H3C Technologies H3C WX3000 Series Unified Switches - Manual (Page 457)

46-6
NTP Configuration Task List
Complete the following tasks to configure NTP:
Task Remarks
Configuring NTP Implementation Modes Required
Configuring Access Control Right Optional
Configuring NTP Authentication Optional
Configuring Optional NTP Parameters Optional
Displaying and Maintaining NTP Configuration Optional
Configuring NTP Implementation Modes
The device can work in one of the following NTP modes:
z
Configuring NTP Server/Client Mode
z
Configuring the NTP Symmetric Peer Mode
z
Configuring NTP Broadcast Mode
z
Configuring NTP Multicast Mode
To protect unused sockets against attacks by malicious users and improve security, the device provides
the following functions:
z
UDP port 123 is opened only when the NTP feature is enabled.
z
UDP port 123 is closed as the NTP feature is disabled.
These functions are implemented as follows:
z
Execution of one of the ntp-service unicast-server, ntp-service unicast-peer, ntp-service
broadcast-client , ntp-service broadcast-server, ntp-service multicast-client, and ntp-service
multicast-server commands enables the NTP feature and opens UDP port 123 at the same time.
z
Execution of the undo form of one of the above six commands disables all implementation modes
of the NTP feature and closes UDP port 123 at the same time.
Configuring NTP Server/Client Mode
For devices working in the server/client mode, you only need to perform configurations on the clients,
and not on the servers.
Follow these steps to configure an NTP client: