121
Predefined user roles
network-admin
network-operator
Examples
# Display information about ports that were shut down by spanning tree protection features.
<Sysname> display stp down-port
Down Port Reason
GigabitEthernet1/0/1 BPDU protection
Table 29 Command output
Field Description
Down Port Name of a port that was shut down by the spanning tree protection features.
Reason
Reason that the port was shut down:
• BPDU protection—Indicates the BPDU guard feature.
• PVST BPDU protection—Indicates the PVST BPDU guard feature.
display stp history
Use display stp history to display port role calculation history.
Syntax
display stp [ instance instance-list | vlan vlan-id-list ] history [ slot
slot-number ]
Views
Any view
Predefined user roles
network-admin
network-operator
Parameters
instance instance-list: Specifies a space-separated list of up to 10 MSTI items. Each item
specifies an MSTI or a range of MSTIs in the form of
instance-id1 [ to instance-id2 ]. The
value for
instance-id2 must be equal to or greater than the value for instance-id1. The
value range for the
instance-id argument is 0 to 4094, and the value 0 represents the CIST.
vlan vlan-id-list: Specifies a space-separated list of up to 10 VLAN items. Each item
specifies a VLAN or a range of VLANs in the form of
vlan-id1 [ to vlan-id2 ]. The value for
vlan-id2 must be equal to or greater than the value for vlan-id1. The value range for the
vlan-id argument is 1 to 4094.
slot slot-number: Specifies an IRF member device by its member ID. If you do not specify a
member device, this command displays information for all member devices.
Usage guidelines
In STP or RSTP mode, the command output is sorted by port role calculation time.
In PVST mode, the command output is sorted by VLAN ID and by port role calculation time in each
VLAN.
• If you do not specify a VLAN, this command applies to all VLANs.
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