Displaying Igmp Snooping Information - Cisco 2950 - Catalyst Switch Configuration Manual

Chapter 21 Configuring IGMP Snooping and MVR
To disable the aging of the forwarding table entries, enter the ip igmp snooping source-only-learning
age-timer 0 global configuration command.
If you disable source-only learning by using the no ip igmp snooping source-only learning global
configuration command and the aging time is enabled, it has no effect on the switch.

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 21-4 Commands for Displaying IGMP Snooping Information
Command
show ip igmp snooping [vlan vlan-id]
show ip igmp snooping group [vlan vlan-id]
show ip igmp snooping mrouter [vlan vlan-id]
show ip igmp snooping querier [vlan vlad-id]
show mac address-table multicast [vlan vlan-id]
[user | igmp-snooping] [count]
For more information about the keywords and options in these commands, refer to the command
reference for this release. For examples of output from the commands in
command reference for this release.
78-11380-10
21-4.
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.
Display information about the IGMP multicast groups, the compatibility
mode, and the ports that are associated with each group.
(Optional) Enter vlan vlan-id to display information for a single 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 IGMP version that an interface supports.
(Optional) Enter vlan vlan-id to display information for a single VLAN.
Display the Layer 2 MAC address table entries for a VLAN. The
keywords are all optional and limit the display as shown:
•
•
•
•
When you enable IGMP snooping, the switch automatically
learns the interface to which a multicast router is connected.
These are dynamically learned interfaces.
vlan vlan-id—Displays only the specified multicast group VLAN.
user—Displays only the user-configured multicast entries.
igmp-snooping—Displays only entries learned through IGMP
snooping.
count—Displays only the total number of entries for the selected
criteria, not the actual entries.
Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide
Displaying IGMP Snooping Information
Table 21-4, refer to the
21-13