4
Command Line Interface
Default Setting
PortFast mode is disabled.
Command Modes
Interface Configuration (Ethernet, port-channel) mode
Command Usage
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.
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 Ethernet port 1/e15
Console(config)# interface ethernet 1/e15
Console(config-if)# spanning-tree portfast
Related Commands
spanning-tree forward-time
spanning-tree hello-time
spanning-tree max-age
spanning-tree priority
spanning-tree disable
spanning-tree cost
spanning-tree port-priority
spanning-tree link-type
show spanning-tree
spanning-tree link-type
The spanning-tree link-type Interface Configuration mode command overrides the
default link-type setting determined by the duplex mode of the port and enables
Rapid Spanning Tree Protocol (RSTP) transitions to the forwarding state. To return
to the default configuration, use the no form of this command.
Syntax
spanning-tree link-type {point-to-point | shared}
no spanning-tree spanning-tree link-type
Parameters
• point-to-point — Indicates that the port link type is point-to-point.
560
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