HP 5920 series Configuration Manual page 72

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-set, all routers in the network can select the proper RP for a specific
multicast group based on the following rules:
The C-RP with the highest priority wins.
1.
If all the C-RPs have the same priority, the C-RP with the largest hash value (calculated through the
2.
hash algorithm) wins.
If all the C-RPs have the same priority and hash value, the C-RP with the highest IP address wins.
3.
RPT building
Figure 28 RPT building in a PIM-SM domain
Source
Server
As shown in
When a receiver wants to join the multicast group G, it uses an IGMP message to inform the
1.
receiver-side DR.
RP
RPT
Join message
Multicast packets
Figure 28, the process of building an RPT is as follows:
DR
65
Host A
Receiver
DR
Host B
Receiver
Host C