Allied Telesis AT-8100 Series - Manual (Page 187)

AT-8100 Switch Command Line User’s Guide
187
Setting the MDI/MDI-X Wiring Configuration
The wiring configurations of twisted pair ports that operate at 10 or 100
Mbps are MDI (medium dependent interface) and MDI-X (medium
dependent interface crossover). A port on the switch and a port on a link
partner must have different settings. For instance, a switch port has to be
using the MDI wiring configuration if the port on its link partner is using the
MDIX wiring configuration.
The command for setting the wiring configuration is the POLARITY
command in the Port Interface mode. Here is the format of the command:
polarity auto|mdi|mdix
The AUTO setting activates auto-MDI/MDIX, which enables a port to
detect the wiring configuration of its link partner so that it can set its wiring
configuration to the opposite setting.
This example of the command configures ports 22 and 23 to the MDI
wiring configuration:
awplus> enable
awplus# configure terminal
awplus(config)# interface port1.0.22,port1.0.23
awplus(config-if)# polarity mdi
This example activates auto-MDI/MDIX on ports 7 to 9:
awplus> enable
awplus# configure terminal
awplus(config)# interface port1.0.7-port1.0.9
awplus(config-if)# polarity auto
For reference information, refer to “POLARITY” on page 227.