[address-policy-wg] 2019-05 New Policy Proposal (Revised IPv4 assignment policy for IXPs)

Hi,

I have compiled an in-depth analysis of peeringdb data. You can find a
full description of the method, scripts, data and the main results on
github:

https://github.com/mwichtlh/address-policy-wg/

Some interesting takeaways:

* Roughly 83% of all IXPs would theoretically fit into a /25. This
already includes 100% overprovisioning, i.e., 2xconnected ASes/IXP. At
the same time, 74% of all peering LANs are /24s. Consequently, the
default policy of assigning /24s has created large amounts of unused
space.

* Already today, more than 10% of all peering LANs are smaller or equal
a /25. Having small peering LANs is not entirely unusual.

* Large IXPs requiring a /23 or larger are rare (<3%). Thus, lowering
the upper bound for assignments to /23 will not save large amounts of
space.

Conclusions:

I back the proposal except for the limitation to a /23. I propose
having a /21 as an upper limit with thorough checks by RIPE.

Regards,
Matthias

On Wed, 2019-06-05 at 03:47 -0700, Randy Bush wrote:
> > > Hmm.. why shouldn't defunct IXPs not be taken in consideration
> > > though?
> > 
> > Because they will have handed back their address space.
> 
> what are you trying to measure?  the space utilization of current
> operating exchanges, or the distribution of request sizes?
> 
> randy
> 
-- 

Dr.-Ing. Matthias Wichtlhuber
Researcher
------------------------------
DE-CIX Management GmbH 
Lindleystr. 12, 60314 Frankfurt (Germany) 
phone:	+49 69 1730902
mobile:	+49 171 3836036
fax:	+49 69 4056 2716
e-mail:	matthias.wichtlhuber at de-cix.net
web:	www.de-cix.net
------------------------------
DE-CIX Management GmbH 
Executive Directors: Harald A. Summa and Sebastian Seifert 
Trade registry: District court (Amtsgericht) Cologne, HRB 51135
Registered office: Lichtstr. 43i, 50825 Cologne