You can purchase license level upgrades for Summit family switches. All
        master-capable switches in a stack must run the same license level. If the license you want
        to run is not available for a specific Summit switch, you cannot use that switch and that
        license level as a master-capable switch. For example, if you want to upgrade to the core
        license, your master-capable nodes must be Summit family switches that support the core
          license.
        

Note   
For information on which switches support which
          licenses, 
see the Feature License Requirements document. This appendix also lists which switches support the SummitStack feature.