3Com 5500G-EI Command Reference Guide - Page 265
Example, crp-policy, Syntax, Parameter, Description, A C-RP router unicasts C-RP messages to the BSR
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PIM Configuration Commands 265 Use the undo c-rp to remove the configuration. By default, no candidate RP is configured. Related command: c-bsr. Example Configure the Ethernet Switch to advertise the BSR that it is the C-RP in the PIM domain. The standard access list 2000 defines the groups related to the RP. The address of C-RP is designated as the IP address of VLAN-interface10. system-view System View: return to User View with Ctrl+Z [SW5500]multicast routing-enable [SW5500]acl number 2000 [SW5500-acl-basic-2000]rule permit source 225.0.0.0 0.255.255.255 [SW5500-acl-basic-2000]quit [SW5500]pim [SW5500-pim]c-rp vlan-interface 10 group-list 2000 crp-policy Syntax crp-policy acl-number undo crp-policy View PIM View Parameter acl-number: ACL number imported in C-RP filtering policy, ranging from 3000 to 3999. Description Use the crp-policy command to limit the range of legal C-RP, as well as target service group range of each C-RP, prevent C-RP spoofing. Use the undo crp-policy command to restore the default setting so that no range limit is set and all received messages are taken as legal. In a PIM SM network, every router can set itself as a C-RP (candidate rendezvous point) servicing particular groups. If elected, a C-RP becomes the RP servicing the current group. A C-RP router unicasts C-RP messages to the BSR, which then propagates the C-RP messages among the network using BSR messages. To prevent C-RP spoofing, you need to configure a crp-policy on the BSR to limit legal C-RP range and their service group range. Since each C-BSR has the chance to become the BSR, you must configure the same filtering policy on each C-BSR router. This command uses the ACLs numbered between 3000 and 3999. The source parameter in the rule command is translated as C-RP address in the crp-policy command, and the destination parameter as the service group range of this C-RP address. For the C-RP messages received, only when their C-RP addresses match