Module 6
BGP Between Networks
Routing between organisations, where the shortest path is frequently the one you least want. Six labs, four of which are established sessions behaving in ways an interior protocol never would.
In this module
- Distinguish external from internal BGP and say why the rules differ
- Advertise a prefix and confirm the far side installed it
- Diagnose an established session that carries no prefixes
- Explain why an iBGP route can sit in the BGP table and never be installed
Activities
BGP, and why it is not like the others
Autonomous systems, the AS path, and policy over distance.
A two-router eBGP session
Bringing the session up, and what established does not mean.
Advertise a customer LAN
Getting one prefix from one side to the other.
Session up, no routes
The characteristic BGP fault, staged.
Learned but never installed
A prefix in the BGP table whose next hop nobody can reach.
Traffic leaves by the backup circuit
Everything reachable, over the wrong exit.
Transit site onboarding
A site reached through two hops of eBGP.
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Curriculum topics
- Routing
- Dynamic Routing
- Troubleshooting
Each topic page lists every lesson, quiz and hands-on lab that covers it, plus how it maps onto the CCNA and Network+ blueprints.