Route Server Filters at IXPs and 4-byte ASNs

Wed Feb 5 09:06:31 UTC 2014

Jeffrey,

On Tue, 4 Feb 2014 22:53:40 -0500
Jeffrey Haas <jhaas at pfrc.org> wrote:

> 
> 
> Sent from my iPad
> 
> > On Jan 25, 2014, at 1:37 PM, Nick Hilliard <nick at foobar.org> wrote:
> > 
> >> On 25/01/2014 15:48, Sebastian Spies wrote:
> >> To make things worse: even if the IXPs ASN is 2-byte, I would assume,
> >> that RS implementors chose to interpret extended community strings as
> >> always being in the format 4-byte:2-byte (see RFC5668).
> > 
> > some ixp operators (e.g. me) are rather enthusiastic about the idea of a
> > modified form of draft-raszuk-wide-bgp-communities getting more traction.
> > This would solve this particular problem and many others.
> > 
> 
> Wide communities is the wrong tool here. You want this:
> http://tools.ietf.org/html/draft-ietf-idr-as4octet-extcomm-generic-subtype-06

This draft does not cater for the use case of describing a 32-bit ASN peering
with a 32-bit route server, which would require a 4-byte Global Administrator
as well as a 4-byte Local Administrator sub-field.

Kind regards,
Martin