3Com S7902E Command Reference Manual - page 418
1-7
These actions include:
z
BPDU attack guard action
z
MSTP BPDU format compatibility protection action
Examples
# View the information about ports blocked by STP protection actions.
Down Port Reason
GigabitEthernet2/0/1 BPDU-Protected
GigabitEthernet2/0/2 Formatfrequency-Protected
Table 1-5 display stp abnormal-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 action
z
Formatfrequency-Protected: MSTP BPDU format compatibility protection
action
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:
z
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.
z
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.