Enabling Igmp Immediate Leave; Configuring The Igmp Leave Timer - Cisco Catalyst 3750-X Software Configuration Manual

Configuring IGMP Snooping
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.
Immediate Leave is supported only on IGMP Version 2 hosts.
Note
Beginning in privileged EXEC mode, follow these steps to enable IGMP Immediate Leave:
Command
Step 1 configure terminal
Step 2
ip igmp snooping vlan vlan-id
immediate-leave
Step 3
end
Step 4
show ip igmp snooping vlan vlan-id
Step 5 copy running-config startup-config
To disable IGMP Immediate Leave on a VLAN, use the no ip igmp snooping vlan vlan-id
immediate-leave global configuration command.
This example shows how to enable IGMP Immediate Leave on VLAN 130:
Switch# configure terminal
Switch(config)# ip igmp snooping vlan 130 immediate-leave
Switch(config)# end

Configuring the IGMP Leave Timer

Follows these guidelines when configuring the IGMP leave timer:
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You can configure the leave time globally or on a per-VLAN basis.
Configuring the leave time on a VLAN overrides the global setting.
The default leave time is 1000 milliseconds.
The IGMP configurable leave time is only supported on hosts running IGMP Version 2.
The actual leave latency in the network is usually the configured leave time. However, the leave time
might vary around the configured time, depending on real-time CPU load conditions, network delays
and the amount of traffic sent through the interface.
Purpose
Enter global configuration mode.
Enable IGMP Immediate Leave on the VLAN interface.
Return to privileged EXEC mode.
Verify that Immediate Leave is enabled on the VLAN interface.
(Optional) Save your entries in the configuration file.
Chapter 26 Configuring IGMP Snooping and MVR
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