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Chapter 23
Configuring IGMP Snooping and MVR
This example shows how to configure IGMP snooping to use CGMP packets as the learning method and
verify the configuration:
Switch# configure terminal
Switch(config)# ip igmp snooping vlan 1 mrouter learn cgmp
Switch(config)# end
Switch# show ip igmp snooping vlan 1
Global IGMP Snooping configuration:
-----------------------------------
IGMP snooping
IGMPv3 snooping (minimal) :Enabled
Report suppression
TCN solicit query
TCN flood query count
Vlan 1:
--------
IGMP snooping
Immediate leave
Multicast router learning mode
Source only learning age timer
CGMP interoperability mode
To return to the default learning method, use the no ip igmp snooping vlan vlan-id mrouter learn cgmp
global configuration command.
Configuring a Multicast Router Port
To add a multicast router port (add a static connection to a multicast router), use the ip igmp snooping
vlan mrouter global configuration command on the switch.
Static connections to multicast routers are supported only on switch ports.
Note
Beginning in privileged EXEC mode, follow these steps to enable a static connection to a multicast
router:
Command
Step 1
configure terminal
Step 2
ip igmp snooping vlan vlan-id mrouter
interface interface-id
Step 3
end
Step 4
show ip igmp snooping mrouter [vlan vlan-id] Verify that IGMP snooping is enabled on the VLAN interface.
Step 5
copy running-config startup-config
To remove a multicast router port from the VLAN, use the no ip igmp snooping vlan vlan-id mrouter
interface interface-id global configuration command.
78-16180-02
:Enabled
:Enabled
:Disabled
:2
:Enabled
:Disabled
:pim-dvmrp
:10
:IGMP_ONLY
Purpose
Enter global configuration mode.
Specify the multicast router VLAN ID and specify the interface
to the multicast router.
The VLAN ID range is 1 to 4094.
•
The interface can be a physical interface or a port channel.
•
The port channel range is 1 to 12.
Return to privileged EXEC mode.
(Optional) Save your entries in the configuration file.
Catalyst 3750 Switch Software Configuration Guide
Configuring IGMP Snooping
23-9
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