H3C Technologies H3C SecPath F1000-E - Manual (Page 189)

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filtering rule to filter register messages so that the RP can serve specific IPv6 multicast groups. If an (S, G)
entry is denied by the 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 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 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 data addressed to a certain IPv6 multicast group through the RP (that is,
the RP stops serving the receivers of that IPv6 multicast group), or when the RP formally starts receiving
register messages with IPv6 multicast data encapsulated from the IPv6 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 IPv6 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 IPv6 PIM view pim ipv6 —
Configure a filtering rule for
register messages
register-policy acl6-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
Based on the header of register
messages by default
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 IPv6 multicast
packets and thus trigger RPT-to-SPT switchover.
Perform the following configuration on routers that may become receiver-side DRs and on C-RP routers.
Follow these steps to configure SPT switchover: