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Cisco Bug: CSCur04175 - 17.0 - MME/SGSN snmp trap "Congestion" with max sessions wrongly hit

Last Modified

Feb 08, 2017

Products (1)

  • Cisco ASR 5000 Series

Known Affected Releases

17.0.0.56922

Description (partial)

Symptom:
17.0 - MME/SGSN snmp trap "Congestion" with max sessions wrongly hit

On a mme/sgsn combo chassis under load conditions of 2 million subscribers, when MME congestion control is enabled, below trap is generated continuously with statistics counter incremented rapidly at high rate.

Fri Sep 26 04:28:07 2014 Internal trap notification 81 (Congestion) service type sgsn congestion policy none, resource type maxsessions

Below stats counter increases and toggles with applied and cleared continuously.

[local]F43# show congestion-control statistics imsimgr
 Current congestion status:                              Applied
 Current congestion Type  :                              Critical
 Congestion applied:                                     703329 times
 Critical Congestion Control Resource Limits
  system cpu use exceeded:                               No
  service cpu use exceeded:                              No
  system memory use exceeded:                            No
  port rx use exceeded:                                  No
  port tx use exceeded:                                  No
  port specific rx use exceeded:                         No
  port specific tx use exceeded:                         No
  max sess use exceeded:                                 Yes
  license use exceeded:                                  No
  msg queue size use exceeded:                           No
  msg queue wait time exceeded:                          No
  license threshold exceeded:                            No
 SGSN Congestion Control:
   MM Congestion Level:                                  None
   Congestion Resource:                                  None
   SM Congestion Level:                                  None
   O&M Congestion Level:                                 None

[local]F43# show snmp trap statistics | grep Conges
Congestion                          721507     0  720527  2014:09:26:04:43:30

Conditions:
MME Congestion policy enabled and under load conditions.
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