How to configure a combo interface to work as an optical interface or electrical interface

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By default, a combo interface works in the auto mode. The combo interface automatically works as an optical interface or electrical interface.
-If a network cable is not connected to the interface, the combo interface works as an optical interface when an optical module is installed on the interface.
-If a network cable is connected to the interface and the interface is in Up state, the combo interface works as an electrical interface when an optical module is installed on the interface.
-If a network cable is connected to the interface and the interface is in Down state, the combo interface works as an optical interface when an optical module is installed on the interface.
-If a network cable, an optical module, and an optical fiber are installed on the interface, the combo interface works as an optical interface after the device restarts.
You are advised to run the combo-port { fiber | copper } command to forcibly configure the combo interface to work as an electrical interface or optical interface.

If a combo interface is forcibly configured to work in a different mode from a remote interface, the two interfaces cannot communicate.

Other related questions:
How to configure the work mode of the Combo interface of an AR router
Combo interfaces are optical-electrical multiplex Ethernet interfaces. The optical interface and the electrical interface of the combo interface cannot work at the same time. Note: Combo interfaces work in electrical interface mode by default. If you want to use the optical interface of the Combo interface, you must configure the Combo interface as follows to set it to optical interface mode. 1. Run the system-view command to enter the system view. 2. Run the interface gigabitethernet [interface-number] command to enter the view of the GigabitEthernet interface. 3. Run the combo-port { auto | copper | fiber } command to configure the work mode of the Combo interface. auto: Indicates the work mode is selected automatically. The device detects the state of the interfaces and select the work mode as follows: - If the state of the electrical interface becomes Up first, electrical interface mode is selected. - If the state of the optical interface becomes Up first, optical interface mode is selected. copper: Indicates that the work mode of the Combo interface is set to electrical interface mode by force, that is, data is transmitted through network cables. fiber: Indicates that the work mode of the Combo interface is set to optical interface mode by force, that is, data is transmitted through optical fibers.

How to configure the working mode of a combo interface
You can run the combo-port { auto | copper | fiber } command to configure the working mode of a combo interface. By default, a combo interface works in auto mode, in which the combo interface automatically works as an optical or electrical interface. -When the auto mode is specified, the system checks whether the combo optical interface has an optical module installed, and selects the interface working mode as follows: -When the electrical interface is not connected, the combo interface works as an optical interface if the combo optical interface has an optical module installed. -When the electrical interface is connected using a network cable and the combo interface is Up, the combo interface works as an electrical interface even if the combo optical interface has an optical module installed. However, the combo interface works as an optical interface after the device restarts. -When the electrical interface is connected using a network cable and the combo interface is Down, the combo interface works as an optical interface if the combo optical interface has an optical module installed. In summary, when the auto mode is specified and the combo optical interface has an optical module installed, the combo interface works as an optical interface after the device restarts. -You can forcibly specify the working mode of the combo interface based on the remote interface type. If the local combo electrical interface is connected to a remote electrical interface, configure the combo interface to work in copper mode. If the local combo optical interface is connected to a remote optical interface, configure the combo interface to work in fiber mode.

Why an interface can be configured as both optical and electrical interfaces
When a 1000M optical interface connects to an electrical module, it works as an electrical interface. However, the interface retains the configuration of the optical interface. When configuration is performed on the electrical interface, the interface has the configurations of both optical and electrical interfaces. When you remove the electrical module and connect the 1000M optical interface to an optical module, the 1000M optical interface works as an optical interface. However, the interface retains the configuration of the electrical interface. The configurations of optical and electrical interfaces do not conflict. Before deleting the electrical interface configuration from the 1000M optical interface, you must connect the 1000M optical interface to an electrical module. A combo interface is a multiplexing interface and can connect to optical or electrical media. You can differentiate the physical configuration including the rate, duplex mode, auto-negotiation, and flow control according to port media type fiber/copper in the configuration file. By default, a combo interface adapts to the optical or electrical media. The media configuration is delivered automatically to the combo interface and the combo interface configuration and the media configuration do not conflict. Before deleting the media configuration, switch the combo interface to work in media mode. NOTE: You can run the combo-port { copper | fiber } command to configure the interface to work as an electrical or optical interface. If the combo interface works as an electrical interface, run the combo-port fiber command to configure the interface to work as an optical interface. If the combo interface switches to another operation mode, the original configuration exits but does not work.

Whether USG2250 interfaces are combo interfaces
Yes. Two combo interfaces are available.

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