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CenturyLink

We have two stratum-1 servers synced with GPS and a PTP feed from a provider that also provides PTP to market data systems, but we still have to monitor drift between system time and NIST time. Don't ask for the logic behind it, it's a regulation, not a technical requirement.

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Matthew Huff             | 1 Manhattanville Rd 
Director of Operations   | Purchase, NY 10577
OTA Management LLC       | Phone: 914-460-4039


-----Original Message-----
From: NANOG [mailto:nanog-bounces at nanog.org] On Behalf Of Stephen Satchell
Sent: Saturday, December 29, 2018 9:34 AM
To: nanog at nanog.org
Subject: Re: CenturyLink

On 12/28/18 3:23 PM, Yang Yu wrote:
> On Fri, Dec 28, 2018 at 12:05 AM Stephane Bortzmeyer <bortzmeyer at nic.fr> wrote:
>> Is this problem also responsible for the 911 outage? If so, the 
>> post-mortem analysis is not useful only for CenturyLink customers but 
>> for everyone on the west coast.
> 
> Looks like most time.nist.gov servers (3 x NIST sites on AS49) are 
> single homed on CenturyLink, anyone noticed NTP issues yesterday?
> 
> https://tf.nist.gov/tf-cgi/servers.cgi
> 

I have GPS-based Stratum 1 NTP appliances in my network, so I wouldn't see any issues.  I suspect many other operators are in the same situation.