CANOGA PERKINS 9175 Configuration Guide - Manual (Page 153)

CanogaOS Configuration Guide
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For all senders to reach all receivers, all routers in the domain use the same mappings of
group addresses to RP addresses. In order to determine the RP for a multicast group, a
PIM router maintains a collection of group-to-RP mappings, called the RP-Set.
The Bootstrap Router (BSR) mechanism for the class of multicast routing protocols in the
PIM domain use the concept of a Rendezvous Point as a means for receivers to discover
the sources that send to a particular multicast group. The BSR mechanism is one way
that a multicast router can learn the set of group-to-RP mappings required in order to
function.
24.4.1 Configuring BSR
Some of the PIM routers within a PIM domain are configured as Candidate-RPs (C-RPs).
A subset of the C-RPs will eventually be used as the actual RPs for the domain. An RP
configured with a lower value in the priority field has higher a priority.
Some of the PIM routers in the domain are configured to be Candidate-BSRs (C-BSRs).
One of these C-BSRs is elected to be the bootstrap router (BSR) for the domain, and all
PIM routers in the domain learn the result of this election through BSM (Bootstrap
messages). The C-BSR with highest value in priority field is Elected-BSR.
The C-RPs then reports their candidacy to the elected BSR, which chooses a subset of
the C-RPs and distributes corresponding group-to-RP mappings to all the routers in the
domain through Bootstrap messages.
24.4.2 Topology
Figure 24-1: BSR Topology
24.4.3 Configurations
Router 1
DUT1>enable Enter Privilege Exec mode
DUT1#configure terminal Enter Configuration mode
DUT1(config)# ip pim bsr-candidate eth-0-1 Configure eth-0-1 of rtr1 as C-BSR. The
default priority is 64.
Router 2
DUT2>enable Enter Privilege Exec mode
DUT2#configure terminal Enter Configuration mode
Router 1 Router 2 Eth-0-1 Eth-0-1
Eth-0-2 Eth-0-2