Trial Licenses
 
 
   You can obtain a trial license, which allows you to use the license for 30
      days, and you can downgrade trial licenses to a lower software license level during the trial
      period. You can extend the time of the trial by 30 days two times (for a total of 90 days).
      Most feature packs are enabled. After you enable the trial license, the switch behaves as if
      all software license levels and feature packs are enabled. The trial license key contains all
      the necessary information on the license level and the number of days. Trial licenses can be
      applied only once for each software version; if you upgrade to a different software version,
      you can reapply your trial license. It is not recommended to use a trial license in
        production.

Note   
The Network Timing feature pack is not included in
        the trial license.
 
 
    To enable a trial license, execute debug epm enable trial-license.
    To clear a trial license, execute debug epm clear trial-license. A reboot is
      required before the clear license takes effect.
    
Note   
Enabling a newly obtained license requires clearing the trial license, and then rebooting
      the switch.