Internet Routing Table Analysis Update. Philip Smith RIPE Routing WG Amsterdam, January 2003
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1 Internet Routing Table Analysis Update Philip Smith RIPE Routing WG Amsterdam, January 2003
2 Recent Changes Exhaustive search of 192/8 space for unassigned addresses Now combined with IANA listing of former A- space and my search of former B-space Total available IPv4 address space outside registry blocks is now known accurately Unallocated address space BGP feed available
3 Recent Changes Unique Prefixes Represents the smallest the Internet Routing table can be without losing address space Probably not a very sensible concept to use on a router given the topology of the Internet Prefixes after maximum aggregation Represents aggregation effort by the AS (but obviously cannot account for traffic engineering) Represents the smallest the Internet Routing Table could be without the loss of any reachability information
4 Recent Changes (continued) Added LACNIC to report Allocations from 200/8 address space Allocations from AS blocks and Full Stats on APNIC web page
5 Routing Report 27 January, 2003 BGP routing table entries examined Prefixes after maximum aggregation Unique aggregates announced to Internet Total ASes present in the Internet Routing Table Origin-only ASes present in the Internet Routing Table Origin ASes announcing only one prefix 5652 Transit ASes present in the Internet Routing Table 1894 Transit-only ASes present in the Internet Routing Table 61 Average AS path length visible in the Internet Routing Table 5.3 Max AS path length visible 17 Illegal AS announcements present in the Routing Table 12 Non-routable prefixes present in the Routing Table 0 Prefixes being announced from the IANA Reserved Address blocks 26 Number of addresses announced to Internet Equivalent to 69 /8s, 243 /16s and 112 /24s Percentage of available address space announced 31.7 Percentage of allocated address space announced 57.5 Percentage of available address space allocated 55.0 Total number of prefixes smaller than registry allocations 55359
6 Global per AS prefix count summary ASN No of nets /20 equiv Max Agg Description UUNET Technologies, Inc AT&T Supernet, Inc Telstra Pty Ltd Sprint UUNET - Commercial IP service Telus Advanced Communications GENUITY Adelphia Corp UUNET Technologies, Inc Time Warner Communications, I Qwest Merit Network Virginia Polytechnic Institut BellSouth Network Solutions, Covad Communications UUNET Technologies, Inc AT&T Data Communications Serv BellSouth Network Solutions, EarthLink, Inc.
7 Global Aggregation Savings Summary ASN No of Nets Net Savings Description Supernet, Inc AT&T Covad Communications Adelphia Corp BellSouth Network Solutions, Time Warner Communications, I Telstra Pty Ltd Cable One UUNET Technologies, Inc EarthLink, Inc SAVVIS Communications Corpora Sprint USDA TELEFONICA DE ARGENTINA China Telecom (Group) UUNET Technologies, Inc Reseau Interordinateurs Scien Virginia Polytechnic Institut Telus Advanced Communications GENUITY
8 List of Illegal AS's Bad AS Designation Network Transit AS Description 1877 UNALLOCATED / Stupi, house man's p PRIVATE / California State Uni PRIVATE / California State Uni PRIVATE / California State Uni PRIVATE / California State Uni PRIVATE / California State Uni PRIVATE / California State Uni PRIVATE / California State Uni PRIVATE / California State Uni PRIVATE / California State Uni PRIVATE / California State Uni 5757 UNALLOCATED / UUNET Technologies, Number of prefixes announced by prefix length /1:0 /2:0 /3:0 /4:0 /5:0 /6:0 /7:0 /8:16 /9:3 /10:8 /11:12 /12:44 /13:91 /14:240 /15:443 /16:7314 /17:1559 /18:2842 /19:8044 /20:7866 /21:5665 /22:8591 /23:10270 /24:65807 /25:162 /26:175 /27:94 /28:77 /29:62 /30:97 /31:0 /32:43
9 Advertised IANA Reserved Addresses Network Origin AS Description / Exchange Point Blocks / DISO-UNRRA / Lucent Technologies / DISO-UNRRA / DISO-UNRRA / AT&T / NASA Ames Research Center / UUNET - Commercial IP service / Digital United Inc / Digital United Inc / Sonera Solution Autonomous Sy / Sonera Solution Autonomous Sy / Sonera Solution Autonomous Sy / Sonera Solution Autonomous Sy / NASA / AT&T continued...
10 Advertised IANA Reserved Addresses Network Origin AS Description / LANLINK autonomous system / LANLINK autonomous system / LANLINK autonomous system / LANLINK autonomous system / GT Group Telecom Services Cor / France Telecom / DISO-UNRRA / Adelphia Business Solutions / DISO-UNRRA / AUSNet, Inc.
11 Prefixes Smaller than Registry Allocations ASN No of nets Total ann. Description Supernet, Inc AT&T UUNET - Commercial IP service Merit Network Covad Communications UUNET Technologies, Inc Virginia Polytechnic Institut Adelphia Corp Sprint BellSouth Network Solutions, BellSouth Network Solutions, ImpSat Cable One TELEFONICA DE ARGENTINA UUNET Technologies, Inc France Telecom Transpac Charter Communications EarthLink, Inc AT&T Data Communications Serv Telecom Argentina Stet-France
12 BGP Routing Table Prefixes Mar 1999 Time Jan 2003
13 AS Growth Growth slowed down ASNs Mar 1999 Time Jan 2003
14 Unique Prefixes vs Max Aggregation Prefixes Mar 1999 Time Max Aggregation 8 Mar /10 withdrawn Total Prefixes Unique Prefixes Jan 2003
15 Prefixes sizes announced Prefixes Mar 1999 Time Jan 2003 /19s /20s /21s /22s /23s
16 /24s announced Total announcements Prefixes /24s Mar 1999 Time Jan 2003
17 Addresses announced Addresses (/32s) 1200 Millions Mar 1999 Time Jan 2003
18 AS Announcements ASes Mar 1999 Time Jan 2003 Total Origin Only Transit Transit Only
19 CIDR Report Update The New CIDR Report and Routing Table Update Geoff Huston & Philip Smith
20 What s Happening (AS4637) Date
21 Route Views View
22 BGP Trends Table growth appears to have resumed a linear growth rate of about 10,000 entries per year Is this a stable state? For how long? Will exponential growth resume? If so, at what rate?
23 Total Size of Address Space Advertised in the BGP Table
24 Number of AS s
25 Prefix Comparison /20 and /24 Number of Entries % of BGP Table /20 /24
26 What Happened Growth rates have come down The routing space appeared to be better managed in 2002 Less routing noise Better adherence to hierarchical aggregation in the routed address space
27 The CIDR Report Has moved its home! Rewritten to use the BGP Analysis as input Diagnosis not analysis Intended to show how greater efficiency in terms of BGP table size can be obtained without loss of routing and policy information Show what forms of origin AS aggregation could be performed and the potential benefit of such actions to the total table size
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34 Aggregation Potential AS Path AS Origin
35 Mixed News BGP Table growth has been slowed down considerably though the more careful use of aggregate routes in recently advertised networks. Despite this, it is still the case that up to 50% of the current BGP table is the outcome of inadequate control of routing information
36 BGP Analysis Resources CIDR Report Sent to routing-wg list Routing Report Sent to routing-wg list
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