Displaying Igmp Snooping Information - Cisco 2950G 24 - Catalyst Switch Software Configuration Manual

Chapter 17 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 17-4 Commands for Displaying IGMP Snooping Information
Command
show ip igmp snooping [vlan vlan-id]
show ip igmp snooping mrouter [vlan vlan-id]
show mac address-table multicast [vlan vlan-id]
[user | igmp-snooping] [count]
This is an example of output from the show ip igmp snooping privileged EXEC command for all VLAN
interfaces on the switch:
Switch# show ip igmp snooping
vlan 1
----------
IGMP snooping is globally enabled
IGMP snooping is enabled on this Vlan
IGMP snooping immediate-leave is disabled on this Vlan
IGMP snooping mrouter learn mode is pim-dvmrp on this Vlan
IGMP snooping is running in IGMP_ONLY mode on this Vlan
vlan 2
----------
IGMP snooping is globally enabled
IGMP snooping is enabled on this Vlan
IGMP snooping immediate-leave is disabled on this Vlan
IGMP snooping mrouter learn mode is pim-dvmrp on this Vlan
IGMP snooping is running in IGMP_ONLY mode on this Vlan
vlan 10
----------
IGMP snooping is globally enabled
IGMP snooping is enabled on this Vlan
78-14982-01
17-4.
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 on dynamically learned and manually configured
multicast router interfaces.
Note
(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 Desktop Switch Software Configuration Guide
Displaying IGMP Snooping Information
17-11