Alcatel Carrier Internetworking Solutions 6648 - Manual (Page 275)

Troubleshooting PIM-SM RP-SET
OmniSwitch Troubleshooting Guide September 2005 page 16-13
RP-SET
An RP-SET contains a set of Candidates-RP IP addresses that want to participate as RP for multicast
group. The RP-SET is derived from the C RP-Advertisements received by the BSR. RP-SETs are adver-
tised by the BSR in a bootstrap message to all PIM SM routers by using the ALL-PIM-ROUTER address
224.0.0.13. It contains details on the each C-RP IP address, the multicast group routers want to participate
and the corresponding priority.
The DR to determine the RP for each group which it has active members uses the RP-SET. The hash func-
tion algorithm, used to select the RP, takes as input the group address and the addresses of the Candidate
RPs and gives as output one RP address to be used. The protocol requires that all routers hash to the same
RP within a domain for the same multicast group.
Com 3 Com 3 Com 3
Com 3
192.168.13.101 192.168.13.1
192.168.11.1
192.168.11.2
192.168.12.2
192.168.12.1
BSR
C-RP for 225.1.1.1
C-RP for 226.1.1.1
C-RP for 227.1.1.1
BOOTSTRAP message to ALL-PIMSM-ROUTER
BSR ID: 192.168.13.1
Group: 225.1.1.1
RP address: 192.168.11.2
Group: 226.1.1.1
RP address: 192.168.12.2
Group: 227.1.1.1
RP address: 192.168.12.2
Bootstrap
message
Bootstrap
message
Bootstrap
message