Iuwne10 S01 L09


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Iuwne10 S01 L09

  1. 1. Wireless Fundamentals Reviewing the Wireless Frame Journey: End-to-End
  2. 2. Discovering the Network
  3. 3. Getting Connected
  4. 4. Clients in Cells
  5. 5. Sending in the Cell
  6. 6. Creating the 802.11 Frame
  7. 7. Acknowledging the Frame
  8. 8. AP Forwarding to Network
  9. 9. AP Forwarding to Controller
  10. 10. In the Controller, Header Is Rewritten
  11. 11. Wired Segment
  12. 12. In the Controller, on the Way Back
  13. 13. The AP Forwards the Answer
  14. 14. Using the Optimal Speed
  15. 15. The Right Client Processes the Frame
  16. 16. All Frames Are Sent to the Same AP Radio
  17. 17. Controller Needs to Keep SSIDs Separated
  18. 18. VLANs <ul><li>VLAN = Broadcast Domain = Logical Network (Subnet) </li></ul>
  19. 19. VLAN Operation
  20. 20. 802.1Q Trunking
  21. 21. Understanding Native VLANs
  22. 22. Mapping SSIDs to VLANs Each SSID is mapped to a VLAN: 1 SSID => 1 subnet and 1 VLAN tag
  23. 23. Configuring VLANs and Trunks <ul><li>Create or modify a VLAN on the switch. </li></ul><ul><li>Assign switch ports to a VLAN and verify. </li></ul><ul><li>Save the VLAN configuration. </li></ul><ul><li>Configure and verify 802.1Q trunks, and save. </li></ul>
  24. 24. <ul><ul><li>The maximum number of VLANs is switch-dependent. </li></ul></ul><ul><ul><li>VLAN 1 is the factory default Ethernet VLAN. </li></ul></ul><ul><ul><li>Cisco Discovery Protocol is sent on native untagged VLAN. </li></ul></ul><ul><ul><li>The Cisco Catalyst switch IP address is in the management VLAN (VLAN 1 by default). </li></ul></ul>VLAN Creation Guidelines
  25. 25. Adding a VLAN
  26. 26. Assigning Switch Ports to a VLAN
  27. 27. Verifying VLAN Membership
  28. 28. Verifying VLAN Membership (Cont.)
  29. 29. 802.1Q Trunking <ul><li>Make sure that the native VLAN for an 802.1Q trunk is the same on both ends of the trunk link. </li></ul><ul><li>Note that native VLAN frames are untagged. </li></ul>
  30. 30. Configuring 802.1Q Trunking
  31. 31. Verifying a Trunk
  32. 32. Summary <ul><ul><li>When wireless frames transit to the wired side of the network, the body is unchanged but the header is transformed to a 802.3 header. </li></ul></ul><ul><ul><li>VLANs provide on Ethernet segments the segmentation that SSIDs bring to the wireless side. </li></ul></ul><ul><ul><li>VLANs create tags on frames, and trunks carry these framed tags from switch to switch. </li></ul></ul><ul><ul><li>VLAN membership can be static or dynamic. </li></ul></ul><ul><ul><li>Controllers tag frames, and the other end, which is a switch, has to be in trunk mode. </li></ul></ul><ul><ul><li>A switch has a “native VLAN,” which is usually not tagged on a trunk. </li></ul></ul><ul><ul><li>Configuring static VLANs consists of creating them and assigning a port to them. </li></ul></ul>