401Configuring an RPAn RP can be manually configured or dynamically elected through the BSR mechanism. For a large IPv6PIM 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.IMPORTANT:In an IPv6 PIM network, if both IPv6 PIM-SM and IPv6 BIDIR-PIM are enabled, do not configure the sameRP to provide services for IPv6 PIM-SM and IPv6 BIDIR-PIM simultaneously to avoid IPv6 PIM routing tableerrors.Configuring a static RPIf only one dynamic RP exists in a network, manually configuring a static RP can avoid communicationinterruption because of single-point failures and avoid frequent message exchange between C-RPs andthe BSR.In IPv6 BIDIR-PIM, a static RP can be specified with a virtual IPv6 address. For example, if the IPv6addresses of the interfaces at the two ends of a link are 1001::1/64 and 1001::2/64, you can specify avirtual IPv6 address, like 1001::100/64, for the static RP. As a result, the link becomes an RPL.To make a static RP to work normally, you must perform this configuration on all routers in the IPv6BIDIR-PIM domain and specify the same RP address.To configure a static RP:Step Command Remarks1. Enter system view. system-view N/A2. Enter IPv6 PIM view. pim ipv6 N/A3. Configure a static RP for IPv6BIDIR-PIM.static-rp ipv6-rp-address[ acl6-number ] [ preferred ] bidir No static RP by defaultConfiguring a C-RPIn an IPv6 BIDIR-PIM 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-RP announcementsfrom other routers and organizes the information into an RP-set, which is flooded throughout the entirenetwork. Then, the other routers in the network calculate the mappings between specific group rangesand the corresponding RPs based on the RP-set. H3C recommends that you configure C-RPs on backbonerouters.To guard against C-RP spoofing, configure a legal C-RP address range and the range of multicast groupsto which the C-RP is designated on the BSR. In addition, because every C-BSR has a chance to becomethe BSR, you must configure the same filtering policy on all C-BSRs in the IPv6 BIDIR-PIM domain.When you configure a C-RP, ensure a relatively large bandwidth between this C-RP and the other devicesin the IPv6 BIDIR-PIM domain.
