Chapter 21
| Multicast Filtering Commands
IGMP Filtering and Throttling
– 523 –
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
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.
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, Port Channel)
