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ClusterXL failover due to multiple pnotes on VSX cluster Technical Level
Symptoms
  • Cluster failover seems to be constantly happening for VSX clusters every few seconds / minutes.
  • Cluster failover on VSLS clusters although the issue may not be noticeable due to automatic recovery after a few seconds.
  • External monitoring system (SNMP server for instance) gets multiple alerts regarding cluster failover, although service does not seem to be impacted.
  • Logs from fwk.elg at the Virtual System level show multiple different pnotes as the cause of the issue ('VSX', 'routed', 'sync').
  • Cluster debugs (fw ctl debug -m cluster + stat pnote ccp conf) show the pnote messages and transitions but no clear indication of the root cause.
Cause

ClusterXL ccp mode 'multicast' is not fully supported by network devices.


Solution
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