[ppml] Use of HD ratios (esp. 0.94)

[Geoff Huston]

Brian,


[...]

> However, at review time, both have a threshold of 36.9% utilization.
> The presumption is that ISP A's assignments are 100% utilized.


The intent of the use of /56 in the efficiency metric was to provide a 
common mechanism to measure the efficiency of end-site prefix 
assignments irrespective of the size of individual end site assignments, 
and explicitly not to measure the efficiency of address assignments to 
hosts.

i.e the presumption in terms of this end site prefix efficiency measure 
is that the assignments with end-sites are not the subject of the review.


regards,

   Geoff Huston