Port Types
Cisco Catalyst switches determine the RSTP port type based on two port settings: the current duplex (full or half) and whether the PortFast feature is enabled. First, full duplex tells the switch to use port type point-to-point, with half duplex telling the switch to use port type shared. Enabling PortFast tells the switch to treat the port as an edge port. Table B-5 summarizes the combinations.
Table B-5 RSTP Port Types
You can easily find the RSTP port types in the output of several commands, including the same show spanning-tree command in Example B-6. Example B-6 lists output from switch SW2, with a hub added off SW2’s F0/18 ...
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