Lots of thanks for a prompt response.
My original email contained a typo (S-PE instead of T-PE named as inserting )
which I've acknowledged and corrected in this thread (please see
With this correction in mind, the example I've presented (an MS-PW that
originates in a T-PE in a MPLS-TP domain and them crosses - at S-PE - into an
IP/MPLS domain) matches, IMHO, Yaakov's question. And if the operator wishes to
improve traffic distribution in the IP/MPLS domain which employs ECMP, flow
labels would be inserted by T-PE.
I believe that the change in draft-ietf-pwe3-gal-in-pw that you've proposed in
http://www.ietf.org/mail-archive/web/pwe3/current/msg12613.html resolves the
original issue I've raised of both GAL and flow label "competing" for the BoS
However, a conceptual question - can any MPLS-TP restrictions be placed on
PWs?- remains open as noted in Greg's comment (please see
http://www.ietf.org/mail-archive/web/pwe3/current/msg12620.html). IMHO and FWIW
we should acknowledge the fact (implicitly recognized already in RFC 5920)
that there is simply no such thing as a MPLS-TP PW.
Hopefully this note clarifies my position on the subject.
Regards, and apologies for the original typo,
From: Stewart Bryant [stbryant(_at_)cisco(_dot_)com]
Sent: Thursday, September 01, 2011 8:33 PM
To: Alexander Vainshtein
Cc: Yaakov Stein; mpls(_at_)ietf(_dot_)org; pwe3; iesg(_at_)ietf(_dot_)org;
pwe3-chairs(_at_)tools(_dot_)ietf(_dot_)org; Luca Martini; IETF Discussion
Subject: Re: [mpls] [PWE3] IETF Last Call comment on draft-ietf-pwe3-gal-in-pw
On 01/09/2011 17:07, Alexander Vainshtein wrote:
PW that starts in an MPLS-TP domain, can easily leak into a non-TP domain
This is exactly the point that I've raised in my IETF LC comment on the draft
(for MS-PW) - please see my email (to several lists) that explains that in some
detail, at http://www.ietf.org/mail-archive/web/pwe3/current/msg12581.html.
The operator intends to improve traffic distribution in the IP/MPLS domain,
hence he enables insertion and discard of "flow labels" at the two S-PEs.
Speaking as an author of the FAT-PW draft I do not recall any text that
proposes that S-PEs insert FLs in the stack, and it never occurred to me that
anyone anyone would try, since would require a change to the design of the
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