Multi-area TE requirements and crankback routing

[Atsushi Iwata <iwata@ccm.CL.nec.co.jp>]

Hi, Rob, Kireeti, and CCAMP folks,

Thank you for having a nice discussion in the CCAMP WG today.
I made a presentation of the crankback routing extension for MPLS signaling 
in the CCAMP WG (draft-iwata-mpls-crankback-00.txt). 

I got a question from Rob. He mentioned that crankback routing would not be 
needed in a flat network but might be needed in a hierarchical network 
(i.e. in multi-area TE scenario). He also suggested me that we need a 
requirement draft of multi-area TE from TE WG before making our draft a WG draft.

Actually, I forgot to tell you one thing. A following draft discussing 
multi-area TE requirements will be presented by Jerry Ash in TE-WG on this 
Thursday.

G. Ash et al., "Requirements for Multi-Area TE", 
draft-ash-ccamp-multi-area-te-reqmts-00.txt, Feb.2001

This requirement draft categorizes several multi-area TE methods, all of 
which use crankback routing procedures for improving the LSP blocking 
probability. The improving the LSP blocking probability is an important 
factor in terms of network performance for the carrier perspective.

I think that we already have a good requirement draft in TE WG. Please 
attend the TE WG meeting on this Thursday, and discuss the crankback 
routing requirements as well.

Thank you.

----------------------------------------------------------------
Atsushi Iwata
Assistant Manager
Network Architecture TG,
Computer & Communication Media Research Labs, NEC Corporation
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