... support, MLD snooping, Dynamic ARP Inspection (DAI), PoE+, Cisco StackWise Technology, Per-VLAN Spanning Tree Plus (PVST+), Uni-Directional ... Round Robin (SRR), Link Aggregation Control Protocol (LACP), Remote Switch Port Analyzer (RSPAN)Compliant StandardsIEEE 802.3, IEEE 802.3u ... establish good business relation and cooperation! Best Sell Cisco WS-C3750X-48T-L Catalyst 3750X 48 Port Data LAN Base