multicast-domain switch-delay

Usage Scenario

When a downstream Provider Edge (PE) joins the Switch-Group, setting up the Switch-MDT on the public network takes time. Therefore, the switching delay needs to be configured. The upstream PE sends a switching packet. After the delay expires, the PE device system uses the Switch-Group to encapsulate data, and data is switched from the Share-MDT to the Switch-MDT. Before the switch-delay timer expires, the system continues to detect the data forwarding rate. If the rate remains higher than the switchover threshold, data packets are switched to the Switch-MDT. Otherwise, the packets are still forwarded along the Share-MDT.

Prerequisites

The multicast-domain share-group command has been configured in the VPN.

Configuration Impact

If you run the command multiple times, the last configuration overrides the previous ones.

Precautions

In the actual switchover process, there is a delay about 1 to 30 seconds before the device detects changes in data forwarding rate. The delay means that the PE device system starts the switch-delay timer about 1 to 30 seconds after the data forwarding rate changes. The delay is not included in switch-delay. Therefore, the total delay from the time when the data forwarding rate changes to the time when the system completes the switchover is longer than switch-delay by 1 to 30 seconds.