PurposeCommand or Action
Specifies the physical interface to be configured, and enters interface
configuration mode. The interface can be a Layer 2 port that does not belong
interface interface-id
Example:
Device(config)# interface
Step 3
to an EtherChannel group or an EtherChannel interface. The interface cannot
be a trunk port.
gigabitethernet 1/0/1
When an interface receives an IGMP report and the maximum number of
entries is in the forwarding table, specifies the action that the interface takes:
ip igmp max-groups action {deny |
replace}
Step 4
Example:
Device(config-if)# ip igmp
• deny—Drops the report. If you configure this throttling action, the
entries that were previously in the forwarding table are not removed
but are aged out. After these entries are aged out and the maximum
number of entries is in the forwarding table, the device drops the next
IGMP report received on the interface.
max-groups action replace
• replace—Replaces the existing group with the new group for which
the IGMP report was received. If you configure this throttling action,
the entries that were previously in the forwarding table are removed.
When the maximum number of entries is in the forwarding table, the
device replaces a randomly selected entry with the received IGMP
report.
To prevent the device from removing the forwarding-table entries, you can
configure the IGMP throttling action before an interface adds entries to the
forwarding table.
To return to the default action of dropping the report, use the no ip
igmp max-groups action interface configuration command.
Note
Returns to privileged EXEC mode.end
Example:
Device(config)# end
Step 5
Verifies your entries.show running-config interface
interface-id
Step 6
Example:
Device# show running-config
interface gigabitethernet1/0/1
(Optional) Saves your entries in the configuration file.copy running-config startup-config
Example:
Device# copy running-config
Step 7
startup-config
IP Multicast Routing Configuration Guide, Cisco IOS XE Release 3.6E (Catalyst 3850 Switches)
OL-32598-01 65
Configuring IGMP
Configuring the IGMP Throttling Action (CLI)
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