Re: [Lsr] draft-draft-peng-lsr-algorithm-related-adjacency-sid
Peter Psenak <ppsenak@cisco.com> Thu, 11 March 2021 09:56 UTC
Return-Path: <ppsenak@cisco.com>
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 21F693A1785 for <lsr@ietfa.amsl.com>; Thu, 11 Mar 2021 01:56:32 -0800 (PST)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -9.602
X-Spam-Level:
X-Spam-Status: No, score=-9.602 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, NICE_REPLY_A=-0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001, USER_IN_DEF_DKIM_WL=-7.5] autolearn=ham autolearn_force=no
Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=cisco.com
Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id BYlfkifRKz6l for <lsr@ietfa.amsl.com>; Thu, 11 Mar 2021 01:56:30 -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 D7F413A1782 for <lsr@ietf.org>; Thu, 11 Mar 2021 01:56:29 -0800 (PST)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=cisco.com; i=@cisco.com; l=1370; q=dns/txt; s=iport; t=1615456590; x=1616666190; h=subject:to:cc:references:from:message-id:date: mime-version:in-reply-to:content-transfer-encoding; bh=ZZcK+ETxLI+jC6rxz4HVRNcGfxtdekNx+jWYk4dnCW8=; b=kF5swh+WGQTEpmwXqrjUG1nyQOT+w2bhG6KCzwXjB6Sr+WSmlfNOpRBz /vQqol+2463KbtsvY3JrmH61JpIw75DnfGFf9XTV64BJAIOkfbn+69L0L mBFfyfco87/EWTzIh+cz7rswP1xG5kj50FubvhrjN85oieqkGsGIaZEeG s=;
X-IPAS-Result: A0APAQDp6ElglxbLJq1aGwEBAQEBAQEBBQEBARIBAQEDAwEBAUCBTwKDdQEnEjGEQYkEiBMIJQOcRQsBAQEPNAQBAYRNAoF0JjkFDQIDAQEBAwIDAQEBAQUBAQECAQYEFAEBAQEBAQEBhkOGRQEFIw8BBS8SEAsYAgImAgJXBwwGAgEBgmyDCKwUdoEyhViDP4FFgQ8qAYlQg3JCgUlCgRABJwyCaD6Dd4Ncgl8EgkBEJgSBIytZMJEtqBKBFIMKgzCYcQUHAx+TZ5AZlGuibYFsIIFZMxoIGxU7gmlQGQ2OKw0JjidAAy84AgYBCQEBAwmMfwEB
IronPort-HdrOrdr: A9a23:dAqeaqHpt1KORBL+pLqFoZHXdLJzesId70hD6mlaQ3VuHvCwvc aogfgdyFvQgDEeRHkvlbm7Sc69aFnb8oN45pRUAKyrWxPotHDtAIZp64bjxDOIIVyZysd206 B8f69iTODhFFQSt7ef3CCUG8stqePmzImGnuHbpk0CcShLbOVa4x59GkKnFCRNNWx7LL4YML bZ2cZdvTqnfh0sH6aGL10IRfLKqdGOtL+OW387LiUq4gWPkj+kgYSSe3Ol9ywTXD9VzbAp/X KtqWPEz5++uPK2wAK07QXuxqlR8eGN9vJ+HsCWzuAaJjLw4zzYB7hJavmloC0/pv2p5RIMlt TByi1QR/hb2jf2Yny/pwfr1k3b9AsWr1XmyVOenBLY0LXEeA4=
X-IronPort-Anti-Spam-Filtered: true
X-IronPort-AV: E=Sophos;i="5.81,240,1610409600"; d="scan'208";a="34039996"
Received: from aer-iport-nat.cisco.com (HELO aer-core-1.cisco.com) ([173.38.203.22]) by aer-iport-4.cisco.com with ESMTP/TLS/DHE-RSA-SEED-SHA; 11 Mar 2021 09:56:25 +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 12B9uPcA011623; Thu, 11 Mar 2021 09:56:25 GMT
To: chen.ran@zte.com.cn, tonysietf@gmail.com
Cc: lsr@ietf.org
References: <202103111651528716447@zte.com.cn>
From: Peter Psenak <ppsenak@cisco.com>
Message-ID: <ec489872-0621-835b-cb20-63b914819d59@cisco.com>
Date: Thu, 11 Mar 2021 10:56:24 +0100
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:60.0) Gecko/20100101 Thunderbird/60.9.1
MIME-Version: 1.0
In-Reply-To: <202103111651528716447@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: <https://mailarchive.ietf.org/arch/msg/lsr/6sQIZnbfK04aLeaxOeWSdPceOC8>
Subject: Re: [Lsr] draft-draft-peng-lsr-algorithm-related-adjacency-sid
X-BeenThere: lsr@ietf.org
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: Link State Routing Working Group <lsr.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/lsr>, <mailto:lsr-request@ietf.org?subject=unsubscribe>
List-Archive: <https://mailarchive.ietf.org/arch/browse/lsr/>
List-Post: <mailto:lsr@ietf.org>
List-Help: <mailto:lsr-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/lsr>, <mailto:lsr-request@ietf.org?subject=subscribe>
X-List-Received-Date: Thu, 11 Mar 2021 09:56:32 -0000
Hi Ran, Tony, I believe the primary use case for algorithm specific adj-SID is for the protected Adj-SID. The backup path of such Adj-SID follows the algo specific constraints. thanks, Peter On 11/03/2021 09:51, chen.ran@zte.com.cn wrote: > Hi Tony, > > Thanks for your comments. The reason why this draft is proposed is that: > > Currently, the current FA draft only defines that the algorithm > identifier is included as part of a Prefix-SID advertisement,that maybe > not satisfy some scenarios where multiple algorithm share the same link > resource. > > For example, an SR-TE policy may be instantiated within specific > Flex-algo plane, i.e.,the SID list requires to include algorithm related > SIDs. An algorithm-unware Adjacency-SID included in the SID list can > just steer the packet towards the link, but can not apply different QoS > policy for different algorithm. > > Another example is that the TI-LFA backup path computed in > Flex-algo plane may also contain an algorithm-unware Adjacency-SID, > which maybe also used in other SR-TE instance that carries other service. > > This document complement that the algorithm identifier can be also > included as part of an Adjacency-SID advertisement for SR-MPLS. > > > Best Regards, > > Ran > >