## 📌 Overview
This project simulates a real-world enterprise WAN where multiple geographically distributed sites connect to an ISP using **Border Gateway Protocol (BGP)**.
Each site operates as its own autonomous system and communicates through the ISP backbone. The lab demonstrates:
- Inter-domain routing using BGP
- Site-to-site connectivity over WAN links
- DHCP services per branch router
- Realistic enterprise IP addressing design
- 1 ISP Core Router (2911)
- 4 Branch Routers (each in separate AS)
- Each branch contains:
- WAN link to ISP
- LAN network with DHCP enabled
- End devices connected via switch
| Site | ASN |
|---|---|
| Port Moresby | AS65100 |
| Lae | AS65200 |
| Hagen | AS65300 |
| Goroka | AS65400 |
| ISP Core | AS65000 |
| Link | Network |
|---|---|
| ISP – Port Moresby | 10.0.0.0/30 |
| ISP – Lae | 10.0.0.4/30 |
| ISP – Hagen | 10.0.0.8/30 |
| ISP – Goroka | 10.0.0.12/30 |
| Site | Network |
|---|---|
| Port Moresby | 192.168.10.0/24 |
| Lae | 192.168.20.0/24 |
| Hagen | 192.168.30.0/24 |
| Goroka | 192.168.40.0/24 |
- 🧠 BGP (eBGP between ISP and branch routers)
- 🌐 IPv4 Routing
- 📡 DHCP (on each branch router)
- 🔌 Cisco Packet Tracer simulation
- 🖧 WAN / LAN segmentation
The following tests were successfully completed:
- BGP neighbor adjacency established across all sites
- Full end-to-end connectivity between all LAN networks
- DHCP assignment verified on all branch networks
- Routing table validation confirms learned BGP routes
- Establishes BGP neighbors with all branch routers
- Advertises WAN networks to ensure reachability
Each branch router:
- Runs eBGP with ISP
- Advertises its LAN network into BGP
- Provides DHCP services to local clients
Each site provides automatic IP assignment:
- Default gateway = router LAN interface
- DNS = 8.8.8.8
- Excluded addresses for network stability
- Maintains eBGP sessions with all branch AS routers
- Learns and propagates all branch LAN routes
-
Advertise LAN networks into BGP
-
Establish neighbor relationship with ISP
-
eBGP used for inter-domain routing between ISP and enterprise sites (real ISP architecture simulation)
-show ip bgp summary -show ip route -ping
Jamill Naipao
Port Moresby, Papua New Guinea
Project: Enterprise WAN Simulation | Cisco BGP Multi-Site Routing Lab
Tools: Cisco Packet Tracer
Focus: BGP, WAN Architecture, IP Design, DHCP Services