Hi working group,
In recent months there has been a resurgence of interest in the inter-layer
characteristics of the ASON architecture defined in the ITU-T. This has
included discussions in Study Group 15 Questions 12 and 14 about how to
provide routing in a layered network.
As you may recall, Study Group 15 recently recognized PCE as an option for
handling their multi-level routing requirements , and published G.7715.2
describing how a separate path computation component could be used.
So we think that draft-ietf-pce-inter-layer-frwk-05.txt and
draft-ietf-pce-inter-layer-req-05.txt may be of interest to them and propose
to send the short liaison below.
Your comments are welcomed.
Regards,
Adrian and JP
===
To: ITU-T Q12/15 and Q14/15
Cc: Stephen Trowbridge, Kam Lam, Malcolm Betts, Ross Callon, Dave Ward,
Scott Bradner
Subject: Application of PCE to Inter-Layer Networks
For: Information
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
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