Features:Flow control, ARP support, port mirroring, Spanning Tree Protocol (STP) support, Rapid Spanning Tree Protocol (RSTP) support, Virtual Route Redundancy Protocol (VRRP) support, Multiple Spanning Tree Protocol (MSTP) support, Access Control List (ACL) support, Quality of Service (QoS), front to back airflow, LACP support, LLDP support, Dynamic VLAN Support (GVRP), 4 fans, Priority-Based Flow Control (PFC), Internet Control Message Protocol (ICMP), DNS client