I have been having a problem with our SNMP Manager (CA Spectrum)
The problem is that Spectrum is reporting "Excessive Interface Reconfiguration" alarms on a lot for our switches and routers (various types and IOS levels)
when in reality nothing is happening to the devices
This alarm is based on the following MIBs ifStackLastChange and ifTableLastChange
When first looking at these values they are not changing but when I look at the raw values they are changing a little but not enough to affect how a MIB browser displays the duration since last change, see example below
I believe that the ifTableLastChange MIB should show the sysuptime at the time that the Iftable last changed so if there had been a change in the Iftable between 12:05 and 13:14 I would have expected the value of fTableLastChange to have changed to 330days 13hours etc
Also the value offTableLastChange is 4 less at 13:14 than it was at 12:05
we also experience the mentioned problems with ca spectrum.
I assume Joe refers to OID 126.96.36.199.188.8.131.52.5 (ifTableLastChange) which is wrongly changed by the cisco switches and which triggers an interface reconfiguration in spectrum.
BugID CSCsh93041 refers to OID 184.108.40.206.220.127.116.11.1.9.49 (ifLastChange) which seems to be slight different from the one mentioned above.
While ifLastChange changes every time an interface changes it's operational state (e.g. connected, not connected, admin down), ifTableLastChange should only change when an interface is created or deleted from the ifTable (e.g. inserting or removing a linecard).
Does anybody else know about this strange behaviour of ifTableLastChange?
We experience this errors on several switches like
The bug as it is written is misleading. This bug DOES account for the change in ifTableLastChange, ifLastChange, and ifStackLastChange. The bug which details the problems with ifTableLastChange and ifStackLastChange is CSCsx26467 which was duped to CSCsh93041. This bug is fixed in 12.2(52)SG for the Cat4K. I'm not seeing any report of a fix for the 3550 or for mainline IOS. It is not clear those platforms are actually affected.
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