From: sony darrel (sonydarrel@gmail.com)
Date: Thu Mar 12 2009 - 13:15:49 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 stratum 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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