Difference between Traditional WAN & SD WAN
Below table summarizes the difference between Traditional WAN and SD WAN technologies:
|Bandwidth Crunch||When Bandwidth chokes due to high utilization by users or applications , following is the approach followed –
·WAN Optimization solution is introduced which incurs
·WAN Bandwidth is increased or additional link is taken.
|When Bandwidth Customer location chokes , following is the approach followed –
·SD-WAN along with WAN Optimization module performs wan acceleration. Additionally utilizes bandwidth from secondary links to provide better experience to users and Applications.
|Provisioning||Link and device provisioning time for new office setup is very high||Very low time for device configuration and new office setup|
|Configuration||Manually performed by skilled resources who need to have clear understanding on vendor specific device CLI.||Concepts like “Zero Touch Provisioning” allow configuration automatically downloaded by new device via single click.|
|Cost impact (OPEX and CAPEX)||High Cost since reliance on MPLS or PTP links. Also, may require dedicated links for mission critical or business application traffic.||Cost saving by using low cost Internet links instead of using MPLS or PTP links. No dedicated links need to be provisioned for mission critical or business application traffic.|
|Operational overhead and errors in configuration||High since each device needs to be managed and configured separately and errors in configuration is high.||Through automation operation and configuration cost has reduced and errors in configuration becomes low due to automation.|
|Performance of Applications in Cloud||Low since Branch Sites need to backhaul to Hub Sites and then||High since Branch Sites directly access applications hosted in Cloud reducing delay. Also, sophisticated path conditioning techniques that can reconstruct packets lost in transit, avoiding re-transmission will improve the user experience accessing applications.|
|Application level visibility||Low visibility of Application performance. Customer needs to buy a solution separately to meet this requirement.||SD-WAN solutions not only provide deep application intelligence but also give IT the ability to align application priority and performance to business intent|
|Consistent Policy for QOS and Security control across all locations of organization||Medium consistency level of QOs and Security control across locations||High level of QOS and Security policy control since all is centrally managed and pushed through central orchestrator which leads to consistency across all locations.|
|IT Infrastructure Service||Traditional WAN includes multiple single-function devices connecting via different WAN links. This leads to complexity of branch IT management and more number of devices to maintain.||SD-WAN tends to integrate services and centralize the control of services which tends to reduce number of devices to manage.|