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MTU Size Exceeded Messages Flooding Log File

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Information

 
TitleMTU Size Exceeded Messages Flooding Log File
Symptoms
  • Switch logging MTU size exceeded messages frequently
GlobalRouter SW WARNING MTU size exceeded for 10.10.10.27, requested MTU size = 1456, selected MTU size = 0
  • IP address in log message correlates to WiFi clients on WiFi network
Environment
  • VSP 8600
  • Release 6.2.0.2
  • Meru/Fortinet WiFi
Cause
  • Product functioning as designed
  • Log message triggered by need to fragment in response to ICMP echo reply from switch
  • Client ICMP echo request has Don't Fragment bit set
Resolution
  • Check MTU on devices along path between WiFi client and VSP 8600
Additional notes

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