On May 16, 2012, at 18:45 , Randy Bush wrote: >>> One could logically assume that if a caching server is within a >>> certain radius of a node geographically, they are likely able to >>> route to it (country boundaries/geography may change this, but I did >>> say roughly). >> >> This assumption is what leads folks to do what Pingdom has done. It >> is a common mistake to assume network topology matches geo-political >> topology. In many case, regulatory regimes, business rules, >> etc. result in the exact opposite. > > my favorite is that some root server operators intentionally limit bgp > announcement scope, so it does not even follow net topology, let alone > geo.
BGP has no notion of performance, latency, etc. In most cases, limiting announcements of a dense and widely distributed anycast deployment can greatly improve global performance. Put another way: Applying some intelligence to the announcements is far superior than following "net topology". -- TTFN, patrick _______________________________________________ dns-operations mailing list [email protected] https://lists.dns-oarc.net/mailman/listinfo/dns-operations dns-jobs mailing list https://lists.dns-oarc.net/mailman/listinfo/dns-jobs
