H3C Technologies H3C S7500E Series Switches - Manual (Page 78)

3-14
z Typically, the stratum level of the NTP server which is synchronized from an authoritative
clock (such as an atomic clock) is set to 1. This NTP server operates as the primary
reference source on the network; and other devices synchronize themselves to it. The
synchronization distances between the primary reference source and other devices on the
network, namely, the number of NTP servers on the NTP synchronization paths, determine
the clock stratum levels of the devices.
z After you have configured the local clock as a reference clock, the local device can act as a
reference clock to synchronize other devices in the network. Therefore, perform this
configuration with caution to avoid clock errors of the devices in the network.
z In this command, ip-address must be 127.127.1.u, where u ranges 0 to 3, representing the
NTP process ID.
Configuring Optional Parameters of NTP
Specifying the Source Interface for NTP Messages
If you specify the source interface for NTP messages, the device sets the source IP address of
the NTP messages as the primary IP address of the specified interface when sending the NTP
messages.
When the device responds to an NTP request received, the source IP address of the NTP
response is always the IP address of the interface that received the NTP request.
Following these steps to specify the source interface for NTP messages:
To do… Use the command… Remarks
Enter system view system-view —
Specify the source interface for
NTP messages
ntp-service source-interface
interface-type interface-number
Required
By default, no source interface
is specified for NTP messages,
and the system uses the IP
address of the interface
determined by the matching
route as the source IP address
of NTP messages.