Cisco Cisco IOS Software Release 12.0(19)S
Explicit Tracking of Hosts, Group, and Channels for IGMP Version 3
show ip igmp membership
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Cisco IOS Release 12.0(19)S
The following is sample output from the show ip igmp membership command with the multicast group
address 239.1.1.1 and the tracked keyword specified:
address 239.1.1.1 and the tracked keyword specified:
Router> show ip igmp membership 239.1.1.1 tracked
Flags:A - aggregate, T - tracked
L - Local, S - static, V - virtual, R - Reported through v3
I - v3lite, D - Urd, M - SSM (S,G) channel
1,2,3 - The version of IGMP, the group is in
Channel/Group-Flags:
/ - Filtering entry (Exclude mode (S,G), Include mode (*,G))
Reporter:
<ip-address> - last reporter if group is not explicitly tracked
<n>/<m> - <n> reporter in include mode,<m> reporter in exclude
Channel/Group Reporter Uptime Exp. Flags Interface
*,239.1.1.1 2/0 00:00:11 stop 3AT Et2/0
10.30.0.100,239.1.1.1 10.10.0.10 00:00:11 02:48 RT Et2/0
10.30.0.101,239.1.1.1 10.10.0.20 00:00:03 02:56 RT Et2/0
10.30.0.101,239.1.1.1 10.10.0.10 00:00:11 02:48 RT Et2/0
10.30.0.102,239.1.1.1 10.10.0.20 00:00:03 02:56 RT Et2/0
describes the significant fields shown in the displays.
Table 1
show ip igmp membership Field Descriptions
Field
Description
Channel/Group
(S, G) channel or multicast group filtering entry.
Reporter
Displays information about the the hosts reporting membership with
the (S, G) channel or multicast group entry.
the (S, G) channel or multicast group entry.
Uptime
The Uptime timer is how long (in weeks, days, and seconds) the
entry has been known.
entry has been known.
Exp.
The Exp. timer is how long (in minutes and seconds) until the entry
expires.
expires.
Flags
Provides information about the entry.
A - aggregate
Indicates that the aggregate information for the (S, G) channel or
multicast group is being displayed.
multicast group is being displayed.
T - tracked
Indicates that the multicast group is configured with the explicit
tracking feature.
tracking feature.
L - Local
Indicates that the router itself is interested in receiving the traffic for
this multicast group or channel. In order for the application to
receive this traffic, the packets are sent to the process level of the
router. When the ip igmp join-group command is configured for a
multicast group, the L flag is set.
this multicast group or channel. In order for the application to
receive this traffic, the packets are sent to the process level of the
router. When the ip igmp join-group command is configured for a
multicast group, the L flag is set.
S - static
Indicates that the multicast group or channel is forwarded on the
interface. When the ip igmp static-group command is configured
on the interface, the S flag is set.
interface. When the ip igmp static-group command is configured
on the interface, the S flag is set.
V - virtual
Indicates that there is a service such as Hoot and Holler running on
the router requesting the traffic for the multicast group or channel.
These services can process IP multicast traffic in the fast switching
path. The L flag will not be set by these applications.
the router requesting the traffic for the multicast group or channel.
These services can process IP multicast traffic in the fast switching
path. The L flag will not be set by these applications.
R - Reported through v3
Indicates that an IGMPv3 report was received for this entry.