Cisco Catalyst 3750 Command Reference Manual page 172

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ip igmp max-groups

This example shows how to limit to 25 the number of IGMP groups that a port can join.

Switch(config)# interface gigabitethernet1/0/2

Switch(config-if)# ip igmp max-groups 25

This example shows how to configure the switch to delete a random IGMP group in the forwarding table

and to add an entry for the IGMP group when the maximum number of entries is in the forwarding table:

Switch(config)# interface gigabitethernet2/0/1

Switch(config-if)# ip igmp max-groups action replace

You can verify your setting by using the show running-config privileged EXEC command and by

specifying an interface.

Related Commands

show running-config interface

interface-id

Catalyst 3750 Switch Command Reference

If you configure the throttling action as replace and set the maximum group limitation, the entries

that were previously in the forwarding table are removed. When the maximum number of entries is

in the forwarding table, the switch deletes a randomly-selected entry and adds an entry for the next

IGMP report received on the interface.

When the maximum group limitation is set to the default (no maximum), entering the ip igmp

max-groups {deny | replace} command has no effect.

Displays the running configuration on the switch interface, including

the maximum number of IGMP groups that an interface can join and

the throttling action. For syntax information, select Cisco IOS

Configuration Fundamentals Command Reference, Release 12.2 >

File Management Commands > Configuration File Management

Catalyst 3750 Switch Cisco IOS Commands