Re: [Pals] Mirja Kühlewind's No Objection on draft-ietf-pals-endpoint-fast-protection-04: (with COMMENT)
Yimin Shen <yshen@juniper.net> Fri, 16 December 2016 17:02 UTC
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From: Yimin Shen <yshen@juniper.net>
To: Mirja Kuehlewind <ietf@kuehlewind.net>, The IESG <iesg@ietf.org>
Thread-Topic: [Pals] Mirja Kühlewind's No Objection on draft-ietf-pals-endpoint-fast-protection-04: (with COMMENT)
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Date: Fri, 16 Dec 2016 17:02:52 +0000
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Cc: "draft-ietf-pals-endpoint-fast-protection@ietf.org" <draft-ietf-pals-endpoint-fast-protection@ietf.org>, "stewart.bryant@gmail.com" <stewart.bryant@gmail.com>, "pals-chairs@ietf.org" <pals-chairs@ietf.org>, "pals@ietf.org" <pals@ietf.org>
Subject: Re: [Pals] Mirja Kühlewind's No Objection on draft-ietf-pals-endpoint-fast-protection-04: (with COMMENT)
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Hi Mirja, Thanks very much for your review and comments! Please see my answers inline. Thanks, -- Yimin On 12/14/16, 8:32 AM, "Pals on behalf of Mirja Kuehlewind" <pals-bounces@ietf.org on behalf of ietf@kuehlewind.net> wrote: Mirja Kühlewind has entered the following ballot position for draft-ietf-pals-endpoint-fast-protection-04: No Objection ---------------------------------------------------------------------- COMMENT: ---------------------------------------------------------------------- A few smallish comments/questions: 1) This is no news but there are a lot of acronyms in this drafts which makes it partly hard to read. Some of them are never spelled out, such as PE, CE, RSVP... I would like to propose two changes to support the reader: 1) Spell out all acronyms in the abstract and 2) add a glossary. Further you could maybe also define some terminology at the beginning such as 'protector'. [yshen] I will do 1) as you suggested, and also scan the document and spell out acronyms that are missed out. 2) This sentence/use of acronym is confusing: "In Figure 1, the IP/MPLS network consists of PE and P routers." NEW: "In Figure 1, the IP/MPLS network consists of four PEs and two routers P1 and P2." [yshen] Will make this change. 3) I don't fully understand this part in sec 4.1: "Normally the router will attempt to forward PW packets in a load balance fashion over the ECMP set. When the link fails, if the router reroutes only the portion of traffic originally traversing the link while letting the rest of traffic remain on the other ECMP branches, it will create a situation where the egress CE receives traffic from both the primary PE and the backup PE. " If you have two ECMP branches, why don't you simply use the other one for all traffic? Isn't this the kind of protection your are discussing? Or are you assuming that this note somewhere on the PW does not apply this backup strategy? [yshen] ECMP branches can only be used to protected each other (in the manner you mentioned), if the failure on one branch is not shared by other branches. This condition may hold in some cases of transit link/node failure, but not in an egress node failure. At the moment that we detect an egress node failure on any ECMP branch, we should know this failure is going to affect all ECMP branches (i.e. the entire tunnel). Therefore, despite the current state of the other branches (as some of them may not be direct links to the egress node, and hence subject to delay in failure detection or propagation), we should move all traffic to the bypass LSP. I will revise the text to clarify this. 4) Do you have references for mechanisms described in section 5? [yshen] In general, a network has a numbers of options to react to a failure (while local repair is in use) and eventually converge. We have seen all them being used in real networks. In this section, we list them for the completeness of the document, to provide to overview on what to expect after egress protection kicks in. Section 6.5.2 of RFC 4090 has a similar discussion in the context of RSVP, but I don’t think this document should refer to that, because all these mechanisms are protocol independent and common practices. One high level comment: I was wondering while reading the whole time if this should be informational or standards track. Was there any discussion in the wg? Are there implementations? [yshen] Yes, there have been implementations and deployments. _______________________________________________ Pals mailing list Pals@ietf.org https://www.ietf.org/mailman/listinfo/pals
- [Pals] Mirja Kühlewind's No Objection on draft-ie… Mirja Kuehlewind
- Re: [Pals] Mirja Kühlewind's No Objection on draf… Yimin Shen