R3303-HP HSR6800 Routers Network Management and Monitoring Configuration Guide

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Figure 25 Network diagram
NTP configuration task list
Task Remarks
Configuring NTP operation modes Required.
Configuring the local clock as a reference source Optional.
Configuring optional parameters for NTP Optional.
Configuring access-control rights Optional.
Configuring NTP authentication Optional.
Configuring NTP operation modes
Devices can implement clock synchronization in one of the following modes:
• Client/server mode—Configure only clients.
• Symmetric mode—Configure only symmetric-active peers.
• Broadcast mode—Configure both clients and servers.
• Multicast mode—Configure both clients and servers.
Configuring NTP client/server mode
If you specify the source interface for NTP messages by specifying the source interface source-interface
option, NTP uses the primary IP address of the specified interface as the source IP address of the NTP
messages.
A device can act as a server to synchronize other devices only after it is synchronized. If a server has a
stratum level higher than or equal to a client, the client does not synchronize to that server.
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.
To specify an NTP server on the client: