The job of the GTM is the monitor the LTM and the LTM monitors the application instance. So, in your scenario, are you saying that the application fails, LTM notices, tells the GTM, then the GTM starts handing out the new available site, then the client fails because it never re-requests?
Correct, this is exactly what is happening and I know that the GTM won't hand out the broken IP, that is not my intention. Ideally, I would like to have the IP be the same or move (as you suggested) to the other site, so that we do not have to depend on the client to re-request the IP. Just wasn't sure how to do that with the GTM. Thanks.