Sunday, October 7, 2018

Hybrid WAN to SD-WAN - ISP managed VPN selection. L3VPN vs VPLS.

Lets say that you've got a hybrid WAN deployment. For example most remote sites have a DIA and an L3 MPLS VPN provided by a regional carrier. You also have a regional hub in each region.

You are looking to deploy an SD-WAN overlay on top of this in order to provide better service by intelligently routing traffic based on application requirements, while doing TCP opt, and other benefits. You still have a requirement to keep a private circuit with decent SLAs at each site for when the DIA goes tits-up.

If you are talking about tens of sites in a region (Not running into VPLS scalability problems), is there any other reason NOT to use VPLS? (Assuming speeds/feeds/queues are comparable).

Generally I'm seeing significantly better pricing for L2 circuits, and for better speeds. Assuming similar SLAs and queues, I can't think of any reason NOT to use VPLS for a regional WAN. I also don't consider the "complexity" of managing the routing on the VPLS to be an issue. We are an international org with in-house network staff who are capable.

Any thoughts on this?



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