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🛠 Project 03 — Static & Dynamic Routing (OSPF)

Network Systems

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Project 03: Static & Dynamic Routing (OSPF)

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Type: Hands-on Packet Tracer lab Modules: 12 (WAN), 03/08 (Addressing/Subnets) Difficulty: ⭐⭐⭐⭐

🎯 Objective

Build a three-router WAN and make every LAN reachable — first with static routes, then with OSPF dynamic routing — and understand why one route is chosen over another (administrative distance).

📌 Topology

   [PC-A]         [PC-B]          [PC-C]
     |              |               |
  (LAN A)        (LAN B)         (LAN C)
     |              |               |
    R1 ==== WAN1 ==== R2 ==== WAN2 ==== R3
Link Subnet
LAN A (R1) 10.0.1.0/24
LAN B (R2) 10.0.2.0/24
LAN C (R3) 10.0.3.0/24
WAN1 (R1–R2) 10.0.12.0/30
WAN2 (R2–R3) 10.0.23.0/30

🧭 Part A — Static Routing

  1. Configure all interface IPs and PC gateways.
  2. On each router, add static routes to the networks it doesn't directly connect to.
R1(config)# ip route 10.0.2.0 255.255.255.0 10.0.12.2
R1(config)# ip route 10.0.3.0 255.255.255.0 10.0.12.2
R1(config)# ip route 10.0.23.0 255.255.255.252 10.0.12.2
  1. Verify PC-A can ping PC-C end to end.

📌 Part B — Convert to OSPF

  1. Remove the static routes.
  2. Enable OSPF and advertise the connected networks.
R2(config)# router ospf 1
R2(config-router)# network 10.0.2.0 0.0.0.255 area 0
R2(config-router)# network 10.0.12.0 0.0.0.3 area 0
R2(config-router)# network 10.0.23.0 0.0.0.3 area 0
  1. Confirm routes are learned dynamically and full connectivity is restored.

📌 Part C — Administrative Distance

  1. Re-add one static route to a network also learned via OSPF.
  2. Check show ip route — which is installed? Explain using AD (static = 1, OSPF = 110).

✅ Verification

  • show ip route shows remote networks (marked S for static, O for OSPF).
  • End-to-end ping PC-A ↔ PC-C succeeds under both methods.
  • show ip ospf neighbor lists adjacencies in Part B.
  • You can explain which route wins in Part C and why.

📦 Deliverables

  • Packet Tracer file (local).
  • A comparison table: static vs. dynamic (effort, scalability, convergence).
  • Answer: what happens to OSPF if the R1–R2 link fails? (Test it.)

🚀 Stretch Goals

  • Add a default route on R1 toward a simulated ISP and redistribute it.
  • Configure a floating static route as a backup path.

See also notes: [[12-03-routing]], [[12-01-wan-fundamentals]]