HP 6125XLG Ip Multicast Configuration Manual page 97

Figure 35 Information exchange between C-RPs and BSR
Based on the information in the RP-set, all routers in the network can select an RP for a specific multicast
group based on the following rules:
1. The C-RP that is designated to a smallest group range wins.
2. If the C-RPs are designated to the same group range, the C-RP with the highest priority wins.
3. If the C-RPs have the same priority, the C-RP with the largest hash value wins. The hash value is
calculated through the hash algorithm.
4. If the C-RPs have the same hash value, the C-RP with the highest IP address wins.
RPT building
Figure 36 RPT building in a PIM-SM domain
Source
Server
As shown in
1. When a receiver wants to join the multicast group G, it uses an IGMP message to inform the
receiver-side DR.
RP
RPT
Join message
Multicast packets
Figure 36, the process of building an RPT is as follows:
DR
87
Host A
Receiver
DR
Host B
Receiver
Host C