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

Huub van Helvoort <huubatwork@gmail.com> Sat, 09 August 2014 11:40 UTC

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Date: Sat, 09 Aug 2014 13:40:40 +0200
From: Huub van Helvoort <huubatwork@gmail.com>
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To: Yimin Shen <yshen@juniper.net>
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Subject: Re: [PWE3] [mpls] WG Last Call for draft-ietf-pwe3-endpoint-fast-protection-01 - RFC4447
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Hello Yimin,

You wrote:

 > It will not be a problem if this mechanism and an e2e mechanism
 > are both implemented in a network. As described in the draft,
 > this mechanism provides local repair, and it is viewed as a
 > temporary repair. The draft strongly recommend this mechanism
 > to be used in tandem with an e2e or global repair mechanism,
 > so that the later can eventually move traffic from the locally
 > repaired PW over to a fully functional PW, as a permanent repair.

How do you warrant that all the repair mechanisms present do
not decide to switch at the same time?
This would result in unpredictable repairs.
So some coordination between the repair mechanisms is required.

regards, Huub.


> -----Original Message-----
> From: pwe3 [mailto:pwe3-bounces@ietf.org] On Behalf Of Loa Andersson
> Sent: Friday, August 08, 2014 5:31 AM
> To: Mingui Zhang; Stewart Bryant (stbryant)
> Cc: mpls@ietf.org; Eric Rosen (erosen); pwe3; pwe3-chairs@tools.ietf.org
> Subject: Re: [PWE3] [mpls] WG Last Call for draft-ietf-pwe3-endpoint-fast-protection-01 - RFC4447
>
> 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?
> If we have implementations of both, do we have any real measurements?
>
> /Loa
>


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