Sorry I'm not man enough...err savvy enough to know the man page ways
to write the needed lingo.

Could somebody update the man page for route with the following gist:

     In a change or add command where the destination and gateway are not suf-
     ficient to specify the route, the -ifp or -ifa modifiers may be used to
     determine the interface or interface address.

+     -ifa specifies an interface by its IP address (not name).
+
+     -ifp specifies an interface by name and link layer address:
+
+          -ifp interface name:link layer address
+
+          example:
+
+          route add 192.1.2.3 10.10.0.34 -ifp em0:08:00:69:ff:ff:ff

dmo