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Chapter 20
Configuring IGMP Snooping and MVR
Displaying IGMP Snooping Information
You can display IGMP snooping information for dynamically learned and statically configured router
ports and VLAN interfaces. You can also display MAC address multicast entries for a VLAN configured
for IGMP snooping.
To display IGMP snooping information, use one or more of the privileged EXEC commands in
Table
Table 20-4
Commands for Displaying IGMP Snooping Information
Command
show ip igmp snooping [vlan vlan-id]
show ip igmp snooping groups [count |dynamic
[count] | user [count]]
show ip igmp snooping groups vlan vlan-id
[ip_address | count | dynamic [count] |
user[count]]
show ip igmp snooping mrouter [vlan vlan-id]
show ip igmp snooping querier [vlan vlan-id]
show ip igmp snooping querier [vlan vlan-id]
detail
78-17058-01
20-4.
Purpose
Display the snooping configuration information for all VLANs on the
switch or for a specified VLAN.
(Optional) Enter vlan vlan-id to display information for a single VLAN.
The VLAN ID range is 1 to 1001 and 1006 to 4094.
Display multicast table information for the switch or about a specific
parameter:
•
•
•
Display multicast table information for a multicast VLAN or about a
specific parameter for the VLAN:
•
•
•
•
•
Display information on dynamically learned and manually configured
multicast router interfaces.
Note
(Optional) Enter vlan vlan-id to display information for a single VLAN.
Display information about the IP address and incoming port for the
most-recently received IGMP query messages in the VLAN.
(Optional) Enter vlan vlan-id to display information for a single VLAN.
Display information about the IP address and incoming port of the
most-recently received IGMP query message in the VLAN,and the
configuration and operational state of the IGMP snooping querier in the
VLAN.
count—Display the total number of entries for the specified
command options instead of the actual entries.
dynamic—Display entries learned through IGMP snooping.
user—Display only the user-configured multicast entries.
vlan-id—The VLAN ID range is 1 to 1001 and 1006 to 4094.
count—Display the total number of entries for the specified
command options instead of the actual entries.
dynamic—Display entries learned through IGMP snooping.
ip_address—Display characteristics of the multicast group with the
specified group IP address.
user—Display only the user-configured multicast entries.
When you enable IGMP snooping, the switch automatically
learns the interface to which a multicast router is connected.
These are dynamically learned interfaces.
Cisco ME 3400 Ethernet Access Switch Software Configuration Guide
Displaying IGMP Snooping Information
20-15
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