16.1.4 Toggle-back operation

Switchover and switch-back change the port that performs communication. Switchover or switch-back is triggered by one of the following events when the partner port of the active port is the standby port:

• When a failure occurs on the active port

• When the automatic switch-back wait time has expired

• When a user enters an operation command to change the active port

When switchover or switch-back occurs, all the MAC addresses learned on the previous active port are cleared, and the new active port starts communication. When the uplink port pair is configured to send flush control frames or MAC address update frames, the new active port sends either type of frame when switchover or switch-back occurs. If the port reset function is set, the old active port is temporarily brought down.

The following figure illustrates switchover.

Figure 16-3: Switching operation (when a flush control frame or MAC address update frame is sent)