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CLI-based Configuration Guide - VPN

AR100, AR120, AR150, AR160, AR200, AR1200, AR2200, AR3200, and AR3600 V200R010

This document describes VPN features on the device and provides configuration procedures and configuration examples.
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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).
Loop Prevention

Loop Prevention

On an Ethernet network, the Spanning Tree Protocol (STP) is often enabled to prevent loops. However, VPLS users are not aware of the Internet Service Provider (ISP) network. Therefore, STP enabled on the private network cannot prevent loops on the ISP network. VPLS uses full-mesh PWs and split horizon to prevent loops.

  • The PEs in a VSI must be fully meshed. That is, a PE must create a tree to every other PE in the VSI.
  • Each PE must support split horizon to avoid loops. Split horizon requires that packets received from a PW in a VSI should not be forwarded to other PWs in the VSI. Any two PEs in a VSI must communicate over a direct PW, which is why full-mesh PWs are required between PEs in a VSI.

The full-mesh PEs and split horizon ensure route reachability and prevent loops on a VPLS network. When a CE is connected to multiple PEs, or CEs on the same VPLS VPN are interconnected, VPLS cannot avoid loops. In such a situation, other methods must be used to prevent loops.

STP can run on an L2VPN private network, and all STP Bridge Protocol Data Units (BPDUs) are transparently transmitted over the ISP network.

Updated: 2019-08-07

Document ID: EDOC1100033725

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