R2511-HP MSR Router Series Fundamentals Configuration Guide(V5)

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User interface assignment
The device 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. The maximum number of user interfaces varies by device.
For a CLI login, the device 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 device, the device assigns VTY 0 to the user and
uses the settings on VTY 0 to authenticate and manage the user.
User interface identification
A user interface can be identified by an absolute number, or the interface type and a relative number.
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, TTY, AUX, and VTY
user interfaces. You can use the display user-interface command without any parameters to view
supported user interfaces and their absolute numbers.
A relative number uniquely identifies a user interface among all user interfaces that are the same type.
The number format is user interface type + number. Except for TTY user interfaces, which are numbered
starting from 1 and incrementing by 1, all the other types of user interfaces are numbered starting from
0 and incrementing by 1. For example, the first console user interface is console 0.