Display Stp History - 3Com S7906E Command Reference Manual

These actions include:
BPDU attack guard action
MSTP BPDU format compatibility protection action
Examples
# View the information about ports blocked by STP protection actions.
<Sysname> display stp down-port
Down Port
GigabitEthernet2/0/1
GigabitEthernet2/0/2
Table 1-5 display stp abnormal-port command output description
Field
Down Port
Reason

display stp history

Syntax
display stp [ instance instance-id ] history [ slot slot-number ]
View
Any view
Default Level
0: Visit level
Parameters
instance instance-id: Displays the historic port role calculation information of a particular MSTI. The
value of instance-id ranges from 0 to 31. The minimum value is 0, representing the CIST.
slot slot-number: Displays the historic port role calculation information of the card on the specified slot.
Description
Use the display stp history command to view the historic port role calculation information of the
specified MSTI or all MSTIs.
Note that:
If you do not specify an MSTI ID, this command will display the historic port role calculation
information of all MSTIs. The displayed information is sequenced by MSTI ID, and by port role
calculation time in each MSTI.
If you specify an MSTI ID, this command will display the historic port role calculation information of
only this specified MSTI by the sequence of port role calculation time.
Reason
BPDU-Protected
Formatfrequency-Protected
Name of a blocked port
Reason that caused the port to be blocked.
BPDU-Protected: BPDU attack guard action
Formatfrequency-Protected: MSTP BPDU format compatibility protection
action
Description
1-7