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CLI-based Configuration Guide - Network Management and Monitoring

AR100, AR120, AR150, AR160, AR200, AR1200, AR2200, AR3200, and AR3600 V200R009

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Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
Overview of LSDP

Overview of LSDP

This section describes the concept and function of LSDP.


The Link Status Detection Protocol (LSDP) detects link connectivity and sets interface status to Up or Down based on the link status.


The Ethernet does not have a link negotiation or detection mechanism. If an interface on a link is Down or a fiber encounters a unidirectional communication failure, the devices on two ends of the link or fiber cannot detect the fault. As a result, the devices consider that the related interfaces are Up and still forwards packets to the failure link, causing the packets to be discarded.

To improve service quality, the devices on the Ethernet must be able to:

  • Detect link connectivity.
  • Take actions based on link the status.

To meet the preceding requirements, the devices must use dedicated probe and have association mechanisms configured. This increases investment on network devices. Using Huawei LSDP, the devices do not need to use dedicated probe or association mechanisms, which reduce costs. LSDP can detect link connectivity and accurately take actions based on the link status. When a link fails, LSDP sets the interface status to Down, making the route to this interface and related forwarding entries invalid. When detecting that the link is recovered, LSDP changes the interface status to Up, and the interface can process services.

Updated: 2019-05-17

Document ID: EDOC1000174072

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