... series supports numerous intelligent network management functions, including such as QoS, VLAN, Port Trunking, velocity configuration and alarm enabling functions.Features ... ,IEEE802.1p,IEEE802.1D,IEEE802.1WProtocol:SW-Ring,STP/RSTP,QoS,VLAN,PVLAN, IGMP v1/v2/v3,SNMP v1/v2/v3 ...