The Cidr Report

Sat Apr 21 06:00:04 UTC 2001

This is an auto-generated mail on Fri Apr 20 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      A summary of the last weeks changes in terms of withdrawn and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 20Apr01

0) General Status

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

Date	Prefixes
130401	99823
140401	99656
150401	99795
160401	99731
170401	99601
180401	99779
190401	99884
200401	100216

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

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

*** Bogus 223.255.46.0 from AS6853
*** Bogus 223.255.70.0 from AS6853

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

Number of ASes in routing system:                10519

Number of ASes announcing only one prefix:        6219 (3531 cidr, 2688 classful)

Largest number of  cidr routes:                   1218 announced by  AS705
Largest number of classful routes:                1592 announced by AS1221

1) Gains by aggregating at the origin AS level

 --- 20Apr01 ---
ASnum    NetsNow NetsCIDR  NetGain  % Gain   Description

AS1221      1592     1194      398   25.0%   Telstra Pty Ltd
AS701       1462     1276      186   12.7%   1
AS705        368      251      117   31.8%   1
AS6429       214      105      109   50.9%   1
AS4151       247      139      108   43.7%   1
AS6595       163       62      101   62.0%   1
AS13999      104        8       96   92.3%   1
AS4293       370      277       93   25.1%   1
AS7018       694      605       89   12.8%   1
AS15412      430      341       89   20.7%   FLAG Telecom Global Internet AS
AS8013       319      236       83   26.0%   1
AS4755       218      138       80   36.7%   Videsh Sanchar Nigam Ltd. Autonom
AS577        241      172       69   28.6%   1
AS5106       101       37       64   63.4%   1
AS3749       120       59       61   50.8%   1
AS9498        75       15       60   80.0%   BHARTI BT INTERNET LTD.
AS3464       151       92       59   39.1%   1
AS11252       92       34       58   63.0%   1
AS724        203      146       57   28.1%   1
AS16758       63        6       57   90.5%   1
AS1          609      552       57    9.4%   1
AS6413        67       11       56   83.6%   1
AS226        149       93       56   37.6%   1
AS7568        84       29       55   65.5%   C.S. Communications Co., Ltd.
AS6471        99       46       53   53.5%   1
AS4323       230      178       52   22.6%   1
AS9269       116       67       49   42.2%   City Telecom (H.K.) Ltd.
AS852        200      152       48   24.0%   1
AS10692       62       14       48   77.4%   1
AS9683        48        2       46   95.8%   Kyonggi Cable TV

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