This week’s Post of the Week is based on the post GTM and IP selection by poster cknail.  He was looking for a solution to hand out the same IP address for LTM virtual servers in different data centers, in support of devices that don’t honor the short TTL asserted by GTM.  After an interesting discussion by several F5 engineers regarding the interplay between LTM and GTM regarding monitoring VS status, it turns out that the best solution is LTM only with the ARM (Advanced Routing Module) licensed and configured to provide Route Health Injection based on LTM monitoring results for virtual server peers on a BGP or OSPF peering network.