3com 5500G ユーザーズマニュアル

Defined in RFC 1305, the Network Time Protocol (NTP) synchronizes timekeeping 
among distributed time servers and clients. NTP runs over the User Datagram 
Protocol (UDP), using UDP port 123.

The purpose of using NTP is to keep consistent timekeeping among all 
clock-dependent devices within the network so that the devices can provide 
diverse applications based on the consistent time.

For a local system running NTP, its time can be synchronized by other reference 
sources and can be used as a reference source to synchronize other clocks.

Figure 82   Network diagram for NTP client/server mode configuration

 

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The local clock of Device A (switch) is to be used as a reference source, with the 
stratum level of 2.

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Device B is a Switch 5500, which takes Device A as the time server.

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Set Device B to work in the client mode, and Device A will automatically work 
in the server mode.

# Set Device B to take Device A as the time server.

<DeviceB> system-view

[DeviceB] ntp-service unicast-server 1.0.1.11 

# View NTP status of Device B.

[DeviceB] display ntp-service status 

# View NTP session information of Device B.

1.0.1.11/24

1 .0.1.12/24

Device A

Device B

Switch 5500

Release V03.02.04 

All versions

Switch 5500G

Release V03.02.04 

All versions

Switch 4500

Release V03.03.00 

All versions

Switch 4210

Release V03.01.00 

All versions