[apops] Re: The Cidr Report

  • To: nanog at merit dot edu, eof-list at ripe dot net, apops at apnic dot net, routing-wg at ripe dot net
  • Subject: [apops] Re: The Cidr Report
  • From: Tony Bates <tbates at cisco dot com>
  • Date: Sun, 11 Feb 2001 21:26:46 -0800
  • In-reply-to: <200102120437.UAA18005 at lovefm dot cisco dot com>
  • Sender: owner-apops@lists.apnic.net
    • So after a while of not working properly, the cidr-report should now be 
      fixed. In fact it has been working but because it is taking almost a day to 
      generate the data mainly because
      of all the whois lookups the report has been misleading in that it looked 
      like the info wasn't
      there where in fact it was from the day before. A few things I want to 
      point out about the
      report.
      
      1) It is not as useful as it used to be (even when it is working ;-)). Why ?
      
      Firstly, when I started the report (6 or 7 years ago) I made a simple 
      assumption that
      when ISPs advertised classles (as opposed to traditional classful A,B or C) 
      routes there
      was a need for it as they had to go out of their way to configure it so 
      essentially I
      ignored these routes in the AS aggregation calculations. Today, this does 
      not hold true
      anywhere as much as it used to.
      
      Secondly, it always makes the assumption  that you can aggregate at the
      source AS level which for some providers is clearly not true for all routes.
      
      I need to  look at changing the above assumptions  in future  reports to 
      see what
      this does to potential savings. I expect it could be quite high.  Even 
      today with the
      simple assumptions above it appears to be a gain of 11,000 routes for 
      just  54,000
      classful routes  advertised.
      
      2) It seems folks don't use it as much as they can as I see very little 
      positive changes anymore.
      
      However, having said this I would like to understand from folks (reply 
      directly) if you
      think I should continue to generate this.
      
      Note also that in interesting aggregates section (see web page) this is 
      also not as
      interesting (as it uses the same assumption above) as it used to be. 
      However, it is
      worth having a quick look for config errors and would encourage providers 
      to do this
      periodically.
      
                               --Tony
      
      
      At 08:37 PM 2/11/2001 -0800, Tony Bates wrote:
      
      >This is an auto-generated mail on Sun Feb 11 20:37:22 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
      >perform.
      
      ....
      
      >1) Gains by aggregating at the origin AS level
      >
      >  --- 11Feb01 ---
      >ASnum    NetsNow NetsCIDR  NetGain  % Gain   Description
      >
      >AS1221      1623     1207      416   25.6%   Telstra Pty Ltd
      >AS701       1642     1451      191   11.6%   UUNET Technologies, Inc.
      >AS271        280      132      148   52.9%   University of British Columbia
      >AS7545       196       71      125   63.8%   ASNBLK-APNIC-AS-2-BLOCK
      >AS9269       162       46      116   71.6%   ASNBLK-APNIC-AS-3-BLOCK
      >AS6429       221      108      113   51.1%   RdC Internet
      >AS6595       163       62      101   62.0%   DoD Education Activity Network As
      >AS8013       434      336       98   22.6%   PSINet Ltd. Canada
      >AS13999      107       10       97   90.7%   Mega Cable S.A. de C.V.
      >AS4293       374      281       93   24.9%   Cable & Wireless USA
      >AS7496       104       23       81   77.9%   ASNBLK-APNIC-AS-2-BLOCK
      >AS4151       250      169       81   32.4%   USDA
      >AS705        312      234       78   25.0%   UUNET Technologies, Inc.
      >AS4755       209      137       72   34.4%   Videsh Sanchar Nigam Ltd. Autonom
      >AS1942       137       65       72   52.6%   FR-CICG-GRENOBLE
      >AS7018       615      544       71   11.5%   AT&T
      >AS7046       325      255       70   21.5%   UUNET Technologies, Inc.
      >AS577        236      167       69   29.2%   Bell Advanced Communications Inc.
      >AS174        499      431       68   13.6%   PSINet Inc.
      >AS1727       162       94       68   42.0%   Commander Naval Surface force US
      >AS9498        88       21       67   76.1%   BHARTI BT INTERNET LTD.
      >AS724        219      152       67   30.6%   DLA Systems Automation Center
      >AS5106       101       37       64   63.4%   Ameritech Advanced Data Services,
      >AS3464       153       92       61   39.9%   Alabama SuperComputer Network
      >AS7657       185      125       60   32.4%   ASNBLK-APNIC-AS-2-BLOCK
      >AS226        155       95       60   38.7%   Los Nettos
      >AS3749       115       57       58   50.4%   Tennessee Board of Regents
      >AS16758       63        6       57   90.5%   IKON Office Solutions
      >AS6413        67       11       56   83.6%   Southern Online Systems, Inc.
      >AS376        131       75       56   42.7%   Reseau Interordinateurs Scientiqu
      
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