This is an auto-generated mail on Sun Feb 11 20:37:22 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is possible even larger reduction should be possible. 2) Weekly Delta A summary of the last weeks changes in terms of withdrawn and added routes.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. ------------------------------------------------------------------------------ CIDR REPORT for 11Feb01 0) General Status Table History ------------- Date Prefixes 040201 96815 050201 96681 060201 96726 070201 96978 080201 97041 090201 97137 100201 96880 110201 96509 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 *** Bogus 103.22.7.0/24 from AS9768 AS Summary ---------- Number of ASes in routing system: 9849 Number of ASes announcing only one prefix: 5760 (3266 cidr, 2494 classful) Largest number of cidr routes: 957 announced by AS701 Largest number of classful routes: 1642 announced by AS701 1) Gains by aggregating at the origin AS level --- 11Feb01 --- ASnum NetsNow NetsCIDR NetGain % Gain Description AS1221 1623 1207 416 25.6% Telstra Pty Ltd AS701 1642 1451 191 11.6% UUNET Technologies, Inc. AS271 280 132 148 52.9% University of British Columbia AS7545 196 71 125 63.8% ASNBLK-APNIC-AS-2-BLOCK AS9269 162 46 116 71.6% ASNBLK-APNIC-AS-3-BLOCK AS6429 221 108 113 51.1% RdC Internet AS6595 163 62 101 62.0% DoD Education Activity Network As AS8013 434 336 98 22.6% PSINet Ltd. Canada AS13999 107 10 97 90.7% Mega Cable S.A. de C.V. AS4293 374 281 93 24.9% Cable & Wireless USA AS7496 104 23 81 77.9% ASNBLK-APNIC-AS-2-BLOCK AS4151 250 169 81 32.4% USDA AS705 312 234 78 25.0% UUNET Technologies, Inc. AS4755 209 137 72 34.4% Videsh Sanchar Nigam Ltd. Autonom AS1942 137 65 72 52.6% FR-CICG-GRENOBLE AS7018 615 544 71 11.5% AT&T AS7046 325 255 70 21.5% UUNET Technologies, Inc. AS577 236 167 69 29.2% Bell Advanced Communications Inc. AS174 499 431 68 13.6% PSINet Inc. AS1727 162 94 68 42.0% Commander Naval Surface force US AS9498 88 21 67 76.1% BHARTI BT INTERNET LTD. AS724 219 152 67 30.6% DLA Systems Automation Center AS5106 101 37 64 63.4% Ameritech Advanced Data Services, AS3464 153 92 61 39.9% Alabama SuperComputer Network AS7657 185 125 60 32.4% ASNBLK-APNIC-AS-2-BLOCK AS226 155 95 60 38.7% Los Nettos AS3749 115 57 58 50.4% Tennessee Board of Regents AS16758 63 6 57 90.5% IKON Office Solutions AS6413 67 11 56 83.6% Southern Online Systems, Inc. AS376 131 75 56 42.7% Reseau Interordinateurs Scientiqu 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
So after a while of not working properly, the cidr-report should now be fixed. In fact it has been working but because it is taking almost a day to generate the data mainly because of all the whois lookups the report has been misleading in that it looked like the info wasn't there where in fact it was from the day before. A few things I want to point out about the report. 1) It is not as useful as it used to be (even when it is working ;-)). Why ? Firstly, when I started the report (6 or 7 years ago) I made a simple assumption that when ISPs advertised classles (as opposed to traditional classful A,B or C) routes there was a need for it as they had to go out of their way to configure it so essentially I ignored these routes in the AS aggregation calculations. Today, this does not hold true anywhere as much as it used to. Secondly, it always makes the assumption that you can aggregate at the source AS level which for some providers is clearly not true for all routes. I need to look at changing the above assumptions in future reports to see what this does to potential savings. I expect it could be quite high. Even today with the simple assumptions above it appears to be a gain of 11,000 routes for just 54,000 classful routes advertised. 2) It seems folks don't use it as much as they can as I see very little positive changes anymore. However, having said this I would like to understand from folks (reply directly) if you think I should continue to generate this. Note also that in interesting aggregates section (see web page) this is also not as interesting (as it uses the same assumption above) as it used to be. However, it is worth having a quick look for config errors and would encourage providers to do this periodically. --Tony At 08:37 PM 2/11/2001 -0800, Tony Bates wrote:
This is an auto-generated mail on Sun Feb 11 20:37:22 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.
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1) Gains by aggregating at the origin AS level
--- 11Feb01 --- ASnum NetsNow NetsCIDR NetGain % Gain Description
AS1221 1623 1207 416 25.6% Telstra Pty Ltd AS701 1642 1451 191 11.6% UUNET Technologies, Inc. AS271 280 132 148 52.9% University of British Columbia AS7545 196 71 125 63.8% ASNBLK-APNIC-AS-2-BLOCK AS9269 162 46 116 71.6% ASNBLK-APNIC-AS-3-BLOCK AS6429 221 108 113 51.1% RdC Internet AS6595 163 62 101 62.0% DoD Education Activity Network As AS8013 434 336 98 22.6% PSINet Ltd. Canada AS13999 107 10 97 90.7% Mega Cable S.A. de C.V. AS4293 374 281 93 24.9% Cable & Wireless USA AS7496 104 23 81 77.9% ASNBLK-APNIC-AS-2-BLOCK AS4151 250 169 81 32.4% USDA AS705 312 234 78 25.0% UUNET Technologies, Inc. AS4755 209 137 72 34.4% Videsh Sanchar Nigam Ltd. Autonom AS1942 137 65 72 52.6% FR-CICG-GRENOBLE AS7018 615 544 71 11.5% AT&T AS7046 325 255 70 21.5% UUNET Technologies, Inc. AS577 236 167 69 29.2% Bell Advanced Communications Inc. AS174 499 431 68 13.6% PSINet Inc. AS1727 162 94 68 42.0% Commander Naval Surface force US AS9498 88 21 67 76.1% BHARTI BT INTERNET LTD. AS724 219 152 67 30.6% DLA Systems Automation Center AS5106 101 37 64 63.4% Ameritech Advanced Data Services, AS3464 153 92 61 39.9% Alabama SuperComputer Network AS7657 185 125 60 32.4% ASNBLK-APNIC-AS-2-BLOCK AS226 155 95 60 38.7% Los Nettos AS3749 115 57 58 50.4% Tennessee Board of Regents AS16758 63 6 57 90.5% IKON Office Solutions AS6413 67 11 56 83.6% Southern Online Systems, Inc. AS376 131 75 56 42.7% Reseau Interordinateurs Scientiqu
participants (1)
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Tony Bates