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High CPU after upgrade to 8.42 track - Task is tDispatch ( tIcmpErr, tFujiRx, tMcnxmgr3 )

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TitleHigh CPU after upgrade to 8.42 track - Task is tDispatch ( tIcmpErr, tFujiRx, tMcnxmgr3 )
Symptoms
  • High CPU after upgrade to 8.42 firmware track
  • Elevated task is tDispatch ( tIcmpErr, tFujiRx, tMcnxmgr3 )
  • high invalidation count 
  • High icmp redirect counts recorded
Environment
  • S-Series 
  • Firmware 8.42.01
  • Firmware 8.42.02
  • icmp redirects enabled 
  • secondary interfaces configured
Cause
Given a router interface with secondary addresses configured, a packet from one subnet configured on the interface destined to another subnet configured on the interface can incorrectly result in an ICMP Error/Redirect packet sent to the source of the packet. It’s related to icmp redirects. Configurations with secondary’s and redirects, will cause the issue.
 
Resolution
Upgrade to 8.42.04

Workaround : disable icmp redirects if possible.
 
Additional notes

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