How to get external users to our hosted Web sites during a Multi-Wan Failover

We are looking at adding a secondary ISP for our network and I have a question about configuring our network. We host several Web sites to support our business with 100+ concurrent users typically using our sites. I am wondering what needs to be done to allow users to continue using our Web sites during a fail-over situation when external DNS servers point to our static IPs that are on our primary ISP connection. How do these users get routed via the secondary ISP path? If someone could point me to a good article about how to setup this secondary ISP feed and get external access to route through the secondary ISP during a fail-over would be great! Thank you!


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