BGP Routing Table Report

Feb 2017 - Anurag Bhatia - Hurricane Electric - BGP Table Report - APRICOT 2017 - Ho Chi Minh, Vietnam
BGP Routing Table Report
View of routing table between 2006 - 2016

Ranking top connected networks

Objective
Analysing changes in global routing table between 2006 to
2016
Analysis is along:
1. Top 5 well connected ASNs
2. Growth of ASNs
3. Growth of Prefixes
4. Changes in across multihomed networks

Networks with highest adjacencies (IPv4)
Year 2006 2007 2008 2009 2010 2011
Rank 1 AS701 AS701 AS701 AS3356 AS174 AS174
* Data belongs to Dec of each year

Networks with highest adjacencies (IPv4) (cont.)
Year 2012 2013 2014 2015 2016
Rank 1 AS174 AS174 AS174 AS174 AS6939
Rank 2 AS3356 AS3356 AS3356 AS3356 AS174
Rank 3 AS6939 AS6939 AS6939 AS6939 AS3356
Rank 4 AS7018 AS7018 AS7018 AS7018 AS3549
Rank 5 AS701 AS4323 AS4323 AS4323 AS7018

Summary of adjacencies (IPv4)
ASN 2006 2007 2008 2009 2010
AS701 2442 2720 2293 2090 1981
AS7018 2073 2104 2217 2294 2394
AS1239 1765 1723 1631 1449 1226
AS3356 1373 1746 2184 2656 2908
AS174 1612 1854 2192 2476 2931
AS6939 567 778 960 1312 1563
AS4323 839 1011 1175 1307 1322

ASN 2011 2012 2013 2014 2015 2016
AS701 1929 1656 1597 1511 1353 1337
AS7018 2446 2428 2431 2393 2422 2396
AS1239 1074 918 798 725 621 524
AS3356 3205 3480 3950 4150 4321 4680
AS174 3381 3747 4135 4489 4783 5025
AS6939 1871 2612 3190 3513 4173 6029
AS4323 1433 1593 1715 1897 1895 37

Year on year IPv4 peering change across top
ASNs

Year on Year peering change between 2006 - 2016

Year on Year peering change between 2006 - 2016 (cont)

Month 2006 2007 2008 2009 2010 2011

Month 2012 2013 2014 2015 2016
Rank 1 AS6939 AS6939 AS6939 AS6939 AS6939
Rank 2 AS3356 AS174 AS174 AS174 AS174
Rank 3 AS174 AS3356 AS3356 AS3356 AS3356
Rank 4 AS13030 AS13030 AS2914 AS37100 AS37100
Rank 5 AS3257 AS2914 AS1299 AS2914 AS1299

ASN 2006 2007 2008 2009 2010
AS3257 144 179 200 274 423
AS2914 115 162 191 210 281
AS30071 83 117 110 119 97
AS6175 75 94 100 100 72
AS3356 22 49 62 87 191
AS6939 21 160 335 659 1106
AS174 - - - 21 188

ASN 2011 2012 2013 2014 2015 2016
AS3257 412 482 511 553 670 700
AS2914 383 466 548 673 749 868
AS30071 154 261 291 290 260 174
AS6175 1 - - - - -
AS3356 507 732 973 1044 1146 1276
AS6939 1576 1950 2218 2471 2819 3589
AS174 505 737 1047 1221 1341 1548

Year on year IPv6 peering change across top
ASNs

Growth of ASNs between 2006 - 2016

Year on Year growth of ASNs (IPv4)
● Visible ASNs in Jan 2006: 21441
● Visible ASNs in Dec 2016: 56271
● Average change of 14.76% (every
year) for 11 year period

Year on Year growth of ASNs (IPv6)
● Visible ASNs in Jan 2006: 590
● Visible ASNs in Dec 2016: 12691
● Average change of 186.45%
(every year) for 10 year period

Growth of IPv4
Prefixes
Growth of unique IPv4
prefixes visible in
routing table between 2006
to 2016

Growth of IPv6
Prefixes
Growth of unique IPv6
prefixes visible in
routing table between 2006
to 2016

IPv4 Vs IPv6 ASN Comparison

Growth of multi-homing

Comparison of growth of adjacencies
Month 1 Peer 2 Peers 3 Peers 4 Peers 5 Peers Total Visible ASNs
Dec 2006 8424 9920 2319 970 498 24076
Dec 2007 9680 10894 2698 1080 575 27088
Dec 2008 11128 11931 2920 1226 680 30221
Dec 2009 12423 12767 3066 1389 781 33253
Dec 2010 13606 13948 3398 1467 814 36289
Dec 2011 14947 15028 3737 1675 913 39693
Dec 2012 16384 16134 4071 1804 1021 43022
Dec 2013 17205 17052 4670 2004 1146 45966
Dec 2014 18437 17951 4962 2187 1227 49184
Dec 2015 19839 18713 5461 2418 1347 52724
Dec 2016 21082 19520 5734 2636 1419 56271

Comparison of growth of adjacencies

How to get my ASN in the list?

Peer more!
● Follow & promote open peering policy
● Peer at Internet Exchange Points (IXPs)
● Start IXP in your home region if not there already
● Use peeringdb to list yourself & search for others
● Share your routing table to public route collectors -
Oregon routeviews, RIPE RIS, PCH collector etc.

Conclusions
● Peering is good. Remember somewhere down the transit path there’s a peering!
● More peerings = more entry & exit points in backbone giving tremendous flexibility, less points of
failure, capacity to deal with high amounts of traffic and lot more!
● Large sized IPv4 routing table will consume more resources, very slow BGP convergence etc resulting in
direct impact on networks
● Ironically unique IPv4 address not growing at the pace of internet will point to ugly reality of NATed
deployment in post IPv4 depletion stage
● IPv6 deployment by global networks needs to accelerate. Remember each IPv6 route origination carries
2^80 addresses at least
● IPv6 deployments need to be pushed all the way to the network edge to eyeballs to ensure scalable
future of the internet

Misc Points about the study
● There can be large content networks which have very high
amount of peering but not visible since neither side
dumps data in public route collector
● Announcements smaller than /24 in IPv4 and /48 in IPv6
are ignored
● This study measures adjacencies which includes all three
i.e peers, upstream & downstream

Thankyou!
Questions / Peering?
Email: anurag@he.net
Twitter: @anurag_bhatia
ASN: 6939
Web: http://he.net
Peeringdb: http://as6939.peeringdb.net

BGP Routing Table Report

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