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Chapter 5

IP Multicast in a WAN

IP Multicast WAN Configuration

Anycast RP

This section provides sample Anycast RP configurations for the routers shown in Figure 5-1.

Branch

The IP multicast configuration steps for the branch routers are as follows: Enable IP multicast routing. Enable IP PIM Sparse Mode on each interface that will receive and forward multicast traffic.

Identify the RP for the router. With Anycast RP, the address defined is the Loopback address that is duplicated on each participating Anycast RP router. (Loopback 1 - 10.6.2.1).

Following is the basic multicast configuration for “leftrtr.” This configuration is duplicated on each branch router.

ip multicast-routing ! interface FastEthernet0/0.20

Enable IP multicast routing globally.

PIM-SM on the interface.

description dot1q trunk interface for DATA VLAN ip pim sparse-mode ! interface FastEthernet0/0.120

description dot1q trunk interface for VOICE VLAN ip pim sparse-mode ! interface Serial0/0.1 point-to-point

description To wanaggright ip pim sparse-mode ! interface Serial0/0.2 point-to-point

description To wanaggleft ip pim sparse-mode ! ip pim rp-address 10.6.2.1 !

Loopback 1 address of both WAN aggregation routers.

WAN Aggregation

The IP multicast configuration steps for the WAN aggregation routers are as follows: Enable IP multicast routing. Enable IP PIM Sparse Mode on each interface that will receive and forward multicast traffic.

Identify the RP for the router. With Anycast RP, the address defined is the Loopback address that is duplicated on each participating Anycast RP router. (Loopback 1 - 10.6.2.1).

Note

Multicast Distributed Fast Switching (MDFS) is not supported on any type of virtual interface, such as virtual-template or multilink interfaces. Enabling ip mroute-cache distributed on unsupported interfaces can result in process switching of the multicast packets or dropped packets.

Cisco AVVID Network Infrastructure IP Multicast Design

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