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Re: [mpls] RtgDir review: draft-ietf-mpls-tp-rosetta-stone-12.txt

John E Drake <jdrake@juniper.net> Mon, 14 October 2013 14:48 UTC

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From: John E Drake <jdrake@juniper.net>
To: "Bhatia, Manav (Manav)" <manav.bhatia@alcatel-lucent.com>, Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>
Thread-Topic: RtgDir review: draft-ietf-mpls-tp-rosetta-stone-12.txt
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Date: Mon, 14 Oct 2013 14:48:32 +0000
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Subject: Re: [mpls] RtgDir review: draft-ietf-mpls-tp-rosetta-stone-12.txt
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Manav,

Snipped, comment inline.

Yours Irrespectively,

John

> -----Original Message-----
> From: rtg-dir-bounces@ietf.org [mailto:rtg-dir-bounces@ietf.org] On Behalf Of
> Bhatia, Manav (Manav)
> Sent: Sunday, October 13, 2013 10:26 PM
> To: Alexander Vainshtein
> Cc: rtg-dir@ietf.org; rtg-ads@tools.ietf.org; draft-ietf-mpls-tp-rosetta-
> stone.all@tools.ietf.org; mpls@ietf.org
> Subject: Re: [RTG-DIR] RtgDir review: draft-ietf-mpls-tp-rosetta-stone-12.txt
> 
> Sasha,
> 
> I think the confusion is over what we mean by "fate sharing".
> 
> To me, if the forward path is torn down for some reason, and that results in
> the backward path being torn down as well, then they inextricably "share the
> fate".
> 
> If the path of the forward LSP changes because of an IGP trigger, then the
> backward LSP changes too in case of co-routed bidirectional LSPs. However,
> this isn't true in case of Associated bidirectional LSPs. Similarly, an IGP change
> (or a network event -- link/node flap, link/node down) will always result in both
> directions changing their path in case of co-routed bidirectional LSPs. This
> doesn't happen in case of Associated bidirectional LSPs.

[JD]  You attributing to the endpoints of a pair of Associated LSPs a behavior which
I think is actually at their discretion. 

> Its this difference that
> I wanted the authors to highlight as part of my review comment.
> 
> If you think "fate sharing" is not the most appropriate term then you can
> suggest something else as long as you believe its something that ought to be
> mentioned.
> 
> Cheers, Manav
>

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