display stp abnormal-interface

Function

The display stp abnormal-interface command displays information about abnormal interfaces running the Spanning Tree Protocol (STP).

Format

STP/RSTP/MSTP: display stp [ process process-id ] [ instance instance-id ] abnormal-interface

VBST: display stp [ vlan vlan-id ] abnormal-interface

Parameters

Parameter	Description	Value
process process-id	Displays the ID of a specified multi service transport platform (MSTP) process. If process process-id is not specified, the status and statistics of the MSTP process with ID 0 will be displayed.	The value is an integer in the range 1 to 31.
instance instance-id	Displays the status and statistics of a specified spanning tree instance. If instance instance-id is not specified, the status and statistics of all spanning tree instances will be displayed in the sequence of the interface numbers.	The value is an integer in the range 0 to 4094. The value 0 indicates a common and internal spanning tree (CIST) instance. NOTE: instance-id ranges from 0 to 4094. Each process supports a maximum of 65 instances.
vlan vlan-id	Displays information about abnormal ports running STP in a specified VLAN. If vlan vlan-id is not specified, information about abnormal ports running STP in all VLANs is displayed. NOTE: If vlan vlan-id is specified, only information about abnormal ports running VBST is displayed.	The value is an integer that ranges from 1 to 4094.

Parameter

Description

Value

process process-id

Displays the ID of a specified multi service transport platform (MSTP) process.

If process process-id is not specified, the status and statistics of the MSTP process with ID 0 will be displayed.

The value is an integer in the range 1 to 31.

instance instance-id

Displays the status and statistics of a specified spanning tree instance.

If instance instance-id is not specified, the status and statistics of all spanning tree instances will be displayed in the sequence of the interface numbers.

The value is an integer in the range 0 to 4094. The value 0 indicates a common and internal spanning tree (CIST) instance.

NOTE:

instance-id ranges from 0 to 4094. Each process supports a maximum of 65 instances.

vlan vlan-id

Displays information about abnormal ports running STP in a specified VLAN.

If vlan vlan-id is not specified, information about abnormal ports running STP in all VLANs is displayed.

NOTE:

If vlan vlan-id is specified, only information about abnormal ports running VBST is displayed.

The value is an integer that ranges from 1 to 4094.

Views

All views

Default Level

1: Monitoring level

Usage Guidelines

Usage Scenario

If a device has many interfaces and the display stp command output displays vast information, viewing information about abnormal interfaces running STP is difficult.

You can use the display stp abnormal-interface command to view information about abnormal interfaces running STP.

Precautions

If you run this command in the system view without specifying an MSTP process, information about MSTP process 0 is displayed by default.
If you run this command in the MSTP process view without specifying an MSTP process, information about the MSTP process in this view is displayed by default.
In VBST, if NAC authentication is configured but user authentication fails on a port that is configured as an edge port and is in Active state, information about the port is not displayed.

Example

# Display information about abnormal interfaces in process 0 running STP

<HUAWEI> display stp instance 0 abnormal-interface

MSTID    Interface                     Status          Reason                   
    0    GigabitEthernet0/0/0          DISCARDING      LOOP-Protected           
    0    GigabitEthernet0/0/1          DOWN            BPDU-Protected           
    0    GigabitEthernet0/0/2          DISCARDING      ROOT-Protected           
    0    GigabitEthernet0/0/3          DISCARDING      LOOP-Detected

# Display information about abnormal ports running VBST in VLAN 5.

<HUAWEI> display stp vlan 5 abnormal-interface

VLAN    Interface                     Status          Reason                   
   5    GigabitEthernet0/0/0          DISCARDING      LOOP-Protected           
   5    GigabitEthernet0/0/1          DOWN            BPDU-Protected           
   5    GigabitEthernet0/0/2          DISCARDING      ROOT-Protected           
   5    GigabitEthernet0/0/3          DISCARDING      LOOP-Detected

**Table 1** Description of the **display stp abnormal-interface** command output
Item	Description
MSTID	MSTP instance ID
Interface	Interface type
Status	Status of an interface after the STP protection takes effect DOWN: indicates that the physical status of the interface is Down (including error-down). DISCARDING: indicates the blocked interface after the topology of the spanning tree becomes stable.
Reason	An interface running STP becomes abnormal due to one of the following: Root-Protected: indicates that the root protection takes effect. Loop-Protected: indicates that the loop protection takes effect. BPDU-Protected: indicates that the BPDU protection takes effect. Loop-Detected: indicates that the loop detection takes effect. PVID-Inconsistency: The PVID of the directly connected interface is inconsistent.
VLAN	VLAN ID.