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AS6447 BGP Routing Table Analysis Report


	BGP data obtained from AS6447 Report last updated at Mon Apr 21 17:52:00 2003 (UTC+1000).

Active BGP entries (FIB)

Table Size Metrics

The trend of the size of the BGP Forwarding Table (FIB). Also the underlying BGP Routing Table (RIB). The RIB/FIB ratio is a function of the number of BGP peering sessions at the sample point. Some RIB entries are marked as unusable as an outcome of protocol operation, and these categories of unusable advertisements are tracked.

FIB / RIB Table Reports (plots)	Data Sets(txt)
Active BGP entries (FIB)	131174	Change in FIB Size	0	Change (%)	0.000
All BGP entries (RIB)	3340530
RIB/FIB ratio (3340530/131174)	25.4664
Valid entries	3340530
Suppressed RIB entries	0
Damped entries	0
History entries	0

Address Span Metrics

The total span of address space advertised in the BGP table, and the relationship of this value to the number and size of address prefix objects in the table.

Address Space Reports (plots)	Data Sets(txt)
Total address space advertised (/32 equiv)	1208461620
Total address space advertised (prefix length)	1.82947549
Percentage of IPv4 space advertised (1208461620/4294967295)	28.136690
Total address space advertised - corrected to 19 /8s	(data)
Average address span	9213
Average address span (as prefix size)	18.8307
Average prefix length	22.4710

More Specifics

The characteristics of more specific advertisements - where an advertisement is associated with a sub-span of address space of another advertisement. The metrics also look at the degree of similarity of the AS paths of the specific advertisements to the encompassing aggregate.

More-Specific Advertisement Reports (plots)	Data Sets(txt)	Percentage Reports (plots)	Data Sets(txt)
Entries advertising more specific prefixes of aggregates	72069	Specifics as % of FIB entries (72069/131174)	54.9415
Specifics as % of address span (140928385/1208461620)	11.6618
Specifics where AS prepended Path matches aggregate	8035	AS-P_Path-Match % (8035/72069)	11.15
AS Path matches aggregate	8130	AS-Path-Match % (8130/72069)	11.2809
AS Origin matches aggregate	11153	AS-Origin-Match % (11153/72069)	15.4754
Root Prefixes	59104
Root Prefix Tree Depth	(data)
Root Prefixes with depth 0	52065
Root Prefixes with depth 1	5805
Root Prefixes with depth 2	1070
Root Prefixes with depth 3	146
Root Prefixes with depth 4	17
Root Prefixes with depth 5	1

AS Numbers

The time trend of the number of unique AS numbers advertised within the BGP table. The associated metrics characterise AS's into origin only, transit only, or mixed (origin and transit), and also look at the trends of advertised address space as related to the number of ASes.

AS Reports (plots)	Data Sets(txt)	Additional Reports (plots)	Data Sets(txt)
Unique ASes	15197	ASes visible in only one AS path	10099
Origin only ASes	12765	Origin ASs announced via a single AS path	9757
Transit only ASes	87	Originating AS ATOM count	15110
Mixed ASes	2345	Originating AS ATOM compression	0.1152
Multi-Origin Prefixes	1000
ASes originating a single prefix	5907
Average entries per origin AS	8.6813	Maximum entries for an origin AS (AS15290)	814
Average address range span for an origin AS	79977.6056	Maximum address range for an origin AS (AS7018)	46419456

AS Paths

The time trend of the number of unique AS Paths advertised within the BGP table. The associated metrics look at trends of average path length, and BGP table entries per path.

AS Reports (plots)	Data Sets(txt)	Additional Reports (plots)	Data Sets(txt)
Unique AS Paths	435613	Unique AS prepended Paths	452190
AS Paths used in FIB	21096	AS Paths using prepending	76613
AS paths associated with a single FIB entry	10111	AS Paths using private ASs	59
Average AS path length	3.6080	Maximum AS Path length	11
Average address weighted AS path length	3.8504	Maximum prepended AS Path length	31
Average entries per AS Path	0.3011	Average entries per FIB AS Path	6.2180
AS Paths per origin AS	28.8295	FIB AS Paths per origin AS	1.3962
AS PATH ATOM compression	0.1608

Prefix Length Distributions

The time trend of the distribution of BGP Table entries by address prefix length.

Prefix Length Reports (plots)	Data Sets(txt)	Percentage Reports (plots)	Data Sets(txt)
Prefix Count	(data)	% Prefix distribution	(data)
Prefix count /8	17	% Prefix /8	0.01
Prefix count /9	4	% Prefix /9	0.00
Prefix count /10	8	% Prefix /10	0.01
Prefix count /11	13	% Prefix /11	0.01
Prefix count /12	50	% Prefix /12	0.04
Prefix count /13	96	% Prefix /13	0.07
Prefix count /14	252	% Prefix /14	0.19
Prefix count /15	465	% Prefix /15	0.35
Prefix count /16	7412	% Prefix /16	5.65
Prefix count /17	1700	% Prefix /17	1.30
Prefix count /18	2996	% Prefix /18	2.28
Prefix count /19	8432	% Prefix /19	6.43
Prefix count /20	8490	% Prefix /20	6.47
Prefix count /21	6146	% Prefix /21	4.69
Prefix count /22	9052	% Prefix /22	6.90
Prefix count /23	10872	% Prefix /23	8.29
Prefix count /24	70754	% Prefix /24	53.94
Prefix count /25	408	% Prefix /25	0.31
Prefix count /26	284	% Prefix /26	0.22
Prefix count /27	385	% Prefix /27	0.29
Prefix count /28	656	% Prefix /28	0.50
Prefix count /29	963	% Prefix /29	0.73
Prefix count /30	1088	% Prefix /30	0.83
Prefix count /31	6	% Prefix /31	0.00
Prefix count /32	625	% Prefix /32	0.48

Root Prefix Length Distributions

The time trend of the distribution of Root BGP Table entries by address prefix length.

Root Prefix Length Reports (plots)	Data Sets(txt)	Percentage Reports (plots)	Data Sets(txt)
Root Prefix Count	(data)	% Prefix distribution	(data)
Prefix count /8	17	% Prefix /8	0.03
Prefix count /9	3	% Prefix /9	0.01
Prefix count /10	8	% Prefix /10	0.01
Prefix count /11	13	% Prefix /11	0.02
Prefix count /12	47	% Prefix /12	0.08
Prefix count /13	84	% Prefix /13	0.14
Prefix count /14	243	% Prefix /14	0.41
Prefix count /15	442	% Prefix /15	0.75
Prefix count /16	7024	% Prefix /16	11.88
Prefix count /17	1165	% Prefix /17	1.97
Prefix count /18	2196	% Prefix /18	3.72
Prefix count /19	6021	% Prefix /19	10.19
Prefix count /20	5340	% Prefix /20	9.03
Prefix count /21	2249	% Prefix /21	3.81
Prefix count /22	3092	% Prefix /22	5.23
Prefix count /23	3488	% Prefix /23	5.90
Prefix count /24	27623	% Prefix /24	46.74
Prefix count /25	10	% Prefix /25	0.02
Prefix count /26	12	% Prefix /26	0.02
Prefix count /27	13	% Prefix /27	0.02
Prefix count /28	7	% Prefix /28	0.01
Prefix count /29	2	% Prefix /29	0.00
Prefix count /30	5	% Prefix /30	0.01
Prefix count /31	0	% Prefix /31	0.00
Prefix count /32	0	% Prefix /32	0.00

AS Diameter Reports

The time trend of the reacahbility of addresses and AS's using AS distance from the sample point to the origin AS as the diameter metric.

AS Diameter Reports (plots)	Data Sets(txt)	Percentage Reports (plots)	Data Sets(txt)
Addresses by AS distance	(data)	Address percentage by AS distance	(data)
Addresses at AS distance 0	0	% Addresses at AS distance 0	0.0
Addresses at AS distance 1	104073113	% Addresses at AS distance 1	7.7
Addresses at AS distance 2	697553860	% Addresses at AS distance 2	51.7
Addresses at AS distance 3	404867060	% Addresses at AS distance 3	30.0
Addresses at AS distance 4	126772223	% Addresses at AS distance 4	9.4
Addresses at AS distance 5	13997668	% Addresses at AS distance 5	1.0
Addresses at AS distance 6	2054945	% Addresses at AS distance 6	0.2
Addresses at AS distance 7	66368	% Addresses at AS distance 7	0.0
Addresses at AS distance 8	3488	% Addresses at AS distance 8	0.0
Addresses at AS distance 9	1024	% Addresses at AS distance 9	0.0
Addresses at AS distance 10	256	% Addresses at AS distance 10	0.0

Cumulative Address by AS distance	(data)	Cumulative % Address by AS distance	(data)
Addresses reachable within 0 AS hops	0	% Addresses reachable within 0 AS hops	0
Addresses reachable within 1 AS hops	104073113	% Addresses reachable within 1 AS hops	7
Addresses reachable within 2 AS hops	801626973	% Addresses reachable within 2 AS hops	59
Addresses reachable within 3 AS hops	1206494033	% Addresses reachable within 3 AS hops	89
Addresses reachable within 4 AS hops	1333266256	% Addresses reachable within 4 AS hops	98
Addresses reachable within 5 AS hops	1347263924	% Addresses reachable within 5 AS hops	99
Addresses reachable within 6 AS hops	1349318869	% Addresses reachable within 6 AS hops	99
Addresses reachable within 7 AS hops	1349385237	% Addresses reachable within 7 AS hops	99
Addresses reachable within 8 AS hops	1349388725	% Addresses reachable within 8 AS hops	99
Addresses reachable within 9 AS hops	1349389749	% Addresses reachable within 9 AS hops	99
Addresses reachable within 10 AS hops	1349390005	% Addresses reachable within 10 AS hops	100

ASes by AS distance	(data)	% ASes by AS hops	(data)
ASes reachable at 0 AS hops	1	% ASes reachable at 0 AS hops	0
ASes reachable at 1 AS hops	24	% ASes reachable at 1 AS hops	0
ASes reachable at 2 AS hops	5556	% ASes reachable at 2 AS hops	36
ASes reachable at 3 AS hops	7491	% ASes reachable at 3 AS hops	49
ASes reachable at 4 AS hops	1801	% ASes reachable at 4 AS hops	11
ASes reachable at 5 AS hops	285	% ASes reachable at 5 AS hops	1
ASes reachable at 6 AS hops	33	% ASes reachable at 6 AS hops	0
ASes reachable at 7 AS hops	6	% ASes reachable at 7 AS hops	0
ASes reachable at 8 AS hops	0	% ASes reachable at 8 AS hops	0
ASes reachable at 9 AS hops	0	% ASes reachable at 9 AS hops	0
ASes reachable at 10 AS hops	0	% ASes reachable at 10 AS hops	0

Cumulative ASes by AS hops	(data)	Cumulative % ASes by AS hops	(data)
ASes reachable by 0 AS hops	1	Cumulative % ASes by AS hops 0	0.0
ASes reachable by 1 AS hops	25	Cumulative % ASes by AS hops 1	0.2
ASes reachable by 2 AS hops	5581	Cumulative % ASes by AS hops 2	36.7
ASes reachable by 3 AS hops	13072	Cumulative % ASes by AS hops 3	86.0
ASes reachable by 4 AS hops	14873	Cumulative % ASes by AS hops 4	97.9
ASes reachable by 5 AS hops	15158	Cumulative % ASes by AS hops 5	99.7
ASes reachable by 6 AS hops	15191	Cumulative % ASes by AS hops 6	100.0
ASes reachable by 7 AS hops	15197	Cumulative % ASes by AS hops 7	100.0
ASes reachable by 8 AS hops	15197	Cumulative % ASes by AS hops 8	100.0
ASes reachable by 9 AS hops	15197	Cumulative % ASes by AS hops 9	100.0
ASes reachable by 10 AS hops	15197	Cumulative % ASes by AS hops 10	100.0

AS Announcement Reports

The time trend of total span of address space advertised by ASes, using truncated prefix length as the span metric.

AS Announcements Reports	Data Sets(txt)	Percentage Reports	Data
Originating Addresses AS Count	(data)	Originating Addresses % AS Count	(data)
AS's announcing span of /6	2	% AS's announcing span of /6	0.0001
AS's announcing span of /7	13	% AS's announcing span of /7	0.0009
AS's announcing span of /8	8	% AS's announcing span of /8	0.0005
AS's announcing span of /9	24	% AS's announcing span of /9	0.0016
AS's announcing span of /10	48	% AS's announcing span of /10	0.0032
AS's announcing span of /11	84	% AS's announcing span of /11	0.0056
AS's announcing span of /12	153	% AS's announcing span of /12	0.0102
AS's announcing span of /13	302	% AS's announcing span of /13	0.0201
AS's announcing span of /14	602	% AS's announcing span of /14	0.0401
AS's announcing span of /15	1311	% AS's announcing span of /15	0.0874
AS's announcing span of /16	1083	% AS's announcing span of /16	0.0722
AS's announcing span of /17	901	% AS's announcing span of /17	0.0601
AS's announcing span of /18	1478	% AS's announcing span of /18	0.0986
AS's announcing span of /19	1930	% AS's announcing span of /19	0.1287
AS's announcing span of /20	1546	% AS's announcing span of /20	0.1031
AS's announcing span of /21	1003	% AS's announcing span of /21	0.0669
AS's announcing span of /22	1081	% AS's announcing span of /22	0.0721
AS's announcing span of /23	1133	% AS's announcing span of /23	0.0756
AS's announcing span of /24	2272	% AS's announcing span of /24	0.1515
AS's announcing span of /25	6	% AS's announcing span of /25	0.0004
AS's announcing span of /26	6	% AS's announcing span of /26	0.0004
AS's announcing span of /27	4	% AS's announcing span of /27	0.0003
AS's announcing span of /28	2	% AS's announcing span of /28	0.0001
AS's announcing span of /29	4	% AS's announcing span of /29	0.0003
AS's announcing span of /30	0	% AS's announcing span of /30	0.0000
AS's announcing span of /31	0	% AS's announcing span of /31	0.0000
AS's announcing span of /32	0	% AS's announcing span of /32	0.0000

AS Connectivity Reports

This set of reports lists all visible AS's using a number of ordering criteria. The reports order AS's by the total span of addresses originated by an AS, the total span of addresses reachable via an AS, and the totspan of originating plus transit addresses via each AS. Each AS in an AS path has an adjacent AS closer to the sample point, and an adjacent AS further from the sample point. The number of such pairwise adjacencies is reported for each AS. The average AS Connectivity Degree is the average number of adjacent AS's for an AS.

yAzA yAzA yAzA

AS Connectivity Report	Data
AS Adjacency Count	29435
Average AS Connectivity Degree (58870/15197)	3.8738
Average AS Connectivity IN:OUT Degree	0.1650
AS Names
AS's ordered by Originating Address
AS's ordered by Transit Address
AS's ordered by Originating + Transit Address
AS's ordered by AS Adjacency
AS's ordered by Downstream AS Adjacency
AS's ordered by Upstream AS Adjacency
AS Adjacency
Inconsistent Origin AS Prefixes

Aggregation Reports

This set of reports lists all potential aggregation of a number of specific routes into an aggregate route. The aggregation criteria include a match of the original AS path, which may include prepended AS's, a match of the reduced AS Path, and a match on the Origin AS only. As this view is taken from a single sample point, this list is not definitive, and the report will propose potential aggregation actions which may not be feasible for the Origin AS. The report also applies a prefix length filter to all prefixes, accepting only those prefixes which pass the following ruleset:

24.0.0.0/8 accept prefix length <=20
61.0.0.0/8 accept prefix length <= 20
63.0.0.0/8 accept prefix length <= 20
64.0.0.0/8 accept prefix length <= 20
65.0.0.0/8 accept prefix length <= 20
66.0.0.0/8 accept prefix length <= 20
0.0.0.0/1 (0.0.0.0/8 through 126.0.0.0/8) accept prefix length <= 19
128.0.0.0/2 (128.0.0.0/8 through 191.0.0.0/8) accept prefix length <= 16
192.0.0.0/8 through 204.0.0.0/8 accept prefix length <=24
205.0.0.0/8 through 255.0.0.0/8 accept prefix length <=20

Aggregation possibilities are identified within this filtered prefix set.

Route Aggregation Reports	Data
Aggregation Potential Summary	(data)
Aggregation Potential Summary	(data)
Aggregation using prepended AS Path	104911	Report (sort by %reduction)	Report (sort by reduction)	BGP Table
Aggregation using AS Path	104443	Report (sort by %reduction)	Report (sort by reduction)	BGP Table
Aggregation using AS Origin	96724	Report (sort by %reduction)	Report (sort by reduction)	BGP Table
Maximal Aggregation	63130	Report (sort by %reduction)	Report (sort by reduction)	BGP Table
Prefix Length Filtered Aggregation Summary	(data)
Prefix length filtered	81147	Report (sort by %reduction)	Report (sort by reduction)
Prefix length filtered, Aggregation by prepended AS Path	67159	Report (sort by %reduction)	Report (sort by reduction)
Prefix length filtered, Aggregation by AS Path	66923	Report (sort by %reduction)	Report (sort by reduction)
Prefix length filtered, Aggregation by AS Origin	63169	Report (sort by %reduction)	Report (sort by reduction)
Prefix length filtered, Maximal Aggregation	59427	Report (sort by %reduction)	Report (sort by reduction)

BGP Table

Table Summary Report

BGP Report

BGP data obtained from the boundary of AS6447

Report last updated at Mon Apr 21 17:52:00 2003 (UTC+1000).

Data prior to 11 April 97 interpreted from data gathered by Erik-Jan Bos, SURFnet.

BGP table analyser written and maintained by Geoff Huston.

Footnote

The name is a reference to a graph of the data. If the data is a single series then this is a simple time-series plot. If the data is a multi-series vector, the first graph is a compound graph of the time series of each element in the vector, the second is a relative plot using a common start point and looking at the relative change in the value of each element of the vector. The third is a relative plot, normalizing the start point to zero and looking at the absolute change in each element of the vector. The last isa distribution graph.
The value is a reference to the text raw data file. The text file uses a column format, with the first column representing the measurement time. The time base is the number of seconds since 1 January 1970 UTC. If you wish to convert this to Microsoft Excel time format, then divide this time measurement by 86400 and add 25569, and then add the local offset to UTC