I have earlier made a written post on this topic. You can find it here. Based on the feedback I have been getting from the post, I decided to make a video on it which I want to share with it us. Bgp is the only protocol that is used to advertise the routing table of of the internet and in most cases, network engineers have found themselves trying to implement bgp in a dual-ISP setup. This demonstration shows how to advertise your prefixes out two ISP links while making sure that most of your in-coming traffics are passed through ISP1 but should fail over to ISP2 in the event that ISP1 goes down.
See video below.