Poe switch rackmount switch switching ports 8 gigabit ethernet ports 2 x sfp 8 x rj 45 switch type standalone management managed layer 3 network standards power over ethernet poe igmp snooping mld snooping energy efficient ethernet vlan access control list acl broadcast storm control unicast storm control dhcp snooping link aggregation lag link aggregation control protocol lacp flow control full duplex spanning tree protocol stp link layer discovery