Cisco Catalyst 3650 Series, Command Reference Manual

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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 interface configuration command on the device stack or on a standalone
device. 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.
ip igmp max-groups { max number | action { deny | replace }}
no ip igmp max-groups { max number | action }
Syntax Description
The maximum number of IGMP groups that an interface can join. The range is
0 to 4294967294. The default is no limit. max number
Drops the next IGMP join report when the maximum number of entries is in the
IGMP snooping forwarding table. This is the default action. action deny
Replaces the existing group with the new group for which the IGMP report was
received when the maximum number of entries is in the IGMP snooping
forwarding table. action replace
Command Default
The default maximum number of groups is no limit.
After the device 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
Modification Release
This command was introduced. Cisco IOS XE 3.3SECisco IOS XE 3.3SE
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:
• 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 device drops the next IGMP
report received on the interface.
Command Reference, Cisco IOS XE Everest 16.5.1a (Catalyst 3650 Switches)
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ip igmp max-groups