STP abnormal status locating method on an AR router

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If the STP status on an AR router is abnormal, follow the procedure below for fault locating:
1. Check configuration of different interfaces.
2. Run the debug stp packet command to check STP packet receiving/transmission status on different interfaces.
3. If the fault cannot be located, collect logs, alarms, and debug information that are generated when the fault occurred, and contact Huawei engineers.

Other related questions:
Locating the fault when the MSTP status of a WLAN device is abnormal
When the MSTP status of a WLAN device is abnormal, perform the following operations to locate the fault: 1. Check whether configurations on each interface of the device are correct. The configurations of interfaces in the same MST domain must be the same. 2. Run the debugging stp [ interface interface-type interface-number ] packet { all | send | receive } command to check whether each interface properly sends and receives STP packets. 3. If the fault persists, collect log, alarm, and debugging information, and contact Huawei technical personnel.

STP enabling/disabling method on an AR router
By default, STP is enabled on an AR router globally and on Layer 2 interface. Run the stp enable command in the system or interface view to enable STP globally or on Layer 2 interface. Run the stp disable command in the system or interface view to disable STP globally or on Layer 2 interface.

Which status do MSTP interfaces of an AR router have and how do they process packets
MSTP interface status: - Forwarding: In this state, an interface forwards user traffic. Only the root interface or a specified interface can be in this state. - Learning: This is a transitional state. In this state, a switch will build a MAC address table according to the user traffic it receives (but not forward the user traffic). That is why this state is referred to as a learning state. - Discarding: In this state, an interface blocks packets and does not learn MAC addresses.

Does a change in the MSTP status of an AR router interface affect the MSTP status of other interfaces in the same MST region
If the MSTP status of an interface changes, the device will recalculate the status of all other interfaces in the MST region.

Why is the subnet in an abnormal status
In hardware SDN, the subnet segments of all VPCs that use the same external network cannot overlap. Otherwise, the subnet status may be abnormal. Therefore, if the subnet status is abnormal, create subnets on different network segments.

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