FGTENT-016 BGP AS PATH PREPEND 03 asymmetric route | FortiGate Firewall Configuration Step by Step
In this video (Part 16 of the JDLAB BGP Series), I demonstrate a real-world routing issue caused by AS-path prepending.
After manipulating inbound traffic using AS-path prepending between DC and DR, the network becomes asymmetric — traffic enters from one path but exits from another.
⚠️ This creates:
Session drops
Firewall issues
Unstable routing behavior
Difficult-to-trace connectivity problems
🔍 What I Covered:
How AS-path prepending affects path selection
Why asymmetric routing happens in multi-site BGP design
Packet flow analysis
Troubleshooting methodology
Step-by-step fix to restore symmetric routing
This lab simulates a real enterprise DC/DR topology using BGP route manipulation techniques.
If you're learning:
BGP Traffic Engineering
AS-Path Prepending
Route Manipulation
DC/DR Design
Real-world troubleshooting
This video will help you understand the practical impact of policy-based routing decisions.
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#BGP #aspathprepend #loopback