System Synchronization Commands
Page 364 7210 SAS D, E, K OS Basic System Configuration
Guide
ref-order
Syntax ref-order first second third
ref-order ptp
no ref-order
Context config>system>sync-if-timing
Description The synchronous equipment timing subsystem can lock to different timing reference inputs, those
specified in the ref1, ref2 and ptp command configuration. This command organizes the priority
order of the timing references.
If a reference source is disabled, then the clock from the next reference source as defined by ref-
order is used. If all reference sources are disabled, then clocking is derived from a local oscillator.
Note that if a sync-if-timing reference is linked to a source port that is operationally down, the port is
no longer qualified as a valid reference. Depending on the platform used, either SFP or Fixed copper
ports can be used as a reference.
The no form of the command resets the reference order to the default values.
Note: On 7210 SAS- D, ETR, Ref1 has to be configured to use one of the ports from 1/1/1 up to 1/1/
4 and ref2 should be configured to use either 1/1/5 or 1/1/6. The software enforces this check. The
ports 1/1/7 up to 1/1/10 can be configured as either ref1 or ref2.
Default 7210 SAS-D, E, K-ref1 ref2 ptp
Parameters first — Specifies the first timing reference to use in the reference order sequence.
second — Specifies the second timing reference to use in the reference order sequence.
third — Specifies the third timing reference to use in the reference order sequence. This parameter is
supported only on 7210 SAS-K devices.
ptp — Specifies that PTP must be used as a timing reference.
ref1
Syntax ref1
Context config>system>sync-if-timing
Description This command enables the context to configure parameters for the first timing reference.
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