[ncc-services-wg] Re: [routing-wg] Analysis of the ‘Maximum Length’ Option in Certification ROAs

On 19 Apr 2011, at 21:40, Randy Bush wrote:

> hi alex,
> 
> one thing that interests me which i did not see in your analysis.  or
> maybe i just need more coffee.
> 
> how many, what proportion of, bgp announcements were for prefixes longer
> than the allocation in the roa and were properly described by a max-len?

Good question, let me look into that. 

Right now the analysis just focussed on the amount of prefixes that would be invalid because of incorrect usage of MaxLength, but it's quite likely a number of ROAs were created simply with /24 as MaxLength to allow for the freedom to deaggregate (or ease of use), when in reality the AS is only announcing a less specific aggregate. 

> as to your choices, i would go with 1 or 2 (make it a mandatory blank
> field, forcing the user to make an explicit decision).  3 and 4 are
> horrible.

Duly noted.

-A