Port Status and Basic Configuration
Viewing Port Status and Configuring Port Parameters
Table 10-1. Cable Types for Auto and Manual MDI/MDI-X Settings
MDI/MDI-X Device Type
Setting PC or Other MDI Device Type Switch, Hub, or Other MDI-X Device
Manual MDI Crossover Cable Straight-Through Cable
Manual MDI-X Straight-Through Cable Crossover Cable
Auto-MDI-X
(The Default)
Either Crossover or Straight-Through Cable
The Auto-MDIX features apply only to copper port switches using twisted-pair
copper Ethernet cables.
Syntax: interface < port-list > mdix-mode < automdix | mdi | mdix >
automdix is the automatic, default setting. This configures the
port for automatic detection of the cable (either straight-through
or crossover).
mdi is the manual mode setting that configures the port for
connecting to either a PC or other MDI device with a crossover
cable, or to a switch, hub, or other MDI-X device with a straight-
through cable.
mdix is the manual mode setting that configures the port for
connecting to either a switch, hub, or other MDI-X device with
a crossover cable, or to a PC or other MDI device with a straight-
through cable.
Syntax: show interfaces config
Lists the current per-port Auto/MDI/MDI-X configuration.
Syntax: show interfaces brief
Where a port is linked to another device, this command lists the
MDI mode the port is currently using. In the case of ports
configured for Auto (auto-mdix), the MDI mode appears as either
MDI or MDIX, depending upon which option the port has
negotiated with the device on the other end of the link. In the
case of ports configured for MDI or MDIX, the mode listed in this
display matches the configured setting. If the link to another
device was up, but has gone down, this command shows the last
operating MDI mode the port was using. If a port on a given
switch has not detected a link to another device since the last
reboot, this command lists the MDI mode to which the port is
currently configured.
For example, show interfaces config displays the following data when port 1 is
configured for auto-mdix, port 2 is configured for mdi, and port 3 is configured
for mdix.
10-13
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