Overlay Network and Tunneling

Abstract

Multiprotocol Label Switching (MPLS) has long been the standard for wide area network (WAN), one of the most benefits of MPLS is that it delivers packets providing high Quality of service and proficiently manages and avoids packet loss. However, MPLS is complex, time-consuming to manage, and so expensive to upgrade and scale. SD-WAN comes to overcome many of those problems while creating security and predictability issues, it is considered as an overlay network which is a virtual network that is built on top of an underlying Network infrastructure such as MPLS.