Re: anycasting behind different ASNs?

[Joe Abley <jabley () ca afilias info>]

On 6-Dec-2006, at 13:05, bmanning () 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>