Configuring The Ntp Symmetric Peers Mode - 3Com S7906E Configuration Manual

Configuring the NTP Symmetric Peers Mode

For devices working in the symmetric mode, you need to specify a symmetric-passive peer on a
symmetric-active peer.
Following these steps to configure a symmetric-active device:
To do...
Enter system view
Specify a symmetric-passive
peer for the device
In the symmetric mode, you should use the ntp-service refclock-master command or any NTP
configuration command in
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 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 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 the broadcast mode, you need to 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.
Use the command...
system-view
ntp-service unicast-peer
[ vpn-instance
vpn-instance-name ]
{ ip-address | peer-name }
[ authentication-keyid keyid |
priority | source-interface
interface-type interface-number
| version number ] *
Configuring the Operation Modes of NTP
1-9
Remarks
—
Required
No symmetric-passive peer is
specified by default.
to enable NTP; otherwise, a