Command:

show ip igmp interface

Mode:

Router>


Syntax:

show ip igmp interface [type number]


Syntax Description:

type

(Optional) Interface type

number

(Optional) Interface number

 

Command Description:

To display multicast-related information about an interface, use the show ip igmp interface EXEC command.

If you omit the optional arguments, the show ip igmp interface command displays information about all interfaces.

This command also displays information about dynamically learned DVMRP routers on the interface.


Example:

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

Router#show ip igmp interface


Ethernet0 is up, line protocol is up
  Internet address is 198.92.37.6, subnet mask is 255.255.255.0
  IGMP is enabled on interface
  IGMP query interval is 60 seconds
  Inbound IGMP access group is not set
  Multicast routing is enabled on interface
  Multicast TTL threshold is 0
  Multicast designated router (DR) is 198.92.37.33
  No multicast groups joined
Ethernet1 is up, line protocol is up
  Internet address is 198.92.36.129, subnet mask is 255.255.255.0
  IGMP is enabled on interface
  IGMP query interval is 60 seconds
  Inbound IGMP access group is not set
  Multicast routing is enabled on interface
  Multicast TTL threshold is 0
  Multicast designated router (DR) is 198.92.36.131
  Multicast groups joined: 225.2.2.2 226.2.2.2
Tunnel0 is up, line protocol is up
  Internet address is 10.1.37.2, subnet mask is 255.255.0.0
  IGMP is enabled on interface
  IGMP query interval is 60 seconds
  Inbound IGMP access group is not set
  Multicast routing is enabled on interface
  Multicast TTL threshold is 0
  No multicast groups joined
 

The table below describes the fields shown in the display.

Table: show ip igmp interface Field Descriptions

Field Description

Ethernet0 is up, line protocol is up

Interface type, number, and status.

Internet address is...
subnet mask is...

Internet address of the interface and subnet mask being applied to the interface, as specified with the ip address command.

IGMP is enabled on interface

Indicates whether IGMP has been enabled on the interface with the ip pim command.

IGMP query interval is 60 seconds

Interval at which the Cisco IOS software sends PIM router-query messages, as specified with the ip igmp query-interval command.

Inbound IGMP access group is not set

Indicates whether an IGMP access group has been configured with the ip igmp access-group command.

Multicast routing is enabled on interface

Indicates whether multicast routing has been enabled on the interface with the ip pim command.

Multicast TTL threshold is 0

Packet time-to-threshold, as specified with the ip multicast ttl-threshold command.

Multicast designated router (DR) is...

IP address of the designated router for this LAN segment (subnet).

Multicast groups joined:
No multicast groups joined

Indicates whether this interface is a member of any multicast groups and, if so, lists the IP addresses of the groups.


Misconceptions:

None
 

Related commands:

ip multicast ttl-threshold
ip igmp join-group

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