PIM - BSR load balancing

With BSR if multiple RPs are defined to service the same multicast groups then the BSR candidate router will distribute the load amongst these RPS. This is done using an algorithm based on the HASH length defined. The longer the hash length the more random the assignment.

Based on the following config, the RP assignment can be examined on the routers.


R1
ip pim rp-candidate Lo0

R3
ip pim rp-candidate Lo0

R5
ip pim bsr-candidate Lo0 32

Here i examine the RP for group 238.1.1.1 and 237.1.1.1. The BSR has assigned R3 as the R3 (150.1.9.9) as the RP for 238.1.1.1 and R1 (150.1.7.7) AS THE rp FOR 237.1.1.1.


R1#show ip pim rp-hash 238.1.1.1
RP 150.1.9.9 (?), v2
Info source: 150.1.5.5 (?), via bootstrap, priority 0, holdtime 150
Uptime: 00:00:48, expires: 00:01:46
PIMv2 Hash Value (mask 255.255.255.255)
RP 150.1.7.7, via bootstrap, priority 0, hash value 377749190
RP 150.1.9.9, via bootstrap, priority 0, hash value 1884030652
R1#show ip pim rp-hash 237.1.1.1
RP 150.1.7.7 (?), v2
Info source: 150.1.5.5 (?), via bootstrap, priority 0, holdtime 150
Uptime: 00:01:12, expires: 00:01:39
PIMv2 Hash Value (mask 255.255.255.255)
RP 150.1.7.7, via bootstrap, priority 0, hash value 1501822662
RP 150.1.9.9, via bootstrap, priority 0, hash value 860620476