On 2008-08-21 20:16, Iljitsch van Beijnum wrote: > On 20 aug 2008, at 18:45, Scott Brim wrote: > >> Identifiers are >> primarily useful for multipath management and session continuity. >> Identifiers may be in the network layer, and carried in network layer >> packet headers, for convenience of the endpoints, but that doesn't >> mean they should be included in routing information. > > Well, then the question is: do we look up locators based on these > identifiers? > > If no, then they purely function on the transport and higher layers and > have no relationship to the network layer so they might as well not > exist for our purposes. > > If yes, they need to have some hierarchy or have a very low granularity > so their total number remains low in order to make the lookup function > scale.
Is there any reason that we can't use the Paul Francis/CRIO style of virtual aggregation in a mapping system? That would be easier to understand and describe than a DHT, but would deal reasonably well with the granularity issue. There are also some interesting ideas in SiMIA that might move across to a mapping system. On 2008-08-22 03:01, Eliot Lear wrote: > Yakov Rekhter wrote: >> I'd like to pose the following two questions: >> >> 1. Do folks agree that to get to the point where 2^48 PI spaces >> would become a reality is likely to require *massive* deployment of >> v6-to-v4 NAT ? >> > > No. And there is a solution on the table that demonstrates this. Well, that does depend on the real scalability of the mapping system if the PI/EID space is highly fragmented. See above. > > [And while the answer would remain the same, 2^48 PI spaces seems just a bit > large. Not necessarily a bad thing, mind you. The population of the earth > is 2^33.] It does, but 2^33 prefixes sparsely arranged in a 2^48 space is an issue. See above. However, would a lower estimate, say 2^23 (8 million) prefixes be an issue? If not, why can't we start on the assumption that we know how to support a map with 8 or 10 million entries, and have many years to figure out a sparse mapping system with several orders of magnitude more entries? Brian -- 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