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Fat AP and Cloud AP V200R008C00 CLI-based Configuration Guide

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User Interface Overview

User Interface Overview

The system supports the console and VTY user interfaces.

Each user interface maps a user interface view. In the user interface view that is a command-line interface (CLI), you can configure and manage all physical and logical interfaces that work in asynchronous and interactive modes to manage different user interfaces.

User Interfaces Supported by the Device

  • Console (CON)

    The console port is a serial port provided by the main control board of a device.

    Each main control board provides one console port that conforms to the EIA/TIA-232 standard. The console port is a Data Connection Equipment (DCE) port. The serial port of a user terminal can directly connect to the console port of the device to access the device.

  • VTY

    The Virtual Type Terminal (VTY) manages and monitors users who log in to the device using VTY user interfaces

    When a user's terminal connects to the device using Telnet or Secure Shell (SSH), a VTY is set up. A maximum of 15 users can log in to the device using VTY interfaces at the same time.

Relationship Between a User and a User Interface

A user interface is not devoted exclusively to a specific user. User interfaces are used to manage and monitor users that have logged in to the system using a certain method. Although a user interface can be used only by one user at a time, a user interface is not specific to a fixed user.

When a user logs in to the device, the system assigns an available user interface with the smallest number to the user. The login process depends on the configuration of the user interface. For example, when user A logs in to the device using the console port, the login process depends on the configuration in the console user interface view. If a user logs in to the device in different modes, the user interface assigned to the user is different. If a user logs in to the device at different time, the user interface assigned to the user may be different.

User Interface Number

When a user logs in to the device, the system assigns an available user interface with the smallest number to the user. User interfaces can be numbered in either of the following ways:

  • Relative numbering

    The format of relative numbering is: user interface type + number.

    Relative numbering uniquely specifies a user interface of the same type. Relative numbering must comply with the following rules:

    • Number of the CON port: CON 0

    • Number of the VTY: The first VTY is 0, the second VTY is 1, and so on

  • Absolute numbering

    Absolute numbering uniquely specifies a user interface or a group of user interfaces. You can run the display user-interface command to view user interfaces and their absolute numbers supported by the current device.

    There is only one console port on a main control board. 15 VTY user interfaces are provided. You can use the user-interface maximum-vty command in the system to set the maximum number of user interfaces. By default, the maximum number of user interfaces is 5.

    Table 3-13 describes the default absolute numbering of the console user interface and VTY user interface.

Table 3-13  Absolute and relative numbers of user interfaces

User Interface

Description

Absolute Number

Relative Number

Console user interface

Manages and controls users that log in to the device using the console interface.

0

0

VTY user interface

Manages and controls users that log in to the device using Telnet or SSH.

5 to 19

The first interface is VTY 0, the second is VTY 1, and so forth. By default, VTY 0 to VTY 4 are available.

Absolute numbers 5 to 19 map relative numbers VTY 0 to VTY 14.

User Authentication Modes on a User Interface

After a user authentication mode is configured, the device authenticates users who want to log in.

Two authentication modes are available:

  • Password authentication: A user is authenticated only by password.
  • AAA authentication: A user is authenticated by user name and password. Telnet users usually use AAA authentication.

User Levels on User Interfaces

Users log in to the device are managed based on the user levels. The level of commands that a user can use depends on the level of the user.

  • In the password authentication mode, the level of commands that the user can run depends on the level of the user interface.
  • In the AAA authentication mode, the level of commands that the user can run depends on the level of the local user specified in AAA configuration.
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Updated: 2019-01-11

Document ID: EDOC1000176006

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