Administrator Guide

The following is sample output of the show login statistics unsuccessful-attempts time-period days command.

DellEMC# show login statistics unsuccessful-attempts time-period 15

There were 0 unsuccessful login attempt(s) for user admin in last 15 day(s).

The following is sample output of the show login statistics unsuccessful-attempts user login-id command.

DellEMC# show login statistics unsuccessful-attempts user admin

There were 3 unsuccessful login attempt(s) for user admin in last 12 day(s).

The following is sample output of the show login statistics successful-attempts command.

DellEMC#show login statistics successful-attempts

There were 4 successful login attempt(s) for user admin in last 30 day(s).

Limit Concurrent Login Sessions

Dell EMC Networking OS enables you to limit the number of concurrent login sessions of users on VTY, auxiliary, and console lines. You

can also clear any of your existing sessions when you reach the maximum permitted number of concurrent sessions.

By default, you can use all 10 VTY lines, one console line, and one auxiliary line. You can limit the number of available sessions using the

configure the system to provide an option to the users to clear any of their existing sessions. To restrict the total amount of VTY lines

using ACL, see the Denying and Permitting Access to a Terminal Line section.

Restrictions for Limiting the Number of Concurrent

Sessions

These restrictions apply for limiting the number of concurrent sessions:

• Only the system and security administrators can limit the number of concurrent sessions and enable the clear-line option.

• Users can clear their existing sessions only if the system is configured with the login concurrent-session clear-line

enable command.

Configuring Concurrent Session Limit

To configure concurrent session limit, follow this procedure:

• Limit the number of concurrent sessions for each user.

CONFIGURATION mode

The following example limits the permitted number of concurrent login sessions to 4.

DellEMC(config)#login concurrent-session limit 4

Enabling the System to Clear Existing Sessions

To enable the system to clear existing login sessions, follow this procedure:

• Use the following command.

CONFIGURATION mode

NOTE:

If both concurrent sessions and the maximum number of VTY lines used are the same, the next or the

following attempt will be unsuccessful and the system displays access denied message. It is not possible to attempt

after clearing one of the existing sessions as user authentication has to happen first and before clearing the existing

maximum VTY sessions have reached and hence no clear-line option.

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