H3C Technologies H3C S12500 Series Switches - Manual (Page 61)

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Configuring user interfaces
The switch uses user interfaces (also called "lines") to control CLI logins and monitor CLI sessions. You
can configure access control settings, including authentication, user privilege, and login redirect on the
user interfaces. After users are logged in, their actions must be compliant with the settings on the user
interfaces assigned to them.
Users are assigned different user interfaces, depending on their login methods, as shown in
Table 14 .
Table 14 CLI login method and user interface matrix
User interface Login method
Console user interface Console port (EIA/TIA-232 DCE)
AUX user interface
AUX port (EIA/TIA-232 DTE, typically used for dial-in access through
modems)
VTY user interface Telnet or SSH
The switch supports at most 16 concurrent VTY users.
User interface assignment
The switch automatically assigns user interfaces to CLI login users, depending on their login methods.
Each user interface can be assigned to only one user at a time. If no user interface is available, a CLI
login attempt will be rejected.
For a CLI login, the switch always picks the lowest numbered user interface from the idle user interfaces
available for the type of login. For example, four VTY user interfaces (0 to 3) are configured, of which
VTY 0 and VTY 3 are idle. When a user Telnets to the switch, the switch assigns VTY 0 to the user and
uses the settings on VTY 0 to authenticate and manage the user.
User interface numbering
User interfaces can be numbered in two ways: absolute numbering and relative numbering.
Absolute numbering
An absolute number uniquely identifies a user interface among all user interfaces. The user interfaces are
numbered starting from 0 and incrementing by 1 and in the sequence of console, AUX, and VTY user
interfaces.
• Standalone mode
The console port and AUX port each use two numbers, and the VTY user interface uses numbers 20
through 35.
• IRF mode
The user interfaces of the master are numbered the first, and then the subordinate switch. The
console port and AUX port each use four numbers, and the VTY user interface uses numbers 24
through 39.