anycasting behind different ASNs?

Joe Abley jabley at ca.afilias.info
Thu Dec 7 15:41:24 UTC 2006


On 6-Dec-2006, at 13:05, bmanning at karoshi.com 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>




More information about the NANOG mailing list