Cisco MWR 2941 Installation Manual download pdf (Page 658)

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Cisco MWR 2941 Mobile Wireless Edge Router Release 3.5 Command Reference, Cisco IOS Release 15.1(3)MR

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Chapter Cisco MWR 2941 Router Command Reference, Release 15.1(3)MR

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.

spanning-tree portfast

spanning-tree portfast {disable | edge [trunk] | network | trunk}

no spanning-tree portfast

Syntax Description

Command Default The settings that are configured by the spanning-tree portfast default command.

Command Modes Interface configuration (config-if)

Command History

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:

• 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.

disable Disables PortFast on the interface.

edge Enables PortFast edge mode on the interface.

network Enables PortFast network mode on the interface.

trunk Enables PortFast on the interface even in the trunk mode.

Release Modification

12.2(14)SX Support for this command was introduced on the Supervisor Engine 720.

12.2(17d)SXB Support for this command on the Supervisor Engine 2 was extended to

Release 12.2(17d)SXB.

12.2(33)SRA This command was integrated into Cisco IOS Release 12.2(33)SRA.

12.2(33)SXI Added edge [trunk] and network keywords.

15.0(1)MR This command was integrated into 15.0(1)MR.

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