ATM errors Correlation tag

Apr 29, 2005 2 Replies

We are having some issues with one of our ATM circuits flapping, after adding debug atm events and errors we are getting this output. Does anyone have any ideas what this error is?



Apr 29 09:03:09: ATM_OAM(ATM1/0): Bad Correlation tag. Received



0x401FB, Expected 0x401FC from VPI:1 VCI:33

Many thanks


Jonathan


ATM OAM F5 loopback cells have a field called Correlation Tag (CTAG). If "oam-pvc manage" is enabled on ATM PVC then these cells are sent out with incrementing CTAG and the router expects to receive them back with same CTAG. It looks like they are being returned but with incorrect CTAG (expected CTAG

0x401FC actually received 0x401FB) , I've seen a similar error earlier, fixed with SW upgrade on remote end (non-Cisco box). HTH, Cheers Alex

Many thanks

J> ATM OAM F5 loopback cells have a field called Correlation Tag (CTAG). If

(expected CTAG

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