The revert 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 mode is non-revertive, a failed clock source is not selected again. If a node enters holdover because of the references being in previous failed state, then the node selects one of the previously failed references instead of going into holdover.
config>system>sync-if-timing
— revert
If the current reference goes offline or becomes unstable the revert command allows the clock to revert to a higher-priority reference.
When revertive switching enabled a valid timing reference of the highest priority is used. If a reference with a higher priority becomes valid, a reference switch over to that reference is initiated. If a failure on the current reference occurs, the next highest reference takes over.
If non-revertive switching is enabled, the valid active reference always remains selected even if a higher priority reference becomes available. If the active reference becomes invalid, a reference switch over to a valid reference with the highest priority is initiated. The failed reference is eligible for selection when it becomes operational.
config>system>sync-if-timing
— no revert