H3C S5120-EI Series, Operation Manual

Page: 1120 / 1191

1-9
z
In the
ntp-service unicast-server
command,
ip-address
must be a unicast address, rather than a
broadcast address, a multicast address or the IP address of the local clock.
z
When the source interface for NTP messages is specified by the
source-interface
argument, the
source IP address of the NTP messages will be configured as the primary IP address of the
specified interface.
z
A device can act as a server to synchronize the clock of other devices only after its clock has been
synchronized. If the clock of a server has a stratum level higher than or equal to that of a client’s
clock, the client will not synchronize its clock to the server’s.
z
You can configure multiple servers by repeating the
ntp-service unicast-server
command. The
clients will choose the optimal reference source.
Configuring the NTP Symmetric Peers Mode
For devices working in the symmetric mode, you need to specify a symmetric-passive peer on a
symmetric-active peer.
Following these steps to configure a symmetric-active device:
To do… Use the command… Remarks
Enter system view
system-view
—
Specify a symmetric-passive
peer for the device
ntp-service unicast-peer
{
ip-address
|
peer-name
}
[
authentication-keyid keyid
|
priority
|
source-interface
interface-type interface-number
|
version number
] *
Required
No symmetric-passive peer is
specified by default.
z
In the symmetric mode, you should use any NTP configuration command in Configuring the
Operation Modes of NTP to enable NTP; otherwise, a symmetric-passive peer will not process
NTP messages from a symmetric-active peer.
z
In the
ntp-service unicast-peer
command,
ip-address
must be a unicast address, rather than a
broadcast address, a multicast address or the IP address of the local clock.
z
When the source interface for NTP messages is specified by the
source-interface
argument, the
source IP address of the NTP messages will be configured as the primary IP address of the
specified interface.
z
Typically, at least one of the symmetric-active and symmetric-passive peers has been
synchronized; otherwise the clock synchronization will not proceed.
z
You can configure multiple symmetric-passive peers by repeating the
ntp-service unicast-peer
command.