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Configuration Guide - VPN 01

NE05E and NE08E V300R003C10SPC500

This is NE05E and NE08E V300R003C10SPC500 Configuration Guide - VPN
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Loop detection can detect and eliminate loops, preventing broadcast storms.


Generally, redundant links are used on an Ethernet switching network to provide link backup for higher network reliability. The use of redundant links, however, may produce loops, causing broadcast storms and MAC table instability. As a result, the communication quality may deteriorate and services may even be interrupted.

As Layer 2 Ethernet technologies, L2VPN technologies, including virtual private LAN service (VPLS) and virtual leased line (VLL), also encounter loop problems in practical application:
  • If a customer network uses multiple leased lines, loops may accidentally occur due to reasons such as incorrect network configurations, resulting in broadcast storms.
  • If a customer network passes through a third-party network, loops may accidentally occur due to reasons such as incorrect third-party network configurations, resulting in broadcast storms.

To prevent loops on Ethernet switching networks, the Spanning Tree Protocol (STP) is used. However, if STP is used to prevent L2VPN loops, varying and complex customer networks will pose great network maintenance difficulties to carriers. This is because STP also needs to be deployed on CEs and relies on the customer network to some extent.

To address this issue, auto loop detection is introduced.


Loop detection offers the following benefits to carriers:
  • Reduced device burdens: auto loop detection effectively prevents broadcast storms, reducing device burdens.
  • Flexible and controllable deployment: auto loop detection only needs to be deployed on PEs and is totally independent of the customer network. Therefore, auto loop detection can be deployed in a flexible and controllable manner.
Updated: 2019-01-14

Document ID: EDOC1100058925

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