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AS4637 BGP Routing Table Analysis Report


	BGP data obtained from AS4637. Report last updated at Thu Jun 7 09:40:28 2007 (Australian Eastern Time).

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)	219581	Change in FIB Size	161	Change (%)	0.073
All BGP entries (RIB)	438605
RIB/FIB ratio (438605/219581)	1.9975
Valid entries	438605
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)	1734248096
Total address space advertised (prefix length)	1.30833685
Percentage of IPv4 space advertised (1734248096/4294967295)	40.378610
Total address space advertised - corrected to 19 /8s	(data)
Average address span	7898
Average address span (as prefix size)	19.0529
Average prefix length	22.2451

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	111560	Specifics as % of FIB entries (111560/219581)	50.8059
Specifics as % of address span (399897260/1734248096)	23.0588
Specifics where AS prepended Path matches aggregate	40559	AS-P_Path-Match % (40559/111560)	36.36
AS Path matches aggregate	42806	AS-Path-Match % (42806/111560)	38.3704
AS Origin matches aggregate	61869	AS-Origin-Match % (61869/111560)	55.4580
Root Prefixes	108021
Root Prefix Tree Depth	(data)
Root Prefixes with depth 0	95552
Root Prefixes with depth 1	10244
Root Prefixes with depth 2	1861
Root Prefixes with depth 3	292
Root Prefixes with depth 4	64
Root Prefixes with depth 5	6
Root Prefixes with depth 6	1
Root Prefixes with depth 7	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	25300	ASes visible in only one AS path	17728
Origin only ASes	17684	Origin ASs announced via a single AS path	17684
Transit only ASes	77	Originating AS ATOM count	25223
Mixed ASes	7539	Originating AS ATOM compression	0.1149
Multi-Origin Prefixes	89
ASes originating a single prefix	10736
Average entries per origin AS	8.7056	Maximum entries for an origin AS (AS7018)	1479
Average address range span for an origin AS	68756.6148	Maximum address range for an origin AS (AS721)	89785600

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	66880	Unique AS prepended Paths	69995
AS Paths used in FIB	33546	AS Paths using prepending	12812
AS paths associated with a single FIB entry	16237	AS Paths using private ASs	2
Average AS path length	3.6293	Maximum AS Path length	11
Average address weighted AS path length	3.9356	Maximum prepended AS Path length	27
Average entries per AS Path	3.2832	Average entries per FIB AS Path	6.5457
AS Paths per origin AS	2.6515	FIB AS Paths per origin AS	1.3300
AS PATH ATOM compression	0.1528

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	19	% Prefix /8	0.01
Prefix count /9	9	% Prefix /9	0.00
Prefix count /10	15	% Prefix /10	0.01
Prefix count /11	34	% Prefix /11	0.02
Prefix count /12	124	% Prefix /12	0.06
Prefix count /13	244	% Prefix /13	0.11
Prefix count /14	454	% Prefix /14	0.21
Prefix count /15	879	% Prefix /15	0.40
Prefix count /16	9411	% Prefix /16	4.29
Prefix count /17	3993	% Prefix /17	1.82
Prefix count /18	6373	% Prefix /18	2.90
Prefix count /19	13491	% Prefix /19	6.14
Prefix count /20	15507	% Prefix /20	7.06
Prefix count /21	14049	% Prefix /21	6.40
Prefix count /22	18301	% Prefix /22	8.33
Prefix count /23	19605	% Prefix /23	8.93
Prefix count /24	116692	% Prefix /24	53.14
Prefix count /25	42	% Prefix /25	0.02
Prefix count /26	50	% Prefix /26	0.02
Prefix count /27	60	% Prefix /27	0.03
Prefix count /28	64	% Prefix /28	0.03
Prefix count /29	45	% Prefix /29	0.02
Prefix count /30	36	% Prefix /30	0.02
Prefix count /31	0	% Prefix /31	0.00
Prefix count /32	84	% Prefix /32	0.04

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	19	% Prefix /8	0.02
Prefix count /9	1	% Prefix /9	0.00
Prefix count /10	15	% Prefix /10	0.01
Prefix count /11	33	% Prefix /11	0.03
Prefix count /12	114	% Prefix /12	0.11
Prefix count /13	205	% Prefix /13	0.19
Prefix count /14	419	% Prefix /14	0.39
Prefix count /15	767	% Prefix /15	0.71
Prefix count /16	8025	% Prefix /16	7.43
Prefix count /17	2651	% Prefix /17	2.45
Prefix count /18	4124	% Prefix /18	3.82
Prefix count /19	9424	% Prefix /19	8.72
Prefix count /20	10302	% Prefix /20	9.54
Prefix count /21	6408	% Prefix /21	5.93
Prefix count /22	7621	% Prefix /22	7.06
Prefix count /23	8119	% Prefix /23	7.52
Prefix count /24	49763	% Prefix /24	46.07
Prefix count /25	1	% Prefix /25	0.00
Prefix count /26	3	% Prefix /26	0.00
Prefix count /27	2	% Prefix /27	0.00
Prefix count /28	1	% Prefix /28	0.00
Prefix count /29	0	% Prefix /29	0.00
Prefix count /30	4	% Prefix /30	0.00
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	326145	% Addresses at AS distance 0	0.0
Addresses at AS distance 1	475199773	% Addresses at AS distance 1	22.3
Addresses at AS distance 2	1007163190	% Addresses at AS distance 2	47.2
Addresses at AS distance 3	431057400	% Addresses at AS distance 3	20.2
Addresses at AS distance 4	195932672	% Addresses at AS distance 4	9.2
Addresses at AS distance 5	22167040	% Addresses at AS distance 5	1.0
Addresses at AS distance 6	2267904	% Addresses at AS distance 6	0.1
Addresses at AS distance 7	30720	% Addresses at AS distance 7	0.0
Addresses at AS distance 8	512	% Addresses at AS distance 8	0.0
Addresses at AS distance 9	0	% Addresses at AS distance 9	0.0
Addresses at AS distance 10	0	% 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	326145	% Addresses reachable within 0 AS hops	0
Addresses reachable within 1 AS hops	475525918	% Addresses reachable within 1 AS hops	22
Addresses reachable within 2 AS hops	1482689108	% Addresses reachable within 2 AS hops	69
Addresses reachable within 3 AS hops	1913746508	% Addresses reachable within 3 AS hops	89
Addresses reachable within 4 AS hops	2109679180	% Addresses reachable within 4 AS hops	98
Addresses reachable within 5 AS hops	2131846220	% Addresses reachable within 5 AS hops	99
Addresses reachable within 6 AS hops	2134114124	% Addresses reachable within 6 AS hops	99
Addresses reachable within 7 AS hops	2134144844	% Addresses reachable within 7 AS hops	99
Addresses reachable within 8 AS hops	2134145356	% Addresses reachable within 8 AS hops	100
Addresses reachable within 9 AS hops	2134145356	% Addresses reachable within 9 AS hops	100
Addresses reachable within 10 AS hops	2134145356	% Addresses reachable within 10 AS hops	100

ASes by AS distance	(data)	% ASes by AS hops	(data)
ASes reachable at 0 AS hops	2	% ASes reachable at 0 AS hops	0
ASes reachable at 1 AS hops	206	% ASes reachable at 1 AS hops	0
ASes reachable at 2 AS hops	8939	% ASes reachable at 2 AS hops	35
ASes reachable at 3 AS hops	11347	% ASes reachable at 3 AS hops	44
ASes reachable at 4 AS hops	3873	% ASes reachable at 4 AS hops	15
ASes reachable at 5 AS hops	790	% ASes reachable at 5 AS hops	3
ASes reachable at 6 AS hops	131	% ASes reachable at 6 AS hops	0
ASes reachable at 7 AS hops	12	% 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	2	Cumulative % ASes by AS hops 0	0.0
ASes reachable by 1 AS hops	208	Cumulative % ASes by AS hops 1	0.8
ASes reachable by 2 AS hops	9147	Cumulative % ASes by AS hops 2	36.2
ASes reachable by 3 AS hops	20494	Cumulative % ASes by AS hops 3	81.0
ASes reachable by 4 AS hops	24367	Cumulative % ASes by AS hops 4	96.3
ASes reachable by 5 AS hops	25157	Cumulative % ASes by AS hops 5	99.4
ASes reachable by 6 AS hops	25288	Cumulative % ASes by AS hops 6	100.0
ASes reachable by 7 AS hops	25300	Cumulative % ASes by AS hops 7	100.0
ASes reachable by 8 AS hops	25300	Cumulative % ASes by AS hops 8	100.0
ASes reachable by 9 AS hops	25300	Cumulative % ASes by AS hops 9	100.0
ASes reachable by 10 AS hops	25300	Cumulative % ASes by AS hops 10	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	1306	New Entries	270	Removed Entries	83	Updated Entries	953
		Report		Report		Report
Address Span	8574273	Address Span	273024	Address Span	463360	Address Span	7837889
Average address span per update	6565	Avg Span	1011	Avg Span	5582	Avg Span	8224
Average prefix size updated	22.85	Average prefix size	23.37	Average prefix size	22.73	Average prefix size	22.71
Per-Prefix updates	(data)	Prefix announcements	(data)	Prefix withdrawals	(data)	Prefix path updates	(data)
Prefix /13 total	1	Prefix /13 announcements	0	Prefix /13 withdrawals	0	Prefix /13 path updates	1
Prefix /14 total	2	Prefix /14 announcements	0	Prefix /14 withdrawals	0	Prefix /14 path updates	2
Prefix /15 total	5	Prefix /15 announcements	0	Prefix /15 withdrawals	1	Prefix /15 path updates	4
Prefix /16 total	41	Prefix /16 announcements	1	Prefix /16 withdrawals	4	Prefix /16 path updates	36
Prefix /17 total	84	Prefix /17 announcements	1	Prefix /17 withdrawals	0	Prefix /17 path updates	83
Prefix /18 total	28	Prefix /18 announcements	1	Prefix /18 withdrawals	0	Prefix /18 path updates	27
Prefix /19 total	38	Prefix /19 announcements	2	Prefix /19 withdrawals	3	Prefix /19 path updates	33
Prefix /20 total	46	Prefix /20 announcements	6	Prefix /20 withdrawals	2	Prefix /20 path updates	38
Prefix /21 total	71	Prefix /21 announcements	17	Prefix /21 withdrawals	6	Prefix /21 path updates	48
Prefix /22 total	100	Prefix /22 announcements	16	Prefix /22 withdrawals	8	Prefix /22 path updates	76
Prefix /23 total	88	Prefix /23 announcements	33	Prefix /23 withdrawals	7	Prefix /23 path updates	48
Prefix /24 total	688	Prefix /24 announcements	192	Prefix /24 withdrawals	52	Prefix /24 path updates	444
Prefix /25 total	11	Prefix /25 announcements	1	Prefix /25 withdrawals	0	Prefix /25 path updates	10
Prefix /26 total	16	Prefix /26 announcements	0	Prefix /26 withdrawals	0	Prefix /26 path updates	16
Prefix /27 total	16	Prefix /27 announcements	0	Prefix /27 withdrawals	0	Prefix /27 path updates	16
Prefix /28 total	15	Prefix /28 announcements	0	Prefix /28 withdrawals	0	Prefix /28 path updates	15
Prefix /29 total	18	Prefix /29 announcements	0	Prefix /29 withdrawals	0	Prefix /29 path updates	18
Prefix /30 total	9	Prefix /30 announcements	0	Prefix /30 withdrawals	0	Prefix /30 path updates	9
Prefix /31 total	0	Prefix /31 announcements	0	Prefix /31 withdrawals	0	Prefix /31 path updates	0
Prefix /32 total	29	Prefix /32 announcements	0	Prefix /32 withdrawals	0	Prefix /32 path updates	29
Update rate, normalized by prefix count		Announce		Withdraw		Path Chg
Prefix