6PE

[Nuno Vieira - nfsi telecom]

Recently we've got a transit session with AS174 for IPv6, and i found out this strange thingie: 

traceroute to cogentco.com (2001:550:1::cc01) from 2001:b18:0:2:230:48ff:fed2:c50f, port 33434, from port 61752, 30 hops max, 60 byte packets
 1  2001:b18:0:2::ffff (2001:b18:0:2::ffff)  0.201 ms  0.124 ms  0.129 ms
 2  2001:978:2:32::1:1 (2001:978:2:32::1:1)  0.326 ms  0.273 ms  0.325 ms
 3  te1-2.ccr01.cbp01.atlas.cogentco.com (::ffff:130.117.49.178)  118.790 ms  117.157 ms  127.338 ms
 4  te0-0-0-3.ccr22.mad05.atlas.cogentco.com (::ffff:154.54.36.142)  117.189 ms  117.605 ms  117.436 ms
 5  te0-1-0-1.mpd22.par01.atlas.cogentco.com (::ffff:130.117.49.97)  109.776 ms  109.923 ms  109.871 ms
 6  ::ffff:154.54.46.105 (::ffff:154.54.46.105)  115.825 ms  115.700 ms  115.643 ms
 7  te0-3-0-6.mpd22.dca01.atlas.cogentco.com (::ffff:154.54.41.29)  110.893 ms  110.869 ms  110.925 ms
 8  2001:550:1::1 (2001:550:1::1)  118.937 ms  118.586 ms  118.602 ms
 9  cogentco.com (2001:550:1::cc01)  117.184 ms  117.272 ms  117.214 ms

and, in ipv4...  (ok, they have a server in germany..., but you can see the 3rd hop is similar (in ipv4)

traceroute to www.cogentco.com (38.100.128.10), 30 hops max, 60 byte packets
 1  xe13-10GE.xmr1.as25137.net (81.92.200.254)  0.240 ms  0.327 ms  0.367 ms
 2  gi9-4.ccr01.lis01.atlas.cogentco.com (149.6.144.41)  1.157 ms  1.153 ms  1.188 ms
 3  te1-2.ccr01.cbp01.atlas.cogentco.com (130.117.49.178)  4.026 ms te2-2.ccr01.cbp01.atlas.cogentco.com (130.117.49.186)  4.061 ms  4.103 ms
 4  te0-2-0-3.ccr21.mad05.atlas.cogentco.com (130.117.51.125)  11.274 ms te0-1-0-3.ccr21.mad05.atlas.cogentco.com (154.54.36.138)  11.166 ms te0-0-0-3.ccr21.mad05.atlas.cogentco.com (130.117.49.181)  11.355 ms
 5  te0-3-0-1.mpd21.par01.atlas.cogentco.com (154.54.56.121)  31.074 ms te0-1-0-1.ccr22.par01.atlas.cogentco.com (130.117.2.249)  31.089 ms te0-2-0-1.ccr21.par01.atlas.cogentco.com (130.117.3.46)  31.076 ms
 6  te0-0-0-0.mpd21.fra03.atlas.cogentco.com (130.117.1.241)  40.778 ms te0-1-0-0.ccr21.fra03.atlas.cogentco.com (130.117.2.13)  40.609 ms te0-0-0-0.ccr21.fra03.atlas.cogentco.com (130.117.0.29)  40.728 ms
 7  te3-1.mpd02.fra03.atlas.cogentco.com (130.117.48.54)  40.570 ms te4-6.mpd02.fra03.atlas.cogentco.com (154.54.36.77)  40.615 ms te3-2.mpd02.fra03.atlas.cogentco.com (130.117.49.157)  40.704 ms
 8  te2-4.ccr01.fra02.atlas.cogentco.com (154.54.38.197)  41.137 ms  41.796 ms  41.009 ms
 9  cogentco.com (38.100.128.10)  40.797 ms !X  40.765 ms !X  40.777 ms !X

the question is, where is the ipv6 backbone ? 

what are the pros and cons of doing it this way ?

regards,
--nvieira



----- Original Message -----
> What's the problem with 6PE? Whether the MPLS core is set up over
> IPv4
> or IPv6 should not matter.   Or am I missing something?
> 
> 
> Bjørn
>