Liaison statement
Multi-Layer Networking (MLN) Work in CCAMP

State Posted
Submitted Date 2007-04-04
From Group ccamp
From Contact Adrian Farrel
To Group ITU-T-SG-15-Q14
To Contacts Greg Jones
CcStephen Trowbridge
Kam Lam
Ross Callon
Dave Ward
Scott Bradner
CCAMP Mailing List
Response Contact Adrian Farrel
Deborah Brungard
Technical Contact Adrian Farrel
Deborah Brungard
Purpose For action
Deadline 2007-05-18 Action Taken
Attachments (None)
The CCAMP working group notes your request to review its work on Multi-Layer
Networking (MLN) as indicated in your liaison "Liaison Statement to CCAMP
responding to ccamp liaison of 21 February 2007" dated March 2007.

We are nearing completion of our analysis of the requirements for MLN, and
our evaluation of existing protocols, so now is an appropriate time for you
review this material, and we would be grateful for your comments on or
before the deadline marked above.

The requirements work can be found at
The protocol evaluation is at

In your review of this material, it may be helpful to pay particular care to
understand the definition of MLN that is used. It may also be helpful to use
some of the terminology interpretation presented in RFC4397.

The CCAMP working group also anticipates working on protocol extensions to
fill the lacunae identified by the protocol evaluation Internet-Draft. An
individual submission on this subject may be found at,
but the working group has yet to make a decision about whether to accept
this as the basis for the work.

We note that in a liaison dated February 2004 discussing the signaling
requirements for ASON and reviewing draft-ietf-ccamp-gmpls-ason-reqts-05.txt
you said:

    11. G.8080 defines the ASON control plane as applying to a
        single layer.  Some examples in the draft involve multiple
        layers.  While not precluded by implementations, a suggested
        replacement example is contained in the marked up copy that
        is single layer.

Could you please confirm your current view of the definition of the ASON
control plane in G.8080. Does the ASON control plane now apply to more than
one layer? Could you please provide references to the appropriate sections
of your Recommendations.

Best regards,
Adrian Farrel and Deborah Brungard
Co-chairs, IETF CCAMP Working Group