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    Monitoring IGMP Groups

    Purpose

    Display statically joined and directly connected groups learned through IGMP.

    Action

    To display statically joined and directly connected groups learned through IGMP without OIF mapping:

    host1:boston#show ip igmp groups
    Grp Address   Interface       State      Reporter      ExpTim oldHTo
    ------------- --------------- ----------- ------------ ------ ------
    228.1.1.      FastEthernet1/1 Version3   17.0.0.2        44      0
    228.1.1.2     FastEthernet1/1 Version3   17.0.0.2        50      0
    228.1.1.3     FastEthernet1/1 Version3   17.0.0.2        48      0
    230.1.1.1     FastEthernet1/1 Version3   17.0.0.2        44      0
      Included Sources:
        51.0.0.1                                                    44
        51.0.0.2                                                    44
        51.0.0.3                                                    44
    231.1.1.1     FastEthernet1/1 Version3    17.0.0.2       44      0
      Excluded Sources:
        51.0.0.1                                                     0
        51.0.0.2                                                     0
        51.0.0.3                                                     0
    Counts: 5 version-3, 0 version-2, 0 version-1, 0 check state, 0 disabled
           (5 total)
            0 excluded
            Source-groups: 3 included, 3 excluded

    To display statically joined and directly connected groups learned through IGMP with OIF mapping:

    host1:boston#show ip igmp groups
    Grp Address   Interface       State       Reporter     ExpTim oldHTo
    ------------- --------------- ----------- ------------ ------ ------
    232.1.1.1     ATM5/0.12       Version3    1.1.1.2       371      0
                        oif-map OIFMAP ATM5/0.121              
    232.1.1.1     ATM5/0.13       Version3    1.1.1.3       375      0
                        oif-map OIFMAP ATM5/0.121               
    232.1.1.2     ATM5/0.12       Version3    1.1.1.2       373      0
      Included Sources:
        10.1.1.2        oif-map OIFMAP self                        373
        10.1.1.10       oif-map OIFMAP ATM5/0.120                  373
        10.1.1.11       oif-map OIFMAP ATM5/0.121                  373
    232.1.1.2     ATM5/0.13       Version3    1.1.1.3       375      0
      Included Sources:
        10.1.1.2        oif-map OIFMAP self                        375
        10.1.1.10       oif-map OIFMAP ATM5/0.120                  375
        10.1.1.11       oif-map OIFMAP ATM5/0.121                  375
     
    Counts: 4 version-3, 0 version-2, 0 version-1, 0 check state, 0 disabled
           (4 total)
            0 excluded
            Source-groups: 6 included, 0 excluded

    Meaning

    Table 1 lists the output fields of the show ip igmp groups command.

    Table 1: show ip igmp groups Output Fields

    Field Name

    Field Description

    Grp Address

    Address of the multicast group

    Interface

    Interface that discovered the multicast group

    oif-map

    Name of the OIF map and the mapped OIF interface, when a group or source has been mapped to an OIF

    State

    IGMP version on the interface

    ExpTim

    Time, in seconds, at which the router stops polling for more members of this group

    oldHTo

    Time at which the router stops polling for more IGMPv1 members of a group. If this value is 0, the interface has received no IGMPv1 reports for the group

    Included Sources

    Sources included in the multicast group

    Excluded Sources

    Sources excluded from the multicast group

    Counts

    Number of source-group mappings by version and state

    Published: 2014-08-19