Configuring Optional Parameters Of Ntp; Specifying The Source Interface For Ntp Messages - 3Com S7906E Configuration Manual

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.
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.
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...
Enter system view
Specify the source interface for
NTP messages
If you have specified the source interface for NTP messages in the ntp-service unicast-server or
ntp-service unicast-peer command, the interface specified in the ntp-service unicast-server or
ntp-service unicast-peer command serves as the source interface of NTP messages.
If you have configured the ntp-service broadcast-server or ntp-service multicast-server
command, the source interface of the broadcast or multicast NTP messages is the interface
configured with the respective command.
Use the command...
system-view
ntp-service source-interface
interface-type interface-number
1-12
Remarks
—
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.