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Multicast Traffic Causing High CPU utilization on S-Series, Securestack, G-Series, N-Series and K-Series

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Information

 
TitleMulticast Traffic Causing High CPU utilization on S-Series, Securestack, G-Series, N-Series and K-Series
Symptoms
  • High CPU utilization
  • Top task switch packet processing
  • All ports have significantly higher Multicast counts than broadcast counts
Environment
  • S-Series
  • C5-Series
  • B5-Series
  • 7100-Series
  • K-Series
  • G-Series
  • All firmware versions
Cause
Multicast services on network that they were unaware of
 
Resolution
  • Enable IGMPSnooping on all switches
  • Enable IGMP query on each vlan

 
Additional notes

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