Failover how much complexity will it add?

[randy at psg.com (Randy Bush)]

> It has been routinely observed in nanog presentations that settlement
> free providers by their nature miss a few prefixes that well connected
> transit purchasing ISPs carry.

just trying to understand what you mean,

  o no transit-free provider actually has all (covering) prefixes needed
    to cover the active space, but

  o one or more reasonably small subsets of the set of transit-free
    providers do cover the whole active space.

randy