Forcibly bringing up a fiber port
As shown in Figure 2, a GE/10-GE/40-GE/100-GE port uses separate fibers for transmitting and receiving packets. The physical state of the fiber port is up only when both transmit and receive fibers are physically connected. If one of the fibers is disconnected, the fiber port does not work.
To enable a fiber port to forward traffic over a single link, you can use the port up-mode command. This command forcibly brings up a fiber port, even when no fiber links or transceiver modules are present for the fiber port. When one fiber link is present and up, the fiber port can forward packets over the link unidirectionally.
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 interfaces on the following interface modules:
EB interface module: LSU1TGX4EB0 (JC627A, JG386A).
EC interface module: LSUM1CGC2EC0 (JH196A, JH204A).
SC interface module: LSU1TGS16SC0 (JC628A).
SE interface modules:
LSU1TGX4SE0 (JC620A, JG379A).
LSU1TGS8SE0 (JC631A, JG389A).
LSU1CGC2SE0 (JG916A).
SF interface modules:
LSUM2TGS16SF0 (JH193A, JH201A).
LSU1TGS32SF0 (JC755A, JG344A).
LSU1QGS4SF0 (JC757A, JG346A).
LSU1TGS48SF0 (JC756A, JG345A).
LSU1QGS8SF0 (JG392A, JG393A).
LSU1QGC4SF0 (JG396A, JG397A).
10-GE interfaces on an LSU1GP24TXEB0 (JC626A, JG337A) module.
10-GE interfaces installed with a GE SFP transceiver module on an LSUM1TGS24EC0 (JH194A, JH202A) 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 |
2. Enter Ethernet interface view. | interface interface-type interface-number | Only GE fiber ports, 10-GE fiber ports, 40-GE fiber ports, and 100-GE fiber ports support this feature. Copper ports and combo interfaces do not support this feature. |
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. |