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DNS changes does not provides high availability at all. Even with a ttl of 60 seconds, if a cache decides to overwrite your TTL, you're screwed.

Real high availability comes with a price: redundant datacenter with BGP failover.

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While BGP is certainly better, the vast majority of DNS servers honor TTL nicely these days. In the old days, there used to be many problems, but I have been shocked at how well DNS failover has worked in the past few years.

How does that work? If you have a link explaining it a bit that would be great! (a Google search shows me all sorts of solutions for ISPs, but not for application hosting).

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