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Cisco Bug: CSCup92207 - Post Upgrade Increase in Attach Failures and RAU Failures-Stuck Sessmgr

Last Modified

Feb 05, 2017

Products (1)

  • Cisco ASR 5000 Series

Known Affected Releases

14.0(48)

Description (partial)

Symptom:
After the upgrade, we noticed a higher than normal number of Attach Failures and RAU Failures.
Through packet captures, we discovered that these failures were due to 'network reject', and further that this was correlated to authentication timeouts on MAP between SGSN and HLR.
-This problem is being observed only on this SGSN which was upgraded, we have another SGSN in the pool which is not affected in any way, despite talking to the same HLR.
-On further analysis it was seen that the number of sessions on sessmgr 27 was lower than other sessmgrs and it seemed that it was causing the failures
Sessmgr instance 27 was restarted and the issue was resolved

The ticket is initiated to analyze the core files for sessmgr 27 task and why it was in stuck state.

Conditions:
Upgrade from old release 14.0.53368 to new release 14.0.55485
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