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Usage guidelines
When a packet arrives at an interface, the device looks up the destination MAC address of the
packet in the MAC address table. If an entry is found and the outgoing interface is the same as the
incoming interface, the device drops the packet.
After you configure this command on the Ethernet interface, the device forwards such packets rather
than drop them.
Examples
# Enable bridging on Layer 2 Ethernet interface GigabitEthernet 1/0/1.
<Sysname> system-view
[Sysname] interface gigabitethernet 1/0/1
[Sysname-GigabitEthernet1/0/1] port bridge enable
port up-mode
Use port up-mode to forcibly bring up a fiber port.
Use undo port up-mode to restore the default.
Syntax
port up-mode
undo port up-mode
Default
Fiber ports are not forcibly brought up. The physical state of the fiber port is determined by the
physical state of the optical fibers.
Views
Ethernet interface view
Predefined user roles
network-admin
Usage guidelines
CAUTION:
The following operations on a fiber port will cause link updown events before the port finally stays up:
• Configure the port up-mode command and the speed or duplex command at the same time.
• Install or remove fiber links or transceiver modules after you forcibly bring up the fiber port.
You can use this command to forcibly bring up a fiber Ethernet port, and enable the port to forward
packets unidirectionally over a single link. In this way, transmission links are well utilized.
After you forcibly bring up an Ethernet fiber port, the fiber port stays physically up whether or not a
transceiver module or fiber connections are present for the port.
Copper ports do not support this command.
The port up-mode command is mutually exclusive with either of the shutdown commands.
A GE fiber port cannot correctly forward traffic if you configure the port up-mode command on the
port and install an electro-optical module, 100/1000-Mbps transceiver module, or 100-Mbps
transceiver module into the port. To solve the problem, use the undo port up-mode command on
the fiber port.
Examples
# Forcibly bring up the fiber port GigabitEthernet 1/0/1.
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