How Do I Identify Combo Interfaces of a Switch?

A combo interface is a dual-purpose interface consisting of an Ethernet optical interface and an Ethernet electrical interface on the panel. The electrical and optical interfaces of a combo interface are multiplexed, and only one of them can work at a time.

NOTE:

In V100R003 and earlier versions, a combo interface works as an optical interface by default.

In V100R005 and later versions, a combo interface works in auto mode by default and automatically determines the interface type depending on whether the optical interface has an optical module installed:

• If the optical interface has no optical module installed and the electrical interface has no network cable connected, the interface type depends on which interface is connected first. If the electrical interface is connected by a network cable first, the electrical interface is used for data switching. If the optical interface has an optical module installed first, the optical interface is used for data switching.
• If the electrical interface has a network cable connected and is in Up state, the electrical interface is still used for data switching when the optical interface has an optical module installed.
• If the optical interface has an optical module installed and is in Up state, the optical interface is still used for data switching when the electrical interface has a network cable connected.
• If the optical interface has an optical module installed (with optical fibers connected) and the electrical interface has a network cable connected, the optical interface is used for data switching after the switch restarts.

You can use the combo-port command to configure a combo interface to work as an electrical or optical interface.

You can use the following methods to identify a combo interface on a switch:

• Identify a combo interface based on the interface identifier on the switch panel. If two interfaces have the same ID but connect to different transmission media, the two interfaces are multiplexed as a combo interface.
  
  
• Run the display interface command to check whether an interface is a combo interface.

  <HUAWEI> display interface gigabitethernet 1/0/1

  ...

  IP Sending Frames' Format is PKTFMT_ETHNT_2, Hardware address is 0025-9e80-2494

  Port Mode: COMBO AUTO

  Speed : 100,  Loopback: NONE

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