Rackmount switch poe switch switching ports 28 gigabit ethernet ports 24 x rj 45 4 x sfp switch type standalone management managed layer 2 network standards vlan quality of services qos full duplex link layer discovery protocol lldp spanning tree protocol stp link aggregation lag link aggregation control protocol lacp weighted round robin wrr igmp snooping dhcp snooping loop detection backplane bandwidth 56 gbs packet forwarding rate 417 max p