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Video Pixelation is observed when running PIM-Dense on EXOS device

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TitleVideo Pixelation is observed when running PIM-Dense on EXOS device
Symptoms
  • video pixelation
  • some streams affected but not all
  • some groups not pruned
  • high bcm_rx
Environment
  • Summit: All
  • EXOS: All
  • Pim-Dense
Cause
When there is a high amount of multicast traffic the tables can become over loaded and some addresses do not get stored properly.  Therefore this traffic is repeatedly sent to the CPU for slow path forwarding which can create problems for streams susceptible to latency. 
Resolution
Issue the following command:
  1. configure forwarding ipmc compression group-table
    1. this will enable compression of entries in the IP multicast group table to facilitate improved IP multicast scaling
Additional notes
Ideally, the preferred method is to identify the multicast traffic and determine if it is necessary.

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