CANOGA PERKINS CanogaOS Configuration Guide - Manual (Page 186)

CanogaOS Configuration Guide
Proprietary & Confidential Canoga Perkins Metro Ethernet Switches Page 186 of 350
RP details
To display information about the RP router for a particular group, use the following command.
This output displays that 172.16.1.2 has been chosen as the RP for the multicast group 224.0.1.3.
Router_D# show ip pim sparse-mode rp-hash 224.0.1.3
Group(s): 224.0.0.0/4
RP: 172.16.1.2
Info source: 172.16.1.2, via bootstrap
After RP information reaches all PIM routers in the domain, various state machines maintain all
routing states as the result of Join/Prune from group membership. To display information on
interface details and the multicast routing table, refer to the Configuring RP Statically section
above
24.4 Boostrap Router Configuration
Every PIM multicast group needs to be associated with the IP address of a Rendezvous Point
(RP). This address is used as the root of a group-specific distribution tree whose branches extend
to all nodes in the domain that want to receive traffic sent to the group. 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 report 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.