Internet Routing Table Analysis Update. Philip Smith SANOG January 2011 Colombo
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1 Internet Routing Table Analysis Update Philip Smith SANOG January 2011 Colombo
2 Motivation 1998: No one was publishing any Internet routing table analysis Only CIDR-Report reporting on top 20 contributors to routing table, and top 20 bad aggregators With support of APNIC, my weekly reporting report started 23rd February 1999: Routing table size CIDR-Report style reporting on a per-rir basis and many other interesting features
3 Routing Report 17 January 2011 BGP routing table entries examined: Prefixes after maximum aggregation: Deaggregation factor: 2.21 Unique aggregates announced to Internet: Total ASes present in the Internet Routing Table: Prefixes per ASN: 9.58 Origin-only ASes present in the Internet Routing Table: Origin ASes announcing only one prefix: Transit ASes present in the Internet Routing Table: 4924 Transit-only ASes present in the Internet Routing Table: 122 Average AS path length visible in the Internet Routing Table: 4.3 Max AS path length visible: 33 Max AS path prepend of ASN (36992) 29 Prefixes from unregistered ASNs in the Routing Table: 323 Unregistered ASNs in the Routing Table: 131 Number of 32-bit ASNs allocated by the RIRs: 1010 Prefixes from 32-bit ASNs in the Routing Table: 4 Special use prefixes present in the Routing Table: 0 Prefixes being announced from unallocated address space: 214 Number of addresses announced to Internet: Equivalent to 145 /8s, 35 /16s and 73 /24s Percentage of available address space announced: 65.7 Percentage of allocated address space announced: 67.8 Percentage of available address space allocated: 96.8 Percentage of address space in use by end-sites: 87.6 Total number of prefixes smaller than registry allocations:
4 APNIC Region Prefixes being announced by APNIC Region ASes: Total APNIC prefixes after maximum aggregation: APNIC Deaggregation factor: 2.94 Prefixes being announced from the APNIC address blocks: Unique aggregates announced from the APNIC address blocks: APNIC Region origin ASes present in the Internet Routing Table: 4293 APNIC Prefixes per ASN: APNIC Region origin ASes announcing only one prefix: 1209 APNIC Region transit ASes present in the Internet Routing Table: 690 Average APNIC Region AS path length visible: 4.4 Max APNIC Region AS path length visible: 20 Number of APNIC addresses announced to Internet: Equivalent to 34 /8s, 144 /16s and 124 /24s Percentage of available APNIC address space announced: 78.6 APNIC AS Blocks , , , (pre-erx allocations) , , , APNIC Address Blocks 1/8, 14/8, 27/8, 36/8, 42/8, 43/8, 49/8, 58/8 to 61/8, 101/8, 110/8 to 126/8, 133/8, 175/8, 180/8, 182/8, 183/8, 202/8, 203/8, 210/8, 211/8, 218/8 to 223/8
5 Global per AS prefix count summary ASN No of nets /20 equiv Max Agg Description bellsouth.net, inc Time Warner Telecom Korea Telecom (KIX) Verizon Global Networks PaeTec Communications, Inc TPG Internet Pty Ltd Charter Communications AT&T Worldnet Services PT TELEKOMUNIKASI INDONESIA TATA Communications formerly AT&T WorldNet Services TVCABLE BOGOTA UniNet S.A. de C.V AT&T Data Communications Serv Cable One Cox Communications, Inc NET Servicos de Comunicao S.A Citizens Utilities Level 3 Communications, LLC AVANTEL, S.A.
6 Number of prefixes announced by prefix length /1:0 /2:0 /3:0 /4:0 /5:0 /6:0 /7:0 /8:25 /9:10 /10:25 /11:70 /12:214 /13:437 /14:759 /15:1350 /16:11456 /17:5596 /18:9269 /19:18750 /20:24156 /21:24438 /22:32300 /23:31182 /24: /25:968 /26:1070 /27:569 /28:154 /29:12 /30:2 /31:0 /32:8 January 2011 January 2010 Number of prefixes announced by prefix length /1:0 /2:0 /3:0 /4:0 /5:0 /6:0 /7:0 /8:21 /9:10 /10:25 /11:66 /12:183 /13:383 /14:656 /15:1243 /16:10873 /17:5079 /18:8650 /19:17763 /20:21740 /21:21684 /22:28021 /23:28225 /24: /25:924 /26:1153 /27:586 /28:211 /29:9 /30:7 /31:0 /32:8
7 Prefixes Smaller than Registry Allocations ASN No of nets Total ann. Description bellsouth.net, inc Time Warner Telecom AT&T Worldnet Services TVCABLE BOGOTA Cable One Covad Communications Citizens Utilities PaeTec Communications, Inc Verizon Global Networks AVANTEL, S.A Cox Communications, Inc AT&T WorldNet Services NET Servicos de Comunicao S.A Level 3 Communications, LLC Alltel Information Services, Telecom Argentina Stet-France TEDATA Etisalat MISR Massachusetts Institute of Te CORPORACION NACIONAL DE TELEC
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9 Growth slowed down
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17 Looking at Deaggregation CIDR Report Encourages aggregation following CIDRisation of Internet Today: extensive suite of reports and tools covering state of BGP table Routing Report BGP table status on per RIR basis Original CIDR Report and a whole lot more
18 Deaggregation Factor Routing Report One summary takes BGP table and aggregates prefixes by origin AS Called Max Aggregation in report Global and per RIR basis Calculates Deaggregation Factor: Measure of Routing Table size/aggregated Size Global value has been increasing slowly and steadily since records began
19 January 2011 Total Prefixes Global BGP Table 341k prefixes Deaggregation Factor Global Average 2.21 Europe & Middle East 80k prefixes North America 138k prefixes Asia & Pacific 84k prefixes Africa 7k prefixes Latin America & Caribbean 31k prefixes Europe & Middle East 1.75 North America 1.95 Asia & Pacific 2.94 Africa 3.80 Latin America & Caribbean 4.33
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21 Asia Pacific Aggregation Savings Summary ASN No of Nets Savings Description TPG Internet Pty Ltd Korea Telecom (KIX) PT TELEKOMUNIKASI INDONESIA TATA Communications formerly Bharti Airtel Ltd., Telemedia Hathway IP Over Cable Interne BSNL National Internet Backbo Reliance Infocom Ltd Internet CNCGROUP IP network: China BHARTI Airtel Ltd Digital United Inc Vietel Corporation Softbank BB Corp Sify Limited Primus Telecommunications BSES TeleCom Limited CHINANET-BACKBONE Tata Communications Guangdong Mobile Communicatio iinet Limited
22 Importance of Aggregation Size of routing table Memory is no longer a problem Routers can be specified to carry 1 million prefixes Convergence of the Routing System This is a problem Bigger table takes longer for CPU to process BGP updates take longer to deal with BGP Instability Report tracks routing system update activity
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25 Observations Range of operational practices between RIR regions Deaggregation by newer ISPs & developing regions is growing rapidly Is harming the entire Internet RIPE-399 is only a recommendation Hopefully all the RIRs will include pointers with each address allocation Hopefully more ISPs will pay attention to it Training is there most ISPs choose to ignore it
26 Internet Routing Table Analysis Update Questions?
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