Cisco Bug: CSCue79881 - SNMP crashes on SNMP bulk get query on Nexus (all platforms) and MDS switches
Aug 01, 2019
- 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)
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.
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