[ntp:questions] NTP and asymetric delay

Danny Mayer mayer at ntp.isc.org
Sun May 6 19:40:57 UTC 2007

Stephen M. Dunn wrote:
> In article <463D4D64.7070100 at ntp.isc.org> mayer at ntp.isc.org writes:
> $emmanuel.python at bluewin.ch wrote:
> $> I use the version 3 of NTP on cisco routers and I see that if the 
> [...]
> $We don't support NTP v3 any more. If possible upgrade to V4.
>    Some versions of Cisco IOS support NTP v4, according to Cisco's
> Web site.  But I know that in some organizations where I've worked,
> if I proposed spending money to upgrade the OS for a router and
> the justification I gave was so that its timekeeping could improve
> by 10 ms (the difference cited in the original poster's question),
> I can imagine what the response would be, and it would not be
> favourable.

I'm intending to talk to Cisco shortly on another matter. I'll mention
it to them. However, since all the working is being done in V4 changes
have to go into that version. In any case even if we had the resources
for V3 I doubt that he would be able to upgrade the routers in the first
place. There's too much risk involved.


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