That number is still too high since some people are advertising their /25 to
/32 prefixes to the route-views box..
Kris
That number is still too high since some people are advertising their /25 to
/32 prefixes to the route-views box..
true, but unless you do ingress filtering of your upstream
(which most smaller ASes do not do) your numbers may be
wrong. People also leak internal routes to route-views at
times also i've noticed.
(still talking about the same route-views snapshot)
count netmask
% cut -d: -f2 oix.home_as.out | cut -d/ -f2 | sort -n | uniq -c
25 8
6 9
7 10
12 11
36 12
99 13
269 14
514 15
9764 16
1537 17
2778 18
8378 19
8131 20
6075 21
9949 22
12258 23
73921 24
468 25
419 26
354 27
378 28
241 29
225 30
105 32
- jared
I still don't see where the excess 20K routes come from. Could these be
internal routes from an iBGP ?
BTW, we have similar histograms plotted on
http://www.multicasttech.com/status/cidr.html and given in
http://www.multicasttech.com/status/histogram.cidr.bgp
# cidr_histogram Unicast Prefix Size Histogram
# cidr_histogram Prefix Size | Number of Prefixes | Number of CIDR Holes | Number of Addresses | followed by relative PER CENTAGE in order
# cidr_histogram size # prfx # holes # addr % prfx % holes % addr
# cidr_histogram
cidr_histogram 1 0 0 0 0.0 0.0 0.0
cidr_histogram 2 0 0 0 0.0 0.0 0.0
cidr_histogram 3 0 0 0 0.0 0.0 0.0
cidr_histogram 4 0 0 0 0.0 0.0 0.0
cidr_histogram 5 0 0 0 0.0 0.0 0.0
cidr_histogram 6 0 0 0 0.0 0.0 0.0
cidr_histogram 7 0 0 0 0.0 0.0 0.0
cidr_histogram 8 20 3 335544280 0.0 0.0 28.0
cidr_histogram 9 6 1 50331636 0.0 0.0 4.2
cidr_histogram 10 7 2 29360114 0.0 0.0 2.5
cidr_histogram 11 12 1 25165800 0.0 0.0 2.1
cidr_histogram 12 36 12 37748664 0.0 0.0 3.2
cidr_histogram 13 87 28 45612882 0.1 0.0 3.8
cidr_histogram 14 235 59 61603370 0.2 0.1 5.1
cidr_histogram 15 415 102 54394050 0.4 0.2 4.5
cidr_histogram 16 7270 851 476432180 6.4 1.4 39.8
cidr_histogram 17 1452 475 47576232 1.3 0.8 4.0
cidr_histogram 18 2647 846 43363154 2.3 1.4 3.6
cidr_histogram 19 7672 2205 62833680 6.8 3.7 5.2
cidr_histogram 20 7429 2680 30414326 6.6 4.5 2.5
cidr_histogram 21 5212 3146 10663752 4.6 5.3 0.9
cidr_histogram 22 7929 5330 8103438 7.0 9.0 0.7
cidr_histogram 23 9682 6619 4937820 8.6 11.2 0.4
cidr_histogram 24 62823 36537 15957042 55.5 61.8 1.3
cidr_histogram 25 54 51 6804 0.0 0.1 0.0
cidr_histogram 26 25 23 1550 0.0 0.0 0.0
cidr_histogram 27 31 31 930 0.0 0.1 0.0
cidr_histogram 28 30 28 420 0.0 0.0 0.0
cidr_histogram 29 16 16 96 0.0 0.0 0.0
cidr_histogram 30 79 76 158 0.1 0.1 0.0
cidr_histogram 32 31 29 31 0.0 0.0 0.0
Note that you (or route views) sees 10K more /24 than we do, 3K more /23's, etc.
Regards
Marshall
Jared Mauch wrote:
The export policy of contributors to route-views collectors is not well-defined. While some participants might be sending a customer or peer view, others are quite likely including all kinds of deaggregated bloat which only has intra-AS application, and that would never normally be seen by a peer AS.
Joe