The network industry has largely been focused on network transformation over the past few years. Most of the vendors, though, have been geared towards the evolution of the data center network. It’s time that businesses started looking at evolving the wide area network (WAN) as this is often where the biggest pain points is for application performance.
The WAN fundamentally hasn’t changed at all in the past 30 years, as most companies still use the traditional “hub and spoke” design with a private network technology, such as MPLS. Often the WAN has a backup connection that becomes active when the primary fails. This model has worked well for decades now, so living by the “if it ain’t broke, don’t fix it” credo has meant that most companies just leave well enough alone and haven’t done anything to evolve the WAN.
I think it’s fair to say that most network managers understand why this architecture is inefficient. It was really designed for client/server traffic, and all Internet traffic is backhauled through a central location. Also, much of the traffic “trombones” up and down the WAN links through a central hub, moving from branch to branch or even Internet to branch. This is one of the reasons we’ve been talking about WAN re-design for years now. In my opinion, though, I think it’s time to take this seriously.