Tested with OCP build 3.4.1.0 Issue has been fixed. No IP flip-flop in master log, and the route can be accessed without 503.
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://access.redhat.com/errata/RHBA-2017:0218