MSTP/1/TOPOLOGY_CHANGE

• Cause 1: The network topology changed because a new link was added into the network topology.

1. Check whether the added physical link is necessary.

• If the added physical link is necessary, go to Step 2.
• If the added physical link is unnecessary, go to Step 3.

2. Run the display stp command to check whether the interfaces are consistent with the STP calculation results.

• If the interfaces are consistent with the STP calculation results, the alarm will be cleared.
• If the interfaces are inconsistent with the STP calculation results, go to Step 3.

3. Collect alarm information and configuration information, and then contact technical support personnel.

• Cause 2: The network topology changed because interfaces went Up or Down.

1. Run the undo shutdown command in the interface view to check whether the alarm is cleared. If the alarm persists, go to Step 2.

2. Collect alarm information and configuration information, and then contact technical support personnel.

• Cause 3: A fault occurred on the network.

1. Rectify the fault in the original network topology. If the fault persists, go to Step 2.

2. Collect alarm information and configuration information, and then contact technical support personnel.