Weekly Routing Table Report

Zartash Uzmi zartash at gmail.com
Sun Aug 2 18:29:28 CDT 2009


Apologies if this is too naive to ask but is there some detail available
about the items listed in the summary?

1) In particular, what exactly is the difference between the "BGP routing
table entries examined (292961)" and "Unique aggregates announced to
Internet (145391)"?

2) I believe 292961 is the worst case routing table size for any router. If
the unique aggregates announced to the Internet is 145391, how does the
routing table size anywhere may exceeds this number? Is the word "Internet"
the key here?

3) Is aggregation done at a particular router for (i) reducing the table
size in that router, or (ii) reducing the number of announced prefixes by
that router, or (iii) both?

Zartash

On Fri, Jul 31, 2009 at 11:12 PM, Routing Analysis Role Account <
cscora at apnic.net> wrote:

> This is an automated weekly mailing describing the state of the Internet
> Routing Table as seen from APNIC's router in Japan.
> Daily listings are sent to bgp-stats at lists.apnic.net
>
> For historical data, please see http://thyme.apnic.net.
>
> If you have any comments please contact Philip Smith <pfs at cisco.com>.
>
> Routing Table Report   04:00 +10GMT Sat 01 Aug, 2009
>
> Report Website:     http://thyme.apnic.net
> Detailed Analysis:  http://thyme.apnic.net/current/
>
> Analysis Summary
> ----------------
>
> BGP routing table entries examined:                              292961
>    Prefixes after maximum aggregation:                          138493
>    Deaggregation factor:                                          2.12
>    Unique aggregates announced to Internet:                     145391
> Total ASes present in the Internet Routing Table:                 31852
>    Prefixes per ASN:                                              9.20
> Origin-only ASes present in the Internet Routing Table:           27681
> Origin ASes announcing only one prefix:                           13518
> Transit ASes present in the Internet Routing Table:                4171
> Transit-only ASes present in the Internet Routing Table:            105
> Average AS path length visible in the Internet Routing Table:       3.6
>    Max AS path length visible:                                      24
>    Max AS path prepend of ASN (12026)                               22
> Prefixes from unregistered ASNs in the Routing Table:               456
>    Unregistered ASNs in the Routing Table:                         130
> Number of 32-bit ASNs allocated by the RIRs:                        220
> Prefixes from 32-bit ASNs in the Routing Table:                      81
> Special use prefixes present in the Routing Table:                    0
> Prefixes being announced from unallocated address space:            340
> Number of addresses announced to Internet:                   2082757696
>    Equivalent to 124 /8s, 36 /16s and 92 /24s
>    Percentage of available address space announced:               56.2
>    Percentage of allocated address space announced:               65.0
>    Percentage of available address space allocated:               86.4
>    Percentage of address space in use by end-sites:               78.5
> Total number of prefixes smaller than registry allocations:      140414
>
> APNIC Region Analysis Summary
> -----------------------------
>
> Prefixes being announced by APNIC Region ASes:                    70058
>    Total APNIC prefixes after maximum aggregation:               24829
>    APNIC Deaggregation factor:                                    2.82
> Prefixes being announced from the APNIC address blocks:           69476
>    Unique aggregates announced from the APNIC address blocks:    31605
> APNIC Region origin ASes present in the Internet Routing Table:    3717
>    APNIC Prefixes per ASN:                                       18.69
> APNIC Region origin ASes announcing only one prefix:               1012
> APNIC Region transit ASes present in the Internet Routing Table:    579
> Average APNIC Region AS path length visible:                        3.5
>    Max APNIC Region AS path length visible:                         16
> Number of APNIC addresses announced to Internet:              475903680
>    Equivalent to 28 /8s, 93 /16s and 182 /24s
>    Percentage of available APNIC address space announced:         88.6
>
> APNIC AS Blocks        4608-4864, 7467-7722, 9216-10239, 17408-18431
> (pre-ERX allocations)  23552-24575, 37888-38911, 45056-46079
> APNIC Address Blocks    58/8,  59/8,  60/8,  61/8, 110/8, 111/8, 112/8,
>                       113/8, 114/8, 115/8, 116/8, 117/8, 118/8, 119/8,
>                       120/8, 121/8, 122/8, 123/8, 124/8, 125/8, 126/8,
>                       180/8, 183/8, 202/8, 203/8, 210/8, 211/8, 218/8,
>                       219/8, 220/8, 221/8, 222/8,
>
> ARIN Region Analysis Summary
> ----------------------------
>
> Prefixes being announced by ARIN Region ASes:                    124431
>    Total ARIN prefixes after maximum aggregation:                66173
>    ARIN Deaggregation factor:                                     1.88
> Prefixes being announced from the ARIN address blocks:           125090
>    Unique aggregates announced from the ARIN address blocks:     52293
> ARIN Region origin ASes present in the Internet Routing Table:    13139
>    ARIN Prefixes per ASN:                                         9.52
> ARIN Region origin ASes announcing only one prefix:                5077
> ARIN Region transit ASes present in the Internet Routing Table:    1287
> Average ARIN Region AS path length visible:                         3.3
>    Max ARIN Region AS path length visible:                          24
> Number of ARIN addresses announced to Internet:              1012769216
>    Equivalent to 60 /8s, 93 /16s and 161 /24s
>    Percentage of available ARIN address space announced:          88.8
>
> ARIN AS Blocks         1-1876, 1902-2042, 2044-2046, 2048-2106
> (pre-ERX allocations)  2138-2584, 2615-2772, 2823-2829, 2880-3153
>                       3354-4607, 4865-5119, 5632-6655, 6912-7466
>                       7723-8191, 10240-12287, 13312-15359, 16384-17407
>                       18432-20479, 21504-23551, 25600-26591,
>                       26624-27647, 29696-30719, 31744-33791
>                       35840-36863, 39936-40959, 46080-47103
>                       53248-55295
> ARIN Address Blocks      3/8,   4/8,   6/8,   7/8,   8/8,   9/8,  11/8,
>                        12/8,  13/8,  15/8,  16/8,  17/8,  18/8,  19/8,
>                        20/8,  21/8,  22/8,  24/8,  26/8,  28/8,  29/8,
>                        30/8,  32/8,  33/8,  34/8,  35/8,  38/8,  40/8,
>                        44/8,  45/8,  47/8,  48/8,  52/8,  54/8,  55/8,
>                        56/8,  63/8,  64/8,  65/8,  66/8,  67/8,  68/8,
>                        69/8,  70/8,  71/8,  72/8,  73/8,  74/8,  75/8,
>                        76/8,  96/8,  97/8,  98/8,  99/8, 108/8, 173/8,
>                       174/8, 184/8, 199/8, 204/8, 205/8, 206/8, 207/8,
>                       208/8, 209/8, 214/8, 215/8, 216/8,
>
> RIPE Region Analysis Summary
> ----------------------------
>
> Prefixes being announced by RIPE Region ASes:                     67087
>    Total RIPE prefixes after maximum aggregation:                39643
>    RIPE Deaggregation factor:                                     1.69
> Prefixes being announced from the RIPE address blocks:            66684
>    Unique aggregates announced from the RIPE address blocks:     44964
> RIPE Region origin ASes present in the Internet Routing Table:    13340
>    RIPE Prefixes per ASN:                                         5.00
> RIPE Region origin ASes announcing only one prefix:                6980
> RIPE Region transit ASes present in the Internet Routing Table:    1995
> Average RIPE Region AS path length visible:                         4.0
>    Max RIPE Region AS path length visible:                          21
> Number of RIPE addresses announced to Internet:               498967744
>    Equivalent to 29 /8s, 189 /16s and 164 /24s
>    Percentage of available RIPE address space announced:          99.1
>
> RIPE AS Blocks         1877-1901, 2043, 2047, 2107-2136, 2585-2614
> (pre-ERX allocations)  2773-2822, 2830-2879, 3154-3353, 5377-5631
>                       6656-6911, 8192-9215, 12288-13311, 15360-16383
>                       20480-21503, 24576-25599, 28672-29695
>                       30720-31743, 33792-35839, 38912-39935
>                       40960-45055, 47104-52223
> RIPE Address Blocks     25/8,  51/8,  62/8,  77/8,  78/8,  79/8,  80/8,
>                        81/8,  82/8,  83/8,  84/8,  85/8,  86/8,  87/8,
>                        88/8,  89/8,  90/8,  91/8,  92/8,  93/8,  94/8,
>                        95/8, 109/8, 178/8, 193/8, 194/8, 195/8, 212/8,
>                       213/8, 217/8,
>
> LACNIC Region Analysis Summary
> ------------------------------
>
> Prefixes being announced by LACNIC Region ASes:                   24832
>    Total LACNIC prefixes after maximum aggregation:               6078
>    LACNIC Deaggregation factor:                                   4.09
> Prefixes being announced from the LACNIC address blocks:          24789
>    Unique aggregates announced from the LACNIC address blocks:   13736
> LACNIC Region origin ASes present in the Internet Routing Table:   1147
>    LACNIC Prefixes per ASN:                                      21.61
> LACNIC Region origin ASes announcing only one prefix:               367
> LACNIC Region transit ASes present in the Internet Routing Table:   192
> Average LACNIC Region AS path length visible:                       4.0
>    Max LACNIC Region AS path length visible:                        23
> Number of LACNIC addresses announced to Internet:              72874176
>    Equivalent to 4 /8s, 87 /16s and 248 /24s
>    Percentage of available LACNIC address space announced:        72.4
>
> LACNIC AS Blocks       26592-26623, 27648-28671, 52224-53247
>                       plus ERX transfers
> LACNIC Address Blocks  186/8, 187/8, 189/8, 190/8, 200/8, 201/8,
>
> AfriNIC Region Analysis Summary
> -------------------------------
>
> Prefixes being announced by AfriNIC Region ASes:                   6163
>    Total AfriNIC prefixes after maximum aggregation:              1482
>    AfriNIC Deaggregation factor:                                  4.16
> Prefixes being announced from the AfriNIC address blocks:          6569
>    Unique aggregates announced from the AfriNIC address blocks:   2514
> AfriNIC Region origin ASes present in the Internet Routing Table:   299
>    AfriNIC Prefixes per ASN:                                     21.97
> AfriNIC Region origin ASes announcing only one prefix:               82
> AfriNIC Region transit ASes present in the Internet Routing Table:   61
> Average AfriNIC Region AS path length visible:                      3.8
>    Max AfriNIC Region AS path length visible:                       16
> Number of AfriNIC addresses announced to Internet:             20273152
>    Equivalent to 1 /8s, 53 /16s and 88 /24s
>    Percentage of available AfriNIC address space announced:       60.4
>
> AfriNIC AS Blocks      36864-37887 & ERX transfers
> AfriNIC Address Blocks  41/8, 197/8,
>
> APNIC Region per AS prefix count summary
> ----------------------------------------
>
>  ASN   No of nets  /20 equiv  MaxAgg  Description
>  4766     1714       6976         419   Korea Telecom (KIX)
> 17488     1543        137         103   Hathway IP Over Cable Interne
>  4755     1227        292         145   TATA Communications formerly
>  9583     1114         87         548   Sify Limited
>  4134      980      17389         381   CHINANET-BACKBONE
>  7545      807        198         101   TPG Internet Pty Ltd
>  9829      807        619          15   BSNL National Internet Backbo
> 23577      785         34         666   Korea Telecom (ATM-MPLS)
>  4808      754       1515         172   CNCGROUP IP network: China169
> 18101      750        201          32   Reliance Infocom Ltd Internet
>
> Complete listing at http://thyme.apnic.net/current/data-ASnet-APNIC
>
> ARIN Region per AS prefix count summary
> ---------------------------------------
>
>  ASN   No of nets  /20 equiv  MaxAgg  Description
>  6389     4224       3643         323   bellsouth.net, inc.
>  4323     1912       1048         386   Time Warner Telecom
>  1785     1719        714         138   PaeTec Communications, Inc.
>  7018     1511       5907        1047   AT&T WorldNet Services
> 20115     1428       1464         679   Charter Communications
>  2386     1265        669         921   AT&T Data Communications Serv
>  6478     1249        274         302   AT&T Worldnet Services
>  3356     1201      10963         443   Level 3 Communications, LLC
> 11492     1129        208          12   Cable One
> 22773     1079       2604          66   Cox Communications, Inc.
>
> Complete listing at http://thyme.apnic.net/current/data-ASnet-ARIN
>
> RIPE Region per AS prefix count summary
> ---------------------------------------
>
>  ASN   No of nets  /20 equiv  MaxAgg  Description
> 30890      483         92         195   Evolva Telecom
> 12479      470        578           6   Uni2 Autonomous System
>  3292      460       1905         395   TDC Tele Danmark
>  702      430       1861         346   UUNET - Commercial IP service
>  9198      367        138          12   Kazakhtelecom Data Network Ad
>  3320      353       7083         306   Deutsche Telekom AG
>  3301      347       1684         310   TeliaNet Sweden
>  3215      344       3081         109   France Telecom Transpac
>  8866      335        109          20   Bulgarian Telecommunication C
>  8551      310        290          38   Bezeq International
>
> Complete listing at http://thyme.apnic.net/current/data-ASnet-RIPE
>
> LACNIC Region per AS prefix count summary
> -----------------------------------------
>
>  ASN   No of nets  /20 equiv  MaxAgg  Description
>  8151     1504       2898         245   UniNet S.A. de C.V.
> 10620      964        220         107   TVCABLE BOGOTA
> 28573      637        579          41   NET Servicos de Comunicao S.A
>  7303      601        320          94   Telecom Argentina Stet-France
> 22047      539        302          14   VTR PUNTO NET S.A.
> 11830      489        310          54   Instituto Costarricense de El
> 11172      443         99          69   Servicios Alestra S.A de C.V
>  6471      421         96          31   ENTEL CHILE S.A.
>  7738      410        858          29   Telecomunicacoes da Bahia S.A
>  3816      386        189          80   Empresa Nacional de Telecomun
>
> Complete listing at http://thyme.apnic.net/current/data-ASnet-LACNIC
>
> AfriNIC Region per AS prefix count summary
> ------------------------------------------
>
>  ASN   No of nets  /20 equiv  MaxAgg  Description
>  8452     1025        188           7   TEDATA
> 24863      908         90          48   LINKdotNET AS number
> 20858      324         34           5   EgyNet
>  3741      277        856         237   The Internet Solution
>  2018      245        215         143   Tertiary Education Network
>  6713      176        166          16   Itissalat Al-MAGHRIB
> 33783      152         10           8   EEPAD TISP TELECOM & INTERNET
> 24835      138         46           9   RAYA Telecom - Egypt
> 29571      138         14           6   Ci Telecom Autonomous system
>  5536      123          8           9   Internet Egypt Network
>
> Complete listing at http://thyme.apnic.net/current/data-ASnet-AFRINIC
>
> Global Per AS prefix count summary
> ----------------------------------
>
>  ASN   No of nets  /20 equiv  MaxAgg  Description
>  6389     4224       3643         323   bellsouth.net, inc.
>  4323     1912       1048         386   Time Warner Telecom
>  1785     1719        714         138   PaeTec Communications, Inc.
>  4766     1714       6976         419   Korea Telecom (KIX)
> 17488     1543        137         103   Hathway IP Over Cable Interne
>  7018     1511       5907        1047   AT&T WorldNet Services
>  8151     1504       2898         245   UniNet S.A. de C.V.
> 20115     1428       1464         679   Charter Communications
>  2386     1265        669         921   AT&T Data Communications Serv
>  6478     1249        274         302   AT&T Worldnet Services
>
> Complete listing at http://thyme.apnic.net/current/data-ASnet
>
> Global Per AS Maximum Aggr summary
> ----------------------------------
>
>  ASN   No of nets  Net Savings Description
>  1785      1719        1581      PaeTec Communications, Inc.
>  4323      1912        1526      Time Warner Telecom
> 17488      1543        1440      Hathway IP Over Cable Interne
>  4766      1714        1295      Korea Telecom (KIX)
>  8151      1504        1259      UniNet S.A. de C.V.
> 11492      1129        1117      Cable One
>  4755      1227        1082      TATA Communications formerly
> 18566      1062        1052      Covad Communications
>  8452      1025        1018      TEDATA
> 22773      1079        1013      Cox Communications, Inc.
>
> Complete listing at http://thyme.apnic.net/current/data-CIDRnet
>
> List of Unregistered Origin ASNs (Global)
> -----------------------------------------
>
> Bad AS  Designation  Network              Transit AS  Description
> 16927   UNALLOCATED   12.0.252.0/23         7018       AT&T WorldNet
> Servic
> 15132   UNALLOCATED   12.9.150.0/24         7018       AT&T WorldNet
> Servic
> 32567   UNALLOCATED   12.14.170.0/24        7018       AT&T WorldNet
> Servic
> 13746   UNALLOCATED   12.24.56.0/24         7018       AT&T WorldNet
> Servic
> 32567   UNALLOCATED   12.25.107.0/24        7018       AT&T WorldNet
> Servic
> 26973   UNALLOCATED   12.39.152.0/24        7018       AT&T WorldNet
> Servic
> 26973   UNALLOCATED   12.39.154.0/23        7018       AT&T WorldNet
> Servic
> 26973   UNALLOCATED   12.39.159.0/24        7018       AT&T WorldNet
> Servic
> 32326   UNALLOCATED   12.40.49.0/24         7018       AT&T WorldNet
> Servic
> 25639   UNALLOCATED   12.41.169.0/24        7018       AT&T WorldNet
> Servic
>
> Complete listing at http://thyme.apnic.net/current/data-badAS
>
> Advertised Unallocated Addresses
> --------------------------------
>
> Network            Origin AS  Description
> 41.223.92.0/22       36936     >>UNKNOWN<<
> 41.223.112.0/22       5713     Telkom SA Ltd
> 41.223.176.0/22      36981     >>UNKNOWN<<
> 41.223.188.0/24      22351     Intelsat
> 41.223.189.0/24      26452     Local Communications Networks
> 62.61.220.0/24       24974     Tachyon Europe BV - Wireless
> 62.61.221.0/24       24974     Tachyon Europe BV - Wireless
> 63.140.213.0/24      22555     Universal Talkware Corporatio
> 63.143.251.0/24      22555     Universal Talkware Corporatio
> 64.31.32.0/19        11955     ServiceCo LLC - Road Runner
>
> Complete listing at http://thyme.apnic.net/current/data-add-IANA
>
> Number of prefixes announced per prefix length (Global)
> -------------------------------------------------------
>
>  /1:0        /2:0        /3:0        /4:0        /5:0        /6:0
>  /7:0        /8:19       /9:10      /10:24      /11:58      /12:169
> /13:350     /14:619     /15:1171    /16:10574   /17:4763    /18:8324
> /19:17206   /20:20600   /21:20446   /22:26358   /23:26224   /24:153360
> /25:904     /26:1027    /27:574     /28:157     /29:8       /30:7
> /31:1       /32:8
>
> Advertised prefixes smaller than registry allocations
> -----------------------------------------------------
>
>  ASN   No of nets  Total ann.   Description
>  6389     2740          4224      bellsouth.net, inc.
>  4766     1400          1714      Korea Telecom (KIX)
> 17488     1290          1543      Hathway IP Over Cable Interne
>  1785     1189          1719      PaeTec Communications, Inc.
> 11492     1055          1129      Cable One
> 18566     1043          1062      Covad Communications
>  4323      967          1912      Time Warner Telecom
>  9583      967          1114      Sify Limited
>  8452      947          1025      TEDATA
> 10620      872           964      TVCABLE BOGOTA
>
> Complete listing at http://thyme.apnic.net/current/data-sXXas-nos
>
> Number of /24s announced per /8 block (Global)
> ----------------------------------------------
>
>   4:14        8:210      12:2134     13:7        15:19       16:3
>  17:5        20:35       24:1111     32:52       34:2        38:583
>  40:98       41:1721     43:1        44:2        47:22       52:6
>  53:2        55:2        56:2        57:24       58:597      59:649
>  60:462      61:1081     62:1111     63:2004     64:3704     65:2407
>  66:3583     67:1680     68:860      69:2731     70:550      71:152
>  72:1652     73:2        74:1644     75:175      76:340      77:849
>  78:586      79:355      80:955      81:852      82:591      83:453
>  84:634      85:1063     86:372      87:670      88:373      89:1479
>  90:50       91:2425     92:384      93:1090     94:1107     95:1194
>  96:157      97:240      98:256      99:28      110:168     111:365
>  112:117     113:147     114:241     115:350     116:1119    117:555
>  118:338     119:757     120:147     121:782     122:1056    123:685
>  124:980     125:1377    128:225     129:222     130:128     131:414
>  132:74      133:10      134:186     135:43      136:224     137:165
>  138:167     139:82      140:446     141:123     142:384     143:377
>  144:361     145:48      146:390     147:152     148:529     149:221
>  150:206     151:193     152:145     153:148     154:2       155:275
>  156:167     157:301     158:118     159:343     160:289     161:156
>  162:272     163:165     164:474     165:515     166:466     167:361
>  168:709     169:176     170:481     171:41      172:10      173:324
>  174:269     178:1       180:4       186:109     187:145     188:350
>  189:573     190:2941    192:5790    193:4259    194:3298    195:2692
>  196:1127    198:3641    199:3363    200:5133    201:1285    202:7740
>  203:8287    204:3892    205:2135    206:2443    207:2737    208:3893
>  209:3449    210:2534    211:1106    212:1662    213:1618    214:80
>  215:29      216:4550    217:1365    218:405     219:450     220:1104
>  221:479     222:328
>
> End of report
>
>



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