System information

Configuring IP Multicast Routing
8-5
infinity indicates that the RP is always used.
Defining the PIM Domain Border
A border can be configured for the PIM domain, so that bootstrap messages do not
cross the border in either direction. Creating a border allows different Bootstrap
Routers (BSRs) to be elected on both sides of the PIM border.
Use the ip pim border command in Interface Configuration mode to configure a PIM
domain boundary on the interface of a border router peering with one or more
neighbors outside the PIM domain, as shown below:
MOT(config-if)#ip pim border
Configuring Candidate BSRs
One or more Bootstrap Routers (BSRs) can be configured to serve as candidates in a
PIM domain to avoid a single point of failure. Candidate BSRs should be configured
on the backbone portion of the network to help improve the efficiency of the multicast
network.
A BSR is elected among the candidate BSRs automatically by using bootstrap
messages to determine which BSR has the highest priority. This router then
announces to all PIM routers in the PIM domain that it is the BSR
.
Select from the following options to configure candidate BSRs:
• If you want to configure the router to be a candidate BSR with the default
hash-mask length of 30 bits for an RP selection, use the ip pim bsr-candidate
command in Interface Configuration mode, as shown below:
MOT(config-if)#ip pim bsr-candidate
• If the default hash mask is used for the candidate BSR, the router takes the first
rendezvous point (RP) address from the local RP-mapping cache.