Operation Manual – MulticastH3C S5600 Series Ethernet Switches Chapter 4 PIM Configuration4-14To do... Use the command... RemarksConfigurecandidate RPsc-rp interface-typeinterface-number[ group-policy acl-number| priority priority ]*OptionalBy default, candidate RPs are notset for the switch and the value ofpriority is 0.Limit the range ofvalid C-RPs crp-policy acl-numberOptionalBy default, the range of validC-RPs is not set for the switch.Note:z If the range of multicast groups that an RP serves is not specified when the RP isconfigured, the RP serves all multicast groups.z If the configured static RP address is the address of an UP interface on the localswitch, the switch will serve as an RP.z Static RPs do not take effect when the RP generated by the BSR mechanism takeseffect.4.3.3 Configuring a BSRA PIM-SM domain can have only one BSR, but must have at least one C-BSR. Anyrouter can be configured as a C-BSR. Elected from C-BSRs, the BSR is responsible forcollecting and advertising RP information in the PIM-SM domain.I. Configuring a C-BSRC-BSRs should be configured on routers in the backbone network. When configuring arouter as a C-BSR, be sure to specify a PIM-SM-enabled interface on the router. TheBSR election process is summarized as follows:z Initially, every C-BSR assumes itself to be the BSR of this PIM-SM domain, anduses its interface IP address as the BSR address to send bootstrap messages.z When a C-BSR receives the bootstrap message of another C-BSR, it firstcompares its own priority with the other C-BSR’s priority carried in message. TheC-BSR with a higher priority wins. If there is a tie in the priority, the C-BSR with ahigher IP address wins. The loser uses the winner’s BSR address to replace itsown BSR address and no longer assumes itself to be the BSR, while the winnerretains its own BSR address and continues assuming itself to be the BSR.Configuring a legal range of BSR addresses enables filtering of bootstrap messagesbased on the address range, thus to prevent a maliciously configured host frommasquerading as a BSR. The same configuration needs to be made on all routers in
