Monitor IGMP Snooping

Monitor IGMP snooping to help diagnose potential issues on a device.

1. Display all information about IGMP multicast groups for the device, including configured entries for all groups on all interfaces, all groups on specific interfaces, or specific groups on specific interfaces.
   

   device# show ip igmp groups
   Total Number of Groups: 2
   IGMP Connected Group Membership
   Group Address  Interface Uptime      Expires      Last Reporter   Version
   225.1.1.1      vlan25    00:05:27     00:02:32     25.1.1.1202
   Member Ports: eth 0/24

2. View snooping configuration information.
   

   device# show ip igmp snooping
    Vlan ID: 10
    Multicast Router ports:  eth0/1
    Querier - Disabled
    IGMP Operation mode: IGMPv3
    Is Fast-Leave Enabled : Enabled
    Max Response time = 10
    Last Member Query Interval = 1
    Query interval = 125
    Number of Multicast Groups: 0
   

3. View information about the multicast cache.
   

   device# show ip multicast snooping mcache
   Flags : V2|V3 : IGMP Receiver, P_G : PIM (*,G) Join, P_SG: PIM (S,G) Join
                    BR : PIM Blocked RPT
    Vlan ID : 10
    -------------
   1     (20.20.20.20, 232.0.0.10 )  22:37:48    NumOIF: 1
           Outgoing Ports:
                   eth0/34        Flags: 0x24 ( V3)  00:00:08/252s
   

4. Display the IGMP statistics for a VLAN or interface.
   

   device# show ip igmp statistics vlan 1
    
   IGMP packet statistics for all interfaces in vlan 1:
   IGMP Message type     Edge-Received   Edge-Sent   Edge-Rx-Errors   ISL Received
   Membership Query                  0           0                0              0
   V1 Membership Report              0           0                0              0
   V2 Membership Report              0           0                0              0
   Group Leave                       0           0                0              0
   V3 Membership Report              0           0                0              0
   PIM hello                         0           0                0              0
   
   IGMP Error Statistics:
   Unknown types            0
   Bad Length               0
   Bad Checksum             0
   

5. Display the Layer 3 IGMP interface configuration information.
   

   device# show ip igmp interface
   Interface Ve100
   IGMP enabled
   IGMP query interval 30 seconds
   IGMP other-querierinterval 65 seconds
   IGMP query response time 10 seconds
   IGMP last-member query interval 1 seconds
   IGMP immediate-leave disabled
   IGMP querier100.0.0.1(this system)
   IGMP version 2

6. Display multicast router port information.
   

   device# show ip igmp snooping mrouter vlan 10
   Vlan     Interface    Expires (Sec)
   10       eth0/4       250
   10       eth0/1       238
   

7. Display the SSM mapping with the prefix list name and source address details.
   

   device# show ip igmp ssm-map 
   
   +------------------------------------+-------------------+
   |         PrefixList Name            |   Source Address  |
   +------------------------------------+-------------------+
      ssm-map-230-to-232                 203.0.0.10
     ssm-map-233-to-234                 204.0.0.11