Rackmount switch poe switch switching ports 48 10 gigabit ethernet ports 4x sfp gigabit ethernet ports 48 x rj 45 switch type stackable management managed layer 3 network standards igmp snooping vlan link aggregation lag spanning tree protocol stp link aggregation control protocol lacp flow control full duplex address resolution protocol arp bootstrap protocol bootp link layer discovery protocol lldp power over ethernet poe backplane bandwidth