On 03/05/2010 01:48 PM, David Conrad wrote:
On Mar 5, 2010, at 10:44 AM, Joel Jaeggli wrote:
If this is done right, direct assignment holders and ISPs are issued sufficiently large prefixes such that the prefix count per entity remains small.
This sort of assumes Internet connectivity models of today, specifically that most address assignments are singly-homed and thus can be aggregatedd within a larger provider independent block, will remain the model of tomorrow. I have some skepticism this will be true. When entertainment, communications, monitoring, etc. are all provided via always-on IP connectivity, I suspect you'll see folks have less tolerance for even momentary outages.
Multihoming while protecting your overall availabity isn't going to solve your momentary outage issue, convergence takes time (see bgp wedgies)... precomputed backup paths are of course the current cause celebre whether that be in intra-domain mpls or ipfrr. one can end-up quite deep down a rat-hole depending on the depth of the alternative paths that might be choosen to be computed. It would be deeply ironic I suppose of ipfrr were to produce new opportunities for instability that are more destructive than micro-loops currently are.
And that's not even considering mobility solutions that rely on the routing system (e.g., stuff like Boeing's Connexion (RIP)).
Having the mobility agent for your airplane appear in the DFZ while cool was a fairly bad idea. There are in fact a surprisingly small number of objects which make rapid transcontinental transitions. and I'm personally of the belief that the DFZ routing table isn't really the place to solve that problem, for the same reason we don't solve the cellular mobility problem there either.
We'll see I suppose.
Regards, -drc