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Figure 2 Forcibly bring up a fiber port
Restrictions and guidelines
• The port up-mode and shutdown commands are mutually exclusive.
• A fiber port does not support this feature if the port is shut down by a protocol or by using the
shutdown command.
• A fiber port does not support this feature if the port joins an aggregation group.
• A fiber port forcibly brought up stays physically up whether or not a transceiver module or a fiber
link is present for the port.
• 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.
Procedure
1. Enter system view.
system-view
2. Enter Ethernet interface view.
interface interface-type interface-number
3. Forcibly bring up the fiber port.
port up-mode
By default, a fiber port is not forcibly brought up, and the physical state of a fiber port depends
on the physical state of the fibers.
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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