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 ...

Get Cisco CCNA Routing and Switching ICND2 200-101 Official Cert Guide now with O’Reilly online learning.

O’Reilly members experience live online training, plus books, videos, and digital content from 200+ publishers.