What is the default working mode of a combo port and the command used to set its working mode

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A combo port can work either as an optical port or an electrical port.

By default, a combo interface works in auto mode.

You can run the combo-port { auto| copper| fiber } command in the interface view to set the working mode of a combo port. In the command, auto allows a combo port to automatically select the working mode, copper configures a combo port to work as an electrical port, and the fiber configures a combo port to work as an optical port.

Other related questions:
Configuring the Combo interface on the firewall
The optical and electrical combo ports cannot be simultaneously used on the firewall. Note: By default, the combo port works as the electrical port. To use the combo port as the optical port, you must configure as follows to specify its working status: Example for configuring the combo port of the USG2000&5000&6000: system-view [USG] interface GigabitEthernet 0/0/1 //Access the combo port view. [USG-GigabitEthernet0/0/1] combo enable { copper | fiber | 100base-fx | 1000base-x } //Configure the working status of the combo port. Note: The configuration commands on different devices are different. Select a working status for the combo port as required. fiber: indicates that the combo port works as an optical port. The USG5500/USG6000 series supports this configuration. copper: indicates that the combo port works as an electrical port. 100base-fx: 100 Mbit/s optical port. Only the USG2110-X/2100/2200/5100 and USG2100/2200/5100 BSR/HSR support this configuration. 1000base-x: 1000 Mbit/s optical port. Only the USG2110-X/2100/2200/5100 and USG2100/2200/5100 BSR/HSR support this configuration.

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.

What is the default STP mode for S series switches
For S (except the S1700) and E series switches, STP works in MSTP mode by default.

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.

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