The portfast feature basically tells the switch ONLY host devices will be attached to this interface and as a result the stp can be bypassed and the interface can be put straight into a forwarding state.
So in summary portfast = end users/servers/printers etc.. - anything but hubs or switches.
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kind regards Paul
Please rate and mark posts accordingly if you have found any of the information provided useful. It will hopefully assist others with similar issues in the future
Most of it is added by Pdriver, just to make one note irrespective of switches the concept of Portfast remains the same.
The simple explanation is that PortFast will immediately transition a port to the forwarding state and not attempt to detect a switching loop unless a BPDU is received on the port with PortFast enabled. So plugging in multiple links on hubs, switches or bridges to the network can temporary switching loops.
Another major advantage of PortFast is that a TCN (Topology Change Notification) is not generated by spanning-tree each time a port goes up or down. This conserves resources as spanning-tree does not have to reprocess the tree every time a TCN is generated.
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