Routing vlans

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Routing vlans

  1. 1. Virtual local area networks VLAN
  2. 2. Basic switched networking
  3. 3. VLAN network
  4. 4. Why VLANs <ul><li>Security </li><ul><li>Ex. everybody may connect to the network, but has only acces to internet. </li></ul><li>Change network topology without physical changes
  5. 5. Possibility of dynamic changes between VLANs
  6. 6. Switching (layer 2) instead of routing (layer 3) - better performance </li></ul>
  7. 7. How it works <ul><li>Different network segments or ”broadcast domains”
  8. 8. Two basic ways </li><ul><li>Ethernet packages are tagged (IEEE 802.1Q)
  9. 9. VLANs based on the physical port of the switch. </li></ul><li>VLANs chosen dynamically, by MAC address or by switch port. </li></ul>
  10. 10. Untagged package Not shown in wireshark
  11. 11. Tagged package
  12. 12. Tagging issue <ul><li>Tagged frames are 4 bytes longer
  13. 13. Frames may become too long, and be dropped.
  14. 14. Frames may be dropped by older switches, due to non-comformity. </li></ul>
  15. 15. References <ul><li>http://www.javvin.com/protocolVLAN.html
  16. 16. http://www.cisco.com/en/US/docs/internetworking/technology/handbook/LAN-Switching.html#wp1021970
  17. 17. http://www.3com.com/other/pdfs/solutions/en_US/20037401.pdf </li></ul>

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