Liaison statement
Application of PCE to Inter-Layer Networks

State Posted
Submitted Date 2007-11-20
From Group pce
From Contact Adrian Farrel
To Groups ITU-T-SG-15-Q12, ITU-T-SG-15-Q14
To Contacts Greg Jones
CcStephen 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)
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
This document should be read in the context of the general PCE architecture
described in "A Path Computation Element (PCE)-Based Architecture"

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

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 "

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