MSTP/2/hwMstpProRootShake_active

Message

MSTP/2/hwMstpProRootShake_active: The root bridge role flapped.(ProcessID=[ProcessID], InstanceID=[InstanceID])

Description

The root bridge role flapped for a non-root bridge device.

Parameters

Parameter Name	Parameter Meaning
ProcessID	Process ID
InstanceID	Instance ID

Possible Causes

When BPDU packets are transparently transmitted on an MSTP network, some ports receive multiple copies of BPDU packets. If the root bridge information in multiple copies of BPDU packets is inconsistent, the root bridge flaps and the MSTP network reconverges. When the count of root flaps up to 10 in 5 minutes, the alarm will be triggered.

Procedure

1. Check MSTP logs to determine whether alarms indicating frequent intermittent Down events are reported on the ports or port priorities are frequently changed.

If yes, go to Step 2.
If not, go to Step 3.

2. Deploy the network topology correctly and check whether the alarm is cleared.

If the alarm is cleared, no action is required.
If the alarm persists, go to Step 3.

3. Check MSTP logs to determine the source of BPDUs on the ports and identify the flapping source.

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