Cisco ME 3600X, Command Reference Manual

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Cisco ME 3800X and ME 3600X Switch Command Reference
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Chapter 2 Cisco ME 3800X and ME 3600X Switch Cisco IOS Commands
ip igmp snooping tcn flood
ip igmp snooping tcn flood
To specify multicast flooding as the Internet Group Management Protocol (IGMP) snooping
spanning-tree Topology Change Notification (TCN) behavior, use the
ip igmp snooping tcn flood
command in interface configuration mode. To disable the multicast flooding, use the no form of this
command.
ip igmp snooping tcn flood
no ip igmp snooping tcn flood
Syntax Description This command has no arguments or keywords.
Defaults Multicast flooding is enabled on an interface during a spanning-tree TCN event.
Command Modes Interface configuration
Command History
Usage Guidelines
When the switch receives a TCN, multicast traffic is flooded to all the ports until two general queries are
received. If the switch has many ports with attached hosts that are subscribed to different multicast
groups, this flooding behavior might not be desirable because the flooded traffic 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 count
global configuration command.
You can verify your settings by entering the show ip igmp snooping privileged EXEC command.
Examples
This example shows how to disable the multicast flooding on an interface:
Switch(config)# interface gigabitethernet0/2
Switch(config-if)# no ip igmp snooping tcn flood
Related Commands
Release Modification
12.2(52)EY This command was introduced.
Command Description
ip igmp snooping Enables IGMP snooping on the switch or on a VLAN.
ip igmp snooping tcn Configures the IGMP TCN behavior on the switch.
show ip igmp snooping Displays the IGMP snooping configuration of the switch or the VLAN.