IGMP Interface Information

IGMP Interface Information

msfc_15#show ip igmp interface vlan 3

Vlan3 is up, line protocol is up

  Internet address is 10.1.3.10/24

  IGMP is enabled on interface

  Current IGMP host version is 2

  Current IGMP router version is 2

  IGMP query interval is 60 seconds

  IGMP querier timeout is 120 seconds

  IGMP max query response time is 10 seconds

  Last member query response interval is 1000 ms

  Inbound IGMP access group is not set

  IGMP activity: 2 joins, 0 leaves

  Multicast routing is enabled on interface

  Multicast TTL threshold is 0

  Multicast designated router (DR) is 10.1.3.10 (this system)

  IGMP querying router is 10.1.3.10

  Multicast groups joined (number of users):

      239.1.1.1(1) 224.0.1.40(1)

The show igmp groupinfo, a hidden command, will show whether or not the multicast traffic from the source has any receivers. In Example 9-6, the multicast source only field isset at false, which means that receivers exist for the 239.1.1.1 traffic. If the value was set at true, the source is sending traffic but no receivers exist to get the multicast stream. The show IGMP groupinfo command can be useful when troubleshooting multicast-related issues.