Published on March 12, 2014
VLAN Virtual Local Area Networks Computer Networks Tutun Juhana Telecommunication Engineering School of Electrical Engineering & Informatics Institut Teknologi Bandung 10 Source: Hands-On Networking, From Theory to Practice, by MARIA LUISA MERANI, MAURIZIO CASONI, ALTER CERRONI, Cambridge Uni.Press, 2009
• 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
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
Static VLANs 6
Dynamic VLAN 7
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
VLAN on multiple switches 9 A switch-to-switch connection allows intra-VLAN communication 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) such a brute force approach would require each switch to know the assignment of the other switch ports for the shared VLAN
10 Complex VLAN databases and the consequent burdensome switch forwarding operations are not the correct answer
The tag Tagging to the rescue 11 • 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 inter- switch forwarding
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
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