Ca Ex S3 C6 Inter Vlan Routing

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  • 1. CCNA – Semester1 Chapter 6 - Inter – VLAN Routing CCNA Exploration version 4.0
  • 2. Objectives • Explain how network traffic is routed between VLANs in a converged network. • Configure inter-VLAN routing on a router to enable communications between end-user devices on separate VLANs • Troubleshoot common inter-VLAN connectivity issues. 2
  • 3. Introduction 3
  • 4. Introduction Inter-VLAN Routing permits computers on separate VLANs can communicate with each other 4
  • 5. Traditional Inter-VLAN Routing • In a traditional network that uses multiple VLANs to segment the network traffic into logical broadcast domains, routing is performed by connecting different physical router interfaces to different physical switch ports. 5
  • 6. "Router-on-a-stick" Inter-VLAN Routing • "Router-on-a-stick" is a type of router configuration in which a single physical interface routes traffic between multiple VLANs on a network. 6
  • 7. Switched-based Inter-VLAN Routing • Some switches can perform Layer 3 functions, replacing the need for dedicated routers to perform basic routing on a network. Multilayer switches are capable of performing inter- VLAN routing. 7
  • 8. Interface and Subinterface 8
  • 9. Interface • Traditional routing requires routers to have multiple physical interfaces to facilitate inter-VLAN routing. • Each interface is also configured with an IP address for the subnet associated with the particular VLAN that it is connected to. • In this configuration, network devices can use the router as a gateway to access the devices connected to the other VLANs. 9
  • 10. Interface Configuration 10
  • 11. Subinterface • To overcome the hardware limitations of inter-VLAN routing based on router physical interfaces, virtual subinterfaces and trunk links are used. • Each subinterface is configured with its own IP address, subnet mask, and unique VLAN assignment, allowing a single physical interface to simultaneously be part of multiple logical networks. • Functionally, the router-on-a-stick model for inter-VLAN routing is the same as using the traditional routing model, but instead of using the physical interfaces to perform the routing, subinterfaces of a single interface are used. 11
  • 12. Subinterface (cont) 12
  • 13. Subinterface Configuration 13
  • 14. Comparison Features Physical Interface Subinterface One physical interface One physical interface for Port Limits per VLAN many VLANs Performance No bandwidth contention Bandwidth contention Access Ports and Connected to access Connected to trunk mode Trunk Ports mode switch port switch port Cost More expensive Less expensive More complex Less complex connection Complexity connection configuration configuration 14
  • 15. Configure Inter-VLAN Routing 15
  • 16. Configure Traditional Inter-VLAN Routing Switch Configuration 16
  • 17. Configure Traditional Inter-VLAN Routing Router Configuration 17
  • 18. Configure Traditional Inter-VLAN Routing 18
  • 19. Configure Router-on-a-Stick Inter-VLAN Routing Switch Configuration 19
  • 20. Configure Router-on-a-Stick Inter-VLAN Routing Router Configuration 20
  • 21. Configure Router-on-a-Stick Inter-VLAN Routing 21
  • 22. Some ISSUES with Inter-VLAN Routing 22
  • 23. Switch Configuration Issues • Switch ports are not configured on the correct VLAN • No redundant connection or path between the devices 23
  • 24. Router Configuration Issues • Connect the physical router interface to the wrong switch port, placing it on the incorrect VLAN and preventing it from reaching the other VLANs. 24
  • 25. Router Configuration Issues Router R1 has been configured to use the wrong VLAN on subinterface F0/0.10, preventing devices configured on VLAN10 from communicating with subinterface F0/0.10 25
  • 26. IP Addressing Issues Router R1 has been configured with an incorrect IP address on interface F0/0. This prevents PC1 from being able to communicate with router R1 on VLAN10. 26
  • 27. IP Addressing Issues (cont) PC1 has been configured with an incorrect IP address for the subnet associated with VLAN10. This prevents PC1 from being able to communicate with router R1 on VLAN10. 27
  • 28. IP Addressing Issues (cont) PC1 has been configured with the incorrect subnet mask 28
  • 29. Summary 29