  Multi-Access Edge Computing (MEC) will allow implementing low-latency
services that have been unfeasible so far. The European Telecommunications
Standards Institute (ETSI) and the 3rd Generation Partnership Project (3GPP)
are working towards the standardization of MEC in 5G networks and the
corresponding solutions for routing user traffic to applications in local area
networks. Nevertheless, there are neither practical implementations for
dynamically relocating applications from the core to a MEC host nor from one
MEC host to another ensuring service continuity. In this paper we propose a
solution based on Software-Defined Networking (SDN) to create a new instance of
the IP anchor point to dynamically redirect User Equipment (UE) traffic to a
new physical location (e.g. an edge infrastructure). We also present a novel
approach that leverages SDN to replicate the previous context of the connection
in the new instance of the IP anchor point, thus guaranteeing Session and
Service Continuity (SSC), and compare it with alternative state replication
strategies. This approach can be used to implement edge services in 4G or 5G
networks.
