Two multicast groups, 224.0.1.39 and 224.0.1.40, are reserved for forwarding auto-RP messages through the network. When you configure an auto-RP router for PIM sparse mode, you must assign a static RP router to these two groups. You can then specify an RP mapping agent for other multicast groups.
To configure an auto-RP router for PIM sparse mode:
- host1(config)#access-list 11 permit 224.0.1.39
0.0.0.0
- host1(config)#access-list 11 permit 224.0.1.40
0.0.0.0
- host1(config)#ip pim rp-address 192.48.1.22 11 override
- host1(config)#ip pim send-rp-discovery scope
23 loopback 1
- host1(config)#ip pim send-rp-announce loopback
2 scope 16 group-list 1