Rackmount switch poe switch switching ports 16 gigabit ethernet ports 16 x rj 45 switch type stackable management managed network standards power over ethernet poe access control list acl quality of services qos vlan spanning tree protocol stp weighted round robin wrr dhcp snooping address resolution protocol arp auto negotiation full duplex link aggregation control protocol lacp igmp snooping broadcast storm control unicast storm control energy effi