H3C Technologies H3C SecPath F1000-E - Manual (Page 122)

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filtering rule, or the action for this entry is not defined in the filtering rule, the RP will send a register-stop
message to the DR to stop the registration process for the 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 entire register messages. However, to reduce the
workload of encapsulating data in register messages and for the sake of interoperability, this method of
checksum calculation is not recommended.
When receivers stop receiving multicast data addressed to a certain multicast group through the RP (that
is, the RP stops serving the receivers of that multicast group), or when the RP formally starts receiving
register messages with multicast data encapsulated from the multicast source, the RP sends a register-stop
message to the source-side DR. Upon receiving this message, the DR stops sending register messages
encapsulated with multicast data and starts a register-stop timer. When the register-stop timer expires, the
DR sends a null register message (a register message without encapsulated multicast data) to the RP. If the
DR receives a register-stop message during the register probe time, it will reset its register-stop timer;
otherwise, the DR starts sending register messages with encapsulated data again when the register-stop
timer expires.
The register-stop timer is set to a random value chosen uniformly from the interval (0.5 times
register_suppression_time, 1.5 times register_suppression_time) minus register_probe_time.
Configure a filtering rule for register messages on all C-RP routers and configure them to calculate the
checksum based on the entire register messages. Configure the register suppression time and the register
probe time on all routers that may become source-side DRs.
Follow these steps to configure register-related parameters:
To do... Use the command... Remarks
Enter system view system-view —
Enter public network PIM view pim —
Configure a filtering rule for
register messages
register-policy acl-number
Optional
No register filtering rule by default
Configure the device to calculate
the checksum based on the entire
register messages
register-whole-checksum
Optional
By default, the checksum is
calculated based on the header of
register messages
Configure the register suppression
time register-suppression-timeou
t interval Optional
60 seconds by default
Configure the register probe time probe-interval interval
Optional
5 seconds by default
Configuring SPT Switchover
Both the receiver-side DR and the RP can periodically check the traffic rate of passing-by multicast packets
and thus trigger an SPT switchover process.
Perform the following configuration on routers that may become receiver-side DRs and on C-RP routers.
Follow these steps to configure SPT switchover: