Subject: Liaison from ITU-T Q14/15 on Transport use of LMP

From: "Adrian Farrel" <[email-masked]>
Date: Wed, 9 Mar 2005 18:37:00 -0000

Hi,

This is the second of the two liaisons form an ITU-T meeting held in January that arrived today.
It is an informational liaison and no action is required.

However, the liaison suggests that two items are considered within the Transport LMP draft. I would appreciate it if the editor and authors of that draft sent some thoughts on this to the ccamp list. I can then judge consensus on these thoughts and respond to the liaison as appropriate.

Thanks,
Adrian

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The content of the liaison is as follows:

Subject: Liaison Statement to IETF CCAMP WG on the Comparison of LMP and ASON Discovery
To: Adrian Farrel and Kireeti Kompella, IETF CCAMP co-chairs
From: Alex Zinin and Bill Fenner, IETF Routing Area Directors
        Scott Bradner, IETF liaison to ITU-T

Thank you for your response to our liaison on this topic.  As noted in your liaison some experts from the IETF were able to attend the Q14/15 meeting.  As a result of the discussion of terminology we have the following observations that we suggest should be incorporated into draft-ietf-ccamp-transport-lmp-00.txt to provide some additional context that will aid the members of the IETF in understanding the terminology used by the ITU-T.  

In your liaison you state that an SNPP link could easily be mapped to a TE link.  However, discussion at the meeting revealed some subtle but important differences:

- The SNPP link construct is defined to support hierarchical containment.
  However, since the IETF has not yet addressed hierarchical routing the
  current description of a TE link does not (explicitly) include the 
  notion of hierarchical containment.

- In the ITU the properties of a node are described explicitly in terms of 
  adaptation/termination functions and the binding of these functions to 
  subnetworks (within the node) and links (which are attached to the node).
  In the IETF the capabilities and properties of a node are inferred from 
  the description of the properties of the link ends that terminate on node.
 
An electronic copy of this liaison statement can be found at ftp://sg15opticalt:[email-masked]/tsg15opticaltransport/COMMUNICATIONS/index.html