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Enabling the reference manually specified on a
You must perform this task if a line
clock input port on a non-default MDC
has been specified as the clock
reference source. This task enables the
clock reference setting to take effect on
all MDCs.
Configuring clock reference selection
Enable automatic clock reference selection or manually select a clock reference.
When you specify the clock reference manually in an MDC environment, follow these restrictions and
guidelines:
•
If you are specifying a line clock as the reference, you must perform the task on the MDC that
contains the line clock input port.
•
If the MDC is not the default MDC, you must perform the task in "
Enabling the reference manually
specified on a non-default MDC
" for the setting to take effect.
To configure the clock reference selection mode:
Step Command
Remarks
1.
(Optional.) Verify that
the clock source you
want to select is in
Normal state.
display network-clock source
Skip this step if you are
enabling automatic reference
selection.
2.
Enter system view.
system-view
N/A
3.
Enable automatic
reference selection or
manually select a
reference.
•
In standalone mode:
network-clock work-mode
{
auto
|
manual
source
{
bits0
|
bits1
|
lpuport
port-type
port-number
} }
•
In IRF mode:
network-clock chassis
chassis-number
work-mode
{
auto
|
manual
source
{
bits0
|
bits1
} }
network-clock work-mode manual source
lpuport
port-type port-number
By default, automatic
reference selection is
enabled.
4.
(Optional.) Verify that
the configuration is
effective.
display network-clock status
It takes time for the clock
reference selection mode
change to take effect. To
verify the effectiveness of the
change, you can also check
the log in addition to use this
command.
Setting the Sa bit for the SSM of BITS clocks
Sa bits from Sa4 through Sa8 can be used to transmit the SSM quality level of BITS timing signal. You
must select one Sa bit as required by the network.