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Re: [PWE3] [mpls] WG Last Call for draft-ietf-pwe3-endpoint-fast-protection-01 - RFC4447

Yakov Rekhter <yakov@juniper.net> Fri, 08 August 2014 14:02 UTC

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Date: Fri, 08 Aug 2014 07:02:46 -0700
From: Yakov Rekhter <yakov@juniper.net>
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Cc: "mpls@ietf.org" <mpls@ietf.org>, "pwe3-chairs@tools.ietf.org" <pwe3-chairs@tools.ietf.org>, pwe3 <pwe3@ietf.org>, "Eric Rosen (erosen)" <erosen@cisco.com>, "Stewart Bryant (stbryant)" <stbryant@cisco.com>
Subject: Re: [PWE3] [mpls] WG Last Call for draft-ietf-pwe3-endpoint-fast-protection-01 - RFC4447
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Loa,

> Authors, Mingui, Stewart
> 
> On 2014-08-08 04:46, Mingui Zhang wrote:
> > Hi Stewart,
> >
> > I think authors would say the S-PE stitching method involves 
> > the control plane processing during the repair procedure. They 
> > emphasized their method uses data plane & local repair, which 
> > can be faster.
> > Here, I want to raise one issue:
> 
> It seems that we take it for granted that the method proposed on this
> draft is faster than e.g. the e2e protection a la mpls-tp. Why is that?

To answer your question let me quote from "Network Recovery" by JP
Vasseur, Mario Pickavet, Piet Demeester (Section 5.8.1, page 336):

  With global protection, rerouting is performed by the head-end
  LSR, which means that this requires for the head-end LSR to receive
  the failure indication to reroute the affected traffic onto their
  respective backup paths (whose paths have been precomputed and
  signaled). So in terms of recovery time, the delta between global
  and local protection is the failure indication signal propagation
  time to the head-end LSR.

Yakov.

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