H3C Technologies H3C S7500E Series Switches - Manual (Page 74)

3-10
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
[ vpn-instance
vpn-instance-name ]
{ 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.