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The Cidr Report
From: Tony Bates <tbates () cisco com>
Date: Fri, 04 May 2001 23:00:02 -0700



This is an auto-generated mail on Fri May  4 23:00:00 PDT 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      A summary of the last weeks changes in terms of withdrawn and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 04May01


0) General Status

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

Date    Prefixes
270401  100797
280401  102051
290401  102329
300401  102763
010501  103252
020501  104027
030501  104798
040501  104512

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


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

*** Bogus 218.6.128.0/17 from AS4134

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

Number of ASes in routing system:                10668

Number of ASes announcing only one prefix:        6344 (3599 cidr, 2745 classful)

Largest number of  cidr routes:                   2588 announced by AS2149
Largest number of classful routes:                1404 announced by  AS701



1) Gains by aggregating at the origin AS level

 --- 04May01 ---
ASnum    NetsNow NetsCIDR  NetGain  % Gain   Description

AS1221      1396     1034      362   25.9%   TELSTRA-AS
AS701       1404     1217      187   13.3%   Alternet
AS2149       613      452      161   26.3%   PSINET-2
AS705        380      250      130   34.2%   part of AS assignment AS701 - AS7
AS4151       258      146      112   43.4%   part of AS assignment AS4151 - AS
AS4293       392      283      109   27.8%   part of AS assignment AS4287 - AS
AS6429       215      107      108   50.2%   ATT LA Internet Chile
AS6595       164       62      102   62.2%   autonomous system number assigned
AS13999      104        8       96   92.3%   autonomous system number assigned
AS4755       235      145       90   38.3%   part of AS assignment AS4608 - AS
AS8013       343      258       85   24.8%   autonomous system number assigned
AS7018       701      617       84   12.0%   AT&T WorldNet Service Backbone
AS577        236      167       69   29.2%   autonomous system number assigned
AS174        427      361       66   15.5%   Performance Systems International
AS6471       113       49       64   56.6%   autonomous system number assigned
AS5106       100       37       63   63.0%   autonomous system number assigned
AS3464       153       91       62   40.5%   Alabama Research and Education Ne
AS3749       119       58       61   51.3%   autonomous system number assigned
AS3602       254      195       59   23.2%   Sprint Canada Inc.
AS724        205      147       58   28.3%   part of AS assignment AS721 - AS7
AS11252       91       33       58   63.7%   autonomous system number assigned
AS1          609      551       58    9.5%   GTE Internetworking
AS16758       63        6       57   90.5%   autonomous system number assigned
AS6413        67       11       56   83.6%   autonomous system number assigned
AS226        149       93       56   37.6%   Los Nettos
AS4323       232      179       53   22.8%   Time Warner Telecom Internet
AS17561      110       59       51   46.4%   UNKNOWN
AS852        206      157       49   23.8%   autonomous system number assigned
AS8151       183      137       46   25.1%   autonomous system number assigned
AS13544       68       22       46   67.6%   autonomous system number assigned


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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