Question: purpose of LMP ChannelActive message (was relationship of RSVP-TE and LMP)

["George Young" <george.young@edgeflow.com>]

Didn't see any answers to this question, so I'll try to rephrase and
make it
more focused.

What is the purpose of the LMP ChannelActive message?

I'm assuming a call is set up through an optical cross connect (OXC),
either in
response to control plane signalling (e.g. RSVP-TE) or management plane
input.
The OXC has knowledge of which optical links are involved with the call
for
failure monitoring purposes.

What additional information would the receipt of a ChannelActive message
convey?

Regards,
George.
edgeflow Inc.
329 March Rd., Kanata, ON, Canada, K2K 2E1
phone: +1 613-270-9279 Ext 287
fax: +1 613-270-9268


>-----Original Message-----
>From: George Young 
>Sent: Friday, September 07, 2001 3:47 PM
>To: ccamp@ops.ietf.org
>Subject: relationship of RSVP-TE and LMP
>
>
>I have two questions about the relationship of RSVP-TE
>(draft-ietf-mpls-generalized-rsvp-te-03.txt) and LMP
>(draft-ietf-ccamp-lmp-00.txt).
>
>First of all, my understanding of the LMP ChannelActive message is that
>it is used to indicate to the downstream (relative to data flow
>direction) node that monitoring should be used.
>
>The scenario I have in mind is an RSVP call setup consisting of a
>bidirectional optical path.  Presumably a switching node has to reserve
>data channels and associate them with the optical path when an 
>RSVP PATH
>message arrives.
>
>1) My first question is what is the timing of LMP 
>ChannelActive messages
>relative to RSVP messages.
>
>Do ChannelActive messages flow downstream (relative to call
>establishment direction) more-or-less in phase with PATH messages, and
>upstream (relative to call establishment direction) more-or-less in
>phase with RESV messages?
>
>2) My second question is what addtional information information do
>ChannelActive messages provide?
>
>If a link is to be monitored when associated with an active call, it
>appears the node already has this information.
>
>Regards,
>George.
>edgeflow Inc.
>329 March Rd., Kanata, ON, Canada, K2K 2E1
>phone: +1 613-270-9279 Ext 287
>fax: +1 613-270-9268
>
>
>