IP4 Space

Joel Jaeggli joelja at bogus.com
Thu Mar 4 13:12:01 CST 2010


On 03/04/2010 10:52 AM, Thomas Magill wrote:
> 2.       Longer than /24 prefixes in global BGP table.  The most obvious
> answer is that some hardware may not handle it...  How is that hardware
> going to handle an IP6 table then?  I have had several occasions where
> functionally I needed to advertise for different sites but only needed
> 20-30 addresses which is a complete waste of a /24.  How hard would it
> be to start allowing /25s when compared to trying to roll out IP6?

prefix deaggregatation beyond /24 is probably inevitable but that
doesn't mean you want people to burn routing table slots on your
equipment for /28s. That routing table slot is an externality that
everyone has to pay for. By holding the line to the extent that it is
held, a cap of the growth rate of your dfz fib that is roughly congruent
with rir policy.

handling the v6 table is not currently hard (~2600 prefixes) while long
term the temptation to do TE is roughly that same in v6 as in v4, the
prospect of having a bunch of non-aggregatable direct assignments should
be much lower...





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