On 08 Nov 2010 22:49, Ted Mittelstaedt wrote:
> Obviously Comcast would have never qualified for a /9 when they were
> first getting started. So they must have renumbered dozens of times
> as they got larger and worked their way up in size, qualifying for
> larger and larger allocations.
> It must have been holy hell on their customers to have to go through
> all that renumbering, though.
There is no policy that _requires_ an org to return smaller
allocations/assignments when they qualify for a larger one. As you
note, that would cause a lot of renumbering as the org grows. Policy
_allows_ orgs to exchange multiple smaller blocks for a single larger
one, but I suspect that's fairly rare.
This is the primary reason why the prefix:AS ratio is so high with
IPv4. That is also the reason why the goal is to give ridiculously
large IPv6 blocks: to keep the prefix:AS ratio as low as possible.
Stephen Sprunk "God does not play dice." --Albert Einstein
CCIE #3723 "God is an inveterate gambler, and He throws the
K5SSS dice at every possible opportunity." --Stephen Hawking
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