Re: [Idr] WGLC on draft-ietf-idr-as-private-reservation-00

[Brian Dickson <[e-mail]>]

On Wed, Dec 12, 2012 at 12:53 PM, Nick Hilliard <[e-mail]> wrote:

> On 12/12/2012 17:03, David Farmer wrote:
> > I think the proposed range is more than reasonable, 4,278,190,080 to
> > 4,294,967,294.
>
> Dave,
>
> could you please provide me with a regexp which matches exactly 4278190080
> to 4294967294?
>

In as-dot notation, it would be (modulo the regexp language syntax for your
CLI):

652[89]?.* | 65[34]??.* | 655[012]?.* | 6553[0-5].*

(65280.* through 65535.*)

This is every bit as easy (actually a bit easier) to do as a regexp, as the
current 16-bit reserved ASNs are:
6451[2-9] | 645[2-9]? | 64[6-9]?? | 65[0-4]?? | 655[0-2]? | 6553[0-5]

Of course, the general rule of how many separate regexp elements (separated
by |) it would take,
can be determined by the odometer rule:
o  How many carry-over rolls are there in the range? (Those are x99* to
(x+1)00*.)
o       Ignore intermediate rolls between two rolls of increasing length
o       Obey "price is right" rule - don't use a roll if it takes you
"over" the high number
o  That number, plus (up to) two, if the low number does not end in 0,
and/or high number does not end with 9.
o  So, for the ranges above in as-plain, it is about 15 or so.
o  Not really horrible, and you only have to build it once. The great thing
about constants -- they don't change.

(Not sure, but I think the upper range limit should be 2^32-1, or
4294967295.)

Brian