Rackmount switch poe switch switching ports 8 gigabit ethernet ports 8 x rj 45 2 x sfp switch type standalone management managed layer 2 network standards power over ethernet poe flow control full duplex auto negotiation vlan igmp snooping loop detection link layer discovery protocol lldp port mirroring spanning tree protocol stp mld snooping quality of services qos weighted round robin wrr broadcast storm control unicast storm control energy effici