Setting The Mdix Mode Of An Ethernet Interface - H3C S12500 Series Interface Configuration Manual

After you forcibly bring up a fiber Ethernet port, the fiber port stays physically up regardless of
•
whether or not an optical module or a fiber connection is present for the port.
The fiber port cannot properly forward traffic if you install a transceiver module, 100/1000-Mbps
•
transceiver module, or 100-Mbps transceiver module into the port and configure the port up-mode
command. To solve the problem, use the undo port up-mode command on the fiber port.
Configuration procedure
To forcibly bring up a fiber GE or 10-GE port:
Step
1. Enter system view.
2. Enter fiber GE or 10-GE
port view.
3. Forcibly bring up the fiber
GE or 10-GE port.

Setting the MDIX mode of an Ethernet interface

NOTE:
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:
• Generally, 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
1. Enter system view.
Command
system-view
interface interface-type
interface-number
port up-mode
Command
system-view
9
Remarks
N/A
N/A
By default, a fiber Ethernet port is not
forcibly brought up, and the physical state
of a fiber port depends on the physical
state of the fibers.
Remarks
N/A