To do…
Use the command…
Remarks
Specify a
symmetric-passive
peer for the switch
ntp-service
unicast-peer
{
remote-ip
|
peer-name
} [
authentication-keyid
key-id
|
priority
|
source-interface
Vlan-interface
vlan-id
|
version
number
]*
Required
By default, a switch is not
configured to work in the
symmetric mode.
z
In the symmetric peer mode, you need to execute the related NTP configuration commands (refer
to section
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.
z
The remote device specified by
remote-ip
or
peer-name
serves as the peer of the local Ethernet
switch, and the local switch works in the symmetric-active mode. In this case, the clock of the local
switch and that of the remote device can be synchronized to each other.
z
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 switch 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 switch.
Configuring NTP Broadcast Mode
For switches 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 switches working in the NTP broadcast client mode will respond to the NTP
messages, so as to start the clock synchronization.
A broadcast server can synchronize broadcast clients only after its clock has been synchronized.
Configuring a switch to work in the NTP broadcast server mode
Follow these steps to configure a switch to work in the NTP broadcast server mode:
To do…
Use the command…
Remarks
Enter system view
system-view
—
54-8
