Steve, [as a co-author, if it's ok] ASBR is defined (as "AS boundary router") in RFC2328, which is a normative reference, i.e., a must-read. -- Alex Tuesday, February 04, 2003, 6:10:22 PM, Steve Bellovin wrote: > ASBR is used but not expanded, ever. > --Steve Bellovin, http://www.research.att.com/~smb (me) > http://www.wilyhacker.com (2nd edition of "Firewalls" book)