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Re: ISP support for use of 4-byte ASNs in peering
From: Nick Hilliard <nick () foobar org>
Date: Tue, 09 Aug 2011 15:24:26 +0100

On 09/08/2011 14:47, John Curran wrote:
  At ARIN, we are still having parties returning 4-byte ASN's (seeking 2-byte instead),
  indicating that the 4-byte ones are not sufficiently accepted in peering to be usable.  
  This is obviously a less than desirable situation, and it appears that it is not trending 
  towards resolution at this time.

At INEX, we see 60% of IXP connections which can handle ASN32 natively.
However, INEX is a small IXP and I haven't seen similar figures from other
IXPs which could validate this 60/40 split.

Having said that, in the IXP world most new service providers connect into
route servers, so there is often no perceived requirement for direct
ASN32->ASN16 interconnection - the intersection of new service providers
and ASN32 holders is quite large.  And if you really want a bilateral
peering relationship, there's no reason not to use AS23456.

Thoughts?

- interior BGP community management is great fun with an ASN32, oh yes.

- i don't have much sympathy for people who whine about not being able to
support ASN32 peerings.  There is no good reason for this these days.

- from personal experience, I understand why ASN32 is less popular.
However, it's certainly usable.

Nick



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