The spt-switch-threshold infinity group-policy command configures the range of multicast groups so that a DR on the group member side never triggers an SPT switchover.
The undo spt-switch-threshold infinity group-policy command restores the default configuration.
By default, a receiver's DR performs a switchover from the RPT to the SPT immediately after receiving the first multicast data packet.
| Parameter | Description | Value |
|---|---|---|
| basic-acl6-number |
Indicates that a basic ACL is applied. |
The value is an integer ranging from 2000 to 2999. |
| acl6-name acl6-name |
Specifies the name of a named basic IPv6 ACL. |
The value is a string of 1 to 64 case-sensitive characters without spaces. The value must start with a letter (a to z or A to Z, case sensitive). |
| order order-value |
Specifies the order of an IPv6 ACL in the group policy. If a multicast group matches more than one IPv6 ACL, the system determines the threshold to be used based on order-value of the IPv6 ACLs. |
The value is any integer that is not specified for other IPv6 ACLs. If this parameter is not specified, the original IPv6 ACL order is used. |
| group-policy |
Limits the range of multicast groups for which a multicast data forwarding rate threshold is effective. |
- |
Usage Scenario
In PIM-SM, a source's DR encapsulates multicast data packets in a Register message and sends the Register message to the rendezvous point (RP). The RP then transmits the multicast data packets along the RPT. The RP and the receiver's DR are responsible for checking the rate of multicast data packets.
If a rate threshold is configured on the receiver's DR, the receiver's DR sends a Join message to the source only it finds that the rate of multicast data packets exceeds the threshold and then triggers the switchover from the RPT to the SPT. To set such a rate threshold, run the spt-switch-threshold command. This command takes effect on the Router that functions as the receiver's DR, but does not take effect on the RP.Prerequisites
The multicast routing function has been enabled using the multicast ipv6 routing-enable command in the public network instance view.
Precautions
If the spt-switch-threshold command is run more than once for one multicast group, the first command that the multicast group matches takes effect.
<HUAWEI> system-view [~HUAWEI] acl ipv6 2010 [*HUAWEI-acl6-basic-2010] rule permit source ff02:: 96 [*HUAWEI-acl6-basic-2010] quit [*HUAWEI] multicast ipv6 routing-enable [*HUAWEI] pim ipv6 [*HUAWEI-pim6] spt-switch-threshold infinity group-policy 2010