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

Gert Doering wrote on 29/05/2019 16:45:
> IXPs say they need globally unique space, and they are the experts here.

 From an architectural point of view, it's a good idea to use publicly 
registered numbering resources when interconnecting with third parties. 
IXPs are an extreme case of this because the same resource block is used 
to connect to multiple parties at the same time.

One of the reasons this can cause problems is that the address block of 
the peering LAN often ends up redistributed in the IXP participant's 
routing tables.  Lots of organisations redistribute rfc1997 address 
space internally in their own networks for their own purposes, so if 
this conflicts with the IXP peering LAN address block, the organisation 
is going to end up with connectivity problems.  There are other reasons 
this can cause problems, but this is one of the more obvious ones.

Nick