Cisco Catalyst 3750-X Command Reference

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Catalyst 3750-X and 3560-X Switch Command Reference
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Chapter 2 Catalyst 3750-X and 3560-X Switch Cisco IOS Commands
ip igmp max-groups
ip igmp max-groups
Use the ip igmp max-groups interface configuration command on the switch stack or on a standalone
switch 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 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 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 When the maximum number of entries is in the IGMP snooping forwarding table, drop
the next IGMP join report. This is the default action.
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
12.2(53)SE2 This command was introduced.

Cisco Catalyst 3750-X Specifications

General

Switching Capacity	160 Gbps
Stacking Bandwidth	64 Gbps
Max Stacking Units	9
Layer Support	Layer 2 and Layer 3
Form Factor	Rack-mountable
DRAM	256 MB
Flash Memory	64 MB
Model	Cisco Catalyst 3750-X Series
Ports	24 or 48 10/100/1000 Ethernet ports
Uplink Interfaces	4 SFP or 2 SFP+
Features	StackWise Plus, EnergyWise
Image	IP Base or IP Services
Operating Temperature	0 to 40°C
Operating Humidity	10 to 85% noncondensing