4.1 User Interface Overview
The system supports console and VTY user interfaces.
Each user interface has a user interface view. A user interface view is a command line view
provided by the system. It is used to configure and manage all the physical and logical interfaces
in asynchronous mode.
User Interfaces Supported by the System
l Console port (CON)
The console port is a serial port provided by the main control board of the device.
The main control board provides one EIA/TIA-232 DCE console port. A terminal can use
this port to connect directly to a device in order to perform local configurations.
l Virtual type terminal (VTY)
A VTY is a logical terminal line. A VTY connection is set up when a device uses Telnet
to connect to a terminal by means of Telnet. This kind of connection is used for local or
remote access to a device. A maximum of 15 users can use the VTY user interface to log
in to the device.
l TTY
The TTY is used to manage and monitor login users.
The TTY mode uses the asynchronous serial port for login.
Numbering of a User Interface
After a user logs in to the device, the system assigns the lowest numbered idle user interface to
the user. The type of interface assigned depends on the user's login mode. There are two ways
to number user interfaces:
l Relative numbering
Relative numbering uses a user interface type + number format.
Relative numbering is used to specify user interfaces of a particular type. It can be used to
number single user interfaces or user interface groups and must adhere to the following
rules:
– Number of the console port: CON 0
– Number of the TTY: TTY 1 for the first line, TTY 2 for the second line, and so on
– Number of the VTY: VTY 0 for the first line, VTY 1 for the second line, and so on
l Absolute numbering
Absolute numbering is used to give a single user interface or a group of user interfaces a
unique number.
Absolute numbering starts with 0. Ports are numbered in a sequence beginning with
CON -> TTY -> VTY. There is only one console port and 0-20 VTY interfaces (VTY
interfaces 0 to 14 are reserved for Telnet/SSH users and VTY interfaces 16 to 20 are
reserved for network management users). You can use the user-interface maximum-vty
command to set the maximum number of user interfaces. The default number is five.
By default, the system supports three types of user interfaces: CON, TTY, and VTY.
Table 4-1 shows absolute numbers for user interfaces in this system.
Huawei AR1200 Series Enterprise Routers
Configuration Guide - Basic Configuration 4 Configuring User Interfaces
Issue 04 (2012-05-15) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
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