[sig-policy] prop-032-v001: 4-byte AS number policy proposal

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  • Subject: [sig-policy] prop-032-v001: 4-byte AS number policy proposal
  • From: "Kenny Huang" <huangk at alum dot sinica dot edu>
  • Date: Thu, 15 Dec 2005 10:48:03 +0800
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    • Dear SIG members,
      
      
      The following "4-byte AS number policy proposal" was received. Please feel
      free
      to review and comment on the proposal.  Please also sumit your proposal for 
      APNIC21 meeting.
      
      Regards
      
      Kenny Huang
      Policy SIG
      huangk at alum dot sinica dot edu
      
      
      ________________________________________________________________________
      
      prop-032-v001:   4-byte AS number policy proposal
      ________________________________________________________________________
      
      Authors:    Geoff Huston
      
      Version:    1
      
      Date:       15 December 2005
      
      SIG:        Policy
      
      
      
      Introduction
      -------------
      
      This policy proposal details a set of actions and associated dates for RIR
      AS number allocation policies to assist in an orderly transition to use of
      the 4-byte AS number space.
      
      
      Summary
      -------
      
      This policy proposal details a set of actions and associated dates for RIR
      AS number allocation policies to assist in an orderly transition to use of
      the 4-byte AS number space.
      
      The essential attributes of this policy proposal are to facilitate the ease
      of transitional arrangements by equipment vendors, network managers and
      network operations staff, to provide the industry with some predictability
      in terms of dates and associated actions with respect to registry
      operational procedures for AS number allocations.
      
      
      Background
      ----------
      
      Recent studies of AS number consumption rates indicate that the existing
      2-byte pool of unallocated AS numbers will be exhausted sometime in the
      period between 2010 and 2016, absent of any concerted efforts of recovery of
      already-allocated AS numbers [1] [2]. Standardisation work in the IETF has
      produced a document that is currently being submitted as a Proposed Standard
      that will expand the AS number space to a 4-byte field [3].
      
      It is noted that some advance period may be required by network operators to
      undertake the appropriate procedures relating to support of 4-byte AS
      numbers, and while no flag day is required in the transition to the longer
      AS number field, it is recognised that a prudent course of action is to
      allow for allocation of these extended AS numbers well in advance of an
      anticipated 2-byte AS number exhaustion date.
      
      
      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:   AS numbers in the range 0 - 65535
      
      4-byte only AS numbers:   AS numbers in the range 1.0 - 65535.65535
                                 (decimal range 65,536 - 4,294,967,295)
      
      4-byte AS numbers:        AS numbers in the range 0.0 - 65535.65535
                                 (decimal range 0  4,294,967,295)
      
      
      Proposal
      --------
      
      This policy proposal nominates 3 dates for changes to the current AS number
      allocation policy for the registry:
      
      1.  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.
      
      2.  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.
      
      3.  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.
      
           No other changes in AS number allocation policy are implied by this
           proposal.
      
      
      Pros/cons
      ---------
      
      The policy provides a clear indication of dates at which time 4-byte AS
      numbers will be available for use, and a date by which the transition to use
      of a larger 4-byte AS number pool is anticipated to be completed.
      
      
      Effect on APNIC
      ---------------
      
      This policy proposal is intended to respond to the predicted exhaustion of
      2-byte AS numbers by proposing an orderly and clearly predictable transition
      for APNIC members to the use of 4-byte AS numbers.
      
      
      References
      ----------
      
          [1]   Daily AS Number Report, http://www.potaroo.net/tools/asns
      
          [2]   ASNs MIA: A Comparision of RIR Statistics and RIS Reality,
                http://www.nanog.org/mtg-0510/wilhelm.html
      
          [3]   BGP Support for Four-octet AS Number Space, draft-ietf-idr-
                as4bytes-12.txt