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The Cidr Report

  • From: Tony Bates
  • Date: Fri Feb 20 15:29:08 1998

This is an auto-generated mail on Fri Feb 20 12:00:00 PST 1998
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      A summary of the last weeks changes in terms of withdrawn and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 20Feb98


0) General Status

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

Date	Prefixes
050298	49484
140298	49400
150298	49226
160298	49509
170298	49589
180298	49307
190298	49418
200298	49181

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


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


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

Number of ASes in routing system:                 3244

Number of ASes announcing only one prefix:        1560 (801 cidr, 759 classful)

Largest number of  cidr routes:                    441 announced by AS3561
Largest number of classful routes:                1074 announced by  AS701



1) Gains by aggregating at the origin AS level

 --- 20Feb98 ---
ASnum    NetsNow NetsCIDR  NetGain  % Gain   Description

AS2493       707      435      272   38.5%   iSTAR Internet, Inc.
AS6235       525      261      264   50.3%   Intermedia Communications, Inc.
AS4293       434      210      224   51.6%   IMCI
AS816        585      420      165   28.2%   UUNET Canada (ASN-UUNETCA-AS4)
AS3602       458      305      153   33.4%   Sprint Canada Inc.
AS174        775      627      148   19.1%   Performance Systems International
AS3749       198       55      143   72.2%   TECNET
AS701       1074      950      124   11.5%   Alternet
AS3751       125       48       77   61.6%   SNET-AS
AS5668       109       37       72   66.1%   Century Telephone Inc.
AS3804       204      142       62   30.4%   WORLDLINX
AS1239       590      528       62   10.5%   SprintLink Backbone
AS3221        92       32       60   65.2%   EENet Autonomous System
AS271        112       56       56   50.0%   BCNET-AS
AS3464       121       66       55   45.5%   Alabama Research and Education Ne
AS72          84       36       48   57.1%   Schlumberger Information Network
AS1221       263      215       48   18.3%   AARNET-AS
AS549        205      158       47   22.9%   ONET-AS
AS4755        78       34       44   56.4%   Videsh Sanchar Nigam Ltd. India
AS2711        98       55       43   43.9%   SUNBELT-AS
AS7046       131       89       42   32.1%   UUNET-CUSTOMER
AS3561       883      842       41    4.6%   MCI
AS852        157      117       40   25.5%   CANET-ASN
AS684         86       46       40   46.5%   MBNET-AS
AS6335        63       23       40   63.5%   NTRNET
AS4740       348      308       40   11.5%   ASN-OZEMAIL (Ozemail Pty Ltd)
AS1          789      749       40    5.1%   BBNPLANET
AS6181        63       24       39   61.9%   FUSE-NET
AS3493       166      128       38   22.9%   INTERLINK
AS719        432      395       37    8.6%   LANLINK autonomous system


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