Border Gateway Protocol (BGP) policy manipulation is what Layer 3 traffic engineering is all about when it comes to BGP! Knowing how to “control” the egress flow of traffic using WEIGHT and LOCAL_PREFERENCE or trying to “influence” the ingress flow of traffic with AS_PATH prepending and the Multi-Exit Discriminator (MED) can make the difference between a good design and a “resume-generating design”. Check out this tutorial that walks through BGP policy manipulation and even shows you how to avoid becoming a transit Autonomous System (AS)! Â Enjoy!