The Cidr Report

Tony Bates tbates at cisco.com
Fri Apr 30 19:00:02 UTC 1999



This is an auto-generated mail on Fri Apr 30 12:00:00 PDT 1999
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      A summary of the last weeks changes in terms of withdrawn and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 30Apr99


0) General Status

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

Date	Prefixes
230499	58766
240499	58380
250499	58344
260499	58454
270499	58458
280499	58561
290499	58602
300499	58568

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


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

*** Bogus 71.0.2.0/24 from AS1239
*** Bogus 221.43.160.0/19 from AS12323

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

Number of ASes in routing system:                 4878

Number of ASes announcing only one prefix:        2461 (1329 cidr, 1132 classful)

Largest number of  cidr routes:                    376 announced by  AS701
Largest number of classful routes:                 799 announced by  AS701



1) Gains by aggregating at the origin AS level

 --- 30Apr99 ---
ASnum    NetsNow NetsCIDR  NetGain  % Gain   Description

AS271        360      148      212   58.9%   BCnet Backbone
AS577        292      182      110   37.7%   Bell Canada Backbone
AS4293       289      182      107   37.0%   IMCI
AS174        603      502      101   16.7%   Performance Systems International
AS4755       175       87       88   50.3%   Videsh Sanchar Nigam Ltd. India
AS2493       211      126       85   40.3%   iSTAR Internet, Inc.
AS4200       167       94       73   43.7%   AGIS (Apex Global Information Ser
AS3749       136       63       73   53.7%   TECNET
AS7657       193      121       72   37.3%   The Internet Group Limited
AS1267        94       24       70   74.5%   IUNET-AS
AS7496        98       29       69   70.4%   Power Up
AS1239       550      485       65   11.8%   SprintLink Backbone
AS7545       111       47       64   57.7%   TPG Internet Pty Ltd
AS1785       384      321       63   16.4%   NYSERNet Backbone
AS7046       264      202       62   23.5%   UUNET-CUSTOMER
AS10928      112       50       62   55.4%   UNKNOWN
AS1221       451      392       59   13.1%   AARNET-AS
AS4740       329      272       57   17.3%   Ozemail Pty Ltd (ASN-OZEMAIL)
AS9269        66       10       56   84.8%   Hong Kong CTI
AS3493       238      184       54   22.7%   INTERLINK
AS719        474      421       53   11.2%   LANLINK autonomous system
AS72          93       41       52   55.9%   Schlumberger Information Network
AS803         79       35       44   55.7%   SaskNet Backbone
AS5674        80       36       44   55.0%   PBI-NET-BLK
AS3737       109       71       38   34.9%   PenTeleData Inc. (ASN-PTD)
AS1          499      465       34    6.8%   BBNPLANET
AS7122       110       78       32   29.1%   MTS ADVANCED Network Policy
AS4307        32        1       31   96.9%   SVINET-1
AS2907       209      178       31   14.8%   SINET
AS11515       32        1       31   96.9%   UNKNOWN


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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