4-11To do... Use the command... RemarksEnter interface view interface interface-typeinterface-number —Enable PIM-SM pim sm RequiredDisabled by defaultConfiguring an RPAn RP can be manually configured or dynamically elected through the BSR mechanism. For a largePIM network, static RP configuration is a tedious job. Generally, static RP configuration is just a backupmeans for the dynamic RP election mechanism to enhance the robustness and operation manageabilityof a multicast network.Configuring a static RPIf there is only one dynamic RP in a network, manually configuring a static RP can avoid communicationinterruption due to single-point failures and avoid frequent message exchange between C-RPs and theBSR. To enable a static RP to work normally, you must perform this configuration on all the routers in thePIM-SM domain and specify the same RP address.Follow these steps to configure a static RP:To do… Use the command… RemarksEnter system view system-view —Enter PIM view pim —Configure a static RP static-rp rp-address [ acl-number ] OptionalNo static RP by defaultConfiguring a C-RPIn a PIM-SM domain, you can configure routers that intend to become the RP as C-RPs. The BSRcollects the C-RP information by receiving the C-RP-Adv messages from C-RPs or auto-RPannouncements from other routers and organizes the information into an RP-set, which is floodedthroughout the entire network. Then, the other routers in the network calculate the mappings betweenspecific group ranges and the corresponding RPs based on the RP-set. We recommend that youconfigure C-RPs on backbone routers.To guard against C-RP spoofing, you need to configure a legal C-RP address range and the range ofmulticast groups to be served on the BSR. In addition, because every C-BSR has a chance to becomethe BSR, you need to configure the same filtering policy on all C-BSRs in the PIM-SM domain.Follow these steps to configure a C-RP:To do... Use the command... RemarksEnter system view system-view —Enter PIM view pim —Configure candidateRPsc-rp interface-typeinterface-number [ group-policyacl-number | priority priority ]*OptionalBy default, candidate RPs are not set for theswitch and the value of priority is 0.
