Hitachi GR2000 Series Configuration Commands page 356

Hitachi Gigabit Router GR2000 Series Enhanced Version Configuration Commands, Vol. 2
If the IP address of the device is set by "config router local-address," the IP
address of the device is used as the local IP address when sending NTP packets.
Therefore, if the device is set as NTP server or peer, specify the IP address of the
device as the IP address. When adding, changing or deleting device IP addresses,
reinitialize the ntp program using the "restart ntp" command.
When using MPLS, the MPLS function stops when the time reverts by the NTP
function. In addition, the "copy running-config" command and changes in
configuration definitions will not operate properly. If this happens, reboot the
MPLS program using the "restart mpls" command. [ROUTE-OS7]
4-26 GR2K-GA-0014
Ver. 07-02