3com WX3000 Manuel D’Utilisation

 

1-8 

z 

In the symmetric peer mode, you need to execute the related NTP configuration commands (refer 

 for details) to enable NTP on a symmetric-passive peer; 

otherwise, the symmetric-passive peer will not process NTP messages from the symmetric-active 

peer. 

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The remote device specified by remote-ip or peer-name serves as the peer of the local device, and 

the local device works in the symmetric-active mode. In this case, the clock of the local device and 

that of the remote device can be synchronized to each other. 

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remote-ip must not be a broadcast address, a multicast address or the IP address of the local 

clock. 

z 

After you specify an interface for sending NTP messages through the source-interface keyword, 

the source IP address of the NTP message will be configured as the IP address of the specified 

interface. 

z 

Typically, the clock of at least one of the symmetric-active and symmetric-passive peers should be 

synchronized first; otherwise the clock synchronization will not proceed. 

z 

You can configure multiple symmetric-passive peers for the local device by repeating the 

ntp-service unicast-peer command. The clock of the peer with the smallest stratum will be 

chosen to synchronize with the local clock of the device. 

 

For devices working in the broadcast mode, you need to configure both the server and clients. The 

broadcast server periodically sends NTP broadcast messages to the broadcast address 

255.255.255.255. The devices working in the NTP broadcast client mode will respond to the NTP 

messages, so as to start the clock synchronization. 

The device can work as a broadcast server or a broadcast client. 

 

A broadcast server can synchronize broadcast clients only after its clock has been synchronized. 

 

Enter system view 

— 

Enter VLAN interface view 

interface Vlan-interface 
vlan-id 

— 

Configure the device to work in 
the NTP broadcast server 
mode  

ntp-service broadcast-server 
[ authentication-keyid key-id | 
version number ]* 

Required 

Not configured by default.