The SummitStack feature is not licensed separately. You can use the SummitStack feature with an Edge license.
Note
For successful operation, the effective license level of all master-capable nodes must be the same.At startup, the license level the stack uses is the effective license level of the elected master node.
If the stack is using the Advanced Edge license and you attempt to add a master-capable node that is using an Edge license, the node does not become operational and shows as Failed with a License Mismatch reason when using the show slot {slot {detail} | detail } command.
Master-capable nodes continuously monitor the effective license level of the master node
Nodes with higher licenses levels than other nodes can be restricted to operate at a lower or effective license level.