H3C Technologies H3C SecPath F1000-E - Manual (Page 121)

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NOTE:
•
In symmetric mode, use the ntp-service refclock-master command or any NTP configuration command in
Configuring the Operation Modes of NTP to enable NTP; otherwise, a symmetric-passive peer will not
process NTP messages from a symmetric-active peer.
• In the ntp-service unicast-peer command, ip-address must be a unicast address, rather than a broadcast
address, a multicast address or the IP address of the local clock.
•
When the source interface for NTP messages is specified by the source-interface argument,
the source IP address of the NTP messages is configured as the primary IP address of the
specified interface.
• Typically, at least one of the symmetric-active and symmetric-passive peers has been synchronized;
otherwise the clock synchronization will not proceed.
• You can configure multiple symmetric-passive peers by repeating the ntp-service unicast-peer
command.
Configuring NTP Broadcast Mode
The broadcast server periodically sends NTP broadcast messages to the broadcast address
255.255.255.255. After receiving the messages, the device working in NTP broadcast client mode
sends a reply and synchronizes its local clock.
For devices working in broadcast mode, configure both the server and clients. Because an interface
needs to be specified on the broadcast server for sending NTP broadcast messages and an interface
also needs to be specified on each broadcast client for receiving broadcast messages, the NTP
broadcast mode can be configured only in the specific interface view.
Configuring a broadcast client
To do… Use the command… Remarks
Enter system view system-view —
Enter interface view
interface interface-type
interface-number
Required
Enter the interface used to receive
NTP broadcast messages.
Configure the device to work in
NTP broadcast client mode
ntp-service broadcast-client Required
Configuring the broadcast server
To do… Use the command… Remarks
Enter system view system-view —
Enter interface view
interface interface-type
interface-number Enter the interface used to send
NTP broadcast messages.
Configure the device to work in
NTP broadcast server mode
ntp-service broadcast-server
[ authentication-keyid keyid |
version number ] *
Required