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The Cidr Report

  • From: Tony Bates
  • Date: Sat Mar 31 02:10:24 2001


This is an auto-generated mail on Fri Mar 30 23:00:00 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 
perform.

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      A summary of the last weeks changes in terms of withdrawn and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
day. 

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 30Mar01


0) General Status

Table History
-------------

Date	Prefixes
230301	98100
240301	99246
250301	99357
260301	101036
270301	99534
280301	98459
290301	98695
300301	98619

Check http://www.employees.org/~tbates/cidr.plot.html for a plot
of the table history.


Possible Bogus Routes
---------------------

*** Bogus 91.16.23.0/24 from AS11770

AS Summary
----------

Number of ASes in routing system:                10372

Number of ASes announcing only one prefix:        6079 (3458 cidr, 2621 classful)

Largest number of  cidr routes:                    923 announced by  AS701
Largest number of classful routes:                1608 announced by AS1221



1) Gains by aggregating at the origin AS level

 --- 30Mar01 ---
ASnum    NetsNow NetsCIDR  NetGain  % Gain   Description

AS1221      1608     1207      401   24.9%   Telstra Pty Ltd
AS701       1451     1278      173   11.9%   UUNET Technologies, Inc. 
AS9269       162       53      109   67.3%   City Telecom (H.K.) Ltd.
AS4151       260      157      103   39.6%   USDA 
AS6595       163       62      101   62.0%   DoD Education Activity Network As
AS705        343      245       98   28.6%   UUNET Technologies, Inc. 
AS4293       371      278       93   25.1%   Cable & Wireless USA 
AS8013       327      242       85   26.0%   PSINet Ltd. Canada 
AS7018       672      590       82   12.2%   AT&T 
AS4755       207      131       76   36.7%   Videsh Sanchar Nigam Ltd. Autonom
AS13999       88       17       71   80.7%   Mega Cable S.A. de C.V. 
AS577        240      171       69   28.7%   Bell Advanced Communications Inc.
AS5106       101       37       64   63.4%   Ameritech Advanced Data Services,
AS3464       153       91       62   40.5%   Alabama SuperComputer Network 
AS3749       120       61       59   49.2%   Tennessee Board of Regents 
AS9498        74       17       57   77.0%   BHARTI BT INTERNET LTD.
AS16758       63        6       57   90.5%   IKON Office Solutions 
AS6413        67       11       56   83.6%   Southern Online Systems, Inc. 
AS376        134       78       56   41.8%   Reseau Interordinateurs Scientiqu
AS226        149       93       56   37.6%   Los Nettos 
AS11170       60        4       56   93.3%   Bewell Net 
AS7568        84       29       55   65.5%   C.S. Communications Co., Ltd.
AS724        194      139       55   28.4%   DLA Systems Automation Center 
AS4323       233      178       55   23.6%   Time Warner Communications, Inc. 
AS1          608      554       54    8.9%   BBN Planet 
AS6471        98       45       53   54.1%   ENTEL CHILE S.A. 
AS11252       89       36       53   59.6%   ISU Computer Center Bldg. 5 
AS7046       303      251       52   17.2%   UUNET Technologies, Inc. 
AS174        445      393       52   11.7%   PSINet Inc. 
AS1237       107       58       49   45.8%   System Engineering Research Insti


For the rest of the previous weeks gain information please see
http://www.employees.org:80/~tbates/cidr-report.html

2) Weekly Delta

Please see
http://www.employees.org:80/~tbates/cidr-report.html
for this part of the report

3) Interesting aggregates

Please see
http://www.employees.org:80/~tbates/cidr-report.html
for this part of the report





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