SG220 or newer CBS220 have a few features less than SG250 or newerCBS250. and SG/CBS350 got extra more features and this is obviously related to the pricing as well. so i suggest you check the feature matrix:
actually it looks like that the active mode is trunk:
switchport mode trunk
you can double check this by displaying output show interfaces switchport <gi2> and please check with is next to the Operational Mode:....
this would give...