Level(3) ex-twtelecom midwest packet loss (4323)

Randy nanog at afxr.net
Fri Aug 28 18:48:26 UTC 2015


On 8/27/2015 11:00 PM, Mike Hammett wrote:
> 08/28/2015 3:08 AM GMT
> Event Conclusion Summary
>
> Start: August 27, 2015 13:20 GMT
> Stop: August 28, 2015 00:00 GMT
>
> Root Cause: A protocol issue impacted IP services in multiple markets.
> Fix Action: Adjustments were made to clear the errors.
>
> Summary:
> The IP NOC began investigating the root cause with Tier III Technical Support. It was reported that the issue was causing packet loss for customers. Operations Engineering teams were engaged, and Field Services were dispatched to a site in Chicago, IL to assist with investigations. Troubleshooting identified a protocol issue, and Operations Engineering worked with Tier III Technical Support to perform adjustments on the links. It was confirmed that the errors cleared. The traffic load was also lowered on cards in Chicago to alleviate any further issues. Should any additional impact be experienced, please contact the Level 3 Technical Service Center.
>
> What the hell is a "protocol issue"?
>
> I'm not an idiot, you can tell me specifically what happened...
I was having major issues yesterday. It wasn't with all traffic, and its 
seemed to have cleared up now.
I did do packet inspections, and I kept getting ethernet frame check 
errors from certain sources.
vast majority of packets did not have this extra data appended to the 
tcp portion of packet, and I think that is likely the reason for the 
issues, since those packets are supposed to be dropped if there is a 
checksum error. I'm by no means an expert, just voicing what I was seeing.

>
>
>
> -----
> Mike Hammett
> Intelligent Computing Solutions
> http://www.ics-il.com
>
> ----- Original Message -----
>
> From: "Ryan Gelobter" <ryan.g at atwgpc.net>
> To: "Mel Beckman" <mel at beckman.org>
> Cc: "<nanog at nanog.org>" <nanog at nanog.org>
> Sent: Thursday, August 27, 2015 3:14:59 PM
> Subject: Re: Level(3) ex-twtelecom midwest packet loss (4323)
>
> If you have access to the Level3 portal you should see ticket #9639047
> under Network Events now.
>
> Event Summary:IP Network Event ~ Multiple Markets
>
> 08/27/2015 8:05 PM GMT
>
> Level 3 Tier III and Operations Engineering teams have identified Internet
> Protocols dropping, affecting customer services. Restoration efforts are
> in progress, but an estimated time of restoral is not available at this
> time.
>
> 08/27/2015 6:36 PM GMT
>
> IP and Transport Tier III, Operations Engineering and Field Services
> continue collaboratively working the issue.
>
>
> 08/27/2015 4:59 PM GMT
>
> Operations Engineering is engaged and Field Services is on site in Chicago,
> IL investigating the issue.
>
>
> 08/27/2015 4:38 PM GMT
>
> The engineers are currently migrating traffic in efforts of restoring
> services while troubleshooting continues. Field Services is being
> dispatched to a Chicago, IL site to assist.
>
> 08/27/2015 4:21 PM GMT
>
> IP services are affected across multiple markets and the root cause is
> currently under investigation. The IP NOC and IP and Transport Tier III are
> actively troubleshooting and working to isolate the cause. The engineers
> have detected peering issues which are resulting in packet loss for
> customers. Please be advised that updates will be provided at minimum of
> hourly unless otherwise noted.
>




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