Configuration Guide
290
Configuring Layer 2 Multicast
IGMP Snooping Configurations
Step 4
ip igmp snooping max-groups action {
drop | replace
}
Specify the action towards the new multicast group when the number of multicast groups the
port joined exceeds max group.
drop:
Drop all subsequent membership report messages, and the port join no more new
multicast groups.
replace:
Replace the existing multicast group with the lowest multicast MAC address with the
new multicast group.
Step 5
show ip igmp snooping interface [fastEthernet [
port | port-list
]
|
gigabitEthernet [
port |
port-list
]] max-groups
Show the IGMP group limitation on the specified port(s) or of all the ports.
Step 6
end
Return to privileged EXEC mode.
Step 7
copy running-config startup-config
Save the settings in the configuration file.
The following example shows how to configure the Max Group as 500 and the Overflow
Action as Drop on port 1/0/3:
Switch#configure
Switch(config)#ip igmp snooping
Switch(config)#interface gigabitEternet
1/0/3
Switch(config-if)#ip igmp snooping
Switch(config-if)#ip igmp snooping max-groups
500
Switch(config-if)#ip igmp snooping max-groups action drop
Switch(config-if)#show ip igmp snooping interface gigabitEthernet
1/0/3
max-groups
Port Max-Groups Overflow-Action
---- ------------- ----------
Gi1/0/3
500
Drop
Switch(config-if)#end
Switch#copy running-config startup-config
2.2.5 Configuring IGMP Snooping Last Listener Query
Step 1
configure
Enter global configuration mode.
