White Papers

ip igmp snooping fast-leave
Enable IGMP snooping fast-leave for this VLAN.
Syntax
ip igmp snooping fast-leave
To disable IGMP snooping fast leave, use the no igmp snooping fast-leave command.
Defaults Not configured.
Command Modes INTERFACE VLAN — (conf-if-vl-n)
Supported Modes Programmable-Mux (PMUX)
Full–Switch
Command
History
Version Description
9.9(0.0) Introduced on the FN IOM.
9.4(0.0) Supported on the FN I/O Aggregator.
9.2(0.0) Introduced on the M I/O Aggregator.
Usage
Information
Queriers normally send some queries when a leave message is received prior to deleting a group from the
membership database. There may be situations when you require a fast deletion of a group. When you
enable IGMP fast leave processing, the switch removes an interface from the multicast group as soon as
it detects an IGMP version 2 leave message on the interface.
ip igmp snooping flood
This command controls the flooding behavior of unregistered multicast data packets. When flooding is disabled, unregistered
multicast data traffic is forwarded to only multicast router ports in a VLAN. If there is no multicast router port in a VLAN,
unregistered multicast data traffic is dropped.
Syntax
ip igmp snooping flood
To disable the flooding, use the no ip igmp snooping flood command.
Parameters Enabled
Command Modes CONFIGURATION
Supported Modes All Modes
Command
History
Version Description
9.9(0.0) Introduced on the FN IOM.
9.4(0.0) Supported on the FN I/O Aggregator.
8.3.17.0 Supported on the M I/O Aggregator.
ip igmp snooping last-member-query-interval
The last member query interval is the maximum response time inserted into Group-Specific queries sent in response to Group-
Leave messages.
Syntax
ip igmp snooping last-member-query-interval milliseconds
To return to the default value, use the no ip igmp snooping last-member-query-interval
command.
474 Internet Group Management Protocol (IGMP)