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Re: I-D ACTION:draft-ietf-ccamp-lsp-stitching-02.txt
Hi.
I'd like to recognize the good effort by the authors to bring the document
into its current shape.
I have a few minor comments.
1. forwarding adjacency.
The term is used in a sense of a data plane adjacency between two nodes
that could be used to send data directly to each other, which literally
means "forwarding adjacency" :=). Unfortunately the term is widely used in a
different sense - as a certain control plane quality of a TE link. I'd
recommend to use term "data plane adjacency" instead of "forwarding
adjacency" in this document.
2. regular, basic TE link
These terms are not clear and not defined anywhere. I'd suggest to use term
" TE link associated with statically configured data link(s)"
3.
"
E.g. one suggested usage in case of P2MP RSVP
LSPs ([7]) is the use of LSP stitching to stitch a P2MP RSVP LSP to
an LSP segment between P2MP capable LSRs in the network. The LSP
segment would traverse legacy LSRs that may be incapable of acting as
P2MP branch points, thereby shielding them from the P2MP control and
data path.This statement is not quite accurate. Stitching segments as
well as H-LSPs help to use legacy non-P2MP capable (not branch incapable)
nodes as intermediate nodes of P2MP tunnels. This is not about branching
capability that legacy LSRs lack - this is about P2MP signaling capability.
Igor
----- Original Message -----
From: <Internet-Drafts@ietf.org>
To: <i-d-announce@ietf.org>
Cc: <ccamp@ops.ietf.org>
Sent: Friday, September 23, 2005 3:50 PM
Subject: I-D ACTION:draft-ietf-ccamp-lsp-stitching-02.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-02.txt
> Pages : 19
> Date : 2005-9-23
>
> In certain scenarios, there may be a need to combine together
> 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 realized 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 may 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:
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