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Setting the MDIX mode of an Ethernet interface
IMPORTANT:
Fiber ports do not support the MDIX mode setting.
A physical Ethernet interface has eight pins, each of which plays a dedicated role. For example, pins
1 and 2 transmit signals, and pins 3 and 6 receive signals. You can use both crossover and
straight-through Ethernet cables to connect copper Ethernet interfaces. To accommodate these
types of cables, a copper Ethernet interface can operate in one of the following Medium Dependent
Interface-Crossover (MDIX) modes:
• MDIX mode—Pins 1 and 2 are receive pins and pins 3 and 6 are transmit pins.
• MDI mode—Pins 1 and 2 are transmit pins and pins 3 and 6 are receive pins.
• AutoMDIX mode—The interface negotiates pin roles with its peer.
NOTE:
This feature does not take effect on pins 4, 5, 7, and 8 of physical Ethernet interfaces.
• Pins 4, 5, 7, and 8 of interfaces operating at 10 Mbps or 100 Mbps do not receive or transmit
signals.
• Pins 4, 5, 7, and 8 of interfaces operating at 1000 Mbps or higher rates receive and transmit
signals.
To enable a copper Ethernet interface to communicate with its peer, set the MDIX mode of the
interface by following these guidelines:
• Typically, set the MDIX mode of the interface to AutoMDIX. Set the MDIX mode of the interface
to MDI or MDIX only when the device cannot determine the cable type.
• When a straight-through cable is used, configure the interface to operate in an MDIX mode
different than its peer.
• When a crossover cable is used, perform one of the following tasks:
{ Configure the interface to operate in the same MDIX mode as its peer.
{ Configure either end to operate in AutoMDIX mode.
To set the MDIX mode of an Ethernet interface:
Step Command Remarks
1. Enter system view.
system-view
N/A
2. Enter Ethernet interface
view.
interface
interface-type
interface-number
N/A
3. Set the MDIX mode of the
Ethernet interface.
mdix-mode
{
automdix
|
mdi
|
mdix
}
By default, a copper Ethernet
interface operates in auto mode to
negotiate pin roles with its peer.
10-GE interfaces support only the
automdix
mode.
Testing the cable connection of an Ethernet interface
IMPORTANT:
If the link of an Ethernet interface is up, testing its cable connection will cause the link to go down
and then come up.
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