Revert Timer for Revertive Switchover for LDP Pseudowires

Overview

The Virtual Circuit (VC) Reversion functionality, along with an associated Revert Timer, enhances traffic convergence and service stability in OcNOS LDP-based Layer 2 VPN deployments. It ensures that in dual-homing or redundant configurations, the Primary VC is automatically restored and preferred once it becomes available after a fault condition is resolved.

Characteristics

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VC reversion operates only in Primary/Secondary VC configurations. In case of a fault on the Attachment Circuit (AC) or Packet Switched Network (PSN), the system may bring down either or both VCs. Once the fault is resolved, the Primary VC will automatically revert to the active state.

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For VPWS deployments, a revert timer has been introduced to allow controlled, delayed reactivation of the Primary VC after recovery.

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For VPLS and H-VPLS topologies, VC reversion functionality has been newly added, including support for the revert timer mechanism.

Benefits

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Ensures deterministic traffic recovery by prioritizing the Primary VC when restored.

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Minimizes traffic blackholing during transient network recovery events.

Prerequisites

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Applicable only to LDP-based VPWS and VPLS/H-VPLS services.

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Requires Primary/Secondary VC configuration for reversion logic to apply.