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Figure 2 Forcibly bring up a fiber port
Configuration restrictions and guidelines
When you forcibly bring up a fiber port, follow these restrictions and guidelines:
• This feature is not supported on 10-GE interfaces on the LSQ1TGS8SC0 or LSQ1GP24TXSD0
interface module.
• For fiber ports connected to the same physical link to operate correctly, you must configure this
feature for both of them.
• The port up-mode, shutdown, and loopback commands are mutually exclusive.
• Either of the following operations on an interface forcibly brought up will cause the interface to
go down before staying physically up:
{ Configure the speed and duplex commands on the interface.
{ Remove and install fibers or transceiver modules.
• A GE fiber port forcibly brought up cannot correctly forward traffic if it is installed with a
fiber-to-copper converter, 100/1000-Mbps transceiver module, or 100-Mbps transceiver module.
To solve the problem, use the undo port up-mode command on the fiber port.
Configuration procedure
To forcibly bring up a fiber port:
Step Command Remarks
1. Enter system view.
system-view
N/A
Correct fiber
connection
When Ethernet interfaces
cannot be or are not forcibly
brought up
When Ethernet interfaces
are forcibly brought up
Fiber port Tx end Rx end The fiber is disconnected.Fiber link
Device A
Device B
Device A
Device B
Device A
Device B
The interface is down.Packets
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