Specifications

show spanning-tree
225
Item Meaning Displayed information
Down The port is in Down status. Indicates that the port is in Down status.
If link aggregation is used, this means that the channel
group is in Down status.
Status Port state If Mode is PVST+:
Blocking: Blocking
Listening: Listening
Learning: Learning
Forwarding: Indicates Forwarding status.
Disabled: Disabled
If Mode is Rapid PVST+:
Discarding: Discarding
Learning: Learning
Forwarding: Indicates Forwarding status.
Disabled: Disabled
This parameter becomes Disabled if the port is in the
Down status.
Role The role of the port Root: Root port
Designated: Designated port
Alternate: Alternate port
Backup: Backup port
If the port is in the Down status, a hyphen (-) is
displayed, because ports in this status are not included
in the topology calculations.
These parameters are commonly used when Mode is
PVST+ or Rapid PVST+.
PortFast PortFast Indicates that the port is a PortFast port.
PortFast(BPDU
Guard)
PortFast (BPDU guard
functionality is applied)
Indicates that the port is a PortFast port, and that the
BPDU guard functionality is applied.
BPDU Filter BPDU filter Indicates that the BPDU filter functionality is applied.
LoopGuard Loop guard Indicates that the port applies the loop guard
functionality.
RootGuard Root guard Indicates that the port applies the root guard
functionality.
Compatible Compatible mode Indicates that the port is operating in compatible mode
when Mode for the Spanning Tree Protocol is Rapid
PVST+. Ports operating in compatible mode do not
perform rapid status transitions.
Example 2
Figure 17-2 Example of displaying information about Single Spanning Tree
> show spanning-tree single
Date 2008/11/14 11:38:40 UTC
Single Spanning Tree:Enabled Mode:STP
Bridge ID Priority: 32768 MAC Address: 00ed.f010.0001
Bridge Status: Root