HP 6125XLG R2306-HP 6125XLG Blade Switch IP Multicast Configuration Guide - Page 81
Configuring a C-RP
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Configuring a C-RP IMPORTANT: When you configure a C-RP, reserve a relatively large bandwidth between the C-RP and the other devices in the PIM-SM domain. In a PIM-SM domain, if you want a router to become the RP, you can configure the router as a C-RP. The BSR collects the C-RP information according to the received advertisement messages from C-RPs or the auto-RP announcements from other routers. Then, it organizes the C-RP information into the RP-set information, which is flooded throughout the entire network. Then, the other routers in the network can determine the RPs for different multicast group ranges based on the RP-set information. HP recommends configuring C-RPs on backbone routers. To enable the BSR to distribute the RP-set information in the PIM-SM domain, the C-RPs must periodically send advertisement messages to the BSR. The BSR learns the C-RP information, encapsulates the C-RP information and its own IP address in a BSM, and floods the BSM to all PIM routers in the domain. An advertisement message contains a holdtime option, which defines the C-RP lifetime for the advertising C-RP. After the BSR receives an advertisement message from a C-RP, it starts a timer for the C-RP. If the BSR does not receive any advertisement message when the timer expires, it regards the C-RP failed or unreachable. To guard against C-RP spoofing, you must configure a legal C-RP address range and the multicast group range to which the C-RP is designated on the BSR. In addition, because every C-BSR might become the BSR, you must configure the same filtering policy on all C-BSRs in the PIM-SM domain. To configure a C-RP: Step 1. Enter system view. Command system-view 2. Enter PIM view. pim 3. Configure a C-RP. c-rp ip-address [ advertisement-interval adv-interval | group-policy acl-number | holdtime hold-time | priority priority ] * 4. (Optional.) Configure a legal C-RP address range and the multicast group range to crp-policy acl-number which the C-RP is designated. Remarks N/A N/A By default, no C-RP is configured. By default, no restrictions are defined. Configuring a BSR You must configure a BSR if C-RPs are configured to dynamically select the RP. In a network with a static RP, this configuration task is unnecessary. A PIM-SM domain can have only one BSR, but must have at least one C-BSR. Any router can be configured as a C-BSR. Elected from C-BSRs, the BSR is responsible for collecting and advertising RP information in the PIM-SM domain. 74