Command:

show ip igmp groups


Mode:

Router>


Syntax:

show ip igmp groups [group-name | group-address | type number] [detail]

 

Syntax Description:

group-name (Optional) Name of the multicast group, as defined in the Domain Name System (DNS) hosts table.
group-address (Optional) Address of the multicast group. This is a multicast IP address in four-part, dotted notation.
type (Optional) Interface type.
number (Optional) Interface number.
detail (Optional) Provides a detailed description of the sources known through IGMP Version 3 (IGMPv3), IGMP v3lite, or URL Rendezvous Directory (URD).

 

Command Description:

To display the multicast groups with receivers that are directly connected to the router and that were learned through Internet Group Management Protocol (IGMP), use the show ip igmp groups command in EXEC mode.

If you omit all optional arguments and keywords, the show ip igmp groups command displays by group address, interface type, and interface number all directly connected multicast groups.


Example:

The following is sample output from the show ip igmp groups command:

Router#show ip igmp groups 
IGMP Connected Group Membership
Group Address     Interface         Uptime      Expires     Last Reporter
239.255.255.254   Ethernet3/1       1w0d        00:02:19    172.21.200.159
224.0.1.40        Ethernet3/1       1w0d        00:02:15    172.21.200.1
224.0.1.40        Ethernet3/3       1w0d        never       171.69.214.251
224.0.1.1         Ethernet3/1       1w0d        00:02:11    172.21.200.11
224.9.9.2         Ethernet3/1       1w0d        00:02:10    172.21.200.155
232.1.1.1         Ethernet3/1       5d21h       stopped     172.21.200.206


The following is sample output from the show ip igmp groups command with the group-address argument and detail keyword:

Router#show ip igmp groups 232.1.1.1 detail 
Interface: Ethernet3/2
Group: 232.1.1.1
Uptime: 01:58:28
Group mode:     INCLUDE
Last reporter: 10.0.119.133
CSR Grp Exp: 00:02:38
Group source list: (C - Cisco Src Report, U - URD, R - Remote)
  Source Address Uptime v3 Exp CSR Exp Fwd Flags
171.69.214.1 01:58:28 stopped 00:02:31 Yes C




show ip igmp groups Field Descriptions
Field Description
Group Address Address of the multicast group.
Interface Interface through which the group is reachable.
Uptime How long (in weeks, days, hours, minutes, and seconds) this multicast group has been known.
Expires How long (in hours, minutes, and seconds) until the entry expires. If an entry expires, then it will (for a short period) show the word "now" before it is removed.

The word "never" indicates that the entry will not time out, because a local receiver is on this router for this entry.

The word "stopped" indicates that timing out of this entry is not determined by this expire timer. If the router is in INCLUDE mode for a group, then the whole group entry will time out after the last source entry has timed out (unless the mode is changed to EXCLUDE mode before it times out).

Last Reporter Last host to report being a member of the multicast group. Both IGMP v3lite and URD require a v2-report.
Group mode: Can be either INCLUDE or EXCLUDE. The group mode is based on the type of membership reports received on the interface for the group. In the output for the show ip igmp groups detail command, the EXCLUDE mode also shows the "Expires:" field for the group entry (not shown in the output).
CSR Grp Exp This field is shown for multicast groups in the Source Specific Multicast (SSM) range. It indicates the time (in hours, minutes, and seconds) since the last received group membership report was received. Cisco IOS software needs to use these reports for the operation of URD and IGMP v3lite, but they do not indicate group membership by themselves.
Group source list: Provides details of which sources have been requested by the multicast group.
Source Address IP address of the source.
Uptime Indicates the time since the source state was created.
v3 Exp Indicates the time (in hours, minutes, and seconds) until the membership for the source will time out according to IGMP operations. The word "stopped" is shown if no member uses IGMPv3 (but only IGMP v3lite or URD).
CSR Exp Indicates the time (in hours, minutes, and seconds) until the membership for the source will time out according to IGMP v3lite or URD reports. The word "stopped" is shown if members use only IGMPv3.
Fwd Indicates whether the router is forwarding multicast traffic due to this entry.
Flags Information about the entry. The Remote flag indicates that an IGMPv3 report has been received by this source. The C flag indicates that an IGMP v3lite or URD report was received by this source. The U flag indicates that a URD report was received for this source.




Misconceptions:

None


Related Commands:

None

� Cisco Systems, Inc. 2001, 2002, 2003
World Wide Education

Converted from CHM to HTML with chm2web Pro 2.85 (unicode)