or, use link-local address on IX switch as documented in

Unfortunatly, that technique does not have broad commercial
implementation. In addition, there was some pushback from
the IETF IDR wg on using this technique. So its still a bit
"iffy", although a very elegent "haq". (we used it in LA
for a while but could not get folks to adopt it.)

  cisco IOS can do it, IIRC. i'm always doing it with zebra .
  anyway, i'm not sure if it fits "broad implementation", so i'll stop.