Reference Guide

Spanning-Tree Commands 309
User Guidelines
There are no user guidelines for this command.
Example
The following example configures the spanning priority on Ethernet port 1/e15 to 96.
spanning-tree portfast
The spanning-tree portfast Interface Configuration mode command enables PortFast mode. In
PortFast mode, the interface is immediately put into the forwarding state upon linkup without
waiting for the standard forward time delay. To disable PortFast mode, use the no form of this
command.
Syntax
spanning-tree portfast
no spanning-tree portfast
Default Configuration
PortFast mode is disabled.
Command Modes
Interface Configuration (Ethernet, port-channel) mode
User Guidelines
• This feature should be used only with interfaces connected to end stations. Otherwise, an
accidental topology loop could cause a data packet loop and disrupt device and network
operations.
Example
The following example enables PortFast on Ethernet port 1/e15.
Console(config)# interface ethernet 1/e15
Console(config-if)# spanning-tree port-priority 96
Console(config)# interface ethernet 1/e15
Console(config-if)# spanning-tree portfast