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VOSS High CPU Utilization Due to UPNP Multicast Traffic

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TitleVOSS High CPU Utilization Due to UPNP Multicast Traffic
  • High CPU utilization is seen or logged
0x00210587 08400001.1 DYNAMIC SET GlobalRouter KHI WARNING Pthread(smltSlave tid 5425)'s CPU 5-minute average is 82.3, above 80%
show khi performance cpu
         Current utilization: 79  
         1-minute average utilization: 75  
         1-minute high water mark: 75 (04/18/19 17:48:34) 
         5-minute average utilization: 52  
         5-minute high water mark: 70 (04/15/19 13:30:03)
  • VOSS platforms
  • VSP 8600
  • All supported releases
  • Product is functioning as designed
  • Issue is due to multicast group (UPNP) containing multiple forwarding entries on the switch
  • Recommendations to reduce the IGMP load on the system.
ip prefix-list "upnp_drop_239" ge 32 le 32
interface vlan X
ip igmp access-list "upnp_drop_239" deny-both
Additional notes
  • The multicast group is used by the Simple Service Discovery Protocol (SSDP). Therefore, when SSDP is enabled on any servers or PCs, the servers or PCs send multicast packets with group address to the switch.
  • In this scenario, following are the steps to disable the SSDP service on the server/PC/end station
  1. On the Control Panel , click the Administrative Tools icon, and then click the Services icon.
  2. Find out SSDP Discovery Service in the service list and disable the service.
  • If this group is in use for any of the multicast applications, then change the group address from to any other group address.
  • If the above pointers do not stand aligning to the end user network needs, then add an IGMP static group which avoids recursive updating of the leaf list for the multicast group every time an IGMP leave request is received, thus avoiding the latency and CP switchover issues.
interface vlan 1
ip igmp static-group 4/21 static




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