EVPN EPL Link-Loss Forwarding

Overview

Link Loss Forwarding (LLF) is a fault propagation feature for EVPN Ethernet Private Line (EPL) services that ensures reliable point-to-point connections on physical interfaces. It prevents traffic blackholing by detecting remote service failures and bringing the local physical link operationally down, enabling the local end to trigger a traffic failover mechanism. LLF is supported on all Broadcom chipsets and uses Ethernet Auto-Discovery (AD) per EVI (RT-1) route withdrawal for fault propagation, which is enabled by default.

The feature can be configured per service using the CLI command llf enable in interface mode. By facilitating proactive fault handling, LLF ensures minimal downtime, improves service reliability, and enhances traffic management for customers relying on point-to-point connections.

Feature Characteristics

Link Loss Forwarding (LLF) enhances the reliability of EVPN Ethernet Private Line (EPL) connections by detecting remote failures, bringing the local link down to initiate failover, and preventing traffic blackholing. It ensures prompt communication of service interruptions to minimize downtime and prevent data loss.

Benefits

LLF enhances networking environments by ensuring minimal service downtime, reliable traffic failover, and increased network stability.

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Minimized Service Downtime: Quick detection and propagation of faults reduce recovery time.

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Traffic Failover Assurance: Reliable failover mechanisms are enabled, ensuring minimal impact on customer services.

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Improved Network Reliability: The proactive nature of LLF enhances the robustness of EVPN EPL services.