Cisco IOS Cookbook, 2nd Edition

Routing Multicast Traffic with PIM-SM and Auto-RP

Problem

You want to allow routing of multicasts by using Sparse Mode, and use Auto-RP for distributing RP information.

Solution

This recipe accomplishes the same basic tasks as Recipe 23.2, but using a different method. If you are unfamiliar with PIM-SM, please read that recipe first. There are two different types of router configurations for Auto-RP configuration, just as there are for BSR. Router1 represents a regular multicast-enabled router anywhere in the network. This router supports end devices as group members or servers, as well as routing multicast traffic for other routers:

Router1#configure terminal 
Enter configuration commands, one per line.  End with CNTL/Z.
Router1(config)#ip multicast-routing
Router1(config)#ip pim rp-address 192.168.15.5
Router1(config)#interface FastEthernet0/0
Router1(config-if)#ip address 192.168.1.1 255.255.255.0
Router1(config-if)#ip pim sparse-dense-mode
Router1(config-if)#exit
Router1(config)#interface Serial1/0
Router1(config-if)#ip address 192.168.2.5 255.255.255.252
Router1(config-if)#ip pim sparse-dense-mode
Router1(config-if)#end
Router1#

The second type of configuration is for a candidate RP router, called Router RP1. This router may also support group members or servers. As in the previous recipe, it is a good idea to configure two or more routers in each multicast domain like this to provide redundancy:

Router-RP1#configure terminal  Enter configuration commands, one per line. End with CNTL/Z. ...