M2PA Alignment Clarification

All:

 

We recently came across a sequencing problem that I think was dealt with
in PO procedures, but wasn't addressed for alignment.

 

There was an M2PA link routed over an IP network that was fairly
unstable - that is, there was a fair amount of packet loss/retransmits
occurring.  During alignment when establishing the link, the near end
had completed proving and transmitted LSR, but the far end was still
transmitting proving messages.  The far end sent its final proving
messages which were dropped by the network, blocking stream 0.  In the
meantime, the far end transmitted a DATA message containing a SS7 SLTM
on stream 1.  The near end received the SLTM, and, even though it hadn't
received a LSR, placed the link in service.  After this transition, the
near end received the remaining proving messages retransmitted by the
far end to unblock stream 0, at which point the link was taken out of
service due to the apparently missequenced messages.

 

The simple/obvious answer to this is to ignore any proving messages
received by an endpoint once the link is transitioned to in service.  Is
there a better way to handle this situation?

 

Mark

_______________________________________________
Sigtran mailing list
[email protected]
https://www1.ietf.org/mailman/listinfo/sigtran