[outages] Intermittent Level 3 outage/connectivity issues on Dallas edges?

[Jeremy Chadwick]

Please see my below post on this matter, which I posted only 2 days ago:

https://puck.nether.net/pipermail/outages/2013-January/005111.html

What you've shown in your mtr does not show any issue of any kind with
Level 3.  The packet loss shown at hops 4/5/6 does not "trickle down"
each subsequent hop (look at hop 7 onward for proof), nor is there any
sign of latency increase either.

On the other hand, the 2nd mtr you provided shows some degree of packet
loss starting at hop 2 (TW Telecom) which *does* "trickle down" through
all subsequent hops (egress).  If you want to know how many packets were
lost, look at the --order flag to mtr (I recommend --order=LSRNABW).

Plain and simple: talk to TW Telecom about the loss in their network.

-- 
| Jeremy Chadwick                                   jdc at koitsu.org |
| UNIX Systems Administrator                http://jdc.koitsu.org/ |
| Mountain View, CA, US                                            |
| Making life hard for others since 1977.             PGP 4BD6C0CB |

On Fri, Jan 25, 2013 at 05:46:27AM +1100, Chris Boulton wrote:
> Seeing connectivity issues as traffic passes through Level 3 in Dallas -
> not seeing the same issues for where routes converge (above.net in DFW)
> over our TW Telecom link.
> 
> Anybody else experiencing this as well?
> 
> Level 3:
> 
>  Host                                                     Loss%   Snt
> Last   Avg  Best  Wrst StDev
>  1. vlan358.car1.Houston1.Level3.net                       0.0%   167
>  105.9  80.5  31.7 276.4  59.8
>  2. ae-2-5.bar1.Houston1.Level3.net                        0.0%   167
> 32.5  34.6  32.2  93.8   7.3
>  3. ae-13-13.ebr1.Dallas1.Level3.net                       0.0%   167
> 39.5  37.4  36.7  41.2   0.9
>  4. ae-91-91.csw4.Dallas1.Level3.net                      65.1%   167
> 44.5  43.5  39.7  53.8   4.0
>  5. ae-4-90.edge2.Dallas3.Level3.net                       5.4%   166
> 37.1  37.9  36.1  75.6   5.1
>  6. ex-3-1-0.er1.dfw2.us.above.net                        66.1%   166
> 39.5  43.5  38.9 104.8  12.5
>  7. xe-3-1-0.cr1.dfw2.us.above.net                         0.0%   166
> 37.3  40.4  37.0 114.1  10.6
>  8. xe-0-0-0.er3.dfw2.us.above.net                         0.0%   166
> 36.2  39.8  36.1  99.3  10.2
> 
>  Host                                                     Loss%   Snt
> Last   Avg  Best  Wrst StDev
>  1. 50.58.18.1                                             0.0%   829
>  4.3  23.9   4.1 121.2  14.5
>  2. dal2-pr2-xe-0-3-0-0.us.twtelecom.net                   0.1%   829
> 55.4  31.2   9.4 121.0  17.2
>     dal2-pr2-xe-2-3-0-0.us.twtelecom.net
>  3. xe-3-0-0.er2.dfw2.us.above.net                         0.1%   829
> 44.8  31.6   9.5 143.7  17.9
>  4. xe-0-1-0.cr2.dfw2.us.above.net                         0.2%   829
> 40.5  31.2  10.3 116.2  15.9
>     xe-3-0-0.cr2.dfw2.us.above.net
>  5. xe-0-2-0.er3.dfw2.us.above.net                         0.2%   829
> 42.7  32.4   9.6 109.2  16.5
> 
> 
> 
> Regards,
> 
> Chris Boulton
> Bigcommerce
> 
> Email: chris at bigcommerce.com
> 
> Web: http://www.bigcommerce.com/

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