Deploying Lightweight Anycast Services Based-on Explicit Multicast Routing for Evolved Internet

As a one-to-one-of-many communication method, anycast provides a dependable service framework for clients to select one of the nearest servers in an anycast group in evolved Internet. Deploying the Internet-scale application-layer anycast is proven to be infeasible unless the scalability issues are satisfied. To handle these challenges, we focus on application-layer anycast. Proposed framework is a comprehensive solution which allows an anycast service has its unique domain-name (a.k.a FQDN), which is associated to multiple replicated servers' unicast addresses in the worldwide. With DNS query/reply service, and through Explicit Multicast (Xcast)-based replica probing, ranking, and selection procedures, clients finally reach the nearby server. Compared to previous works, proposed solution has lowered the address resolution latency, replica probing latency, connection establishment latency, and signaling cost, while simplifying the anycast deployment by having it use a large number of medium-scale anycast groups. Besides, the deployment complexity of both anycast clients and servers, are expected reduction.