Auto-RP Configuration

Auto-RP Configuration

For Auto-RP, the RPs and a mapping agent need to be configured. The RPs are configured using the Global Configuration command:

ip pim send-rp-announce interface-type interface-number scope ttl

group-list access-list-number

interface-type interface-number

The address of the specified interface is used to identify the RP.

scope

TTL value of the announcements. Limits the distance an RP announcement can travel.

access-list-number

An access-list determines the groups that the RP is announcing that it can service.

The router sends RP announcements on all PIM-enabled interfaces for a maximum number of hops specified by the scope parameter. The announcements are sent to the group CISCO-RP-ANNOUNCE (224.0.1.39). To enable the RP to announce all multicast groups, use the command below.

ip pim send-rp-announce ethernet 0 scope 30 group-list 2

access-list 2 permit 224.0.0.0 15.255.255.255

The next step in configuring Auto-RP is to configure the RP mapping agent using the global command

ip pim send-rp-discovery scope ttl

TTL of the Discovery messages. Used to limit the scope of the message.

The router configured as a mapping agent will listen for RP announcements to group CISCO-RP-ANNOUNCE (224.0.1.39). The RP mapping agent then sends the RP-to-group mappings to the group CISCO-RP-DISCOVERY (224.0.1.40), and PIM routers get their RP information from the Discovery messages.