VLANs
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This document discusses virtual local area networks (VLANs) and their benefits and types. It covers the following key points: VLANs logically group stations regardless of their physical location, allowing powerful and flexible switched environments. There are two main types: static VLANs where the network administrator assigns ports to a VLAN, and dynamic VLANs where address-based criteria determine VLAN membership. VLAN configuration on a single switch involves creating VLANs with identifiers and assigning ports. Multiple switches require inter-switch communication and sharing of VLAN databases. The IEEE 802.1Q standard uses tagging to solve this by having each frame carry a VLAN identifier for inter-switch forwarding. A layer-3 router is needed for inter-VLAN communication.
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Virtual Local Area Networks (VLANs) logically separate devices into broadcast domains to improve network security and performance. There are two main types of VLANs: static VLANs where the network administrator assigns ports to VLANs, and dynamic VLANs where devices are assigned to VLANs based on their MAC or IP addresses. VLANs allow multiple logical networks to exist within a single physical switch infrastructure by using VLAN tags to identify which VLAN a frame belongs to, enabling inter-switch communication while maintaining isolation between VLANs. A layer 3 device such as a router is required to route traffic between different VLANs.
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VLANs logically separate broadcast domains on a physical network by grouping ports on a switch. This reduces broadcast traffic and allows more flexible workgroup configurations than are possible through physical port locations alone. There are several types of VLANs including those defined by port, protocol, IP subnet, and MAC address. VLAN tagging allows switches to identify and enforce VLAN membership by adding a tag field to frames. This provides benefits like easier switching but introduces challenges around frame size and compatibility.
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http://www.cyberintelligents.in
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In computer networking, a single layer-2 network may be partitioned to create multiple distinct
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more routers; such a domain is referred to as a virtual local area network, virtual LAN or VLAN.
A virtual local area network (VLAN) is a logical group of workstations, servers and network devices that
appear to be on the same LAN despite their geographical distribution. A VLAN allows a network of
computers and users to communicate in a simulated environment as if they exist in a single LAN and are
sharing a single broadcast and multicast domain.
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This document discusses virtual local area networks (VLANs). It defines VLANs as logically segmenting switched networks based on functions, project teams, or applications, regardless of physical location or network connections. VLANs divide stations into logical groups through software instead of physical segments, allowing easy movement of stations between groups without changing physical configurations. Common VLAN types include port-based, MAC address-based, and protocol-based. Benefits of VLANs include logical organization of networks, easy moves and additions of workstations, flexible configuration changes, traffic control, and improved security.
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This chapter discusses how switches and routers forward network traffic. It covers Layer 2 forwarding using MAC addresses on switches and Layer 3 forwarding using IP addresses on routers. The chapter examines common forwarding mechanisms like MAC address tables, VLANs, trunking, and allowed VLANs. It describes how switches build MAC tables to reduce flooding and how routers use IP forwarding tables to send packets to their destination.
Network Virtualization
This document discusses various concepts related to network virtualization. It begins by explaining virtual LANs (VLANs) and how they create broadcast domains on a physical network using VLAN tags. It then discusses how OpenFlow can implement more flexible VLAN support and how virtual private networks (VPNs) can provide private networks over public infrastructure using IPsec or MPLS. Network virtualization is defined as the ability to run multiple logical networks over a shared physical network. OpenDaylight's Virtual Tenant Network plugin provides multitenant virtual networks on a SDN using VLAN technology. The document concludes with a brief discussion of software-defined infrastructure.
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VLAN Virtual Area Network ,Switch,Ethernet ,VIkram Snehi
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VLANs
- 1. 5 Tutun Juhana Telecommunication Engineering School of Electrical Engineering & Informatics Institut Teknologi Bandung VLAN Virtual Local Area Networks Computer Networks Source: Hands-On Networking, From Theory to Practice, by MARIA LUISA MERANI, MAURIZIO CASONI, ALTER CERRONI, Cambridge Uni.Press, 2009
- 2. • Powerful and flexible solutions to build switched environments • The evident advantage is to allow the logical grouping of stations into disjoint broadcast domains, regardless of their physical location 2
- 3. 3
- 4. 4
- 5. VLAN classification • Static VLANs – The network administrator assigns switch ports to a specific VLAN – That’s why static VLANs sometimes referred to as port-based VLANs • Dynamic VLANs – The criterion leading the VLAN membership is the station address, either layer-2 (MAC address), or layer-3 (network address) 5
- 8. VLAN on a single switch • Switch configuration encompasses two steps 1. The creation of two VLANs with their respective VLAN identifier, VID 2. The assignment of the desired switch ports to each VLAN 8
- 9. VLAN on multiple switches A switch-to-switch connection allows intra-VLAN communication such a brute force approach would require each switch to know the assignment of the other switch ports for the shared VLAN The two points worthy of mention are: 1. Frames originating within both VLANs need to traverse the connection between the two switches; 2. The two switches will have to share some type of VLAN database (no matter whether a static or dynamic VLAN configuration is adopted) 9
- 10. Complex VLAN databases and the consequent burdensome switch forwarding operations are not the correct answer 10
- 11. The tag Tagging to the rescue • The tag solution is partly provided by the IEEE 802.1Q standard • Each frame carry a tag the tag contain a VID the switches exclusively rely on VIDs for interswitch forwarding 11
- 12. Inter-VLAN communications The presence of a layer-3 device (a router) is mandatory to allow members of different VLANs to interact 12
- 13. easy to implement, it lacks scalability 13
- 14. 14
- 15. 15