Configuring an Auto-RP Router for PIM Sparse-Dense Mode

In PIM sparse-dense mode, you must prevent routers from advertising auto-RP messages to the multicast groups 224.0.1.39 and 224.0.1.40, which are reserved for forwarding auto-RP messages through the network. To configure an auto-RP router for PIM sparse-dense mode:

1. Assign an RP mapping agent.

   host1(config)#ip pim send-rp-discovery scope 23 loopback 1

2. Configure an access list that details the multicast groups that can use the static RP router.

   host1(config)access-list boston permit 224.0.0.0 15.255.255.255

3. Prevent routers from advertising auto-RP messages to the multicast groups that are reserved for forwarding auto-RP messages through the network.

   host1(config)#access-list 1 deny 224.0.1.39

   host1(config)#access-list 1 deny 224.0.1.40

4. Configure routers to send auto-RP announcement messages to the mapping agent.

   host1(config)#ip pim send-rp-announce loopback 2 scope 23 group-list boston interval 200

ip pim rp-address

• Use to specify a static PIM RP router.
• Specify a standard IP access list of multicast groups to control which multicast groups can use this RP router.
• Specify the override keyword if you want this static RP router to have priority over auto-RP routers.
• Example

  host1(config)#ip pim rp-address 192.48.1.22 11 override

• Use the no version to clear the filter from this interface.
• See ip pim rp-address.

ip pim send-rp-announce

• Use to send auto-RP announcement messages from a router you configured as an RP.
• Specify an interface type and specifier, such as atm 3/0. For details about interface types and specifiers, see Interface Types and Specifiers in JUNOSe Command Reference Guide.
• The auto-RP announcement messages contain the IP address for the interface that you specify.
• Specify the number of hops for which the announcement is valid; default value is 64.
• Specify an access list that details which multicast groups the RP can include in announcement messages.
• Specify a time interval in the range 1–65535 seconds to control how often the router sends announcements. The default is 60 seconds.
• Example

  host1(config)#ip pim send-rp-announce loopback 2 scope 23 group-list boston interval 200

• Use the no version to clear filters from this interface.
• See ip pim send-rp-announce.

ip pim send-rp-discovery scope

• Use to configure the router as an RP mapping agent, which records group-to-RP mappings and notifies PIM designated routers about the mappings.
• Specify the number of hops for which the RP discovery message is valid; default value is 64.
• To assign an interface from which the router sends auto-RP discovery messages, specify an interface type and specifier, such as atm 3/0. For details about interface types and specifiers, see Interface Types and Specifiers in JUNOSe Command Reference Guide.
• Example

  host1(config)#ip pim send-rp-discovery scope 23 loopback 1

• Use the no version to stop the router from acting as an RP mapping agent.
• See ip pim send-rp-discovery scope.

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