Administrative Distance, Access Lists, Route Manipulation, and IP Multicast - CCIE Routing and Switching Exam Certification Guide - page 497

IP address of all the candidate-RPs. The RP mapping agents then send RP-discovery messages
to the rest of the PIM-SM routers in the internetwork, with the selected RP to group mappings.
The configuration of a router as the RP and RP mapping agent is shown in Example 10-21.
Candidate RPs are configured with the ip pim send-rp-announce command. Mapping agents
are configured with the ip pim send-rp-discovery command.
Example 10-21 Configuration of the RP in PIM-SM
ip multicast-routing
ip pim send-rp-announce ethernet0 scope 3
ip pim send-rp-discovery scope 3
!
interface ethernet 0
ip address x
ip pim sparse-dense-mode
!
interface ethernet 1
ip address y
ip pim sparse-dense-mode
All other routers use the simple configuration, as shown in Example 10-22.
Example 10-22 Configuration of Non-RP Routers
ip multicast-routing
!
interface ethernet 0
ip address x
ip pim sparse-dense-mode
!
interface ethernet 1
ip address y
ip pim sparse-dense-mode
PIMv2 Bootstrap Router (BSR)
Instead of Auto-RP, a PIMv2 Bootstrap Router (BSR) can be configured to automatically select
an RP for the network. BSR is described in the RFC for PIM version 2, RFC 2362. With BSR,
you configure BSR candidates (C-BSRs) with priorities from 0 to 255 and a BSR address. C-BSRs
exchange bootstrap messages. Bootstrap messages are sent to multicast IP 224.0.0.13 (All PIM
routers). If a C-BSR receives a bootstrap message, it compares it with its own. The largest
priority C-BSR is selected as the BSR.
Candidate BSRs are configured with the following command:
ip pim bsr-candidate interface hash-mask-len pref