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216 CHAPTER 15: SPANNING-TREE COMMANDS
Example
The following example configures the spanning priority on Ethernet port
g15 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 [auto]
no spanning-tree portfast
Parameters
■ auto — Specifies that the software waits for 3 seconds (With no
BPDUs received on the interface) before putting the interface into the
PortFast mode.
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 g15.
Console(config)# interface ethernet g15
Console(config-if)# spanning-tree port-priority 96
Console(config)# interface ethernet g15
Console(config-if)# spanning-tree portfast