Adjusting Control Parameters of the C-RP and C-BSR
If a dynamic Rendezvous Point (RP) is used, you can adjust
parameters of Candidate-RPs (C-RPs) and Candidate-BSRs (C-BSRs) as
required. If there is no special requirement, default values are recommended.
Candidate-RPs (C-RPs) periodically send Advertisement messages to a BootStrap router (BSR). The Advertisement messages carry C-RP priorities. You can adjust the C-RP priority, the interval for sending Advertisement messages, and the holdtime of Advertisement messages on a device configured with the C-RP.
At first, each Candidate-BSR (C-BSR) considers itself as a BootStrap router (BSR) and sends Bootstrap messages to all devices in the network. You can adjust the hash mask length of the C-BSR carried in a Bootstrap message, the C-BSR priority, the interval for sending Bootstrap messages, and the holdtime of Bootstrap messages on a device configured with the C-BSR.
A BootStrap router (BSR) boundary can be configured on an interface. Bootstrap messages cannot pass the BSR boundary. Multiple BSR boundary interfaces divide the network into different PIM-SM domains.
ACL-based policies can be set on all devices to filter Candidate-BSR (C-BSR) addresses. The devices then receive only the Bootstrap messages with the source addresses being in the valid C-BSR address range. Therefore, BootStrap router (BSR) spoofing is avoided.
ACL-based policies can be set on all Candidate-BSRs (C-BSRs) to filter Candidate-RP (C-RP) addresses and addresses of the groups that the C-RPs serve. The BootStrap router (BSR) adds C-RP information to the RP-set only when the addresses are in the set legal address range. Therefore, C-RP spoofing is avoided.