Cisco Catalyst 3560X-24P Command Reference Manual page 290

ip igmp max-groups
Follow these guidelines when configuring the IGMP throttling action:
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Examples 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 replace the existing group with the new group for
which the IGMP report was received 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 Command
show running-config interface
interface-id
Catalyst 3750-X and 3560-X Switch Command Reference
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If you configure the throttling action as deny and set the maximum group limitation, the entries that
were previously in the forwarding table are not removed but are aged out. After these entries are
aged out, when the maximum number of entries is in the forwarding table, the switch drops the next
IGMP report received on the interface.
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 replaces a randomly selected multicast entry with the received
IGMP report.
When the maximum group limitation is set to the default (no maximum), entering the ip igmp
max-groups {deny | replace} command has no effect.
Chapter 2 Catalyst 3750-X and 3560-X Switch Cisco IOS Commands
Description
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
Commands.
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