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What does "Total number of IGMP data packets switched" counter mean in l2stats

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TitleWhat does "Total number of IGMP data packets switched" counter mean in l2stats
Question
  • What does "Total number of IGMP data packets switched" counter mean in show l2stats output and how does this counter get incremented? 
     X460G2-24p-10G4.3 # show l2stats "Data"
    Bridge interface on VLAN Data:
    Total number of packets to CPU = 5000.
    Total number of packets learned = 4138.
    Total number of MPLS PW packets examined = 0.
    Total number of MPLS PW packets learned = 0.
    Total number of IGMP control packets snooped = 3.
    Total number of IGMP data packets switched = 3912491.
    Total number of MLD control packets snooped = 0.
    Total number of MLD data packets switched = 0.
    
    
Environment
  • EXOS 
  • Summit
  • BlackDiamond
Answer
  • "Total number of IGMP data packets switched" means Total number of Multicast data packets sent to CPU.
  • "Total number of IGMP data packets switched" will get incremented if traffic is sent to 224.0.0.2 or 224.0.0.5 with multicast Mac address.
  • ​Please not that if traffic is sent to 224.0.0.2 or 224.0.0.5 with the unicast Mac address, the above counter will not increment.
  • "Total number of IGMP data packets switched" will not increment if traffic is sent to 224.128.0.2 or 225.0.0.2 (Multicast Group other than 224.0.0.x/24) even though using Multicast Mac address.
  • "Total number of IGMP data packets switched" counter counts all protocol related Multicast messages in Known Multicast Group 224.0.0.x/24 range.
Additional notes
  •  Please note that Multicast Group 224.0.0.x/24 range always goes to the CPU.

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