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Configuring Unidirectional Link Routing
IGMP Proxy Configuration Task List
IPC-511
Cisco IOS IP Configuration Guide
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-distance global 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:
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:
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)
Command Purpose
Router(config)# ip multicast default-rpf-distance
distance
Changes the distance for the default RPF interface.
Command Purpose
Router# show ip igmp udlr [group-name |
group-address | type number]
Displays UDLR information for directly connected multicast
groups on interfaces that have a UDL helper address configured.