Catalyst 3750-E and 3560-E Switch Cisco IOS ... - DNIP . NET

ip igmp snooping tcn floodChapter 2Catalyst 3750-E and 3560-E Switch Cisco IOS Commandsip igmp snooping tcn floodUse the ip igmp snooping tcn flood interface configuration command on the switch stack or on astandalone switch to specify multicast flooding as the Internet Group Management Protocol (IGMP)snooping spanning-tree Topology Change Notification (TCN) behavior. Use the no form of thiscommand to disable the multicast flooding.ip igmp snooping tcn floodno ip igmp snooping tcn floodSyntax DescriptionThis command has no arguments or keywords.DefaultsMulticast flooding is enabled on an interface during a spanning-tree TCN event.Command ModesInterface configurationCommand HistoryRelease12.2(35)SE2ModificationThis command was introduced.Usage GuidelinesWhen the switch receives a TCN, multicast traffic is flooded to all the ports until two general queries arereceived. If the switch has many ports with attached hosts that are subscribed to different multicastgroups, the flooding might exceed the capacity of the link and cause packet loss.You can change the flooding query count by using the ip igmp snooping tcn flood query count countglobal configuration command.ExamplesThis example shows how to disable the multicast flooding on an interface:Switch(config)# interface gigabitethernet1/0/2Switch(config-if)# no ip igmp snooping tcn floodYou can verify your settings by entering the show ip igmp snooping privileged EXEC command.Related CommandsCommandip igmp snoopingip igmp snooping tcnshow ip igmp snoopingDescriptionEnables IGMP snooping on the switch or on a VLAN.Configures the IGMP TCN behavior on the switch.Displays the IGMP snooping configuration of the switch or the VLAN.2-264Catalyst 3750-E and 3560-E Switch Command ReferenceOL-9776-08