Abstract : VLAN is an emerging technology that logically, rather than physically, divides devices within a local area network (LAN) into segments to create virtual workgroups. This article discusses the implementation of port-based and tag-based VLAN segmentation in an embedded Linux system using a Layer 2 Ethernet switch as the hardware platform. This function effectively solves the problem of switches being unable to restrict broadcasts when interconnecting LANs. Keywords : Ethernet switch; driver; embedded; VLAN; RTL8305 0 Introduction VLAN (Virtual Local Area Network) was proposed to solve the broadcast problem and improve security in Ethernet. It divides users into smaller workgroups, restricting Layer 2 communication between users in different workgroups. Each workgroup is a virtual LAN. There are various forms of VLAN segmentation. To achieve the goal of restricting broadcasts, we utilize port-based and tag-based VLAN segmentation. [Full text download of VLAN segmentation and implementation in embedded Linux Ethernet switches]