Implementation Issues

An AS can deploy the TIE mechanism without changing the intradomain or interdomain routing protocols, and without the cooperation of other domains. In this section, we first describe how to ensure that each router can apply TIE independently of other routers in the AS. Next we discuss how to configure the $\alpha$ and $\beta$ parameters and how a router applies the TIE mechanism to select a BGP route for each destination prefix. Then, we discuss how moving the responsibility for BGP path selection from the routers to separate servers [20,21] would make it possible to implement our TIE scheme without any modification to the decision logic running on the routers.