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Feature Description - VPN 01

NE05E and NE08E V300R003C10SPC500

This is NE05E and NE08E V300R003C10SPC500 Feature Description - VPN
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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).
Auto Loop Detection

Auto Loop Detection

Basic Concepts

Auto loop detection monitors whether loops exist on L2VPNs and reports alarms if loops are detected.

Implementation Methods

Auto loop detection can be implemented in rapid or slow mode. The two modes are independent of each other and can be both implemented.

  1. Rapid detection: The device sends 150 detection packets per second to detect interfaces that change from Down to Up, interfaces bound to services, and interfaces that have caused loops.

  2. Slow detection: The device sends 50 detection packets per second to detect all interfaces not covered in rapid detection.

Alarms are reported when loops are detected in either rapid or slow detection.

Alarm reporting conditions are as follows:

  1. If physical Ethernet main interfaces are not bound to L2VPN services, an alarm is reported only when an interface sends packets to the interface itself.

  2. If interfaces are bound to L2VPN services, alarms are reported by both AC-side interfaces when one AC-side interface sends packets to the other AC-side interface residing on the same device.

  3. If interfaces are bound to L2VPN services, an alarm is reported by an AC-side interfaces when the AC-side interface sends packets to a PW-side interface residing on the same device.

NOTE:

When no loop is detected on the live network, check whether a network device sends auto loop detection packets and then receives them by itself based on the alarm triggering conditions. If the device both sends and receives the packets, disabling auto loop detection is recommended to prevent a false loop alarm.

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Updated: 2019-01-14

Document ID: EDOC1100058940

Views: 12794

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