IGMP UDLR Commands
                          ------------------
  Global commands:
   
    [no] ip multicast default-rpf-distance <distance>
        Configures the distance given to the default RPF interface. The default
        RPF interface is selected when an IGMP query is received on a 
        unidirectional link and indicates to the router all sources will RPF
        to the unidirectional interface. Any explicit sources learned by 
        routing protocols will take preference as long as their distance is
        less than <distance>. The default for this command is 15.

  Interface subcommands:

    [no] ip igmp unidirectional-link
        Configures an interface which is unidirectional and enables it for IGMP
	unidirectional link multicast routing. This is configured on routers
        with both uplink and downlink connections to satellite interfaces.

    [no] ip igmp helper-address udl <interface>
        If an IGMP report is recceive on an interface with this helper address,
        then the report is forwarded to the IGMP querier associated with UDL
	interface  <interface>.

  Show commands:

    show ip igmp udlr [<group-name> | <group-address>] | [<interface-unit>]
        Displays UDLR information for directly connected groups on interfaces
	which have UDL helper addresses configured.










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