3
•
Slave
—The port uses the timing signal received from the peer end. For the network clock
monitoring module to extract timing signal from a port, you must place the port in slave clock
mode. If the port is in master clock mode, the module does not extract the timing signal from
the incoming traffic on the port.
Network synchronization tasks at a glance
To configure network synchronization, perform the following tasks:
1.
Configuring clock reference selection
Enable automatic clock reference selection or manually select a clock reference.
2.
(Optional.)
a.
Setting an Sa bit for the SSM of BITS clocks
b.
Setting the frequency of a BITS clock
3.
(Optional.)
Specifying a line clock input port
4.
(Optional.)
Configuring automatic reference selection parameters
{
Configuring the method for setting the SSM quality level of a clock source
{
Specifying an SSM quality level for a clock source
{
Controlling the use of SSM in automatic reference selection
{
Setting a priority for a clock source
Configuring clock reference selection
Restrictions and guidelines
To use the timing signal from an interface as the synchronization reference, you must also specify
the interface as a line clock input port by using the
network-clock lpuport
command.
If manual reference selection is used, the SSM levels and priorities configured for the clock sources
do not take effect.
Procedure
1.
(Optional.) Verify that the clock source you want to select is in Normal state.
display network-clock source
Skip this step if you use automatic reference selection.
2.
Enter system view.
system-view
3.
Enable automatic reference selection or manually select a reference.
In standalone mode:
network-clock work-mode
{
auto
|
manual
source
{
bits0
|
bits1
|
lpuport
interface-type interface-number
}
}
In IRF mode:
network-clock chassis chassis-number
work-mode
{
auto
|
manual source
{
bits0
|
bits
1
}
}
network-clock work-mode manual source lpuport
interface-type
interface-number
By default, automatic reference selection is enabled.
4.
(Optional.) Display the operating state of the network clock monitoring module.
display network-clock status
