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CX11x, CX31x, CX710 (Earlier Than V6.03), and CX91x Series Switch Modules V100R001C10 Configuration Guide 12

The documents describe the configuration of various services supported by the CX11x&CX31x&CX91x series switch modules The description covers configuration examples and function configurations.
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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).
Introduction to Loopback Detection

Introduction to Loopback Detection

Loopback detection sends loopback detection packets periodically to detect loops on the network connected to the device.

When a loop occurs on a network, broadcast, multicast, and unknown unicast packets are repeatedly transmitted on the network. This wastes network resources or even causes service interruption on the entire network. To protect the network, certain actions should be taken on the interface where the loop occurs, and the administrator needs to check the network connection and configuration to solve the problem soon. Therefore, a mechanism is required on a Layer 2 network to detect loops and notify the administrator.

Loopback detection is such a mechanism. It sends detection packets from an interface at intervals and checks whether the packets are sent back to the interface. If the packets are sent back, a loopback occurs on the interface.

Updated: 2019-08-09

Document ID: EDOC1000041694

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