Rackmount switch poe switch switching ports 26 gigabit ethernet ports 26 x rj 45 2 x sfp switch type stackable management managed layer 3 network standards power over ethernet poe energy efficient ethernet weighted round robin wrr vlan access control list acl quality of services qos broadcast storm control multicast unicast storm control link aggregation control protocol lacp mac address auto aging spanning tree protocol stp link layer discovery prot