Backbone-News

Exactly 14 days after the “dispute” between Cogent and Telia started, it seems that both parties have finally reached an agreement.

Since 17:53 UTC today, there is again direct connectivity between both networks, and as a consequence customers on both networks can reach each others again.

Below is the view of the connectivity of one of the Cogent prefixes (38.0.0.0/8) as it was seen again today. (Click on the image for a larger version)

We did some test using the Cogent Looking Glass, and we can see that connectivity between both networks has been restored at multiple locations in the US and Europe.

Traceroute from Washington towards www.teliasonera.se:

 1 fa0-8.na01.b005944-0.dca01.atlas.cogentco.com (66.250.56.189) 4 msec 4 msec 0 msec
  2 gi3-9.3507.core01.dca01.atlas.cogentco.com (66.28.67.225) 4 msec 4 msec 4 msec
  3 te3-1.ccr02.dca01.atlas.cogentco.com (154.54.3.158) 4 msec 4 msec 0 msec
  4 vl3493.mpd01.dca02.atlas.cogentco.com (154.54.7.230) 4 msec
    te4-1.mpd01.dca02.atlas.cogentco.com (154.54.2.182) 0 msec 0 msec
  5 vl3494.mpd01.iad01.atlas.cogentco.com (154.54.5.42) 0 msec
    vl3497.mpd01.iad01.atlas.cogentco.com (154.54.5.66) 0 msec 4 msec
  6 ash-bb1-geth7-3-3-0.telia.net (213.248.88.41) 4 msec 4 msec 4 msec
  7 nyk-bb2-link.telia.net (80.91.250.18) 8 msec
    nyk-bb2-pos0-3-0.telia.net (213.248.80.137) 12 msec
    nyk-bb1-link.telia.net (213.248.83.21) 8 msec

Hop 6 is the first hop on the TeliaSonera network and the hostanme identifies this as Ashburn/US.

Traceroute from Los Angeles:

  1 gi10-0.224.core01.lax01.atlas.cogentco.com (66.250.4.5) 0 msec 4 msec 4 msec
  2 te3-1.mpd01.lax01.atlas.cogentco.com (154.54.2.102) 0 msec 0 msec 4 msec
  3 vl3492.mpd01.lax05.atlas.cogentco.com (154.54.3.10) 0 msec
    vl3493.mpd01.lax05.atlas.cogentco.com (154.54.6.230) 0 msec 0 msec
  4 gi0-0-0.core01.lax05.atlas.cogentco.com (154.54.6.185) 4 msec 4 msec 0 msec
  5 las-bb1-link.telia.net (213.248.72.177) 4 msec 4 msec 4 msec
  6 nyk-bb1-link.telia.net (80.91.254.18) 76 msec 72 msec 72 msec
  7 kbn-bb1-link.telia.net (80.91.249.25) 168 msec 172 msec 168 msec
  8 s-bb1-link.telia.net (213.248.65.141) 172 msec 176 msec 176 msec
  9 s-b4-link.telia.net (80.91.251.21) 176 msec 176 msec 176 msec

Hop 5 shows us the second interconnect in the US, located in LA.

Traceroute from Amsterdam:

 1 vl3.mpd01.ams03.atlas.cogentco.com (130.117.16.125) 0 msec 0 msec 4 msec
  2 gi2-0-0.core01.ams03.atlas.cogentco.com (130.117.0.33) 0 msec 0 msec 4 msec
  3 po1-0.core01.lon01.atlas.cogentco.com (130.117.1.225) 68 msec 220 msec 228 msec
  4 ldn-b4-link.telia.net (213.248.70.237) 8 msec 8 msec 12 msec
  5 ldn-bb1-link.telia.net (80.91.251.18) 8 msec
    ldn-bb1-link.telia.net (80.91.250.234) 8 msec 24 msec
  6 hbg-bb1-link.telia.net (80.91.250.220) 24 msec
    hbg-bb2-link.telia.net (80.91.254.218) 24 msec 24 msec

Hop 4 is the first router on the TeliaSonera network. This time located in London/UK.

Traceroute tests from the other Cogent routers in Europe all go through London, even from Stockholm, indicating that we London is the only interconnect between the two networks in Europe.