[time-nuts] GPS, NTP, and Cisco routers...

Scott McGrath scmcgrath at gmail.com
Sun Oct 5 01:16:12 UTC 2008

What do you need to know about NTP on IOS? - I've been working with
Cisco gear longer than I care to admit and have a bunch of CC*
certifications but that's not relevant here

Generally IOS devices actually speak SNTP - Not sure whether they can
use an external reference clock I don't think so BUT it might be
possible to replace the cheap TCXO universally used by cisco with a
buffer circuit and derive your clock from there and configure the
device as a ntp server.    Let me peek inside one of the routers
hanging around here and I'll see what can be done

- Scott

On Fri, Oct 3, 2008 at 5:39 PM, Robert Vassar <rvassar at rob-vassar.com> wrote:
> I've been fiddling around with an old Cisco router here at the house
> to brush up.  We have an IPv6 project going at work, and our WAN
> provider provides no native transit, so I'm looking at doing some
> tunneling.  Anyhow... I discovered IOS 12.1 and above have native NTP
> capability.  I don't have the exhaustive IOS command reference, and I
> suspect it's a limited NTP implementation. I'm wondering if it's
> possible to tie a GPS unit to a router serial port and gain a stratum
> 0 refclock.
> Any Cisco guru's on the list?  :-)
> Cheers,
> Rob
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