H3C S5120-SI Series

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Table of Contents
1 NTP Configuration·····································································································································1-1
NTP Overview·········································································································································1-1
Applications of NTP·························································································································1-1
Advantages of NTP ·························································································································1-2
How NTP Works······························································································································1-2
NTP Message Format ·····················································································································1-3
Operation Modes of NTP·················································································································1-5
NTP Configuration Task List···················································································································1-7
Configuring the Operation Modes of NTP·······························································································1-7
Configuring NTP Client/Server Mode······························································································1-8
Configuring the NTP Symmetric Peers Mode ·················································································1-9
Configuring NTP Broadcast Mode·································································································1-10
Configuring NTP Multicast Mode···································································································1-10
Configuring Optional Parameters of NTP ·····························································································1-11
Specifying the Source Interface for NTP Messages ·····································································1-11
Disabling an Interface from Receiving NTP Messages·································································1-12
Configuring the Maximum Number of Dynamic Sessions Allowed···············································1-12
Configuring Access-Control Rights·······································································································1-13
Configuration Prerequisites···········································································································1-13
Configuration Procedure················································································································1-13
Configuring NTP Authentication············································································································1-14
Configuration Prerequisites···········································································································1-14
Configuration Procedure················································································································1-14
Displaying and Maintaining NTP···········································································································1-16
NTP Configuration Examples················································································································1-16
Configuring NTP Client/Server Mode····························································································1-16
Configuring the NTP Symmetric Mode··························································································1-17
Configuring NTP Broadcast Mode·································································································1-19
Configuring NTP Multicast Mode···································································································1-21
Configuring NTP Client/Server Mode with Authentication·····························································1-23
Configuring NTP Broadcast Mode with Authentication ·································································1-25