Cisco Systems 78-11741-02 manual Configuring Igmp Proxy, Verifying Igmp Proxy, IPC-512

Configuring Unidirectional Link Routing

IGMP Proxy Configuration Task List

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:

	Command	Purpose
Step 1
	Router(config-if)#ip igmp mroute-proxy	When used with the ip igmp proxy-servicecommand, enables
	type number	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-proxycommand. 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.

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

Cisco IOS IP Configuration Guide

IPC-512