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When receivers stop receiving data addressed to a certain IPv6 multicast group through the RP (which
means that the RP stops serving the receivers of that IPv6 multicast group), or when the RP starts receiving
IPv6 multicast data from the IPv6 multicast source along the SPT, the RP sends a register-stop message to
the source-side DR. After receiving this message, the DR stops sending register messages encapsulated
with IPv6 multicast data and starts a register-stop timer. Before the register-stop timer expires, the DR
sends a null register message (a register message without 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 might become IPv6 source-side DRs.
To configure register-related parameters:
Ste
Command Remarks
1. Enter system view.
system-view N/A
2. Enter IPv6 PIM view.
pim ipv6 N/A
3. Configure a filtering rule for
register messages.
register-policy acl6-number
Optional.
No register filtering rule by default.
4. 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.
5. Configure the register
suppression time.
register-suppression-timeout
interval
Optional.
60 seconds by default.
6. Configure the register probe
time.
probe-interval interval
Optional.
5 seconds by default.
Disabling the switchover to SPT
CAUTION:
If the switch is an RP, disabling switchover to SPT mi
ht cause multicast traffic forwardin
failures on the
source-side DR. When disabling switchover to SPT, be sure you fully understand its impact on your
network.
If the switch acts as an RP or the receiver-side DR, it initiates the switchover to SPT by default upon
receiving the first IPv6 multicast packet along the RPT. You can disable the switchover from RPT to SPT.
To configure the switchover to SPT:
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