R21xx-HP FlexFabric 11900 Layer 2 LAN Switching Command Reference

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Parameters
instance instance-list: Displays the historical port role calculation information for the MSTIs that are
specified by an instance list, in the format of instance-list = { instance-id [ to instance-id ] }&<1-10>, where
&<1-10> indicates that you can specify up to 10 instances or instance ranges. The value range for the
instance-id argument is 0 to 4094, and the value 0 represents the CIST.
slot slot-number: Displays the historical port role calculation information on the specified card. The
slot-number argument represents the slot number of the card. If this option is not specified, this command
displays the historical port role calculation information on all cards. (In standalone mode.)
chassis chassis-number slot slot-number: Displays the historical port role calculation information on the
specified card of the specified IRF member device. The chassis-number argument represents the ID of the
IRF member device. The slot-number argument represents the slot number of the card. If this option is not
specified, this command displays the historical port role calculation information on all cards of all
member devices in the IRF fabric. (In IRF mode.)
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:
# In standalone mode, display the historical port role calculation information for the card on slot 1 in
MSTI 2.
<Sysname> display stp instance 2 history slot 1
--------------- STP slot 1 history trace ---------------
------------------- Instance 2 ---------------------
Port Ten-GigabitEthernet1/0/1
Role change : ROOT->DESI (Aged)
Time : 2009/02/08 00:22:56
Port priority : 0.00e0-fc01-6510 0 0.00e0-fc01-6510 128.1
Port Ten-GigabitEthernet1/0/2
Role change : ALTER->ROOT
Time : 2009/02/08 00:22:56
Port priority : 0.00e0-fc01-6510 0 0.00e0-fc01-6510 128.2 128.153
# In IRF mode, display the historical port role calculation information for the card on slot 1 of IRF member
device 1 in MSTI 2.
<Sysname> display stp instance 2 history chassis 1 slot 1
---------- STP chassis 1 slot 1 history trace --------
------------------- Instance 2 ---------------------
Port Ten-GigabitEthernet1/0/1
Role change : ROOT->DESI (Aged)
Time : 2009/02/08 00:22:56
Port priority : 0.00e0-fc01-6510 0 0.00e0-fc01-6510 128.1