North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: BGP AS Sets in the wild
On Aug 23, 2005, at 4:36 AM, Abhishek Verma wrote: I was looking at route-views.routeviews.org for the BGP routes and i dont see any AS-Sets whatsoever. Are BGP routes with AS-SETs not generally leaked into the wild? Is this the case? Not quite, see below.. Well, yes, but mostly via proxy aggregation type stuff, which isn'tI am under the impression that AS_SETs are generated whenever there are some routes that are aggregated. Is there any other way also to generate AS_SETs in BGP? real common these days (i.e., dynamic proxy aggregation on behalf of downstream ASes). Yep, quite a few (I was just looking at this a while back for something else). As of a few hours ago, route-views had 45 unique prefixes that contained AS_SET path attributes. Interestingly enough, ~60% of those AS_SETs only contain a single AS -- hrmm. It's also interesting to see some of these AS_SETs, albeit only a couple, contain private AS space, I'm wondering if some naive implementations "remote-private-as"-type knob is letting them slip by inside AS_SETs on egress. [email protected]% grep { oix-full-snapshot-latest.dat | wc -l 1717 [email protected]% grep { oix-full-snapshot-latest.dat | grep \> | wc -l 45 [email protected]% grep { oix-full-snapshot-latest.dat | grep "^...[0-9]" * 24.223.128.0/17 129.250.0.11 1 0 2914 1668 10796 {11060,12262} i * 24.223.160.0/19 129.250.0.11 1 0 2914 1668 10796 {11060,12262} i *> 64.132.88.0/22 209.161.175.4 0 14608 4323 {33127} i *> 64.132.102.0/24 209.161.175.4 0 14608 4323 {32510} i * 64.132.220.0/23 129.250.0.11 17 0 2914 4323 {18664} i * 65.17.160.0/19 129.250.0.11 1 0 2914 1668 10796 {11060,12262} i * 65.189.0.0/16 129.250.0.11 17 0 2914 3356 10796 {11060,12262} i * 65.205.32.0/24 129.250.0.11 55 0 2914 10913 10913 26134 {30060} i * 65.221.0.0/19 129.250.0.11 0 0 2914 701 11486 {15297} i * 65.254.96.0/19 129.250.0.11 0 0 2914 7911 2552 {25662,25887} ? *> 66.162.17.0/24 209.161.175.4 0 14608 4323 {29704,65102} i * 66.163.160.0/19 129.250.0.11 7 0 2914 3561 26085 {14776} i * 82.135.152.0/21 129.250.0.11 0 0 2914 1299 8764 8764 8764 {31006,34037} i * 128.116.0.0 129.250.0.11 0 0 2914 7911 14041 {16519} i * 129.19.0.0 129.250.0.11 0 0 2914 7911 14041 {12145,16519} i *> 129.165.192.0/18 134.55.200.1 0 293 10886 1701 {270,65200} ? * 140.31.0.0 129.250.0.11 0 0 2914 701 668 {132,3381} i * 140.32.0.0 129.250.0.11 0 0 2914 701 668 {22,5957,14077} ? * 147.241.0.0 129.250.0.11 0 0 2914 701 668 {13} i * 147.249.0.0 129.250.0.11 0 0 2914 701 7381 {3561,6419,12178} i *> 168.215.137.0/24 209.161.175.4 0 14608 4323 {29704} i * 200.62.40.0/22 129.250.0.11 6 0 2914 5511 18747 {12180,23383,23520} i * 200.85.0.0/20 129.250.0.11 0 0 2914 701 26617 {17079} i * 201.217.192.0/19 129.250.0.11 6 0 2914 5511 18747 {26596} i * 202.30.88.0/23 129.250.0.11 5 0 2914 4766 3608 3608 3608 17832 {9494} i * 202.224.128.0/18 129.250.0.11 258 0 2914 4688 4688 4688 {18071} i * 206.169.96.0/22 129.250.0.11 17 0 2914 4323 {11636} i * 206.169.208.0/22 129.250.0.11 17 0 2914 4323 {21593} i * 207.19.96.0/21 129.250.0.11 0 0 2914 701 7381 {14455} i * 207.133.7.0 129.250.0.11 0 0 2914 209 721 27064 6026 {65535} i *> 207.235.48.0/20 209.161.175.4 0 14608 4323 {32258,32418,32434} i *> 207.250.94.0/23 209.161.175.4 0 14608 4323 {33395} i * 208.16.208.0/21 129.250.0.11 0 0 2914 701 7381 {14455} i * 208.142.248.0/21 129.250.0.11 0 0 2914 4436 14390 {27481} ? * 208.254.0.0/19 129.250.0.11 0 0 2914 701 11486 {12156} i * 209.159.192.0/18 129.250.0.11 47 0 2914 30167 20412 {14507} i * 209.213.209.0 129.250.0.11 0 0 2914 7911 6517 {21953} i *> 209.234.168.0/22 209.161.175.4 0 14608 4323 {5710} i * 210.23.192.0/19 129.250.0.11 4 0 2914 9299 9299 7491 {23862} i * 210.23.208.0/21 207.246.129.6 0 11608 2914 6453 7491 {23862} i * 210.23.208.0/20 207.246.129.6 0 11608 2914 6453 7491 {23862} i * 214.40.0.0/16 129.250.0.11 0 0 2914 209 721 27064 {27065,27066} i * 216.83.160.0/19 129.250.0.11 0 0 2914 701 7381 {14455} i *> 216.110.12.0/23 209.161.175.4 0 14608 4323 {35970} i *> 216.110.88.0/21 209.161.175.4 0 14608 4323 {32868} i * 216.203.0.0/18 129.250.0.11 0 0 2914 701 7381 {14033,14455,35938} i * 216.203.48.0/20 129.250.0.11 0 0 2914 701 7381 {14455} i -danny
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