I would like to know how everyone does their MPLS design. Ideally, you put all sites on one single MPLS service provider, e.g. ATT, with single access link. Data centers will have two access links for redundancy.
However, what if I want to have two MPLS service providers, put half of the sites on one MPLS cloud and another half on the second MPLS cloud? How would you do the routing between them? ATT stated that they would not exchange routes to another SP. I would like to know if anyone has two MPLS SP and how they do it.