User lines
The device uses user lines (also called user interfaces) to manage CLI sessions and monitor user behavior. For a user line, you can configure access control settings, including the login authentication method and user roles.
The device supports the user lines listed in Table 11. Different user lines require different login methods.
Table 11: CLI login method and user line matrix
User line | Login method |
|---|---|
AUX line | Console port. |
Virtual type terminal (VTY) line | Telnet or SSH. |
User line numbering
Every user line has an absolute number and a relative number.
An absolute number uniquely identifies a user line among all user lines. The user lines are numbered starting from 0 and incrementing by 1, in the sequence of console, TTY, AUX, and VTY lines. You can use the display line command without any parameters to view supported user lines and their absolute numbers.
A relative number uniquely identifies a user line among all user lines of the same type. The number format is user line type + number. TTY lines are numbered starting from 1 and incrementing by 1. All other types of user lines are numbered starting from 0 and incrementing by 1. For example, the first VTY line is VTY 0.
User line assignment
The device assigns user lines to CLI login users depending on their login methods, as shown in Table 11. When a user logs in, the device checks the idle user lines for the login method, and assigns the lowest numbered user line to the user. For example, four VTY lines (0 to 3) are configured, of which VTY 0 and VTY 3 are idle. When a user Telnets to the device, the device assigns VTY 0 to the user.
Each user line can be assigned only to one user at a time. If no user line is available, a CLI login attempt will be rejected.