What can I do if the electrical interfaces connected by a network cable cannot be Up

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Before checking a link, check whether the LINK indicator of the interface is on. If the indicator is on, it indicates that the physical link is Up and you can detect the link as follows:

1.Check whether either of the interfaces is shut down. If an interface is shut down, run the undo shutdown command on it.
2.If the shutdown command is not used, check whether either of the two connected optical interfaces is the combo interface. If yes, run the display this interface command to check whether the interface is FORCE COPPER. If not, run the combo-port copper command on the switch to change the interface to the forcible electrical interface.
[HUAWEI-GigabitEthernet0/0/1] display this interface
......
Port Mode: FORCE COPPER
Speed : 0, Loopback: NONE
Duplex: HALF, Negotiation: ENABLE
Mdi : AUTO
......
3.If the two interfaces are both electrical interfaces but cannot be Up, check whether the auto-negotiation status, rates, and duplex modes on the two interfaces are the same. If they are different, set them to be the same.
4.If the problem persists, check the MDI modes of the interfaces. If you do not know the type of the network cable, set auto mode on the two interfaces. If the interfaces are still Down, contact Huawei technical support engineers.

Other related questions:
Problem and solution when the electrical port of the firewall is down
What if the electrical port of the USG is not Up? 1. Check whether the faulty port is disabled. If yes, run the undo shutdown command to enable the port. 2. Remove the network cable: -Check whether the gold pin of the interface is bent or deviates. -Check whether the network cable is disconnected or damaged. -Check the type of the network cable. A GE electrical port fails to go Up if a network cable lower than category 5 cable is used. -A GE electrical interface may fail to go Up if some wires among the four wire pairs in the network cable are damaged. 3. Auto-negotiation shall be configured on both ports, and the rates and duplex modes on both ports shall be the same. 4. Incorrect MDI setting: -The current device can automatically identify straight cables or crossover cables, and MDI is usually not required.

How to do if the optical interfaces connected by a fiber cannot be Up
Before checking a link, check whether the LINK indicator of the interface is on. If the indicator is on, the physical link is normal. Perform the following steps: 1.Check whether either of the interfaces is shut down. If an interface is shut down, run the undo shutdown command on it. 2.If the shutdown command is not used, check whether either of the two connected optical interfaces is the combo interface. If yes, run the display this interface command to check whether the interface is FORCE FIBER. If not, run the combo-port fiber command to change the interface to the forcible optical interface. [HUAWEI-GigabitEthernet0/0/1] display this interface ...... Port Mode: FORCE FIBER Speed : 1000, Loopback: NONE Duplex: FULL, Negotiation: ENABLE Mdi : NORMAL ...... 3.If the two interfaces are both optical interfaces but cannot be Up, it is possible that one interface is an FE interface and the other is a GE interface. In this case, you need to disable auto-negotiation on the GE interface, set the operation mode of the GE interface to 100 Mbit/s, and set the duplex mode to full duplex. Check whether the interfaces become Up. If they are still Down, contact Huawei technical support engineers. 4.If the two interfaces are both GE interfaces, check whether the auto-negotiation status, rates, and duplex modes on the two interfaces are the same. If they are different, set them to be the same. 5.If the interfaces are still Down, ensure that input optical power on each interface is within the receiver sensibility of the interface. 6.If the problem persists, contact Huawei technical support engineers. NOTE: The status of a physical interface is not affected by the service configuration.

The state of an E1 interface is not Up when the interface interconnects with the peer device
For the problem that the state of an E1 interface of an AR router is not Up when the interface interconnects with other devices, see the troubleshooting guide. For details, access the URL in the right column.

An electrical port of a WLAN device cannot go Up
1. After a 100M/1000M electrical port on a WLAN device is connected to a port on the peer device, configure the electrical port to work in auto-negotiation mode. 2. If the fault persists, check whether the port on the peer device works in auto-negotiation mode. 3. If the port still cannot go Up when a Huawei WLAN device is connected to a non-Huawei WLAN device, configure ports on both devices to work in forcible mode. 4. If the fault persists, perform a loopback test by connecting the electrical port to another port on the same card on the Huawei device using an Ethernet cable. - If the electrical port goes Up, the peer device may be faulty. Contact the vendor of the peer device to rectify the fault. - If the fault persists, connect the Ethernet cable to another port on the same card. If the electrical port still cannot go Up, the card is faulty. Contact Huawei technical support personnel to rectify the fault.

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