OSPF Routing Tutorial¶
This tutorial demonstrates the operation of the OSPF routing protocol model in INET.
Contents:
- Step 1. Pinging after OSPF convergence
- Step 2. Change link cost
- Step 2a. Reroute after link breakage
- Step 3. OSPF full adjacency establishment and LSDB sync
- Step 4. Router LSA
- Step 4a. Advertising loopback interface
- Step 5. Effect of network type of an interface on routing table routes
- Step 5a. Mismatched Parameters between two OSPF neighbor
- Step 6. OSPF DR/BDR election in a multi-access network (Ethernet)
- Step 7. Influencing OSPF DR/BDR election
- Step 8. Setting all router ids to zero
- Step 9. High-priority OSPF router joins after OSPF DR/BDR election
- Step 10. Network Topology Changes
- Step 10a. Router R4 goes down
- Step 10b. Router R2 (DROTHER) goes down
- Step 10c. Router R5 (BDR) goes down
- Step 10d. Router R1 (DR) goes down
- Step 11. Configure an interface as NoOSPF
- Step 12. Configure an interface as Passive
- Step 13. Freshness of a LSA
- Step 14. Hierarchical OSPF topology and summary LSA
- Step 15. Set advertisement of a network to ‘false’
- Step 16. OSPF topology change in multi-area OSPF
- Step 17. Loop avoidance in multi-area OSPF topology
- Step 17a. Make R3 an ABR - advertise its loopback to backbone
- Step 17b. Make R3 an ABR - create a vitual link between R1 and R3
- Step 17c. Summary LSA
- Step 18. AS-External LSAs of ‘type 1 metric’ with different advertised destination
- Step 18a. AS-External LSAs of ‘type 1 metric’ with the same advertised destination
- Step 18b. AS-External LSAs of ‘type 2 metric’ with different advertised destination
- Step 18c. AS-External LSAs of ‘type 2 metric’ with the same advertised destination
- Step 18d. AS-External LSAs of mixed ‘type 1/type 2 metric’ with the same advertised destination
- Step 18e. Address Forwarding
- Step 19. Default-route distribution in OSPF
- Step 20. Stub area
- Step 21. Virtual link - connect two separate parts of a discontinuous backbone
- Step 22. Virtual link - connect a disconnected area to the backbone
- Step 23. OSPF Path Selection
- Step 24. OSPF Path Selection - Suboptimal routes
- Step 25. PCAP recording
- Conclusion