Specifications

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Appendix B Cisco MWR 2941 Router Command Reference

ip igmp query-interval

Note We recommend that you do not change the default IGMP query interval.

To configure the frequency at which the IGMP querier sends Internet Group Management Protocol

(IGMP) host-query messages from an interface, use the ip igmp query-interval command in interface

configuration mode. To restore the default IGMP query interval, use the no form of this command.

ip igmp query-interval seconds

no ip igmp query-interval

Syntax Description

Command Default The default IGMP query interval is 60 seconds.

Command Modes Interface configuration (config-if)

Command History

Usage Guidelines Use the ip igmp query-interval command to configure the frequency at which the IGMP querier sends

IGMP host-query messages from an interface. The IGMP querier sends query-host messages to discover

which multicast groups have members on the attached networks of the router.

Note We recommend that you use the default IGMP query interval and timeout period.

The Cisco IOS software uses a default IGMP query interval of 60 seconds, which is different from the

RFC standard default of 125 seconds. Using a lower default IGMP query interval of 60 seconds allows

routers to stop forwarding traffic faster when a member crashes without sending leaves (in IGMPv2 or

IGMPv3 environment), or if using IGMPv1: 3 * 60 seconds versus 3 * 125 seconds.

seconds Frequency, in seconds, at which the router sends IGMP query messages from

the interface. The range is from 1 to 18000. The default is 60.

Release Modification

10.2 This command was introduced.

12.2(33)SRA This command was integrated into Cisco IOS Release 12.2(33)SRA.

12.2SX This command is supported in the Cisco IOS Release 12.2SX train. Support in

a specific 12.2SX release of this train depends on your feature set, platform,

and platform hardware.

12.2(33)MRB This command was integrated into Cisco IOS Release 12.2(33)MRB.