The root port is the port closest to the root bridge. A designated port is a non-blocking port. The root bridge will have all designated ports.
Here's a crude diagram to clarify:
A (root bridge)
The ports on A connecting to B and C are designated ports. The ports on B and C connecting to A are root ports. On the link between B and C, one side is blocking and the other side is fowarding (which side depends on the STP election process). The side which is forwarding is the designated port.
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...