BGP AS-Path Prepending Calculator

Model how artificial AS-Path prepending shifts inbound traffic steering across primary and backup eBGP transit providers.

1. Local & Peer Configuration

Your Autonomous System (Local AS)

Target Prefix

ISP A (Primary Transit)

Peer AS

Prepends Applied

ISP B (Backup Transit)

Peer AS

Prepends Applied

Path via ISP A 1 hop

65000

Path via ISP B 4 hops

65000 65000 65000 65000

Primary Inbound Path: ISP A (Shortest AS-Path Length)

Cisco IOS Route-Map Generator

! Generating route-map...