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Table of Contents 
1 NTP Configuration·····································································································································1-1 
Introduction to NTP·································································································································1-1 
Applications of NTP·························································································································1-1 
Implementation Principle of NTP·····································································································1-2 
NTP Implementation Modes············································································································1-3 
NTP Configuration Tasks························································································································1-5 
Configuring NTP Implementation Modes································································································1-5 
Configuring NTP Server/Client Mode······························································································1-6 
Configuring the NTP Symmetric Peer Mode···················································································1-6 
Configuring NTP Broadcast Mode···································································································1-7 
Configuring NTP Multicast Mode·····································································································1-8 
Configuring Access Control Right···········································································································1-9 
Configuration Prerequisites···········································································································1-10 
Configuration Procedure················································································································1-10 
Configuring NTP Authentication············································································································1-10 
Configuration Prerequisites···········································································································1-11 
Configuration Procedure················································································································1-11 
Configuring Optional NTP Parameters ·································································································1-13 
Configuring an Interface on the Local Switch to Send NTP messages ········································1-13 
Configuring the Number of Dynamic Sessions Allowed on the Local Switch ·······························1-13 
Disabling an Interface from Receiving NTP messages·································································1-14 
Displaying NTP Configuration···············································································································1-14 
Configuration Example··························································································································1-14 
Configuring NTP Server/Client Mode····························································································1-14 
Configuring NTP Symmetric Peer Mode ·······················································································1-16 
Configuring NTP Broadcast Mode·································································································1-17 
Configuring NTP Multicast Mode···································································································1-19 
Configuring NTP Server/Client Mode with Authentication·····························································1-20