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Table 1-4 display stp abnormal-port command output description
Field Description
MSTID ID of the MSTI to which an abnormally blocked port belongs
Blocked Port Name of an abnormally blocked port
Reason
Reason that caused abnormal blocking of the port.
z ROOT-Protected: root guard function
z LOOP-Protected: loop guard function
z Formatcompatibility-Protected: MSTP BPDU format incompatibility
protection function
display stp down-port
Syntax
display stp down-port
View
Any view
Default Level
1: Monitor level
Parameters
None
Description
Use the display stp down-port command to display the information about ports blocked by STP
protection functions.
These functions include:
z BPDU attack guard function
z MSTP BPDU format frequent change protection function
Examples
# View the information about ports blocked by STP protection functions.
<Sysname> display stp down-port
Down Port Reason
GigabitEthernet1/0/1 BPDU-Protected
GigabitEthernet1/0/2 Formatfrequency-Protected
Table 1-5 display stp down-port command output description
Field Description
Down Port Name of a blocked port
Reason
Reason that caused the port to be blocked.
z BPDU-Protected: BPDU attack guard function
z Formatfrequency-Protected: MSTP BPDU format frequent change
protection function
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