Software Required
The Extreme Hardware/Software Compatibility and Recommendation Matrices lists the minimum ExtremeXOS software version required to support each Summit and ExtremeSwitching switch, model.
![Note](../../images/Note_Note.png)
Note
The features available on each switch are determined by the installed feature license and optional feature packs. For more information, see the Feature License Requirements document.A SummitStack is a combination of up to eight Summit family switches that are connected together.