For a long time, most enterprises treated deployment of SD-WAN as a replacement to their legacy routers in order to enable traffic engineering on multiple WAN links. They were still forced to manage point products like WAN optimizers, firewalls and legacy switches in addition to SD-WAN, hoping to deliver better connectivity and performance, without the pain of replacing them with a unified solution. Industry reports show that this was the norm across organizations – a phased transition instead of bold replacement.
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