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High “Router Multicast” CPU utilization

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Information

 
TitleHigh “Router Multicast” CPU utilization
Symptoms
  • Speed test tool times out
  • High CPU utilization with “Router Multicast” as top task
show system utilization process
<cut>
Router Multicast               18      45.4%   16.9%   12.3%
</cut>
Environment
  • S Series
  • K Series
  • 1700 Series
Cause
Unnecessary routing of multicast traffic

 
Resolution
remove dvmrp from vlan interface
router
configure
interface vlan.0.<VLID>
no ip dvmrp
Additional notes
DVMRP is no longer required because the video system is no longer installed.    

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