Cisco 7609 - Configuring the IGMP Query Interval; Enabling IGMP Fast-Leave Processing

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Cisco 7600 Series Router Cisco IOS Software Configuration Guide—12.1E
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Chapter 21 Configuring IGMP Snooping
Configuring IGMP Snooping
Configuring the IGMP Query Interval
You can configure the interval for which the switch waits after sending a group-specific query to
determine if hosts are still interested in a specific multicast group.
Note When both IGMP fast-leave processing and the IGMP query interval are configured, fast-leave
processing takes precedence.
To configure the interval for the IGMP queries sent by the switch, perform this task:
This example shows how to configure the IGMP query interval:
Router(config-if)# ip igmp snooping last-member-query-interval 200
Router(config-if)# exit
Router# show ip igmp interface vlan 200 | include last-member-query-interval
IGMP snooping last member query interval on this interface is 200 ms
Enabling IGMP Fast-Leave Processing
To enable IGMP fast-leave processing in a VLAN, perform this task:
This example shows how to enable IGMP fast-leave processing on the VLAN 200 interface and verify
the configuration:
Router# interface vlan 200
Router(config-if)# ip igmp snooping fast-leave
Configuring fast leave on vlan 200
Router(config-if)# end
Router# show ip igmp interface vlan 200 | include fast-leave
IGMP snooping fast-leave is enabled on this interface
Router(config-if)#
Command Purpose
Step 1
Router(config)# interface vlan vlan_ID
Selects a VLAN interface.
Step 2
Router(config-if)# ip igmp snooping
last-member-query-interval interval
Configures the interval for the IGMP queries sent by the
switch. Default is 1 second. Valid range is 100 to 999
milliseconds.
Router(config-if)# no ip igmp snooping
last-member-query-interval
Reverts to the default value.
Command Purpose
Step 1
Router(config)# interface vlan vlan_ID
Selects a VLAN interface.
Step 2
Router(config-if)# ip igmp snooping fast-leave
Enables IGMP fast-leave processing in the VLAN.
Router(config-if)# no ip igmp snooping fast-leave
Disables IGMP fast-leave processing in the VLAN.