Overview of Interface Management

This section provides the physical and logical interfaces supported by the NetEngine 8000 F and describes the interface views and prompts and common link protocols and access technologies.

Interface Types

Devices exchange data and interact with other devices on a network through interfaces. Interfaces are classified into physical and logical interfaces.

Physical Interfaces

Physical interfaces physically exist on boards. They are divided into the following types:
- LAN interfaces: interfaces through which the router can exchange data with other devices on a LAN.
- WAN interfaces: interfaces through which the router can exchange data with remote devices on external networks.
Logical Interfaces

Logical interfaces are manually configured interfaces that do not exist physically. Logical interfaces can be used to exchange data.

The management network port of the main control board does not forward services.

Interface Views and Prompts

Table 1 lists the commands, views, and prompts of physical interfaces supported by the NetEngine 8000 F. Table 2 lists the commands, views, and prompts of logical interfaces supported by the NetEngine 8000 F.

**Table 1** Commands, views, and prompts of physical interfaces supported by the NetEngine 8000 F
Interface Name	Command View	Operation	Prompt
GE interface	GE interface view	Run the interface gigabitethernet 0/1/0 command in the system view.	[~HUAWEI-GigabitEthernet0/1/0]
10GE interface	10GE interface view	Run the interface gigabitethernet 0/1/0 command in the system view. NOTE: The interfaces marked with 10G displayed in the display interface brief command output indicate GE interfaces whose bandwidth is 10 Gbit/s.	[~HUAWEI-GigabitEthernet0/1/0]
25GE interface view	25GE interface view	Run the interface 25GE 0/1/0 command in the system view. Run the interface 25GE 0/1/28 command in the system view.	[~HUAWEI-25GE0/1/0] [~HUAWEI-25GE0/1/28]
40GE interface	40GE interface view	Run the interface 40GE 0/1/0 command in the system view. Run the interface 40GE 0/1/48 command in the system view.	[~HUAWEI-40GE0/1/0] [~HUAWEI-40GE0/1/48]
100GE interface	100GE interface view	Run the interface 100GE 0/1/0 command in the system view. Run the interface 100GE 0/1/48 command in the system view.	[~HUAWEI-100GE0/1/0] [~HUAWEI-100GE0/1/48]
400GE interface	400GE interface view	Run the interface 400GE 0/1/0 command in the system view.	[~HUAWEI-400GE0/1/0]
XGE interface	XGE interface view	Run the interface XGigabitEthernet 0/1/0 command in the system view.	[~HUAWEI-XGigabitEthernet0/1/0]
50GE interface	50GE interface view	Run the interface 50GE 0/1/0 command in the system view. Run the interface 50GE 0/1/48 command in the system view.	[~HUAWEI-50GE0/1/0] [~HUAWEI-50GE0/1/48]
FlexE-50G interface	FlexE-50G interface view	Run the interface FlexE-50G 0/1/0 command in the system view. Run the interface FlexE-50G 0/1/48 command in the system view.	[~HUAWEI-FlexE-50G0/1/0] [~HUAWEI-FlexE-50G0/1/48]
FlexE-100G interface	FlexE-100G interface view	Run the interface FlexE-100G 0/1/0 command in the system view. Run the interface FlexE-100G 0/1/48 command in the system view.	[~HUAWEI-FlexE-100G0/1/0] [~HUAWEI-FlexE-100G0/1/48]
FlexE-400G interface	FlexE-400G interface view	Run the interface FlexE-400G 0/1/0 command in the system view.	[~HUAWEI-FlexE-400G0/1/0]

**Table 2** Commands, views, and prompts of logical interfaces
Interface Name	Command View	Operation	Prompt
Sub-interface	Sub-interface view	Run the interface gigabitethernet 0/1/0.1 command in the system view.	[~HUAWEI-GigabitEthernet0/1/0.1]
Eth-Trunk interface	Eth-Trunk interface view	Run the interface eth-trunk 2 command in the system view.	[~HUAWEI-Eth-Trunk2]
VE interface	VE interface view	Run the interface virtual-ethernet 0/1/0 command in the system view.	[~HUAWEI-Virtual-Ethernet0/1/0]
Global-VE interface	Global VE interface view	Run the interface global-ve 0/1/0 command in the system view.	[~HUAWEI-Global-VE0/1/0]
VLANIF interface	VLANIF interface view	Run the interface vlanif 2 command in the system view.	[~HUAWEI-Vlanif2]
Loopback interface	Loopback interface view	Run the interface loopback 2 command in the system view.	[~HUAWEI-LoopBack2]
Null interface	Null interface view	Run the interface null 0 command in the system view.	[~HUAWEI-NULL0]
Tunnel interface	Tunnel interface view	Run the interface tunnel 2 command in the system view.	[~HUAWEI-Tunnel 2]
FlexE interface	FlexE interface view	Run the interface FlexE 0/1/129 command in the system view.	[~HUAWEI-FlexE0/1/129]
PW-VE interface	PW-VE interface view	Run the interface pw-ve 1 command in the system view.	[~HUAWEI-pw-ve1]

Commonly-used Link Protocols and Access Technologies

The link layer is responsible for accurately sending data from a node to a neighboring node. It receives packets from the network layer, encapsulates the packets in frames, and then sends the frames to the physical layer.

Major link layer protocols supported by the NetEngine 8000 F are listed as follows:

Ethernet

Currently, the LAN mostly refers to the Ethernet. The Ethernet is a broadcast network, which is flexible and simple in configuration as well as easy to expand. For these reasons, the Ethernet is widely used.
Trunk

The trunk technology has the following advantages:
- Bandwidth increase: The bandwidth of a trunk is the total bandwidth of all member interfaces.
- Reliability enhancement: When a link fails, other links in the same trunk automatically take over the services on the faulty link to prevent traffic interruption.

Interface Flapping Control

The status of an interface on a device may alternate between up and down for various reasons, including physical signal interference and incorrect link layer configurations. The changing status causes Multiprotocol Label Switching (MPLS) and routing protocols to flap. As a result, the device may break down, causing network interruption. Control-flap controls the frequency of interface status alternations between up and down to minimize the impact on device and network stability.

The following two control modes are available.

**Table 3** Flapping control modes
Control Mode	Function	Usage Scenario
control-flap	Controls the frequent flappings of interfaces at the network layer to minimize the impact on device and network stability.	This control mode is interface-specific. This control mode suppresses interface flappings from the network layer and reports the flappings to the routing management module, thereby improving network-layer stability. This control mode allows you to precisely configure parameters based on service requirements. This control mode involves complex algorithms and is highly demanding to use.
damp-interface	Controls the frequent flappings of interfaces at the physical layer to minimize the impact on device and network stability.	This function is supported globally or on a specified interface. This control mode suppresses the flappings from the physical layer, thereby improving link-layer and network-layer stability. This control mode prevents the upper-layer protocols from frequently alternating between enabled and disabled, thereby reducing the consumption of CPU and memory resources. This control mode does not involve any complex algorithms and is easy to use.