NTP problem

[b.withrow]

I am trying to get NTP working. It runs fine on the devices that are on the same subnet as teh TIME SEVER, but devices on the management VLAN are not working. Although I can ping the time server from the router on the MGT Vlan. Here is the output of debug ntp packets for the router that is not working correctly:

*Mar 17 04:48:21.892 CST: NTP: xmit packet to 171.30.12.1:

*Mar 17 04:48:21.892 CST: leap 3, mode 3, version 3, stratum 0, ppoll 64

*Mar 17 04:48:21.892 CST: rtdel 0000 (0.000), rtdsp 10001 (1000.015), refid 00000000 (0.0

.0.0)

*Mar 17 04:48:21.892 CST: ref 00000000.00000000 (18:00:00.000 CST Thu Dec 31 1899)

*Mar 17 04:48:21.892 CST: org 00000000.00000000 (18:00:00.000 CST Thu Dec 31 1899)

*Mar 17 04:48:21.892 CST: rec 00000000.00000000 (18:00:00.000 CST Thu Dec 31 1899)

*Mar 17 04:48:21.892 CST: xmt BE5DBF75.E45C1C18 (04:48:21.892 CST Sat Mar 17 2001)

[lgijssel]

Have you configured an ntp source-interface?

Depending on your network topology some IP's might not be reachable.

For myself, I always use a loopback interface as ntp-source.

[b.withrow]

Thanks for the input. What do you mean you use a LOOPBACK for NTP? Could you give me an example? Thanks!