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Configuring an Auto-RP Router for PIM Sparse Mode

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:

  1. Configure a static RP to have priority over the auto-RP for the groups that send auto-RP multicast messages.
    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
  2. Assign an RP mapping agent.
    host1(config)#ip pim send-rp-discovery scope 23 loopback 1
  3. Configure routers to send auto-RP announcement messages to the mapping agent.
    host1(config)#ip pim send-rp-announce loopback 2 scope 16 group-list 1

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