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Reversion Optional mechanism due to potential second hit during to the reversion switching operation Turn-on/-off (default behaviour settable per policy) either through signalling or policy Reversion operation uses exactly the same LSP as the one previously under failure (default behaviour) implies “testing” the LSP (using Admin_Status) before reversion switching uses the “bridge and switch” a.k.a “make-before-break” Keep possibility (e.g. policy or signalling) to clear out the resources on intermediate nodes if reversion switching not possible |