Kenneth,
You have the "Main" SA server configured on the Background Server called "BGServer" and configured on Standby Server called "SBServer".
Instead of pointing the url to a either server specifically you have an outside redirect configuration set up on a load balancer, let's say the redirect DNS was "SAServer". "SAServer" would need to be set up to redirect to whichever is the current Background server, and then you'd specify the "SAServer" url in the Options Manager.