Subject: [GSMP] GSMPv3 & L2C

From: "Sanjay Wadhwa" <[email-masked]>
Date: Mon, 14 Feb 2005 17:08:13 -0500

Section 3.1.4 in the GSMPv3 draft describes extension TLVs. There is a restriction of "at most one extension TLV per message type". Is there a particular reason for this restriction ? There might be cases where a particular technology needs more than one such (optional) TLV in a message. One option could be to have the "extension value" be composed of multiple sub-TLVs (with their own well defined format). But, it is simpler to allow multiple top level TLVs. Based on the "length" in the GSMP message header and the "length" in each TLV, the parsing is not a problem. For sanity check number of TLVs in the message can be included in the message. The device that does not understand a particular TLV can silently ignore the TLV and continue on.
In context of L2C this is needed for a BRAS (controller) to configure line characterstics of a DSL line on a DSLAM. There is more than one parameter that can be configured (multiple, optional TLVs in the port management message seems like an appropriate way to implement this functionality). Any thoughts on not having the restriction of a single "extension" TLV per message type ?

Thanks
-Sanjay

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