3Com MSR 50 Series Configuration Manual page 2057

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Configuring NTP The broadcast server periodically sends NTP broadcast messages to the broadcast
Broadcast Mode address 255.255.255.255. After receiving the messages, the device working in
NTP broadcast mode sends a reply and synchronizes its local clock.
For devices working in the broadcast mode, you need to configure both the server
and clients. Because an interface need 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
Follow these steps to configure an NTP broadcast client:
To do...
Enter system view
Enter interface view
Configure the device to work
in the NTP broadcast client
mode
Configuring the broadcast server
Follow these steps to configure the NTP broadcast server:
To do...
Enter system view
Enter interface view
Configure the device to work
in the NTP broadcast server
mode
n
A broadcast server can synchronize broadcast clients only after its clock has been
synchronized.
Modes of NTP" on page 2055
peer will not process NTP packets from a symmetric-active peer.
In the ntp-service unicast-peer command, ip-address must be a host
address, rather than a broadcast address, a multicast address or the IP address
of the local clock.
When the interface used to send NTP messages is specified by the
source-interface argument, the source IP address of the NTP message will be
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 the Operation Modes of NTP
to enable NTP; otherwise, a symmetric-passive
Use the command...
system-view
interface interface-type
interface-number
ntp-service
broadcast-client
Use the command...
system-view
interface interface-type
interface-number
ntp-service
broadcast-server
[ authentication-keyid keyid
| version number ] *
2057
Remarks
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Enter the interface used to
receive NTP broadcast
messages
Required
Remarks
-
Enter the interface used to
send NTP broadcast messages
Required