Classification assigned to this port. regular - this port is connected to regular stations. Topology changes that may occur on it will not generate the sending of topology change (notification) BPDUs, will not generate a fast aging on the local forwarding database, and will not be signaled by console if the port administrative status is disabled. valuable - this port is used as a backbone link or is connected to a valuable server. Topology changes that may occur on it will generate a fast aging on the local forwarding database, and if STA is enabled on the stack, the sending of topology change (notification) BPDUs. It will also be signaled and propagated by console even if the port administrative status is disabled or if STA is disabled on this port.