What is the best way to configure the utilization of dual 100MB ISP' s with failover?
set both for same weight?
set guaranteed bandwidth?
also need to failover all traffic to working wan when one is down.
anyone have experience with this setup?
What version of code are you running?
If 5.2 you can create a virtual WAN link.
Otherwise, you can do ECMP (equal cost multipathing) and give them the same weight and set the dead peer detection to know if one goes down (as well as spillover for load balancing or failover)
You'll also want to look at the ordering of the interfaces. Spillover will only go between a higher-ordered and a lower-ordered interface. For instance, on my FortiGate 60C, if I enter 'show system interface', DMZ appears first, followed by WAN2, then by WAN1. I could not enable ECMP spillover balancing from WAN1 to WAN2, since WAN2 appears first in the list - only from WAN2 to WAN1.
It may mean you'll need to re-architect your topology (move addresses, policies, and routes) to favor WAN2, in order to spill over to WAN1 based on the threshold you set for the primary link's bandwidth.
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