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Liaison Statement: Application of PCE to Inter-Layer Networks

Submission Date: 2007-11-20
From: IETF PCE WG (Adrian Farrel)
To: ITU-T Q12/15 and Q14/15 (Greg Jones)
Cc:Stephen Trowbridge
Kam Lam
Malcolm Betts
Ross Callon
Dave Ward
Scott Bradner
PCE Working Group
Response Contact: Adrian Farrel
JP Vasseur
Technical Contact: Adrian Farrel
JP Vasseur
Purpose: For information
Attachments: (none)
Body:
The Path Computation Element (PCE) working group of the IETF is aware
that 
your Questions have recently been discussing the inter-layer aspects of
the 
ASON architecture and particularly how to select routes across a
multi-layer 
network, and how to represent within a higher layer network the
potential or 
real connectivity across a lower layer network.

In the light of G.7715.2 we believe that you may be interested in some
work 
being discussed in the PCE working group. "Framework for PCE-Based 
Inter-Layer MPLS and GMPLS Traffic Engineering" may be found at 
http://www.ietf.org/internet-drafts/draft-ietf-pce-inter-layer-frwk-05.txt.

This document should be read in the context of the general PCE
architecture 
described in "A Path Computation Element (PCE)-Based Architecture" 
http://www.ietf.org/rfc/rfc4655.txt

Although not specifically targeted at the ASON architecture, we would 
welcome any comments that you have on 
draft-ietf-pce-inter-layer-frwk-05.txt, and invite interested parties
to 
contribute either through the liaison process or via the PCE working
group 
mailing list details of which can be found at the PCE working group
charter 
page http://www.ietf.org/html.charters/pce-charter.html

We are also looking at the requirements driven by inter-layer routing
for 
extensions to the PCE Protocol (PCEP) used for communication between
Path 
Computation Clients (PCCs) and PCEs. These can be found in "PCC-PCE 
Communication and PCE Discovery Requirements for Inter-Layer Traffic 
Engineering " 
http://www.ietf.org/internet-drafts/draft-ietf-pce-inter-layer-req-05.txt

Best regards,
JP Vasseur and Adrian Farrel
IETF PCE working group co-chairs