Administrator Guide

Layer 2 Switching Commands 753
show spanning-tree
Use the show spanning-tree command in Privileged Exec mode to display the
spanning-tree configuration.
Syntax
show spanning-tree [{gigabitethernet unit/slot/port | port-channel port-
channel-number
| tengigabitethernet unit/slot/port | fortygigabitethernet
unit/slot/port}]
[instance instance-id ]
show spanning-tree [detail] [active | blockedports] | [instance
instance-id ]
show spanning-tree mst-configuration
show spanning-tree {uplinkfast | backbonefast}
• detail —Displays detailed information.
•
active —Displays active ports only.
•
blockedports —Displays blocked ports only.
•
mst-configuration —Displays the MST configuration identifier.
•
instance -id —ID of the spanning tree instance.
•
uplinkfast —Displays Direct Link Rapid Convergence information.
•
backbonefast —Displays Indirect Link Rapid Convergence information.
Default Configuration
This command has no default configuration.
Command Mode
Privileged Exec mode, Configuration mode and all Configuration submodes
User Guidelines
This command has no user guidelines.
Examples
The following examples display spanning-tree information. MST information
is shown in this form of the command regardless of the spanning tree mode.
console#show spanning-tree
2CSNXXX_SWUM204.book Page 753 Monday, January 25, 2016 1:25 PM