You can purchase license level upgrades for ExtremeSwitching 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 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 switches that support the core
            license.
        

Note   
For information about which
          switches support which licenses, see the 
    ExtremeXOS v33.1.1 Licensing Guide
    document. That document also
          lists which switches support the SummitStack feature.
 
       
      To upgrade the licenses for the switches in a stack, follow these steps.