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AS65000 BGP Routing Table Analysis Report


	BGP data obtained from AS65000 Report last updated at Thu May 15 21:10:16 2008 (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)	265710	Change in FIB Size	-242	Change (%)	-0.091
All BGP entries (RIB)	776761
RIB/FIB ratio (776761/265710)	2.9233
Valid entries	776761
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)	1853908196
Total address space advertised (prefix length)	1.21207734
Percentage of IPv4 space advertised (1853908196/4294967295)	43.164664
Total address space advertised - corrected to 19 /8s	(data)
Average address span	6977
Average address span (as prefix size)	19.2316
Average prefix length	22.3627

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	141729	Specifics as % of FIB entries (141729/265710)	53.3397
Specifics as % of address span (482114046/1853908196)	26.0053
Specifics where AS prepended Path matches aggregate	50510	AS-P_Path-Match % (50510/141729)	35.64
AS Path matches aggregate	51974	AS-Path-Match % (51974/141729)	36.6714
AS Origin matches aggregate	88316	AS-Origin-Match % (88316/141729)	62.3133
Root Prefixes	123980
Root Prefix Tree Depth	(data)
Root Prefixes with depth 0	109137
Root Prefixes with depth 1	12020
Root Prefixes with depth 2	2270
Root Prefixes with depth 3	451
Root Prefixes with depth 4	86
Root Prefixes with depth 5	12
Root Prefixes with depth 6	4

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	28290	ASes visible in only one AS path	18902
Origin only ASes	24424	Origin ASs announced via a single AS path	18674
Transit only ASes	91	Originating AS ATOM count	28199
Mixed ASes	3775	Originating AS ATOM compression	0.1061
Multi-Origin Prefixes	449
ASes originating a single prefix	11898
Average entries per origin AS	9.4227	Maximum entries for an origin AS (AS44015)	39
Average address range span for an origin AS	65743.7567	Maximum address range for an origin AS (AS721)	88359936

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	120189	Unique AS prepended Paths	124288
AS Paths used in FIB	41962	AS Paths using prepending	17330
AS paths associated with a single FIB entry	20790	AS Paths using private ASs	13
Average AS path length	5.0123	Maximum AS Path length	14
Average address weighted AS path length	5.7793	Maximum prepended AS Path length	30
Average entries per AS Path	2.2108	Average entries per FIB AS Path	6.3322
AS Paths per origin AS	4.2622	FIB AS Paths per origin AS	1.4881
AS PATH ATOM compression	0.1579

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	18	% Prefix /8	0.01
Prefix count /9	9	% Prefix /9	0.00
Prefix count /10	16	% Prefix /10	0.01
Prefix count /11	41	% Prefix /11	0.02
Prefix count /12	141	% Prefix /12	0.05
Prefix count /13	286	% Prefix /13	0.11
Prefix count /14	516	% Prefix /14	0.19
Prefix count /15	1011	% Prefix /15	0.38
Prefix count /16	10043	% Prefix /16	3.78
Prefix count /17	4476	% Prefix /17	1.68
Prefix count /18	7419	% Prefix /18	2.79
Prefix count /19	15717	% Prefix /19	5.92
Prefix count /20	18926	% Prefix /20	7.12
Prefix count /21	17916	% Prefix /21	6.74
Prefix count /22	22315	% Prefix /22	8.40
Prefix count /23	23486	% Prefix /23	8.84
Prefix count /24	138145	% Prefix /24	51.99
Prefix count /25	1088	% Prefix /25	0.41
Prefix count /26	1248	% Prefix /26	0.47
Prefix count /27	742	% Prefix /27	0.28
Prefix count /28	502	% Prefix /28	0.19
Prefix count /29	747	% Prefix /29	0.28
Prefix count /30	588	% Prefix /30	0.22
Prefix count /31	1	% Prefix /31	0.00
Prefix count /32	312	% Prefix /32	0.12

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	18	% Prefix /8	0.01
Prefix count /9	1	% Prefix /9	0.00
Prefix count /10	16	% Prefix /10	0.01
Prefix count /11	40	% Prefix /11	0.03
Prefix count /12	130	% Prefix /12	0.10
Prefix count /13	238	% Prefix /13	0.19
Prefix count /14	462	% Prefix /14	0.37
Prefix count /15	863	% Prefix /15	0.70
Prefix count /16	8403	% Prefix /16	6.78
Prefix count /17	2806	% Prefix /17	2.26
Prefix count /18	4696	% Prefix /18	3.79
Prefix count /19	10398	% Prefix /19	8.39
Prefix count /20	11206	% Prefix /20	9.04
Prefix count /21	8377	% Prefix /21	6.76
Prefix count /22	9513	% Prefix /22	7.67
Prefix count /23	9999	% Prefix /23	8.07
Prefix count /24	56738	% Prefix /24	45.76
Prefix count /25	39	% Prefix /25	0.03
Prefix count /26	18	% Prefix /26	0.01
Prefix count /27	5	% Prefix /27	0.00
Prefix count /28	1	% Prefix /28	0.00
Prefix count /29	0	% Prefix /29	0.00
Prefix count /30	13	% 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	256	% Addresses at AS distance 0	0.0
Addresses at AS distance 1	1793	% Addresses at AS distance 1	0.0
Addresses at AS distance 2	113813566	% Addresses at AS distance 2	4.9
Addresses at AS distance 3	1063879417	% Addresses at AS distance 3	45.5
Addresses at AS distance 4	891338868	% Addresses at AS distance 4	38.2
Addresses at AS distance 5	220608001	% Addresses at AS distance 5	9.4
Addresses at AS distance 6	34633416	% Addresses at AS distance 6	1.5
Addresses at AS distance 7	11139949	% Addresses at AS distance 7	0.5
Addresses at AS distance 8	586209	% Addresses at AS distance 8	0.0
Addresses at AS distance 9	6431	% Addresses at AS distance 9	0.0
Addresses at AS distance 10	14336	% Addresses at AS distance 10	0.0
Addresses at AS distance 11	0	% Addresses at AS distance 11	0.0
Addresses at AS distance 12	0	% Addresses at AS distance 12	0.0
Addresses at AS distance 13	0	% Addresses at AS distance 13	0.0

Cumulative Address by AS distance	(data)	Cumulative % Address by AS distance	(data)
Addresses reachable within 0 AS hops	256	% Addresses reachable within 0 AS hops	0
Addresses reachable within 1 AS hops	2049	% Addresses reachable within 1 AS hops	0
Addresses reachable within 2 AS hops	113815615	% Addresses reachable within 2 AS hops	4
Addresses reachable within 3 AS hops	1177695032	% Addresses reachable within 3 AS hops	50
Addresses reachable within 4 AS hops	2069033900	% Addresses reachable within 4 AS hops	88
Addresses reachable within 5 AS hops	2289641901	% Addresses reachable within 5 AS hops	98
Addresses reachable within 6 AS hops	2324275317	% Addresses reachable within 6 AS hops	99
Addresses reachable within 7 AS hops	2335415266	% Addresses reachable within 7 AS hops	99
Addresses reachable within 8 AS hops	2336001475	% Addresses reachable within 8 AS hops	99
Addresses reachable within 9 AS hops	2336007906	% Addresses reachable within 9 AS hops	99
Addresses reachable within 10 AS hops	2336022242	% Addresses reachable within 10 AS hops	100
Addresses reachable within 11 AS hops	2336022242	% Addresses reachable within 11 AS hops	100
Addresses reachable within 12 AS hops	2336022242	% Addresses reachable within 12 AS hops	100
Addresses reachable within 13 AS hops	2336022242	% Addresses reachable within 13 AS hops	100

ASes by AS distance	(data)	% ASes by AS hops	(data)
ASes reachable at 0 AS hops	7	% ASes reachable at 0 AS hops	0
ASes reachable at 1 AS hops	6	% ASes reachable at 1 AS hops	0
ASes reachable at 2 AS hops	49	% ASes reachable at 2 AS hops	0
ASes reachable at 3 AS hops	4034	% ASes reachable at 3 AS hops	14
ASes reachable at 4 AS hops	15845	% ASes reachable at 4 AS hops	56
ASes reachable at 5 AS hops	6788	% ASes reachable at 5 AS hops	23
ASes reachable at 6 AS hops	1372	% ASes reachable at 6 AS hops	4
ASes reachable at 7 AS hops	163	% ASes reachable at 7 AS hops	0
ASes reachable at 8 AS hops	23	% ASes reachable at 8 AS hops	0
ASes reachable at 9 AS hops	3	% ASes reachable at 9 AS hops	0
ASes reachable at 10 AS hops	0	% ASes reachable at 10 AS hops	0
ASes reachable at 11 AS hops	0	% ASes reachable at 11 AS hops	0
ASes reachable at 12 AS hops	0	% ASes reachable at 12 AS hops	0
ASes reachable at 13 AS hops	0	% ASes reachable at 13 AS hops	0

Cumulative ASes by AS hops	(data)	Cumulative % ASes by AS hops	(data)
ASes reachable by 0 AS hops	7	Cumulative % ASes by AS hops 0	0.0
ASes reachable by 1 AS hops	13	Cumulative % ASes by AS hops 1	0.0
ASes reachable by 2 AS hops	62	Cumulative % ASes by AS hops 2	0.2
ASes reachable by 3 AS hops	4096	Cumulative % ASes by AS hops 3	14.5
ASes reachable by 4 AS hops	19941	Cumulative % ASes by AS hops 4	70.5
ASes reachable by 5 AS hops	26729	Cumulative % ASes by AS hops 5	94.5
ASes reachable by 6 AS hops	28101	Cumulative % ASes by AS hops 6	99.3
ASes reachable by 7 AS hops	28264	Cumulative % ASes by AS hops 7	99.9
ASes reachable by 8 AS hops	28287	Cumulative % ASes by AS hops 8	100.0
ASes reachable by 9 AS hops	28290	Cumulative % ASes by AS hops 9	100.0
ASes reachable by 10 AS hops	28290	Cumulative % ASes by AS hops 10	100.0
ASes reachable by 11 AS hops	28290	Cumulative % ASes by AS hops 11	100.0
ASes reachable by 12 AS hops	28290	Cumulative % ASes by AS hops 12	100.0
ASes reachable by 13 AS hops	28290	Cumulative % ASes by AS hops 13	100.0

BGP Update Reports

Compares the current BGP Table with the previous table and reports on the number of changes in the FIB. These changes are further categorised into announcements, withdrawls and path changes, and further categorised by prefix length.

FIB Update Reports	Data	Announce	Data	Withdraw	Data	Path Chg	Data
Table Updates	2396	New Entries	73	Removed Entries	330	Updated Entries	1993
		Report		Report		Report
Address Span	21353870	Address Span	80256	Address Span	17112992	Address Span	4160622
Average address span per update	8912	Avg Span	1099	Avg Span	51857	Avg Span	2087
Average prefix size updated	25.08	Average prefix size	23.19	Average prefix size	23.22	Average prefix size	25.46
Per-Prefix updates	(data)	Prefix announcements	(data)	Prefix withdrawals	(data)	Prefix path updates	(data)
Prefix /8 total	1	Prefix /8 announcements	0	Prefix /8 withdrawals	1	Prefix /8 path updates	0
Prefix /9 total	0	Prefix /9 announcements	0	Prefix /9 withdrawals	0	Prefix /9 path updates	0
Prefix /10 total	0	Prefix /10 announcements	0	Prefix /10 withdrawals	0	Prefix /10 path updates	0
Prefix /11 total	0	Prefix /11 announcements	0	Prefix /11 withdrawals	0	Prefix /11 path updates	0
Prefix /12 total	1	Prefix /12 announcements	0	Prefix /12 withdrawals	0	Prefix /12 path updates	1
Prefix /13 total	0	Prefix /13 announcements	0	Prefix /13 withdrawals	0	Prefix /13 path updates	0
Prefix /14 total	0	Prefix /14 announcements	0	Prefix /14 withdrawals	0	Prefix /14 path updates	0
Prefix /15 total	0	Prefix /15 announcements	0	Prefix /15 withdrawals	0	Prefix /15 path updates	0
Prefix /16 total	20	Prefix /16 announcements	0	Prefix /16 withdrawals	0	Prefix /16 path updates	20
Prefix /17 total	9	Prefix /17 announcements	0	Prefix /17 withdrawals	0	Prefix /17 path updates	9
Prefix /18 total	38	Prefix /18 announcements	1	Prefix /18 withdrawals	6	Prefix /18 path updates	31
Prefix /19 total	56	Prefix /19 announcements	3	Prefix /19 withdrawals	6	Prefix /19 path updates	47
Prefix /20 total	72	Prefix /20 announcements	2	Prefix /20 withdrawals	12	Prefix /20 path updates	58
Prefix /21 total	85	Prefix /21 announcements	4	Prefix /21 withdrawals	21	Prefix /21 path updates	60