Configuring PIM-SM 651
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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 routers that may win the DR
election and on the C-RPs that may win RP elections.
Disabling RPT-to-SPT
Switchover
Initially, multicast traffic flows along an RPT to the receivers. By default, the
last-hop switch initiates an RPT-to-SPT switchover process when it receives the first
multicast packet from the RPT. You can disable RPT-to-SPT switchover through the
following configuration.
Follow these steps to disable RPT-to-SPT switchover:
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■ The support for the timer spt-switch command depends on the specific
device model.
■ 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 routers that may
win the DR election and on the C-RPs that may win RP elections.
■ If the multicast source is learned through MSDP, the device will switch to the
SPT immediately after it receives the first multicast packet from the RPT, no
matter how big the traffic rate threshold is set (this threshold is not
configurable on a switch).
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-header-checksum Optional
By default, the checksum is
calculated based on the
header of register messages
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 PIM view pim -
Disable RPT-to-SPT switchover spt-switch-threshold
infinity [ group-policy
acl-number [ order
order-value]]
Optional
By default, the device
switches to the SPT
immediately after it receives
the first multicast packet from
the RPT.
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