429
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, do not use
this checksum calculation method.
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:
Step
Command
Remarks
1.
Enter system view.
system-view
N/A
2.
Enter public network IPv6
PIM view or VPN instance
IPv6 PIM view.
pim ipv6
[
vpn-instance
vpn-instance-name
]
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 switchover to SPT
CAUTION:
If the switch is an RP, disabling switchover to SPT might cause multicast traffic forwarding 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 the receiver-side DR or the RP, it initiates a switchover to SPT by default upon
receiving the first multicast packet. You can disable the switchover from RPT to SPT.
To disable the switchover to SPT:
