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 17 lists the output fields of the show ip igmp groups command.

Table 17: 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

Related Documentation