🔥 OSPF & BGP Configuration and Connectivity | Step-by-Step Lab Guide #ospf #ccna #ccnp #routing

In this video, we configure and verify **OSPF (Open Shortest Path First)** and **BGP (Border Gateway Protocol)** working together in a multi-network topology. This lab demonstrates how an IGP (OSPF) and an EGP (BGP) interact to provide full internal and external connectivity.

If you're preparing for **CCNA, CCNP, or real-world enterprise/ISP networking**, this tutorial will help you clearly understand route exchange, redistribution concepts, and neighbor establishment.

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## 📌 What You’ll Learn

✅ Configuring OSPF for internal routing
✅ Establishing BGP neighbor relationships
✅ Advertising networks in BGP
✅ Understanding AS numbers
✅ Verifying routing tables
✅ Testing end-to-end connectivity
✅ Basic route redistribution concepts

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## 🖥️ Lab Scenario Overview

* Multiple routers connected in different networks
* OSPF configured as the Internal Gateway Protocol (IGP)
* BGP configured between different Autonomous Systems
* Route sharing between OSPF and BGP
* Full connectivity testing using ping & traceroute

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## ⚙️ Sample OSPF Configuration

```
Router(config)# router ospf 1
Router(config-router)# network 192.168.1.0 0.0.0.255 area 0
Router(config-router)# network 10.0.0.0 0.0.0.3 area 0
```

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## ⚙️ Sample BGP Configuration

```
Router(config)# router bgp 65001
Router(config-router)# neighbor 10.0.0.2 remote-as 65002
Router(config-router)# network 192.168.1.0 mask 255.255.255.0
```

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## 🔍 Verification Commands

* `show ip ospf neighbor`
* `show ip bgp summary`
* `show ip route`
* `ping` & `traceroute`

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## 🎯 Why Use OSPF + BGP Together?

✔ OSPF for fast internal convergence
✔ BGP for scalable inter-AS routing
✔ Common design in enterprise edge and ISP environments
✔ Better control over route advertisement and policy

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