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Configuration Guide - MPLS

S7700 and S9700 V200R010C00

This document describes MPLS configurations supported by the switch, including the principle and configuration procedures of static LSPs, MPLS LDP, MPLS TE, MPLS QoS, MPLS OAM, Seamless MPLS, and MPLS common features, and provides configuration examples.
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Protection Switching

Protection Switching

MPLS OAM protection switching enables one tunnel to protect one or multiple tunnels. Protection refers to setting the bypass tunnel as the protection tunnel for the primary tunnel and assigning it with bandwidth. The primary tunnel and the bypass tunnel then form a protection group. Working tunnels in the same protection group use the same ingress and egress.

When faults occur on the primary tunnel, data traffic can be quickly switched to the bypass tunnel. This decreases the packet loss ratio, shortens the delay due to the LSP failure, and enhances reliability of networks. Protection switching is end-to-end protection.

When using MPLS OAM for fast fault detection, the protection switching process can be performed in milliseconds.

On Huawei devices, protection switching can be performed in 1:1 mode or N:1 mode.

  • In 1:1 mode, a primary tunnel and a bypass tunnel are set up between the ingress and egress.

    • Data is normally transmitted through the primary tunnel.

    • When MPLS OAM on the ingress detects a fault on the primary tunnel, protection switching is performed and the ingress switches data transmission to the bypass tunnel.

  • In N:1 mode, one tunnel functions as the bypass tunnel for multiple primary tunnels. When any primary tunnel fails, data transmission is switched to the shared bypass tunnel. The N:1 mode is used to save bandwidth on a mesh network.

Figure 6-2  MPLS OAM protection switching

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Updated: 2019-04-18

Document ID: EDOC1000141902

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