The Cidr Report

Tony Bates tbates at cisco.com
Sat May 26 06:00:05 UTC 2001


This is an auto-generated mail on Fri May 25 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      A summary of the last weeks changes in terms of withdrawn and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 25May01


0) General Status

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

Date	Prefixes
040501	104512
050501	104646
060501	104816
070501	106340
080501	105979
230501	101875
240501	101755
250501	101869

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


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

*** Bogus 80.9.0.0/18 from AS3215
*** Bogus 80.9.128.0/18 from AS3215
*** Bogus 80.64.0.0/20 from AS3246
*** Bogus 80.64.128.0/20 from AS20751
*** Bogus 80.64.224.0/20 from AS3259
*** Bogus 80.65.128.0/20 from AS9057
*** Bogus 80.65.224.0/20 from AS13193
*** Bogus 80.66.32.0/20 from AS702
*** Bogus 80.66.128.0/20 from AS1239
*** Bogus 80.67.0.0/20 from AS20750
*** Bogus 80.67.32.0/20 from AS20752
*** Bogus 218.2.0.0/15 from AS4134
*** Bogus 218.4.0.0/16 from AS4134
*** Bogus 218.6.128.0/17 from AS4134

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

Number of ASes in routing system:                10851

Number of ASes announcing only one prefix:        6431 (3657 cidr, 2774 classful)

Largest number of  cidr routes:                    975 announced by  AS701
Largest number of classful routes:                1409 announced by  AS701



1) Gains by aggregating at the origin AS level

 --- 25May01 ---
ASnum    NetsNow NetsCIDR  NetGain  % Gain   Description

AS1221      1391     1031      360   25.9%   TELSTRA-AS
AS13999      103       11       92   89.3%   autonomous system number assigned
AS11252       91       33       58   63.7%   autonomous system number assigned
AS226        150       93       57   38.0%   Los Nettos
AS16758       63        6       57   90.5%   autonomous system number assigned
AS2149       320      265       55   17.2%   PSINET-2
AS1          592      539       53    9.0%   GTE Internetworking
AS11686      143       91       52   36.4%   Education Networks of America
AS10692       66       14       52   78.8%   DLS Internet Services AS10692
AS17561      111       60       51   45.9%   UNKNOWN
AS13544       69       22       47   68.1%   autonomous system number assigned
AS11774       74       28       46   62.2%   AS 11774 Object
AS1267        67       25       42   62.7%   Infostrada S.p.A.
AS1237        94       52       42   44.7%   KISTI
AS1239       441      400       41    9.3%   SprintLink Backbone
AS12235       48        7       41   85.4%   Cove Software Systems Inc
AS2652       113       75       38   33.6%   Government of Canada (GENet) back
AS209        263      226       37   14.1%   Qwest Communications
AS19834       49       12       37   75.5%   autonomous system number assigned
AS18447       46        9       37   80.4%   autonomous system number assigned
AS13345       67       30       37   55.2%   autonomous system number assigned
AS14          51       15       36   70.6%   Columbia University in the City o
AS12302       63       28       35   55.6%   MobiFon S.A.
AS2007       153      119       34   22.2%   Infonet Services Corporation
AS11507       87       53       34   39.1%   TouchAmerica Montana
AS10620       52       18       34   65.4%   autonomous system number assigned
AS11311       42        9       33   78.6%   autonomous system number assigned
AS10479       40        7       33   82.5%   ITESM-Rectoria Zona Norte
AS1913       115       83       32   27.8%   autonomous system number assigned
AS11859       45       13       32   71.1%   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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