Ip Igmp Max-Groups - Cisco ME 3800X Command Reference Manual

ip igmp max-groups

ip igmp max-groups
To set the maximum number of Internet Group Management Protocol (IGMP) groups that a Layer 2
interface can join, or to configure the IGMP throttling action when the maximum number of entries is in
the forwarding table, use the ip igmp max-groups command in interface configuration mode. To set the
maximum back to the default, which is to have no maximum limit, or to return to the default throttling
action, which is to drop the report, use the no form of this command.
Syntax Description number
action deny
action
replace
Defaults The default maximum number of groups is no limit.
After the switch learns the maximum number of IGMP group entries on an interface, the default
throttling action is to drop the next IGMP report that the interface receives and to not add an entry for
the IGMP group to the interface.
Command Modes Interface configuration
Command History Release
12.2(52)EY
Usage Guidelines You can use this command only on Layer 2 physical interfaces and on logical EtherChannel interfaces.
You cannot set IGMP maximum groups for routed ports, switch virtual interfaces (SVIs), or ports that
belong to an EtherChannel group.
Follow these guidelines when configuring the IGMP throttling action:
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Cisco ME 3800X and ME 3600X Switch Command Reference
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ip igmp max-groups {number | action {deny | replace}}
no ip igmp max-groups {number | action}
The maximum number of IGMP groups that an interface can join. The range is 0 to
4294967294. The default is no limit.
When the maximum number of entries is in the IGMP snooping forwarding table, drops
the next IGMP join report. This is the default action.
When the maximum number of entries is in the IGMP snooping forwarding table,
replaces the existing group with the new group for which the ICMP report was received.
Modification
This command was introduced.
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.
Chapter 2 Cisco ME 3800X and ME 3600X Switch Cisco IOS Commands
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