Dell Networking 7048 Reference Manual page 780

Example
The following example discards BPDUs received on spanning-tree ports in
portfast mode.
console#spanning-tree portfast bpdufilter default
spanning-tree portfast default
Use the spanning-tree portfast default command to enable Portfast mode
only on access ports. Use the no form of this command to disable Portfast
mode on all ports.
Syntax
spanning-tree portfast default
no spanning-tree portfast default
Default Configuration
Portfast mode is disabled by default.
Command Mode
Global Configuration mode
Usage Guidelines
This command only applies to access ports.
This command should be used with care. An interface with
NOTE:
PortFast mode enabled is moved directly to the spanning tree forwarding
state when linkup occurs without waiting for the standard forward-time delay.
Setting a port connected to another switch into PortFast mode may cause an
accidental topology loop and disrupt switch and network operations.
Example
The following example enables Portfast mode on all access ports.
console(config)#spanning-tree portfast default
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Spanning Tree Commands