IGMP Snooping Commands 199ExampleThe following example configures the host leave-time-out to 60 seconds.ip igmp snooping querier enableThe ip igmp snooping querier enable Interface Configuration mode command enables Internet GroupManagement Protocol (IGMP) querier on a specific VLAN. Use the no form of this command to disableIGMP querier on a VLAN interface.Syntax• ip igmp snooping querier enable• no ip igmp snooping querier enableDefault ConfigurationIGMP querier is disabled.Command ModeInterface Configuration (VLAN) mode.User Guidelines• IGMP snooping querier can be enabled on a VLAN only if IGMP snooping is enabled for that VLAN.No more then one switch can be configured as an IGMP Querier for a VLAN.When IGMP Snooping Querier is enabled, it starts after host-time-out/2 with no IGMP trafficdetected from a Multicast router.The IGMP Snooping Querier disables itself if it detects IGMP traffic from a Multicast router.It restarts itself after host-time-out/2.Following are the IGMP Snooping Querier parameters as function of the IGMP Snooping parameters:• QueryMaxResponseTime: host-time-out/15.• QueryInterval: host-time-out/ 3.ExampleThe following example enables IGMP querier on a specific VLAN.Console (config)# interface vlan 2Console (config-if)# ip igmp snooping leave-time-out 60Console (config)# ip igmp snooping querier enable5400_CLI.book Page 199 Wednesday, December 17, 2008 4:33 PM
