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Re: I-D ACTION:draft-ietf-ccamp-lsp-stitching-01.txt

Hi Jean-Louis,

Thanks for the useful comments. We plan to submit a new revision (including answer to Adrian's comments also) right after this IETF.

Cheers

JP.

On Jul 28, 2005, at 10:00 AM, LE ROUX Jean-Louis RD-CORE-LAN wrote:

Hi Arthi, JP

Thanks for this new revision that sounds really good

I have two commments:

-In section 4.1.2 you partially describe bidirectional LSP stitching procedure.
You mention that an Upstream Label MUST NOT be allocated by the end- to-end LSP on the LSP segment, which is OK.
But then how the LSP-Segment Egress will now that the end-to-end LSP is bidirectional? What about defining a flag in the Attributes Flags TLV of the LSP_ATTRIBUTE object so as to indicate that the LSP is bidirectional?
Also the selection of the LSP segment in case of bidirectional LSP should be detailed (e.g. If the end-to-end LSP is bidirecitonal then
the LSP-segment MUST be bidirectional. Also shall we allow that two unidrectional end-to-end LSP use the same bidirectional LSP segment (one in each direction)?

-At the end of section 4.2.5 you mention that LSP-Segment failure or maintenance SHOULD be treated as a failure event for the end-to- end LSP. I agree for LSP-Segment failure but not for LSP-Segment maintenance. LSP-Segment maintenance should be treated as TE-link maintenance for the end-to-end LSP, and procedures defined in GMPLS graceful TE-link shutdown draft may be useful (Specific RSVP error code and TE-link attribute)...

Hope this helps,

Best Regards

JL



-----Message d'origine-----
De : owner-ccamp@ops.ietf.org
[mailto:owner-ccamp@ops.ietf.org] De la part de
Internet-Drafts@ietf.org
Envoyé : vendredi 15 juillet 2005 21:50
À : i-d-announce@ietf.org
Cc : ccamp@ops.ietf.org
Objet : I-D ACTION:draft-ietf-ccamp-lsp-stitching-01.txt

A New Internet-Draft is available from the on-line
Internet-Drafts directories.
This draft is a work item of the Common Control and
Measurement Plane Working Group of the IETF.

    Title        : Label Switched Path Stitching with
Generalized MPLS Traffic Engineering
    Author(s)    : A. Ayyangar, J. Vasseur
    Filename    : draft-ietf-ccamp-lsp-stitching-01.txt
    Pages        : 19
    Date        : 2005-7-15

In certain scenarios, there may be a need to combine together two
different Generalized Multi-Protocol Label Switching (GMPLS) Label
Switched Paths (LSPs) such that in the data plane, a single end- to-
end (e2e) LSP is achieved and all traffic from one LSP is switched
onto the other LSP. We will refer to this as "LSP
stitching". This
document covers cases where: a) the node performing the stitching
does not require configuration of every LSP pair to be stitched
together b) the node performing the stitching is not the egress of
any of the LSPs c) LSP stitching not only results in an end-to-end
LSP in the data plane, but there is also a corresponding end-to- end
LSP (RSVP session) in the control plane. It might be possible to
configure a GMPLS node to switch the traffic from an LSP
for which it
is the egress, to another LSP for which it is the ingress, without
requiring any signaling or routing extensions whatsoever,
completely
transparent to other nodes. This will also result in LSP stitching
in the data plane. However, this document does not cover this
scenario of LSP stitching.

A URL for this Internet-Draft is:
http://www.ietf.org/internet-drafts/draft-ietf-ccamp-lsp-stitc

hing-01.txt


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