Create an NTLM machine account for BIG-IP within a route-domain

Thanks for the swift reply youssef. The workaround looks straightforward enough. Create 2 VS (port 689 and 88) in Route Domain 0. The pool used for these VS'es is pointed to the KDC in the customers route-domain. But where to go next? When adding the Big IP system to the domain, do I point to the Big IP VS address instead of the FQDN of the DC server?