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The Cidr Report

  • From: Tony Bates
  • Date: Fri Feb 02 15:08:51 2001

This is an auto-generated mail on Fri Feb  2 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 

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      A summary of the last weeks changes in terms of withdrawn and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 for giving me access to their routing tables once a

Please send any comments about this report directly to me.

Check for a daily
update of this report.


                        CIDR REPORT for 02Feb01

0) General Status

Table History

Date	Prefixes
260101	96902
270101	96353
280101	96304
290101	96277
300101	96520
310101	96571
010201	96527
020201	96787

Check for a plot
of the table history.

Possible Bogus Routes

*** Bogus from AS11770

AS Summary

Number of ASes in routing system:                 9790

Number of ASes announcing only one prefix:        5718 (3222 cidr, 2496 classful)

Largest number of  cidr routes:                    957 announced by  AS701
Largest number of classful routes:                1658 announced by  AS701

1) Gains by aggregating at the origin AS level

 --- 02Feb01 ---
ASnum    NetsNow NetsCIDR  NetGain  % Gain   Description

For the rest of the previous weeks gain information please see
2) Weekly Delta

Please see
for this part of the report
3) Interesting aggregates

Please see
for this part of the report

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