Configuring auto-MDIX (CLI)

The auto-MDIX features apply only to copper port switches using twisted-pair copper Ethernet cables. For information about auto-MDIX, see Configuring auto-MDIX.

Syntax:


interface <port-list> mdix-mode < {auto-mdix | mdi | mdix>}

`auto-mdix`	The automatic,default setting. This configures the port for automatic detection of the cable (either straight-through or crossover).
`mdi`	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`	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.

The show interfaces config displays the following data when port A1 is configured for auto-mdix, port A2 is configured for mdi, and port A3 is configured for mdix:

Displaying the current MDI configuration

switch(config)# show interfaces config

 Port Settings

  Port   Type      | Enabled Mode         Flow Ctrl MDI
  ------ --------- + ------- ------------ --------- ---- 
  A1     10GbE-T   | Yes     Auto         Disable   Auto 
  A2     10GbE-T   | Yes     Auto         Disable   MDI 
  A3     10GbE-T   | Yes     Auto         Disable   MDIX 
  A4     10GbE-T   | Yes     Auto         Disable   Auto 
  A5     10GbE-T   | Yes     Auto         Disable   Auto 
  A6     10GbE-T   | Yes     Auto         Disable   Auto 
  A7     10GbE-T   | Yes     Auto         Disable   Auto 
  A8     10GbE-T   | Yes     Auto         Disable   Auto

Displaying the current MDI operating mode

switch(config)# show interfaces brief

 Status and Counters - Port Status

                   | Intrusion                           MDI  Flow Bcast
  Port   Type      | Alert     Enabled Status Mode       Mode Ctrl Limit
  ------ --------- + --------- ------- ------ ---------- ---- ---- ----- 
  A1     10GbE-T   | No        Yes     Up     1000FDx    MDIX off  0
  A2     10GbE-T   | No        Yes     Down   10GigFD    MDI  off  0
  A3     10GbE-T   | No        Yes     Down   10GigFD    MDIX off  0
  A4     10GbE-T   | No        Yes     Down   10GigFD    Auto off  0
  A5     10GbE-T   | No        Yes     Down   10GigFD    Auto off  0
  A6     10GbE-T   | No        Yes     Down   10GigFD    Auto off  0
  A7     10GbE-T   | No        Yes     Down   10GigFD    Auto off  0
  A8     10GbE-T   | No        Yes     Down   10GigFD    Auto off  0