[apops] The Cidr Report

  • To: nanog at merit dot edu
  • Subject: [apops] The Cidr Report
  • From: Tony Bates <tbates at cisco dot com>
  • Date: Fri, 26 Jan 2001 12:00:03 -0800
  • Cc: tbates at cisco dot com, eof-list at ripe dot net, apops at apnic dot net, routing-wg at ripe dot net
  • Sender: owner-apops@lists.apnic.net
      This is an auto-generated mail on Fri Jan 26 12:00:00 PST 2001
      It is not checked before it leaves my workstation.  However, hopefully 
      you will find this report interesting and will take the time to look 
      through this to see if you can improve the amount of aggregation you 
      The report is split into sections:
         0) General Status
            List the route table history for the last week, list any possibly
            bogus routes seen and give some status on ASes.
         1) Gains by aggregating at the origin AS level
            This lists the "Top 30" players who if they decided to aggregate
            their announced classful prefixes at the origin AS level could 
            make a significant difference in the reduction of the current 
            size of the Internet routing table. This calculation does not 
            take into account the inclusion of holes when forming an aggregate
            so it is possible even larger reduction should be possible.
         2) Weekly Delta
            A summary of the last weeks changes in terms of withdrawn and
            added routes. Please note that this is only a snapshot but does 
            give some indication of ASes participating in CIDR. Clearly,
            it is generally a good thing to see a large amont of withdrawls.
         3) Interesting aggregates
            Interesting here means not an aggregate made as a set of 
            classful routes.      
      Thanks to xara.net for giving me access to their routing tables once a
      Please send any comments about this report directly to me.
      Check http://www.employees.org/~tbates/cidr-report.html for a daily
      update of this report.
                              CIDR REPORT for 26Jan01
      0) General Status
      Table History
      Date	Prefixes
      190101	95598
      200101	95336
      210101	95386
      220101	95447
      230101	96665
      240101	96583
      250101	96891
      260101	96902
      Check http://www.employees.org/~tbates/cidr.plot.html for a plot
      of the table history.
      Possible Bogus Routes
      *** Bogus from AS11770
      AS Summary
      Number of ASes in routing system:                 9727
      Number of ASes announcing only one prefix:        5673 (3187 cidr, 2486 classful)
      Largest number of  cidr routes:                    967 announced by  AS701
      Largest number of classful routes:                1624 announced by  AS701
      1) Gains by aggregating at the origin AS level
       --- 26Jan01 ---
      ASnum    NetsNow NetsCIDR  NetGain  % Gain   Description
      For the rest of the previous weeks gain information please see
      2) Weekly Delta
      Please see
      for this part of the report
      3) Interesting aggregates
      Please see
      for this part of the report
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