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Configuring Unidirectional Link Routing
IGMP Proxy Configuration Task List
IPC-512
Cisco IOS IP Configuration Guide
Prerequisites
Before configuring IGMP Proxy, ensure that the following conditions exist:
• All routers on the UDL have the same subnet address. If all routers on the UDL cannot have the same
subnet address; the upstream router must be configured with secondary addresses to match all the
subnets that the downstream routers are attached to.
• PIM-SM is configured in the network, the UDL downstream router is the RP for a select set of
addresses, and mroute proxy is configured on interfaces leading to PIM-enabled networks with
potential members.
Configuring IGMP Proxy
To configure IGMP Proxy, use the following commands in interface configuration mode:
See the “IGMP Proxy Example” section later in this chapter for an example of how to configure IGMP
Proxy. 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.
Verifying IGMP Proxy
To verify that IGMP Proxy is configured properly, use the show ip igmp interface EXEC command. The
following sample output shows that IGMP Proxy is configured on Ethernet interface 1/0/6.
router# show ip igmp udlr
IGMP UDLR Status, UDL Interfaces:Ethernet1/0/6
Group Address Interface UDL Reporter Reporter Expires
239.1.1.2 Ethernet1/0/6 10.10.0.3 00:02:59
239.1.1.1 Ethernet1/0/6 10.10.0.2 00:02:40
Command Purpose
Step 1
Router(config-if)# ip igmp mroute-proxy
type number
When used with the ip igmp proxy-service command, enables
forwarding of IGMP reports to a proxy service interface for all
(*, G) forwarding entries for this interface in the multicast
forwarding table.
Step 2
Router(config-if)# ip igmp proxy-service
Enables the mroute proxy service. Based on the IGMP query
interval, the router periodically checks the mroute table for
(*, G) forwarding entries that match interfaces configured with
the ip igmp mroute-proxy command. Where there is a match,
one IGMP report is created and received on this interface. This
command was intended to be used with the ip igmp
helper-address udl command, in which case the IGMP report
would be forwarded to an upstream router.