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PIM Sparse Mode Bootstrap Router

PIM sparse mode routers need the address of the rendezvous point (RP) for each group for which they have (*,G) state. They obtain this address either through a bootstrap mechanism or through static configuration. Two bootstrap mechanisms exist—bootstrap router (BSR) or auto-RP. Auto-RP is not used in IPv6 implementations.

When implemented, BSR operates as follows:

  1. One router in each PIM domain is elected the BSR.
  2. All the routers in the domain that are configured to be RP candidates periodically unicast their candidacy to the BSR.
  3. The BSR picks an RP set from the available candidates and periodically announces this set in a bootstrap message.
  4. Bootstrap messages are flooded hop by hop throughout the domain until all routers in the domain learn the RP Set.
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