HP A5500 SI Switch Series Configuration Manual page 129

messages (BSMs) that it periodically originates and floods the bootstrap messages to the entire PIM-SM
domain.
Figure 39 BSR and C-RPs
Based on the information in the RP-sets, all routers in the network can calculate the location of the
corresponding RPs based on the following rules:
The C-RP with the highest priority wins.
1.
If all the C-RPs have the same priority, their hash values are calculated through the hashing
2.
algorithm. The C-RP with the largest hash value wins.
If all the C-RPs have the same priority and hash value, the C-RP that has the highest IP address wins.
3.
The hashing algorithm used for RP calculation is Value (G, M, C
(G & M) + 12345) XOR C
Table 7 Values in the hashing algorithm
Value
Value
G
M
C
i
&
XOR
Mod
) + 12345) mod 2 31 .
i
Description
Hash value
IP address of the multicast group
Hash mask length
IP address of the C-RP
Logical operator of "and"
Logical operator of "exclusive-or"
Modulo operator, which gives the remainder of an integer division
117
) = (1103515245 * ( (1103515245 *
i