C
HAPTER
39
| Multicast Filtering Commands
IGMP (Layer 3)
– 944 –
COMMAND MODE
Privileged Exec
COMMAND USAGE
Enter the address for a multicast group to delete all entries for the
specified group. Enter the interface option to delete all multicast groups for
the specified interface. Enter no options to clear all multicast groups from
the cache.
EXAMPLE
The following example clears all multicast group entries for VLAN 1.
Console#clear ip igmp interface vlan1
Console#
show ip igmp
groups
This command displays information on multicast groups active on the
switch and learned through IGMP.
SYNTAX
show ip igmp groups [{group-address | interface} [detail] | detail]
group-address - IP multicast group address.
interface
vlan vlan-id - VLAN ID. (Range: 1-4093)
detail - Displays detailed information about the multicast process
and source addresses when available.
COMMAND MODE
Privileged Exec
COMMAND USAGE
To display information about multicast groups, IGMP must first be enabled
on the interface to which a group has been assigned using the ip igmp
command, and multicast routing must be enabled globally on the system
using the ip multicast-routing command.
EXAMPLE
The following shows options for displaying IGMP group information by
interface, group address, and static listing.
Console#show ip igmp groups
GroupAddress InterfaceVlan Lastreporter Uptime Expire V1Timer
--------------- --------------- --------------- -------- -------- --------
224.0.17.17 1 192.168.1.10 0:0:1 0:4:19 0:0:0
Console#show ip igmp groups 234.5.6.8
GroupAddress InterfaceVlan Lastreporter Uptime Expire V1Timer
--------------- --------------- --------------- -------- -------- --------
224.0.17.17 1 192.168.1.10 0:0:1 0:4:19 0:0:0
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