Spanning-Tree Portfast (Interface) - Cisco MWR 2941 Command Reference Manual

spanning-tree portfast (interface)

spanning-tree portfast (interface)
To enable PortFast mode where the interface is immediately put into the forwarding state upon linkup
without waiting for the timer to expire, use the spanning-tree portfast command in interface
configuration mode. To return to the default settings, use the no form of this command.
Syntax Description
disable
edge
network
trunk
Command Default
The settings that are configured by the spanning-tree portfast default command.
Command Modes
Interface configuration (config-if)
Command History Release
12.2(14)SX
12.2(17d)SXB
12.2(33)SRA
12.2(33)SXI
15.0(1)MR
Usage Guidelines
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 Catalyst 6500 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.
Be careful when using the no spanning-tree portfast command. This command does not disable
PortFast if the spanning-tree portfast default command is enabled.
This command has these states:
•
•
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spanning-tree portfast
spanning-tree portfast {disable | edge [trunk] | network | trunk}
no spanning-tree portfast
Disables PortFast on the interface.
Enables PortFast edge mode on the interface.
Enables PortFast network mode on the interface.
Enables PortFast on the interface even in the trunk mode.
Modification
Support for this command was introduced on the Supervisor Engine 720.
Support for this command on the Supervisor Engine 2 was extended to
Release 12.2(17d)SXB.
This command was integrated into Cisco IOS Release 12.2(33)SRA.
Added edge [trunk] and network keywords.
This command was integrated into 15.0(1)MR.
spanning-tree portfast—This command enables PortFast unconditionally on the given port.
spanning-tree portfast disable—This command explicitly disables PortFast for the given port. The
configuration line shows up in the running configuration because it is not the default.
Cisco MWR 2941 Router Command Reference, Release 15.0(1)MR
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