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PowerConnect B-Series FCX Configuration Guide 37
53-1002266-01
Configuring basic port parameters
2
• 100-half
• auto (default)
Configuring MDI/MDIX
Dell PowerConnect devices support automatic Media Dependent Interface (MDI) and Media
Dependent Interface Crossover (MDIX) detection on all Gbps Ethernet Copper ports.
MDI/MDIX is a type of Ethernet port connection using twisted pair cabling. The standard wiring for
end stations is MDI, whereas the standard wiring for hubs and switches is MDIX. MDI ports
connect to MDIX ports using straight-through twisted pair cabling. For example, an end station
connected to a hub or a switch uses a straight-through cable. MDI-to-MDI and MDIX-to-MDIX
connections use crossover twisted pair cabling. So, two end stations connected to each other, or
two hubs or switches connected to each other, use crossover cable.
The auto MDI/MDIX detection feature can automatically correct errors in cable selection, making
the distinction between a straight-through cable and a crossover cable insignificant.
Configuration notes
• This feature applies to copper ports only.
• The mdi-mdix mdi and mdi-mdix mdix commands work independently of auto-negotiation.
Thus, these commands work whether auto-negotiation is turned ON or OFF.
• Do not use the mdi-mdix commands on ports that are manually configured with a speed and
duplex of 100-full. In this case, make sure the other port (remote end of the connection) is
also configured to 100-full and a cross-over cable is used if the connected device is another
switch, hub, or router, or a straight-through cable if the connected device is a host NIC.
Configuration syntax
The auto MDI/MDIX detection feature is enabled on all Gbps copper ports by default. For each
port, you can disable auto MDI/MDIX, designate the port as an MDI port, or designate the port as
an MDIX port.
To turn off automatic MDI/MDIX detection and define a port as an MDI only port.
PowerConnect(config-if-e1000-2)# mdi-mdix mdi
To turn off automatic MDI/MDIX detection and define a port as an MDIX only port.
PowerConnect(config-if-e1000-2)# mdi-mdix mdix
To turn on automatic MDI/MDIX detection on a port that was previously set as an MDI or MDIX port.
PowerConnect(config-if-e1000-2)# mdi-mdix auto
Syntax: mdi-mdix <mdi | mdix | auto>
After you enter the mdi-mdix command, the Dell PowerConnect device resets the port and applies
the change.
To display the MDI/MDIX settings, including the configured value and the actual resolved setting
(for mdi-mdix auto), enter the command show interface at any level of the CLI.