Configuring SSM dynamic learning and range group

Configure SSM dynamic learning and a range group to enable the IGMPv3 dynamic learning feature and to extend the default SSM range of 232/8 to include an IP multicast address. As new SSM channels are learned, the system displays them in the SSM channel table.

Before you begin

To define the range group, you must first disable PIM.

About this task

You can configure IGMP on a VRF instance the same way you configure the Global Router except that you must use VRF Router Configuration mode.

Procedure

Enter Global Configuration mode:

enable

configure terminal
Enable SSM dynamic learning:

ip igmp ssm dynamic-learning
Configure the range group:

ip igmp ssm group-range <A.B.C.D/X>

The system displays the following message:

Warning: Changing the SSM range will cause all spb-multicast and spb-pim-gw enabled interfaces to be internally bounced. Do you wish to continue? (y/n) ? (y/n)?

Enter y to continue.

Example

Define the SSM range group address (234.0.0.0) and mask (255.0.0.0). Enable dynamic learning from IGMPv3 reports.

Switch:1(config)#ip igmp ssm group-range 234.0.0.0/255.0.0.0

WARNING: Changing the SSM range will cause all spb-multicast and spb-pim-gw enabled interfaces to be internally bounced. Do you wish to continue? (y/n) ? (y/n)? y
Switch:1(config)#ip igmp ssm dynamic-learning

Variable definitions

Use the data in the following table to use the ip igmp ssm command.


Variable	Value
{A.B.C.D/X}	Defines the SSM range. The SSM range parameter extends the default SSM range of 232/8 to include an IP multicast address. You can configure existing applications without having to change their group configurations. This parameter specifies an IP multicast address within the range of 224.0.0.0 and 239.255.255.255. The default is 232.0.0.0. The address mask is the IP address mask of the multicast group. The default is 255.0.0.0.