[arin-ppml] Policy Proposal: Extend 16 bit ASN Assignments

Leo Bicknell bicknell at ufp.org
Thu May 7 17:14:31 EDT 2009

In a message written on Thu, May 07, 2009 at 03:57:03PM -0500, Kevin Kargel wrote:
> My understanding of the current Cisco code we are using {12.2(33)} is that
> it will route with 32bit ASN's it gets from BGP with no issue, but that I
> can only enter a 16 bit ASN in to my config.  I haven't quite figured out
> why this disparity exists.

The answer is, "it's complicated."

Google for "ASN 23456" to get some of the information.  The short
form is that a 32 bit ASN can pass through a 16 bit ASN only network
by using ASN 23456 and some transitional magic.

Lots of people who think they need /all/ of their devices to support
32 bit ASN's do not, although depending on how you use these
transition mechanisms it may complicate your path to move to 32 bit
clean code.

       Leo Bicknell - bicknell at ufp.org - CCIE 3440
        PGP keys at http://www.ufp.org/~bicknell/
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