CLI Reference Guide-R05

Chapter 22 | Multicast Filtering Commands
IGMP Filtering and Throttling
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Command Mode
Interface Configuration
Command Usage
◆ The IGMP filtering profile must first be created with the ip igmp profile
command before being able to assign it to an interface.
◆ Only one profile can be assigned to an interface.
◆ A profile can also be assigned to a trunk interface. When ports are configured as
trunk members, the trunk uses the filtering profile assigned to the first port
member in the trunk.
Example
Console(config)#interface ethernet 1/1
Console(config-if)#ip igmp filter 19
Console(config-if)#
ip igmp max-groups This command sets the IGMP throttling number for an interface on the switch. Use
the no form to restore the default setting.
Syntax
ip igmp max-groups number
no ip igmp max-groups
number - The maximum number of multicast groups an interface can join at
the same time. (Range: 1-1024)
Default Setting
1024
Command Mode
Interface Configuration (Ethernet, Port Channel)
Command Usage
◆ IGMP throttling sets a maximum number of multicast groups that a port can
join at the same time. When the maximum number of groups is reached on a
port, the switch can take one of two actions; either “deny” or “replace” (see the
ip igmp max-groups action command). If the action is set to deny, any new
IGMP join reports will be dropped. If the action is set to replace, the switch
randomly removes an existing group and replaces it with the new multicast
group.
◆ IGMP throttling can also be set on a trunk interface. When ports are configured
as trunk members, the trunk uses the throttling settings of the first port
member in the trunk.