This document describes how to work with and implement QOS Policy Propagation for BGP, or in short QPPB.
QPPB is the concept of marking prefixes received from BGP with a certain QOS group assignment and this QOS-group can be used
in egress policies (or even ingress policies after marking) to perform certain actions.
While this seems so simple, and it is technically, the ability to achieve this functionality in hardware is quite complex.
In this article I hope to unravle some of these gotcha's and operation when it comes to QPPB.