Some weeks ago was asked some questions and I totally missed that BGP has a feature to advertise more paths than just the best path, that is the default behaviour. So I wanted to learn more about it. The RFC is here. It is good to understand the negotiation of the feature. I have search for other links that give you a bit more info about the implementation/design details. Because, reading the RFC, I didnt notice that this feature is for iBGP, like mentioned here.
Another feature I need to lab it up.