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Wrong OAM parameter impact traffic down on PW

Publication Date:  2012-07-25 Views:  45 Downloads:  0
Issue Description


Topology is below. 3 Hybrid MSTP NEs connected as link


NE1(OSN3500)----NE2(OSN3500)------NE3(OSN3500)


configure ETH service on PW between NE1 and NE3, NE1 and NE3 report MPLS_PW_LOCV alarm.

traffic down


Alarm Information


MPLS_PW_LOCV


Handling Process


1. Check any phsical damage on fiber,check any abnormal alarm about laser or port.

    Check physical fiber connection, make sure no wrong connection happened.

2. Check PW label configured site by site.

3. Query PW OAM parameter on both sites, NE1 site configured CV mode, NE3 use FFD, problem point found.

4. Change OAM parameter on NE1 to FFD 3.3ms, the same with NE3,alarm disappear. traffic recover 


Root Cause


Reason1: Physical link down,or wrong link connection

Reason2: PW configuration wrong.

Reason3: PW configuration wrong.OAM parameters on both sites  mismatch

Suggestions


All PW OAM parameter should be the same on LSP,wrong configuration would impact traffic.


END