Spanning Tree Commands 555
console(config)#spanning-tree mst 1 priority 4096
spanning-tree portfast
Use the spanning-tree portfast command in Interface Configuration mode to
enable PortFast mode. In PortFast mode, the interface is immediately put
into the forwarding state upon linkup, without waiting for the timer to expire.
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 Mode
Interface Configuration (Ethernet, Port-Channel) mode
User Guidelines
This command only applies to all ports. The command is to be used only with
interfaces connected to end stations. Otherwise, an accidental topology loop
could cause a data packet loop and disrupt switch and network operations.
An interface with PortFast mode enabled is moved directly to the spanning
tree forwarding state when linkup occurs without waiting the standard
forward-time delay.
Example
The following example enables PortFast on 1/g5.
console(config)#interface ethernet 1/g5
console(config-if-1/g5)#spanning-tree portfast
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