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Cisco Bug: CSCue79881 - SNMP crashes on SNMP bulk get query on Nexus (all platforms) and MDS switches

Last Modified

Aug 01, 2019

Products (4)

  • Cisco Nexus 7000 Series Switches
  • Cisco Nexus 7000 10-Slot Switch
  • Cisco Nexus 7000 18-Slot Switch
  • Cisco Nexus 7000 9-Slot Switch

Known Affected Releases

5.2(7) 5.2(7)S20 6.1(1.66)S0 6.1(3) 6.1(4)S17 6.2(0.294)S11 6.2(0.294)S12 6.2(1.23)

Description (partial)

Symptom:
The SNMP process may crash with the following messages displayed in the output of <i> show logging log</i>

<pre>
%KERN-2-SYSTEM_MSG: mts_is_q_space_available_new():1416:Total mtsbuf size 10070872 for sap 28, exceeds limit 15 perc of 67108864 - kernel
%KERN-2-SYSTEM_MSG: mts_acquire_q_space()  failing - no space in sap 28, uuid 26 send_opc 3176, pid 3616, proc_name sctpt_rx_thr - kernel
%KERN-2-SYSTEM_MSG: [sap 28][pid 4406][comm:snmpd] sap recovering failed and so Killed - kernel
%SYSMGR-2-SERVICE_CRASHED: Service "snmpd" (PID 4406) hasn't caught signal 6 (core will be saved).
</pre>

Conditions:
This bug affects both all Nexus (Nexus 7000, Nexus 5000, Nexus 3000, and Nexus 9000) and MDS switches. It has been observed when a monitoring device is using snmp-bulk-get requests on the entity-MIB for multiple FEX modules at one time, or if there is continuous polling from multiple polling stations on slow mibs.

Some examples of mibs that may be affected by contiuous snmp bulk walk are qos mib, entity mib, entity-fru mib, bridge mib.

Related Community Discussions

<key>CSCue79881</key> - SNMP crashes on SNMP bulk get query
Hi, My customer has suffered a switch reboot following both supervisors reset at almost the same time, this has been attributed to this bug. They have plans to upgrade their MDS switches to 6.2(15), but in the mean time want a way to check all switches to see if they are in danger of another switch (or the same switch) having the same thing happen. Where this article states; Further Problem Description: A possible way of verifying if you are affected by this bug is to issue the command show system ...
Latest activity: Sep 15, 2016
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