From: sony darrel (sonydarrel@gmail.com)
Date: Thu Mar 12 2009 - 15:13:48 ARST
Hello Experts,
i have 3 routers as seen below
172.28.250.1 172.28.250.2
( A ) ====== ( B )
\ /
\ /
\ ( C )/
172.28.250.12
My ntp master's are A& B with stratm 3 and C is the client with stratum 4
C is syn with B but when i shut the NTP source interface lo0 on B it doesnt
switchover to A?
config for A#
ntp source Loopback0
ntp master 3
ntp update-calendar
ntp peer 172.28.250.2
Router A# sh ntp status
Clock is synchronized, stratum 3, reference is 127.127.7.1
nominal freq is 250.0000 Hz, actual freq is 250.0000 Hz, precision is 2**24
reference time is CD639494.9152A106 (18:03:00.567 GST Thu Mar 12 2009)
clock offset is 0.0000 msec, root delay is 0.00 msec
root dispersion is 1260.01 msec, peer dispersion is 1260.01 msec
Router A#sh ntp associations
address ref clock st when poll
reach delay offset Disp
*~127.127.7.1 127.127.7.1 2 36 64
377 0.0 0.00 0.0
+~172.28.250.2 127.127.7.1 3 422 64
200 0.8 1680.0 16000.
* master (synced), # master (unsynced), + selected, - candidate, ~
configured
config for B#
config for B#sh run | in ntp
ntp source Loopback0
ntp master 3
ntp update-calendar
ntp peer 172.28.250.1
config for B#
address ref clock st when poll reach delay
offset disp
*~127.127.7.1 127.127.7.1 2 29 64 377 0.0
0.00 0.0
~172.28.250.1 127.127.7.1 3 2132 512 0 0.9
-1679. 16000.
* master (synced), # master (unsynced), + selected, - candidate, ~
configured
config for B#sh ntp status
Clock is synchronized, stratum 3, reference is 127.127.7.1
nominal freq is 250.0000 Hz, actual freq is 250.0000 Hz, precision is 2**18
reference time is CD63942C.95C4D794 (18:01:16.585 GST Thu Mar 12 2009)
clock offset is 0.0000 msec, root delay is 0.00 msec
root dispersion is 0.02 msec, peer dispersion is 0.02 msec
When I shut the INT LOOPBACK int 0 on B
ROUTER C###
sh ntp status
Clock is unsynchronized, stratum 16, no reference clock
nominal freq is 250.0000 Hz, actual freq is 250.0011 Hz, precision is 2**18
reference time is CD638ACF.D7F3B407 (17:21:19.843 GST Thu Mar 12 2009)
clock offset is 0.1141 msec, root delay is 1.05 msec
root dispersion is 0.26 msec, peer dispersion is 0.12 msec
ROUTER C#sh run | in ntp
ntp clock-period 17179791
ntp source Loopback0
ntp server 172.28.250.2
ntp server 172.28.250.1
sh ntp associations
address ref clock st when poll
reach delay offset disp
~172.28.250.2 127.127.7.1 3 2623 64 0
1.1 0.11 16000.
~172.28.250.1 127.127.7.1 3 716 1024 377
1.0 -1680. 1.0
* master (synced), # master (unsynced), + selected, - candidate, ~
configured
Thanks
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