As hot a trend as suppliers believe software-defined wide area networks (SD-WANs) might be, there is a recurring question about the impact of new SD-WAN deployments on existing business data networks such as MPLS.
Some argue SD-WAN will have most impact in the smaller business or remote enterprise location segment of the market, in terms of new account growth, in large part because SD-WAN might enable deployment at lower cost.
Others might argue SD-WAN also might limit the growth of new MPLS deployments, as SD-WAN will allow aggregation of location bandwidth (internet and MPLS). So, in some cases, additional capacity requirements could be met by adding SD-WAN, not additional MPLS resources. In that view, SD-WAN will have the primary impact of limiting additional MPLS growth.
Perhaps some will argue that SD-WAN can replace MPLS. As with most new technology trends, all three developments will happen, simultaneously. Longer term, the issue is less clear.
Many important new technologies develop first as lower-functionality alternatives to existing high functionality platforms. Over a period of time, those new alternatives begin to move in the direction of higher quality and more features, until, eventually, they become full substitutes for legacy products.
That is not a certainty for SD-WAN, but it is unwise to ignore human cleverness and platform evolution. Still, most would acknowledge, as a sheer matter of physics, that SD-WAN cannot control core network quality of service, whatever it is able to do at the edge of the core network.
The issue is how many use cases that will be good enough to support.
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