85display stp historySyntaxdisplay stp [ instance instance-id ] history [ slot slot-number ] [ | { begin | exclude | include }regular-expression ]ViewAny viewDefault level0: Visit levelParametersinstance instance-id: Displays the historical port role calculation information of a particular MSTI. Theinstance-id argument ranges from 0 to 15, where 0 represents the CIST.slot slot-number: Displays the historical port role calculation information on the specified IRF memberdevice. slot-number represents the number of the member number of the device in the IRF. If thiskeyword-argument combination is not specified, this command displays the historical port rolecalculation information on all IRF member devices.|: Filters command output by specifying a regular expression. For more information about regularexpressions, see the 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, which is a case sensitive string of 1 to 256 characters.DescriptionUse the display stp history command to display the historical port role calculation information of thespecified MSTI or all MSTIs.If you do not specify an MSTI ID, this command will display the historical port role calculation informationof all MSTIs. The displayed information is sorted by MSTI ID, and by port role calculation time in eachMSTI.If you specify an MSTI ID, this command will display the historical port role calculation information ofonly this specified MSTI by the sequence of port role calculation time.Examples# Display the historical port role calculation information of the IRF member device 1 in MSTI 2. display stp instance 2 history slot 1--------------- STP slot 1 history trace ---------------------------------- Instance 2 ---------------------Port GigabitEthernet1/0/1Role change : ROOT->DESI (Aged)Time : 2009/02/08 00:22:56Port priority : 0.00e0-fc01-6510 0 0.00e0-fc01-6510 128.1Port GigabitEthernet1/0/2
