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Table of Contents
1 NTP Configuration·····································································································································1-1
NTP Overview·········································································································································1-1
Applications of NTP·························································································································1-1
Advantages of NTP ·························································································································1-1
How NTP Works······························································································································1-2
NTP Message Format ·····················································································································1-3
Operation Modes of NTP·················································································································1-4
NTP Configuration Task List···················································································································1-6
Configuring the Operation Modes of NTP·······························································································1-7
Configuring NTP Client/Server Mode······························································································1-7
Configuring the NTP Symmetric Peers Mode ·················································································1-8
Configuring NTP Broadcast Mode···································································································1-9
Configuring NTP Multicast Mode·····································································································1-9
Configuring Optional Parameters of NTP ·····························································································1-10
Specifying the Source Interface for NTP Messages ·····································································1-10
Disabling an Interface from Receiving NTP Messages·································································1-11
Configuring the Maximum Number of Dynamic Sessions Allowed···············································1-11
Configuring Access-Control Rights·······································································································1-12
Configuration Prerequisites···········································································································1-12
Configuration Procedure················································································································1-12
Configuring NTP Authentication············································································································1-13
Configuration Prerequisites···········································································································1-13
Configuration Procedure················································································································1-13
Displaying and Maintaining NTP···········································································································1-15
NTP Configuration Examples················································································································1-15
Configuring NTP Client/Server Mode····························································································1-15
Configuring the NTP Symmetric Mode··························································································1-16
Configuring NTP Broadcast Mode·································································································1-18
Configuring NTP Multicast Mode···································································································1-19
Configuring NTP Client/Server Mode with Authentication·····························································1-23
Configuring NTP Broadcast Mode with Authentication ·································································1-24
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