[ppml] Proposed Policy: 4-Byte AS Number Policy Proposal

[Geoff Huston]

Andrew,

I haven't been able to identify any long standing issues with 2-byte / 
4-byte number interaction that would merit any further efforts to 
distinguish between the two number pools post 2010. Yes, existing software 
from many vendors cannot today support a local 4-Byte AS number (although 
they can operate quite happily in the situation where other AS numbers 
deploy 4-Byte AS's), but I am of the view that its reasonable to anticipate 
some form of software rollover in the intervening period in those 
situations where the local AS number itself is rolled over.


regards,

    Geoff




At 04:23 AM 13/12/2005, Andrew Dul wrote:
>This is proposed as a temporary policy, which to me means that if the 
>policy is approved at some point it will automatically be removed from the 
>NPRM on 1/1/2010.  Which means we will then only have the current AS 
>number policy.  Does everyone feel that the current text will then be 
>sufficient in a 4 byte world?  Or do we need additional text to deal with 
>the new issues in a 4-byte world?
>
>Andrew
>
>
>***************************
>NRPM
>***************************
>
>5. AS Numbers
>
>There are a limited number of available Autonomous System Numbers (AS 
>Numbers), therefore, it is important to determine which sites require 
>unique AS Numbers and which do not. Sites that do not require a unique AS 
>Number should use one or more of the AS Numbers reserved for private use. 
>Those numbers are: 64512 through 65535.
>
>In order to be assigned an AS Number, each requesting organization must 
>provide ARIN with verification that it has one of the following:
>
>    1. A unique routing policy (its policy differs from its border gateway 
> peers)
>    2. A multihomed site.
>
>AS Numbers are issued based on current need. An organization should 
>request an AS Number only when it is already multihomed or will 
>immediately become multihomed. Details regarding requirements, fees, and 
>applying for an AS Number can be found on the Guidelines for AS Numbers page.
>
>*******************
>
>
> >
> >  Policy Proposal Name:
> >
> >           4-Byte AS Number Policy Proposal
> >
> >  Author: Geoff Huston
> >
> >
> >  Policy Term:
> >
> >           Temporary (1 January 2007 - 1 January 2010)
> >
> >  Policy Statement:
> >
> >           This policy proposal nominates 3 dates for changes to the
> >           current AS Number allocation policy for the registry:
> >
> >           On 1 January 2007 the registry will process applications that
> >           specifically request 4-byte only AS Numbers and allocate such
> >           AS Numbers as requested by the applicant. In the absence of
> >           any specific request for a 4-byte only AS Number, a 2-byte
> >           only AS Number will be allocated by the registry.
> >
> >           On 1 January 2009 the registry will process applications that
> >           specifically request 2-byte only AS Numbers and allocate such
> >           AS Numbers as requested by the applicant. In the absence of
> >           any specific request for a 2-byte only AS Number, a 4-byte
> >           only AS Number will be allocated by the registry.
> >
> >           On 1 January 2010 the registry will cease to make any
> >           distinction between 2-byte only AS Numbers and 4-byte only AS
> >           Numbers, and will operate AS number allocations from an
> >           undifferentiated 4-byte AS Number allocation pool.
> >
> >           Nomenclature
> >
> >           It is proposed to identify 4-byte AS Numbers using a syntax of
> >           <high order 16 bit value in decimal>:<low order 16 bit value
> >           in decimal>. Accordingly, a 4-byte AS number of value 65546
> >           (decimal) would be identified as "1:10".
> >
> >           Terminology
> >
> >           "2-byte only AS Numbers" refers to AS numbers in the range 0 -
> >           65535
> >
> >           "4-byte only AS Numbers" refers to AS Numbers in the range 1:0
> >           - 65535:65535 (decimal range 65,536 - 4,294,967,295)
> >
> >           "4-byte AS Numbers" refers to AS Numbers in the range 0:0 -
> >           65535:65535 (decimal range 0 - 4,294,967,295)
> >
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