Cisco Systems 3750E Configuring a Host Statically to Join a Group, Enabling Igmp Immediate Leave

Chapter 24 Configuring IGMP Snooping and MVR

Configuring IGMP Snooping

Configuring a Host Statically to Join a Group

Hosts or Layer 2 ports normally join multicast groups dynamically, but you can also statically configure a host on an interface.

Beginning in privileged EXEC mode, follow these steps to add a Layer 2 port as a member of a multicast group:

	Command	Purpose
Step 1
	configure terminal	Enter global configuration mode.
Step 2 ip igmp snooping vlan vlan-idstatic ip_address		Statically configure a Layer 2 port as a member of a multicast
	interface interface-id	group:
		• vlan-idis the multicast group VLAN ID. The range is 1 to
		1001 and 1006 to 4094.
		• ip-addressis the group IP address.
		• interface-idis the member port. It can be a physical
		interface or a port channel (1 to 48).
Step 3
	end	Return to privileged EXEC mode.
Step 4
	show ip igmp snooping groups	Verify the member port and the IP address.
Step 5
	copy running-config startup-config	(Optional) Save your entries in the configuration file.

To remove the Layer 2 port from the multicast group, use the no ip igmp snooping vlan vlan-idstatic mac-addressinterface interface-idglobal configuration command.

This example shows how to statically configure a host on a port:

Switch# configure terminal

Switch(config)# ip igmp snooping vlan 105 static 224.2.4.12 interface gigabitethernet1/0/1

Switch(config)# end

Enabling IGMP Immediate Leave

When you enable IGMP Immediate Leave, the switch immediately removes a port when it detects an IGMP Version 2 leave message on that port. You should only use the Immediate-Leave feature when there is a single receiver present on every port in the VLAN.

Note Immediate Leave is supported only on IGMP Version 2 hosts.

Beginning in privileged EXEC mode, follow these steps to enable IGMP Immediate Leave:

	Command	Purpose
Step 1
	configure terminal	Enter global configuration mode.
Step 2
	ip igmp snooping vlan vlan-id	Enable IGMP Immediate Leave on the VLAN interface.
	immediate-leave
Step 3
	end	Return to privileged EXEC mode.

	Catalyst 3750-E and 3560-E Switch Software Configuration Guide
OL-9775-02		24-11