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Catalyst 2950 and Catalyst 2955 Switch Command Reference
OL-10102-01
Chapter 2 Catalyst 2950 and 2955 Cisco IOS Commands
ip igmp max-groups
ip igmp max-groups
Use the ip igmp max-groups interface configuration command 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 no form of this
command 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.
ip igmp max-groups {number | action {deny | replace}}
no ip igmp max-groups {number | action}
Syntax Description
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
Usage Guidelines You can use this command only on Layer 2 physical interfaces and on logical EtherChannel interfaces.
You cannot set IGMP maximum groups or configure the IGMP throttling action for 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 and the maximum number of entries is in the forwarding table, the switch drops the next
IGMP report received on the interface.
number The maximum number of IGMP groups that an interface can join. The
range is 0 to 4294967294. The default is no limit.
action {deny | replace} Set the throttling action. The keywords have these meanings:
• deny—When the maximum number of entries is in the IGMP snooping
forwarding table, drop the next IGMP join report. This is the default
action.
• replace—When the maximum number of entries is in the IGMP
snooping forwarding table, replace the existing group with the new
group for which the IGMP report was received.
Release Modification
12.1(9)EA1 This command was introduced.
12.1(19)EA1 The action {deny | replace} keywords were added.
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