NTP - Why NTP not synchronized, yet the router gets correct

From: Huan Pham (pnhuan@yahoo.com)
Date: Thu Oct 30 2008 - 10:44:28 ARST


Hi,
 
This should be a very simple question, but NTP always bugs me.
 
Scenario is simple. R6 is the NTP master, and R5 is client. It already takes
ages, but I could not get R5 clock synchronized (status = unsynchronized,
insane). Yet, R5 picks up the correct clock from R6, even after I reload the
router.
 
You may ask to manually set clock of the two routers close to each other,
so the synchronization will speed up. I've done that and it does not help.
Anyway, client already picks up the clock (from the Server), so no need to
manually set it. The question is what can I do to get R5 to show status =
synchronized, and "sane".
 
Any idea pls?
 
 
Rack1R6#sh run | in ntp
ntp source Loopback0
ntp master 5

 
Rack1R5#sh run | in ntp
ntp server 150.1.6.6
 
Rack1R5#sh ntp associations detail
150.1.6.6 configured, insane, invalid, stratum 5
ref ID 127.127.7.1, time CCB4C034.A6EF985D (23:22:28.652 UTC Thu Oct 30 2008)
our mode client, peer mode server, our poll intvl 1024, peer poll intvl 1024
root delay 0.00 msec, root disp 8354.68, reach 377, sync dist 8378.571
delay 47.67 msec, offset 154290.0900 msec, dispersion 0.06
precision 2**24, version 3
org time CCB4C049.1D3A1525 (23:22:49.114 UTC Thu Oct 30 2008)
rcv time CCB4BFAE.D9112EC7 (23:20:14.847 UTC Thu Oct 30 2008)
xmt time CCB4BFAE.CCD8B539 (23:20:14.800 UTC Thu Oct 30 2008)
filtdelay = 47.67 47.67 47.96 48.10 47.87 47.85 47.84 47.93
filtoffset = 154290. 154290. 154290. 154290. 154290. 154290. 154290. 154290.
filterror = 0.02 0.03 0.05 0.06 0.08 0.09 0.11 0.12

Rack1R5#sh ntp status
Clock is unsynchronized, stratum 16, no reference clock
nominal freq is 250.0000 Hz, actual freq is 250.0000 Hz, precision is 2**24
reference time is 00000000.00000000 (00:00:00.000 UTC Mon Jan 1 1900)
clock offset is 0.0000 msec, root delay is 0.00 msec
root dispersion is 0.00 msec, peer dispersion is 0.00 msec
 
 
(R5 after reload)
 
Rack1R5#sh clock
*23:25:13.371 UTC Thu Oct 30 2008
 
This is the same clock from R6.
 

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