Cluster is different than stackable. Stackable typically means that the switches will share a very big backplane between switches that is usually through a proprietary cable.
Clusters, while allowing you to manage multiple switches as if they are a single switch, will only provide a backplane as fast as your uplink. For the 4948s that would 1Gbps or 10Gbps depending on your model.
We are pleased to announce availability of Beta software for 16.6.3. 16.6.3 will be the second rebuild on the 16.6 release train targeted towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are looking for early feedback from custome...