C
HAPTER
38
| Multicast Filtering Commands
IGMP Filtering and Throttling
– 1221 –
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: 1-1023)
DEFAULT SETTING
1023
COMMAND MODE
Interface Configuration (Ethernet)
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.” 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.
EXAMPLE
Console(config)#interface ethernet 1/1
Console(config-if)#ip igmp max-groups 10
Console(config-if)#
ip igmp max-groups
action
This command sets the IGMP throttling action for an interface on the
switch.
SYNTAX
ip igmp max-groups action {deny | replace}
deny - The new multicast group join report is dropped.
replace - The new multicast group replaces an existing group.
DEFAULT SETTING
Deny
COMMAND MODE
Interface Configuration (Ethernet)
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