The Cidr Report
Tony Bates
tbates at cisco.com
Fri Dec 26 20:00:01 UTC 1997
This is an auto-generated mail on Fri Dec 26 12:00:00 PST 1997
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A summary of the last weeks changes in terms of withdrawn and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 26Dec97
0) General Status
Table History
-------------
Date Prefixes
191297 46949
201297 46969
211297 46910
221297 46996
231297 47516
241297 47566
251297 47463
261297 47433
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: 1662
Number of ASes announcing only one prefix: 778 (143 cidr, 635 classful)
Largest number of cidr routes: 121 announced by AS3561
Largest number of classful routes: 583 announced by AS1
1) Gains by aggregating at the origin AS level
--- 26Dec97 ---
ASnum NetsNow NetsCIDR NetGain % Gain Description
AS4293 201 102 99 49.3% IMCI
AS72 84 36 48 57.1% Schlumberger Information Network
AS719 505 460 45 8.9% LANLINK autonomous system
AS174 298 258 40 13.4% Performance Systems International
AS271 80 46 34 42.5% BCnet Backbone
AS1 583 551 32 5.5% BBNPLANET
AS1257 296 265 31 10.5% SWIPnet Swedish IP Network
AS701 473 443 30 6.3% Alternet
AS2493 97 73 24 24.7% iSTAR Internet, Inc.
AS5381 58 36 22 37.9% PowerTech Information Systems AS
AS8517 75 55 20 26.7% ULAKNET-ASN
AS6822 37 19 18 48.6% SuperOnline autonomous system
AS6663 35 17 18 51.4% InterComp Bucharest
AS3663 25 7 18 72.0% NETNET-NET
AS3563 59 41 18 30.5% Pilot Network Services, Inc.
AS2048 45 28 17 37.8% LaNet
AS2561 36 20 16 44.4% Egyptian Networks
AS6897 32 17 15 46.9% Global-One Spain
AS3564 29 15 14 48.3% Microserve Infromation Systems In
AS2907 110 96 14 12.7% SINET
AS1239 268 254 14 5.2% SprintLink Backbone
AS6846 30 17 13 43.3% UKRPACK.NET
AS1785 162 149 13 8.0% NYSERNet Backbone
AS5666 35 23 12 34.3% Omnes - A Schlumberger and Cable
AS4000 74 62 12 16.2% Global IP
AS2752 38 26 12 31.6% THOMSONCA-AS
AS549 93 82 11 11.8% ONet Backbone
AS3577 30 19 11 36.7% PREPnet-WEST
AS2686 46 35 11 23.9% Autonomous System number for IBM
AS816 54 44 10 18.5% UUNET Canada (ASN-UUNETCA-AS4)
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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