HP 6125XLG Configuration Manual page 72

BSR encapsulates the RP-set information in the bootstrap messages (BSMs) and floods the BSMs to the
entire PIM-SM domain.
Figure 27 Information exchange between C-RPs and BSR
Based on the information in the RP-sets, all routers in the network can select the proper RP for a specific
multicast group based on the following rules:
1. The C-RP that is designated to the smallest multicast group range wins.
2. If all the C-RPs are designated to the same multicast group range, the C-RP with the highest priority
wins.
3. If all the C-RPs are designated to the same multicast group range and have the same priority, the
C-RP with the largest hash value (calculated through the hashing algorithm) wins.
4. If all the C-RPs are designated to the same multicast group range and have the same priority and
hash value, the C-RP that has the highest IP address wins.
RPT building
Figure 28 RPT building in a PIM-SM domain
Source
Server
RP
RPT
Join message
Multicast packets
DR
65
Host A
Receiver
DR
Host B
Receiver
Host C