3Com WX3000 Configuring NTP Broadcast Mode, Configure the device to work, NTP broadcast server

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

The remote device specified by remote-ipor peer-nameserves 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.

remote-ipmust not be a broadcast address, a multicast address or the IP address of the local clock.

After you specify an interface for sending NTP messages through the source-interfacekeyword, the source IP address of the NTP message will be configured as the IP address of the specified interface.

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.

You can configure multiple symmetric-passive peers for the local device by repeating the ntp-serviceunicast-peercommand. The clock of the peer with the smallest stratum will be chosen to synchronize with the local clock of the device.

Configuring NTP Broadcast Mode

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.

Configuring the device to work in the NTP broadcast server mode

To do…		Use the command…	Remarks
Enter system view		system-view	—
Enter VLAN interface view		interface Vlan-interface	—
		vlan-id
Configure the device to work in		ntp-service broadcast-server	Required
the NTP broadcast server	[ authentication-keyid key-id		Not configured by default.
mode		version number ]*

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