(Optional) Configuring SPT Switchover Conditions
Context
A high volume of multicast data traffic increases the load of an RP and may result in a fault. The DR at the group member side triggers an SPT switchover to reduce the burden of the RP.
By default, a DR at the group member side immediately triggers an SPT switchover after receiving the first multicast data packet. You can configure a traffic rate threshold on a DR at the group member side to trigger an SPT switchover or prevent the DR from triggering an SPT switchover.
Setting the traffic rate for triggering an SPT switchover may affect multicast service operations. You are advised to use the default triggering condition. That is, an SPT switchover is triggered immediately after the first multicast data packet is received from the RPT. The default triggering condition reduces the number of multicast packets forwarded on the RPT.
Default Settings
Table 1 lists the default settings of SPT switchover conditions.
| Parameter | Default Setting |
|---|---|
Group policy that specifies the groups to which the SPT switchover conditions apply |
No group policy configured (The SPT switchover conditions apply to all multicast groups.) |
Interval for checking the forwarding rate of multicast data |
15s |
Procedure
- Run system-view
The system view is displayed.
- Run pim-ipv6
The PIM-IPv6 view is displayed.
- Run spt-switch-threshold { traffic-rate | infinity } [ group-policy basic-acl6-number [ order order-value ] ]
The SPT switchover condition is configured.
traffic-rate specifies the rate threshold that triggers an SPT switchover. infinity indicates that the SPT switchover is never triggered.
- Run timer spt-switch interval
The interval for checking the forwarding rate of multicast data is configured.