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HP 4500G Family Configuration Manual: Configuring The Ntp Symmetric Peers Mode

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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.
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.
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.
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...
Enter system view
Specify a symmetric-passive
peer for the device
In the symmetric mode, you should use any NTP configuration command in
Operation Modes of NTP
NTP messages from a symmetric-active peer.
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.
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.
Typically, at least one of the symmetric-active and symmetric-passive peers has been
synchronized; otherwise the clock synchronization will not proceed.
You can configure multiple symmetric-passive peers by repeating the ntp-service unicast-peer
command.
Use the command...
system-view
ntp-service unicast-peer
{ ip-address | peer-name }
[ authentication-keyid keyid |
priority | source-interface
interface-type interface-number
| version number ] *
to enable NTP; otherwise, a symmetric-passive peer will not process
1-9
Remarks
Required
No symmetric-passive peer is
specified by default.
Configuring the

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