Category: Asymmetric Routing

The Friend of my Friend is my Enemy

Imagine you’re a provider routing a PI space prefix for one of your customers. Now imagine that one of your IX peers started to advertise a more specific subnet of that customer network to you. How would and how should you forward traffic destined… Continue Reading “The Friend of my Friend is my Enemy”

Asymmetric routing caused by unfiltered redistribution

This quirk demonstrates how the different administrative distances of BGP, combined with the Best Path Selection algorithm can cause asymmetric routing if redistribution isn’t done carefully. As a reminder, each blog will follow 3 sections: The quirk, the search and the work. The quirk… Continue Reading “Asymmetric routing caused by unfiltered redistribution”