Chapter 4. The Wide-Area Network: Bringing Traffic from Access to the Data Center

Wide-area networks (WANs) evolved at a rather conservative pace over the years. The recent adoption of overlays in areas of the network adjacent to the WAN has fueled an appetite for a simpler and more efficient WAN design.

This chapter discusses the challenges encountered in WANs and how networking technology evolved to meet these challenges and enable alternative designs to the WAN. LISP plays a pivotal role in the technological evolution of the WAN and is the focus of this discussion.

Modern WAN Services

For many years the wide-area network was designed as a collection of hub facilities that aggregate traffic from a relatively large distribution of locations. ...

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