Huawei Quidway S9300 Configuration Manual page 188

Quidway S9300 Terabit Routing Switch
Configuration Guide - Device Management
Context
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Do as follows on the S9300 according to the receding description and actual situation.
Procedure
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Issue 03 (2011-12-29)
If the SSM quality level is used in clock source selection but the SSM quality level of a
clock source cannot be obtained, you can specify the SSM quality level of the clock source
by using the clock ssm-config command.
If the S1 byte of a clock source obtained from the system is 0, the system considers the
SSM quality level of the clock source as the unknown level. By default, the unknown level
maps the DNU level and the clock source of this level is not selected. You can use the
clock ql-unknown command to set the unknown level to a higher level so that the clock
source can participate in clock source selection.
When the BITS interface selects the clock source based on the SSM quality level:
– If the BITS clock works in bps mode, the BITS interface obtains the SSM quality level
from the received SSM message. If the SSM quality level can be obtained from the
system, you do not need to run the clock ql-unknown and clock ssm-config commands.
If the SSM quality level cannot be obtained, you can run the clock ql-unknown and
clock ssm-config commands to specify the SSM quality level.
– When the BITS clock works in 2 MHz mode, the clock does not have an SSM quality
level. If the SSM quality level needs to be used in clock source selection, run the clock
ssm-config command to set an SSM quality level for the clock.
Setting the SSM quality level of a clock source
1. Run:
system-view
The system view is displayed.
The default SSM quality level of the local clock source and system clock (19.44 MHz)
is SEC.
2. Run:
clock ssm-config { prc | ssu-t | ssu-l | sec | dnu } source source
The SSM quality level of a clock source is set.
Specifying the SSM quality level mapping the unknown quality level
1. Run:
system-view
The system view is displayed.
2. Run:
clock ql-unknown { prc | ssu-t | ssu-l | sec }
The SSM quality level mapping the unknown quality level is specified.
The default SSM quality level of the local clock source and system clock (19.44 MHz)
is SEC.
NOTE
This command is applicable to the clock source whose SSM value is 0. The S9300 considers
the SSM quality level of such a clock source as the value set in this command.
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11 Ethernet Clock Syntonization Configuration
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