BSR Border

ip pim bsr-border 


Prevent send / receive BSR message on the interface. When this command is used, the BSR  domain will stop at the interface configured this command.

R1 ---- R2 -----R3

Before 
R3

R3#sh ip pim rp mapping
PIM Group-to-RP Mappings

Group(s) 224.0.0.0/4
  RP 1.1.1.1 (?), v2
    Info source: 1.1.1.1 (?), via bootstrap, priority 0, holdtime 150
         Uptime: 00:00:04, expires: 00:02:21
R3#

After 
R2
int f0/1
description To R3
ip pim bsr-border


R3

R3#sh ip pim rp mapping
PIM Group-to-RP Mappings

R3#

From the example above, after we put in the command ip pim bsr-border on the interface of R2 connecting to the R3, we no longer see the RP on the R3.