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Configuration Guide - VPN

S1720, S2700, S5700, and S6720 V200R010C00

This document describes the VPN configuration procedures and provides 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, Spanning Tree Protocol (STP) is often used to prevent loops. However, VPLS users do not know the topology of the Internet Service Provider (ISP) network. Therefore, enabling STP on the private network cannot prevent loops on the ISP network. VPLS uses full-mesh PWs and split horizon to prevent loops.

  • PEs in a VSI must be fully meshed. This means that each PE must create a tree to every other PE in the VSI.
  • All PEs must support split horizon to avoid loops. Split horizon requires that packets sent on a PW in a VSI should not be forwarded over other PWs in the VSI. Any two PEs in a VSI must communicate directly over a single PW, without data being forwarded through an intermediary device. This 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 VPLS networks. If a CE is connected to multiple PEs, or multiple CEs on the same VPLS VPN are interconnected, VPLS cannot guarantee loop prevention. In this situation, other methods must be used to prevent loops.

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

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Updated: 2019-08-21

Document ID: EDOC1000141944

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