Processor Outage and Resynchronizing Sequence Numbers

To the mailing list,

In the M2PA RFC it details how to resynchronize sequence numbers after
LPR/RPR as follows:

		M2PA (at both the LPO and RPO ends) uses the BSN value
in the
		received Link Status Ready message to resynchronize its
sequence
		numbers, if this is required by MTP2.  
 
The problem is the "required by MTP2" issue.  If one side resynchronizes
its FSN to the BSN received in the READY message, but the other side
didn't implement this, then the FSN on the next MSU received would be
wrong and the MSU will be discarded.

For example, I am running M2PA conformance tests against the INET.  It
doesn't resynchronize its FSN to the incoming BSN as described above.
So the next FSN sent by the Inet is not expected and is discarded.

So, the question is, is the resynchronizing really optional?  Or am I
misunderstanding the meaning of synchronize and the FSN is not set to
the BSN of the incoming READY message?

Thanks,
Martin


Martin Hecht
Engineering
Signaling Core Group
Comverse
Office: +856 608-2712
[email protected]
www.comverse.com <http://www.comverse.com/>

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