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NE40E V800R010C10SPC500 Feature Description - Security 01

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

Overview of Layer 2 Loop Detection


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.


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.


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.
Updated: 2019-01-03

Document ID: EDOC1100055047

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