Thank you for your liaison to CCAMP on GMPLS Calls from your Stuttgart
interim meeting in September 2007.
In your liaison, you noted that the GMPLS call is assumed to be as
general as possible, and you asked what other call applications there
may be in addition to ASON and the CCAMP VCAT draft. At this moment,
there are four applications on which the CCAMP working group is working
where GMPLS calls are applied. The first two are ASON and VCAT as you
note. The third is related to ASON and is the multi-layer network. The
fourth provides support for the MEF UNI in coordination with the OIF.
Other topics in the future might include OAM coordination, billing, and
client-facing port capability negotiation.
Your observations about how TNA information is not used in the
propagation or delivery of the [call] message, but may be used [by call
controllers] to identify the destination UNI and hence [the
destination] Network Call Controller agrees with our understanding and
intentions. In practice, a large range of information may be used by
call controllers to route calls - that is, to select a series of call
controllers between call source and call destination - although we
would not wish to preclude source-routing of calls. It is our intention
that the generic call message should be capable of being extended to
carry any information required by any application of the call message.
In this light you ask for guidance on how to carry ASON call
information across a GMPLS network so that it can be reconstructed at
ASON call boundaries, and say that you support the resumption of work
on a CCAMP I-D on ASON applicability to address the above and would
welcome the opportunity to contribute through liaisons. We welcome your
support and look forward to working with you in this context. As above,
we note that the GMPLS call message (the Notify message) is not limited
to the exchange of information between call end points, but can also
exchange information between transit call controllers by forming call
segments as described in section 7.3.1 of RFC 4974. Work on carrying
ASON call information within a GMPLS call message falls within the
CCAMP charter and we hope that interested parties will bring ideas
forward through the normal process which is, of course,
contribution-driven. We would welcome input from all sources either
through the CCAMP mailing list or through liaisons.
Adrian Farrel and Deborah Brungard
CCAMP working group co-chairs