Setting the MDIX mode of an Ethernet interface
![[IMPORTANT: ]](images/important.png) | IMPORTANT: Fiber ports do not support the MDIX mode setting. | |
A physical Ethernet interface comprises 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.
To enable the interface to communicate with its peer, set the MDIX mode of the interface mode by using the following 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, set the interface to operate in the MDIX mode different than its peer.
When a crossover cable is used, set the interface to operate in the same MDIX mode as its peer, or set 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. |