•
This restriction can be applied only to Layer 2 ports. You can use this command on a logical EtherChannel
interface but cannot use it on ports that belong to an EtherChannel port group.
•
When the maximum group limitation is set to the default (no maximum), entering the
ip igmp max-groups
action
{
deny
|
replace
} command has no effect.
•
If you configure the throttling action and set the maximum group limitation after an interface has added
multicast entries to the forwarding table, the forwarding-table entries are either aged out or removed,
depending on the throttling action.
◦
If you configure the throttling action as
deny
, 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.
◦
If you configure the throttling action as
replace
, 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.
SUMMARY STEPS
1.
enable
2.
configure terminal
3.
interface interface-id
4.
ip igmp max-groups action
{
deny
|
replace
}
5.
end
6.
show running-config interface interface-id
7.
copy running-config startup-config
DETAILED STEPS
Purpose
Command or Action
Enables privileged EXEC mode.
enable
Step 1
Example:
Device>
enable
•
Enter your password if prompted.
Enters the global configuration mode.
configure terminal
Example:
Device#
configure terminal
Step 2
IP Multicast Routing Configuration Guide, Cisco IOS XE Release 3SE (Catalyst 3650 Switches)
OL-29890-01
51
Configuring IGMP
Configuring the IGMP Throttling Action (CLI)
