PortFast should only be enabled on ports connected to a single hosts connecting hubs, concentrators, switches, bridges, etc.to this interface when PortFast is enabled, can cause temporary spanning tree loops. Use with CAUTION
Enter configuration commands, one per line. End with CNTL/Z.
SwitchB(config)#interface fastethernet 5/4
%PortFast has been configured on FastEthernet5/4 but will only have effect when the interface is in a non-trunking mode.