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NE40E V800R010C10SPC500 Feature Description - Security 01

This is NE40E V800R010C10SPC500 Feature Description - Security
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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 Layer 2 Loop Detection

Overview of Layer 2 Loop Detection

Definition

Layer 2 loop detection is a security mechanism used to detect loops on a Layer 2 network. When a Layer 2 loop occurs, a large number of packets will be repeatedly sent to a router's CPU. The traffic burst overloads the CPU, causing normal protocol packets to fail to be sent to the CPU. As a result, normal services will be interrupted. Layer 2 loop detection determines whether a loop has occurred based on information about packets sent to the CPU. After detecting a loop, a router will take the configured responsive action. For example, the system may send a trap to the network management system (NMS) or shut down the interface where the loop has occurred.

Purpose

If Layer 2 loop detection is enabled, the system can rapidly locate the interface where a loop has occurred and send a trap or shut down the interface. This function minimizes service loss caused by Layer 2 loops.

Benefits

Layer 2 loop detection offers the following benefits to carriers:

  • Rapidly locates the interface where a loop occurs, improving the loop locating efficiency.
  • Sends a trap to the NMS after an existing or potential Layer 2 loop is detected so that effective measures can be taken to minimize service loss and prevent major network faults.
  • Shuts down the interface where a loop occurs, reducing the adverse impact on the device.
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Updated: 2019-01-03

Document ID: EDOC1100055047

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