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Analyzing The Cidr Report (fwd)

  • From: Lee Howard
  • Date: Mon Dec 23 12:43:50 2002


I've agreed to analyze the CIDR Report, to understand why people don't
aggregate more/better, as suggested below.  I'll look into AS701, and
(time and security permitting) any other UUNET ASN.  I do expect to make 
my findings public, at least in summary form.

Whatever I find will be more useful if other operators do the same, so
we can present an overall analysis of many of the top "offenders" of
poor aggregation.  At first glance, it looks like it may not require
too much time, but I would like to agree on a methodology and a final
report format.  So if anyone from any of the operators listed below 
would like to work jointly, reply privately and we'll work out the
details.

--
Lee Howard	Lee.Howard@wcom.com  (703) 886-5231
Sr. Manager 	Internet Installations, 
WorldCom	IP Policy and Allocations


---------- Forwarded message ----------
Date: Fri, 13 Dec 2002 22:00:00 +1100 (EST)
From: cidr-report@potaroo.net
To: cidr-report@potaroo.net
Cc: nanog@merit.edu, eof-list@ripe.net, apops@lists.apnic.net,
     routing-wg@ripe.net, afnog@afnog.org
Subject: [apops] The Cidr Report


This report has been generated at Fri Dec 13 21:45:30 2002 AEST.
The report analyses the BGP Routing Table of an AS4637 (Reach) router
and generates a report on aggregation potential within the table.

Check http://www.cidr-report.org/as4637 for a current version of this report.

Recent Table History
        Date      Prefixes    CIDR Agg
        06-12-02    116870       84511
        07-12-02    116855       84559
        08-12-02    116930       84442
        09-12-02    116755       84596
        10-12-02    116879       84724
        11-12-02    117039       84740
        12-12-02    117133       84733
        13-12-02    116860       84827


AS Summary
         14178  Number of ASes in routing system
          5599  Number of ASes announcing only one prefix
          1805  Largest number of prefixes announced by an AS
                AS3908 : SUPERNETASBLK SuperNet, Inc.
      72982528  Largest address span announced by an AS (/32s)
                AS568  : SUMNET-AS DISO-UNRRA


Aggregation Summary
The algorithm used in this report proposes aggregation only
when there is a precise match using the AS path, so as 
to preserve traffic transit policies. Aggregation is also
proposed across non-advertised address space ('holes').

 --- 13Dec02 ---
ASnum    NetsNow NetsAggr  NetGain   % Gain   Description

Table     116935    84790    32145    27.5%   All ASes

AS3908      1805     1063      742    41.1%   SUPERNETASBLK SuperNet, Inc.
AS701       1676     1219      457    27.3%   ALTERNET-AS UUNET
                                               Technologies, Inc.
AS18566      419        5      414    98.8%   COVAD Covad Communications
AS7018      1389     1014      375    27.0%   ATT-INTERNET4 AT&T WorldNet
                                               Services
AS4323       524      185      339    64.7%   TW-COMM Time Warner
                                               Communications, Inc.
AS1221      1162      843      319    27.5%   ASN-TELSTRA Telstra Pty Ltd
AS6197       456      141      315    69.1%   BATI-ATL BellSouth Network
                                               Solutions, Inc
AS7843       596      295      301    50.5%   ADELPHIA-AS Adelphia Corp.
AS4355       405      136      269    66.4%   ERMS-EARTHLNK EARTHLINK, INC
AS6347       352       85      267    75.9%   DIAMOND SAVVIS Communications
                                               Corporation
AS7046       586      319      267    45.6%   UUNET-CUSTOMER UUNET
                                               Technologies, Inc.
AS22927      289       22      267    92.4%   AR-TEAR2-LACNIC TELEFONICA DE
                                               ARGENTINA
AS1239       935      670      265    28.3%   SPRINTLINK Sprint
AS705        434      195      239    55.1%   ASN-ALTERNET UUNET
                                               Technologies, Inc.
AS4814       249       15      234    94.0%   CHINANET-BEIJING-AP China
                                               Telecom (Group)
AS1          665      440      225    33.8%   GNTY-1 Genuity
AS6198       420      201      219    52.1%   BATI-MIA BellSouth Network
                                               Solutions, Inc
AS17676      232       28      204    87.9%   GIGAINFRA XTAGE CORPORATION
AS690        513      319      194    37.8%   MERIT-AS-27 Merit Network Inc.
AS6140       314      121      193    61.5%   IMPSAT-USA ImpSat
AS4151       326      135      191    58.6%   USDA-1 USDA
AS4134       292      108      184    63.0%   ERX-CHINALINK Data
                                               Communications Bureau
AS209        519      339      180    34.7%   ASN-QWEST Qwest
AS852        625      445      180    28.8%   ASN852 Telus Advanced
                                               Communications
AS2048       260       88      172    66.2%   LANET-1 State of Louisiana
AS6327       183       34      149    81.4%   SHAWFIBER Shaw Fiberlink
                                               Limited
AS2386       377      232      145    38.5%   INS-AS AT&T Data
                                               Communications Services
AS17557      314      173      141    44.9%   PKTELECOM-AS-AP Pakistan
                                               Telecom
AS3215       308      170      138    44.8%   AS3215  France Telecom
                                               Transpac
AS702        807      670      137    17.0%   AS702  UUNET - Commercial IP
                                               service provider in Europe

Total      17432     9710     7722    44.3%   Top 30 total



Please see http://www.cidr-report.org for the full report

------------------------------------
Copies of this report are mailed to:
  nanog@merit.edu
  eof-list@ripe.net
  apops@lists.apnic.net
  routing-wg@ripe.net
  afnog@afnog.org
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