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. The following command enables revert mode:
configure system central-frequency-clock revert trueconfigure system sync-if-timing revertIf 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. The following command turns off revert mode:
configure system central-frequency-clock revert falseconfigure system sync-if-timing no revert