Catalyst 3750X 48 Port Data LAN Base 1,Original Brand New & 1 Yr Warranty 2. ... High Availability, Multicast Storm Control, Unicast Storm Control, Rapid Spanning Tree Protocol (RSTP) support, DHCP snooping, Dynamic Trunking Protocol ( ... (DAI), PoE+, Cisco StackWise Technology, Per-VLAN Spanning Tree Plus (PVST+), Uni-Directional Link Detection (UDLD), Shaped ... -L Catalyst 3750X 48 Port Data LAN Base