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5.21.10 spanning-tree portfast
The spanning-tree portfast interface configuration command enables 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 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 switch and network operations.
Example
The following example enables PortFast on e5.
Console(config)# interface ethernet e5
Console(config-if)# spanning-tree portfast
5.21.11 spanning-tree link-type
The spanning-tree link-type interface configuration command overrides the default link-type setting. To
reset the default, use the no form of this command.
Syntax
spanning-tree link-type {point-to-point | shared}
no spanning-tree spanning-tree link-type
point-to-point — Specifies the port link type as point-to-point.
shared — Specifies that the port link type is shared.
Default Configuration
The switch derives the link type of a port from the duplex mode. A full-duplex port is considered a
point-to-point link, and a half-duplex port is considered a shared link.
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