments/isis-tlv-codepoints/isis-tlv-codepoints.xhtml#isis-tlv-codepoints-22-23-25-141-222-223
>>
>> above is an ISIS specific registry and all external documents just updates this
>> protocol specific registry - e.g. the same link attribute defined in some
>> external document has different value in ISIS, OSPF, OSPFv3, etc.
>>
>> SRv6 SID behaviors are different, because they are not ISIS (protocol) specific
>> values - they apply to other protocols (OSPF, BGP-LS, ...). As such a protocol
>> independent registry defines them and each protocol just refers to it.
> 
> The equivalent to these IS-IS sub-TLV registries would be to add "carried in IS-IS sub-TLV/OSPF-Sub-TLV/etc" columns to the SRv6 protocol-agnostic behavior registry. This does not seem the correct path to me as now you have various transport protocols adding columns to the protocol agnostic registry. Instead, I'm suggesting that we create protocol specific registries along-side the behavior value registry to document the protocol specific use, leaving a reference to these protocol registries in the behavior registry to link them.
> 
> Registries are non-normative, and you're not usurping or duplicating the role of the SRv6 behavior value registry by tracking additional protocol specific restrictions elsewhere by using one. Registries are there to help us keep track of stuff. In all the above cases (what goes where) it also helps make sure people *have* normatively documented *somewhere* all the cases they need to when adding new values/tvls.
> 
> Do you think its better to modify the SRv6 registry directly and add protocol specific columns to it?

no.

I believe what we have in SRv6 ISIS draft is sufficient. We are 
referring to a protocol independent registry and we specify which ISIS 
TLVs can carry which values out of that registry. I don't believe we 
need an ISIS registry to do that.

thanks,
Peter
> 
> Thanks,
> Chris.
> (as WG member)
> 
>>
>> thanks,
>> Peter
>>
>>>
>>> Thanks,
>>> Acee
>>>
>>> On 3/9/20, 8:28 AM, "Lsr on behalf of Christian Hopps"  wrote:
>>>
>>>                 > On Mar 9, 2020, at 6:36 AM, Peter Psenak
>>>  wrote:
>>>       >
>>>       > Hi Chris,
>>>       >
>>>       > On 07/03/2020 15:46, Christian Hopps wrote:
>>>       >> 1) I think we should have an IANA registry instead of just a table defined in section 10 of draft-ietf-lsr-isis-srv6-extensions-06.
>>>       >> The registry could be cross-referenced by and to "SRv6 Endpoint Behaviors" for each protocol carrying these behaviors (IS-IS, OSPFv3, ...). If/when new behaviors are added they could then update where they are supposed to be advertised in the underlying protocols.
>>>       >
>>>       > why do we need a protocol specific registry to advertise values that are defined in another protocol independent registry? I have never seen such a duplication. Looks completely redundant to me.
>>>            You are creating some new sub TLVs (End, End.X, LAN End.X), and you
>>> are restricting and directing which externally defined behaviors (values) can
>>> be advertised in which of these TLVs. The registry would keep track of this
>>> (e.g., "Valid behaviors for sub-TLVs End, End.X, LAN End.X")
>>>            What happens when new behaviors are defined (externally), which TLVs
>>> are they supposed to be advertised in? Either the document that defines the
>>> new behavior or a related LSR document will have to indicate where this new
>>> behavior should be advertised too. That new document would update this
>>> registry to track that. Keeping track of this stuff is what registries are
>>> for.
>>>            Your table literally looks like a template for the initial content
>>> of a registry. :)
>>>            Later in your IANA section you are updating other registries that
>>> bear a striking resemblance to this (e.g., what sub-TLV types are valid to
>>> advertise in what TLVs).
>>>            >> 2) It's odd that we are referring to the section as "Legal
>>> Behaviors" in the TLV definitions, and then in the actual section using "MAY"
>>> terms and no "MUST"/"MUST NOT", but then using "Yes" and "No" in the table.
>>>       >
>>>       > a) Legal Behavior - refers to the set of values defined in the [I-D.ietf-spring-srv6-network-programming] which can be advertised in a particular TLV
>>>       >
>>>       > b) We can not use MUST in section 10, as all these TLVs are optional
>>>            What's wrong with "If this behavior is advertised it MUST only be
>>> advertised in the TLV[s] as indicated by "Y" in the table below, and MUST NOT
>>> be advertised in the TLV[s] as indicated by "N" in the table below." or
>>> something like that.
>>>            Thanks,
>>>       Chris.
>>>       (as WG member)
>>>                 > c) Yes/No means whether the particular behavior is allowed in
>>> the particular END-SID TLV.
>>>       >
>>>       >> Are these suggestions or are they documenting the required behavior?
>>>       >
>>>       > these are limitations as to which behavior is allowed to be advertised in which TLV.
>>>       > thanks,
>>>       > Peter
>>>       >
>>>       >> Thanks,
>>>       >> Chris.
>>>       >
>>>       > _______________________________________________
>>>       > 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
>>>
>>>
>>>
>>>
> 
> 


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To: Christian Hopps , "Les Ginsberg (ginsberg)" 
Cc: "lsr@ietf.org" , "Acee Lindem (acee)" , "draft-ietf-lsr-isis-srv6-extensions@ietf.org" 
References:  <6aaf0adf-397c-dbd8-fad2-7e73a344b2f6@cisco.com> <72F687B9-EF8C-443B-96AD-09BADD690E0C@chopps.org> <3D94EBBD-7F28-4A82-9B95-728DA99E337D@cisco.com> <15aac211-359f-d369-05e4-9c6413001ba7@cisco.com>   <5F4F7EAC-B4AD-4BED-8AF1-9C54AE10243B@chopps.org>
From: Peter Psenak 
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Date: Wed, 11 Mar 2020 11:13:27 +0100
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Subject: Re: [Lsr] "Legal" endpoint behaviors [draft-ietf-lsr-isis-srv6-extensions-06.txt]
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On 11/03/2020 09:24, Christian Hopps wrote:
> 
> 
>> On Mar 10, 2020, at 8:06 PM, Les Ginsberg (ginsberg)  wrote:
>>
>> Chris/Acee -
>>   
>> I strongly agree with Peter.
>>   
>> There is no point in creating a protocol specific registry for behavior values which are protocol agnostic.
>> This only adds duplication (which is NOT the same as redundancy 😊 ).
> 
> This was and is not my suggestion.
> 
>> What I find unfortunate is that the table in Section 10 of draft-ietf-lsr-isis-srv6-extensions-06.txt  has a "Behavior Endpoint Codepoint" column. That should be removed.
> 
> Or remove the names and just leave the values, whatever, since mapping names or registering values isn't the point of the table you could do either.
> 
>> The legal behaviors to be advertised by IS-IS are then defined by name in column 1.
> 
> This table isn't "the legal value to be advertised in IS-IS" it's "Which sub-TLV in IS-IS are allowed to advertise a given behavior value". Again this table looks just like other IS-IS sub-TLV registries where we list which values are allowed in which TLV.
> 
> To be clear here *IF* SR were an IS-IS only thing we would have a registry that looked like this:
> 
> ** IF SR were only an IS-IS thing **
> 
> | Value | Description    | [End] | [End.X] | [LAN End.X] | Reference |
> | A     | Behavior A     | Y     | N       | N           | RFC-A000  |
> | B     | Behavior B     | N     | Y       | Y           | RFC-B000  |
> | C     | New Behavior C | Y     | N       | N           | RFC-C000  |
> | ...   | ...            |       |         |             |           |
> 
> But it's not, so we have protocol agnostic SR behaviors
> 
> ** SR (protocol agnostic -- already exists) **
> 
> | Value | Name/Description | Reference   |
> | A     | Behavior A       | SR-RFC-A111 |
> | B     | Behavior B       | SR-RFC-B111 |
> | C     | New Behavior C   | SR-RFC-C111 |
> | ...   | ...              |             |
> |       |                  |             |
> 
> And then we have IS-IS restrictions on where those are advertised.
> 
> ** IS-IS "legal values" registry **
> 
> | Name/Description | [End] | [End.X] | [LAN End.X] | Reference    |
> | Behavior A       | Y     | N       | N           | LSR-RFC-A222 |
> | Behavior B       | N     | Y       | Y           | LSR-RFC-B222 |
> | Behavior C       | Y     | N       | N           | LSR-RFC-C222 |
> | ...              |       |         |             |              |
> 
> Name/Description or Value whatever you want in column 1 as long as it is always going to be unambiguous.
> 
> If you're saying this is not useful, do you perhaps also think our current "where to advertise" columns in our sub-TLV registries are useless?

I'm not saying above is not useful, otherwise it would not be in the 
draft in a first place. What I'm saying is that we do not need a 
registry for it, it's sufficient to have a table we have, I believe.

thanks,
Peter

> 
>>   If you want to find the numerical value(s) associated with that name then you refer to the registry created by draft-ietf-spring-srv6-network-programming.
> 
> Yes, but again, I wasn't talking about this.
> 
> Thanks,
> Chris.
> [as WG member]
> 
>>   
>>     Les
>>   
>>   
>>> -----Original Message-----
>>> From: Lsr  On Behalf Of Christian Hopps
>>> Sent: Tuesday, March 10, 2020 4:51 AM
>>> To: Peter Psenak (ppsenak) 
>>> Cc: lsr@ietf.org; Christian Hopps ; Acee Lindem (acee)
>>> ; draft-ietf-lsr-isis-srv6-extensions@ietf.org; Peter Psenak
>>> 
>>> Subject: Re: [Lsr] "Legal" endpoint behaviors [draft-ietf-lsr-isis-srv6-
>>> extensions-06.txt]
>>>
>>>
>>> Peter Psenak  writes:
>>>
>>>> Hi Acee,
>>>>
>>>> On 09/03/2020 14:49, Acee Lindem (acee) wrote:
>>>>> Hi Peter, Chris,
>>>>>
>>>>> I agree that a number of IS-IS IANA registries have this level of
>>> specification. For example:
>>>>>
>>>>> https://www.iana.org/assignments/isis-tlv-codepoints/isis-tlv-
>>> codepoints.xhtml#isis-tlv-codepoints-22-23-25-141-222-223
>>>>
>>>> above is an ISIS specific registry and all external documents just updates
>>> this
>>>> protocol specific registry - e.g. the same link attribute defined in some
>>>> external document has different value in ISIS, OSPF, OSPFv3, etc.
>>>>
>>>> SRv6 SID behaviors are different, because they are not ISIS (protocol)
>>> specific
>>>> values - they apply to other protocols (OSPF, BGP-LS, ...). As such a protocol
>>>> independent registry defines them and each protocol just refers to it.
>>>
>>> The equivalent to these IS-IS sub-TLV registries would be to add "carried in
>>> IS-IS sub-TLV/OSPF-Sub-TLV/etc" columns to the SRv6 protocol-agnostic
>>> behavior registry. This does not seem the correct path to me as now you
>>> have various transport protocols adding columns to the protocol agnostic
>>> registry. Instead, I'm suggesting that we create protocol specific registries
>>> along-side the behavior value registry to document the protocol specific use,
>>> leaving a reference to these protocol registries in the behavior registry to link
>>> them.
>>>
>>> Registries are non-normative, and you're not usurping or duplicating the role
>>> of the SRv6 behavior value registry by tracking additional protocol specific
>>> restrictions elsewhere by using one. Registries are there to help us keep
>>> track of stuff. In all the above cases (what goes where) it also helps make
>>> sure people *have* normatively documented *somewhere* all the cases
>>> they need to when adding new values/tvls.
>>>
>>> Do you think its better to modify the SRv6 registry directly and add protocol
>>> specific columns to it?
>>>
>>> Thanks,
>>> Chris.
>>> (as WG member)
>>>
>>>>
>>>> thanks,
>>>> Peter
>>>>
>>>>>
>>>>> Thanks,
>>>>> Acee
>>>>>
>>>>> On 3/9/20, 8:28 AM, "Lsr on behalf of Christian Hopps" >> bounces@ietf.org on behalf of chopps@chopps.org> wrote:
>>>>>
>>>>>                 > On Mar 9, 2020, at 6:36 AM, Peter Psenak
>>>>>  wrote:
>>>>>       >
>>>>>       > Hi Chris,
>>>>>       >
>>>>>       > On 07/03/2020 15:46, Christian Hopps wrote:
>>>>>       >> 1) I think we should have an IANA registry instead of just a table
>>> defined in section 10 of draft-ietf-lsr-isis-srv6-extensions-06.
>>>>>       >> The registry could be cross-referenced by and to "SRv6 Endpoint
>>> Behaviors" for each protocol carrying these behaviors (IS-IS, OSPFv3, ...).
>>> If/when new behaviors are added they could then update where they are
>>> supposed to be advertised in the underlying protocols.
>>>>>       >
>>>>>       > why do we need a protocol specific registry to advertise values that
>>> are defined in another protocol independent registry? I have never seen
>>> such a duplication. Looks completely redundant to me.
>>>>>            You are creating some new sub TLVs (End, End.X, LAN End.X), and
>>> you
>>>>> are restricting and directing which externally defined behaviors (values)
>>> can
>>>>> be advertised in which of these TLVs. The registry would keep track of this
>>>>> (e.g., "Valid behaviors for sub-TLVs End, End.X, LAN End.X")
>>>>>            What happens when new behaviors are defined (externally), which
>>> TLVs
>>>>> are they supposed to be advertised in? Either the document that defines
>>> the
>>>>> new behavior or a related LSR document will have to indicate where this
>>> new
>>>>> behavior should be advertised too. That new document would update
>>> this
>>>>> registry to track that. Keeping track of this stuff is what registries are
>>>>> for.
>>>>>            Your table literally looks like a template for the initial content
>>>>> of a registry. :)
>>>>>            Later in your IANA section you are updating other registries that
>>>>> bear a striking resemblance to this (e.g., what sub-TLV types are valid to
>>>>> advertise in what TLVs).
>>>>>            >> 2) It's odd that we are referring to the section as "Legal
>>>>> Behaviors" in the TLV definitions, and then in the actual section using
>>> "MAY"
>>>>> terms and no "MUST"/"MUST NOT", but then using "Yes" and "No" in the
>>> table.
>>>>>       >
>>>>>       > a) Legal Behavior - refers to the set of values defined in the [I-D.ietf-
>>> spring-srv6-network-programming] which can be advertised in a particular
>>> TLV
>>>>>       >
>>>>>       > b) We can not use MUST in section 10, as all these TLVs are optional
>>>>>            What's wrong with "If this behavior is advertised it MUST only be
>>>>> advertised in the TLV[s] as indicated by "Y" in the table below, and MUST
>>> NOT
>>>>> be advertised in the TLV[s] as indicated by "N" in the table below." or
>>>>> something like that.
>>>>>            Thanks,
>>>>>       Chris.
>>>>>       (as WG member)
>>>>>                 > c) Yes/No means whether the particular behavior is allowed in
>>>>> the particular END-SID TLV.
>>>>>       >
>>>>>       >> Are these suggestions or are they documenting the required
>>> behavior?
>>>>>       >
>>>>>       > these are limitations as to which behavior is allowed to be advertised
>>> in which TLV.
>>>>>       > thanks,
>>>>>       > Peter
>>>>>       >
>>>>>       >> Thanks,
>>>>>       >> Chris.
>>>>>       >
>>>>>       > _______________________________________________
>>>>>       > 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
>>>>>
>>>>>
>>>>>
>>>>>
>>   
>> _______________________________________________
>> Lsr mailing list
>> Lsr@ietf.org
>> https://www.ietf.org/mailman/listinfo/lsr
> 
> 
> 


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From: Christian Hopps 
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Date: Wed, 11 Mar 2020 06:38:37 -0400
Cc: Christian Hopps , "Les Ginsberg (ginsberg)" , "lsr@ietf.org" , "Acee Lindem (acee)" , "draft-ietf-lsr-isis-srv6-extensions@ietf.org" 
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To: Peter Psenak 
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Archived-At: 
Subject: Re: [Lsr] "Legal" endpoint behaviors [draft-ietf-lsr-isis-srv6-extensions-06.txt]
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> On Mar 11, 2020, at 6:13 AM, Peter Psenak  wrote:
>=20
> On 11/03/2020 09:24, Christian Hopps wrote:
>>> On Mar 10, 2020, at 8:06 PM, Les Ginsberg (ginsberg) =
 wrote:
>>>=20
>>> Chris/Acee -
>>>  I strongly agree with Peter.
>>>  There is no point in creating a protocol specific registry for =
behavior values which are protocol agnostic.
>>> This only adds duplication (which is NOT the same as redundancy =F0=9F=
=98=8A ).
>> This was and is not my suggestion.
>>> What I find unfortunate is that the table in Section 10 of =
draft-ietf-lsr-isis-srv6-extensions-06.txt  has a "Behavior Endpoint =
Codepoint" column. That should be removed.
>> Or remove the names and just leave the values, whatever, since =
mapping names or registering values isn't the point of the table you =
could do either.
>>> The legal behaviors to be advertised by IS-IS are then defined by =
name in column 1.
>> This table isn't "the legal value to be advertised in IS-IS" it's =
"Which sub-TLV in IS-IS are allowed to advertise a given behavior =
value". Again this table looks just like other IS-IS sub-TLV registries =
where we list which values are allowed in which TLV.
>> To be clear here *IF* SR were an IS-IS only thing we would have a =
registry that looked like this:
>> ** IF SR were only an IS-IS thing **
>> | Value | Description    | [End] | [End.X] | [LAN End.X] | Reference =
|
>> | A     | Behavior A     | Y     | N       | N           | RFC-A000  =
|
>> | B     | Behavior B     | N     | Y       | Y           | RFC-B000  =
|
>> | C     | New Behavior C | Y     | N       | N           | RFC-C000  =
|
>> | ...   | ...            |       |         |             |           =
|
>> But it's not, so we have protocol agnostic SR behaviors
>> ** SR (protocol agnostic -- already exists) **
>> | Value | Name/Description | Reference   |
>> | A     | Behavior A       | SR-RFC-A111 |
>> | B     | Behavior B       | SR-RFC-B111 |
>> | C     | New Behavior C   | SR-RFC-C111 |
>> | ...   | ...              |             |
>> |       |                  |             |
>> And then we have IS-IS restrictions on where those are advertised.
>> ** IS-IS "legal values" registry **
>> | Name/Description | [End] | [End.X] | [LAN End.X] | Reference    |
>> | Behavior A       | Y     | N       | N           | LSR-RFC-A222 |
>> | Behavior B       | N     | Y       | Y           | LSR-RFC-B222 |
>> | Behavior C       | Y     | N       | N           | LSR-RFC-C222 |
>> | ...              |       |         |             |              |
>> Name/Description or Value whatever you want in column 1 as long as it =
is always going to be unambiguous.
>> If you're saying this is not useful, do you perhaps also think our =
current "where to advertise" columns in our sub-TLV registries are =
useless?
>=20
> I'm not saying above is not useful, otherwise it would not be in the =
draft in a first place. What I'm saying is that we do not need a =
registry for it, it's sufficient to have a table we have, I believe.

Do you think we should get rid of the "used in" columns in the IS-IS TLV =
and sub-TLV registries? The documents that define those TLVs and =
sub-TLVs already indicate which PDUs and TLVs they go in, so why do we =
need that info in the registry?

Thanks,
Chris.
[as WG member]

>=20
> thanks,
> Peter
>=20
>>>  If you want to find the numerical value(s) associated with that =
name then you refer to the registry created by =
draft-ietf-spring-srv6-network-programming.
>> Yes, but again, I wasn't talking about this.
>> Thanks,
>> Chris.
>> [as WG member]
>>>      Les
>>>   =20
>>>> -----Original Message-----
>>>> From: Lsr  On Behalf Of Christian Hopps
>>>> Sent: Tuesday, March 10, 2020 4:51 AM
>>>> To: Peter Psenak (ppsenak) 
>>>> Cc: lsr@ietf.org; Christian Hopps ; Acee Lindem =
(acee)
>>>> ; draft-ietf-lsr-isis-srv6-extensions@ietf.org; =
Peter Psenak
>>>> 
>>>> Subject: Re: [Lsr] "Legal" endpoint behaviors =
[draft-ietf-lsr-isis-srv6-
>>>> extensions-06.txt]
>>>>=20
>>>>=20
>>>> Peter Psenak  writes:
>>>>=20
>>>>> Hi Acee,
>>>>>=20
>>>>> On 09/03/2020 14:49, Acee Lindem (acee) wrote:
>>>>>> Hi Peter, Chris,
>>>>>>=20
>>>>>> I agree that a number of IS-IS IANA registries have this level of
>>>> specification. For example:
>>>>>>=20
>>>>>> https://www.iana.org/assignments/isis-tlv-codepoints/isis-tlv-
>>>> codepoints.xhtml#isis-tlv-codepoints-22-23-25-141-222-223
>>>>>=20
>>>>> above is an ISIS specific registry and all external documents just =
updates
>>>> this
>>>>> protocol specific registry - e.g. the same link attribute defined =
in some
>>>>> external document has different value in ISIS, OSPF, OSPFv3, etc.
>>>>>=20
>>>>> SRv6 SID behaviors are different, because they are not ISIS =
(protocol)
>>>> specific
>>>>> values - they apply to other protocols (OSPF, BGP-LS, ...). As =
such a protocol
>>>>> independent registry defines them and each protocol just refers to =
it.
>>>>=20
>>>> The equivalent to these IS-IS sub-TLV registries would be to add =
"carried in
>>>> IS-IS sub-TLV/OSPF-Sub-TLV/etc" columns to the SRv6 =
protocol-agnostic
>>>> behavior registry. This does not seem the correct path to me as now =
you
>>>> have various transport protocols adding columns to the protocol =
agnostic
>>>> registry. Instead, I'm suggesting that we create protocol specific =
registries
>>>> along-side the behavior value registry to document the protocol =
specific use,
>>>> leaving a reference to these protocol registries in the behavior =
registry to link
>>>> them.
>>>>=20
>>>> Registries are non-normative, and you're not usurping or =
duplicating the role
>>>> of the SRv6 behavior value registry by tracking additional protocol =
specific
>>>> restrictions elsewhere by using one. Registries are there to help =
us keep
>>>> track of stuff. In all the above cases (what goes where) it also =
helps make
>>>> sure people *have* normatively documented *somewhere* all the cases
>>>> they need to when adding new values/tvls.
>>>>=20
>>>> Do you think its better to modify the SRv6 registry directly and =
add protocol
>>>> specific columns to it?
>>>>=20
>>>> Thanks,
>>>> Chris.
>>>> (as WG member)
>>>>=20
>>>>>=20
>>>>> thanks,
>>>>> Peter
>>>>>=20
>>>>>>=20
>>>>>> Thanks,
>>>>>> Acee
>>>>>>=20
>>>>>> On 3/9/20, 8:28 AM, "Lsr on behalf of Christian Hopps" >>> bounces@ietf.org on behalf of chopps@chopps.org> wrote:
>>>>>>=20
>>>>>>                > On Mar 9, 2020, at 6:36 AM, Peter Psenak
>>>>>>  wrote:
>>>>>>      >
>>>>>>      > Hi Chris,
>>>>>>      >
>>>>>>      > On 07/03/2020 15:46, Christian Hopps wrote:
>>>>>>      >> 1) I think we should have an IANA registry instead of =
just a table
>>>> defined in section 10 of draft-ietf-lsr-isis-srv6-extensions-06.
>>>>>>      >> The registry could be cross-referenced by and to "SRv6 =
Endpoint
>>>> Behaviors" for each protocol carrying these behaviors (IS-IS, =
OSPFv3, ...).
>>>> If/when new behaviors are added they could then update where they =
are
>>>> supposed to be advertised in the underlying protocols.
>>>>>>      >
>>>>>>      > why do we need a protocol specific registry to advertise =
values that
>>>> are defined in another protocol independent registry? I have never =
seen
>>>> such a duplication. Looks completely redundant to me.
>>>>>>           You are creating some new sub TLVs (End, End.X, LAN =
End.X), and
>>>> you
>>>>>> are restricting and directing which externally defined behaviors =
(values)
>>>> can
>>>>>> be advertised in which of these TLVs. The registry would keep =
track of this
>>>>>> (e.g., "Valid behaviors for sub-TLVs End, End.X, LAN End.X")
>>>>>>           What happens when new behaviors are defined =
(externally), which
>>>> TLVs
>>>>>> are they supposed to be advertised in? Either the document that =
defines
>>>> the
>>>>>> new behavior or a related LSR document will have to indicate =
where this
>>>> new
>>>>>> behavior should be advertised too. That new document would update
>>>> this
>>>>>> registry to track that. Keeping track of this stuff is what =
registries are
>>>>>> for.
>>>>>>           Your table literally looks like a template for the =
initial content
>>>>>> of a registry. :)
>>>>>>           Later in your IANA section you are updating other =
registries that
>>>>>> bear a striking resemblance to this (e.g., what sub-TLV types are =
valid to
>>>>>> advertise in what TLVs).
>>>>>>           >> 2) It's odd that we are referring to the section as =
"Legal
>>>>>> Behaviors" in the TLV definitions, and then in the actual section =
using
>>>> "MAY"
>>>>>> terms and no "MUST"/"MUST NOT", but then using "Yes" and "No" in =
the
>>>> table.
>>>>>>      >
>>>>>>      > a) Legal Behavior - refers to the set of values defined in =
the [I-D.ietf-
>>>> spring-srv6-network-programming] which can be advertised in a =
particular
>>>> TLV
>>>>>>      >
>>>>>>      > b) We can not use MUST in section 10, as all these TLVs =
are optional
>>>>>>           What's wrong with "If this behavior is advertised it =
MUST only be
>>>>>> advertised in the TLV[s] as indicated by "Y" in the table below, =
and MUST
>>>> NOT
>>>>>> be advertised in the TLV[s] as indicated by "N" in the table =
below." or
>>>>>> something like that.
>>>>>>           Thanks,
>>>>>>      Chris.
>>>>>>      (as WG member)
>>>>>>                > c) Yes/No means whether the particular behavior =
is allowed in
>>>>>> the particular END-SID TLV.
>>>>>>      >
>>>>>>      >> Are these suggestions or are they documenting the =
required
>>>> behavior?
>>>>>>      >
>>>>>>      > these are limitations as to which behavior is allowed to =
be advertised
>>>> in which TLV.
>>>>>>      > thanks,
>>>>>>      > Peter
>>>>>>      >
>>>>>>      >> Thanks,
>>>>>>      >> Chris.
>>>>>>      >
>>>>>>      > _______________________________________________
>>>>>>      > Lsr mailing list
>>>>>>      > Lsr@ietf.org
>>>>>>      > https://www.ietf.org/mailman/listinfo/lsr
>>>>>>      >
>>>>>>           _______________________________________________
>>>>>>      Lsr mailing list
>>>>>>      Lsr@ietf.org
>>>>>>      https://www.ietf.org/mailman/listinfo/lsr
>>>>>>=20
>>>>>>=20
>>>>>>=20
>>>>>>=20
>>>  _______________________________________________
>>> Lsr mailing list
>>> Lsr@ietf.org
>>> https://www.ietf.org/mailman/listinfo/lsr


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From: "Aijun Wang" 
To: "'Sergey SHpenkov'" , 
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Subject: [Lsr] =?utf-8?b?562U5aSNOiAgUXVlc3Rpb24gYWJvdXQgT1NQRiAodHJhbnNp?= =?utf-8?q?t_area_routing_loop=29?=
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Hi, Sergey:

=20

If so, ABR-3 should also receive this SumLSA-4 for the ASBR(with cost =
300), and then prefer the path via ABR-2 to reach ASBR(with cost 20).

Then there will be no loop then?

=20

Or, how many SumLAS-4 will be advertised by ABR-1? If it selects and =
advertises only one (3 or 300), then the loop will not be emerged.=20

Currently, it seems it advertises this SumLAS-4 with the cost 300 to =
RT_1 and with the cost 3 to ABR-3?

=20

=20

Best Regards.

=20

Aijun Wang

China Telecom

=20

=E5=8F=91=E4=BB=B6=E4=BA=BA: lsr-bounces@ietf.org =
[mailto:lsr-bounces@ietf.org] =E4=BB=A3=E8=A1=A8 Sergey SHpenkov
=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2020=E5=B9=B42=E6=9C=8826=E6=97=A5 =
15:20
=E6=94=B6=E4=BB=B6=E4=BA=BA: lsr@ietf.org
=E4=B8=BB=E9=A2=98: Re: [Lsr] Question about OSPF (transit area routing =
loop)

=20

Acee,

=20

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

=20

Thanks,

Sergey

=20

=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,=20

I don=E2=80=99t see why RT_1 wouldn=E2=80=99t go through ABR_1 to get to =
the ASBR.=20

Thanks,

Acee

=20

From: Lsr  on behalf of Sergey SHpenkov =

Date: Tuesday, February 25, 2020 at 2:38 PM
To: "lsr@ietf..org  " 
Subject: [Lsr] Question about OSPF (transit area routing loop)

=20

Hi,

In section 16.3 of the OSPF RFC 2328 standard, it is stated that all ABR =
routers=20

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

=20


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Hi, Sergey:
 
If so, ABR-3 should also receive this SumLSA-4 for the ASBR(with cost =
300), and then prefer the path via ABR-2 to reach ASBR(with cost =
20).
Then there will be no loop then?
 
Or, how many SumLAS-4 will be advertised by ABR-1? If it selects and =
advertises only one (3 or 300), then the loop will not be emerged. =

Currently, it seems it advertises this SumLAS-4 with the cost 300 to =
RT_1 and with the cost 3 to ABR-3?
 
 
Best Regards.
 
Aijun Wang
China Telecom
 
=E5=8F=91=E4=BB=B6=E4=BA=BA: lsr-bounces@ietf.org =
[mailto:lsr-bounces@ietf.org] =E4=BB=A3=E8=A1=A8 Sergey =
SHpenkov
=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2020=E5=B9=B42=E6=9C=8826=E6=97=A5 15:20
=E6=94=B6=E4=BB=B6=E4=BA=BA: =
lsr@ietf.org
=E4=B8=BB=E9=A2=98: 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, Acee Lindem (acee) =
<acee@cisco.com>:<=
/p>
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 <lsr-bounces@ietf.org> on behalf of Sergey =
SHpenkov <sergey.v.shpenkov@gmail.com>
Date: =
Tuesday, February 25, 2020 at 2:38 PM
To: "lsr@ietf..org" =
<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
 

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From: Christian Hopps 
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Date: Wed, 11 Mar 2020 11:52:27 -0400
Cc: Christian Hopps , "Peter Psenak (ppsenak)" , "lsr@ietf.org" , "Acee Lindem (acee)" , "draft-ietf-lsr-isis-srv6-extensions@ietf.org" 
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To: "Les Ginsberg (ginsberg)" 
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Subject: Re: [Lsr] "Legal" endpoint behaviors [draft-ietf-lsr-isis-srv6-extensions-06.txt]
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> On Mar 11, 2020, at 10:38 AM, Les Ginsberg (ginsberg) =
 wrote:
>=20
> Chris -
>=20
>=20
>>=20
>> Do you think we should get rid of the "used in" columns in the IS-IS =
TLV and
>> sub-TLV registries? The documents that define those TLVs and sub-TLVs
>> already indicate which PDUs and TLVs they go in, so why do we need =
that
>> info in the registry?
>>=20
> [Les:] The difference for me is that the definition of sub-TLVs =
associated with the related set of TLVs is scattered across multiple =
RFCs. The additional information in the registry allows us to find this =
information in one place.
> Here, there is only one relevant IS-IS draft on this technology =
(SRv6). If the set of behaviors which can be advertised in IS-IS =
changes, then an additional IS-IS document (or a bis) will be written - =
and it likely would be required for other reasons.
>=20
> We still may not agree - but I hope we at least understand each other =
better.

Is the SR network programming document expected to respin a -bis for =
adding a behavior?

Anyway, unless someone else thinks this is important, I guess we can =
just revisit it when the next SR End behavior gets added and we're faced =
with re-spinning this document, the OSPF companion document, and =
whatever other protocols support documents for advertising the new =
behavior, in order to support it (rather than e.g., it just going =
directly in a base document or a combined protocols document and =
updating a couple registries).

Thanks,
Chris.
[as WG member]

>   Les
>=20
> _______________________________________________
> Lsr mailing list
> Lsr@ietf.org
> https://www.ietf.org/mailman/listinfo/lsr
>=20


From nobody Wed Mar 11 10:41:47 2020
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To: Christian Hopps , "Les Ginsberg (ginsberg)" 
Cc: "lsr@ietf.org" , "Acee Lindem (acee)" , "draft-ietf-lsr-isis-srv6-extensions@ietf.org" , "Peter Psenak (ppsenak)" 
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From: "Joel M. Halpern" 
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Date: Wed, 11 Mar 2020 13:41:41 -0400
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Subject: Re: [Lsr] "Legal" endpoint behaviors [draft-ietf-lsr-isis-srv6-extensions-06.txt]
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It does seem to me that using a registry to capture the relationship 
between the OSPF or IS-IS advertisement (TLV, sub-TLV, ...) and the SR 
behavior (as defined in the NP registry and subsequent additions) is 
useful.  I would not want to have to respin the base draft to add 
additional behaviors.  We use registries for a reason.

Now, if the advertisement registry has a note column, we could use that 
to record the information.  As far as I know the current registries are 
not well-structured for such auxiliary information.

Yours,
Joel

On 3/11/2020 11:52 AM, Christian Hopps wrote:
> 
> 
>> On Mar 11, 2020, at 10:38 AM, Les Ginsberg (ginsberg)  wrote:
>>
>> Chris -
>>
>>
>>>
>>> Do you think we should get rid of the "used in" columns in the IS-IS TLV and
>>> sub-TLV registries? The documents that define those TLVs and sub-TLVs
>>> already indicate which PDUs and TLVs they go in, so why do we need that
>>> info in the registry?
>>>
>> [Les:] The difference for me is that the definition of sub-TLVs associated with the related set of TLVs is scattered across multiple RFCs. The additional information in the registry allows us to find this information in one place.
>> Here, there is only one relevant IS-IS draft on this technology (SRv6). If the set of behaviors which can be advertised in IS-IS changes, then an additional IS-IS document (or a bis) will be written - and it likely would be required for other reasons.
>>
>> We still may not agree - but I hope we at least understand each other better.
> 
> Is the SR network programming document expected to respin a -bis for adding a behavior?
> 
> Anyway, unless someone else thinks this is important, I guess we can just revisit it when the next SR End behavior gets added and we're faced with re-spinning this document, the OSPF companion document, and whatever other protocols support documents for advertising the new behavior, in order to support it (rather than e.g., it just going directly in a base document or a combined protocols document and updating a couple registries).
> 
> Thanks,
> Chris.
> [as WG member]
> 
>>    Les
>>
>> _______________________________________________
>> 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
> 


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From: "Acee Lindem (acee)" 
To: "Joel M. Halpern" , Christian Hopps , "Les Ginsberg (ginsberg)" 
CC: "lsr@ietf.org" , "draft-ietf-lsr-isis-srv6-extensions@ietf.org" , "Peter Psenak (ppsenak)" 
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From: Sergey SHpenkov 
Date: Wed, 11 Mar 2020 23:31:24 +0300
Message-ID: 
To: Aijun Wang 
Cc: lsr@ietf.org
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Archived-At: 
Subject: Re: [Lsr] Question about OSPF (transit area routing loop)
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Hi Aijun,


=D1=81=D1=80, 11 =D0=BC=D0=B0=D1=80. 2020 =D0=B3. =D0=B2 13:46, Aijun Wang =
:

> Hi, Sergey:
>
>
>
> If so, ABR-3 should also receive this SumLSA-4 for the ASBR(with cost
> 300), and then prefer the path via ABR-2 to reach ASBR(with cost 20).
>
> Then there will be no loop then?
>
>
no, because sumLSA-4 in step 16.3 will be less preferred for ABR_3 than
previously calculated using the Dijkstra algorithm (with cost 3)

>
>
> Or, how many SumLAS-4 will be advertised by ABR-1? If it selects and
> advertises only one (3 or 300), then the loop will not be emerged.
>
> Currently, it seems it advertises this SumLAS-4 with the cost 300 to RT_1
> and with the cost 3 to ABR-3?
>
>
>
only one with a cost of 300

>
>
> Best Regards.
>
>
>
> Aijun Wang
>
> China Telecom
>
>
>
> *=E5=8F=91=E4=BB=B6=E4=BA=BA:* lsr-bounces@ietf.org [mailto:lsr-bounces@i=
etf.org] *=E4=BB=A3=E8=A1=A8 *Sergey
> SHpenkov
> *=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4:* 2020=E5=B9=B42=E6=9C=8826=E6=97=
=A5 15:20
> *=E6=94=B6=E4=BB=B6=E4=BA=BA:* lsr@ietf.org
> *=E4=B8=BB=E9=A2=98:* 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
>
>
>
>

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Hi Aijun,

=

=D1=81=
=D1=80, 11 =D0=BC=D0=B0=D1=80. 2020 =D0=B3. =D0=B2 13:46, Aijun Wang <wangaijun@tsinghua.org.cn>=
;:
Hi, Sergey:<=
/u>
=C2=A0
If so, ABR-3 should also rece=
ive this SumLSA-4 for the ASBR(with cost 300), and then prefer the path via=
 ABR-2 to reach ASBR(with cost 20).
Then there will be=
 no loop then?

no, because sumLSA-4 in step 16.3 will be less pr=
eferred for ABR_3 than previously calculated using the Dijkstra algorithm (=
with cost 3) 
<=
p class=3D"MsoNormal">=C2=
=A0
Or, how many SumLAS-4 will be advertised by ABR-1? If it =
selects and advertises only one (3 or 300), then the loop will not be emerg=
ed. 
Currently, it seems it advertises this SumLAS-4 w=
ith the cost 300 to RT_1 and with the cost 3 to ABR-3?=

=C2=A0

only one with a cost of 300=C2=A0


=C2=A0
Best Regards.=

=C2=A0
=

Aijun Wang
China Telecom
=C2=A0
=E5=8F=91=E4=BB=B6=E4=BA=BA: lsr-bounces=
@ietf.org [mailto:lsr-bounces@ietf.org] =E4=
=BB=A3=E8=A1=A8 Se=
rgey SHpenkov
=E5=8F=91=E9=80=
=81=E6=97=B6=E9=97=B4: 2020=
=E5=B9=B42=E6=9C=8826=E6=97=A5 15:20
=E6=94=B6=E4=BB=B6=E4=
=BA=BA: lsr@ietf.org
=E4=B8=BB=
=E9=A2=98: Re: [Lsr] Q=
uestion about OSPF (transit area routing loop)<=
/p>
=C2=A0
Acee,=

=C2=A0
Because ABR_1 creates SumLSA-4 for the ASBR not from the ba=
ckbone area.=C2=A0The cost of SumLSA-4 for ASBR is 300.
=C2=A0
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>:<=
/u>
Hi S=
ergey, 
I don=E2=80=99t see why RT_1 wouldn=E2=80=99t go through ABR_1 to get to t=
he ASBR. 
Thanks,
Acee
=C2=A0
From: Lsr <lsr-bounces@ietf.org> on behalf of Sergey SHpenkov <sergey.v.shpenkov@gma=
il.com>
Date: Tuesday, February 25, 2020 at 2:38 PM
=
To: "lsr@ietf..o=
rg" <lsr@ietf=
.org>
Subject: [Lsr] Question about OSPF (transit area rou=
ting loop)
<=
p class=3D"MsoNormal" style=3D"margin-left:36pt">=C2=
=A0
Hi,
In section 16.3 of the OSPF RFC 2328 standard, it is stated that al=
l ABR routers 
connected to a transit area a=
re required to check the sumLSA contained within
this area in order to possibly improve the intra-area and inter-area b=
ackbone routes
for themselves.=


See the picture:

The RT_1 and ABR_3 route=
rs will use different paths to the ASBR router:

ABR_3 -> RT_1 -&g=
t; 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: "Aijun Wang" 
To: "'Sergey SHpenkov'" 
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Subject: [Lsr] =?utf-8?b?562U5aSNOiAgUXVlc3Rpb24gYWJvdXQgT1NQRiAodHJhbnNp?= =?utf-8?q?t_area_routing_loop=29?=
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Hi, Sergey:

=20

ABR-1 advertised the less optimal route information to other routers(in =
virtual link environment, for avoiding other possible loop scenario, =
mentioned in G.2 of RFC 2328 as pointed out by Acee), then the other =
end(ABR-3) of the virtual link should also prefer this less optimal =
route information.

This is similar to your proposal at =
https://mailarchive.ietf.org/arch/browse/lsr/?gbt=3D1 =
 &index=3DrPZK_euJTkK0TcRhnI-l1sehxRA

=20

On the other hand, is it necessary to build another virtual link between =
 ABR-2 and ABR-3 in your topology, or else the traffic between ASBR and =
ABR-3 will be unidirectional? (ASBR can reach the ABR-3, but ABR-3 =
can=E2=80=99t reach the ASBR?)

=20

=20

Best Regards.

=20

Aijun Wang

China Telecom=20

=20

=E5=8F=91=E4=BB=B6=E4=BA=BA: lsr-bounces@ietf.org =
[mailto:lsr-bounces@ietf.org] =E4=BB=A3=E8=A1=A8 Sergey SHpenkov
=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2020=E5=B9=B43=E6=9C=8812=E6=97=A5 =
4:31
=E6=94=B6=E4=BB=B6=E4=BA=BA: Aijun Wang
=E6=8A=84=E9=80=81: lsr@ietf.org
=E4=B8=BB=E9=A2=98: Re: [Lsr] Question about OSPF (transit area routing =
loop)

=20

Hi Aijun,

=20

=20

=D1=81=D1=80, 11 =D0=BC=D0=B0=D1=80. 2020 =D0=B3. =D0=B2 13:46, Aijun =
Wang :

Hi, Sergey:

=20

If so, ABR-3 should also receive this SumLSA-4 for the ASBR(with cost =
300), and then prefer the path via ABR-2 to reach ASBR(with cost 20).

Then there will be no loop then?

=20

no, because sumLSA-4 in step 16.3 will be less preferred for ABR_3 than =
previously calculated using the Dijkstra algorithm (with cost 3)=20

=20

Or, how many SumLAS-4 will be advertised by ABR-1? If it selects and =
advertises only one (3 or 300), then the loop will not be emerged.=20

Currently, it seems it advertises this SumLAS-4 with the cost 300 to =
RT_1 and with the cost 3 to ABR-3?

=20

only one with a cost of 300 =20

=20

Best Regards.

=20

Aijun Wang

China Telecom

=20

=E5=8F=91=E4=BB=B6=E4=BA=BA: lsr-bounces@ietf.org =
[mailto:lsr-bounces@ietf.org] =E4=BB=A3=E8=A1=A8 Sergey SHpenkov
=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2020=E5=B9=B42=E6=9C=8826=E6=97=A5 =
15:20
=E6=94=B6=E4=BB=B6=E4=BA=BA: lsr@ietf.org
=E4=B8=BB=E9=A2=98: Re: [Lsr] Question about OSPF (transit area routing =
loop)

=20

Acee,

=20

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

=20

Thanks,

Sergey

=20

=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,=20

I don=E2=80=99t see why RT_1 wouldn=E2=80=99t go through ABR_1 to get to =
the ASBR.=20

Thanks,

Acee

=20

From: Lsr  on behalf of Sergey SHpenkov =

Date: Tuesday, February 25, 2020 at 2:38 PM
To: "lsr@ietf..org  "  >
Subject: [Lsr] Question about OSPF (transit area routing loop)

=20

Hi,

In section 16.3 of the OSPF RFC 2328 standard, it is stated that all ABR =
routers=20

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

=20


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Hi, Sergey:
 
ABR-1 advertised the less optimal route information to other =
routers(in virtual link environment, for avoiding other possible loop =
scenario, mentioned in G.2 of RFC 2328 as pointed out by Acee), then the =
other end(ABR-3) of the virtual link should also prefer this less =
optimal route information.
This is similar to your proposal at https://mailarchive.ietf.org/arch/browse/lsr=
/?gbt=3D1&index=3DrPZK_euJTkK0TcRhnI-l1sehxRA
 
On the other hand, is it necessary to build another virtual link =
between =C2=A0ABR-2 and ABR-3 in your topology, or else the traffic =
between ASBR and ABR-3 will be unidirectional? (ASBR can reach the =
ABR-3, but ABR-3 can=E2=80=99t reach the ASBR?)
 
 
Best Regards.
 
Aijun Wang
China Telecom 
 
=E5=8F=91=E4=BB=B6=E4=BA=BA: lsr-bounces@ietf.org =
[mailto:lsr-bounces@ietf.org] =E4=BB=A3=E8=A1=A8 Sergey =
SHpenkov
=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2020=E5=B9=B43=E6=9C=8812=E6=97=A5 4:31
=E6=94=B6=E4=BB=B6=E4=BA=BA: Aijun =
Wang
=E6=8A=84=E9=80=81: lsr@ietf.org
=E4=B8=BB=E9=A2=98: Re: [Lsr] Question about =
OSPF (transit area routing loop)
 
Hi =
Aijun,
 
 
=D1=81=D1=80, 11 =
=D0=BC=D0=B0=D1=80. 2020 =D0=B3. =D0=B2 13:46, Aijun Wang <wangaijun@tsinghua.org.cn&g=
t;:
Hi, Sergey:
 
If so, ABR-3 should also receive this SumLSA-4 for the ASBR(with cost =
300), and then prefer the path via ABR-2 to reach ASBR(with cost =
20).
Then there will be no loop then?
 
no, because sumLSA-4 in step 16.3 =
will be less preferred for ABR_3 than previously calculated using the =
Dijkstra algorithm (with cost 3) 
 
Or, how many SumLAS-4 will be advertised by ABR-1? If it selects and =
advertises only one (3 or 300), then the loop will not be emerged. =

Currently, it seems it advertises this SumLAS-4 with the cost 300 to =
RT_1 and with the cost 3 to ABR-3?
 
only one with a =
cost of 300  =

 
Best Regards.
 
Aijun Wang
China Telecom
 
=E5=8F=91=E4=BB=B6=E4=BA=BA: lsr-bounces@ietf.org [mailto:lsr-bounces@ietf.org] =E4=BB=A3=E8=A1=A8 Sergey =
SHpenkov
=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2020=E5=B9=B42=E6=9C=8826=E6=97=A5 15:20
=E6=94=B6=E4=BB=B6=E4=BA=BA: lsr@ietf.org
=E4=B8=BB=E9=A2=98: 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, 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 the ASBR. 
Thanks,
Acee
 
From: =
Lsr <lsr-bounces@ietf.org> on behalf of Sergey =
SHpenkov <sergey.v.shpenkov@gmail.com>
Date: =
Tuesday, February 25, 2020 at 2:38 PM
To: "lsr@ietf..org" =
<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
 

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From: "Ketan Talaulikar (ketant)" 
To: Chris Bowers 
CC: "lsr@ietf.org" , SPRING WG List , "Peter Psenak (ppsenak)" , Bruno Decraene 
Thread-Topic: [Lsr] clarification of locator block and locator node in draft-ietf-spring-srv6-network-programming and draft-ietf-lsr-isis-srv6-extensions
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Date: Thu, 12 Mar 2020 11:01:56 +0000
Message-ID: 
References:     <12659_1582880639_5E58D77F_12659_66_1_53C29892C857584299CBF5D05346208A48DCA80D@OPEXCAUBM43.corporate.adroot.infra.ftgroup>  <7453_1582899837_5E59227C_7453_80_1_53C29892C857584299CBF5D05346208A48DD14BA@OPEXCAUBM43.corporate.adroot.infra.ftgroup>   
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Subject: Re: [Lsr] clarification of locator block and locator node in draft-ietf-spring-srv6-network-programming and draft-ietf-lsr-isis-srv6-extensions
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Subject: Re: [Lsr] [spring] clarification of locator block and locator node in draft-ietf-spring-srv6-network-programming and draft-ietf-lsr-isis-srv6-extensions
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Ketan Talaulikar (ketant)  writes:

> [KT] The behaviors currently listed in the draft do not have an argument nor is the use of B and N required for them. We cannot preclude a future use-case or extension where such behaviors introduced are also applicable to ISIS. So IMHO ruling such aspects out might not be the right thing to do from a protocol extensibility perspective.

No opinion here on this sub-sub-TLV; however, it has been stated elsewhere that this document will be re-spun for each new behavior that is to be carried in IS-IS (not my personal preference, fwiw...).

Thanks,
Chris.
[as WG member]

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From: "Ketan Talaulikar (ketant)" 
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In-Reply-To: 
From: Chris Bowers 
Date: Thu, 12 Mar 2020 09:58:38 -0500
Message-ID: 
To: "Peter Psenak (ppsenak)" , "Ketan Talaulikar (ketant)" 
Cc: "lsr@ietf.org" , SPRING WG List ,  Bruno Decraene 
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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
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Peter,

I think that the SRv6 SID Structure Sub-Sub-TLV should be removed from
draft-ietf-lsr-isis-srv6-extensions.  I think that we should leave the
ability to include sub-sub-TLVs in the SRv6 End SID Sub-TLV, End.X SID
Sub-TLV, and LAN End.X SID Sub-TLV in the encodings for those sub-TLVs.

I don't think that the current text describing the SRv6 SID Structure
Sub-Sub-TLV would result in interoperable implementations.  Based on the
discussion with Ketan below, it appears that use cases for ISIS speakers
receiving advertised values of LB Length, LN Length, Fun. Length, and Arg.
Length are not currently well-defined.    So I think it makes sense to
defer the definition of the SRv6 SID Structure Sub-Sub-TLV to a future
document.

Thanks,
Chris

On Thu, Mar 12, 2020 at 6:02 AM Ketan Talaulikar (ketant) 
wrote:

> Hi Chris,
>
>
>
> Dropping the draft-ietf-spring-srv6-network-programming authors since we
> are now back to discussing the ISIS extensions.
>
>
>
> Please check inline below.
>
>
>
> *From:* Chris Bowers 
> *Sent:* 05 March 2020 21:53
> *To:* Ketan Talaulikar (ketant) 
> *Cc:* Ketan Talaulikar (ketant) ; lsr@ietf.org; SPRING
> WG List ; draft-ietf-spring-srv6-network-programming <
> draft-ietf-spring-srv6-network-programming@ietf.org>; Peter Psenak
> (ppsenak) ; Bruno Decraene 
> *Subject:* Re: [Lsr] clarification of locator block and locator node in
> draft-ietf-spring-srv6-network-programming and
> draft-ietf-lsr-isis-srv6-extensions
>
>
>
> Ketan,
>
>
>
> See inline [CB].
>
>
>
> On Wed, Mar 4, 2020 at 12:36 AM Ketan Talaulikar (ketant) <
> ketant@cisco.com> wrote:
>
> Hi Chris,
>
>
>
> You are right in that there is no assumption that all SRv6 locators in a
> domain are allocated from the same block. Therefore knowing the blocks us=
ed
> in the domain is useful.
>
>
>
> [CB] Since you refer to "blocks" (plural) in this sentence, are you sayin=
g
> that in the scenario where all SRv6 locators in a domain are not allocate=
d
> from the same block, you would expect different routers in the same domai=
n
> to advertise different values of B and N?
>
> *[KT] While personally I believe it would not be the usual case, it is
> left to the operator.*
>
>
>
> For example, assume we have a network where all SRv6 locators in a domain
> are not allocated from the same block.  Router A advertises an SRv6 Locat=
or
> TLV with locator =3D 2000::/64, and an SRv6 End SID sub-TLV with some
> endpoint behavior.  Router B advertises an SRv6 Locator TLV with locator =
=3D
> 3000::/64, and an SRv6 End SID sub-TLV with some endpoint behavior. What
> should routers A and B advertise as the values of B and N in their SRv6 S=
ID
> Structure Sub-Sub-TLVs ?
>
> *[KT] It is difficult for me to figure out what the block and node parts
> are with such an addressing.*
>
>
>
>
>
> The IGP drafts covers the advertisement of the B and N parts of the
> locally configured locator on the node via IGPs. On the receiver side, th=
e
> IGP may not really do much with this information, however it enables
> propagation of this information from all nodes in the network to be
> advertised out via BGP-LS (or other mechanisms) as part of the topology
> feed. Once this is part of the topology feed, it enables use-cases on
> controllers to perform network wide validation of the SRv6 SID block
> provisioning and can also help in automation of the security aspects
> described in
> https://tools.ietf.org/html/draft-ietf-6man-segment-routing-header-26#sec=
tion-5
>
>
>
> [CB] If an ISIS speaker is not expected to do anything with B and N, then
> I think the text in draft-ietf-lsr-isis-srv6-extensions needs to clarify
> this.  I have a similar observation about Fun. Length and Arg. Length in
> the SRv6 SID Structure Sub-Sub-TLV .  As far as I can tell, none of the
> endpoint behaviors that are currently specified to be carried in ISIS End=
,
> End.X, and LAN End.X SIDs sub-TLVs uses an Argument, so there is never a
> case where an SRv6 SID Structure Sub-Sub-TLV should have a non-zero value
> for Arg. Length. What should an ISIS speaker do if it receives a non-zero
> value of the Arg. Length for an endpoint behavior that doesn't use an
> argument?  Are there any use cases envisioned where an ISIS speaker needs
> to know the Arg. Length ?
>
> *[KT] The behaviors currently listed in the draft do not have an argument
> nor is the use of B and N required for them. We cannot preclude a future
> use-case or extension where such behaviors introduced are also applicable
> to ISIS. So IMHO ruling such aspects out might not be the right thing to =
do
> from a protocol extensibility perspective.*
>
>
>
> *Thanks,*
>
> *Ketan*
>
>
>
> Thanks,
>
> Ketan
>
>
>
> *From:* Chris Bowers 
> *Sent:* 02 March 2020 23:39
> *To:* Ketan Talaulikar (ketant) 
> *Cc:* Ketan Talaulikar (ketant)  <40cisco..com@dmarc.ietf.org>>; lsr@ietf.org; SPRING WG List <
> spring@ietf.org>; draft-ietf-spring-srv6-network-programming <
> draft-ietf-spring-srv6-network-programming@ietf.org>; Peter Psenak
> (ppsenak) ; Bruno Decraene 
> *Subject:* Re: [Lsr] clarification of locator block and locator node in
> draft-ietf-spring-srv6-network-programming and
> draft-ietf-lsr-isis-srv6-extensions
>
>
>
> Ketan,
>
>
>
> Based on current documents, allocating all SRv6 locators used in a domain
> from a single block is optional.
>
>
>
> However, assuming for the moment that a network operator has chosen to
> allocate all SRv6 locators used in a domain from a single block, so that
> there is a well-defined value of B and N across a domain, what is the use
> of having a router advertise its own understanding of these two values?
> And what is a receiver supposed to do with this information?
>
>
>
> Thanks,
>
> Chris
>
>
>
> On Fri, Feb 28, 2020 at 8:23 AM  wrote:
>
> Hi Ketan,
>
>
>
> Thanks fort the follow up.
>
> Clarification inline [Bruno]
>
>
>
> *From**:* Ketan Talaulikar (ketant) [mailto:ketant@cisco.com]
> *Sent:* Friday, February 28, 2020 11:11 AM
> *To:* DECRAENE Bruno TGI/OLN; Ketan Talaulikar (ketant); Chris Bowers
> *Cc:* lsr@ietf.org; SPRING WG List;
> draft-ietf-spring-srv6-network-programming; Peter Psenak (ppsenak)
> *Subject:* RE: [Lsr] clarification of locator block and locator node in
> draft-ietf-spring-srv6-network-programming and
> draft-ietf-lsr-isis-srv6-extensions
>
>
>
> Hi Bruno,
>
>
>
> I believe the description and usage of Locator is very well described and
> covered in the net-pgm draft as also the corresponding IGP extensions. Is
> the question is more about the =E2=80=9Cblock=E2=80=9D part of it (what i=
s not in the block
> part is in the node part as per the text in the net-pgm draft)?
>
>
>
> The =E2=80=9Cblock=E2=80=9D is again not a new thing. Please check the fo=
llowing:
>
> Under
> https://tools.ietf.org/html/draft-ietf-6man-segment-routing-header-26#sec=
tion-5
> =E2=80=A6 look for =E2=80=9Cblock=E2=80=9D
>
> https://tools.ietf.org/html/rfc8402#section-2 =E2=80=A6 look under SRGB f=
or SRv6
>
>
>
> [Bruno]
>
> To clarify, my question was not specific to =E2=80=9Cblock=E2=80=9D but r=
elated to the
> usage, by the receiver, of the following piece of information:
>
>
>
>       LB Length: SRv6 SID Locator Block length
>
>       LN Length: SRv6 SID Locator Node length
>
>       Fun. Length: SRv6 SID Function length
>
>       Arg. Length: SRv6 SID Arguments length
>
>
>
>
>
> So perhaps I don=E2=80=99t get Chris=E2=80=99s point and would wait for h=
im to clarify.
>
> [Bruno] I=E2=80=99ll leave this to Chris.
>
>
>
> Thanks,
>
> Ketan
>
>
>
> *From:* Lsr  *On Behalf Of *
> bruno.decraene@orange.com
> *Sent:* 28 February 2020 14:34
> *To:* Ketan Talaulikar (ketant)  <40cisco..com@dmarc.ietf.org>>; Chris Bowers 
> *Cc:* lsr@ietf.org; SPRING WG List ;
> draft-ietf-spring-srv6-network-programming <
> draft-ietf-spring-srv6-network-programming@ietf.org>; Peter Psenak
> (ppsenak) 
> *Subject:* Re: [Lsr] clarification of locator block and locator node in
> draft-ietf-spring-srv6-network-programming and
> draft-ietf-lsr-isis-srv6-extensions
>
>
>
> Hi Ketan,
>
>
>
>
>
>
>
> *From:* Lsr [mailto:lsr-bounces@ietf.org ] *On
> Behalf Of *Ketan Talaulikar (ketant)
> *Sent:* Friday, February 28, 2020 6:30 AM
>
>
>
> Hi Chris,
>
>
>
> I agree with Peter and I would suggest to drop LSR since this is not a
> protocol specific thing.
>
>
>
> I believe the text in draft-ietf-spring-srv6-network-programming clears
> says what locator block and locator node are. What more details do you
> think are required?
>
>
>
> [Bruno] Speaking as an individual, the draft could possibly clarify the
> usage of these information/fields by the receiver. Possibly using the sam=
e
> name/term (e.g. SRv6 SID Locator Block length) to ease the references
> between both drafts.
>
>
>
> Thanks,
>
> --Bruno
>
>
>
> Thanks,
>
> Ketan
>
>
>
> *From:* Lsr  *On Behalf Of *Chris Bowers
> *Sent:* 27 February 2020 22:46
> *To:* lsr@ietf.org; SPRING WG List 
> *Cc:* Peter Psenak (ppsenak) 
> *Subject:* [Lsr] clarification of locator block and locator node in
> draft-ietf-spring-srv6-network-programming and
> draft-ietf-lsr-isis-srv6-extensions
>
>
>
> SPRING and LSR WGs,
>
>
>
> I think that we need a much more detailed description of the locator bloc=
k
> 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
> >
>
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--00000000000010e5fd05a0a9a188
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Peter,

I think that the SRv6=
 SID Structure Sub-Sub-TLV should be removed from draft-ietf-lsr-isis-srv6-=
extensions.=C2=A0 I think that we should leave the ability to include sub-s=
ub-TLVs in the SRv6 End SID Sub-TLV, End.X SID Sub-TLV, and LAN End.X SID S=
ub-TLV in the encodings for those sub-TLVs.=C2=A0 

=

I don't think that the current text describing the
SRv6 SID Structure Sub-Sub-TLV would result in interoperable implementation=
s.=C2=A0 Based on the discussion with Ketan below, it appears that use case=
s for ISIS speakers receiving advertised values of LB Length, LN Length, Fu=
n. Length, and Arg. Length are not currently well-defined. =C2=A0=C2=A0 So =
I think it makes sense to=20
defer the definition of the SRv6 SID Structure Sub-Sub-TLV to a future docu=
ment.

Thanks,
Chris
On=
 Thu, Mar 12, 2020 at 6:02 AM Ketan Talaulikar (ketant) <ketant@cisco.com> wrote:











Hi Chris,


=C2=A0


Dropping the draft-ietf-spring-srv6-network-pr=
ogramming authors since we are now back to discussing the ISIS extensions.<=
u>


=C2=A0


Please check inline below.


=C2=A0


From: Chris Bowers <chrisbowers.ietf@gmail.com>


Sent: 05 March 2020 21:53

To: Ketan Talaulikar (ketant) <ketant@cisco.com>

Cc: Ketan Talaulikar (ketant) <ketant@cisco.com>; lsr@ietf.org; SPRING WG List <spring@ietf.org>; draft-ietf-spr=
ing-srv6-network-programming <draft-ietf-spring-srv6-netwo=
rk-programming@ietf.org>; Peter Psenak (ppsenak) <ppsenak@cisco.com>; Bruno De=
craene
 <bruno.d=
ecraene@orange.com>

Subject: Re: [Lsr] clarification of locator block and locator node i=
n draft-ietf-spring-srv6-network-programming and draft-ietf-lsr-isis-srv6-e=
xtensions


=C2=A0






Ketan,






=C2=A0






See inline [CB].






=C2=A0








On Wed, Mar 4, 2020 at 12:36 AM Ketan Talaulikar (ke=
tant) <ketant@cisc=
o.com> wrote:










Hi Chris,


=C2=A0


You are right in that there is no assumption that al=
l SRv6 locators in a domain are allocated from the same block. Therefore kn=
owing the blocks used in the domain is useful.










=C2=A0






[CB] Since you refer to "blocks" (plural) =
in this sentence, are you saying that in the scenario where all SRv6 locato=
rs in a domain are not allocated from the same block, you would expect diff=
erent routers in the same domain to advertise
 different values of B and N?=C2=A0 


[KT] While personally I believe it would not b=
e the usual case, it is left to the operator.


=C2=A0


For example, assume we have a network where all SRv6=
 locators in a domain are not allocated from the same block.=C2=A0 Router A=
 advertises an SRv6 Locator TLV with locator =3D 2000::/64, and an SRv6 End=
 SID sub-TLV with some endpoint behavior.=C2=A0
 Router B advertises an SRv6 Locator TLV with locator =3D 3000::/64, and an=
 SRv6 End SID sub-TLV with some endpoint behavior. What should routers A an=
d B advertise as the values of B and N in their SRv6 SID Structure Sub-Sub-=
TLVs ?


[KT] It is difficult for me to figure out what=
 the block and node parts are with such an addressing.






=C2=A0










=C2=A0


The IGP drafts covers the advertisement of the B and=
 N parts of the locally configured locator on the node via IGPs. On the rec=
eiver side, the IGP may not really do much with this
 information, however it enables propagation of this information from all n=
odes in the network to be advertised out via BGP-LS (or other mechanisms) a=
s part of the topology feed. Once this is part of the topology feed, it ena=
bles use-cases on controllers to
 perform network wide validation of the SRv6 SID block provisioning and can=
 also help in automation of the security aspects described in

https://tools.ietf.org/html/draft-ietf-6man-segment-routing-header-26#secti=
on-5


=C2=A0










[CB] If an ISIS speaker is not expected to do anythi=
ng with B and N, then I think the text in draft-ietf-lsr-isis-srv6-extensio=
ns needs to clarify this.=C2=A0 I have a similar observation about Fun. Len=
gth and Arg. Length in the SRv6 SID Structure
 Sub-Sub-TLV .=C2=A0 As far as I can tell, none of the endpoint behaviors t=
hat are currently specified to be carried in ISIS End, End.X, and LAN End.X=
 SIDs sub-TLVs uses an Argument, so there is never a case where an SRv6 SID=
 Structure Sub-Sub-TLV should have a
 non-zero value for Arg. Length. What should an ISIS speaker do if it recei=
ves a non-zero value of the Arg. Length for an endpoint behavior that doesn=
't use an argument?=C2=A0 Are there any use cases envisioned where an I=
SIS speaker needs to know the Arg. Length
 ?=C2=A0 


[KT] The behaviors currently listed in the dra=
ft do not have an argument nor is the use of B and N required for them. We =
cannot preclude a future use-case or extension where such behaviors introdu=
ced are also applicable to ISIS. So
 IMHO ruling such aspects out might not be the right thing to do from a pro=
tocol extensibility perspective.


=C2=A0


Thanks,


Ketan






=C2=A0










Thanks,


Ketan


=C2=A0


From: Chris Bowers <chrisbowers.ietf@gmail.com>


Sent: 02 March 2020 23:39

To: Ketan Talaulikar (ketant) <ketant@cisco.com=
>

Cc: Ketan Talaulikar (ketant) <ketant=3D40cisco=
.com@dmarc.ietf.org>;
lsr@ietf.org; SPRING WG List <=
s=
pring@ietf.org>; draft-ietf-spring-srv6-=
network-programming
 <draft-ietf-spring-srv6-netwo=
rk-programming@ietf.org>; Peter Psenak (=
ppsenak) <=
ppsenak@cisco.com>;
 Bruno Decraene <bruno.decraene@orange.com>

Subject: Re: [Lsr] clarification of locator block and locator node i=
n draft-ietf-spring-srv6-network-programming and draft-ietf-lsr-isis-srv6-e=
xtensions


=C2=A0






Ketan,






=C2=A0






Based on current documents, allocating all SRv6 loca=
tors used in a domain from a single block is optional.






=C2=A0






However, assuming for the moment that a network oper=
ator has chosen to allocate all SRv6 locators used in a domain from a singl=
e block, so that there is a well-defined value of
 B and N across a domain, what is the use of having a router advertise its =
own understanding of these two values?=C2=A0 And what is a receiver suppose=
d to do with this information?






=C2=A0






Thanks,






Chris




=C2=A0






On Fri, Feb 28, 2020 at 8:23 AM <bruno.decraene@orange.com> wrote:










Hi =
Ketan,


=C2=
=A0


=
Thanks fort the follow up.


=
Clarification inline [Bruno]


=
=C2=A0







From:
 Ketan Talaulikar (ketant) [mailto:ketant@cisco.com]


Sent: Friday, February 28, 2020 11:11 AM

To: DECRAENE Bruno TGI/OLN; Ketan Talaulikar (ketant); Chris Bowers<=
br>
Cc: lsr@ietf.org; SPRING WG List; draft-ietf-spring-srv=
6-network-programming;
 Peter Psenak (ppsenak)

Subject: RE: [Lsr] clarification of locator block and locator node i=
n draft-ietf-spring-srv6-network-programming and draft-ietf-lsr-isis-srv6-e=
xtensions







=C2=A0



Hi Bruno,



=C2=A0



I believe the description and usage of Locator is very well described and c=
overed in the net-pgm draft as also the corresponding IGP extensions. Is th=
e question is more about the =E2=80=9Cblock=E2=80=9D part of it (what is no=
t in the block part is in the node part as per the
 text in the net-pgm draft)?



=C2=A0



The =E2=80=9Cblock=E2=80=9D is again not a new thing. Please check the foll=
owing:



Under 
https://tools.ietf.org/html/draft-ietf-6man-segment-routing-header-26#secti=
on-5 =E2=80=A6 look for =E2=80=9Cblock=E2=80=9D



https://tools.ietf.org/html/rfc8402#section-2 =E2=80=A6 look under SRG=
B for SRv6



=C2=A0


[Bruno]<=
u>


To clarify, my =
question was not specific to =E2=80=9Cblock=E2=80=9D but related to the usa=
ge, by the receiver, of the following piece of information:


=C2=A0


=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 LB Length: SRv=
6 SID Locator Block length


=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 LN Length: SRv=
6 SID Locator Node length


=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Fun. Length: S=
Rv6 SID Function length


=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Arg. Length: S=
Rv6 SID Arguments length


=
=C2=A0


=C2=A0



So perhaps I don=E2=80=99t get Chris=E2=80=99s point and would wait for him=
 to clarify.


[Bruno] I=E2=80=
=99ll leave this to Chris.



=C2=A0



Thanks,



Ketan



=C2=A0







From: Lsr <lsr-bounces@ietf.org>
On Behalf Of bruno.decraene@orange.com

Sent: 28 February 2020 14:34

To: Ketan Talaulikar (ketant) <ketant=3D40cisco=
.com@dmarc.ietf.org>; Chris Bowers <<=
/span>chrisbowers.ietf@gmail.com&=
gt;

Cc: lsr@ietf.org; SPRING WG List =
<spring@ietf.org>;
 draft-ietf-spring-srv6-network-programming <draft-ietf-spring-srv6-network-programming@ietf.org>; Peter Psenak (ppsenak)
 <ppsenak@cisco.com>

Subject: Re: [Lsr] clarification of locator block and locator node i=
n draft-ietf-spring-srv6-network-programming and draft-ietf-lsr-isis-srv6-e=
xtensions







=C2=A0



Hi Ketan,=




=C2=A0



=C2=A0=




=C2=A0=








From: Lsr [mailto:lsr-bounces@ie=
tf.org]
On Behalf Of Ketan Talaulikar (ketant)

Sent: Friday, February 28, 2020 6:30 AM







=C2=A0



Hi Chris,



=C2=A0



I agree with Peter and I would suggest to drop LSR since this is not a prot=
ocol specific thing.



=C2=A0



I believe the text in draft-ietf-spring-srv6-network-p=
rogramming clears says what locator block and locator node are. What more d=
etails do you think are required?



=C2=A0=




[Bruno] Speaking as an =
individual, the draft could possibly clarify the usage of these information=
/fields by the receiver. Possibly using the same name/term (e.g. SRv6 SID L=
ocator Block length) to ease the references
 between both drafts.



=C2=A0=




Thanks,



--Bruno



=C2=A0



Thanks,



Ketan



=C2=A0



From: Lsr <lsr-bounces@ietf.org>
On Behalf Of Chris Bowers

Sent: 27 February 2020 22:46

To: lsr@ietf.org; SPRING WG List =
<spring@ietf.org>

Cc: Peter Psenak (ppsenak) <ppsenak@cisco.com<=
span lang=3D"EN-US">>

Subject: [Lsr] clarification of locator block and locator node in dr=
aft-ietf-spring-srv6-network-programming and draft-ietf-lsr-isis-srv6-exten=
sions



=C2=A0







SPRING and LSR WGs,







=C2=A0







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 dr=
aft-ietf-lsr-isis-srv6-extensions.=C2=A0 See original email below.







=C2=A0







Thanks,







Chris







=C2=A0









On 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

> 








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pas etre diffuses, exploites ou copies sans autorisa=
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From: "Ketan Talaulikar (ketant)" 
To: Chris Bowers , "Peter Psenak (ppsenak)" 
CC: "lsr@ietf.org" , SPRING WG List , "Bruno Decraene" 
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: AQHV7ZILnZjIpKq3N0WdLR4BCssnCqgwFDqggAA7KhCAABElwIAASL5AgAT3A4CAAmFxkIACN/CAgAkP8UCAAdirAIAABdlw
Date: Thu, 12 Mar 2020 15:24:56 +0000
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Subject: Re: [Lsr] clarification of locator block and locator node in draft-ietf-spring-srv6-network-programming and draft-ietf-lsr-isis-srv6-extensions
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From: Sergey SHpenkov 
Date: Fri, 13 Mar 2020 00:40:28 +0300
Message-ID: 
To: Aijun Wang 
Cc: lsr@ietf.org
Content-Type: multipart/mixed; boundary="0000000000002938d205a0af3de4"
Archived-At: 
Subject: Re: [Lsr] Question about OSPF (transit area routing loop)
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Hi, Aijun

=D1=87=D1=82, 12 =D0=BC=D0=B0=D1=80. 2020 =D0=B3. =D0=B2 04:21, Aijun Wang =
:

> Hi, Sergey:
>
>
>
> ABR-1 advertised the less optimal route information to other routers(in
> virtual link environment, for avoiding other possible loop scenario,
> mentioned in G.2 of RFC 2328 as pointed out by Acee), then the other
> end(ABR-3) of the virtual link should also prefer this less optimal route
> information.
>
> This is similar to your proposal at
> https://mailarchive.ietf.org/arch/browse/lsr/?gbt=3D1&index=3DrPZK_euJTkK=
0TcRhnI-l1sehxRA
>
>
>
> On the other hand, is it necessary to build another virtual link between
>  ABR-2 and ABR-3 in your topology, or else the traffic between ASBR and
> ABR-3 will be unidirectional? (ASBR can reach the ABR-3, but ABR-3 can=E2=
=80=99t
> reach the ASBR?)
>
>
>
If create another virtual link between ABR_2 and ABR_3 the path from ABR_3
to ASBR in this topology will not change.

>
>
> Best Regards.
>
>
>
> Aijun Wang
>
> China Telecom
>
>
>
> *=E5=8F=91=E4=BB=B6=E4=BA=BA:* lsr-bounces@ietf.org [mailto:lsr-bounces@i=
etf.org] *=E4=BB=A3=E8=A1=A8 *Sergey
> SHpenkov
> *=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4:* 2020=E5=B9=B43=E6=9C=8812=E6=97=
=A5 4:31
> *=E6=94=B6=E4=BB=B6=E4=BA=BA:* Aijun Wang
> *=E6=8A=84=E9=80=81:* lsr@ietf.org
> *=E4=B8=BB=E9=A2=98:* Re: [Lsr] Question about OSPF (transit area routing=
 loop)
>
>
>
> Hi Aijun,
>
>
>
>
>
> =D1=81=D1=80, 11 =D0=BC=D0=B0=D1=80. 2020 =D0=B3. =D0=B2 13:46, Aijun Wan=
g :
>
> Hi, Sergey:
>
>
>
> If so, ABR-3 should also receive this SumLSA-4 for the ASBR(with cost
> 300), and then prefer the path via ABR-2 to reach ASBR(with cost 20).
>
> Then there will be no loop then?
>
>
>
> no, because sumLSA-4 in step 16.3 will be less preferred for ABR_3 than
> previously calculated using the Dijkstra algorithm (with cost 3)
>
>
>
> Or, how many SumLAS-4 will be advertised by ABR-1? If it selects and
> advertises only one (3 or 300), then the loop will not be emerged.
>
> Currently, it seems it advertises this SumLAS-4 with the cost 300 to RT_1
> and with the cost 3 to ABR-3?
>
>
>
> only one with a cost of 300
>
>
>
> Best Regards.
>
>
>
> Aijun Wang
>
> China Telecom
>
>
>
> *=E5=8F=91=E4=BB=B6=E4=BA=BA:* lsr-bounces@ietf.org [mailto:lsr-bounces@i=
etf.org] *=E4=BB=A3=E8=A1=A8 *Sergey
> SHpenkov
> *=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4:* 2020=E5=B9=B42=E6=9C=8826=E6=97=
=A5 15:20
> *=E6=94=B6=E4=BB=B6=E4=BA=BA:* lsr@ietf.org
> *=E4=B8=BB=E9=A2=98:* 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
>
>
>
>

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Hi, Aijun

=D1=87=D1=82, 12 =D0=BC=D0=B0=D1=80. 202=
0 =D0=B3. =D0=B2 04:21, Aijun Wang <wangaijun@tsinghua.org.cn>:
Hi, Sergey:
=C2=A0=

ABR-1 advertised the less optimal route information to other ro=
uters(in virtual link environment, for avoiding other possible loop scenari=
o, mentioned in G.2 of RFC 2328 as pointed out by Acee), then the other end=
(ABR-3) of the virtual link should also prefer this less optimal route info=
rmation.
This is similar to your proposal at https:/=
/mailarchive.ietf.org/arch/browse/lsr/?gbt=3D1&index=3DrPZK_euJTkK0TcRh=
nI-l1sehxRA
=C2=A0
On the other hand, is it necessary t=
o build another virtual link between =C2=A0ABR-2 and ABR-3 in your topology=
, or else the traffic between ASBR and ABR-3 will be unidirectional? (ASBR =
can reach the ABR-3, but ABR-3 can=E2=80=99t reach the ASBR?)=

=C2=A0
If create ano=
ther virtual link between ABR_2 and ABR_3 the path from ABR_3 to ASBR in th=
is topology will not change. 
=C2=A0
Best Regards.
=
=C2=A0
Aijun Wang<=
u>
China Telecom 
=C2=A0<=
u>
=
=E5=8F=91=E4=BB=B6=E4=BA=BA: lsr-bounces@ietf.org [mailto:lsr-bounces@ietf.org] <=
span style=3D"font-size:10pt">=E4=BB=A3=E8=A1=A8 Sergey SHpenkov
=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4:<=
/span> 2020=
=E5=B9=B43=E6=9C=
=8812=E6=97=A5 4:31
=E6=94=B6=E4=BB=B6=E4=BA=BA: Aijun Wang
=E6=8A=84=E9=80=81: lsr@ietf.org
=E4=B8=BB=E9=A2=98: Re: [Lsr] Question about OSPF (tran=
sit area routing loop)
=C2=A0
=

Hi Aijun,<=
/p>
=C2=A0<=
/u>
=C2=A0
=D1=81=D1=80, 11 =D0=BC=D0=B0=D1=80. 2020 =D0=B3. =D0=B2 13:46, Aijun =
Wang <wan=
gaijun@tsinghua.org.cn>:
<=
div>
Hi, Sergey:
=C2=A0
<=
span style=3D"font-size:10.5pt;font-family:"Calibri","sans-s=
erif";color:rgb(31,73,125)" lang=3D"EN-US">If so, ABR-3 should also re=
ceive this SumLSA-4 for the ASBR(with cost 300), and then prefer the path v=
ia ABR-2 to reach ASBR(with cost 20).=

Then there will be no loop then?=

=
=C2=A0
no, because sumLSA-4 in step 16.3 will be l=
ess preferred for ABR_3 than previously calculated using the Dijkstra algor=
ithm (with cost 3) 
=C2=A0
Or, how many SumLAS-4 will be advertised=
 by ABR-1? If it selects and advertises only one (3 or 300), then the loop =
will not be emerged. 
<=
p class=3D"MsoNormal">Curr=
ently, it seems it advertises this SumLAS-4 with the cost 300 to RT_1 and w=
ith the cost 3 to ABR-3?
=
=C2=A0
only one with a cost of 300=C2=A0 
=C2=A0
B=
est Regards.
=C2=A0
Aijun Wang
China Telecom
=C2=A0<=
/u>
=E5=8F=91=E4=BB=B6=E4=BA=BA: lsr-bounces=
@ietf.org [mailto:lsr-bounces@ietf.org] =E4=
=BB=A3=E8=A1=A8 Se=
rgey SHpenkov
=E5=8F=91=E9=80=
=81=E6=97=B6=E9=97=B4: 2020=
=E5=B9=B42=E6=9C=8826=E6=97=A5 15:20
=E6=94=B6=E4=BB=B6=E4=
=BA=BA: lsr@ietf.org
=E4=B8=BB=
=E9=A2=98: Re: [Lsr] Q=
uestion about OSPF (transit area routing loop)
=C2=A0
Acee,
=C2=A0
Because ABR_1 creates SumLSA-4 =
for the ASBR not from the backbone area.=C2=A0The cost of SumLSA-4 for ASBR=
 is 300.
=C2=A0
Thanks,
Sergey
=C2=A0<=
/u>
=
=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, 
<=
span lang=3D"EN-US">I don=E2=80=99t see why RT_1 wouldn=E2=80=99t go throug=
h ABR_1 to get to the ASBR. 
Thanks,
Acee
=
=C2=A0
From: Lsr <lsr-bounces@ietf.org> on behalf of Sergey SHpenk=
ov <ser=
gey.v.shpenkov@gmail.com>
Date: Tuesday, February 25, 2020=
 at 2:38 PM
To: "lsr@ietf..org" <lsr@ietf..org>
Subject: [Lsr] Question about O=
SPF (transit area routing loop)
=C2=A0
Hi=
,
In section 16.3 of the OSPF RFC 2328 standard, i=
t is stated that all ABR routers 
connected =
to a transit area are required to check the sumLSA contained within<=
u>
this area in order to possibly improve the intra-ar=
ea and inter-area backbone routes
for themse=
lves.

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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To: Chris Bowers , "Ketan Talaulikar (ketant)" 
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From: Peter Psenak 
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Date: Fri, 13 Mar 2020 11:02:13 +0100
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Subject: Re: [Lsr] clarification of locator block and locator node in draft-ietf-spring-srv6-network-programming and draft-ietf-lsr-isis-srv6-extensions
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Hi Chris,

On 12/03/2020 15:58, Chris Bowers wrote:
> Peter,
> 
> I think that the SRv6 SID Structure Sub-Sub-TLV should be removed from 
> draft-ietf-lsr-isis-srv6-extensions.  I think that we should leave the 
> ability to include sub-sub-TLVs in the SRv6 End SID Sub-TLV, End.X SID 
> Sub-TLV, and LAN End.X SID Sub-TLV in the encodings for those sub-TLVs.
> 
> I don't think that the current text describing the SRv6 SID Structure 
> Sub-Sub-TLV would result in interoperable implementations.  Based on the

SRv6 base spec defines SID B, L, A, F.

SRv6 protocol specs are advertising these values with the SRv6 SID, they 
don't use them. The usage is outside of the scope of the protocol 
drafts. What exactly is the problem?

thanks,
Peter


> discussion with Ketan below, it appears that use cases for ISIS speakers 
> receiving advertised values of LB Length, LN Length, Fun. Length, and 
> Arg. Length are not currently well-defined.    So I think it makes sense 
> to defer the definition of the SRv6 SID Structure Sub-Sub-TLV to a 
> future document.
> 
> Thanks,
> Chris
> 
> On Thu, Mar 12, 2020 at 6:02 AM Ketan Talaulikar (ketant) 
> > wrote:
> 
>     Hi Chris,____
> 
>     __ __
> 
>     Dropping the draft-ietf-spring-srv6-network-programming authors
>     since we are now back to discussing the ISIS extensions.____
> 
>     __ __
> 
>     Please check inline below.____
> 
>     __ __
> 
>     *From:*Chris Bowers      >
>     *Sent:* 05 March 2020 21:53
>     *To:* Ketan Talaulikar (ketant)      >
>     *Cc:* Ketan Talaulikar (ketant)      >; lsr@ietf.org ;
>     SPRING WG List >;
>     draft-ietf-spring-srv6-network-programming
>          >; Peter
>     Psenak (ppsenak) >;
>     Bruno Decraene      >
>     *Subject:* Re: [Lsr] clarification of locator block and locator node
>     in draft-ietf-spring-srv6-network-programming and
>     draft-ietf-lsr-isis-srv6-extensions____
> 
>     __ __
> 
>     Ketan,____
> 
>     __ __
> 
>     See inline [CB].____
> 
>     __ __
> 
>     On Wed, Mar 4, 2020 at 12:36 AM Ketan Talaulikar (ketant)
>     > wrote:____
> 
>         Hi Chris,____
> 
>         ____
> 
>         You are right in that there is no assumption that all SRv6
>         locators in a domain are allocated from the same block.
>         Therefore knowing the blocks used in the domain is useful.____
> 
>     ____
> 
>     [CB] Since you refer to "blocks" (plural) in this sentence, are you
>     saying that in the scenario where all SRv6 locators in a domain are
>     not allocated from the same block, you would expect different
>     routers in the same domain to advertise different values of B and N?
>     ____
> 
>     */[KT] While personally I believe it would not be the usual case, it
>     is left to the operator.____/*
> 
>     */__ __/*
> 
>     For example, assume we have a network where all SRv6 locators in a
>     domain are not allocated from the same block.  Router A advertises
>     an SRv6 Locator TLV with locator = 2000::/64, and an SRv6 End SID
>     sub-TLV with some endpoint behavior. Router B advertises an SRv6
>     Locator TLV with locator = 3000::/64, and an SRv6 End SID sub-TLV
>     with some endpoint behavior. What should routers A and B advertise
>     as the values of B and N in their SRv6 SID Structure Sub-Sub-TLVs ?____
> 
>     */[KT] It is difficult for me to figure out what the block and node
>     parts are with such an addressing./*____
> 
>     ____
> 
>         ____
> 
>         The IGP drafts covers the advertisement of the B and N parts of
>         the locally configured locator on the node via IGPs. On the
>         receiver side, the IGP may not really do much with this
>         information, however it enables propagation of this information
>         from all nodes in the network to be advertised out via BGP-LS
>         (or other mechanisms) as part of the topology feed. Once this is
>         part of the topology feed, it enables use-cases on controllers
>         to perform network wide validation of the SRv6 SID block
>         provisioning and can also help in automation of the security
>         aspects described in
>         https://tools.ietf.org/html/draft-ietf-6man-segment-routing-header-26#section-5____
> 
>         ____
> 
>     [CB] If an ISIS speaker is not expected to do anything with B and N,
>     then I think the text in draft-ietf-lsr-isis-srv6-extensions needs
>     to clarify this.  I have a similar observation about Fun. Length and
>     Arg. Length in the SRv6 SID Structure Sub-Sub-TLV .  As far as I can
>     tell, none of the endpoint behaviors that are currently specified to
>     be carried in ISIS End, End.X, and LAN End.X SIDs sub-TLVs uses an
>     Argument, so there is never a case where an SRv6 SID Structure
>     Sub-Sub-TLV should have a non-zero value for Arg. Length. What
>     should an ISIS speaker do if it receives a non-zero value of the
>     Arg. Length for an endpoint behavior that doesn't use an argument? 
>     Are there any use cases envisioned where an ISIS speaker needs to
>     know the Arg. Length ? ____
> 
>     */[KT] The behaviors currently listed in the draft do not have an
>     argument nor is the use of B and N required for them. We cannot
>     preclude a future use-case or extension where such behaviors
>     introduced are also applicable to ISIS. So IMHO ruling such aspects
>     out might not be the right thing to do from a protocol extensibility
>     perspective.____/*
> 
>     */__ __/*
> 
>     */Thanks,____/*
> 
>     */Ketan/*____
> 
>     __ __
> 
>         Thanks,____
> 
>         Ketan____
> 
>         ____
> 
>         *From:*Chris Bowers          >
>         *Sent:* 02 March 2020 23:39
>         *To:* Ketan Talaulikar (ketant)          >
>         *Cc:* Ketan Talaulikar (ketant)
>                  >; lsr@ietf.org
>         ; SPRING WG List          >;
>         draft-ietf-spring-srv6-network-programming
>                  >;
>         Peter Psenak (ppsenak)          >; Bruno Decraene
>         >
>         *Subject:* Re: [Lsr] clarification of locator block and locator
>         node in draft-ietf-spring-srv6-network-programming and
>         draft-ietf-lsr-isis-srv6-extensions____
> 
>         ____
> 
>         Ketan,____
> 
>         ____
> 
>         Based on current documents, allocating all SRv6 locators used in
>         a domain from a single block is optional.____
> 
>         ____
> 
>         However, assuming for the moment that a network operator has
>         chosen to allocate all SRv6 locators used in a domain from a
>         single block, so that there is a well-defined value of B and N
>         across a domain, what is the use of having a router advertise
>         its own understanding of these two values?  And what is a
>         receiver supposed to do with this information?____
> 
>         ____
> 
>         Thanks,____
> 
>         Chris____
> 
>         ____
> 
>         On Fri, Feb 28, 2020 at 8:23 AM          > wrote:____
> 
>             Hi Ketan,____
> 
>             ____
> 
>             Thanks fort the follow up.____
> 
>             Clarification inline [Bruno]____
> 
>             ____
> 
>             *From**:*Ketan Talaulikar (ketant) [mailto:ketant@cisco.com
>             ]
>             *Sent:* Friday, February 28, 2020 11:11 AM
>             *To:* DECRAENE Bruno TGI/OLN; Ketan Talaulikar (ketant);
>             Chris Bowers
>             *Cc:* lsr@ietf.org ; SPRING WG List;
>             draft-ietf-spring-srv6-network-programming; Peter Psenak
>             (ppsenak)
>             *Subject:* RE: [Lsr] clarification of locator block and
>             locator node in draft-ietf-spring-srv6-network-programming
>             and draft-ietf-lsr-isis-srv6-extensions____
> 
>             ____
> 
>             Hi Bruno,____
> 
>             ____
> 
>             I believe the description and usage of Locator is very well
>             described and covered in the net-pgm draft as also the
>             corresponding IGP extensions. Is the question is more about
>             the “block” part of it (what is not in the block part is in
>             the node part as per the text in the net-pgm draft)?____
> 
>             ____
> 
>             The “block” is again not a new thing. Please check the
>             following:____
> 
>             Under
>             https://tools.ietf.org/html/draft-ietf-6man-segment-routing-header-26#section-5
>             … look for “block”____
> 
>             https://tools.ietf.org/html/rfc8402#section-2 … look under
>             SRGB for SRv6____
> 
>             ____
> 
>             [Bruno]____
> 
>             To clarify, my question was not specific to “block” but
>             related to the usage, by the receiver, of the following
>             piece of information:____
> 
>             ____
> 
>                    LB Length: SRv6 SID Locator Block length____
> 
>                    LN Length: SRv6 SID Locator Node length____
> 
>                    Fun. Length: SRv6 SID Function length____
> 
>                    Arg. Length: SRv6 SID Arguments length____
> 
>             ____
> 
>             ____
> 
>             So perhaps I don’t get Chris’s point and would wait for him
>             to clarify.____
> 
>             [Bruno] I’ll leave this to Chris.____
> 
>             ____
> 
>             Thanks,____
> 
>             Ketan____
> 
>             ____
> 
>             *From:*Lsr              > *On Behalf Of
>             *bruno.decraene@orange.com 
>             *Sent:* 28 February 2020 14:34
>             *To:* Ketan Talaulikar (ketant)
>                          >; Chris Bowers
>             >
>             *Cc:* lsr@ietf.org ; SPRING WG List
>             >;
>             draft-ietf-spring-srv6-network-programming
>                          >;
>             Peter Psenak (ppsenak)              >
>             *Subject:* Re: [Lsr] clarification of locator block and
>             locator node in draft-ietf-spring-srv6-network-programming
>             and draft-ietf-lsr-isis-srv6-extensions____
> 
>             ____
> 
>             Hi Ketan,____
> 
>             ____
> 
>             ____
> 
>             ____
> 
>             *From:*Lsr [mailto:lsr-bounces@ietf.org] *On Behalf Of
>             *Ketan Talaulikar (ketant)
>             *Sent:* Friday, February 28, 2020 6:30 AM____
> 
>             ____
> 
>             Hi Chris,____
> 
>             ____
> 
>             I agree with Peter and I would suggest to drop LSR since
>             this is not a protocol specific thing.____
> 
>             ____
> 
>             I believe the text in
>             draft-ietf-spring-srv6-network-programming clears says what
>             locator block and locator node are. What more details do you
>             think are required?____
> 
>             ____
> 
>             [Bruno] Speaking as an individual, the draft could possibly
>             clarify the usage of these information/fields by the
>             receiver. Possibly using the same name/term (e.g. SRv6 SID
>             Locator Block length) to ease the references between both
>             drafts.____
> 
>             ____
> 
>             Thanks,____
> 
>             --Bruno____
> 
>             ____
> 
>             Thanks,____
> 
>             Ketan____
> 
>             ____
> 
>             *From:*Lsr              > *On Behalf Of *Chris Bowers
>             *Sent:* 27 February 2020 22:46
>             *To:* lsr@ietf.org ; SPRING WG List
>             >
>             *Cc:* Peter Psenak (ppsenak)              >
>             *Subject:* [Lsr] clarification of locator block and locator
>             node in draft-ietf-spring-srv6-network-programming and
>             draft-ietf-lsr-isis-srv6-extensions____
> 
>             ____
> 
>             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
>                  > ____
> 
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>             Ce message et ses pieces jointes peuvent contenir des
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>             vous avez recu ce message par erreur, veuillez le signaler____
> 
>             a l'expediteur et le detruire ainsi que les pieces jointes.
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> 


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To: Christian Hopps , spring@ietf.org
Cc: Chris Bowers , "lsr@ietf.org" ,  Bruno Decraene 
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Subject: Re: [Lsr] [spring] clarification of locator block and locator node in draft-ietf-spring-srv6-network-programming and draft-ietf-lsr-isis-srv6-extensions
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On 12/03/2020 12:33, Christian Hopps wrote:
> 
> Ketan Talaulikar (ketant)  writes:
> 
>> [KT] The behaviors currently listed in the draft do not have an argument nor is the use of B and N required for them. We cannot preclude a future use-case or extension where such behaviors introduced are also applicable to ISIS. So IMHO ruling such aspects out might not be the right thing to do from a protocol extensibility perspective.
> 
> No opinion here on this sub-sub-TLV; however, it has been stated elsewhere that this document will be re-spun for each new behavior that is to be carried in IS-IS (not my personal preference, fwiw...).

"it has been stated elsewhere that this document will be re-spun for 
each new behavior"

I don't believe above was the outcome. Instead, a new document will be 
needed for any new behavior.

thanks,
Peter

> 
> Thanks,
> Chris.
> [as WG member]
> 


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Cc: Christian Hopps , "Peter Psenak (ppsenak)" , "lsr@ietf.org" , "Acee Lindem (acee)" , "draft-ietf-lsr-isis-srv6-extensions@ietf.org" 
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To: "Les Ginsberg (ginsberg)" 
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Subject: Re: [Lsr] "Legal" endpoint behaviors [draft-ietf-lsr-isis-srv6-extensions-06.txt]
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> On Mar 11, 2020, at 10:38 AM, Les Ginsberg (ginsberg) =
 wrote:
>=20
> Chris -
>=20
>=20
>>=20
>> Do you think we should get rid of the "used in" columns in the IS-IS =
TLV and
>> sub-TLV registries? The documents that define those TLVs and sub-TLVs
>> already indicate which PDUs and TLVs they go in, so why do we need =
that
>> info in the registry?
>>=20
> [Les:] The difference for me is that the definition of sub-TLVs =
associated with the related set of TLVs is scattered across multiple =
RFCs. The additional information in the registry allows us to find this =
information in one place.
> Here, there is only one relevant IS-IS draft on this technology =
(SRv6). If the set of behaviors which can be advertised in IS-IS =
changes, then an additional IS-IS document (or a bis) will be written - =
and it likely would be required for other reasons.

I believe you're saying that in the future we will have new documents =
(if you don't respin) that define the legal behaviors to be advertised. =
And yet that's how I read your first paragraphs reason for this info =
being justified for sub-TLVs (where they are advertised being spread =
around multiple RFCs). I don't see how they are different, which makes =
me think I am misunderstanding what your saying.

I'm happy to move on from this surprisingly contentious ask, as we could =
always back-add the registry in the next document that gets published.

Thanks,
Chris.
[as WG member]

>=20
> We still may not agree - but I hope we at least understand each other =
better.
>=20
>   Les
>=20
> _______________________________________________
> Lsr mailing list
> Lsr@ietf.org
> https://www.ietf.org/mailman/listinfo/lsr
>=20


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From: Peter Psenak 
To: Alvaro Retana , "draft-ietf-isis-mpls-elc@ietf.org" 
Cc: "Acee Lindem (acee)" , "lsr-chairs@ietf.org" , "lsr@ietf.org" 
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Subject: Re: [Lsr] AD Review of draft-ietf-isis-mpls-elc-10
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Hi Alvaro,

thanks for your comments.

Let's first close the ISIS ELC draft before starting to work on OSPF 
one, as many comments are common and will be applicable to both ISIS and 
OSPF variants.

Please see inline (##PP):

On 29/02/2020 06:00, Alvaro Retana wrote:
> Dear authors:
> 
> This is my review of draft-ietf-isis-mpls-elc-10.  I reviewed this
> document alongside draft-ietf-ospf-mpls-elc-12, so many comments are
> the same/similar.  Thank you for the work in both of them!
> 
> Besides the in-line comments, I want to point out here that this
> specification is incomplete.  It needs to have (1) a formal
> description of the new MSD-Type (similar to §5/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	   Multiprotocol Label Switching (MPLS) has defined a mechanism to load-
> 21	   balance traffic flows using Entropy Labels (EL).  An ingress Label
> 22	   Switching Router (LSR) cannot insert ELs for packets going into a
> 23	   given Label Switched Path (LSP) unless an egress LSR has indicated
> 24	   via signaling that it has the capability to process ELs, referred to
> 25	   as Entropy Label Capability (ELC), on that tunnel.  In addition, it
> 26	   would be useful for ingress LSRs to know each LSR's capability for
> 27	   reading the maximum label stack depth and performing EL-based load-
> 28	   balancing, referred to as Entropy Readable Label Depth (ERLD).  This
> 29	   document defines a mechanism to signal these two capabilities using
> 30	   IS-IS.  These mechanisms are particularly useful, where label
> 31	   advertisements are done via protocols like IS-IS.
> 
> [nit] s/	/as the Entropy Label Capability

##PP
done

> 
> [minor] "protocols like IS-IS"  That last sentence sounds as if there
> were other options; for example advertise labels with OSPF and then
> use the extensions here.  It's just a minor point, but I think that
> maybe that last sentence is not needed.

##PP
removed last sentence

> 
> 
> ...
> 81	1.  Introduction
> 
> 83	   [RFC6790] describes a method to load-balance Multiprotocol Label
> 84	   Switching (MPLS) traffic flows using Entropy Labels (EL).  "The Use
> 85	   of Entropy Labels in MPLS Forwarding" [RFC6790] introduces the
> 86	   concept of Entropy Label Capability (ELC) and defines the signalings
> 87	   of this capability via MPLS signaling protocols.  Recently,
> 88	   mechanisms have been defined to signal labels via link-state Interior
> 89	   Gateway Protocols (IGP) such as IS-IS
> 90	   [I-D.ietf-isis-segment-routing-extensions].  In such scenarios, the
> 91	   defined signaling mechanisms are inadequate.  This draft defines a
> 92	   mechanism to signal the ELC using IS-IS.  This mechanism is useful
> 93	   when the label advertisement is also done via IS-IS.
> 
> [nit] s/"The Use of Entropy Labels in MPLS Forwarding" [RFC6790]/It also

##PP
done
> 
> [nit] s/signalings/signaling

##PP
done

> 
> [nit] "In such scenarios, the defined signaling mechanisms are
> inadequate." Take this sentence out: the rest of the paragraph is
> enough.

##PP
done
> 
> 
> 95	   In addition, in the cases where LSPs are used for whatever reasons
> 96	   (e.g., SR-MPLS [I-D.ietf-spring-segment-routing-mpls]), it would be
> 97	   useful for ingress LSRs to know each intermediate LSR's capability of
> 98	   reading the maximum label stack depth and performing EL-based load-
> 99	   balancing.  This capability, referred to as Entropy Readable Label
> 100	   Depth (ERLD) as defined in [I-D.ietf-mpls-spring-entropy-label] may
> 101	   be used by ingress LSRs to determine the position of the EL label in
> 102	   the stack, and whether it's necessary to insert multiple ELs at
> 103	   different positions in the label stack.
> 
> [nit] s/in the cases where LSPs are used for whatever reasons/in cases
> where LSPs are used

##PP
done
> 
> 
> 105	2.  Terminology
> 
> 107	   This memo makes use of the terms defined in [RFC6790], [RFC4971] and
> 108	   [I-D.ietf-mpls-spring-entropy-label].
> 
> [minor] I'm not sure why rfc4971 is referenced here; what terminology
> is needed from it?

##PP
removed the reference to rfc4971


> 
> 
> ...
> 116	3.  Advertising ELC Using IS-IS
> 
> 118	   Even though ELC is a property of the node, in some cases it is
> 119	   advantageous to associate and advertise the ELC with a prefix.  In a
> 120	   multi-area network, routers may not know the identity of the prefix
> 121	   originator in a remote area, or may not know the capabilities of such
> 122	   originator.  Similarly in a multi-domain network, the identity of the
> 123	   prefix originator and its capabilities may not be known to the
> 124	   ingress LSR.
> 
> [minor] Is there a difference that are you trying to highlight between
> multi-area and multi-domain?  The last two sentences seem redundant to
> me; using "domain" should be enough.

##PP
Multi-area and multi-domain are two different cases. I believe it is 
important to keep both in the text.

	
> 
> 
> 126	   One bit of the "Bit Values for Prefix Attribute Flags Sub-TLV"
> 127	   registry defined in [RFC7794] (Bit 3 is desired) is to be assigned by
> 128	   the IANA for the ELC.  If a router has multiple line cards, the
> 129	   router MUST NOT announce the ELC for any prefixes that are locally
> 130	   attached unless all of its line-cards are capable of processing ELs.
> 131	   If a router supports ELs on all of its line-cards, it SHOULD set the
> 132	   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.  Perhaps change to something like:
> 
>        Bit 3 in the Prefix Attribute Flags [RFC7794] is used as the ECL Flag
>        (E-flag), as shown in Figure 1.

##PP
done

> 
> 
> [major] From a general router architecture point of view, I understand
> what you mean by line-card.  But, strictly speaking from a
> specification point of view, what is a line-card?  Would using
> "interface" instead be an acceptable generalization?

##PP
change to interface
> 
> 
> [minor] Is there a difference between "prefixes that are locally
> attached" and a "local host prefix"?  Are all locally-attached
> prefixes host prefixes (/32 or /128)?

##PP
changed to "local host prefix"

> 
> 
> [major] "it SHOULD set the ELC for every local host prefix"  If ELs
> are supported in all the interfaces, when would a router not set the
> ELC?  IOW, why is "MUST" not used instead of "SHOULD"?

##PP
advertising ELC is not a MUST. It's an optional information that the 
originator should advertise, but if it is not, it is not going to break 
anything really.

> 
> 
> [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):

##PP
if we only keep the second sentence, the reader may not know what to do 
in case where some interfaces do not support ELC. I believe it is good 
to keep both.

> 
>     If a router supports ELs on all of its interfaces, it MUST set the E-flag
>     (ELC Flag) for every local prefix it advertises.
> 
> 
> 134	          0 1 2 3 4 5 6 7...
> 135	         +-+-+-+-+-+-+-+-+...
> 136	         |X|R|N|E|        ...
> 137	         +-+-+-+-+-+-+-+-+...
> 138	               Figure 1: Prefix Attribute Flags
> 
> 140	               E-flag: ELC Flag (Bit 3)
> 141	                   Set for local host prefix of the originating node
> 142	                   if it supports ELC.
> 
> [nit] Justify the description in line with the text (move it to the left).

##PP
done

> 
> 
> 144	   When a router leaks a prefix between two levels (upwards or
> 145	   downwards), it MUST preserve the ELC signaling for this prefix.
> 
> [nit] Going up is not really leaking. ;-)

##PP
ok, changed to "propagate".

> 
> [minor] An Informative reference to rfc5302 would be nice.

##PP
added.

> 
> Suggestion>
> 
>     When a router distributes a prefix between two levels [RFC5302] it MUST
>     preserve the E-flag setting.


##PP
I prefer:

"When a router propagates a prefix between ISIS levels [RFC5302], it 
MUST preserve the ELC signaling for this prefix."


> 
> 
> 147	   When redistributing a prefix between two IS-IS protocol instances or
> 148	   redistributing from another protocol to an IS-IS protocol instance, a
> 149	   router SHOULD preserve the ELC signaling for that prefix.  The exact
> 150	   mechanism used to exchange ELC between protocol instances running on
> 151	   an ASBR is outside of the scope of this document and is
> 152	   implementation specific.
> 
> [minor] s/ELC signaling/ELC setting

##PP
we use "signaling" for the inter-area propagation, I would prefer to 
keep the same terminology for the redistribution.


> 
> [nit] Please expand ASBR.

##PP
done.

> 
> [nit] s/ and is implementation specific./.

##PP
done

> 
> 
> 154	4.  Acknowledgements
> 
> [major] Move this section to just before the References.

##PP
done

> 
> 
> ...
> 161	5.  Advertising ERLD Using IS-IS
> 
> [major] draft-ietf-mpls-spring-entropy-label says that "To advertise
> an ERLD value, a SPRING router:  MUST be entropy label capable".  This
> requirement must be translated to this document so that the ERLD is
> only advertised if the ELC is also advertised.  I'm assuming that the
> ERLD should be ignored if the ELC is not advertised -- but that should
> be explicitly defined as well.  If the ELC is advertised, but the ERLD
> isn't, what value should be assumed, 0?


##PP
RFC8662 already set the rules on when the ERLD can be advertised and 
that behavior is orthogonal to protocol which is being used to advertise 
the ERLD/ELC.

Same in terms of what should be assumed when the ELC is advertised, but 
ERLD is not - has nothing to do with the advertising protocol - should 
be specified in RFC8662

I don't feel any of the above should be specified in the IGP ELC drafts.



> 
> 
> 163	   A new MSD-type of the Node MSD ((Maximum SID Depth) sub-TLV
> 164	   [RFC8491], called ERLD is defined to advertise the ERLD of a given
> 165	   router.  As shown in Figure 2, it is formatted as described in
> 166	   [RFC8491] with a new MSD-Type code to be assigned by IANA (the type
> 167	   code of 2 is desired) and the Value field is set to the ERLD in the
> 168	   range between 0 to 255.  The scope of the advertisement depends on
> 169	   the application.  If a router has multiple line-cards with different
> 170	   capabilities of reading the maximum label stack depth, the router
> 171	   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. ;-)

##PP
changed to:

"A new MSD-type , called ERLD is defined to
advertise the ERLD of a given router"
> 
> 
> [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.

##PP
done

> 
> [minor] s/Value/MSD-Value

##PP
done.

> 
> 
> ...
> 180	   When the ERLD MSD-Type is received in the Link MSD Sub-TLV, it MUST
> 181	   be ignored.
> 
> [nit] s/When the/If the

##PP
done
> 
> 
> 183	6.  Signaling ELC and ERLD in BGP-LS
> ...
> 188	   The ELC Flag included in the Prefix Attribute Flags sub-TLV, as
> 189	   defined in Section 3, is advertised using the Prefix Attribute Flags
> 190	   TLV (TLV 1170) of the BGP-LS IPv4/IPv6 Prefix NLRI Attribute as
> 191	   defined in section 2.3.2 of
> 192	   [I-D.ietf-idr-bgp-ls-segment-routing-ext].
> 
> [nit] Suggestion>
> 
>     The ELC is advertised using the Prefix Attribute Flags TLV as defined in
>     [I-D.ietf-idr-bgp-ls-segment-routing-ext].

##PP
done

> 
> 194	   The ERLD MSD-type introduced for IS-IS in Section 5 is advertised
> 195	   using the Node MSD TLV (TLV 266) of the BGP-LS Node NLRI Attribute as
> 196	   defined in section 3 of [I-D.ietf-idr-bgp-ls-segment-routing-msd].
> 
> [nit] Suggestion>
> 
>     The ERLD-MSD is advertised using the Node MSD TLV as defined in
>     [I-D.ietf-idr-bgp-ls-segment-routing-msd].

##PP
done

> 
> 
> 198	7.  IANA Considerations
> 
> 200	   IANA is requested to allocate the E-bit (bit position 3 is desired)
> 201	   from the "Bit Values for Prefix Attribute Flags Sub-TLV" registry.
> 
> 203	   IANA is requested to allocate a MSD type (the type code of 2 is
> 204	   desired) from the "IGP MSD Types" registry for ERLD.
> 
> [major] IANA has already assigned the values.  Suggestion>
> 
>     Early allocation has been done by IANA for this document as follows:
> 
>     - Bit 3 in the Bit Values for Prefix Attribute Flags Sub-TLV registry has
>     been assigned to the ELC Flag.  IANA is asked to update the registry to
>     reflect the name used in this document: ECL Flag (E-flag).
> 
>     - Type 2 in the IGP MSD-Types registry has been assigned for the ERLD-MSD.
>     IANA is asked to update the registry to reflect the name used in this
>     document: ERLD-MSD.

##PP
done

> 
> 
> 206	8.  Security Considerations
> 
> 208	   The security considerations as described in [RFC4971] nd
> 209	   [I-D.ietf-mpls-spring-entropy-label] are applicable to this document.
> 
> [minor] Why?  Also, I think that some of the other references should
> be added here.  Suggestion:
> 
>     This document specifies the ability to advertise additional node
>     capabilities using IS-IS and BGP-LS.  As such, the security considerations
>     as described in [RFC4971], [RFC7752], [RFC7794], [RFC8491],
>     [I-D.ietf-idr-bgp-ls-segment-routing-ext],
>     [I-D.ietf-idr-bgp-ls-segment-routing-msd] and
>     [I-D.ietf-mpls-spring-entropy-label] are applicable to this document.

##PP
done
> 
> 
> 211	   Incorrectly setting the E flag (ELC capable) (during origination,
> 212	   leaking or redistribution) may lead to black-holing of the traffic on
> 213	   the egress node.
> 
> [minor] s/E flag (ELC capable)/E flag

##PP

done

> 
> [minor] s/during origination, leaking or redistribution/during
> origination or redistribution

##PP
change to:

"during origination, propagation or redistribution"

> 
> 
> [major] "...may lead to black-holing of the traffic on the egress
> node."  I'm not sure I understand how, but the ELC advertisement
> should be accompanied by the ERLD-MSD -- see my questions at the
> beginning of §5.

##PP
the text talks about the ELC flag only, not about ERLD. If the egress 
sets the E flag, while it is not capable of ELC processing the traffic 
could be dropped at egress PE - that's what the text says and it is correct.

It is not mandatory to advertise ERLD if the node is ELC capable. It is 
however not allowed to advertise ERLD if the node is not ELC capable by 
RFC8662.

> 
> 
> 215	   Incorrectly setting of the ERLD value may lead to poor load-balancing
> 216	   of the traffic.
> 
> [minor] "may lead to poor load-balancing"  If the ERLD is low, then
> the traffic may not be load balanced at all...that is not "poor", it
> is "0".

##PP
would "lead to poor or no load-balancing" be good enough?

> 
> 
> ...
> 244	10.1.  Normative References
> ...
> 259	   [I-D.ietf-mpls-spring-entropy-label]
> 260	              Kini, S., Kompella, K., Sivabalan, S., Litkowski, S.,
> 261	              Shakir, R., and J. Tantsura, "Entropy label for SPRING
> 262	              tunnels", draft-ietf-mpls-spring-entropy-label-12 (work in
> 263	              progress), July 2018.
> 
> == Outdated reference: draft-ietf-mpls-spring-entropy-label has been
>     published as RFC 8662

##PP
done
> 
> 
> 265	   [I-D.ietf-spring-segment-routing-mpls]
> 266	              Bashandy, A., Filsfils, C., Previdi, S., Decraene, B.,
> 267	              Litkowski, S., and R. Shakir, "Segment Routing with MPLS
> 268	              data plane", draft-ietf-spring-segment-routing-mpls-22
> 269	              (work in progress), May 2019.
> 
> == Outdated reference: draft-ietf-spring-segment-routing-mpls has been
>     published as RFC 8660

##done

> 
> [minor] This reference can be Informative.

##PP
done


> 
> 
> ...
> 276	   [RFC4971]  Vasseur, JP., Ed., Shen, N., Ed., and R. Aggarwal, Ed.,
> 277	              "Intermediate System to Intermediate System (IS-IS)
> 278	              Extensions for Advertising Router Information", RFC 4971,
> 279	              DOI 10.17487/RFC4971, July 2007,
> 280	              .
> 
> ** Obsolete normative reference: RFC 4971
> ** Replace with rfc7981

##PP
done

> 
> 
> ...
> 307	10.2.  Informative References
> 
> 309	   [I-D.ietf-isis-segment-routing-extensions]
> 310	              Previdi, S., Ginsberg, L., Filsfils, C., Bashandy, A.,
> 311	              Gredler, H., and B. Decraene, "IS-IS Extensions for
> 312	              Segment Routing", draft-ietf-isis-segment-routing-
> 313	              extensions-25 (work in progress), May 2019.
> 
> == Outdated reference: draft-ietf-isis-segment-routing-extensions has been
>     published as RFC 8667

##PP
done


thanks,
Peter
> 
> 


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From nobody Mon Mar 16 11:54:51 2020
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From: "Susan Hares" 
To: "'Acee Lindem \(acee\)'" , "'wangyali'" , 
Cc: "'IDR List'" 
References: 
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Date: Mon, 16 Mar 2020 14:54:35 -0400
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Subject: Re: [Lsr]  =?utf-8?b?W0lkcl0gIOetlOWkjTogIE5ldyBWZXJzaW9uIE5vdGlmaWNh?= =?utf-8?q?tion_for_draft-wang-lsr-ospf-ifit-node-capability-02?=
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+1  to Acee Comments from IDR co-chair.   We are trying to make life =
easier for you-all.=20

Thanks, Sue=20

-----Original Message-----
From: Idr [mailto:idr-bounces@ietf.org] On Behalf Of Acee Lindem (acee)
Sent: Saturday, March 14, 2020 2:18 PM
To: wangyali; lsr@ietf.org
Cc: IDR List
Subject: Re: [Idr] =E7=AD=94=E5=A4=8D: [Lsr] New Version Notification =
for draft-wang-lsr-ospf-ifit-node-capability-02

Hi Yali,
Please add some more context to the draft as to how the information will =
be used. I say draft rather than drafts since you can really combine the =
OSPF draft, IS-IS draft, and BGP-LS draft into a single LSR document. =
For RFC 8379, we included the BGP-LS specification in the OSPF draft and =
the IDR chairs have agreed to this for simple encodings such as this =
one. =20
Thanks,
Acee

=EF=BB=BFOn 3/10/20, 4:46 AM, "wangyali"  wrote:

    Dear Acee,
   =20
    Thanks a lot for your comments. I have revised the title of drafts =
and will take your suggestion to add more text on how to use the IFIT =
Capability information, once the submission is opened. Here is my quick =
reply:
   =20
    IFIT is deployed in a specific domain referred as the IFIT domain. =
One network domain may consists of multiple IFIT domain. Within the IFIT =
domain, one or more IFIT-options are added into packet at the =
IFIT-enabled head node that is referred to as the =E2=80=9CIFIT =
encapsulating node=E2=80=9D. Then IFIT data fields MAY be updated by =
IFIT transit nodes that the packet traverses. Finally, the data fields =
are removed at a device that is referred to as the =E2=80=9CIFIT =
decapsulating node=E2=80=9D.=20
   =20
    The IFIT data fields must not leak to other domains. So, the IFIT =
encapsulating node need to know if the decapsulating node is able to =
support the IFIT capability. So that it can decide whether to add the =
IFIT-option or not.
   =20
    The solution is similar to RFC8491. We use IGP to advertise the =
capability, so that head node can use. By using BGP-LS, a centralized =
controller can also learn the IFIT Capability of nodes to determine =
whether a particular IFIT Option type can be supported in a given =
network.
   =20
    Best regards,
    Yali
   =20
    -----=E9=82=AE=E4=BB=B6=E5=8E=9F=E4=BB=B6-----
    =E5=8F=91=E4=BB=B6=E4=BA=BA: Acee Lindem (acee) =
[mailto:acee@cisco.com]=20
    =E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: =
2020=E5=B9=B43=E6=9C=889=E6=97=A5 18:30
    =E6=94=B6=E4=BB=B6=E4=BA=BA: wangyali ; =
lsr@ietf.org
    =E4=B8=BB=E9=A2=98: Re: [Lsr] New Version Notification for =
draft-wang-lsr-ospf-ifit-node-capability-02
   =20
    Hi Yali,
   =20
    A couple of very basic comments on these drafts. They are definitely =
not ready for consideration.=20
   =20
        1. IFIT is never expanded as an acronym. Seems it should be as =
early as the title.=20
   =20
              OSPF extensions for Advertising In-Situ Flow Information =
Telemetry (IFIT) Capability
   =20
       2. You probably could come up with a more succinct acronym for =
IFIT.=20
   =20
       3. The has no specification of how the capabilities are used. Are =
they purely informational?=20
   =20
    Thanks,
    Acee
   =20
    =20
   =20
   =20
    On 3/9/20, 4:33 AM, "Lsr on behalf of wangyali" =
 wrote:
   =20
        Dear all,
       =20
        I'm Yali. Following is a new version of I-D, =
draft-wang-lsr-ospf-ifit-node-capability-02 I submitted recently.
       =20
        Please let me know your questions and comments. Thank you.
       =20
        >>>>>>>>>>>
        Name:		draft-wang-lsr-ospf-ifit-node-capability
        Revision:	02
        Title:		Extensions to OSPF for Advertising IFIT Node Capability
        Document date:	2020-03-09
        Group:		Individual Submission
        Pages:		7
        URL:            =
https://www.ietf.org/internet-drafts/draft-wang-lsr-ospf-ifit-node-capabi=
lity-02.txt
        Status:         =
https://datatracker.ietf.org/doc/draft-wang-lsr-ospf-ifit-node-capability=
/
        Htmlized:       =
https://tools.ietf.org/html/draft-wang-lsr-ospf-ifit-node-capability-02
        Htmlized:       =
https://datatracker.ietf.org/doc/html/draft-wang-lsr-ospf-ifit-node-capab=
ility
        Diff:           =
https://www.ietf.org/rfcdiff?url2=3Ddraft-wang-lsr-ospf-ifit-node-capabil=
ity-02
       =20
        Abstract:
           This document defines a way for an Open Shortest Path First =
(OSPF)
           router originating the RI LSA to announce IFIT node =
capabilities
           within the entire routing domain.  A new optional TLV is =
extended to
           the OSPF RI Opaque LSA [RFC7770] to carry the IFIT node =
capability
           information.  Such advertisements enable IFIT applications in =
an
           operational network domain.  Here, the term "OSPF" includes =
both
           OSPFv2 and OSPFv3.
       =20
        Best regards,
        Yali WANG
        _______________________________________________
        Lsr mailing list
        Lsr@ietf.org
        https://www.ietf.org/mailman/listinfo/lsr
       =20
   =20
   =20

_______________________________________________
Idr mailing list
Idr@ietf.org
https://www.ietf.org/mailman/listinfo/idr


From nobody Wed Mar 18 07:39:12 2020
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Subject: [Lsr] [Errata Rejected] RFC2328 (5956)
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The following errata report has been rejected for RFC2328,
"OSPF Version 2".

--------------------------------------
You may review the report below and at:
https://www.rfc-editor.org/errata/eid5956

--------------------------------------
Status: Rejected
Type: Technical

Reported by: Marcelo Bustani 
Date Reported: 2020-01-08
Rejected by: Alvaro Retana (IESG)

Section: 12.4.1

Original Text
-------------
Router-LSAs

If the state of the interface is Loopback, add a Type 3
link (stub network) as long as this is not an interface
to an unnumbered point-to-point network.  The Link ID
should be set to the IP interface address, the Link Data
set to the mask 0xffffffff (indicating a host route),
and the cost set to 0.

===================================
12.4.1.4.  Describing Point-to-MultiPoint interfaces

                For operational Point-to-MultiPoint interfaces, one or
                more link descriptions are added to the router-LSA as
                follows:

                o   A single Type 3 link (stub network) is added with
                    Link ID set to the router's own IP interface
                    address, Link Data set to the mask 0xffffffff
                    (indicating a host route), and cost set to 0.
=============================================================================
C.3 Router interface parameters
 
 Interface output cost
            The cost of sending a packet on the interface, expressed in
            the link state metric.  This is advertised as the link cost
            for this interface in the router's router-LSA. The interface
            output cost must always be greater than 0.


Corrected Text
--------------
"cost set to 0" to at least "greater than 0"

Notes
-----
The section 12.4.1 and 12.4.1.4 are inconsistent with the appendix c.3.

These both section we find the cost to stub networks have to be set to 0, but in appendix c.3 we see that the interfaces must have greater than 0.
 --VERIFIER NOTES-- 
A discussion on the WG list (lsr) resulted a consensus of no change needed. 
https://mailarchive.ietf.org/arch/msg/lsr/FFiqi15XPunSwOV5BO1pl4o5xYY/

--------------------------------------
RFC2328 (no draft string recorded)
--------------------------------------
Title               : OSPF Version 2
Publication Date    : April 1998
Author(s)           : J. Moy
Category            : INTERNET STANDARD
Source              : Open Shortest Path First IGP
Area                : Routing
Stream              : IETF
Verifying Party     : IESG


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A new interim meeting request has just been submitted by Acee Lindem.

This request requires approval by the Area Director of the Routing Area

The meeting can be approved here: 
https://datatracker.ietf.org/meeting/interim/request/interim-2020-lsr-01



---------------------------------------------------------
Working Group Name: Link State Routing
Area Name: Routing Area
Session Requester: Acee Lindem

Meeting Type: Virtual Meeting

Session 1:

Date: 2020-04-02
Start Time: 09:00 America/New_York
Duration: 00:00
Remote Participation Information: LSR WG WebEx
Agenda Note: 

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



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The Link State Routing (lsr) Working Group will hold
a virtual interim meeting on 2020-04-02 from 09:00 to 12:00 America/New_York.

Agenda:
TBD 

Information about remote participation:
https://ietf.webex.com/meet/lsr


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From: Alvaro Retana 
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Date: Thu, 19 Mar 2020 14:48:26 -0700
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To: "draft-ietf-isis-mpls-elc@ietf.org" , Peter Psenak 
Cc: "Acee Lindem (acee)" , "lsr@ietf.org" ,  "lsr-chairs@ietf.org" 
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Subject: Re: [Lsr] AD Review of draft-ietf-isis-mpls-elc-10
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On March 16, 2020 at 7:52:18 AM, Peter Psenak wrote:


Peter:

Hi!

> Let's first close the ISIS ELC draft before starting to work on OSPF
> one, as many comments are common and will be applicable to both ISIS and
> OSPF variants.

Sure, that makes sense.

> Please see inline (##PP):

I replied to some of your comments inline as well.

The only change that I still want to see (based on your answers) is
related to (at least) referencing rfc8662 in =C2=A75 (see below).


Thanks!

Alvaro.


...
> > 116 3. Advertising ELC Using IS-IS
> >
> > 118 Even though ELC is a property of the node, in some cases it is
> > 119 advantageous to associate and advertise the ELC with a prefix. In a
> > 120 multi-area network, routers may not know the identity of the prefix
> > 121 originator in a remote area, or may not know the capabilities of su=
ch
> > 122 originator. Similarly in a multi-domain network, the identity of th=
e
> > 123 prefix originator and its capabilities may not be known to the
> > 124 ingress LSR.
> >
> > [minor] Is there a difference that are you trying to highlight between
> > multi-area and multi-domain? The last two sentences seem redundant to
> > me; using "domain" should be enough.
>
> ##PP
> Multi-area and multi-domain are two different cases. I believe it is
> important to keep both in the text.

Ok...no big deal. =C2=A0I mentioned it because this is the only place in
the document where anything about area/domain is mentioned. =C2=A0If there
are important differences, then it might be useful for other readers
to understand what that is.



> > 126 One bit of the "Bit Values for Prefix Attribute Flags Sub-TLV"
> > 127 registry defined in [RFC7794] (Bit 3 is desired) is to be assigned =
by
> > 128 the IANA for the ELC. If a router has multiple line cards, the
> > 129 router MUST NOT announce the ELC for any prefixes that are locally
> > 130 attached unless all of its line-cards are capable of processing ELs=
.
> > 131 If a router supports ELs on all of its line-cards, it SHOULD set th=
e
> > 132 ELC for every local host prefix it advertises in IS-IS.
...
> > [major] "it SHOULD set the ELC for every local host prefix" If ELs
> > are supported in all the interfaces, when would a router not set the
> > ELC? IOW, why is "MUST" not used instead of "SHOULD"?
>
> ##PP
> advertising ELC is not a MUST. It's an optional information that the
> originator should advertise, but if it is not, it is not going to break
> anything really.

Yes, I understand that the advertisement of ELC is optional.

This document talks about the behavior when the advertisement is
enabled (or configured or ...). =C2=A0IOW, if a router is going to
advertise, when would it not set the ELC?



...
> > 161 5. Advertising ERLD Using IS-IS
> >
> > [major] draft-ietf-mpls-spring-entropy-label says that "To advertise
> > an ERLD value, a SPRING router: MUST be entropy label capable". This
> > requirement must be translated to this document so that the ERLD is
> > only advertised if the ELC is also advertised. I'm assuming that the
> > ERLD should be ignored if the ELC is not advertised -- but that should
> > be explicitly defined as well. If the ELC is advertised, but the ERLD
> > isn't, what value should be assumed, 0?
>
>
> ##PP
> RFC8662 already set the rules on when the ERLD can be advertised and
> that behavior is orthogonal to protocol which is being used to advertise
> the ERLD/ELC.
>
> Same in terms of what should be assumed when the ELC is advertised, but
> ERLD is not - has nothing to do with the advertising protocol - should
> be specified in RFC8662
>
> I don't feel any of the above should be specified in the IGP ELC drafts.

Can you at least put a reference to rfc8662 somewhere in this section?
=C2=A0Something along the lines of "the considerations for advertising the
ERLD are specified in rfc8662".




> > 163 A new MSD-type of the Node MSD ((Maximum SID Depth) sub-TLV
> > 164 [RFC8491], called ERLD is defined to advertise the ERLD of a given
> > 165 router. As shown in Figure 2, it is formatted as described in
> > 166 [RFC8491] with a new MSD-Type code to be assigned by IANA (the type
> > 167 code of 2 is desired) and the Value field is set to the ERLD in the
> > 168 range between 0 to 255. The scope of the advertisement depends on
> > 169 the application. If a router has multiple line-cards with different
> > 170 capabilities of reading the maximum label stack depth, the router
> > 171 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. ;-)
>
> ##PP
> changed to:
>
> "A new MSD-type , called ERLD is defined to
> advertise the ERLD of a given router"

It was just a minor point, but you didn't actually change anything. ;-)

The point was that the MSD-type and the ERLD have the same name, so if
you just say "ERLD" it is not straight forward to figure out if you're
talking about the ERLD or the MSD with the same name.



...
> > 215 Incorrectly setting of the ERLD value may lead to poor load-balanci=
ng
> > 216 of the traffic.
> >
> > [minor] "may lead to poor load-balancing" If the ERLD is low, then
> > the traffic may not be load balanced at all...that is not "poor", it
> > is "0".
>
> ##PP
> would "lead to poor or no load-balancing" be good enough?

Yes.


From nobody Thu Mar 19 19:41:00 2020
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To: Alvaro Retana , "draft-ietf-isis-mpls-elc@ietf.org" 
Cc: "Acee Lindem (acee)" , "lsr@ietf.org" , "lsr-chairs@ietf.org" 
References:  <6bd667d8-6957-894e-f11e-aa727065190c@cisco.com> 
From: Peter Psenak 
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Date: Fri, 20 Mar 2020 11:04:36 +0100
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Subject: Re: [Lsr] AD Review of draft-ietf-isis-mpls-elc-10
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Hi Alvaro,

please see inline (##PP2):

On 19/03/2020 22:48, Alvaro Retana wrote:
> On March 16, 2020 at 7:52:18 AM, Peter Psenak wrote:
> 
> 
> Peter:
> 
> Hi!
> 
>> Let's first close the ISIS ELC draft before starting to work on OSPF
>> one, as many comments are common and will be applicable to both ISIS and
>> OSPF variants.
> 
> Sure, that makes sense.
> 
>> Please see inline (##PP):
> 
> I replied to some of your comments inline as well.
> 
> The only change that I still want to see (based on your answers) is
> related to (at least) referencing rfc8662 in §5 (see below).
> 
> 
> Thanks!
> 
> Alvaro.
> 
> 
> ...
>>> 116 3. Advertising ELC Using IS-IS
>>>
>>> 118 Even though ELC is a property of the node, in some cases it is
>>> 119 advantageous to associate and advertise the ELC with a prefix. In a
>>> 120 multi-area network, routers may not know the identity of the prefix
>>> 121 originator in a remote area, or may not know the capabilities of such
>>> 122 originator. Similarly in a multi-domain network, the identity of the
>>> 123 prefix originator and its capabilities may not be known to the
>>> 124 ingress LSR.
>>>
>>> [minor] Is there a difference that are you trying to highlight between
>>> multi-area and multi-domain? The last two sentences seem redundant to
>>> me; using "domain" should be enough.
>>
>> ##PP
>> Multi-area and multi-domain are two different cases. I believe it is
>> important to keep both in the text.
> 
> Ok...no big deal.  I mentioned it because this is the only place in
> the document where anything about area/domain is mentioned.  If there
> are important differences, then it might be useful for other readers
> to understand what that is.
> 
> 
> 
>>> 126 One bit of the "Bit Values for Prefix Attribute Flags Sub-TLV"
>>> 127 registry defined in [RFC7794] (Bit 3 is desired) is to be assigned by
>>> 128 the IANA for the ELC. If a router has multiple line cards, the
>>> 129 router MUST NOT announce the ELC for any prefixes that are locally
>>> 130 attached unless all of its line-cards are capable of processing ELs.
>>> 131 If a router supports ELs on all of its line-cards, it SHOULD set the
>>> 132 ELC for every local host prefix it advertises in IS-IS.
> ...
>>> [major] "it SHOULD set the ELC for every local host prefix" If ELs
>>> are supported in all the interfaces, when would a router not set the
>>> ELC? IOW, why is "MUST" not used instead of "SHOULD"?
>>
>> ##PP
>> advertising ELC is not a MUST. It's an optional information that the
>> originator should advertise, but if it is not, it is not going to break
>> anything really.
> 
> Yes, I understand that the advertisement of ELC is optional.
> 
> This document talks about the behavior when the advertisement is
> enabled (or configured or ...).  IOW, if a router is going to
> advertise, when would it not set the ELC?

##PP2
The text in draft says:

"If a router has multiple interfaces, the router MUST NOT announce the 
ELC for any local host prefixes unless all of its interfaces are capable 
of processing ELs."

So if there is at least 1 interface (LC really) that is not supporting 
ELC, the router would not send it.


> 
> 
> 
> ...
>>> 161 5. Advertising ERLD Using IS-IS
>>>
>>> [major] draft-ietf-mpls-spring-entropy-label says that "To advertise
>>> an ERLD value, a SPRING router: MUST be entropy label capable". This
>>> requirement must be translated to this document so that the ERLD is
>>> only advertised if the ELC is also advertised. I'm assuming that the
>>> ERLD should be ignored if the ELC is not advertised -- but that should
>>> be explicitly defined as well. If the ELC is advertised, but the ERLD
>>> isn't, what value should be assumed, 0?
>>
>>
>> ##PP
>> RFC8662 already set the rules on when the ERLD can be advertised and
>> that behavior is orthogonal to protocol which is being used to advertise
>> the ERLD/ELC.
>>
>> Same in terms of what should be assumed when the ELC is advertised, but
>> ERLD is not - has nothing to do with the advertising protocol - should
>> be specified in RFC8662
>>
>> I don't feel any of the above should be specified in the IGP ELC drafts.
> 
> Can you at least put a reference to rfc8662 somewhere in this section?
>   Something along the lines of "the considerations for advertising the
> ERLD are specified in rfc8662".

##PP2
done

> 
> 
> 
> 
>>> 163 A new MSD-type of the Node MSD ((Maximum SID Depth) sub-TLV
>>> 164 [RFC8491], called ERLD is defined to advertise the ERLD of a given
>>> 165 router. As shown in Figure 2, it is formatted as described in
>>> 166 [RFC8491] with a new MSD-Type code to be assigned by IANA (the type
>>> 167 code of 2 is desired) and the Value field is set to the ERLD in the
>>> 168 range between 0 to 255. The scope of the advertisement depends on
>>> 169 the application. If a router has multiple line-cards with different
>>> 170 capabilities of reading the maximum label stack depth, the router
>>> 171 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. ;-)
>>
>> ##PP
>> changed to:
>>
>> "A new MSD-type , called ERLD is defined to
>> advertise the ERLD of a given router"
> 
> It was just a minor point, but you didn't actually change anything. ;-)
> 
> The point was that the MSD-type and the ERLD have the same name, so if
> you just say "ERLD" it is not straight forward to figure out if you're
> talking about the ERLD or the MSD with the same name.

##PP2
my bad I pasted a wrong text in my email response. Here's what I have in 
the draft now:

"A new MSD-type , called ERLD-MSD is defined to
advertise the ERLD of a given router. A MSD-Type code 2 has been 
assigned by IANA for EARLD-MSD. MSD-Value field is set to the ERLD in 
the range between 0 to 255."

Sounds good?

thanks,
Peter

> 
> 
> 
> ...
>>> 215 Incorrectly setting of the ERLD value may lead to poor load-balancing
>>> 216 of the traffic.
>>>
>>> [minor] "may lead to poor load-balancing" If the ERLD is low, then
>>> the traffic may not be load balanced at all...that is not "poor", it
>>> is "0".
>>
>> ##PP
>> would "lead to poor or no load-balancing" be good enough?
> 
> Yes.
> 
> 


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From: Alvaro Retana 
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To: "draft-ietf-isis-mpls-elc@ietf.org" , Peter Psenak 
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On March 20, 2020 at 6:04:41 AM, Peter Psenak wrote:


> please see inline (##PP2):

We're good to go.


The only comment from the original review that you didn't reply to is this:

=C2=A0 =C2=A0Besides the in-line comments, I want to point out here that th=
is
=C2=A0 =C2=A0specification is incomplete. =C2=A0It needs to have (1) a form=
al description of
=C2=A0 =C2=A0the new MSD-Type (similar to =C2=A75/rfc8491), and (2) a discu=
ssion of the
=C2=A0 =C2=A0interaction with the BMI-MSD.

...but I'm assuming you're addressing it in the new text. =C2=A0Pointing it
out just in case.


Thanks!!

Alvaro.


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To: Alvaro Retana , "draft-ietf-isis-mpls-elc@ietf.org" 
Cc: "Acee Lindem (acee)" , "lsr@ietf.org" , "lsr-chairs@ietf.org" 
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From: Peter Psenak 
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Hi Alvaro,

On 20/03/2020 11:13, Alvaro Retana wrote:
> On March 20, 2020 at 6:04:41 AM, Peter Psenak wrote:
> 
> 
>> please see inline (##PP2):
> 
> We're good to go.
> 
> 
> The only comment from the original review that you didn't reply to is this:
> 
>     Besides the in-line comments, I want to point out here that this
>     specification is incomplete.  It needs to have (1) a formal description of
>     the new MSD-Type (similar to §5/rfc8491), and (2) a discussion of the
>     interaction with the BMI-MSD.

sorry, I missed it.

Entropy Readable Label Depth is defined in rfc8662.

I have modified the text as foolows:

"A new MSD-type [RFC8491], called ERLD-MSD is defined to
advertise the ERLD [RFC8662] of a given router. A MSD-Type code 2
has been assigned by IANA for EARLD-MSD."

Would that be good enough?

thanks,
Peter



> 
> ...but I'm assuming you're addressing it in the new text.  Pointing it
> out just in case.
> 
> 
> Thanks!!
> 
> Alvaro.
> 
> 


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From: Alvaro Retana 
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References:  <6bd667d8-6957-894e-f11e-aa727065190c@cisco.com>  <0d9b6c73-d309-d2ee-15e0-722df9c32629@cisco.com>  
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Date: Fri, 20 Mar 2020 03:59:02 -0700
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To: "draft-ietf-isis-mpls-elc@ietf.org" , Peter Psenak 
Cc: "Acee Lindem (acee)" , "lsr@ietf.org" ,  "lsr-chairs@ietf.org" 
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Subject: Re: [Lsr] AD Review of draft-ietf-isis-mpls-elc-10
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On March 20, 2020 at 6:22:38 AM, Peter Psenak wrote:


...
> > Besides the in-line comments, I want to point out here that this
> > specification is incomplete. It 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.
>
> sorry, I missed it.
>
> Entropy Readable Label Depth is defined in rfc8662.
>
> I have modified the text as foolows:
>
> "A new MSD-type [RFC8491], called ERLD-MSD is defined to
> advertise the ERLD [RFC8662] of a given router. A MSD-Type code 2
> has been assigned by IANA for EARLD-MSD."
>
> Would that be good enough?

Not quite. =C2=A0According to rfc8662, when a new MSD is defined, the
document MUST indicate the meaning of the absence of the MSD
advertisement. =C2=A0For example, it says this about the BMI-MSD: "The
absence of BMI-MSD advertisements indicates only that the advertising
node does not support advertisement of this capability."


Also, I need you to talk about the interaction between ERLD-MSD and
BMI-MSD. =C2=A0If both are present, what should happen? =C2=A0Should one ta=
ke
precedence, should both be ignored, can they coexist without issues???


Thanks!

Alvaro.


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To: Alvaro Retana , "draft-ietf-isis-mpls-elc@ietf.org" 
Cc: "Acee Lindem (acee)" , "lsr@ietf.org" , "lsr-chairs@ietf.org" 
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From: Peter Psenak 
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On 20/03/2020 11:59, Alvaro Retana wrote:
> On March 20, 2020 at 6:22:38 AM, Peter Psenak wrote:
> 
> 
> ...
>>> Besides the in-line comments, I want to point out here that this
>>> specification is incomplete. It needs to have (1) a formal description of
>>> the new MSD-Type (similar to §5/rfc8491), and (2) a discussion of the
>>> interaction with the BMI-MSD.
>>
>> sorry, I missed it.
>>
>> Entropy Readable Label Depth is defined in rfc8662.
>>
>> I have modified the text as foolows:
>>
>> "A new MSD-type [RFC8491], called ERLD-MSD is defined to
>> advertise the ERLD [RFC8662] of a given router. A MSD-Type code 2
>> has been assigned by IANA for EARLD-MSD."
>>
>> Would that be good enough?
> 
> Not quite.  According to rfc8662, when a new MSD is defined, the
> document MUST indicate the meaning of the absence of the MSD
> advertisement.  For example, it says this about the BMI-MSD: "The
> absence of BMI-MSD advertisements indicates only that the advertising
> node does not support advertisement of this capability."

ok, I  will add that.

> 
> 
> Also, I need you to talk about the interaction between ERLD-MSD and
> BMI-MSD.  If both are present, what should happen?  Should one take
> precedence, should both be ignored, can they coexist without issues???

how are BMI-MSD and EARLD-MSD related?

BMI-MSD signals the total number of MPLS labels that can be imposed.

EARLD-MSD - is defined as the number of labels a router can both:

    a.  Read in an MPLS packet received on its incoming interface(s)
        (starting from the top of the stack).

    b.  Use in its load-balancing function.

I don't really see why one would affect the other.

thanks,
Peter

> 
> 
> Thanks!
> 
> Alvaro.
> 
> 


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From: "Acee Lindem (acee)" 
To: "Peter Psenak (ppsenak)" , Alvaro Retana , "draft-ietf-isis-mpls-elc@ietf.org" 
CC: "lsr@ietf.org" , "lsr-chairs@ietf.org" 
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To: "Acee Lindem (acee)" , "Peter Psenak (ppsenak)" ,  "draft-ietf-isis-mpls-elc@ietf.org" 
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=C2=A0On March 20, 2020 at 10:27:55 AM, Acee Lindem wrote:

=E2=80=A6
> > I don't really see why one would affect the other.
>
> I agree. BMI-MSD is an egress capability and ERLD-MSD is an ingress
> capability. While they may be related in the internal ASIC implementation=
,
> they are independent from a capability perspective.

Please write that then.

They don=E2=80=99t have to affect each other, if they don=E2=80=99t then th=
at=E2=80=99s great!

Alvaro.


From nobody Fri Mar 20 07:37:22 2020
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To: Alvaro Retana , "Acee Lindem (acee)" , "draft-ietf-isis-mpls-elc@ietf.org" 
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From: Peter Psenak 
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Hi Alvaro,

On 20/03/2020 15:30, Alvaro Retana wrote:
>   On March 20, 2020 at 10:27:55 AM, Acee Lindem wrote:
> 
> …
>>> I don't really see why one would affect the other.
>>
>> I agree. BMI-MSD is an egress capability and ERLD-MSD is an ingress
>> capability. While they may be related in the internal ASIC implementation,
>> they are independent from a capability perspective.
> 
> Please write that then.

there are many MSDs defined already, are we going to write that the new 
MSD type is not interacting with any other MSD each time we define a new 
one?

For me it's implicit, if the text does not say anything, there is no 
interaction.

thanks,
Peter

> 
> They don’t have to affect each other, if they don’t then that’s great!
> 
> Alvaro.
> 
> 


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From: Alvaro Retana 
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To: "Acee Lindem (acee)" , Peter Psenak ,  "draft-ietf-isis-mpls-elc@ietf.org" 
Cc: "lsr@ietf.org" , "lsr-chairs@ietf.org" 
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Subject: Re: [Lsr] AD Review of draft-ietf-isis-mpls-elc-10
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On March 20, 2020 at 10:34:59 AM, Peter Psenak wrote:


Peter:


> >>> I don't really see why one would affect the other.
> >>
> >> I agree. BMI-MSD is an egress capability and ERLD-MSD is an ingress
> >> capability. While they may be related in the internal ASIC implementat=
ion,
> >> they are independent from a capability perspective.
> >
> > Please write that then.
>
> there are many MSDs defined already, are we going to write that the new
> MSD type is not interacting with any other MSD each time we define a new
> one?

Yes, when they could be related, we are. =C2=A0More importantly, the reason
why the will not interact, which is what Acee=E2=80=99s text points to.

BTW, according to the registry there are only 2 MSDs defined:
https://www.iana.org/assignments/igp-parameters/igp-parameters.xhtml#igp-ms=
d-types


Alvaro.


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Subject: [Lsr] I-D Action: draft-ietf-isis-te-app-12.txt
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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-12.txt
	Pages           : 21
	Date            : 2020-03-21

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-12
https://datatracker.ietf.org/doc/html/draft-ietf-isis-te-app-12

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-isis-te-app-12


Please note that it may take a couple of minutes from the time of submission
until the htmlized version and diff are available at tools.ietf.org.

Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/



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From: "Les Ginsberg (ginsberg)" 
To: Alvaro Retana , "Acee Lindem (acee)" , "draft-ietf-isis-te-app@ietf.org" 
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From nobody Mon Mar 23 02:16:49 2020
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To: Alvaro Retana , "Acee Lindem (acee)" , "draft-ietf-isis-mpls-elc@ietf.org" 
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From: Peter Psenak 
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Date: Mon, 23 Mar 2020 10:16:42 +0100
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Subject: Re: [Lsr] AD Review of draft-ietf-isis-mpls-elc-10
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Hi Alavaro,

On 20/03/2020 19:23, Alvaro Retana wrote:
> On March 20, 2020 at 10:34:59 AM, Peter Psenak wrote:
> 
> 
> Peter:
> 
> 
>>>>> I don't really see why one would affect the other.
>>>>
>>>> I agree. BMI-MSD is an egress capability and ERLD-MSD is an ingress
>>>> capability. While they may be related in the internal ASIC implementation,
>>>> they are independent from a capability perspective.
>>>
>>> Please write that then.
>>
>> there are many MSDs defined already, are we going to write that the new
>> MSD type is not interacting with any other MSD each time we define a new
>> one?
> 
> Yes, when they could be related, we are.  More importantly, the reason
> why the will not interact, which is what Acee’s text points to.

honestly I do not see a reason to say that they do not interact. Because 
if I use your logic I would have to mention hundred other node 
capabilities that ERLD-MSD is not interacting with. My logic is that if 
something interacts it needs to be specified, if it does not, it does 
not need to be.

> 
> BTW, according to the registry there are only 2 MSDs defined:
> https://www.iana.org/assignments/igp-parameters/igp-parameters.xhtml#igp-msd-types

there are more defined for SRv6 - draft-ietf-lsr-isis-srv6-extensions-06.

thanks,
Peter


> 
> 
> Alvaro.
> 
> 


From nobody Mon Mar 23 07:29:46 2020
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Subject: [Lsr] I-D Action: draft-ietf-lsr-isis-srv6-extensions-07.txt
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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-07.txt
	Pages           : 25
	Date            : 2020-03-23

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-07
https://datatracker.ietf.org/doc/html/draft-ietf-lsr-isis-srv6-extensions-07

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-lsr-isis-srv6-extensions-07


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/



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From: "Acee Lindem (acee)" 
To: "Peter Psenak (ppsenak)" , Alvaro Retana , "draft-ietf-isis-mpls-elc@ietf.org" 
CC: "lsr@ietf.org" , "lsr-chairs@ietf.org" 
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From: Peter Psenak 
To: Christian Hopps , draft-ietf-lsr-isis-srv6-extensions@ietf.org
Cc: lsr@ietf.org
References: <158322928375.7881.1804477928718391946@ietfa.amsl.com> <5562D2CA-D4CB-4804-8795-F69E51FFEB97@chopps.org> <11dfac85-acb3-766e-8fd3-20215e10a8d4@cisco.com>
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Subject: Re: [Lsr] bad xrefs [Re: I-D Action: draft-ietf-lsr-isis-srv6-extensions-06.txt]
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Hi Chris,

cross-references have been fixed in the 07 version that has been posted 
today.

thanks,
Peter



On 09/03/2020 11:39, Peter Psenak wrote:
> Hi Chris,
> 
> you are right, there are some errors in cross-references, I'll fix them
> in next version.
> 
> thanks,
> Peter
> 
> 
> 
> On 07/03/2020 15:17, Christian Hopps wrote:
>> I'm finding cross-references in this document to be incorrect, is something wrong with the XML to foo generation?
>>
>> For example:
>>
>> Section 7.2 says sub-TLVs are defined in Section 6 (Advertising Anycast Property) which I think is supposed to be Section 8 (Advertising SRv6 Adjacency SIDs)
>>
>> Section 7.2, 8.1, 8.2 Endpoint Behavior references Section 9 (SRv6 SID Structure Sub-Sub-TLV) which I think is supposed to be Section 10 (Advertising Endpoint Behaviors)
>>
>> I have other comments but I'll send those separately.
>>
>> Thanks,
>> Chris.
>>
>>> On Mar 3, 2020, at 4:54 AM, 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-06.txt
>>> 	Pages           : 25
>>> 	Date            : 2020-03-03
>>>
>>> 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-06
>>> https://datatracker.ietf.org/doc/html/draft-ietf-lsr-isis-srv6-extensions-06
>>>
>>> A diff from the previous version is available at:
>>> https://www.ietf.org/rfcdiff?url2=draft-ietf-lsr-isis-srv6-extensions-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/
>>>
>>>
>>> _______________________________________________
>>> I-D-Announce mailing list
>>> I-D-Announce@ietf.org
>>> https://www.ietf.org/mailman/listinfo/i-d-announce
>>> Internet-Draft directories: http://www.ietf.org/shadow.html
>>> or ftp://ftp.ietf.org/ietf/1shadow-sites.txt
>>>
>>
>>
>>
> 
> 
> 


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From: Peter Psenak 
To: Christian Hopps , Peter Psenak 
Cc: draft-ietf-lsr-isis-srv6-extensions@ietf.org, lsr@ietf.org
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Subject: Re: [Lsr] "Legal" endpoint behaviors [draft-ietf-lsr-isis-srv6-extensions-06.txt]
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Hi Chris,

On 10/03/2020 11:10, Peter Psenak wrote:

>>
>> What's wrong with "If this behavior is advertised it MUST only be advertised in the TLV[s] as indicated by "Y" in the table below, and MUST NOT be advertised in the TLV[s] as indicated by "N" in the table below." or something like that.\
> 
> sure, I can update the text as above.

your proposed text has been added to the 07 version that has been posted 
today.

thanks,
Peter


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From: Chris Bowers 
Date: Mon, 23 Mar 2020 11:39:44 -0500
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To: Peter Psenak 
Cc: "Ketan Talaulikar (ketant)" , "lsr@ietf.org" , SPRING WG List ,  Bruno Decraene 
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Subject: Re: [Lsr] clarification of locator block and locator node in draft-ietf-spring-srv6-network-programming and draft-ietf-lsr-isis-srv6-extensions
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Peter,

The proposed SRv6 SID Structure Sub-Sub-TLV has several problems.

1) As discussed in item#3 below, it is not clear that flooding LB Length,
LN Length, Fun. Length, and Arg. Length to all ISIS speakers is really the
right approach.  However, if the WG determines that it is the right
approach, the current encodings of this information in the proposed SRv6
SID Structure Sub-Sub-TLV are problematic.  As discussed earlier in this
thread, a network operator may choose to not allocate all locators from a
single block, so LB Length and LN Length may not be well-defined.  The
current encoding of the SRv6 SID Structure Sub-Sub-TLV makes it difficult
to represent this situation.  The simple thing to do for nodes that don't
have a well-defined value of LB Length and LN Length would be to not
advertise a value for LB Length and LN Length.  However, since the
currently proposed SRv6 SID Structure Sub-Sub-TLV combines LB Length, LN
Length, Fun. Length, and Arg. Length into a single sub-sub-TLV, if a node
wants to advertise values for Fun. Length and Arg. Length, it also has to
advertise values for LB Length and LN Length.  It seems like a better
approach would be to have different sub-sub-TLVs, one for  LB Length and LN
Length, and a separate one for Fun. Length and Arg. Length to be able to
better represent this situation.

2) Now consider the situation where a network operator chooses to allocate
all locators from a single block, so that LB Length and LN Length are
well-defined across the network.  A given node should presumably advertise
its own understanding of LB Length and LN Length.   A given node's
understanding of LB Length and LN Length is a property of the node.  It is
not a property of a given End SID.  The currently proposed SRv6 SID
Structure Sub-Sub-TLV however is carried within each End SID Sub-TLV.  With
the currently proposed encoding, presumably an implementation is expected
to send the exact same values of LB Length and LN Length for all of the End
SIDs that it advertises.  Not only is this inefficient, but it creates the
need for logic to decide what to do when different End SIDs advertised by
the same node carry different values of LB Length and LN Length in their
sub-sub-TLVs.  It seems like a better approach would be for a given node to
advertise its understanding of the value of LB Length and LN Length in a
sub-TLV of the Router Capability TLV.

3) At this point, the only use case that has been proposed for flooding the
LB Length, LN Length, Fun. Length, and Arg. Length to all ISIS speakers is
to make it more convenient for BGP-LS to get those values to an external
controller as part of a topology feed from any ISIS node.  No use case has
been proposed for ISIS speakers themselves to make use of the information.
It seems like a more scalable approach would be to use BGP-LS sessions to
collect the information from the subset of nodes that actually produce the
relevant information.  So far there are no End SIDs defined that are
advertised in ISIS that have a non-zero Arg. Length.  If an End SID with
non-zero Arg. Length were to be proposed in the future as needing to be
flooded to all ISIS nodes, it seems likely that the new End SID would also
be advertised using the BGP IP/VPN/EVPN control plane.   So it seems like a
viable alternative for this hypothetical future End SID would be to have
the subset of nodes that have non-zero Arg. Length values communicate to an
external controller via  BGP sessions. I think the WG needs a more detailed
discussion of a concrete use case in order to determine whether flooding LB
Length, LN Length, Fun. Length, and Arg. Length to all ISIS speakers is
really the right approach.

Given the lack of a compelling use case for flooding LB Length, LN Length,
Fun. Length, and Arg. Length to all ISIS speakers and the problems with the
currently proposed encodings for doing that, I think that the SRv6 SID
Structure Sub-Sub-TLV should be removed from
draft-ietf-lsr-isis-srv6-extensions. A mechanism for flooding LB Length, LN
Length, Fun. Length, and Arg. Length to all ISIS speakers can be defined in
a future document.

Thanks,
Chris

On Fri, Mar 13, 2020 at 5:02 AM Peter Psenak  wrote:

> Hi Chris,
>
> On 12/03/2020 15:58, Chris Bowers wrote:
> > Peter,
> >
> > I think that the SRv6 SID Structure Sub-Sub-TLV should be removed from
> > draft-ietf-lsr-isis-srv6-extensions.  I think that we should leave the
> > ability to include sub-sub-TLVs in the SRv6 End SID Sub-TLV, End.X SID
> > Sub-TLV, and LAN End.X SID Sub-TLV in the encodings for those sub-TLVs.
> >
> > I don't think that the current text describing the SRv6 SID Structure
> > Sub-Sub-TLV would result in interoperable implementations.  Based on th=
e
>
> SRv6 base spec defines SID B, L, A, F.
>
> SRv6 protocol specs are advertising these values with the SRv6 SID, they
> don't use them. The usage is outside of the scope of the protocol
> drafts. What exactly is the problem?
>
> thanks,
> Peter
>
>
> > discussion with Ketan below, it appears that use cases for ISIS speaker=
s
> > receiving advertised values of LB Length, LN Length, Fun. Length, and
> > Arg. Length are not currently well-defined.    So I think it makes sens=
e
> > to defer the definition of the SRv6 SID Structure Sub-Sub-TLV to a
> > future document.
> >
> > Thanks,
> > Chris
> >
> > On Thu, Mar 12, 2020 at 6:02 AM Ketan Talaulikar (ketant)
> > > wrote:
> >
> >     Hi Chris,____
> >
> >     __ __
> >
> >     Dropping the draft-ietf-spring-srv6-network-programming authors
> >     since we are now back to discussing the ISIS extensions.____
> >
> >     __ __
> >
> >     Please check inline below.____
> >
> >     __ __
> >
> >     *From:*Chris Bowers  >     >
> >     *Sent:* 05 March 2020 21:53
> >     *To:* Ketan Talaulikar (ketant)  >     >
> >     *Cc:* Ketan Talaulikar (ketant)  >     >; lsr@ietf.org ;
> >     SPRING WG List >;
> >     draft-ietf-spring-srv6-network-programming
> >      >     >; Pete=
r
> >     Psenak (ppsenak) >;
> >     Bruno Decraene  >     >
> >     *Subject:* Re: [Lsr] clarification of locator block and locator nod=
e
> >     in draft-ietf-spring-srv6-network-programming and
> >     draft-ietf-lsr-isis-srv6-extensions____
> >
> >     __ __
> >
> >     Ketan,____
> >
> >     __ __
> >
> >     See inline [CB].____
> >
> >     __ __
> >
> >     On Wed, Mar 4, 2020 at 12:36 AM Ketan Talaulikar (ketant)
> >     > wrote:____
> >
> >         Hi Chris,____
> >
> >         ____
> >
> >         You are right in that there is no assumption that all SRv6
> >         locators in a domain are allocated from the same block.
> >         Therefore knowing the blocks used in the domain is useful.____
> >
> >     ____
> >
> >     [CB] Since you refer to "blocks" (plural) in this sentence, are you
> >     saying that in the scenario where all SRv6 locators in a domain are
> >     not allocated from the same block, you would expect different
> >     routers in the same domain to advertise different values of B and N=
?
> >     ____
> >
> >     */[KT] While personally I believe it would not be the usual case, i=
t
> >     is left to the operator.____/*
> >
> >     */__ __/*
> >
> >     For example, assume we have a network where all SRv6 locators in a
> >     domain are not allocated from the same block.  Router A advertises
> >     an SRv6 Locator TLV with locator =3D 2000::/64, and an SRv6 End SID
> >     sub-TLV with some endpoint behavior. Router B advertises an SRv6
> >     Locator TLV with locator =3D 3000::/64, and an SRv6 End SID sub-TLV
> >     with some endpoint behavior. What should routers A and B advertise
> >     as the values of B and N in their SRv6 SID Structure Sub-Sub-TLVs
> ?____
> >
> >     */[KT] It is difficult for me to figure out what the block and node
> >     parts are with such an addressing./*____
> >
> >     ____
> >
> >         ____
> >
> >         The IGP drafts covers the advertisement of the B and N parts of
> >         the locally configured locator on the node via IGPs. On the
> >         receiver side, the IGP may not really do much with this
> >         information, however it enables propagation of this information
> >         from all nodes in the network to be advertised out via BGP-LS
> >         (or other mechanisms) as part of the topology feed. Once this i=
s
> >         part of the topology feed, it enables use-cases on controllers
> >         to perform network wide validation of the SRv6 SID block
> >         provisioning and can also help in automation of the security
> >         aspects described in
> >
> https://tools.ietf.org/html/draft-ietf-6man-segment-routing-header-26#sec=
tion-5____
> >
> >         ____
> >
> >     [CB] If an ISIS speaker is not expected to do anything with B and N=
,
> >     then I think the text in draft-ietf-lsr-isis-srv6-extensions needs
> >     to clarify this.  I have a similar observation about Fun. Length an=
d
> >     Arg. Length in the SRv6 SID Structure Sub-Sub-TLV .  As far as I ca=
n
> >     tell, none of the endpoint behaviors that are currently specified t=
o
> >     be carried in ISIS End, End.X, and LAN End.X SIDs sub-TLVs uses an
> >     Argument, so there is never a case where an SRv6 SID Structure
> >     Sub-Sub-TLV should have a non-zero value for Arg. Length. What
> >     should an ISIS speaker do if it receives a non-zero value of the
> >     Arg. Length for an endpoint behavior that doesn't use an argument?
> >     Are there any use cases envisioned where an ISIS speaker needs to
> >     know the Arg. Length ? ____
> >
> >     */[KT] The behaviors currently listed in the draft do not have an
> >     argument nor is the use of B and N required for them. We cannot
> >     preclude a future use-case or extension where such behaviors
> >     introduced are also applicable to ISIS. So IMHO ruling such aspects
> >     out might not be the right thing to do from a protocol extensibilit=
y
> >     perspective.____/*
> >
> >     */__ __/*
> >
> >     */Thanks,____/*
> >
> >     */Ketan/*____
> >
> >     __ __
> >
> >         Thanks,____
> >
> >         Ketan____
> >
> >         ____
> >
> >         *From:*Chris Bowers  >         >
> >         *Sent:* 02 March 2020 23:39
> >         *To:* Ketan Talaulikar (ketant)  >         >
> >         *Cc:* Ketan Talaulikar (ketant)
> >          >         >; lsr@ietf.org
> >         ; SPRING WG List  >         >;
> >         draft-ietf-spring-srv6-network-programming
> >          >         >;
> >         Peter Psenak (ppsenak)  >         >; Bruno Decraene
> >         >
> >         *Subject:* Re: [Lsr] clarification of locator block and locator
> >         node in draft-ietf-spring-srv6-network-programming and
> >         draft-ietf-lsr-isis-srv6-extensions____
> >
> >         ____
> >
> >         Ketan,____
> >
> >         ____
> >
> >         Based on current documents, allocating all SRv6 locators used i=
n
> >         a domain from a single block is optional.____
> >
> >         ____
> >
> >         However, assuming for the moment that a network operator has
> >         chosen to allocate all SRv6 locators used in a domain from a
> >         single block, so that there is a well-defined value of B and N
> >         across a domain, what is the use of having a router advertise
> >         its own understanding of these two values?  And what is a
> >         receiver supposed to do with this information?____
> >
> >         ____
> >
> >         Thanks,____
> >
> >         Chris____
> >
> >         ____
> >
> >         On Fri, Feb 28, 2020 at 8:23 AM  >         > wrote:____
> >
> >             Hi Ketan,____
> >
> >             ____
> >
> >             Thanks fort the follow up.____
> >
> >             Clarification inline [Bruno]____
> >
> >             ____
> >
> >             *From**:*Ketan Talaulikar (ketant) [mailto:ketant@cisco.com
> >             ]
> >             *Sent:* Friday, February 28, 2020 11:11 AM
> >             *To:* DECRAENE Bruno TGI/OLN; Ketan Talaulikar (ketant);
> >             Chris Bowers
> >             *Cc:* lsr@ietf.org ; SPRING WG List;
> >             draft-ietf-spring-srv6-network-programming; Peter Psenak
> >             (ppsenak)
> >             *Subject:* RE: [Lsr] clarification of locator block and
> >             locator node in draft-ietf-spring-srv6-network-programming
> >             and draft-ietf-lsr-isis-srv6-extensions____
> >
> >             ____
> >
> >             Hi Bruno,____
> >
> >             ____
> >
> >             I believe the description and usage of Locator is very well
> >             described and covered in the net-pgm draft as also the
> >             corresponding IGP extensions. Is the question is more about
> >             the =E2=80=9Cblock=E2=80=9D part of it (what is not in the =
block part is in
> >             the node part as per the text in the net-pgm draft)?____
> >
> >             ____
> >
> >             The =E2=80=9Cblock=E2=80=9D is again not a new thing. Pleas=
e check the
> >             following:____
> >
> >             Under
> >
> https://tools.ietf.org/html/draft-ietf-6man-segment-routing-header-26#sec=
tion-5
> >             =E2=80=A6 look for =E2=80=9Cblock=E2=80=9D____
> >
> >             https://tools.ietf.org/html/rfc8402#section-2 =E2=80=A6 loo=
k under
> >             SRGB for SRv6____
> >
> >             ____
> >
> >             [Bruno]____
> >
> >             To clarify, my question was not specific to =E2=80=9Cblock=
=E2=80=9D but
> >             related to the usage, by the receiver, of the following
> >             piece of information:____
> >
> >             ____
> >
> >                    LB Length: SRv6 SID Locator Block length____
> >
> >                    LN Length: SRv6 SID Locator Node length____
> >
> >                    Fun. Length: SRv6 SID Function length____
> >
> >                    Arg. Length: SRv6 SID Arguments length____
> >
> >             ____
> >
> >             ____
> >
> >             So perhaps I don=E2=80=99t get Chris=E2=80=99s point and wo=
uld wait for him
> >             to clarify.____
> >
> >             [Bruno] I=E2=80=99ll leave this to Chris.____
> >
> >             ____
> >
> >             Thanks,____
> >
> >             Ketan____
> >
> >             ____
> >
> >             *From:*Lsr  >             > *On Behalf Of
> >             *bruno.decraene@orange.com  >
> >             *Sent:* 28 February 2020 14:34
> >             *To:* Ketan Talaulikar (ketant)
> >              >             >; Chris Bowers
> >              chrisbowers.ietf@gmail.com>>
> >             *Cc:* lsr@ietf.org ; SPRING WG List
> >             >;
> >             draft-ietf-spring-srv6-network-programming
> >              >              >>;
> >             Peter Psenak (ppsenak)  >             >
> >             *Subject:* Re: [Lsr] clarification of locator block and
> >             locator node in draft-ietf-spring-srv6-network-programming
> >             and draft-ietf-lsr-isis-srv6-extensions____
> >
> >             ____
> >
> >             Hi Ketan,____
> >
> >             ____
> >
> >             ____
> >
> >             ____
> >
> >             *From:*Lsr [mailto:lsr-bounces@ietf.org] *On Behalf Of
> >             *Ketan Talaulikar (ketant)
> >             *Sent:* Friday, February 28, 2020 6:30 AM____
> >
> >             ____
> >
> >             Hi Chris,____
> >
> >             ____
> >
> >             I agree with Peter and I would suggest to drop LSR since
> >             this is not a protocol specific thing.____
> >
> >             ____
> >
> >             I believe the text in
> >             draft-ietf-spring-srv6-network-programming clears says what
> >             locator block and locator node are. What more details do yo=
u
> >             think are required?____
> >
> >             ____
> >
> >             [Bruno] Speaking as an individual, the draft could possibly
> >             clarify the usage of these information/fields by the
> >             receiver. Possibly using the same name/term (e.g. SRv6 SID
> >             Locator Block length) to ease the references between both
> >             drafts.____
> >
> >             ____
> >
> >             Thanks,____
> >
> >             --Bruno____
> >
> >             ____
> >
> >             Thanks,____
> >
> >             Ketan____
> >
> >             ____
> >
> >             *From:*Lsr  >             > *On Behalf Of *Chris Bowers
> >             *Sent:* 27 February 2020 22:46
> >             *To:* lsr@ietf.org ; SPRING WG List
> >             >
> >             *Cc:* Peter Psenak (ppsenak)  >             >
> >             *Subject:* [Lsr] clarification of locator block and locator
> >             node in draft-ietf-spring-srv6-network-programming and
> >             draft-ietf-lsr-isis-srv6-extensions____
> >
> >             ____
> >
> >             SPRING and LSR WGs,____
> >
> >             ____
> >
> >             I think that we need a much more detailed description of th=
e
> >             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-1=
0
> >                 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 descriptio=
n
> >                 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
> >                  > ____
> >
> >
>  ________________________________________________________________________=
_____________________________________________________
> >
> >             ____
> >
> >             Ce message et ses pieces jointes peuvent contenir des
> >             informations confidentielles ou privilegiees et ne doivent
> donc____
> >
> >             pas etre diffuses, exploites ou copies sans autorisation. S=
i
> >             vous avez recu ce message par erreur, veuillez le
> signaler____
> >
> >             a l'expediteur et le detruire ainsi que les pieces jointes.
> >             Les messages electroniques etant susceptibles
> d'alteration,____
> >
> >             Orange decline toute responsabilite si ce message a ete
> >             altere, deforme ou falsifie. Merci.____
> >
> >             ____
> >
> >             This message and its attachments may contain confidential o=
r
> >             privileged information that may be protected by law;____
> >
> >             they should not be distributed, used or copied without
> >             authorisation.____
> >
> >             If you have received this email in error, please notify the
> >             sender and delete this message and its attachments.____
> >
> >             As emails may be altered, Orange is not liable for messages
> >             that have been modified, changed or falsified.____
> >
> >             Thank you.____
> >
> >
>  ________________________________________________________________________=
_____________________________________________________
> >
> >             ____
> >
> >             Ce message et ses pieces jointes peuvent contenir des
> >             informations confidentielles ou privilegiees et ne doivent
> donc____
> >
> >             pas etre diffuses, exploites ou copies sans autorisation. S=
i
> >             vous avez recu ce message par erreur, veuillez le
> signaler____
> >
> >             a l'expediteur et le detruire ainsi que les pieces jointes.
> >             Les messages electroniques etant susceptibles
> d'alteration,____
> >
> >             Orange decline toute responsabilite si ce message a ete
> >             altere, deforme ou falsifie. Merci.____
> >
> >             ____
> >
> >             This message and its attachments may contain confidential o=
r
> >             privileged information that may be protected by law;____
> >
> >             they should not be distributed, used or copied without
> >             authorisation.____
> >
> >             If you have received this email in error, please notify the
> >             sender and delete this message and its attachments.____
> >
> >             As emails may be altered, Orange is not liable for messages
> >             that have been modified, changed or falsified.____
> >
> >             Thank you.____
> >
>
>

--0000000000007bb29205a1885368
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable


Peter,


The proposed SRv6 SID Structure Sub-Sub-TLV has several problems.
=




1) As discussed in item#3 below, it is not clear that flooding=20
LB Length, LN Length, Fun. Length, and Arg. Length

 to all ISIS speakers is really the right approach.=C2=A0 However, if the W=
G determines that it is the right approach, the current encodings of this i=
nformation in the proposed SRv6 SID Structure Sub-Sub-TLV are problematic.=
=C2=A0 As discussed earlier in this thread, a network operator may choose t=
o not allocate all locators from a single block, so LB Length and LN Length=
 may not be well-defined.=C2=A0 The current encoding of the=20
SRv6 SID Structure Sub-Sub-TLV makes it difficult to represent this situati=
on.=C2=A0 The simple thing to do for nodes that don't have a well-defin=
ed value of
LB Length and LN Length

 would be to not advertise a value for
LB Length and LN Length.=C2=A0 However, since the currently proposed


SRv6 SID Structure Sub-Sub-TLV combines=20
LB Length, LN Length, Fun. Length, and Arg. Length into a single sub-sub-TL=
V, if a node wants to advertise values for Fun. Length and Arg. Length, it =
also has to advertise values for=20
LB Length and LN Length.=C2=A0 It seems like a better approach would be to =
have different sub-sub-TLVs, one for=C2=A0


LB Length and LN Length, and a separate one for Fun. Length and Arg. Length=
 to be able to better represent this situation.



2) Now consider the situation where a=20
network operator chooses to allocate all locators from a single block, so t=
hat LB Length and LN Length are well-defined across the network.=C2=A0 A gi=
ven node should presumably advertise its own understanding of=20
LB Length and LN Length.=C2=A0=C2=A0
A given node's understanding of=20
LB Length and LN Length is a property of the node.=C2=A0 It is not a proper=
ty of a given End SID.=C2=A0 The=20
 currently proposed


SRv6 SID Structure Sub-Sub-TLV however is carried within each End SID Sub-T=
LV.=C2=A0 With the currently proposed encoding, presumably an implementatio=
n is expected to send the exact same values of=20
LB Length and LN Length for all of the End SIDs that it advertises.=C2=A0 N=
ot only is this inefficient, but it creates the need for logic to decide wh=
at to do when different End SIDs advertised by the same node carry differen=
t=20
 values of=20
LB Length and LN Length in their sub-sub-TLVs.=C2=A0 It seems like a better=
 approach would be for a given node to advertise its understanding of the v=
alue of
LB Length and LN Length in a sub-TLV of the Router Capability TLV.




3) At this point, the only use case that has been=
 proposed for flooding the LB Length, LN Length, Fun. Length, and Arg. Leng=
th

 to all ISIS speakers is to make it more convenient for BGP-LS to get those=
 values to an external controller as part of a topology feed from any ISIS =
node.=C2=A0 No use case has been proposed for ISIS speakers themselves to m=
ake use of the information.=C2=A0 It seems like a more scalable approach wo=
uld be to use BGP-LS sessions to collect the information from the subset of=
 nodes that actually produce the relevant information.=C2=A0=20
So far there are no End SIDs defined that are advertised in ISIS that have =
a non-zero Arg. Length.=C2=A0 If an End SID with=20
non-zero Arg. Length were to be proposed in the future as needing to be flo=
oded to all ISIS nodes, it seems likely that the new End SID would also be =
advertised using the BGP IP/VPN/EVPN control plane. =C2=A0 So it seems like=
 a viable alternative for this hypothetical future End SID would be to have=
 the subset of nodes that have non-zero Arg. Length values communicate to a=
n external controller via=C2=A0 BGP sessions. I think the WG needs a more d=
etailed discussion of a concrete use case in order to determine whether flo=
oding=20
LB Length, LN Length, Fun. Length, and Arg. Length

 to all ISIS speakers is really the right approach.

Given the lack of a compelling use case for=20
flooding LB Length, LN Length, Fun. Length, and Arg. Length

 to all ISIS speakers and the problems with the currently proposed encoding=
s for doing that, I think that the SRv6 SID Structure Sub-Sub-TLV should be=
 removed from draft-ietf-lsr-isis-srv6-extensions. A mechanism for flooding=
 LB Length, LN Length, Fun. Length, and Arg. Length

 to all ISIS speakers can be defined in a future document.
Thanks,
Chris

On Fri, Mar 13, 2020 at 5=
:02 AM Peter Psenak <ppsenak@cisco.com> wrote:
Hi Chris,



On 12/03/2020 15:58, Chris Bowers wrote:

> Peter,

> 

> I think that the SRv6 SID Structure Sub-Sub-TLV should be removed from=
 

> draft-ietf-lsr-isis-srv6-extensions.=C2=A0 I think that we should leav=
e the 

> ability to include sub-sub-TLVs in the SRv6 End SID Sub-TLV, End.X SID=
 

> Sub-TLV, and LAN End.X SID Sub-TLV in the encodings for those sub-TLVs=
.

> 

> I don't think that the current text describing the SRv6 SID Struct=
ure 

> Sub-Sub-TLV would result in interoperable implementations.=C2=A0 Based=
 on the



SRv6 base spec defines SID B, L, A, F.



SRv6 protocol specs are advertising these values with the SRv6 SID, they 
don't use them. The usage is outside of the scope of the protocol 

drafts. What exactly is the problem?



thanks,

Peter





> discussion with Ketan below, it appears that use cases for ISIS speake=
rs 

> receiving advertised values of LB Length, LN Length, Fun. Length, and =


> Arg. Length are not currently well-defined. =C2=A0=C2=A0 So I think it=
 makes sense 

> to defer the definition of the SRv6 SID Structure Sub-Sub-TLV to a 
> future document.

> 

> Thanks,

> Chris

> 

> On Thu, Mar 12, 2020 at 6:02 AM Ketan Talaulikar (ketant) 

> <ketant@cisco=
.com <mailto:k=
etant@cisco.com>> wrote:

> 

>=C2=A0 =C2=A0 =C2=A0Hi Chris,____

> 

>=C2=A0 =C2=A0 =C2=A0__ __

> 

>=C2=A0 =C2=A0 =C2=A0Dropping the draft-ietf-spring-srv6-network-program=
ming authors

>=C2=A0 =C2=A0 =C2=A0since we are now back to discussing the ISIS extens=
ions.____

> 

>=C2=A0 =C2=A0 =C2=A0__ __

> 

>=C2=A0 =C2=A0 =C2=A0Please check inline below.____

> 

>=C2=A0 =C2=A0 =C2=A0__ __

> 

>=C2=A0 =C2=A0 =C2=A0*From:*Chris Bowers <chrisbowers.ietf@gmail.com

>=C2=A0 =C2=A0 =C2=A0<mailto:chrisbowers.ietf@gmail.com>>

>=C2=A0 =C2=A0 =C2=A0*Sent:* 05 March 2020 21:53

>=C2=A0 =C2=A0 =C2=A0*To:* Ketan Talaulikar (ketant) <ketant@cisco.com

>=C2=A0 =C2=A0 =C2=A0<mailto:ketant@cisco.com>>

>=C2=A0 =C2=A0 =C2=A0*Cc:* Ketan Talaulikar (ketant) <ketant@cisco.com

>=C2=A0 =C2=A0 =C2=A0<mailto:ketant@cisco.com>>; lsr@ietf.org <mailto:lsr@ietf.org>;

>=C2=A0 =C2=A0 =C2=A0SPRING WG List <spring@ietf.org <mailto:spring@ietf.org>>;

>=C2=A0 =C2=A0 =C2=A0draft-ietf-spring-srv6-network-programming

>=C2=A0 =C2=A0 =C2=A0<draft-ietf-spring-srv6-network-pr=
ogramming@ietf.org

>=C2=A0 =C2=A0 =C2=A0<mailto:draft-ietf-spring-srv6-net=
work-programming@ietf.org>>; Peter

>=C2=A0 =C2=A0 =C2=A0Psenak (ppsenak) <ppsenak@cisco.com <mailto:ppsenak@cisco.com>>;

>=C2=A0 =C2=A0 =C2=A0Bruno Decraene <bruno.decraene@orange.com

>=C2=A0 =C2=A0 =C2=A0<mailto:bruno.decraene@orange.com>>

>=C2=A0 =C2=A0 =C2=A0*Subject:* Re: [Lsr] clarification of locator block=
 and locator node

>=C2=A0 =C2=A0 =C2=A0in draft-ietf-spring-srv6-network-programming and
>=C2=A0 =C2=A0 =C2=A0draft-ietf-lsr-isis-srv6-extensions____

> 

>=C2=A0 =C2=A0 =C2=A0__ __

> 

>=C2=A0 =C2=A0 =C2=A0Ketan,____

> 

>=C2=A0 =C2=A0 =C2=A0__ __

> 

>=C2=A0 =C2=A0 =C2=A0See inline [CB].____

> 

>=C2=A0 =C2=A0 =C2=A0__ __

> 

>=C2=A0 =C2=A0 =C2=A0On Wed, Mar 4, 2020 at 12:36 AM Ketan Talaulikar (k=
etant)

>=C2=A0 =C2=A0 =C2=A0<ketant@cisco.com <mailto:ketant@cisco.com>> wrote:____

> 

>=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=A0 =C2=A0You are right in that there is no ass=
umption that all SRv6

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0locators in a domain are allocated fr=
om the same block.

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Therefore knowing the blocks used in =
the domain is useful.____

> 

>=C2=A0 =C2=A0 =C2=A0____

> 

>=C2=A0 =C2=A0 =C2=A0[CB] Since you refer to "blocks" (plural)=
 in this sentence, are you

>=C2=A0 =C2=A0 =C2=A0saying that in the scenario where all SRv6 locators=
 in a domain are

>=C2=A0 =C2=A0 =C2=A0not allocated from the same block, you would expect=
 different

>=C2=A0 =C2=A0 =C2=A0routers in the same domain to advertise different v=
alues of B and N?

>=C2=A0 =C2=A0 =C2=A0____

> 

>=C2=A0 =C2=A0 =C2=A0*/[KT] While personally I believe it would not be t=
he usual case, it

>=C2=A0 =C2=A0 =C2=A0is left to the operator.____/*

> 

>=C2=A0 =C2=A0 =C2=A0*/__ __/*

> 

>=C2=A0 =C2=A0 =C2=A0For example, assume we have a network where all SRv=
6 locators in a

>=C2=A0 =C2=A0 =C2=A0domain are not allocated from the same block.=C2=A0=
 Router A advertises

>=C2=A0 =C2=A0 =C2=A0an SRv6 Locator TLV with locator =3D 2000::/64, and=
 an SRv6 End SID

>=C2=A0 =C2=A0 =C2=A0sub-TLV with some endpoint behavior. Router B adver=
tises an SRv6

>=C2=A0 =C2=A0 =C2=A0Locator TLV with locator =3D 3000::/64, and an SRv6=
 End SID sub-TLV

>=C2=A0 =C2=A0 =C2=A0with some endpoint behavior. What should routers A =
and B advertise

>=C2=A0 =C2=A0 =C2=A0as the values of B and N in their SRv6 SID Structur=
e Sub-Sub-TLVs ?____

> 

>=C2=A0 =C2=A0 =C2=A0*/[KT] It is difficult for me to figure out what th=
e block and node

>=C2=A0 =C2=A0 =C2=A0parts are with such an addressing./*____

> 

>=C2=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 IGP drafts covers the advertiseme=
nt of the B and N parts of

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0the locally configured locator on the=
 node via IGPs. On the

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0receiver side, the IGP may not really=
 do much with this

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0information, however it enables propa=
gation of this information

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0from all nodes in the network to be a=
dvertised out via BGP-LS

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0(or other mechanisms) as part of the =
topology feed. Once this is

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0part of the topology feed, it enables=
 use-cases on controllers

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0to perform network wide validation of=
 the SRv6 SID block

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0provisioning and can also help in aut=
omation of the security

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0aspects described in

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0https://tools.ietf.org/html/draft-ietf-6man-segment-ro=
uting-header-26#section-5____

> 

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0____

> 

>=C2=A0 =C2=A0 =C2=A0[CB] If an ISIS speaker is not expected to do anyth=
ing with B and N,

>=C2=A0 =C2=A0 =C2=A0then I think the text in draft-ietf-lsr-isis-srv6-e=
xtensions needs

>=C2=A0 =C2=A0 =C2=A0to clarify this.=C2=A0 I have a similar observation=
 about Fun. Length and

>=C2=A0 =C2=A0 =C2=A0Arg. Length in the SRv6 SID Structure Sub-Sub-TLV .=
=C2=A0 As far as I can

>=C2=A0 =C2=A0 =C2=A0tell, none of the endpoint behaviors that are curre=
ntly specified to

>=C2=A0 =C2=A0 =C2=A0be carried in ISIS End, End.X, and LAN End.X SIDs s=
ub-TLVs uses an

>=C2=A0 =C2=A0 =C2=A0Argument, so there is never a case where an SRv6 SI=
D Structure

>=C2=A0 =C2=A0 =C2=A0Sub-Sub-TLV should have a non-zero value for Arg. L=
ength. What

>=C2=A0 =C2=A0 =C2=A0should an ISIS speaker do if it receives a non-zero=
 value of the

>=C2=A0 =C2=A0 =C2=A0Arg. Length for an endpoint behavior that doesn'=
;t use an argument? 

>=C2=A0 =C2=A0 =C2=A0Are there any use cases envisioned where an ISIS sp=
eaker needs to

>=C2=A0 =C2=A0 =C2=A0know the Arg. Length ? ____

> 

>=C2=A0 =C2=A0 =C2=A0*/[KT] The behaviors currently listed in the draft =
do not have an

>=C2=A0 =C2=A0 =C2=A0argument nor is the use of B and N required for the=
m. We cannot

>=C2=A0 =C2=A0 =C2=A0preclude a future use-case or extension where such =
behaviors

>=C2=A0 =C2=A0 =C2=A0introduced are also applicable to ISIS. So IMHO rul=
ing such aspects

>=C2=A0 =C2=A0 =C2=A0out might not be the right thing to do from a proto=
col extensibility

>=C2=A0 =C2=A0 =C2=A0perspective.____/*

> 

>=C2=A0 =C2=A0 =C2=A0*/__ __/*

> 

>=C2=A0 =C2=A0 =C2=A0*/Thanks,____/*

> 

>=C2=A0 =C2=A0 =C2=A0*/Ketan/*____

> 

>=C2=A0 =C2=A0 =C2=A0__ __

> 

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Thanks,____

> 

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Ketan____

> 

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0____

> 

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0*From:*Chris Bowers <chrisbowers.ietf@gmail.c=
om

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0<mailto:chrisbowers.ietf@gmail.com>>=
;

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0*Sent:* 02 March 2020 23:39

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0*To:* Ketan Talaulikar (ketant) <<=
a href=3D"mailto:ketant@cisco.com" target=3D"_blank">ketant@cisco.com
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0<mailto:ketant@cisco.com>>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0*Cc:* Ketan Talaulikar (ketant)

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0<ketant=3D40cisco.com@dmarc.ietf.org

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0<mailto:40cisco..com@dmarc.ietf.org>&=
gt;; lsr@ietf.org

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0<mailto:lsr@ietf.org>; SPRING WG List <spring@ietf.org

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0<mailto:spring@ietf.org>>;

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0draft-ietf-spring-srv6-network-progra=
mming

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0<draft-ietf-spring-s=
rv6-network-programming@ietf.org

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0<mailto:draft-ietf-s=
pring-srv6-network-programming@ietf.org>>;

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Peter Psenak (ppsenak) <ppsenak@cisco.com

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0<mailto:ppsenak@cisco.com>>; Bruno Decraene<=
br>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0<bruno.decraene@orange.com <mailto:bruno.decraene@o=
range.com>>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0*Subject:* Re: [Lsr] clarification of=
 locator block and locator

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0node in draft-ietf-spring-srv6-networ=
k-programming and

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0draft-ietf-lsr-isis-srv6-extensions__=
__

> 

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0____

> 

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Ketan,____

> 

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0____

> 

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Based on current documents, allocatin=
g all SRv6 locators used in

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0a domain from a single block is optio=
nal.____

> 

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0____

> 

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0However, assuming for the moment that=
 a network operator has

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0chosen to allocate all SRv6 locators =
used in a domain from a

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0single block, so that there is a well=
-defined value of B and N

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0across a domain, what is the use of h=
aving a router advertise

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0its own understanding of these two va=
lues?=C2=A0 And what is a

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0receiver supposed to do with this inf=
ormation?____

> 

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0____

> 

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Thanks,____

> 

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Chris____

> 

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0____

> 

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0On Fri, Feb 28, 2020 at 8:23 AM <<=
a href=3D"mailto:bruno.decraene@orange.com" target=3D"_blank">bruno.decraen=
e@orange.com

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0<mailto:bruno.decraene@orange.com>> =
wrote:____

> 

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Hi Ketan,____

> 

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0____

> 

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Thanks fort the follow =
up.____

> 

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Clarification inline [B=
runo]____

> 

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0____

> 

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0*From**:*Ketan Talaulik=
ar (ketant) [mailto:k=
etant@cisco.com

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0<mailto:ketant@cisco.com>]

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0*Sent:* Friday, Februar=
y 28, 2020 11:11 AM

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0*To:* DECRAENE Bruno TG=
I/OLN; Ketan Talaulikar (ketant);

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Chris Bowers

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0*Cc:* lsr@ietf.org <mailto:lsr@ietf.org>; SPRING WG List;
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0draft-ietf-spring-srv6-=
network-programming; Peter Psenak

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0(ppsenak)

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0*Subject:* RE: [Lsr] cl=
arification of locator block and

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0locator node in draft-i=
etf-spring-srv6-network-programming

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0and 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=A0Hi Bruno,____

> 

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0____

> 

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0I believe the descripti=
on and usage of Locator is very well

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0described and covered i=
n the net-pgm draft as also the

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0corresponding IGP exten=
sions. Is the question is more about

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0the =E2=80=9Cblock=E2=
=80=9D part of it (what is not in the block part is in

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0the node part as per th=
e text in the net-pgm draft)?____

> 

>=C2=A0 =C2=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 =E2=80=9Cblock=E2=
=80=9D is again not a new thing. Please check the

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0following:____

> 

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Under

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0https://tools.ietf.org/html/draft-ietf-6man-=
segment-routing-header-26#section-5

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=E2=80=A6 look for =E2=
=80=9Cblock=E2=80=9D____

> 

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0htt=
ps://tools.ietf.org/html/rfc8402#section-2 =E2=80=A6 look under

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0SRGB for SRv6____

> 

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0____

> 

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0[Bruno]____

> 

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0To clarify, my question=
 was not specific to =E2=80=9Cblock=E2=80=9D but

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0related to the usage, b=
y the receiver, of the following

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0piece of information:__=
__

> 

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0____

> 

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0 LB Length: SRv6 SID Locator Block length____

> 

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0 LN Length: SRv6 SID Locator Node length____

> 

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0 Fun. Length: SRv6 SID Function length____

> 

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0 Arg. Length: SRv6 SID Arguments length____

> 

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0____

> 

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0____

> 

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0So perhaps I don=E2=80=
=99t get Chris=E2=80=99s point and would wait for him

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0to clarify.____

> 

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0[Bruno] I=E2=80=99ll le=
ave this to 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 =C2=A0 =C2=A0Thanks,____

> 

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Ketan____

> 

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0____

> 

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0*From:*Lsr <lsr-bounces@ietf.org=


>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0<mailto:lsr-bounces@ietf.org>&=
gt; *On Behalf Of

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0*bruno.decraene@orange.com <=
mailto:bruno=
.decraene@orange.com>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0*Sent:* 28 February 202=
0 14:34

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0*To:* Ketan Talaulikar =
(ketant)

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0<ketant=3D40cisco.com@dmarc.iet=
f.org

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0<mailto:40cisco..com@dmarc.iet=
f.org>>; Chris Bowers

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0<chrisbowers.ietf@gmail.com=
 <mailto:chrisbowers.ietf@gmail.com>>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0*Cc:* lsr@ietf.org <mailto:lsr@ietf.org>; SPRING WG List
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0<spring@ietf.org <mailto:spring@ietf.org>>;

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0draft-ietf-spring-srv6-=
network-programming

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0<draft=
-ietf-spring-srv6-network-programming@ietf.org

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0<mailto:draft-ietf-spring-srv6-network-programming@ietf.org>>;

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Peter Psenak (ppsenak) =
<ppsenak@cisco.co=
m

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0<mailto:ppsenak@cisco.com>>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0*Subject:* Re: [Lsr] cl=
arification of locator block and

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0locator node in draft-i=
etf-spring-srv6-network-programming

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0and 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=A0Hi Ketan,____

> 

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0____

> 

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0____

> 

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0____

> 

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0*From:*Lsr [mailto:lsr-bounces@ietf.org<=
/a>] *On Behalf Of

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0*Ketan Talaulikar (keta=
nt)

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0*Sent:* Friday, Februar=
y 28, 2020 6:30 AM____

> 

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0____

> 

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Hi 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 =C2=A0 =C2=A0I agree with Peter and =
I would suggest to drop LSR since

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0this is not a protocol =
specific thing.____

> 

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0____

> 

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0I believe the text in
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0draft-ietf-spring-srv6-=
network-programming clears says what

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0locator block and locat=
or node are. What more details do you

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0think are required?____=


> 

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0____

> 

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0[Bruno] Speaking as an =
individual, the draft could possibly

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0clarify the usage of th=
ese information/fields by the

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0receiver. Possibly usin=
g the same name/term (e.g. SRv6 SID

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Locator Block length) t=
o ease the references between both

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0drafts.____

> 

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0____

> 

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Thanks,____

> 

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0--Bruno____

> 

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0____

> 

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Thanks,____

> 

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Ketan____

> 

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0____

> 

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0*From:*Lsr <lsr-bounces@ietf.org=


>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0<mailto:lsr-bounces@ietf.org>&=
gt; *On Behalf Of *Chris Bowers

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0*Sent:* 27 February 202=
0 22:46

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0*To:* lsr@ietf.org <mailto:lsr@ietf.org>; SPRING WG List
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0<spring@ietf.org <mailto:spring@ietf.org>>

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0*Cc:* Peter Psenak (pps=
enak) <ppsenak@ci=
sco.com

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0<mailto:ppsenak@cisco.com>>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0*Subject:* [Lsr] clarif=
ication of locator block and locator

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0node in draft-ietf-spri=
ng-srv6-network-programming and

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0draft-ietf-lsr-isis-srv=
6-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=A0SPRING and LSR WGs,____=


> 

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0____

> 

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0I think that we need a =
much more detailed description of the

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0locator block and locat=
or node in either

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0draft-ietf-spring-srv6-=
network-programming or

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0draft-ietf-lsr-isis-srv=
6-extensions.=C2=A0 See original email

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0below.____

> 

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0____

> 

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Thanks,____

> 

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Chris____

> 

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0____

> 

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0On Thu, Feb 27, 2020 at=
 11:08 AM Peter Psenak

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0<ppsenak@cisco.com <mailto:ppsenak@cisco.com>&=
gt; wrote:____

> 

>=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=A0On 27/02/=
2020 17:54, Chris Bowers wrote:

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 > LSR=
 WG,

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

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 > Sec=
tion 9 of draft-ietf-lsr-isis-srv6-extensions-05

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0defines t=
he=C2=A0 SRv6

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 > SID=
 Structure Sub-Sub-TLV. In particular, it defines

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0encoding =
for the

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 > loc=
ator block length and the locator node length. 

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0The text =
refers to

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 > [I-=
D.ietf-spring-srv6-network-programming] for the

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0definitio=
n of these

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 > con=
cepts.

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

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 > As =
far as I can tell, the only reference to locator

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0block and=
 locator

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 > nod=
e in draft-ietf-spring-srv6-network-programming-10

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0is sectio=
n 3.1

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 > whi=
ch has the following 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 >=C2=
=A0 =C2=A0 =C2=A0A locator may be represented as B:N where B is

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0the SRv6 =
SID block

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 >=C2=
=A0 =C2=A0 =C2=A0(IPv6 subnet allocated for SRv6 SIDs by the

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0operator)=
 and N is the

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 >=C2=
=A0 =C2=A0 =C2=A0identifier of the parent node instantiating the

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0SID...
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =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 t=
hink that we need a much more detailed description

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0of the lo=
cator

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 > blo=
ck and locator node.

> 

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0sure, but=
 that would be in the

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0draft-iet=
f-spring-srv6-network-programming-10, not in

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0draft-iet=
f-lsr-isis-srv6-extensions, as these are not a

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0protocol<=
br>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0specific =
constructs.

> 

>=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=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 =C2=A0 =C2=A0 =C2=A0 > Tha=
nks,

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

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 > Chr=
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 =C2=A0_______________________=
___________________________________________________________________________=
___________________________

> 

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0____

> 

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Ce message et ses piece=
s jointes peuvent contenir des

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0informations confidenti=
elles ou privilegiees et ne doivent donc____

> 

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0pas etre diffuses, expl=
oites ou copies sans autorisation. Si

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0vous avez recu ce messa=
ge par erreur, veuillez le signaler____

> 

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0a l'expediteur et l=
e detruire ainsi que les pieces jointes.

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Les messages electroniq=
ues etant susceptibles d'alteration,____

> 

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Orange decline toute re=
sponsabilite si ce message a ete

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0altere, deforme ou fals=
ifie. Merci.____

> 

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0____

> 

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0This message and its at=
tachments may contain confidential or

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0privileged information =
that may be protected by law;____

> 

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0they should not be dist=
ributed, used or copied without

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0authorisation.____

> 

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0If you have received th=
is email in error, please notify the

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0sender and delete this =
message and its attachments.____

> 

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0As emails may be altere=
d, Orange is not liable for messages

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0that have been modified=
, changed or falsified.____

> 

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Thank you.____

> 

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0_______________________=
___________________________________________________________________________=
___________________________

> 

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0____

> 

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Ce message et ses piece=
s jointes peuvent contenir des

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0informations confidenti=
elles ou privilegiees et ne doivent donc____

> 

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0pas etre diffuses, expl=
oites ou copies sans autorisation. Si

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0vous avez recu ce messa=
ge par erreur, veuillez le signaler____

> 

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0a l'expediteur et l=
e detruire ainsi que les pieces jointes.

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Les messages electroniq=
ues etant susceptibles d'alteration,____

> 

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Orange decline toute re=
sponsabilite si ce message a ete

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0altere, deforme ou fals=
ifie. Merci.____

> 

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0____

> 

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0This message and its at=
tachments may contain confidential or

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0privileged information =
that may be protected by law;____

> 

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0they should not be dist=
ributed, used or copied without

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0authorisation.____

> 

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0If you have received th=
is email in error, please notify the

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0sender and delete this =
message and its attachments.____

> 

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0As emails may be altere=
d, Orange is not liable for messages

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0that have been modified=
, changed or falsified.____

> 

>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Thank you.____

> 






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From: Alvaro Retana 
In-Reply-To: 
References:  <6bd667d8-6957-894e-f11e-aa727065190c@cisco.com>  <0d9b6c73-d309-d2ee-15e0-722df9c32629@cisco.com>     <53F0A553-4075-40A1-A262-47E7EB72E887@cisco.com>  <7f4535c1-3d1d-4c27-77f2-30150b4e9f42@cisco.com>   
MIME-Version: 1.0
Date: Mon, 23 Mar 2020 18:23:10 +0000
Message-ID: 
To: "Acee Lindem (acee)" , "Peter Psenak (ppsenak)" ,  "draft-ietf-isis-mpls-elc@ietf.org" 
Cc: "lsr@ietf.org" , "lsr-chairs@ietf.org" 
Content-Type: multipart/alternative; boundary="00000000000045b60305a189ba07"
Archived-At: 
Subject: Re: [Lsr] AD Review of draft-ietf-isis-mpls-elc-10
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Ok=E2=80=A6let=E2=80=99s move forward.  No need to add more text.

Alvaro.

On March 23, 2020 at 10:36:42 AM, Acee Lindem (acee) (acee@cisco.com) wrote=
:

Hi Alvaro,

=EF=BB=BFOn 3/23/20, 5:17 AM, "Peter Psenak"  wrote:

Hi Alavaro,

On 20/03/2020 19:23, Alvaro Retana wrote:
> On March 20, 2020 at 10:34:59 AM, Peter Psenak wrote:
>
>
> Peter:
>
>
>>>>> I don't really see why one would affect the other.
>>>>
>>>> I agree. BMI-MSD is an egress capability and ERLD-MSD is an ingress
>>>> capability. While they may be related in the internal ASIC
implementation,
>>>> they are independent from a capability perspective.
>>>
>>> Please write that then.
>>
>> there are many MSDs defined already, are we going to write that the new
>> MSD type is not interacting with any other MSD each time we define a new
>> one?
>
> Yes, when they could be related, we are. More importantly, the reason
> why the will not interact, which is what Acee=E2=80=99s text points to.

honestly I do not see a reason to say that they do not interact. Because
if I use your logic I would have to mention hundred other node
capabilities that ERLD-MSD is not interacting with. My logic is that if
something interacts it needs to be specified, if it does not, it does
not need to be.

I agree. It seems like a slippery slope to specifically call out protocol
elements which not related from a protocol standpoint.

Thanks,
Acee

>
> BTW, according to the registry there are only 2 MSDs defined:
>
https://www.iana.org/assignments/igp-parameters/igp-parameters.xhtml#igp-ms=
d-types

there are more defined for SRv6 - draft-ietf-lsr-isis-srv6-extensions-06.

thanks,
Peter


>
>
> Alvaro.
>
>

--00000000000045b60305a189ba07
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

=

Ok=E2=80=A6let=E2=80=99s move forward.=C2=A0 No =
need to add more text.

Alvaro.
 
On March 23, 2020 at 10:36:42=
 AM, Acee Lindem (acee) (acee@cisco.com) wrote:
 
Hi Alvaro, =20



=EF=BB=BFOn 3/23/20, 5:17 AM, "Peter Psenak" <ppsenak@cisco.com> wrote:



    Hi Alavaro,

    =20

    On 20/03/2020 19:23, Alvaro Retana wrote:

    > On March 20, 2020 at 10:34:59 AM, Peter Psenak wrote:

    > =20

    > =20

    > Peter:

    > =20

    > =20

    >>>>> I don't really see why one would affect th=
e other.

    >>>>

    >>>> I agree. BMI-MSD is an egress capability and ERLD-=
MSD is an ingress

    >>>> capability. While they may be related in the inter=
nal ASIC implementation,

    >>>> they are independent from a capability perspective=
.

    >>>

    >>> Please write that then.

    >>

    >> there are many MSDs defined already, are we going to write=
 that the new

    >> MSD type is not interacting with any other MSD each time w=
e define a new

    >> one?

    > =20

    > Yes, when they could be related, we are.  More importantly, th=
e reason

    > why the will not interact, which is what Acee=E2=80=99s text p=
oints to.

    =20

    honestly I do not see a reason to say that they do not interact. Be=
cause =20

    if I use your logic I would have to mention hundred other node =20

    capabilities that ERLD-MSD is not interacting with. My logic is tha=
t if =20

    something interacts it needs to be specified, if it does not, it do=
es =20

    not need to be.



I agree. It seems like a slippery slope to specifically call out protoc=
ol elements which not related from a protocol standpoint. =20



Thanks,

Acee

    =20

    > =20

    > BTW, according to the registry there are only 2 MSDs defined:

    > https://www.iana.org/assignments/igp-param=
eters/igp-parameters.xhtml#igp-msd-types

    =20

    there are more defined for SRv6 - draft-ietf-lsr-isis-srv6-extensio=
ns-06.

    =20

    thanks,

    Peter

    =20

    =20

    > =20

    > =20

    > Alvaro.

    > =20

    > =20

    =20

    =20



 
<=
/body>

--00000000000045b60305a189ba07--


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A new interim meeting request has just been submitted by Christian Hopps.

This request requires approval by the Area Director of the Routing Area

The meeting can be approved here: 
https://datatracker.ietf.org/meeting/interim/request/interim-2020-lsr-02



---------------------------------------------------------
Working Group Name: Link State Routing
Area Name: Routing Area
Session Requester: Christian Hopps

Meeting Type: Virtual Meeting

Session 1:

Date: 2020-04-29
Start Time: 10:00 America/Detroit
Duration: 02:00
Remote Participation Information: Remote participation information will be obtained at the time of approval
Agenda Note: 

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



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The Link State Routing (lsr) Working Group will hold
a virtual interim meeting on 2020-04-29 from 10:00 to 12:00 America/Detroit.

Agenda:
Second LSR Virtual IETF 107 meeting date.

Information about remote participation:
Remote participation information will be obtained at the time of approval


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A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Link State Routing WG of the IETF.

        Title           : Signaling Entropy Label Capability and Entropy Readable Label Depth Using IS-IS
        Authors         : Xiaohu Xu
                          Sriganesh Kini
                          Peter Psenak
                          Clarence Filsfils
                          Stephane Litkowski
                          Matthew Bocci
	Filename        : draft-ietf-isis-mpls-elc-11.txt
	Pages           : 8
	Date            : 2020-03-24

Abstract:
   Multiprotocol Label Switching (MPLS) has defined a mechanism to load-
   balance traffic flows using Entropy Labels (EL).  An ingress Label
   Switching Router (LSR) cannot insert ELs for packets going into a
   given Label Switched Path (LSP) unless an egress LSR has indicated
   via signaling that it has the capability to process ELs, referred to
   as the Entropy Label Capability (ELC), on that tunnel.  In addition,
   it would be useful for ingress LSRs to know each LSR's capability for
   reading the maximum label stack depth and performing EL-based load-
   balancing, referred to as Entropy Readable Label Depth (ERLD).  This
   document defines a mechanism to signal these two capabilities using
   IS-IS.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-isis-mpls-elc/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-isis-mpls-elc-11
https://datatracker.ietf.org/doc/html/draft-ietf-isis-mpls-elc-11

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-isis-mpls-elc-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/



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Hi Alvaro,

I posted a new version - draft-ietf-isis-mpls-elc-11. It should have all 
your inputs incorporated.

Please let me know if you are ok with it. Once it's approved from your 
side, I will update the OSPF draft.

thanks,
Peter


  On 23/03/2020 19:23, Alvaro Retana wrote:
> Ok…let’s move forward.  No need to add more text.
> 
> Alvaro.
> 
> On March 23, 2020 at 10:36:42 AM, Acee Lindem (acee) (acee@cisco.com 
> ) wrote:
> 
>> Hi Alvaro,
>>
>> On 3/23/20, 5:17 AM, "Peter Psenak" > > wrote:
>>
>> Hi Alavaro,
>>
>> On 20/03/2020 19:23, Alvaro Retana wrote:
>> > On March 20, 2020 at 10:34:59 AM, Peter Psenak wrote: 
>> > 
>> > 
>> > Peter: 
>> > 
>> > 
>> >>>>> I don't really see why one would affect the other. 
>> >>>> 
>> >>>> I agree. BMI-MSD is an egress capability and ERLD-MSD is an ingress 
>> >>>> capability. While they may be related in the internal ASIC implementation, 
>> >>>> they are independent from a capability perspective. 
>> >>> 
>> >>> Please write that then. 
>> >> 
>> >> there are many MSDs defined already, are we going to write that the new 
>> >> MSD type is not interacting with any other MSD each time we define a new 
>> >> one? 
>> > 
>> > Yes, when they could be related, we are. More importantly, the reason 
>> > why the will not interact, which is what Acee’s text points to. 
>>
>> honestly I do not see a reason to say that they do not interact. Because
>> if I use your logic I would have to mention hundred other node
>> capabilities that ERLD-MSD is not interacting with. My logic is that if
>> something interacts it needs to be specified, if it does not, it does
>> not need to be.
>>
>> I agree. It seems like a slippery slope to specifically call out 
>> protocol elements which not related from a protocol standpoint.
>>
>> Thanks,
>> Acee
>>
>> > 
>> > BTW, according to the registry there are only 2 MSDs defined: 
>> > https://www.iana.org/assignments/igp-parameters/igp-parameters.xhtml#igp-msd-types 
>>
>>
>> there are more defined for SRv6 - draft-ietf-lsr-isis-srv6-extensions-06.
>>
>> thanks,
>> Peter
>>
>>
>> > 
>> > 
>> > Alvaro. 
>> > 
>> > 
>>
>>
>>


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On March 24, 2020 at 6:44:50 AM, Peter Psenak wrote:


> I posted a new version - draft-ietf-isis-mpls-elc-11. It should have all
> your inputs incorporated.
>
> Please let me know if you are ok with it. Once it's approved from your
> side, I will update the OSPF draft.

Yes, it looks good to me. =C2=A0I just have a couple of minor nits (below)
-- no need to address them right now, you can wait for other Last Call
comments.

Thanks!

Alvaro.




86	 =C2=A0 Recently, mechanisms have been defined to signal labels via link=
-
87	 =C2=A0 state Interior Gateway Protocols (IGP) such as IS-IS [RFC8660]. =
=C2=A0This

[minor] Wouldn't a better reference for this be rfc8667?


90	 =C2=A0 In cases where LSPs are used for whatever reasons (e.g., SR-MPLS

[nit] s/LSPs are used for whatever reasons/LSPs are used


149	 =C2=A0 assigned by IANA for EARLD-MSD. =C2=A0MSD-Value field is set to=
 the ERLD

[nit] s/MSD-Value field/The MSD-Value field


199	 =C2=A0 considerations as described in [RFC4971], [RFC7752], [RFC7794],
200	 =C2=A0 [RFC8491], [RFC7752], [RFC8662],

[nit] rfc7752 is listed twice


265	 =C2=A0 [RFC4971] =C2=A0Vasseur, JP., Ed., Shen, N., Ed., and R. Aggarw=
al, Ed.,

[minor] Please take this out, and replace the references in the text
to point to rfc7981.


From nobody Tue Mar 24 10:16:56 2020
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To: Alvaro Retana , "Acee Lindem (acee)" , "draft-ietf-isis-mpls-elc@ietf.org" 
Cc: "lsr@ietf.org" , "lsr-chairs@ietf.org" 
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From: Peter Psenak 
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Date: Tue, 24 Mar 2020 18:16:49 +0100
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Subject: Re: [Lsr] AD Review of draft-ietf-isis-mpls-elc-10
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Hi Alvaro,

On 24/03/2020 17:00, Alvaro Retana wrote:
> On March 24, 2020 at 6:44:50 AM, Peter Psenak wrote:
> 
> 
>> I posted a new version - draft-ietf-isis-mpls-elc-11. It should have all
>> your inputs incorporated.
>>
>> Please let me know if you are ok with it. Once it's approved from your
>> side, I will update the OSPF draft.
> 
> Yes, it looks good to me.  

thanks for your patience.



> I just have a couple of minor nits (below)
> -- no need to address them right now, you can wait for other Last Call
> comments.
> 
> Thanks!
> 
> Alvaro.
> 
> 
> 
> 
> 86	   Recently, mechanisms have been defined to signal labels via link-
> 87	   state Interior Gateway Protocols (IGP) such as IS-IS [RFC8660].  This
> 
> [minor] Wouldn't a better reference for this be rfc8667?

done.

> 
> 
> 90	   In cases where LSPs are used for whatever reasons (e.g., SR-MPLS
> 
> [nit] s/LSPs are used for whatever reasons/LSPs are used

done

> 
> 
> 149	   assigned by IANA for EARLD-MSD.  MSD-Value field is set to the ERLD
> 
> [nit] s/MSD-Value field/The MSD-Value field

done.

> 
> 
> 199	   considerations as described in [RFC4971], [RFC7752], [RFC7794],
> 200	   [RFC8491], [RFC7752], [RFC8662],
> 
> [nit] rfc7752 is listed twice

done.

> 
> 
> 265	   [RFC4971]  Vasseur, JP., Ed., Shen, N., Ed., and R. Aggarwal, Ed.,
> 
> [minor] Please take this out, and replace the references in the text
> to point to rfc7981.

done.

thanks,
Peter
> 
> 


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To: "lsr-chairs@ietf.org" 
CC: "lsr@ietf.org" , Yingzhen Qu , "Vigoureux, Martin (Nokia - FR/Paris-Saclay)" 
Thread-Topic: [Lsr] Agenda Posted Re: Link State Routing (lsr) WG Virtual Meeting: 2020-04-02
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In-Reply-To: 
From: Tony Przygienda 
Date: Tue, 24 Mar 2020 17:56:22 -0700
Message-ID: 
To: Alvaro Retana 
Cc: "lsr-chairs@ietf.org" , "lsr@ietf.org" , "Vigoureux, Martin (Nokia - FR/Paris-Saclay)" , Yingzhen Qu ,  Chris Bowers 
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Subject: Re: [Lsr] Agenda Posted Re: Link State Routing (lsr) WG Virtual Meeting: 2020-04-02
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--000000000000e5850a05a1a35cd7
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any chance people can post invite.ics I cn import into my agenda? it's
really tedious with the timezones & every group announcing the time in
different way ;-)

Having said that, if we present this topic we could plug in
draft-przygienda-lsr-flood-reflection
update preso in case Chris wants to do it (for me it's 6am in the morning
so I pass). We had an update with readability comments and also some
procedure/format clarifications. Yes, I  think on the list there were
voices supporting work in this area & backing this draft. From our side we
see that it 1. works & 2. seems to solve a problem for several customers
within the parameters they set.

--- tony

On Tue, Mar 24, 2020 at 3:15 PM Alvaro Retana 
wrote:

> On March 24, 2020 at 1:42:29 PM, Yingzhen Qu wrote:
>
>
> [Speaking as a WG participant.]
>
>
> > Now we have two interim sessions scheduled, please find updated agenda
> here:
> >
> https://datatracker.ietf.org/meeting/interim-2020-lsr-01/materials/agenda-interim-2020-lsr-01-lsr-01.html
>
> >
> > If there is any question, please let us know.
>
>
> Dear Chairs:
>
> Hi!
>
>
> I have a question, perhaps an early agenda bash.
>
> The agenda includes presentations of the Area Proxy/TTZ drafts [*].
>
> Acee had sent a message to the WG "asking whether there is a really a
> strong requirement to advance one or more of these documents" [1]. I saw a
> couple of replies on the list supporting this type of work, but I didn't
> see a discussion related to what specific requirements/issues/"places in
> the network" should be addressed.
>
> What was the conclusion of the thread?  Are we ready to start/continue
> discussing the drafts?
>
>
> Thanks!
>
> Alvaro.
>
>
> [*] Disclaimer: I am an author on the TTZ draft -- cc'ing Martin just in
> case an AD is needed at this early stage.
>
> [1] https://mailarchive.ietf.org/arch/msg/lsr/Dc1YZd6KgKrwx3ooqLcdW3C6qPY/
>
>
> _______________________________________________
> Lsr mailing list
> Lsr@ietf.org
> https://www.ietf.org/mailman/listinfo/lsr
>

--000000000000e5850a05a1a35cd7
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable


any chance people can post invite.ics I cn import int=
o my agenda? it's really tedious with the timezones & every group a=
nnouncing the time in different way ;-)

Having sai=
d that, if we present this topic we could plug in draft-prz=
ygienda-lsr-flood-reflection update preso in case Chris wants to do it (for=
 me it's 6am in the morning so I pass). We had an update with readabili=
ty comments and also some procedure/format clarifications. Yes, I=C2=A0 thi=
nk on the list there were voices supporting work in this area & backing=
 this draft. From our side we see that it 1. works & 2. seems to solve =
a problem for several customers within the parameters they set. 
=


--- tony 

On Tue, Mar 24, 2=
020 at 3:15 PM Alvaro Retana <alvaro.retana@futurewei.com> wrote:
On March 24, 2020 at 1:42:29 PM, Yingzhen =
Qu wrote:





[Speaking as a WG participant.]=C2=A0 





> Now we have two interim sessions scheduled, please find updated agenda=
 here:=C2=A0 

> https://datatracker.ietf.org/meeting/interim-2020-lsr-01/materi=
als/agenda-interim-2020-lsr-01-lsr-01.html =C2=A0

>=C2=A0 

> If there is any question, please let us know.=C2=A0 





Dear Chairs:=C2=A0 



Hi!=C2=A0 





I have a question, perhaps an early agenda bash.=C2=A0 



The agenda includes presentations of the Area Proxy/TTZ drafts [*].=C2=A0 <=
br>


Acee had sent a message to the WG "asking whether there is a really a =
strong requirement to advance one or more of these documents" [1]. I s=
aw a couple of replies on the list supporting this type of work, but I didn=
't see a discussion related to what specific requirements/issues/"=
places in the network" should be addressed.=C2=A0 



What was the conclusion of the thread?=C2=A0 Are we ready to start/continue=
 discussing the drafts?=C2=A0 





Thanks!=C2=A0 



Alvaro.=C2=A0 





[*] Disclaimer: I am an author on the TTZ draft -- cc'ing Martin just i=
n case an AD is needed at this early stage.=C2=A0 



[1] https://mailarchive.ietf.o=
rg/arch/msg/lsr/Dc1YZd6KgKrwx3ooqLcdW3C6qPY/ =C2=A0



_______________________________________________

Lsr mailing list

Lsr@ietf.org

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




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From: Yingzhen Qu 
Date: Tue, 24 Mar 2020 20:44:15 -0700
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To: lsr@ietf.org, lsr-chairs@ietf.org
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Subject: [Lsr] LSR Interim Invitations (.ics attached)
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--00000000000062594f05a1a5afab
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Hi all,

Attached are the invite.ics files for LSR Interim sessions with Webex info.
Please let me know if there is any questions.

Thanks,
Yingzhen

--00000000000062594f05a1a5afab
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Hi all,

Attached are the invite.ics files for LSR Interim sessions with Webex info. Please let me know if there is any questions.

Thanks,
Yingzhen


--00000000000062594f05a1a5afab--

--00000000000062595005a1a5afad
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Subject: [Lsr] Using IS-IS Multi-Topology (MT) for Segment Routing based Virtual Transport Network
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=0A

Hello, folks=
,

we have submitted a new draft of  https://=
tools.ietf.org/html/draft-xie-lsr-isis-sr-vtn-mt-00 .

=

It is about Using IS-IS Multi-Topology (MT) for Segment Routing based=
 Virtual Transport Network. Enhanced VPN (VPN+) as defined in I-D.ietf-tea=
s-enhanced-vpn aims to provide enhanced VPN service to support some applic=
ations's needs of enhanced isolation and stringent performance requirement=
s.  VPN+ requries integration between the overlay VPN and the underla=
y network.  A Virtual Transport Network (VTN) is a virtual network wh=
ich consists of a subset of the network toplogy and network resources allo=
cated from the underlay network.  A VTN could be used as the underlay=
 for one or a group of VPN+ services. This document describes a simplified=
 mechanism to build the SR based VTNs using IGP multi- topology together w=
ith other well-defined IS-IS extensions.

Comments=
 and suggestions are highly appreciated.

Chongfen=
g Xie
=



=

=0A
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To: "xiechf@chinatelecom.cn" , lsr 
References: <2020032521444882209619@chinatelecom.cn>
From: "Joel M. Halpern" 
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Date: Wed, 25 Mar 2020 09:52:51 -0400
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Subject: Re: [Lsr] Using IS-IS Multi-Topology (MT) for Segment Routing based Virtual Transport Network
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This drafts starts by asserting that there are limitations on what can 
be done with the existing technology.  As the description is quite 
vague, I can not be certain.  But I do not know of any difficulty in 
providing the described capabilities with current technology, without 
introducing a new, undescribed, construct called a VTN.

Yours,
Joel

On 3/25/2020 9:44 AM, xiechf@chinatelecom.cn wrote:
> 
> Hello, folks,
> 
> we have submitted a new draft of 
>  https://tools.ietf.org/html/draft-xie-lsr-isis-sr-vtn-mt-00 .
> 
> It is about Using IS-IS Multi-Topology (MT) for Segment Routing based 
> Virtual Transport Network. Enhanced VPN (VPN+) as defined in 
> I-D.ietf-teas-enhanced-vpn aims to provide enhanced VPN service to 
> support some applications's needs of enhanced isolation and stringent 
> performance requirements. VPN+ requries integration between the overlay 
> VPN and the underlay network. A Virtual Transport Network (VTN) is a 
> virtual network which consists of a subset of the network toplogy and 
> network resources allocated from the underlay network. A VTN could be 
> used as the underlay for one or a group of VPN+ services. This document 
> describes a simplified mechanism to build the SR based VTNs using IGP 
> multi- topology together with other well-defined IS-IS extensions.
> 
> Comments and suggestions are highly appreciated.
> 
> Chongfeng Xie
> 
> 
> 
> _______________________________________________
> Lsr mailing list
> Lsr@ietf.org
> https://www.ietf.org/mailman/listinfo/lsr
> 


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To: "xiechf@chinatelecom.cn" , lsr 
References: <2020032521444882209619@chinatelecom.cn>
From: Peter Psenak 
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Subject: Re: [Lsr] Using IS-IS Multi-Topology (MT) for Segment Routing based Virtual Transport Network
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Hi Chongfeng,

what exactly is being standardized in this draft? I don't see anything.

thanks,
Peter


On 25/03/2020 14:44, xiechf@chinatelecom.cn wrote:
> 
> Hello, folks,
> 
> we have submitted a new draft of 
>   https://tools.ietf.org/html/draft-xie-lsr-isis-sr-vtn-mt-00 .
> 
> It is about Using IS-IS Multi-Topology (MT) for Segment Routing based 
> Virtual Transport Network. Enhanced VPN (VPN+) as defined in 
> I-D.ietf-teas-enhanced-vpn aims to provide enhanced VPN service to 
> support some applications's needs of enhanced isolation and stringent 
> performance requirements.  VPN+ requries integration between the overlay 
> VPN and the underlay network.  A Virtual Transport Network (VTN) is a 
> virtual network which consists of a subset of the network toplogy and 
> network resources allocated from the underlay network.  A VTN could be 
> used as the underlay for one or a group of VPN+ services. This document 
> describes a simplified mechanism to build the SR based VTNs using IGP 
> multi- topology together with other well-defined IS-IS extensions.
> 
> Comments and suggestions are highly appreciated.
> 
> Chongfeng Xie
> 
> 


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To: Chris Bowers 
Cc: "Ketan Talaulikar (ketant)" , "lsr@ietf.org" , SPRING WG List , Bruno Decraene 
References:   <12659_1582880639_5E58D77F_12659_66_1_53C29892C857584299CBF5D05346208A48DCA80D@OPEXCAUBM43.corporate.adroot.infra.ftgroup>  <7453_1582899837_5E59227C_7453_80_1_53C29892C857584299CBF5D05346208A48DD14BA@OPEXCAUBM43.corporate.adroot.infra.ftgroup>      <4bf64ede-c20b-2269-af11-1dffc5328935@cisco.com> 
From: Peter Psenak 
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Date: Wed, 25 Mar 2020 15:48:58 +0100
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Subject: Re: [Lsr] clarification of locator block and locator node in draft-ietf-spring-srv6-network-programming and draft-ietf-lsr-isis-srv6-extensions
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Chris,

please see inline:


On 23/03/2020 17:39, Chris Bowers wrote:
> Peter,
> 
> The proposed SRv6 SID Structure Sub-Sub-TLV has several problems.
> 
> 1) As discussed in item#3 below, it is not clear that flooding LB 
> Length, LN Length, Fun. Length, and Arg. Length to all ISIS speakers is 
> really the right approach.  However, if the WG determines that it is the 
> right approach, the current encodings of this information in the 
> proposed SRv6 SID Structure Sub-Sub-TLV are problematic.  As discussed 
> earlier in this thread, a network operator may choose to not allocate 
> all locators from a single block, so LB Length and LN Length may not be 
> well-defined.  

I'm not sure what do you mean by not "well defined". For every SID you 
need to know the LOC (B+N) part. If you guarantee that it is the same on 
all nodes, you know it from the local config, otherwise, you advertise 
it with a SID.

> The current encoding of the SRv6 SID Structure 
> Sub-Sub-TLV makes it difficult to represent this situation.  The simple 
> thing to do for nodes that don't have a well-defined value of LB Length 
> and LN Length would be to not advertise a value for LB Length and LN 
> Length.  However, since the currently proposed SRv6 SID Structure 
> Sub-Sub-TLV combines LB Length, LN Length, Fun. Length, and Arg. Length 
> into a single sub-sub-TLV, if a node wants to advertise values for Fun. 
> Length and Arg. Length, it also has to advertise values for LB Length 
> and LN Length.  It seems like a better approach would be to have 
> different sub-sub-TLVs, one for  LB Length and LN Length, and a separate 
> one for Fun. Length and Arg. Length to be able to better represent this 
> situation.


I'm afraid you are missing an important point.

SRv6 SID is defined as LOC:FUNCT:ARG, where LOC is represented as B:N. 
To be able to find out where the func and arg are located, you need to 
know the LOC length, e.g. Block and Node length. Advertising just Func 
and Arg length does not help.


> 
> 2) Now consider the situation where a network operator chooses to 
> allocate all locators from a single block, so that LB Length and LN 
> Length are well-defined across the network.  A given node should 
> presumably advertise its own understanding of LB Length and LN Length.   
> A given node's understanding of LB Length and LN Length is a property of 
> the node.  It is not a property of a given End SID.  The currently 
> proposed SRv6 SID Structure Sub-Sub-TLV however is carried within each 
> End SID Sub-TLV.  With the currently proposed encoding, presumably an 
> implementation is expected to send the exact same values of LB Length 
> and LN Length for all of the End SIDs that it advertises.  Not only is 
> this inefficient, but it creates the need for logic to decide what to do 
> when different End SIDs advertised by the same node carry different 
> values of LB Length and LN Length in their sub-sub-TLVs.  It seems like 
> a better approach would be for a given node to advertise its 
> understanding of the value of LB Length and LN Length in a sub-TLV of 
> the Router Capability TLV.

When we design the encoding, we have to define it such, that it supports 
all possible use cases. We can not design the encoding that works for 
single use case (allocate all locators from a single block) and does not 
work for others - different block from different node, multiple blocks 
on a single node (e.g. border node), which are all valid.

> 
> 3) At this point, the only use case that has been proposed for flooding 
> the LB Length, LN Length, Fun. Length, and Arg. Length to all ISIS 
> speakers is to make it more convenient for BGP-LS to get those values to 
> an external controller as part of a topology feed from any ISIS node.  
> No use case has been proposed for ISIS speakers themselves to make use 
> of the information.  It seems like a more scalable approach would be to 
> use BGP-LS sessions to collect the information from the subset of nodes 
> that actually produce the relevant information.  So far there are no End 
> SIDs defined that are advertised in ISIS that have a non-zero Arg. 
> Length.  If an End SID with non-zero Arg. Length were to be proposed in 
> the future as needing to be flooded to all ISIS nodes, it seems likely 
> that the new End SID would also be advertised using the BGP IP/VPN/EVPN 
> control plane.   So it seems like a viable alternative for this 
> hypothetical future End SID would be to have the subset of nodes that 
> have non-zero Arg. Length values communicate to an external controller 
> via  BGP sessions. I think the WG needs a more detailed discussion of a 
> concrete use case in order to determine whether flooding LB Length, LN 
> Length, Fun. Length, and Arg. Length to all ISIS speakers is really the 
> right approach.

there are networks, where BGP is not deployed on all nodes, only on a 
few nodes that re-distribute the information to BGP-LS. In such case we 
need the IGP to distribute this data.

Argument that "it seems likely that the new End SID would also be 
advertised using the BGP IP/VPN/EVPN" is a wishful thinking that we can 
not based our encoding on.


> 
> Given the lack of a compelling use case for flooding LB Length, LN 
> Length, Fun. Length, and Arg. Length to all ISIS speakers and the 
> problems with the currently proposed encodings for doing that, I think 
> that the SRv6 SID Structure Sub-Sub-TLV should be removed from 
> draft-ietf-lsr-isis-srv6-extensions. A mechanism for flooding LB Length, 
> LN Length, Fun. Length, and Arg. Length to all ISIS speakers can be 
> defined in a future document.

The security use case has already been pointed out earlier in this thread:

https://tools.ietf.org/html/draft-ietf-6man-segment-routing-header-26#section-5

Given the arguments I mentioned above, I respectfully disagree with the 
removal of the SID Structure Sub-Sub-TLV from the ISIS SRv6 draft.

thanks,
Peter


> 
> Thanks,
> Chris
> 
> On Fri, Mar 13, 2020 at 5:02 AM Peter Psenak  > wrote:
> 
>     Hi Chris,
> 
>     On 12/03/2020 15:58, Chris Bowers wrote:
>      > Peter,
>      >
>      > I think that the SRv6 SID Structure Sub-Sub-TLV should be removed
>     from
>      > draft-ietf-lsr-isis-srv6-extensions.  I think that we should
>     leave the
>      > ability to include sub-sub-TLVs in the SRv6 End SID Sub-TLV,
>     End.X SID
>      > Sub-TLV, and LAN End.X SID Sub-TLV in the encodings for those
>     sub-TLVs.
>      >
>      > I don't think that the current text describing the SRv6 SID
>     Structure
>      > Sub-Sub-TLV would result in interoperable implementations.  Based
>     on the
> 
>     SRv6 base spec defines SID B, L, A, F.
> 
>     SRv6 protocol specs are advertising these values with the SRv6 SID,
>     they
>     don't use them. The usage is outside of the scope of the protocol
>     drafts. What exactly is the problem?
> 
>     thanks,
>     Peter
> 
> 
>      > discussion with Ketan below, it appears that use cases for ISIS
>     speakers
>      > receiving advertised values of LB Length, LN Length, Fun. Length,
>     and
>      > Arg. Length are not currently well-defined.    So I think it
>     makes sense
>      > to defer the definition of the SRv6 SID Structure Sub-Sub-TLV to a
>      > future document.
>      >
>      > Thanks,
>      > Chris
>      >
>      > On Thu, Mar 12, 2020 at 6:02 AM Ketan Talaulikar (ketant)
>      > 
>     >> wrote:
>      >
>      >     Hi Chris,____
>      >
>      >     __ __
>      >
>      >     Dropping the draft-ietf-spring-srv6-network-programming authors
>      >     since we are now back to discussing the ISIS extensions.____
>      >
>      >     __ __
>      >
>      >     Please check inline below.____
>      >
>      >     __ __
>      >
>      >     *From:*Chris Bowers      
>      >          >>
>      >     *Sent:* 05 March 2020 21:53
>      >     *To:* Ketan Talaulikar (ketant)      
>      >     >>
>      >     *Cc:* Ketan Talaulikar (ketant)      
>      >     >>;
>     lsr@ietf.org       >;
>      >     SPRING WG List 
>     >>;
>      >     draft-ietf-spring-srv6-network-programming
>      >          
>      >          >>; Peter
>      >     Psenak (ppsenak)            >>;
>      >     Bruno Decraene      
>      >          >>
>      >     *Subject:* Re: [Lsr] clarification of locator block and
>     locator node
>      >     in draft-ietf-spring-srv6-network-programming and
>      >     draft-ietf-lsr-isis-srv6-extensions____
>      >
>      >     __ __
>      >
>      >     Ketan,____
>      >
>      >     __ __
>      >
>      >     See inline [CB].____
>      >
>      >     __ __
>      >
>      >     On Wed, Mar 4, 2020 at 12:36 AM Ketan Talaulikar (ketant)
>      >     
>     >> wrote:____
>      >
>      >         Hi Chris,____
>      >
>      >         ____
>      >
>      >         You are right in that there is no assumption that all SRv6
>      >         locators in a domain are allocated from the same block.
>      >         Therefore knowing the blocks used in the domain is
>     useful.____
>      >
>      >     ____
>      >
>      >     [CB] Since you refer to "blocks" (plural) in this sentence,
>     are you
>      >     saying that in the scenario where all SRv6 locators in a
>     domain are
>      >     not allocated from the same block, you would expect different
>      >     routers in the same domain to advertise different values of B
>     and N?
>      >     ____
>      >
>      >     */[KT] While personally I believe it would not be the usual
>     case, it
>      >     is left to the operator.____/*
>      >
>      >     */__ __/*
>      >
>      >     For example, assume we have a network where all SRv6 locators
>     in a
>      >     domain are not allocated from the same block.  Router A
>     advertises
>      >     an SRv6 Locator TLV with locator = 2000::/64, and an SRv6 End SID
>      >     sub-TLV with some endpoint behavior. Router B advertises an SRv6
>      >     Locator TLV with locator = 3000::/64, and an SRv6 End SID sub-TLV
>      >     with some endpoint behavior. What should routers A and B
>     advertise
>      >     as the values of B and N in their SRv6 SID Structure
>     Sub-Sub-TLVs ?____
>      >
>      >     */[KT] It is difficult for me to figure out what the block
>     and node
>      >     parts are with such an addressing./*____
>      >
>      >     ____
>      >
>      >         ____
>      >
>      >         The IGP drafts covers the advertisement of the B and N
>     parts of
>      >         the locally configured locator on the node via IGPs. On the
>      >         receiver side, the IGP may not really do much with this
>      >         information, however it enables propagation of this
>     information
>      >         from all nodes in the network to be advertised out via BGP-LS
>      >         (or other mechanisms) as part of the topology feed. Once
>     this is
>      >         part of the topology feed, it enables use-cases on
>     controllers
>      >         to perform network wide validation of the SRv6 SID block
>      >         provisioning and can also help in automation of the security
>      >         aspects described in
>      >
>     https://tools.ietf.org/html/draft-ietf-6man-segment-routing-header-26#section-5____
>      >
>      >         ____
>      >
>      >     [CB] If an ISIS speaker is not expected to do anything with B
>     and N,
>      >     then I think the text in draft-ietf-lsr-isis-srv6-extensions
>     needs
>      >     to clarify this.  I have a similar observation about Fun.
>     Length and
>      >     Arg. Length in the SRv6 SID Structure Sub-Sub-TLV .  As far
>     as I can
>      >     tell, none of the endpoint behaviors that are currently
>     specified to
>      >     be carried in ISIS End, End.X, and LAN End.X SIDs sub-TLVs
>     uses an
>      >     Argument, so there is never a case where an SRv6 SID Structure
>      >     Sub-Sub-TLV should have a non-zero value for Arg. Length. What
>      >     should an ISIS speaker do if it receives a non-zero value of the
>      >     Arg. Length for an endpoint behavior that doesn't use an
>     argument?
>      >     Are there any use cases envisioned where an ISIS speaker needs to
>      >     know the Arg. Length ? ____
>      >
>      >     */[KT] The behaviors currently listed in the draft do not have an
>      >     argument nor is the use of B and N required for them. We cannot
>      >     preclude a future use-case or extension where such behaviors
>      >     introduced are also applicable to ISIS. So IMHO ruling such
>     aspects
>      >     out might not be the right thing to do from a protocol
>     extensibility
>      >     perspective.____/*
>      >
>      >     */__ __/*
>      >
>      >     */Thanks,____/*
>      >
>      >     */Ketan/*____
>      >
>      >     __ __
>      >
>      >         Thanks,____
>      >
>      >         Ketan____
>      >
>      >         ____
>      >
>      >         *From:*Chris Bowers      
>      >              >>
>      >         *Sent:* 02 March 2020 23:39
>      >         *To:* Ketan Talaulikar (ketant)      
>      >         >>
>      >         *Cc:* Ketan Talaulikar (ketant)
>      >              
>      >              >>; lsr@ietf.org
>     
>      >         >; SPRING WG
>     List 
>      >         >>;
>      >         draft-ietf-spring-srv6-network-programming
>      >              
>      >       
>            >>;
>      >         Peter Psenak (ppsenak)      
>      >         >>;
>     Bruno Decraene
>      >                    >>
>      >         *Subject:* Re: [Lsr] clarification of locator block and
>     locator
>      >         node in draft-ietf-spring-srv6-network-programming and
>      >         draft-ietf-lsr-isis-srv6-extensions____
>      >
>      >         ____
>      >
>      >         Ketan,____
>      >
>      >         ____
>      >
>      >         Based on current documents, allocating all SRv6 locators
>     used in
>      >         a domain from a single block is optional.____
>      >
>      >         ____
>      >
>      >         However, assuming for the moment that a network operator has
>      >         chosen to allocate all SRv6 locators used in a domain from a
>      >         single block, so that there is a well-defined value of B
>     and N
>      >         across a domain, what is the use of having a router advertise
>      >         its own understanding of these two values?  And what is a
>      >         receiver supposed to do with this information?____
>      >
>      >         ____
>      >
>      >         Thanks,____
>      >
>      >         Chris____
>      >
>      >         ____
>      >
>      >         On Fri, Feb 28, 2020 at 8:23 AM
>     
>      >              >> wrote:____
>      >
>      >             Hi Ketan,____
>      >
>      >             ____
>      >
>      >             Thanks fort the follow up.____
>      >
>      >             Clarification inline [Bruno]____
>      >
>      >             ____
>      >
>      >             *From**:*Ketan Talaulikar (ketant)
>     [mailto:ketant@cisco.com 
>      >             >]
>      >             *Sent:* Friday, February 28, 2020 11:11 AM
>      >             *To:* DECRAENE Bruno TGI/OLN; Ketan Talaulikar (ketant);
>      >             Chris Bowers
>      >             *Cc:* lsr@ietf.org 
>     >; SPRING WG List;
>      >             draft-ietf-spring-srv6-network-programming; Peter Psenak
>      >             (ppsenak)
>      >             *Subject:* RE: [Lsr] clarification of locator block and
>      >             locator node in
>     draft-ietf-spring-srv6-network-programming
>      >             and draft-ietf-lsr-isis-srv6-extensions____
>      >
>      >             ____
>      >
>      >             Hi Bruno,____
>      >
>      >             ____
>      >
>      >             I believe the description and usage of Locator is
>     very well
>      >             described and covered in the net-pgm draft as also the
>      >             corresponding IGP extensions. Is the question is more
>     about
>      >             the “block” part of it (what is not in the block part
>     is in
>      >             the node part as per the text in the net-pgm draft)?____
>      >
>      >             ____
>      >
>      >             The “block” is again not a new thing. Please check the
>      >             following:____
>      >
>      >             Under
>      >
>     https://tools.ietf.org/html/draft-ietf-6man-segment-routing-header-26#section-5
>      >             … look for “block”____
>      >
>      > https://tools.ietf.org/html/rfc8402#section-2 … look under
>      >             SRGB for SRv6____
>      >
>      >             ____
>      >
>      >             [Bruno]____
>      >
>      >             To clarify, my question was not specific to “block” but
>      >             related to the usage, by the receiver, of the following
>      >             piece of information:____
>      >
>      >             ____
>      >
>      >                    LB Length: SRv6 SID Locator Block length____
>      >
>      >                    LN Length: SRv6 SID Locator Node length____
>      >
>      >                    Fun. Length: SRv6 SID Function length____
>      >
>      >                    Arg. Length: SRv6 SID Arguments length____
>      >
>      >             ____
>      >
>      >             ____
>      >
>      >             So perhaps I don’t get Chris’s point and would wait
>     for him
>      >             to clarify.____
>      >
>      >             [Bruno] I’ll leave this to Chris.____
>      >
>      >             ____
>      >
>      >             Thanks,____
>      >
>      >             Ketan____
>      >
>      >             ____
>      >
>      >             *From:*Lsr      
>      >                  >> *On Behalf Of
>      >             *bruno.decraene@orange.com
>           >
>      >             *Sent:* 28 February 2020 14:34
>      >             *To:* Ketan Talaulikar (ketant)
>      >                  
>      >                  >>; Chris Bowers
>      >                  
>     >>
>      >             *Cc:* lsr@ietf.org 
>     >; SPRING WG List
>      >             
>     >>;
>      >             draft-ietf-spring-srv6-network-programming
>      >                  
>      >           
>            >>;
>      >             Peter Psenak (ppsenak)      
>      >             >>
>      >             *Subject:* Re: [Lsr] clarification of locator block and
>      >             locator node in
>     draft-ietf-spring-srv6-network-programming
>      >             and draft-ietf-lsr-isis-srv6-extensions____
>      >
>      >             ____
>      >
>      >             Hi Ketan,____
>      >
>      >             ____
>      >
>      >             ____
>      >
>      >             ____
>      >
>      >             *From:*Lsr [mailto:lsr-bounces@ietf.org
>     ] *On Behalf Of
>      >             *Ketan Talaulikar (ketant)
>      >             *Sent:* Friday, February 28, 2020 6:30 AM____
>      >
>      >             ____
>      >
>      >             Hi Chris,____
>      >
>      >             ____
>      >
>      >             I agree with Peter and I would suggest to drop LSR since
>      >             this is not a protocol specific thing.____
>      >
>      >             ____
>      >
>      >             I believe the text in
>      >             draft-ietf-spring-srv6-network-programming clears
>     says what
>      >             locator block and locator node are. What more details
>     do you
>      >             think are required?____
>      >
>      >             ____
>      >
>      >             [Bruno] Speaking as an individual, the draft could
>     possibly
>      >             clarify the usage of these information/fields by the
>      >             receiver. Possibly using the same name/term (e.g.
>     SRv6 SID
>      >             Locator Block length) to ease the references between both
>      >             drafts.____
>      >
>      >             ____
>      >
>      >             Thanks,____
>      >
>      >             --Bruno____
>      >
>      >             ____
>      >
>      >             Thanks,____
>      >
>      >             Ketan____
>      >
>      >             ____
>      >
>      >             *From:*Lsr      
>      >                  >> *On Behalf Of *Chris Bowers
>      >             *Sent:* 27 February 2020 22:46
>      >             *To:* lsr@ietf.org 
>     >; SPRING WG List
>      >             
>     >>
>      >             *Cc:* Peter Psenak (ppsenak)      
>      >             >>
>      >             *Subject:* [Lsr] clarification of locator block and
>     locator
>      >             node in draft-ietf-spring-srv6-network-programming and
>      >             draft-ietf-lsr-isis-srv6-extensions____
>      >
>      >             ____
>      >
>      >             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
>      >                  > ____
>      >
>      >           
>       _____________________________________________________________________________________________________________________________
>      >
>      >             ____
>      >
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>      >             informations confidentielles ou privilegiees et ne
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>     autorisation. Si
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>     signaler____
>      >
>      >             a l'expediteur et le detruire ainsi que les pieces
>     jointes.
>      >             Les messages electroniques etant susceptibles
>     d'alteration,____
>      >
>      >             Orange decline toute responsabilite si ce message a ete
>      >             altere, deforme ou falsifie. Merci.____
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>      >             authorisation.____
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> 


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In-Reply-To: 
From: Yingzhen Qu 
Date: Wed, 25 Mar 2020 12:25:43 -0700
Message-ID: 
To: Tony Przygienda 
Cc: Alvaro Retana ,  "lsr-chairs@ietf.org" , "lsr@ietf.org" ,  "Vigoureux, Martin (Nokia - FR/Paris-Saclay)" , Yingzhen Qu ,  Chris Bowers 
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Subject: Re: [Lsr] Agenda Posted Re: Link State Routing (lsr) WG Virtual Meeting: 2020-04-02
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Hi Tony,

The agenda has been updated with your presentation:
https://datatracker.ietf.org/meeting/interim-2020-lsr-01/materials/agenda-interim-2020-lsr-01-lsr-01.html


Thanks,
Yingzhen

On Tue, Mar 24, 2020 at 5:58 PM Tony Przygienda  wrote:

> any chance people can post invite.ics I cn import into my agenda? it's
> really tedious with the timezones & every group announcing the time in
> different way ;-)
>
> Having said that, if we present this topic we could plug in draft-przygienda-lsr-flood-reflection
> update preso in case Chris wants to do it (for me it's 6am in the morning
> so I pass). We had an update with readability comments and also some
> procedure/format clarifications. Yes, I  think on the list there were
> voices supporting work in this area & backing this draft. From our side we
> see that it 1. works & 2. seems to solve a problem for several customers
> within the parameters they set.
>
> --- tony
>
> On Tue, Mar 24, 2020 at 3:15 PM Alvaro Retana 
> wrote:
>
>> On March 24, 2020 at 1:42:29 PM, Yingzhen Qu wrote:
>>
>>
>> [Speaking as a WG participant.]
>>
>>
>> > Now we have two interim sessions scheduled, please find updated agenda
>> here:
>> >
>> https://datatracker.ietf.org/meeting/interim-2020-lsr-01/materials/agenda-interim-2020-lsr-01-lsr-01.html
>>
>> >
>> > If there is any question, please let us know.
>>
>>
>> Dear Chairs:
>>
>> Hi!
>>
>>
>> I have a question, perhaps an early agenda bash.
>>
>> The agenda includes presentations of the Area Proxy/TTZ drafts [*].
>>
>> Acee had sent a message to the WG "asking whether there is a really a
>> strong requirement to advance one or more of these documents" [1]. I saw a
>> couple of replies on the list supporting this type of work, but I didn't
>> see a discussion related to what specific requirements/issues/"places in
>> the network" should be addressed.
>>
>> What was the conclusion of the thread?  Are we ready to start/continue
>> discussing the drafts?
>>
>>
>> Thanks!
>>
>> Alvaro.
>>
>>
>> [*] Disclaimer: I am an author on the TTZ draft -- cc'ing Martin just in
>> case an AD is needed at this early stage.
>>
>> [1]
>> https://mailarchive.ietf.org/arch/msg/lsr/Dc1YZd6KgKrwx3ooqLcdW3C6qPY/
>>
>> _______________________________________________
>> Lsr mailing list
>> Lsr@ietf.org
>> https://www.ietf.org/mailman/listinfo/lsr
>>
>

--00000000000041e47105a1b2d689
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable


Hi Tony,


Thanks,
Yingzhen

On Tue, Mar 24, 2020 at 5:58 PM To=
ny Przygienda <tonysietf@gmail.co=
m> wrote:
any chance=
 people can post invite.ics I cn import into my agenda? it's really ted=
ious with the timezones & every group announcing the time in different =
way ;-)

Having said that, if we present this topic=
 we could plug in draft-przygienda-lsr-flood-reflection update preso in case Chris=
 wants to do it (for me it's 6am in the morning so I pass). We had an u=
pdate with readability comments and also some procedure/format clarificatio=
ns. Yes, I=C2=A0 think on the list there were voices supporting work in thi=
s area & backing this draft. From our side we see that it 1. works &=
; 2. seems to solve a problem for several customers within the parameters t=
hey set. 

--- to=
ny 

On Tue, Mar 24, 2020 at 3:15 PM Alvaro Re=
tana <a=
lvaro.retana@futurewei.com> wrote:
On Marc=
h 24, 2020 at 1:42:29 PM, Yingzhen Qu wrote:





[Speaking as a WG participant.]=C2=A0 





> Now we have two interim sessions scheduled, please find updated agenda=
 here:=C2=A0 

> https://datatracker.ietf.org/meeting/interim-2020-lsr-01/materi=
als/agenda-interim-2020-lsr-01-lsr-01.html =C2=A0

>=C2=A0 

> If there is any question, please let us know.=C2=A0 





Dear Chairs:=C2=A0 



Hi!=C2=A0 





I have a question, perhaps an early agenda bash.=C2=A0 



The agenda includes presentations of the Area Proxy/TTZ drafts [*].=C2=A0 <=
br>


Acee had sent a message to the WG "asking whether there is a really a =
strong requirement to advance one or more of these documents" [1]. I s=
aw a couple of replies on the list supporting this type of work, but I didn=
't see a discussion related to what specific requirements/issues/"=
places in the network" should be addressed.=C2=A0 



What was the conclusion of the thread?=C2=A0 Are we ready to start/continue=
 discussing the drafts?=C2=A0 





Thanks!=C2=A0 



Alvaro.=C2=A0 





[*] Disclaimer: I am an author on the TTZ draft -- cc'ing Martin just i=
n case an AD is needed at this early stage.=C2=A0 



[1] https://mailarchive.ietf.o=
rg/arch/msg/lsr/Dc1YZd6KgKrwx3ooqLcdW3C6qPY/ =C2=A0



_______________________________________________

Lsr mailing list

Lsr@ietf.org

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





--00000000000041e47105a1b2d689--


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From: "Acee Lindem (acee)" 
To: Tony Przygienda , Alvaro Retana 
CC: "lsr-chairs@ietf.org" , "lsr@ietf.org" , "Vigoureux, Martin (Nokia - FR/Paris-Saclay)" , Yingzhen Qu , "Chris Bowers" 
Thread-Topic: [Lsr] Agenda Posted Re: Link State Routing (lsr) WG Virtual Meeting: 2020-04-02
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Date: Wed, 25 Mar 2020 20:57:38 +0000
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References:  
In-Reply-To: 
From: Tony Przygienda 
Date: Wed, 25 Mar 2020 14:56:28 -0700
Message-ID: 
To: "Acee Lindem (acee)" 
Cc: Yingzhen Qu , "lsr@ietf.org" ,  "lsr-chairs@ietf.org" 
Content-Type: multipart/alternative; boundary="0000000000005e6d2405a1b4f75b"
Archived-At: 
Subject: Re: [Lsr] LSR Interim Invitations (.ics attached)
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yepp, most appreciated ... I will judiciously put a reject filter on
anything coming from Acee or may automatically script text'ing him back if
such a message arrives 18 hours later precisely (which should hit his deep
sleep timezone nicely) ...

if you schedule us into 2nd session that's humanly possible ...

thx ;-)

-- tony

On Wed, Mar 25, 2020 at 4:21 AM Acee Lindem (acee)  wrote:

> Thanks Much Yingzhen! I will text Tony P 15 minutes before the start of
> each meeting =F0=9F=98=89
>
>
>
> Given that the only routing WGs that are meeting next week are LSR and
> IDR, I hope that many of you will have time to read the drafts.
>
>
>
> Thanks,
>
> Acee
>
>
>
> *From: *Yingzhen Qu 
> *Date: *Tuesday, March 24, 2020 at 11:45 PM
> *To: *"lsr@ietf.org" , "lsr-chairs@ietf.org" <
> lsr-chairs@ietf.org>
> *Subject: *LSR Interim Invitations (.ics attached)
> *Resent-From: *
> *Resent-To: *Acee Lindem , Yingzhen Qu <
> yingzhen.ietf@gmail.com>, Christian Hopps 
> *Resent-Date: *Tuesday, March 24, 2020 at 11:44 PM
>
>
>
> Hi all,
>
>
>
> Attached are the invite.ics files for LSR Interim sessions with Webex
> info. Please let me know if there is any questions.
>
>
>
> Thanks,
>
> Yingzhen
> _______________________________________________
> Lsr mailing list
> Lsr@ietf.org
> https://www.ietf.org/mailman/listinfo/lsr
>

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yepp, most appreciated ... I will judiciously put a r=
eject filter on anything coming from Acee or may automatically script text&=
#39;ing him back if such a message arrives 18 hours later precisely (which =
should hit his deep sleep timezone nicely) ... 

if you schedule us into 2nd session that's humanly possible ... 
<=
/div>

thx ;-)

-- tony 
<=
/div>

On Wed, Mar 25, 2020 at 4:21 AM Acee Lindem (acee) <acee=3D40cisco.com@dmarc.ietf.org> w=
rote:











Thanks Much Yingzhen! I will text Tony P 15 minutes =
before the start of each meeting
=F0=9F=98=89


=C2=A0


Given that the only routing WGs that are meeting nex=
t week are LSR and IDR, I hope that many of you will have time to read the =
drafts.


=C2=A0


Thanks,


Acee


=C2=A0




From:
Yingzhen Qu <yingzhen.ietf@gmail=
.com>

Date: Tuesday, March 24, 2020 at 11:45 PM

To: "lsr@ietf=
.org" <lsr@ie=
tf.org>, "lsr-chairs@ietf.org" <lsr-chairs@ietf.org>

Subject: LSR Interim Invitations (.ics attached)

Resent-From: <alias-bounces@ietf.org>

Resent-To: Acee Lindem <acee@cisco.com>, Yingzhen Qu <yingzhen.ietf@gmail.com>, Chri=
stian Hopps <chop=
ps@chopps.org>

Resent-Date: Tuesday, March 24, 2020 at 11:44 PM






=C2=A0






Hi all,



=C2=A0






Attached are the invite.=
ics files for LSR Interim sessions with Webex info. Please let me know if t=
here is any questions.






=C2=A0






Thanks,





Yingzhen









_______________________________________________

Lsr mailing list

Lsr@ietf.org

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




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In-Reply-To: 
From: Tony Przygienda 
Date: Wed, 25 Mar 2020 15:03:51 -0700
Message-ID: 
To: "Acee Lindem (acee)" 
Cc: Alvaro Retana ,  "lsr-chairs@ietf.org" , "lsr@ietf.org" ,  "Vigoureux, Martin (Nokia - FR/Paris-Saclay)" , Yingzhen Qu ,  Chris Bowers 
Content-Type: multipart/alternative; boundary="000000000000cf6a7505a1b51130"
Archived-At: 
Subject: Re: [Lsr] Agenda Posted Re: Link State Routing (lsr) WG Virtual Meeting: 2020-04-02
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Ack.

well, problem real, problem being solved, I would prefer WG getting ahead
of the problem while it is being solved rather than standardizing whatever
ends up already deployed in retrospective :-}  We'll gladly present a draft
update in 2nd session (if Chris doesn't chime in, count me in pls)

As to flood parameters, the whole pressing is coming from usual 3-4 IGP
people generating all the noise all of a sudden ;-) AFAIS but yeah, it's
worth possibly to say something, my opinion there is basically Les's take +
Chris B's take that we could benefit from a configurable constant
advertised to sender. But longish, mildly productive discussion thread
amongst those 3-4 people has been had so 'nuff said ;-)

thanks

--- tony

On Wed, Mar 25, 2020 at 1:57 PM Acee Lindem (acee)  wrote:

> While I never concluded the discussion (until now), but there is very
> little support for the requirement from operators. The flooding reflector
> draft did have the most support with support from one operator who was no=
t
> a co-author on the draft. We could move these presentations to the second
> session and the flood parameters to the first session. However, given the
> paucity of support, I think the direction on flooding parameters is much
> more pressing and deserves more time. At the same time, I don=E2=80=99t s=
ee a
> problem with updates on the drafts as long as the drafts themselves have
> been updated.
>
>
>
> Thanks,
>
> Acee
>
>
>
> *From: *Tony Przygienda 
> *Date: *Tuesday, March 24, 2020 at 8:58 PM
> *To: *Alvaro Retana 
> *Cc: *"lsr-chairs@ietf.org" , "lsr@ietf.org" <
> lsr@ietf.org>, Martin Vigoureux , Yingzhen Qu
> , Chris Bowers 
> *Subject: *Re: [Lsr] Agenda Posted Re: Link State Routing (lsr) WG
> Virtual Meeting: 2020-04-02
> *Resent-From: *
> *Resent-To: *Acee Lindem , Yingzhen Qu <
> yingzhen.ietf@gmail.com>, Christian Hopps 
> *Resent-Date: *Tuesday, March 24, 2020 at 8:58 PM
>
>
>
> any chance people can post invite.ics I cn import into my agenda? it's
> really tedious with the timezones & every group announcing the time in
> different way ;-)
>
>
>
> Having said that, if we present this topic we could plug in draft-przygie=
nda-lsr-flood-reflection
> update preso in case Chris wants to do it (for me it's 6am in the morning
> so I pass). We had an update with readability comments and also some
> procedure/format clarifications. Yes, I  think on the list there were
> voices supporting work in this area & backing this draft. From our side w=
e
> see that it 1. works & 2. seems to solve a problem for several customers
> within the parameters they set.
>
>
>
> --- tony
>
>
>
> On Tue, Mar 24, 2020 at 3:15 PM Alvaro Retana 
> wrote:
>
> On March 24, 2020 at 1:42:29 PM, Yingzhen Qu wrote:
>
>
> [Speaking as a WG participant.]
>
>
> > Now we have two interim sessions scheduled, please find updated agenda
> here:
> >
> https://datatracker.ietf.org/meeting/interim-2020-lsr-01/materials/agenda=
-interim-2020-lsr-01-lsr-01.html
>
> >
> > If there is any question, please let us know.
>
>
> Dear Chairs:
>
> Hi!
>
>
> I have a question, perhaps an early agenda bash.
>
> The agenda includes presentations of the Area Proxy/TTZ drafts [*].
>
> Acee had sent a message to the WG "asking whether there is a really a
> strong requirement to advance one or more of these documents" [1]. I saw =
a
> couple of replies on the list supporting this type of work, but I didn't
> see a discussion related to what specific requirements/issues/"places in
> the network" should be addressed.
>
> What was the conclusion of the thread?  Are we ready to start/continue
> discussing the drafts?
>
>
> Thanks!
>
> Alvaro.
>
>
> [*] Disclaimer: I am an author on the TTZ draft -- cc'ing Martin just in
> case an AD is needed at this early stage.
>
> [1] https://mailarchive.ietf.org/arch/msg/lsr/Dc1YZd6KgKrwx3ooqLcdW3C6qPY=
/
>
>
> _______________________________________________
> Lsr mailing list
> Lsr@ietf.org
> https://www.ietf.org/mailman/listinfo/lsr
>
>

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Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable


Ack. 

well, problem real=
, problem being solved, I would prefer WG getting ahead of the problem whil=
e it is being solved rather than standardizing whatever ends up already dep=
loyed in retrospective :-}=C2=A0 We'll gladly present a draft update in=
 2nd session (if Chris doesn't chime in, count me in pls)

As to flood parameters, the whole pressing is coming from u=
sual 3-4 IGP people generating all the noise all of a sudden ;-) AFAIS but =
yeah, it's worth possibly to say something, my opinion there is basical=
ly Les's take + Chris B's take that we could benefit from a configu=
rable constant advertised to sender. But longish, mildly productive discuss=
ion thread amongst those 3-4 people has been had so 'nuff said ;-) 
=


thanks 

--- tony 

On Wed, Mar 25, 2020 at 1:57 PM Acee Lindem (acee) <acee@cisco.com> wrote:











While I never concluded the discussion (until now), =
but there is very little support for the requirement from operators. The fl=
ooding reflector draft did have the most support with support from one oper=
ator who was not a co-author on the
 draft. We could move these presentations to the second session and the flo=
od parameters to the first session. However, given the paucity of support, =
I think the direction on flooding parameters is much more pressing and dese=
rves more time. At the same time,
 I don=E2=80=99t see a problem with updates on the drafts as long as the dr=
afts themselves have been updated.



=C2=A0


Thanks,


Acee


=C2=A0




From:
Tony Przygienda <<=
a href=3D"mailto:tonysietf@gmail.com" target=3D"_blank">tonysietf@gmail.com=
>

Date: Tuesday, March 24, 2020 at 8:58 PM

To: Alvaro Retana <alvaro.retana@futurewei.com>

Cc: "l=
sr-chairs@ietf.org" <lsr-chairs@ietf.org>, "lsr@ietf.org" <lsr@ietf.org>, Martin Vigoureux <martin.vigoureux=
@nokia.com>, Yingzhen Qu <yingzhen.qu@futurewei.com>, Chris Bowers <=
;cbowers@juniper.n=
et>

Subject: Re: [Lsr] Agenda Posted Re: Link State Routing (lsr) WG Vir=
tual Meeting: 2020-04-02

Resent-From: <alias-bounces@ietf.org>

Resent-To: Acee Lindem <acee@cisco.com>, Yingzhen Qu <yingzhen.ietf@gmail.com>, Chri=
stian Hopps <chop=
ps@chopps.org>

Resent-Date: Tuesday, March 24, 2020 at 8:58 PM=







=C2=A0








any chance people can po=
st invite.ics I cn import into my agenda? it's really tedious with the =
timezones & every group announcing the time in different way ;-)=







=C2=A0






Having said that, if we =
present this topic we could plug in
draft-przygienda-lsr-flood-reflection update preso in case Chris wants t=
o do it (for me it's 6am in the morning so I pass). We had an update wi=
th readability comments and
 also some procedure/format clarifications. Yes, I=C2=A0 think on the list =
there were voices supporting work in this area & backing this draft. Fr=
om our side we see that it 1. works & 2. seems to solve a problem for s=
everal customers within the parameters they set.







=C2=A0






--- tony







=C2=A0






On Tue, Mar 24, 2020 at =
3:15 PM Alvaro Retana <alvaro.retana@futurewei.com> wrote:





On March 24, 2020 at 1:4=
2:29 PM, Yingzhen Qu wrote:





[Speaking as a WG participant.]=C2=A0 





> Now we have two interim sessions scheduled, please find updated agenda=
 here:=C2=A0 

> 
https://datatracker.ietf.org/meeting/interim-2020-lsr-01/materials/agenda-i=
nterim-2020-lsr-01-lsr-01.html =C2=A0

>=C2=A0 

> If there is any question, please let us know.=C2=A0 





Dear Chairs:=C2=A0 



Hi!=C2=A0 





I have a question, perhaps an early agenda bash.=C2=A0 



The agenda includes presentations of the Area Proxy/TTZ drafts [*].=C2=A0 <=
br>


Acee had sent a message to the WG "asking whether there is a really a =
strong requirement to advance one or more of these documents" [1]. I s=
aw a couple of replies on the list supporting this type of work, but I didn=
't see a discussion related to what specific
 requirements/issues/"places in the network" should be addressed.=
=C2=A0 



What was the conclusion of the thread?=C2=A0 Are we ready to start/continue=
 discussing the drafts?=C2=A0






Thanks!=C2=A0 



Alvaro.=C2=A0 





[*] Disclaimer: I am an author on the TTZ draft -- cc'ing Martin just i=
n case an AD is needed at this early stage.=C2=A0




[1] 
https://mailarchive.ietf.org/arch/msg/lsr/Dc1YZd6KgKrwx3ooqLcdW3C6qPY/ =
=C2=A0



_______________________________________________

Lsr mailing list

Lsr@ietf.org

htt=
ps://www.ietf.org/mailman/listinfo/lsr













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From: Christian Hopps 
In-Reply-To: 
Date: Wed, 25 Mar 2020 18:38:20 -0400
Cc: Christian Hopps , "Acee Lindem (acee)" , Yingzhen Qu , "lsr@ietf.org" , "lsr-chairs@ietf.org" 
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References:   
To: Tony Przygienda 
X-Mailer: Apple Mail (2.3608.60.0.2.5)
Archived-At: 
Subject: Re: [Lsr] LSR Interim Invitations (.ics attached)
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It looks like your presentation is currently slated for 7am PT (FWIW =
this is 10pm Japan/Korea time). Is that too early?

Thanks,
Chris.

> On Mar 25, 2020, at 5:56 PM, Tony Przygienda  =
wrote:
>=20
> yepp, most appreciated ... I will judiciously put a reject filter on =
anything coming from Acee or may automatically script text'ing him back =
if such a message arrives 18 hours later precisely (which should hit his =
deep sleep timezone nicely) ...=20
>=20
> if you schedule us into 2nd session that's humanly possible ...=20
>=20
> thx ;-)
>=20
> -- tony=20
>=20
> On Wed, Mar 25, 2020 at 4:21 AM Acee Lindem (acee) =
 wrote:
> Thanks Much Yingzhen! I will text Tony P 15 minutes before the start =
of each meeting =F0=9F=98=89
>=20
> =20
>=20
> Given that the only routing WGs that are meeting next week are LSR and =
IDR, I hope that many of you will have time to read the drafts.
>=20
> =20
>=20
> Thanks,
>=20
> Acee
>=20
> =20
>=20
> From: Yingzhen Qu 
> Date: Tuesday, March 24, 2020 at 11:45 PM
> To: "lsr@ietf.org" , "lsr-chairs@ietf.org" =

> Subject: LSR Interim Invitations (.ics attached)
> Resent-From: 
> Resent-To: Acee Lindem , Yingzhen Qu =
, Christian Hopps 
> Resent-Date: Tuesday, March 24, 2020 at 11:44 PM
>=20
> =20
>=20
> Hi all,
>=20
> =20
>=20
> Attached are the invite.ics files for LSR Interim sessions with Webex =
info. Please let me know if there is any questions.
>=20
> =20
>=20
> Thanks,
>=20
> Yingzhen
>=20
> _______________________________________________
> Lsr mailing list
> Lsr@ietf.org
> https://www.ietf.org/mailman/listinfo/lsr


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From: Tony Przygienda 
Date: Wed, 25 Mar 2020 17:13:04 -0700
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To: Christian Hopps 
Cc: "Acee Lindem (acee)" , Yingzhen Qu ,  "lsr@ietf.org" , "lsr-chairs@ietf.org" 
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Chris, I suffered through harsher things for IGPs in my life ;-) Seriously,
thanks, 7AM is fine ...

Acee, send me a nastygram @ 6.30AM then ;-)

--- tony

On Wed, Mar 25, 2020 at 3:38 PM Christian Hopps  wrote:

> It looks like your presentation is currently slated for 7am PT (FWIW this
> is 10pm Japan/Korea time). Is that too early?
>
> Thanks,
> Chris.
>
> > On Mar 25, 2020, at 5:56 PM, Tony Przygienda 
> wrote:
> >
> > yepp, most appreciated ... I will judiciously put a reject filter on
> anything coming from Acee or may automatically script text'ing him back i=
f
> such a message arrives 18 hours later precisely (which should hit his dee=
p
> sleep timezone nicely) ...
> >
> > if you schedule us into 2nd session that's humanly possible ...
> >
> > thx ;-)
> >
> > -- tony
> >
> > On Wed, Mar 25, 2020 at 4:21 AM Acee Lindem (acee)  40cisco.com@dmarc.ietf.org> wrote:
> > Thanks Much Yingzhen! I will text Tony P 15 minutes before the start of
> each meeting =F0=9F=98=89
> >
> >
> >
> > Given that the only routing WGs that are meeting next week are LSR and
> IDR, I hope that many of you will have time to read the drafts.
> >
> >
> >
> > Thanks,
> >
> > Acee
> >
> >
> >
> > From: Yingzhen Qu 
> > Date: Tuesday, March 24, 2020 at 11:45 PM
> > To: "lsr@ietf.org" , "lsr-chairs@ietf.org" <
> lsr-chairs@ietf.org>
> > Subject: LSR Interim Invitations (.ics attached)
> > Resent-From: 
> > Resent-To: Acee Lindem , Yingzhen Qu <
> yingzhen.ietf@gmail.com>, Christian Hopps 
> > Resent-Date: Tuesday, March 24, 2020 at 11:44 PM
> >
> >
> >
> > Hi all,
> >
> >
> >
> > Attached are the invite.ics files for LSR Interim sessions with Webex
> info. Please let me know if there is any questions.
> >
> >
> >
> > Thanks,
> >
> > Yingzhen
> >
> > _______________________________________________
> > Lsr mailing list
> > Lsr@ietf.org
> > https://www.ietf.org/mailman/listinfo/lsr
>
>

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Chris, I suffered through harsher things for IGPs in =
my life ;-) Seriously, thanks, 7AM is fine ... 

Acee, send me a nastygram @ 6.30AM then ;-) 

--- tony 

On Wed, Mar 25, 2020 at 3:38 PM Christian Hopps <chopps@chopps.org> wrote:
It looks like your prese=
ntation is currently slated for 7am PT (FWIW this is 10pm Japan/Korea time)=
. Is that too early?



Thanks,

Chris.



> On Mar 25, 2020, at 5:56 PM, Tony Przygienda <tonysietf@gmail.com> wrote:

> 

> yepp, most appreciated ... I will judiciously put a reject filter on a=
nything coming from Acee or may automatically script text'ing him back =
if such a message arrives 18 hours later precisely (which should hit his de=
ep sleep timezone nicely) ... 

> 

> if you schedule us into 2nd session that's humanly possible ... 
> 

> thx ;-)

> 

> -- tony 

> 

> On Wed, Mar 25, 2020 at 4:21 AM Acee Lindem (acee) <acee=3D40cisco.com@dmarc.=
ietf.org> wrote:

> Thanks Much Yingzhen! I will text Tony P 15 minutes before the start o=
f each meeting =F0=9F=98=89

> 

>=C2=A0 

> 

> Given that the only routing WGs that are meeting next week are LSR and=
 IDR, I hope that many of you will have time to read the drafts.

> 

>=C2=A0 

> 

> Thanks,

> 

> Acee

> 

>=C2=A0 

> 

> From: Yingzhen Qu <yingzhen.ietf@gmail.com>

> Date: Tuesday, March 24, 2020 at 11:45 PM

> To: "lsr@ietf.o=
rg" <lsr@ietf=
.org>, "lsr-chairs@ietf.org" <lsr-chairs@ietf.org>

> Subject: LSR Interim Invitations (.ics attached)

> Resent-From: <alias-bounces@ietf.org>

> Resent-To: Acee Lindem <acee@cisco.com>, Yingzhen Qu <yingzhen.ietf@gmail.com>, Christi=
an Hopps <chopps@=
chopps.org>

> Resent-Date: Tuesday, March 24, 2020 at 11:44 PM

> 

>=C2=A0 

> 

> Hi all,

> 

>=C2=A0 

> 

> Attached are the invite.ics files for LSR Interim sessions with Webex =
info. Please let me know if there is any questions.

> 

>=C2=A0 

> 

> Thanks,

> 

> Yingzhen

> 

> _______________________________________________

> Lsr mailing list

> Lsr@ietf.org

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






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------=_001_NextPart806557730502_=----
Content-Type: text/html;
	charset="ISO-8859-1"
Content-Transfer-Encoding: quoted-printable

=0A

Hi, Joel,
=0A
The statement is that pure overlay VP=
Ns cannot meet the requirement of some new services, and it would require =
integration between the underlay and the overlay networks.
As mentioned in this document, there is existing technology in the=
 underlay to support enhanced VPNs , such as using a set of MPLS-TE based =
resource reserved point-to-point paths, while it scalability is the concer=
n of many operators.
 
Thus VTN is introduced to provide =
the required topology and resource attribute in the underlay in a scalable=
 manner. This is described in the introduction section.<=
/p>
 <=
/span>
=
Hope this helps.

Chongfeng

Date: 2020-03-25 21:52
To: xiechf@chinat=
elecom.cn; lsr
Subjec=
t: Re: [Lsr] Using IS-IS Multi-Topology (MT) for Segment Routing =
based Virtual Transport Network
This drafts sta=
rts by asserting that there are limitations on what can 
=0A
be d=
one with the existing technology.  As the description is quite 
=
=0A
vague, I can not be certain.  But I do not know of any diffic=
ulty in 
=0A
providing the described capabilities with current te=
chnology, without 
=0A
introducing a new, undescribed, construct =
called a VTN.
=0A
 
=0A
Yours,
=0A
Joel=0A
 
=0A
On 3/25/2020 9:44 AM, xiechf@chinatelecom.c=
n wrote:
=0A
> 
=0A
> Hello, folks,
=0A
&=
gt; 
=0A
> we have submitted a new draft of 
=0A
>=
   https://tools.ietf.org/html/draft-xie-lsr-isis-sr-vtn-mt-00 .=

=0A
> 
=0A
> It is about Using IS-IS Multi-Topolo=
gy (MT) for Segment Routing based 
=0A
> Virtual Transport Net=
work. Enhanced VPN (VPN+) as defined in 
=0A
> I-D.ietf-teas-e=
nhanced-vpn aims to provide enhanced VPN service to 
=0A
> sup=
port some applications's needs of enhanced isolation and stringent 
=
=0A
> performance requirements.  VPN+ requries integration bet=
ween the overlay 
=0A
> VPN and the underlay network.  A =
Virtual Transport Network (VTN) is a 
=0A
> virtual network wh=
ich consists of a subset of the network toplogy and 
=0A
> net=
work resources allocated from the underlay network.  A VTN could be <=
/div>=0A
> used as the underlay for one or a group of VPN+ services=
. This document 
=0A
> describes a simplified mechanism to bui=
ld the SR based VTNs using IGP 
=0A
> multi- topology together=
 with other well-defined IS-IS extensions.
=0A
> 
=0A> Comments and suggestions are highly appreciated.
=0A
> <=
/div>=0A
> Chongfeng Xie
=0A
> 
=0A
> =0A
> 
=0A
> _________________________________________=
______
=0A
> Lsr mailing list
=0A
> Lsr@ietf.org=0A
> https://www.ietf.org/mailman/listinfo/lsr
=0A
&g=
t; 
=0A
 
=0A
_____________________________________=
__________
=0A
Lsr mailing list
=0A
Lsr@ietf.org
=
=0A
https://www.ietf.org/mailman/listinfo/lsr
=0A
 =0A
=0A
------=_001_NextPart806557730502_=------


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From: "Dongjie (Jimmy)" 
To: Peter Psenak , "xiechf@chinatelecom.cn" , lsr 
Thread-Topic: [Lsr] Using IS-IS Multi-Topology (MT) for Segment Routing based Virtual Transport Network
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Hi Dongjie,

On 26/03/2020 07:40, Dongjie (Jimmy) wrote:
> Hi Peter,
> 
> As described in the abstract, the purpose of this draft is to define a simplified control plane mechanism to build SR based Virtual Transport Network (VTN), it is based on the combination of IS-IS Multi-Topology with other IS-IS extensions, e.g. the extensions for TE, SR and L2 bundle. In a word, it tries to reuse the existing TLVs as much as possible.

reusing the TLVs is not something that needs a standardization.

> 
> That said, this document introduces the mechanism of specifying per-topology TE attributes, which was not covered in the existing IS-IS MT (RFC 5120). 

I can clearly see that TLVs defined in RFC5120 are listed in the 
registry of sub-TLVs available for TLV 222/223

https://www.iana.org/assignments/isis-tlv-codepoints/isis-tlv-codepoints.xhtml#isis-tlv-codepoints-22-23-25-141-222-223

So I'm not sure what you are adding.

>Similarly, it also introduces the mechanism of associating MT-IDs with a particular member link of L2 bundle, which was not defined in IS-IS L2 Bundle (RFC 8668).

carrying MT-ID in the L2 Bundle TLV is conceptually wrong.

It is the parent L3 link which has the association with the particular 
topology ID, you can not change the topology per L2 link member.

You are trying to overload the MT-ID with the VTN semantics, but you can 
not do it here. If you need a VTN ID for the L2 member link, which I'm 
not sure why, you need to define a a new attribute and not mix it with 
MT-ID.


thanks,
Peter


> 
> Thus we think it is appropriate to be standard track.
> 
> Best regards,
> Jie
> 
>> -----Original Message-----
>> From: Lsr [mailto:lsr-bounces@ietf.org] On Behalf Of Peter Psenak
>> Sent: Wednesday, March 25, 2020 10:09 PM
>> To: xiechf@chinatelecom.cn; lsr 
>> Subject: Re: [Lsr] Using IS-IS Multi-Topology (MT) for Segment Routing based
>> Virtual Transport Network
>>
>> Hi Chongfeng,
>>
>> what exactly is being standardized in this draft? I don't see anything.
>>
>> thanks,
>> Peter
>>
>>
>> On 25/03/2020 14:44, xiechf@chinatelecom.cn wrote:
>>>
>>> Hello, folks,
>>>
>>> we have submitted a new draft of
>>>    https://tools.ietf.org/html/draft-xie-lsr-isis-sr-vtn-mt-00 .
>>>
>>> It is about Using IS-IS Multi-Topology (MT) for Segment Routing based
>>> Virtual Transport Network. Enhanced VPN (VPN+) as defined in
>>> I-D.ietf-teas-enhanced-vpn aims to provide enhanced VPN service to
>>> support some applications's needs of enhanced isolation and stringent
>>> performance requirements.  VPN+ requries integration between the
>>> overlay VPN and the underlay network.  A Virtual Transport Network
>>> (VTN) is a virtual network which consists of a subset of the network
>>> toplogy and network resources allocated from the underlay network.  A
>>> VTN could be used as the underlay for one or a group of VPN+ services.
>>> This document describes a simplified mechanism to build the SR based
>>> VTNs using IGP
>>> multi- topology together with other well-defined IS-IS extensions.
>>>
>>> Comments and suggestions are highly appreciated.
>>>
>>> Chongfeng Xie
>>>
>>>
>>
>> _______________________________________________
>> Lsr mailing list
>> Lsr@ietf.org
>> https://www.ietf.org/mailman/listinfo/lsr
> 
> 


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From: "Dongjie (Jimmy)" 
To: Peter Psenak , "xiechf@chinatelecom.cn" , lsr 
Thread-Topic: [Lsr] Using IS-IS Multi-Topology (MT) for Segment Routing based Virtual Transport Network
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Date: Thu, 26 Mar 2020 10:57:40 +0000
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To: "Dongjie (Jimmy)" , "xiechf@chinatelecom.cn" , lsr 
References: <2020032521444882209619@chinatelecom.cn> <950e7309-f077-2162-5150-db88913eb3a6@cisco.com> <9f173e8b3c374863ba1054a9c22585a7@huawei.com> <3d9953c8-46c6-21a4-6ba5-2688c5615bdb@cisco.com> <8bb4e17d014b41f1a394b3e555d26824@huawei.com>
From: Peter Psenak 
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Date: Thu, 26 Mar 2020 12:02:54 +0100
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Subject: Re: [Lsr] Using IS-IS Multi-Topology (MT) for Segment Routing based Virtual Transport Network
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Hi Dongjie,

On 26/03/2020 11:57, Dongjie (Jimmy) wrote:
> Hi Peter,
> 
> Thanks for your comments.
> 
>> -----Original Message-----
>> From: Peter Psenak [mailto:ppsenak@cisco.com]
>> Sent: Thursday, March 26, 2020 5:23 PM
>> To: Dongjie (Jimmy) ; xiechf@chinatelecom.cn; lsr
>> 
>> Subject: Re: [Lsr] Using IS-IS Multi-Topology (MT) for Segment Routing based
>> Virtual Transport Network
>>
>> Hi Dongjie,
>>
>> On 26/03/2020 07:40, Dongjie (Jimmy) wrote:
>>> Hi Peter,
>>>
>>> As described in the abstract, the purpose of this draft is to define a simplified
>> control plane mechanism to build SR based Virtual Transport Network (VTN), it
>> is based on the combination of IS-IS Multi-Topology with other IS-IS extensions,
>> e.g. the extensions for TE, SR and L2 bundle. In a word, it tries to reuse the
>> existing TLVs as much as possible.
>>
>> reusing the TLVs is not something that needs a standardization.
>>
>>>
>>> That said, this document introduces the mechanism of specifying
>> per-topology TE attributes, which was not covered in the existing IS-IS MT (RFC
>> 5120).
>>
>> I can clearly see that TLVs defined in RFC5120 are listed in the registry of
>> sub-TLVs available for TLV 222/223
>>
>> https://www.iana.org/assignments/isis-tlv-codepoints/isis-tlv-codepoints.xhtm
>> l#isis-tlv-codepoints-22-23-25-141-222-223
>>
>> So I'm not sure what you are adding.
> 
> In RFC 5120 section 7, it says that
> 
> “If traffic engineering or some other applications are being applied per topology level later, the new TLVs can automatically inherit the same attributes already defined for the "standard" topology without going through long standard process to redefine them per topology.”
> 
> This indicates that per-topology TE attributes is not a feature specified in RFC5120, although the TLVs can be reused.

the text above clearly says there is no standardization required.

> 
> Although the IANA registry shows that all the TE attributes could be used in TLV 222/223, this was not specified in RFC 5120 (or other RFCs I'm aware of), could you help to provide the reference to such IANA specification? In addition, it seems not all of the TE attributes are suitable to be carried at per-topology level. Thus the IANA registry may need to be updated.
> 
>>> Similarly, it also introduces the mechanism of associating MT-IDs with a
>> particular member link of L2 bundle, which was not defined in IS-IS L2 Bundle
>> (RFC 8668).
>>
>> carrying MT-ID in the L2 Bundle TLV is conceptually wrong.
>>
>> It is the parent L3 link which has the association with the particular topology
>> ID, you can not change the topology per L2 link member.
>>
>> You are trying to overload the MT-ID with the VTN semantics, but you can not
>> do it here. If you need a VTN ID for the L2 member link, which I'm not sure
>> why, you need to define a a new attribute and not mix it with MT-ID.
> 
> In this document we try to reuse the existing IDs and TLVs to fulfil the functionality required. Since several existing TLVs defined for L3 link have been introduced for the L2 bundle member, we are considering the possibility of also carrying MT-ID as another attribute of the member link. Could you elaborate why it cannot be reused? Of course defining a new VTN-ID is another option. We are open to discussion about this.

the reason is simple - the L3 link is already associated with the MT-ID. 
You can not change the MT-ID of the underlying L2 link.

thanks,
Peter

> 
> Best regards,
> Jie
> 
>>
>> thanks,
>> Peter
>>
>>
>>>
>>> Thus we think it is appropriate to be standard track.
>>>
>>> Best regards,
>>> Jie
>>>
>>>> -----Original Message-----
>>>> From: Lsr [mailto:lsr-bounces@ietf.org] On Behalf Of Peter Psenak
>>>> Sent: Wednesday, March 25, 2020 10:09 PM
>>>> To: xiechf@chinatelecom.cn; lsr 
>>>> Subject: Re: [Lsr] Using IS-IS Multi-Topology (MT) for Segment
>>>> Routing based Virtual Transport Network
>>>>
>>>> Hi Chongfeng,
>>>>
>>>> what exactly is being standardized in this draft? I don't see anything.
>>>>
>>>> thanks,
>>>> Peter
>>>>
>>>>
>>>> On 25/03/2020 14:44, xiechf@chinatelecom.cn wrote:
>>>>>
>>>>> Hello, folks,
>>>>>
>>>>> we have submitted a new draft of
>>>>>     https://tools.ietf.org/html/draft-xie-lsr-isis-sr-vtn-mt-00 .
>>>>>
>>>>> It is about Using IS-IS Multi-Topology (MT) for Segment Routing
>>>>> based Virtual Transport Network. Enhanced VPN (VPN+) as defined in
>>>>> I-D.ietf-teas-enhanced-vpn aims to provide enhanced VPN service to
>>>>> support some applications's needs of enhanced isolation and
>>>>> stringent performance requirements.  VPN+ requries integration
>>>>> between the overlay VPN and the underlay network.  A Virtual
>>>>> Transport Network
>>>>> (VTN) is a virtual network which consists of a subset of the network
>>>>> toplogy and network resources allocated from the underlay network.
>>>>> A VTN could be used as the underlay for one or a group of VPN+ services.
>>>>> This document describes a simplified mechanism to build the SR based
>>>>> VTNs using IGP
>>>>> multi- topology together with other well-defined IS-IS extensions.
>>>>>
>>>>> Comments and suggestions are highly appreciated.
>>>>>
>>>>> Chongfeng Xie
>>>>>
>>>>>
>>>>
>>>> _______________________________________________
>>>> Lsr mailing list
>>>> Lsr@ietf.org
>>>> https://www.ietf.org/mailman/listinfo/lsr
>>>
>>>
> 
> 
> 


From nobody Thu Mar 26 06:36:04 2020
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To: "xiechf@chinatelecom.cn" , lsr 
References: <2020032521444882209619@chinatelecom.cn> <9f717ab0-96f4-c20f-f80a-ea7ea527a01a@joelhalpern.com> <2020032613401931877336@chinatelecom.cn>
From: "Joel M. Halpern" 
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Date: Thu, 26 Mar 2020 09:35:57 -0400
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Subject: Re: [Lsr] Using IS-IS Multi-Topology (MT) for Segment Routing based Virtual Transport Network
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In once sense, the statement is inherently true.  A VPN technology 
without underlay support would seem to have significant difficulty in 
consistently meeting an SLA.  Having said that much, the rest does not 
seem to follow.

Yours,
Joel

On 3/26/2020 1:40 AM, xiechf@chinatelecom.cn wrote:
> 
> Hi, Joel,
> 
> The statement is that pure overlay VPNs cannot meet the requirement of 
> some new services, and it would require integration between the underlay 
> and the overlay networks.
> 
> As mentioned in this document, there is existing technology in the 
> underlay to support enhanced VPNs , such as using a set of MPLS-TE based 
> resource reserved point-to-point paths, while it scalability is the 
> concern of many operators.
> 
> Thus VTN is introduced to provide the required topology and resource 
> attribute in the underlay in a scalable manner. This is described in the 
> introduction section.
> 
> Hope this helps.
> 
> 
> Chongfeng
> 
> 
>     *From:* Joel M. Halpern 
>     *Date:*2020-03-2521:52
>     *To:* xiechf@chinatelecom.cn ; lsr
>     
>     *Subject:*Re: [Lsr] Using IS-IS Multi-Topology (MT) for Segment
>     Routing based Virtual Transport Network
>     This drafts starts by asserting that there are limitations on what can
>     be done with the existing technology. As the description is quite
>     vague, I can not be certain. But I do not know of any difficulty in
>     providing the described capabilities with current technology, without
>     introducing a new, undescribed, construct called a VTN.
>     Yours,
>     Joel
>     On 3/25/2020 9:44 AM, xiechf@chinatelecom.cn wrote:
>      >
>      > Hello, folks,
>      >
>      > we have submitted a new draft of
>      > https://tools.ietf.org/html/draft-xie-lsr-isis-sr-vtn-mt-00 .
>      >
>      > It is about Using IS-IS Multi-Topology (MT) for Segment Routing
>     based
>      > Virtual Transport Network. Enhanced VPN (VPN+) as defined in
>      > I-D.ietf-teas-enhanced-vpn aims to provide enhanced VPN service to
>      > support some applications's needs of enhanced isolation and
>     stringent
>      > performance requirements. VPN+ requries integration between the
>     overlay
>      > VPN and the underlay network. A Virtual Transport Network (VTN)
>     is a
>      > virtual network which consists of a subset of the network toplogy
>     and
>      > network resources allocated from the underlay network. A VTN
>     could be
>      > used as the underlay for one or a group of VPN+ services.. This
>     document
>      > describes a simplified mechanism to build the SR based VTNs using
>     IGP
>      > multi- topology together with other well-defined IS-IS extensions.
>      >
>      > Comments and suggestions are highly appreciated.
>      >
>      > Chongfeng Xie
>      >
>      >
>      >
>      > _______________________________________________
>      > 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
> 
> 
> _______________________________________________
> Lsr mailing list
> Lsr@ietf.org
> https://www.ietf.org/mailman/listinfo/lsr
> 


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From: John E Drake 
To: "Joel M. Halpern" , "xiechf@chinatelecom.cn" , lsr 
Thread-Topic: [Lsr] Using IS-IS Multi-Topology (MT) for Segment Routing based Virtual Transport Network
Thread-Index: AQHWAqunJgnkEdaIE0esgKz1qRvkkahZVAKAgAEI9RSAAISngIAAHtHw
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Subject: Re: [Lsr] Using IS-IS Multi-Topology (MT) for Segment Routing based Virtual Transport Network
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Hi,

As Joel notes, it is true that enhanced VPNs require the use of specific un=
derlay network resources, either dedicated or shared, but the this needs to=
 be done without installing overlay VPN awareness in the P routers, which i=
s inherently unscalable and operationally complex.  Also, since VPNs span m=
ultiple ASes, putting overlay VPN state in an IGP doesn't work.=20

Please see:  https://tools.ietf.org/html/draft-drake-bess-enhanced-vpn-02

Yours Irrespectively,

John


Juniper Business Use Only

> -----Original Message-----
> From: Lsr  On Behalf Of Joel M. Halpern
> Sent: Thursday, March 26, 2020 9:36 AM
> To: xiechf@chinatelecom.cn; lsr 
> Subject: Re: [Lsr] Using IS-IS Multi-Topology (MT) for Segment Routing ba=
sed
> Virtual Transport Network
>=20
> [External Email. Be cautious of content]
>=20
>=20
> In once sense, the statement is inherently true.  A VPN technology withou=
t
> underlay support would seem to have significant difficulty in consistentl=
y
> meeting an SLA.  Having said that much, the rest does not seem to follow.
>=20
> Yours,
> Joel
>=20
> On 3/26/2020 1:40 AM, xiechf@chinatelecom.cn wrote:
> >
> > Hi, Joel,
> >
> > The statement is that pure overlay VPNs cannot meet the requirement of
> > some new services, and it would require integration between the
> > underlay and the overlay networks.
> >
> > As mentioned in this document, there is existing technology in the
> > underlay to support enhanced VPNs , such as using a set of MPLS-TE
> > based resource reserved point-to-point paths, while it scalability is
> > the concern of many operators.
> >
> > Thus VTN is introduced to provide the required topology and resource
> > attribute in the underlay in a scalable manner. This is described in
> > the introduction section.
> >
> > Hope this helps.
> >
> >
> > Chongfeng
> >
> >
> >     *From:* Joel M. Halpern 
> >     *Date:* 2020-03-25 21:52
> >     *To:* xiechf@chinatelecom.cn ; lsr
> >     
> >     *Subject:* Re: [Lsr] Using IS-IS Multi-Topology (MT) for Segment
> >     Routing based Virtual Transport Network
> >     This drafts starts by asserting that there are limitations on what =
can
> >     be done with the existing technology.  As the description is quite
> >     vague, I can not be certain.  But I do not know of any difficulty i=
n
> >     providing the described capabilities with current technology, witho=
ut
> >     introducing a new, undescribed, construct called a VTN.
> >     Yours,
> >     Joel
> >     On 3/25/2020 9:44 AM, xiechf@chinatelecom.cn wrote:
> >      >
> >      > Hello, folks,
> >      >
> >      > we have submitted a new draft of
> >      >=A0  https://urldefense.com/v3/__https://tools.ietf.org/html/draf=
t-xie-lsr-
> isis-sr-vtn-mt-00__;!!NEt6yMaO-gk!UC57ahoSTr0MI_h20crJfu--
> 3Q_Skbm0IIKvdcQHjUvsVslOpTl1bsfyXyHvpt8$  .
> >      >
> >      > It is about Using IS-IS Multi-Topology (MT) for Segment Routing
> >     based
> >      > Virtual Transport Network. Enhanced VPN (VPN+) as defined in
> >      > I-D.ietf-teas-enhanced-vpn aims to provide enhanced VPN service =
to
> >      > support some applications's needs of enhanced isolation and
> >     stringent
> >      > performance requirements.  VPN+ requries integration between the
> >     overlay
> >      > VPN and the underlay network.  A Virtual Transport Network (VTN)
> >     is a
> >      > virtual network which consists of a subset of the network toplog=
y
> >     and
> >      > network resources allocated from the underlay network.  A VTN
> >     could be
> >      > used as the underlay for one or a group of VPN+ services.. This
> >     document
> >      > describes a simplified mechanism to build the SR based VTNs usin=
g
> >     IGP
> >      > multi- topology together with other well-defined IS-IS extension=
s.
> >      >
> >      > Comments and suggestions are highly appreciated.
> >      >
> >      > Chongfeng Xie
> >      >
> >      >
> >      >
> >      > _______________________________________________
> >      > Lsr mailing list
> >      > Lsr@ietf.org
> >      >
> https://urldefense.com/v3/__https://www.ietf.org/mailman/listinfo/lsr__;!=
!NEt
> 6yMaO-gk!UC57ahoSTr0MI_h20crJfu--
> 3Q_Skbm0IIKvdcQHjUvsVslOpTl1bsfyCiP9TE0$
> >      >
> >     _______________________________________________
> >     Lsr mailing list
> >     Lsr@ietf.org
> >
> > https://urldefense.com/v3/__https://www.ietf.org/mailman/listinfo/lsr_
> > _;!!NEt6yMaO-gk!UC57ahoSTr0MI_h20crJfu--
> 3Q_Skbm0IIKvdcQHjUvsVslOpTl1bs
> > fyCiP9TE0$
> >
> >
> > _______________________________________________
> > Lsr mailing list
> > Lsr@ietf.org
> > https://urldefense.com/v3/__https://www.ietf.org/mailman/listinfo/lsr_
> > _;!!NEt6yMaO-gk!UC57ahoSTr0MI_h20crJfu--
> 3Q_Skbm0IIKvdcQHjUvsVslOpTl1bs
> > fyCiP9TE0$
> >
>=20
> _______________________________________________
> Lsr mailing list
> Lsr@ietf.org
> https://urldefense.com/v3/__https://www.ietf.org/mailman/listinfo/lsr__;!=
!NEt
> 6yMaO-gk!UC57ahoSTr0MI_h20crJfu--
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From: "Les Ginsberg (ginsberg)" 
To: "Dongjie (Jimmy)" , Peter Psenak , "xiechf@chinatelecom.cn" , lsr 
Thread-Topic: [Lsr] Using IS-IS Multi-Topology (MT) for Segment Routing based Virtual Transport Network
Thread-Index: AQHWAquynX53fIMXl0m/aKa+FdU6vKhZWHCAgAEVPYCAAJxaUA==
Date: Thu, 26 Mar 2020 16:04:53 +0000
Message-ID: 
References: <2020032521444882209619@chinatelecom.cn> <950e7309-f077-2162-5150-db88913eb3a6@cisco.com> <9f173e8b3c374863ba1054a9c22585a7@huawei.com>
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From: Yingzhen Qu 
Date: Thu, 26 Mar 2020 13:39:23 -0700
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To: lsr@ietf.org, lsr-chairs@ietf.org
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Subject: [Lsr] Slides for Interim Meeting
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--00000000000095ba8405a1c7fbec
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Hi presenters,

Please send your slides to lsr-chairs@ietf.org before the end of this month
(3/31).

Thanks,
Yingzhen

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Hi presenters,

Please send your sli=
des to lsr-chairs@ietf.org befor=
e the end of this month (3/31).=C2=A0

Thanks,
Yingzhen


--00000000000095ba8405a1c7fbec--


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From: Yingzhen Qu 
Date: Thu, 26 Mar 2020 13:47:54 -0700
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To: lsr@ietf.org, lsr-chairs@ietf.org
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Subject: Re: [Lsr] Slides for Interim Meeting
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Forgot to mention this deadline is for meeting session #1 presenters.

Thanks,
Yingzhen

On Thu, Mar 26, 2020 at 1:39 PM Yingzhen Qu  wrote:

> Hi presenters,
>
> Please send your slides to lsr-chairs@ietf.org before the end of this
> month (3/31).
>
> Thanks,
> Yingzhen
>

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Forgot to mention this deadline is for meeting session #1 =
presenters.

Thanks,
Yingzhen

On Thu, Mar =
26, 2020 at 1:39 PM Yingzhen Qu <yingzhen.ietf@gmail.com> wrote:
Hi presenters,

Please send your slides to=
 lsr-chairs@ietf.o=
rg before the end of this month (3/31).=C2=A0

=
Thanks,
Yingzhen




--00000000000013686b05a1c81ae8--


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Cc: "Joel M. Halpern" , "xiechf@chinatelecom.cn" , lsr 
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To: John E Drake 
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Subject: Re: [Lsr] Using IS-IS Multi-Topology (MT) for Segment Routing based Virtual Transport Network
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Hi, John:
In your proposal, there is the following text =E2=80=9C the network controll=
er SHOULD ensure that the IGP and TE metrics for these resources is higher t=
han the metrics for the underlay network resources allocated to non-enhanced=
 VPNs.=E2=80=9D
Considering these resources will span across the network and be changed upon=
 the slicing requirements , will such arrangement make the metric allocation=
 within the network a mess?
If the above statement can=E2=80=99t be met, how you ensure the traffic that=
 pass the P router use the dedicated resource(for example, bandwidth)?

Aijun Wang
China Telecom

> On Mar 26, 2020, at 23:31, John E Drake  wrote:
>=20
> =EF=BB=BFHi,
>=20
> As Joel notes, it is true that enhanced VPNs require the use of specific u=
nderlay network resources, either dedicated or shared, but the this needs to=
 be done without installing overlay VPN awareness in the P routers, which is=
 inherently unscalable and operationally complex.  Also, since VPNs span mul=
tiple ASes, putting overlay VPN state in an IGP doesn't work.=20
>=20
> Please see:  https://tools.ietf.org/html/draft-drake-bess-enhanced-vpn-02
>=20
> Yours Irrespectively,
>=20
> John
>=20
>=20
> Juniper Business Use Only
>=20
>> -----Original Message-----
>> From: Lsr  On Behalf Of Joel M. Halpern
>> Sent: Thursday, March 26, 2020 9:36 AM
>> To: xiechf@chinatelecom.cn; lsr 
>> Subject: Re: [Lsr] Using IS-IS Multi-Topology (MT) for Segment Routing ba=
sed
>> Virtual Transport Network
>>=20
>> [External Email. Be cautious of content]
>>=20
>>=20
>> In once sense, the statement is inherently true.  A VPN technology withou=
t
>> underlay support would seem to have significant difficulty in consistentl=
y
>> meeting an SLA.  Having said that much, the rest does not seem to follow.=

>>=20
>> Yours,
>> Joel

--Apple-Mail-38F6765B-EA0C-4E0B-99D2-7E978F928263
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Hi, John:
In your proposal, there is th=
e following text =E2=80=9C the network controller SHOULD ensure that the IGP <=
/span>and TE=
 metrics for these resources is higher than the metrics for the =
underlay net=
work resources allocated to non-enhanced VPNs.=E2=80=9D
Considering the=
se resources will span across the network and be changed upon the slicing re=
quirements , will such arrangement make the metric allocation within the net=
work a mess?
If the above statement can=E2=80=99t be met, how you ensur=
e the traffic that pass the P router use the dedicated resource(for example,=
 bandwidth)?

Aijun Wang
China Telecom

On Mar 26, 2020, at 2=
3:31, John E Drake <jdrake=3D40juniper.net@dmarc.ietf.org> wrote:
<=
br>
=EF=BB=BFHi,

As Joel notes, it is true that enha=
nced VPNs require the use of specific underlay network resources, either ded=
icated or shared, but the this needs to be done without installing overlay V=
PN awareness in the P routers, which is inherently unscalable and operationa=
lly complex.  Also, since VPNs span multiple ASes, putting overlay VPN s=
tate in an IGP doesn't work. 

Please see: &=
nbsp;https://tools.ietf.org/html/draft-drake-bess-enhanced-vpn-02
=

Yours Irrespectively,

John


Juniper Business Us=
e Only

-----Origi=
nal Message-----
From:=
 Lsr <lsr-bounces@ietf.org> On Behalf Of Joel M. Halpern
Sent: Thursday, March 26, 2020 9:3=
6 AM
To: xiechf@china=
telecom.cn; lsr <lsr@ietf.org>
Subject: Re: [Lsr] Using IS-IS Multi-Topology (MT) for Segme=
nt Routing based
Virt=
ual Transport Network

[External Email. Be=
 cautious of content]


In once sense, the statement is inheren=
tly true.  A VPN technology without
underlay support would seem to have significant difficult=
y in consistently
mee=
ting an SLA.  Having said that much, the rest does not seem to follow.<=
/span>

Yours,
Joel
<=
span>
=

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From: "Dongjie (Jimmy)" 
To: Peter Psenak , "xiechf@chinatelecom.cn" , lsr 
Thread-Topic: [Lsr] Using IS-IS Multi-Topology (MT) for Segment Routing based Virtual Transport Network
Thread-Index: AQHWAqvSFKMpwDI8rUWuLFe8Z6VJlqhY0lSAgAGZ5lD//6i2gIAAj2gQ//+MZgCAAcgWAA==
Date: Fri, 27 Mar 2020 06:56:40 +0000
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References: <2020032521444882209619@chinatelecom.cn> <950e7309-f077-2162-5150-db88913eb3a6@cisco.com> <9f173e8b3c374863ba1054a9c22585a7@huawei.com> <3d9953c8-46c6-21a4-6ba5-2688c5615bdb@cisco.com> <8bb4e17d014b41f1a394b3e555d26824@huawei.com> 
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From: "Dongjie (Jimmy)" 
To: "Les Ginsberg (ginsberg)" , Peter Psenak , "xiechf@chinatelecom.cn" , lsr 
Thread-Topic: [Lsr] Using IS-IS Multi-Topology (MT) for Segment Routing based Virtual Transport Network
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Subject: Re: [Lsr] Using IS-IS Multi-Topology (MT) for Segment Routing based Virtual Transport Network
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To: "Dongjie (Jimmy)" , "xiechf@chinatelecom.cn" , lsr 
References: <2020032521444882209619@chinatelecom.cn> <950e7309-f077-2162-5150-db88913eb3a6@cisco.com> <9f173e8b3c374863ba1054a9c22585a7@huawei.com> <3d9953c8-46c6-21a4-6ba5-2688c5615bdb@cisco.com> <8bb4e17d014b41f1a394b3e555d26824@huawei.com>  <8a955df2ecbb4380b28421335e7dfa63@huawei.com>
From: Peter Psenak 
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Date: Fri, 27 Mar 2020 09:11:15 +0100
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Subject: Re: [Lsr] Using IS-IS Multi-Topology (MT) for Segment Routing based Virtual Transport Network
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Hi Dongjie,

On 27/03/2020 07:56, Dongjie (Jimmy) wrote:
> Hi Peter,
> 
> You missed some of my comments in previous mail, could you also reply to this?
> 
>> Although the IANA registry shows that all the TE attributes could be used in TLV 222/223, this was not specified in RFC 5120 (or other RFCs I'm aware of), could you help to provide the reference to such IANA specification? In addition, it seems not all of the TE attributes are suitable to be carried at per-topology level. Thus the IANA registry may need to be updated.

my reading of RFC 5120 and the existing IANA registry is that it is 
legal to advertise TE attributes in MT TLVs:

https://www.iana.org/assignments/isis-tlv-codepoints/isis-tlv-codepoints.xhtml#isis-tlv-codepoints-22-23-25-141-222-223

It says "y" for all TE attributes. What else do you need?

> 
> And please see further replies inline with [Jie]:
> 
> -----Original Message-----
> From: Peter Psenak [mailto:ppsenak@cisco.com]
> Sent: Thursday, March 26, 2020 7:03 PM
> To: Dongjie (Jimmy) ; xiechf@chinatelecom.cn; lsr 
> Subject: Re: [Lsr] Using IS-IS Multi-Topology (MT) for Segment Routing based Virtual Transport Network
> 
> Hi Dongjie,
> 
> On 26/03/2020 11:57, Dongjie (Jimmy) wrote:
>> Hi Peter,
>>
>> Thanks for your comments.
>>
>>> -----Original Message-----
>>> From: Peter Psenak [mailto:ppsenak@cisco.com]
>>> Sent: Thursday, March 26, 2020 5:23 PM
>>> To: Dongjie (Jimmy) ; xiechf@chinatelecom.cn;
>>> lsr 
>>> Subject: Re: [Lsr] Using IS-IS Multi-Topology (MT) for Segment
>>> Routing based Virtual Transport Network
>>>
>>> Hi Dongjie,
>>>
>>> On 26/03/2020 07:40, Dongjie (Jimmy) wrote:
>>>> Hi Peter,
>>>>
>>>> As described in the abstract, the purpose of this draft is to define
>>>> a simplified
>>> control plane mechanism to build SR based Virtual Transport Network
>>> (VTN), it is based on the combination of IS-IS Multi-Topology with
>>> other IS-IS extensions, e.g. the extensions for TE, SR and L2 bundle.
>>> In a word, it tries to reuse the existing TLVs as much as possible.
>>>
>>> reusing the TLVs is not something that needs a standardization.
>>>
>>>>
>>>> That said, this document introduces the mechanism of specifying
>>> per-topology TE attributes, which was not covered in the existing
>>> IS-IS MT (RFC 5120).
>>>
>>> I can clearly see that TLVs defined in RFC5120 are listed in the
>>> registry of sub-TLVs available for TLV 222/223
>>>
>>> https://www.iana.org/assignments/isis-tlv-codepoints/isis-tlv-codepoi
>>> nts.xhtm
>>> l#isis-tlv-codepoints-22-23-25-141-222-223
>>>
>>> So I'm not sure what you are adding.
>>
>> In RFC 5120 section 7, it says that
>>
>> “If traffic engineering or some other applications are being applied per topology level later, the new TLVs can automatically inherit the same attributes already defined for the "standard" topology without going through long standard process to redefine them per topology.”
>>
>> This indicates that per-topology TE attributes is not a feature specified in RFC5120, although the TLVs can be reused.
> 
> the text above clearly says there is no standardization required.
> 
> [Jie] My reading of the above text is that RFC 5120 leaves the specification of per-topology TE or other applications to a later document. And it is also related to my below comment which you missed.

my reading is different.

> 
>> Although the IANA registry shows that all the TE attributes could be used in TLV 222/223, this was not specified in RFC 5120 (or other RFCs I'm aware of), could you help to provide the reference to such IANA specification? In addition, it seems not all of the TE attributes are suitable to be carried at per-topology level. Thus the IANA registry may need to be updated.
> 
> [Jie] Maybe you could provide some information about the history of this IANA registry? It assumes all the TE attributes can be applied to both TLV 22 and TLV 222, which may not always be the case.

registry clearly tells.

> 
>>>> Similarly, it also introduces the mechanism of associating MT-IDs
>>>> with a
>>> particular member link of L2 bundle, which was not defined in IS-IS
>>> L2 Bundle (RFC 8668).
>>>
>>> carrying MT-ID in the L2 Bundle TLV is conceptually wrong.
>>>
>>> It is the parent L3 link which has the association with the
>>> particular topology ID, you can not change the topology per L2 link member.
>>>
>>> You are trying to overload the MT-ID with the VTN semantics, but you
>>> can not do it here. If you need a VTN ID for the L2 member link,
>>> which I'm not sure why, you need to define a a new attribute and not mix it with MT-ID.
>>
>> In this document we try to reuse the existing IDs and TLVs to fulfil the functionality required. Since several existing TLVs defined for L3 link have been introduced for the L2 bundle member, we are considering the possibility of also carrying MT-ID as another attribute of the member link. Could you elaborate why it cannot be reused? Of course defining a new VTN-ID is another option. We are open to discussion about this.
> 
> the reason is simple - the L3 link is already associated with the MT-ID.
> You can not change the MT-ID of the underlying L2 link.
> 
> [Jie] In this case, the L3 link is associated with the union of the MT-IDs associated with its L2 member links.
> 
> For example, if a L3 link has three L2 member links, which are associated with MT-x, MT-y and MT-z respectively, then the L3 link is associated with MT-x, MT-y and MT-z.

I'm going to repeat myself here. You are misusing the MT-ID for 
something you have defined. I don't think it is correct. L2  bundle link 
is NOT a topological entity in ISIS, only the L3 link is. Associating L2 
bundle link with a MT is conceptually wrong.

If you wanted different bundle members to be part of different 
topologies the obvious solution would be to enable L3 directly on the 
individual links rather than combine them into one L3 Bundle interface.

thanks,
Peter


> 
> Best regards,
> Jie
> 
> 
> thanks,
> Peter
> 
>>
>> Best regards,
>> Jie
>>
>>>
>>> thanks,
>>> Peter
>>>
>>>
>>>>
>>>> Thus we think it is appropriate to be standard track.
>>>>
>>>> Best regards,
>>>> Jie
>>>>
>>>>> -----Original Message-----
>>>>> From: Lsr [mailto:lsr-bounces@ietf.org] On Behalf Of Peter Psenak
>>>>> Sent: Wednesday, March 25, 2020 10:09 PM
>>>>> To: xiechf@chinatelecom.cn; lsr 
>>>>> Subject: Re: [Lsr] Using IS-IS Multi-Topology (MT) for Segment
>>>>> Routing based Virtual Transport Network
>>>>>
>>>>> Hi Chongfeng,
>>>>>
>>>>> what exactly is being standardized in this draft? I don't see anything.
>>>>>
>>>>> thanks,
>>>>> Peter
>>>>>
>>>>>
>>>>> On 25/03/2020 14:44, xiechf@chinatelecom.cn wrote:
>>>>>>
>>>>>> Hello, folks,
>>>>>>
>>>>>> we have submitted a new draft of
>>>>>>      https://tools.ietf.org/html/draft-xie-lsr-isis-sr-vtn-mt-00 .
>>>>>>
>>>>>> It is about Using IS-IS Multi-Topology (MT) for Segment Routing
>>>>>> based Virtual Transport Network. Enhanced VPN (VPN+) as defined in
>>>>>> I-D.ietf-teas-enhanced-vpn aims to provide enhanced VPN service to
>>>>>> support some applications's needs of enhanced isolation and
>>>>>> stringent performance requirements.  VPN+ requries integration
>>>>>> between the overlay VPN and the underlay network.  A Virtual
>>>>>> Transport Network
>>>>>> (VTN) is a virtual network which consists of a subset of the
>>>>>> network toplogy and network resources allocated from the underlay network.
>>>>>> A VTN could be used as the underlay for one or a group of VPN+ services.
>>>>>> This document describes a simplified mechanism to build the SR
>>>>>> based VTNs using IGP
>>>>>> multi- topology together with other well-defined IS-IS extensions.
>>>>>>
>>>>>> Comments and suggestions are highly appreciated.
>>>>>>
>>>>>> Chongfeng Xie
>>>>>>
>>>>>>
>>>>>
>>>>> _______________________________________________
>>>>> Lsr mailing list
>>>>> Lsr@ietf.org
>>>>> https://www.ietf.org/mailman/listinfo/lsr
>>>>
>>>>
>>
>>
>>
> 
> 
> 


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