Configuring IPv6 PIM-SM 1255messages so that the RP can serve specific IPv6 multicast groups. If an (S, G) entryis denied by the filtering rule, or the action for this entry is not defined in thefiltering rule, the RP will send a register-stop message to the DR to stop theregistration process for the IPv6 multicast data.In view of information integrity of register messages in the transmission process,you can configure the device to calculate the checksum based on the entireregister messages. However, to reduce the workload of encapsulating data inregister messages and for the sake of interoperability, this method of checksumcalculation is not recommended.When receivers stop receiving data addressed to a certain IPv6 multicast groupthrough the RP (that is, the RP stops serving the receivers of a specific IPv6multicast group), or when the RP formally starts receiving IPv6 multicast data fromthe IPv6 multicast source, the RP sends a register-stop message to the source-sideDR. Upon receiving this message, the DR stops sending register messagesencapsulated with IPv6 multicast data and starts a register-stop timer. When theregister-stop timer expires, the DR sends a null register message (a registermessage without encapsulated multicast data) to the RP. If the DR receives aregister-stop message during the register probe time, it will refresh its register-stoptimer; otherwise, the DR will start sending register messages with encapsulateddata again.The Register-Stop Timer is set to a random value chosen uniformly from theinterval (0.5 times register_suppression_time, 1.5 times register_suppression_time)minus register_probe_time.Follow these steps to configure IPv6 PIM-SM register messages:n Typically, you need to configure the above-mentioned parameters on thesource-side DR or the RP only. Since both the DR and RP are elected, however, youshould carry out these configurations on the routers that may win the DR electionand on the C-RPs that may win RP elections.Configuring RPT-to-SPTSwitchoverBecause the RPT is not necessarily the tree that has the shortest path, the IPv6multicast forwarding path needs to be switched from the RPT to the SPT when theTo do... Use the command... RemarksEnter system view system-view -Enter IPv6 PIM view pim ipv6 -Configure a filtering rule forregister messagesregister-policy acl6-number OptionalNo register filtering rule bydefaultConfigure the device tocalculate the checksum basedon the entire registermessagesregister-whole-checksum OptionalBased on the header ofregister messages by defaultConfigure the registersuppression timeregister-suppression-timeout intervalOptional60 seconds by defaultConfigure the register probetimeprobe-interval interval Optional5 seconds by default
