In "Re: [RRG]", responding to Tony's message of 22 March: http://psg.com/lists/rrg/2008/msg00964.html
Michael Meisel wrote, in part: > (1) Is the mapping function successful in preventing edge > network reachability from being propagated into the > global routing system? > > (2) If yes, does it do so without simply moving the problem > to the global mapping system? > > Note that proposals that both (a) put reachability information into the > mapping system and (b) involve any sort of push model start to look a > lot like BGP, and therefore are going to have a hard time answering > "yes" to (2) convincingly. I think a good proposal should provide a Yes answer for (1) and may well provide Yes for (2), as Ivip does. Ivip's mapping information is a single ETR address. If that ETR becomes unreachable, the end-user (or some system they nominate) uses the global fast hybrid push-pull mapping distribution system to change the mapping to point to another ETR. If Ivip's mapping distribution system was as costly, slow and generally problematic as BGP's way of communicating route changes globally, then a Yes answer to 2 would indicate that nothing of great value had been achieved. (BGP has to do it this way, since each router in the system needs to make its own decisions, which depend on the decisions of other routers.) However, Ivip's mapping distribution system is completely different from how BGP works and is optimised to handle much greater flows of information, faster and more reliably than BGP. http://tools.ietf.org/html/draft-whittle-ivip-db-fast-push-00 When trying to frame questions about something like the "mapping function", as we get down to questions which provide meaningful answers regarding important principles and implementation details, I think the questions only tend to make sense if certain architectural attributes can be assumed. I find it hard to think of common questions which tell us anything meaningful about the five current map-encap schemes - LISP-NERD, LISP-ALT, APT, Ivip and TRRP. My message a week ago: http://psg.com/lists/rrg/2008/msg01091.html Taxonomy: 25 questions had several questions which teased out commonalities and differences in the mapping systems of these proposals. - Robin http://www.firstpr.com.au/ip/ivip/ -- to unsubscribe send a message to [EMAIL PROTECTED] with the word 'unsubscribe' in a single line as the message text body. archive: <http://psg.com/lists/rrg/> & ftp://psg.com/pub/lists/rrg
