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Cisco Bug: CSCul30680 - N5k restart due to monitor process crash when a VLAN is added/removed

Last Modified

Nov 04, 2020

Products (2)

  • CiscoPro Workgroup EtherSwitch Software
  • CiscoPro Workgroup EtherSwitch Software

Known Affected Releases


Description (partial)

A Nexus 5000 Series switch may reload unexpectedly due to a crash in the 'monitor' service. Last reset reason will be recorded as 'monitor hap reset'.

2014 May 10 10:06:35.637 N5K %$ VDC-1 %$ SYSMGR-2-SERVICE_CRASHED Service "monitor" (PID 3717) hasn't caught signal 11 (core will be saved).
2014 May 10 10:06:35.643 N5K %$ VDC-1 %$ SYSMGR-2-HAP_FAILURE_SUP_RESET System reset due to service "monitor" in vdc 1 has had a hap failure
2014 May 10 10:06:43.815 N5K %$ VDC-1 %$ 10 10:06:43 KERN-0-SYSTEM_MSG Shutdown Ports.. - kernel
2014 May 10 10:06:43.849 N5K %$ VDC-1 %$ 10 10:06:43 KERN-0-SYSTEM_MSG  writing reset reason 16, monitor hap reset - kernel


Last reset at 798270 usecs after  Sat May 10 10:06:43 2014

  Reason: Reset triggered due to HA policy of Reset
  System version: 5.2(1)N1(6)
  Service: monitor hap reset

At least one SPAN session must be configured.

The crash is more likely to occur with a configuration containing a large number of non-consecutive VLANs.

A potential trigger for this crash is the addition or removal of a VLAN. However, it has also been seen to occur with no specific trigger.
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