Preservation of an Established LSP Label

Labels used for an established LSP are preserved through the graceful restart by means of the recovery_label object and the suggested_label object in the path messages. The recovery_label object conveys the incoming label of the restarting LSR that the restarting LSR passed to the upstream helper before the restart. The suggested_label object includes the outgoing label that the restarting LSR used before the restart. The suggested_label object conveys the outgoing label from the restarting LSR to its downstream neighbor.

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