IPv6 for IXPs

Randy Bush writes:
 > > - a /48 in most cases
 > > - a /64 if it is known that there will only be one subnet
 > > (basically following the IAB recommendation)
 > 
 > i suspect the 'most cases' is the /64, a single exchange mesh, and that the
 > multiple interconnected meshes, which whould need the /48, is a rare case.

Well, I'd think it's more the case that a /64 is "single now, and
never plans to need more" and /48 is "likely to need some more in
future", thus shifting "most cases" towards /48.

Robert