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Created on 06-21-2024 11:39 AM Edited on 06-21-2024 11:49 AM
If you only care about two ISP redundancy at those three locations where two internet circuits terminate, I would put only those two circuits into an SD-WAN zone and set up an appropriate method to fail-over or load balance.
But if you want to re-route the internet bound traffic via another location when both two circuits go down, you probably need a routing protocol to advertise local subnets to wherever the internet egress at that time, in addition to getting a default route.
SD-WAN member circuits use static default routes so it always wins over the default route advertised over the routing protocol from a neighboring location. Then only when both went down it would "float" up.
Toshi
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