Page 378 7450 ESS OS Basic System Configuration Guide
Syntax [no] revert
Context config>system>sync-if-timing
Description This command allows the clock to revert to a higher priority reference if the current reference goes offline or
becomes unstable. When the failed reference becomes operational, it is eligible for selection. When the
mode is non-revertive, a failed clock source is not selected again.
Default no revert
source-port
Syntax source-port port-id
no source-port
Context config>system>sync-if-timing>ref1
config>system>sync-if-timing>ref2
Description This command configures the source port for timing reference ref1 or ref2. If the port is unavailable or the
link is down, then the reference sources are re-evaluated according to the reference order configured in the
ref-order command.
The timing reference for ref1 and ref2 must be specified for ports in the following chassis slots:
Parameters port-id — Identify the physical port in the slot/mda/port format.
7450 Model Ref1/Slots Ref2/Slots
ESS-1
Not enabled Not enabled
ESS-6
1 — 2 3 — 4
ESS-7
1 — 2 3 — 5
ESS-12
1 — 5 6 — 10
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