The Cidr Report

Tony Bates tbates at cisco.com
Fri Apr 23 19:00:02 UTC 1999


This is an auto-generated mail on Fri Apr 23 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      A summary of the last weeks changes in terms of withdrawn and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 23Apr99


0) General Status

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

Date	Prefixes
160499	58374
170499	58360
180499	58291
190499	58530
200499	58544
210499	58520
220499	58449
230499	58766

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:                 4930

Number of ASes announcing only one prefix:        2503 (1317 cidr, 1186 classful)

Largest number of  cidr routes:                    375 announced by  AS701
Largest number of classful routes:                 801 announced by  AS701



1) Gains by aggregating at the origin AS level

 --- 23Apr99 ---
ASnum    NetsNow NetsCIDR  NetGain  % Gain   Description

AS271        360      148      212   58.9%   BCnet Backbone
AS577        291      181      110   37.8%   Bell Canada Backbone
AS4293       291      184      107   36.8%   IMCI
AS174        615      509      106   17.2%   Performance Systems International
AS4755       167       78       89   53.3%   Videsh Sanchar Nigam Ltd. India
AS2493       216      129       87   40.3%   iSTAR Internet, Inc.
AS3749       143       63       80   55.9%   TECNET
AS4200       175      100       75   42.9%   AGIS (Apex Global Information Ser
AS721        141       68       73   51.8%   DLA-ASNBLOCK-AS
AS1267        94       24       70   74.5%   IUNET-AS
AS7657       191      124       67   35.1%   The Internet Group Limited
AS7496        97       31       66   68.0%   Power Up
AS7545       110       46       64   58.2%   TPG Internet Pty Ltd
AS7046       261      198       63   24.1%   UUNET-CUSTOMER
AS1785       385      322       63   16.4%   NYSERNet Backbone
AS1221       449      387       62   13.8%   AARNET-AS
AS1239       527      467       60   11.4%   SprintLink Backbone
AS4740       331      274       57   17.2%   Ozemail Pty Ltd (ASN-OZEMAIL)
AS10928      110       53       57   51.8%   UNKNOWN
AS3493       238      184       54   22.7%   INTERLINK
AS719        470      417       53   11.3%   LANLINK autonomous system
AS72          92       40       52   56.5%   Schlumberger Information Network
AS803         79       35       44   55.7%   SaskNet Backbone
AS5674        80       36       44   55.0%   PBI-NET-BLK
AS3737       110       70       40   36.4%   PenTeleData Inc. (ASN-PTD)
AS1          508      473       35    6.9%   BBNPLANET
AS7122       109       77       32   29.4%   MTS ADVANCED Network Policy
AS9269        52       21       31   59.6%   Hong Kong CTI
AS4307        32        1       31   96.9%   SVINET-1
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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