The Cidr Report

[Tony Bates <tbates () cisco com>]

This is an auto-generated mail on Fri Jan 19 12:00:00 PST 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      A summary of the last weeks changes in terms of withdrawn and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.



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                        CIDR REPORT for 19Jan01


0) General Status

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

Date    Prefixes
120101  96318
130101  96282
140101  96187
150101  96311
160101  96451
170101  96505
180101  97424
190101  95598

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


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

*** Bogus 91.16.23.0/24 from AS11770

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

Number of ASes in routing system:                 9674

Number of ASes announcing only one prefix:        5638 (3180 cidr, 2458 classful)

Largest number of  cidr routes:                    982 announced by  AS701
Largest number of classful routes:                1618 announced by  AS701



1) Gains by aggregating at the origin AS level

 --- 19Jan01 ---
ASnum    NetsNow NetsCIDR  NetGain  % Gain   Description



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