Cisco WS-C3550-12G Software Configuration Manual page 326
Multilayer switch
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Displaying IGMP Snooping Information
Table 11-4 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
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
Catalyst 3550 Multilayer Switch Software Configuration Guide
11-10
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
When you enable IGMP snooping, the switch automatically
learns the interface to which a multicast router is connected.
These are dynamically learned interfaces.
(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:
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.
Chapter 11
Configuring IGMP Snooping and MVR
78-11194-03
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