[c-nsp] NTP Servers

[Mack McBride]

A good linux server will suffice.
6500s have a pretty wimpy CPU.
This is from a linux server with a cheap atom board:

assID=0 status=06f4 leap_none, sync_ntp, 15 events, event_peer/strat_chg,
version="ntpd 4.2.2p1 at 1.1570-o Fri Nov 18 13:21:21 UTC 2011 (1)",
processor="x86_64", system="Linux/2.6.18-274.7.1.el5", leap=00,
stratum=2, precision=-20, rootdelay=50.667, rootdispersion=30.974,
peer=51016, refid=xxx.xx.xx.xx,
reftime=d38fc77c.8a8b6adb  Fri, Jun 22 2012 22:41:32.541, poll=10,
clock=d38fcb62.931af16d  Fri, Jun 22 2012 22:58:10.574, state=4,
offset=0.538, frequency=-11.308, jitter=0.195, noise=0.396,
stability=0.001, tai=0

Most of the dispersion and jitter is related to latency.
Your results may vary but a number of Stratum 2 servers will help stabilize the server.
You should have three NTP servers in your environment to provide failure and inaccuracy resistance.

Mack

-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Andrew Miehs
Sent: Friday, June 22, 2012 5:14 PM
To: cisco-nsp at puck.nether.net
Subject: [c-nsp] NTP Servers

Hi Guys

Perhaps a little off topic -

Are any of you using NTP appliances? I am in an enterprise environment. We have also considered using a couple of my 6500s but my gut tells me that is not a good thing (tm).

We will be getting a stratum 1 feed from a local datacenter provider - and was looking at the various NTP boxes around - many of which with the ability to take a GSM clock source.
Any thoughts on which one of these is stable?


Thanks

Andrew
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