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December 1997

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The Cidr Report
by Tony Bates 26 Dec '97

26 Dec '97

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is possible even larger reduction should be possible. 2) Weekly Delta A summary of the last weeks changes in terms of withdrawn and added routes.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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how to distinguish european routes from others
by Mart Norman 22 Dec '97

22 Dec '97

Hi! I'm not sure is this the right list for this question but what is the easiest way to distinguish european routes from others? Is anywhere a list of European AS-s? The reason I need this is that in nearest future we will have SAT channel to US and I would like to direct US traffic via SAT and European traffic via other channel. So I probably need to have as much as possible European routes in my box and point default to US. The problem is which nets are European and which are not. Thanks in advance, Mart =========================================================================== Mart Norman Technical Manager Esdata Ltd. Tel. +372 6 300 042 Akadeemia tee 21 GSM: +372 5 079 595 EE0026 Tallinn Fax +372 6 300 020 ESTONIA E-mail: mart(a)estnet.ee

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