Rackmount switch poe switch switching ports 24 gigabit ethernet ports 24 x rj 45 4 x sfp management managed layer 3 network standards quality of services qos vlan sflow access control list acl power over ethernet poe mld snooping energy efficient ethernet link layer discovery protocol lldp spanning tree protocol stp link aggregation lag link aggregation control protocol lacp flow control bootstrap protocol bootp igmp snooping backplane bandwidth