148
•
If the SSM quality level contributes to the selection process, the network clock monitoring module
selects a reference from available clock sources by their SSM quality level and priority.
•
If the SSM quality level does not contribute to the selection process, the network clock monitoring
module selects a reference from available clock sources only by their priority.
In an MDC environment, you must perform this task on the default MDC. However, the setting takes effect
on all MDCs.
To control the contribution of the SSM quality level to automatic reference selection:
Step Command
Remarks
1.
Enter system view.
system-view
N/A
2.
Configure the use of
SSM quality level in
automatic reference
selection.
•
In standalone mode:
network-clock ssmcontrol
{
on
|
off
}
•
In IRF mode:
network-clock chassis
chassis-number
ssmcontrol
{
on
|
off
}
By default, SSM quality level is
ignored in the automatic reference
selection process.
Setting the priority of a clock source
In an automatic reference selection process, the network clock monitoring module selects the optimal
clock as a reference from all available clock sources.
The lower the priority value, the better the clock source.
For the BITS clocks and PTP, you must perform this task on the default MDC. For a line clock, you must
perform this task on the MDC that contains the clock input port.
To set the priority of a clock source:
Step Command
Remarks
1.
Enter system view.
system-view
N/A
2.
Set the priority of a
clock source.
•
In standalone mode:
network-clock source
{
bits0
|
bits1
|
ptp
|
lpuport
port-type port-number
}
priority
value
•
In IRF mode:
{
network-clock chassis
chassis-number
source
{
bits0
|
bits1
|
ptp
}
priority
value
{
network-clock source lpuport
port-type
port-number
priority
value
By default, all clock sources
have a priority of 255.
Enabling the reference manually specified on a
non-default MDC
If you specify a line clock as the reference on a non-default MDC, you must perform this task on the
default MDC to enable the reference setting for all MDCs.
To enable the reference manually specified on a non-default MDC: