H3C Technologies H3C S12500 Series Switches - Manual (Page 24)

16
Step Command Remarks
60. Configure the MDI mode of
the Ethernet interface.
mdi { across | auto | normal }
Optional.
The default is auto. The switch
decides the role of the pins (to send
packets or receive packets)
through auto negotiation.
Forcibly bringing up an Ethernet interface
As shown in Figure 2 , a fiber port uses separate wires for transmitting and receiving packets. The
physical state is up only when both transmit and receive fibers are present. If one of the fibers is
disconnected, the fiber port does not work.
To enable a fiber port to perform one-way forwarding when only one fiber is present, you can use the
port up-mode command. This command brings up an Ethernet fiber port by force, even when no fiber
links or transceiver modules are present. If one fiber link is present and up, the fiber port can forward
packets over the link unidirectionally.
Figure 2 Forcibly bring up an Ethernet interface
Configuration restrictions and guidelines
• Only the general GE fiber port and the 10-GE fiber port operating in LAN mode can be forcibly
brought up. Copper ports and combo interfaces do not support this function.
• The port up-mode command cannot be used together with any of the shutdown, speed, duplex, or
loopback commands.