DSE 6.x is compatible with C* 3.11. In any case, there are a lot of sharp edges with mixing OSS C* and DSE nodes so it's not recommended.
It is going to be addressed in a future release. Cheers!
- Migration between Apache 4.x and DSE 6+? Durity, Sean R
- Re: Migration between Apache 4.x and DSE 6+? Erick Ramirez
