R2511-HP MSR Router Series Layer 2 - LAN Switching Command Reference(V5)

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Ethernet1/1 BPDU-Protected
Ethernet1/2 Formatfrequency-Protected
Table 16 Command output
Field Description
Down Port Name of a port shut down by the spanning tree protection functions.
Reason
Reason the port was shut down:
• BPDU-Protected—BPDU guard function.
• Formatfrequency-Protected—MSTP BPDU format frequent change protection function.
display stp history
Use display stp history to display the historical port role calculation information for the specified MSTI or
all MSTIs.
Syntax
display stp [ instance instance-id ] history [ | { begin | exclude | include } regular-expression ]
Views
Any view
Default command level
0: Visit level
Parameters
instance instance-id: Displays the historical port role calculation information for a specific MSTI. The
minimum value of instance-id is 0, representing the CIST, and the maximum value of instance-id is 15.
|: Filters command output by specifying a regular expression. For more information about regular
expressions, see Fundamentals Configuration Guide.
begin: Displays the first line that matches the specified regular expression and all lines that follow.
exclude: Displays all lines that do not match the specified regular expression.
include: Displays all lines that match the specified regular expression.
regular-expression: Specifies a regular expression, a case-sensitive string of 1 to 256 characters.
Usage guidelines
In STP or RSTP mode, the displayed information is sorted by port role calculation time.
In MSTP mode:
• If you do not specify any MSTI, this command displays the historical port role calculation
information for all MSTIs. The displayed information is sorted by MSTI ID and by port role
calculation time in each MSTI.
• If you specify an MSTI, this command displays the historical port role calculation information for the
specified MSTI by the sequence of port role calculation time.
Examples
# In MSTP mode, display the historical port role calculation information for MSTI 2.
<Sysname> display stp instance 2 history
------------------- Instance 2 ---------------------