3Com Switch 8800 Advanced Software V5 Configuration Guide

Configuring IPv6 PIM Common Information 691
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Typically, you need to configure the above-mentioned parameters on the
receiver-side DR and the RP only. Since both the DR and RP are elected, however,
you should carry out these configurations on the devices that may win the DR
election and on the C-RPs that may win RP elections.
Disabling RPT-to-SPT
Switchover
When a Switch 8800 serves as the receiver-side DR, by default, it initiates an
RPT-to-SPT switchover process immediately after receiving the first multicast
packet along the RPT. You can disable RPT-to-SPT switchover with the following
command.
Follow these steps to disable RPT-to-SPT switchover:
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To avoid forwarding failure, do not disable RPT-to-SPT switchover on a device that
may become an RP (namely, a static RP or a C-RP).
Configuring IPv6 PIM
Common Information
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For the configuration tasks described in this section:
■ Configurations performed in IPv6 PIM view are effective to all interfaces, while
configurations performed in interface view are effective to the current interface
only.
■ If the same function or parameter is configured in both PIM IPv6 view and
interface view, the configuration performed in interface view has given priority,
regardless of the configuration sequence.
IPv6 PIM Common
Information
Configuration Task List
Complete these tasks to configure IPv6 PIM common information:
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 timeout time
register-suppression-timeo
ut interval
Optional
60 seconds by default
Configure the probe time probe-interval interval Optional
5 seconds by default
To do... Use the command... Remarks
To do... Use the command... Remarks
Enter system view system-view -
Enter IPv6 PIM view pim ipv6 -
Disable RPT-to-SPT switchover spt-switch-threshold
infinity [ group-policy
acl6-number [ order
order-value ] ]
Optional
By default, the device
switches to the SPT
immediately after it receives
the first IPv6 multicast packet
from the RPT.