FGTENT-015 BGP AS PATH PREPEND 02 | FortiGate Firewall Configuration Step by Step
In this video, we dive into a real-world BGP design scenario where the actual IP exists as a /32 on a loopback interface, but we need to advertise a /24 prefix to upstream peers.
To achieve this, I demonstrate:
Why a blackhole (null) route is required for advertising a summary prefix
How to advertise the same /24 network from both DC and DR
Using AS-Path Prepending to control inbound traffic preference
How ISPs choose the best path when the same prefix is advertised from multiple locations
Practical BGP design considerations for redundancy and failover
This lab is extremely useful if you’re working with:
Multi-DC / DR architectures
ISP edge BGP designs
Public IP advertisements with loopback interfaces
Traffic engineering using AS-Path manipulation
🧪 Lab-based | CLI-focused | Real-world scenario
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#BGP #aspathprepend #loopback