[outages] GTT daily congestion in Europe

[CJ]

The congestion might be on the reverse path.  Can you get a trace route in
the opposite direction?

Thanks.

On Fri, Feb 4, 2022, 7:55 AM Lukas Tribus via Outages <outages at outages.org>
wrote:

> Dear list,
>
>
> There is major congestion for 8 - 10 hours every day on the GTT
> network from Frankfurt, Germany towards Milan, Italy.
>
> Before noon (localtime, that would be 1200~1300Z) things are looking
> fine but in the afternoon, packet-loss and latency increase steadily
> (peaking in the evening). We are talking packet-loss in excess of 10%
> and ten times the expected latency:
>
> lukas at htznr2:~$ mtr 62.10.128.1 -wrs1000 -c1000
> Start: 2022-02-03T21:33:28+0100
>
> HOST: htznr2                                   Loss%   Snt   Last
> Avg  Best  Wrst StDev
>   1.|-- _gateway                                  0.0%  1000    3.1
> 4.9   2.3  18.0   1.3
>   2.|-- 10114.your-cloud.host                     0.0%  1000    0.2
> 0.3   0.2   4.0   0.2
>   3.|-- ???                                      100.0  1000    0.0
> 0.0   0.0   0.0   0.0
>   4.|-- 85-10-250-153.clients.your-server.de      0.0%  1000    1.3
> 4.8   0.8  98.6  11.8
>   5.|-- spine12.cloud1.nbg1.hetzner.com           0.0%  1000    1.1
> 4.8   0.8  66.8  11.4
>   6.|-- 213-239-239-121.clients.your-server.de    0.0%  1000    3.0
> 2.3   0.5  43.4   4.1
>   7.|-- core1.fra.hetzner.com                     0.0%  1000    3.6
> 5.7   3.5  65.2   5.0
>   8.|-- ae18.cr6-fra2.ip4.gtt.net                 0.0%  1000    4.8
> 5.8   3.6 116.7   6.7
>   9.|-- et-5-1-0.cr0-mil2.ip4.gtt.net            11.1%  1000  114.0
> 112.3  63.5 172.7  13.4
>  10.|-- tiscali.ip4.gtt.net                      11.5%  1000  111.5
> 113.4  64.3 148.8  13.2
>  11.|-- static-94-32-126-81.clienti.tiscali.it   10.6%  1000  121.7
> 126.4  79.8 162.9  13.7
>  12.|-- static-94-32-135-162.clienti.tiscali.it  11.2%  1000  119.1
> 126.8  80.9 176.8  13.9
>  13.|-- static-94-32-135-182.clienti.tiscali.it  11.3%  1000  119.0
> 127.6  79.5 171.2  14.2
>  14.|-- static-213-205-54-210.clienti.tiscali.it 78.7%  1000  130.1
> 125.3  73.8 228.1  16.2
>  15.|-- ???                                      100.0  1000    0.0
> 0.0   0.0   0.0   0.0
> lukas at htznr2:~$
>
>
>
> 2022-02-01T18:10:07Z
> https://pastebin.com/raw/MSvuSuR0
>
> 2022-02-02T17:39:44Z
> https://pastebin.com/raw/zWD8GHGa
>
> 2022-02-03T20:33:28Z (as above)
> https://pastebin.com/raw/DHWDyi1g
>
> 2022-02-04T13:11:51Z
> https://pastebin.com/raw/qhrWZBQX
>
>
> GTT NOC has been advised Feb 1st, 18:000Z, but apparently they always
> verify network issues in the morning, which is also when those links
> are uncongested, so at this point there is no confirmation from them.
> I'm assuming the network teams are aware of it anyway, but we don't
> know for sure. If you are using GTT for transit in Europe and traffic
> to Italy matters to your customers, you probably want to reroute (for
> example: reducing loc-pref based on GTT's BGP community 3257:53900 for
> prefixes learned in Italy).
>
>
> cheers,
> lukas
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