Spanning-Tree Portfast Default - Cisco 4500M Command Reference Manual

Chapter2 Cisco IOS Commands for the Catalyst 4500 Series Switches

spanning-tree portfast default

To globally enable PortFast by default on all access ports, use the spanning-tree portfast default
command. To disable PortFast as default on all access ports, use the no form of this command.
Syntax Description
This command has no arguments or keywords.
Defaults
PortFast is disabled.
Command Modes
Global configuration
Command History Release
12.1(12c)EW
Usage Guidelines
Caution
Be careful when using this command. You should use this command only with interfaces that connect to
end stations; otherwise, an accidental topology loop could cause a data packet loop and disrupt the
Catalyst4500 series switch and network operation.
An interface with PortFast mode enabled is moved directly to the spanning tree forwarding state when
linkup occurs without waiting for the standard forward-time delay.
You can enable PortFast mode on individual interfaces using the
configuration mode)
Examples
This example shows how to globally enable PortFast by default on all access ports:
Switch(config)# spanning-tree portfast default
Switch(config)#
Related Commands
show spanning-tree
spanning-tree portfast (interface configuration mode)
78-16201-01
spanning-tree portfast default
no spanning-tree portfast default
Modification
Support for this command was introduced on the Catalyst 4500 series switch.
command.
Catalyst4500 Series SwitchCiscoIOS Command Reference—Release 12.2(18)EW
spanning-tree portfast default
spanning-tree portfast (interface
2-445