Cisco Systems 78-11741-02 manual Igmp Proxy Configuration Task List, Monitoring Igmp Udlr, IPC-511

Configuring Unidirectional Link Routing

IGMP Proxy Configuration Task List

See the “IGMP UDLR Example” section later in this chapter for an example of how to configure IGMP UDLR. See the “Integrated UDLR Tunnel, IGMP UDLR, and IGMP Proxy Example” section later in this chapter for an example of how to set up all three UDLR mechanisms in the same configuration.

Changing the Distance for the Default RPF Interface

By default, the distance for the default Reverse Path Forwarding (RPF) interface is 15. Any explicit sources learned by routing protocols will take preference if their distance is less than the distance configured by the ip multicast default-rpf-distanceglobal configuration command.

If you want IGMP to prefer the UDLR link, set the distance to be less than the distances of the unicast routing protocols. If you want IGMP to prefer the non-UDLR link, set the distance to be greater than the distances of the unicast routing protocols. This task might be required on downstream routers if you want some sources to use RPF to reach the UDLR link and others to use the terrestrial paths.

To change the distance for the default RPF interface, use the following command in global configuration mode:

Command	Purpose
Router(config)# ip multicast default-rpf-distance	Changes the distance for the default RPF interface.
distance

Monitoring IGMP UDLR

To display UDLR information for directly connected groups on interfaces that have a UDL helper address configured, use the following command in EXEC mode:

Command	Purpose
Router# show ip igmp udlr [group-name	Displays UDLR information for directly connected multicast
group-address type number]	groups on interfaces that have a UDL helper address configured.

IGMP Proxy Configuration Task List

To configure IGMP Proxy, perform the tasks described in the following sections. The tasks in the first section are required; the tasks in the remaining section are optional.

•Configuring IGMP Proxy (Required)

•Verifying IGMP Proxy (Optional)

Cisco IOS IP Configuration Guide

IPC-511