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Chapter 20
Configuring IGMP Snooping and MVR
Beginning in privileged EXEC mode, follow these steps to configure the throttling action when the
maximum number of entries is in the forwarding table:
Command
Step 1
configure terminal
Step 2
interface interface-id
Step 3
no shutdown
Step 4
ip igmp max-groups action {deny |
replace}
Step 5
end
Step 6
show running-config interface
interface-id
Step 7
copy running-config startup-config
To return to the default action of dropping the report, use the no ip igmp max-groups action interface
configuration command.
This example shows how to configure a port to remove a randomly selected multicast entry in the
forwarding table and to add an IGMP group to the forwarding table when the maximum number of
entries is in the table.
Switch(config)# interface gigabitethernet0/1
Switch(config-if)# ip igmp max-groups action replace
Switch(config-if)# end
78-17058-01
To prevent the switch from removing the forwarding-table entries, you can configure the IGMP
throttling action before an interface adds entries to the forwarding table.
Purpose
Enter global configuration mode.
Specify the physical interface to be configured, and enter interface
configuration mode. The interface can be a Layer 2 port that does not
belong to an EtherChannel group or an EtherChannel interface. The
interface cannot be a trunk port.
Enable the port, if necessary. By default, UNIs are disabled, and NNIs
are enabled.
When an interface receives an IGMP report and the maximum number
of entries is in the forwarding table, specify the action that the interface
takes:
deny—Drop the report.
•
•
replace—Replace the existing group with the new group for which
the IGMP report was received.
Return to privileged EXEC mode.
Verify the configuration.
(Optional) Save your entries in the configuration file.
Cisco ME 3400 Ethernet Access Switch Software Configuration Guide
Configuring IGMP Filtering and Throttling
20-27
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