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Re: anycasting behind different ASNs?

  • From: Joe Abley
  • Date: Thu Dec 07 11:08:27 2006 
On 6-Dec-2006, at 13:05, [email protected] wrote:


	this is done today for the AS112 servers.
Actually, I think the origin AS of the AS112 prefix 192.175.48.0/24 is intended to be consistent, and the view from route-views.oregon- ix.net doesn't contradict that theory, in practice.

This isn't a rabid endorsement of using consistent origin ASes; merely an observation, since you mentioned it.


Joe


route-views.oregon-ix.net>show ip bgp 192.175.48.0
BGP routing table entry for 192.175.48.0/24, version 92957
Paths: (44 available, best #40, table Default-IP-Routing-Table)
Not advertised to any peer
3277 112, (aggregated by 112 194.85.103.253)
194.85.4.55 from 194.85.4.55 (194.85.4.16)
Origin IGP, localpref 100, valid, external
Community: 3277:65400 3277:65401
701 10913 10515 112
157.130.10.233 (inaccessible) from 157.130.10.233 (137.39.3.60)
Origin incomplete, localpref 100, valid, external
286 1257 8674 112
134.222.85.45 from 134.222.85.45 (134.222.85.45)
Origin IGP, localpref 100, valid, external
Community: 286:85 286:800 286:3031 286:4001
6395 6453 3557 112
216.140.2.59 from 216.140.2.59 (216.140.2.59)
Origin IGP, metric 20, localpref 100, valid, external
Community: 6395:200
16150 112
217.75.96.60 from 217.75.96.60 (217.75.96.60)
Origin IGP, metric 0, localpref 100, valid, external
Community: 16150:90 16150:63392 16150:64520 16150:65308 16150:65320 16150:65330
6079 174 27552 112
207.172.6.162 from 207.172.6.162 (207.172.6.162)
Origin IGP, metric 6, localpref 100, valid, external
7018 10515 112
12.0.1.63 from 12.0.1.63 (12.0.1.63)
Origin incomplete, localpref 100, valid, external
Community: 7018:2000
2905 701 10913 10515 112
196.7.106.245 from 196.7.106.245 (196.7.106.245)
Origin incomplete, metric 0, localpref 100, valid, external
5511 3557 112
193.251.245.6 from 193.251.245.6 (193.251.245.6)
Origin IGP, localpref 100, valid, external
6395 174 27552 112
216.140.8.59 from 216.140.8.59 (216.140.8.59)
Origin IGP, metric 20, localpref 100, valid, external
Community: 6395:200
12956 10429 22548 112
213.140.32.146 from 213.140.32.146 (213.140.32.146)
Origin IGP, localpref 100, valid, external
Community: 10429:110 10429:151 12956:1330 12956:2010 12956:2960 12956:3043 12956:3076 12956:3117 12956:3120 12956:3126 12956:3128 12956:3238 12956:3298 12956:3305 12956:3488 12956:3556 12956:3570 12956:3620 12956:3666 12956:3723 12956:3880 12956:3886 12956:4723 12956:4726 12956:4729 12956:4743 12956:7225 12956:15820 12956:15822
852 6461 3557 112
154.11.98.225 from 154.11.98.225 (154.11.98.225)
Origin IGP, metric 0, localpref 100, valid, external
Community: 852:180
852 6461 3557 112
154.11.11.113 from 154.11.11.113 (154.11.11.113)
Origin IGP, metric 0, localpref 100, valid, external
Community: 852:180
6939 112
216.218.252.145 from 216.218.252.145 (216.218.255.241)
Origin IGP, localpref 100, valid, external
2914 3557 112
129.250.0.85 from 129.250.0.85 (129.250.0.85)
Origin IGP, metric 92, localpref 100, valid, external
Community: 2914:410 2914:2000 2914:3000
5650 2914 3557 112
74.40.7.36 from 74.40.7.36 (74.40.0.11)
Origin IGP, metric 0, localpref 100, valid, external
5650 174 3557 112
74.40.7.35 from 74.40.7.35 (207.173.112.63)
Origin IGP, metric 0, localpref 100, valid, external
6539 19318 112
216.18.63.137 from 216.18.63.137 (216.18.63.137)
Origin IGP, localpref 100, valid, external
2914 3557 112
129.250.0.11 from 129.250.0.11 (129.250.0.88)
Origin IGP, metric 6, localpref 100, valid, external
Community: 2914:410 2914:2000 2914:3000
11608 3557 112
207.246.129.13 from 207.246.129.13 (207.246.129.15)
Origin IGP, localpref 100, valid, external
Community: 11608:444 11608:801 11608:1008 11608:6601
1668 6461 3557 112
66.185.128.48 from 66.185.128.48 (66.185.128.48)
Origin IGP, metric 504, localpref 100, valid, external
4513 19318 112
209.10.12.125 (inaccessible) from 209.10.12.125 (209.10.12.125)
Origin IGP, metric 8203, localpref 100, valid, external
4513 19318 112
209.10.12.28 (inaccessible) from 209.10.12.28 (209.10.12.31)
Origin IGP, metric 0, localpref 100, valid, external
6079 174 27552 112
207.172.6.20 from 207.172.6.20 (207.172.6.20)
Origin IGP, metric 0, localpref 100, valid, external
4513 3557 112
209.10.12.156 (inaccessible) from 209.10.12.156 (209.10.12.156)
Origin IGP, metric 0, localpref 100, valid, external
3356 12956 10429 22548 112
4.68.1.166 from 4.68.1.166 (4.68.1.166)
Origin IGP, metric 0, localpref 100, valid, external
Community: 3356:3 3356:22 3356:100 3356:123 3356:575 3356:2008 10429:110 10429:151 12956:1330 12956:2010 12956:2960 12956:3043 12956:3076 12956:3117 12956:3120 12956:3126 12956:3128 12956:3238 12956:3298 12956:3305 12956:3488 12956:3556 12956:3570 12956:3620 12956:3666 12956:3723 12956:3880 12956:3886 12956:4723 12956:4726 12956:4729 12956:4743 12956:7225 12956:15820 12956:15822
3549 4589 112, (suppressed due to dampening)
208.51.134.254 from 208.51.134.254 (67.17.81.162)
Origin IGP, metric 15808, localpref 100, valid, external
Community: 3549:4667 3549:31724 4589:2 4589:631 4589:13104
Dampinfo: penalty 11598, flapped 5345 times in 2d15h , reuse in 00:04:33
5459 16150 112
195.66.232.239 from 195.66.232.239 (195.66.232.239)
Origin IGP, localpref 100, valid, external
Community: 5459:1 5459:60 16150:1 16150:90 16150:63392 16150:64520 16150:65308 16150:65330
293 6509 2884 112
134.55.200.1 from 134.55.200.1 (134.55.200.1)
Origin incomplete, localpref 100, valid, external
Community: 293:15 293:42
3257 112
213.200.87.254 from 213.200.87.254 (213.200.87.40)
Origin IGP, metric 10, localpref 100, valid, external
2493 3602 812 19318 112
206.186.255.223 from 206.186.255.223 (206.186.255.223)
Origin IGP, localpref 100, valid, external
Community: 812:2 3602:65011 3602:65535
11537 6509 2884 112
198.32.8.196 from 198.32.8.196 (198.32.8.196)
Origin incomplete, metric 260, localpref 100, valid, external
Community: 11537:2501
1221 4637 3557 112
203.62.252.26 from 203.62.252.26 (203.62.252.26)
Origin IGP, localpref 100, valid, external
6453 3557 112
195.219.96.239 from 195.219.96.239 (195.219.96.239)
Origin IGP, localpref 100, valid, external
6453 3557 112
207.45.223.244 from 207.45.223.244 (207.45.196.93)
Origin IGP, localpref 100, valid, external
2497 7500 7500 7500 112
202.232.0.2 from 202.232.0.2 (202.232.0.2)
Origin IGP, localpref 100, valid, external
3333 112
193.0.0.56 from 193.0.0.56 (193.0.0.56)
Origin IGP, localpref 100, valid, external
3303 16150 112
164.128.32.11 from 164.128.32.11 (164.128.32.11)
Origin IGP, localpref 100, valid, external
Community: 3303:1004 3303:1006 16150:90 16150:64520 16150:65308 16150:65330
1239 9009 112
144.228.241.81 from 144.228.241.81 (144.228.241.81)
Origin IGP, metric 4294967294, localpref 100, valid, external
Community: 1239:123 1239:5000 1239:5090
3292 112
195.215.109.252 from 195.215.109.252 (83.88.48.14)
Origin IGP, localpref 100, valid, external, best
Community: 3292:1104 3292:1906
22388 11537 6509 2884 112
192.203.116.253 from 192.203.116.253 (192.203.116.253)
Origin incomplete, localpref 100, valid, external
Community: 11537:2501 22388:100
3561 12956 10429 22548 112
206.24.210.99 from 206.24.210.99 (206.24.210.99)
Origin IGP, localpref 100, valid, external
7660 2500 7500 7500 112
203.181.248.168 from 203.181.248.168 (203.181.248.168)
Origin IGP, localpref 100, valid, external
6509 2884 112
205.189.32.44 from 205.189.32.44 (205.189.32.44)
Origin incomplete, localpref 100, valid, external
Community: 2884:112 6509:65001 6509:65030
route-views.oregon-ix.net>