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Configuration Guide - MPLS

S7700 and S9700 V200R011C10

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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Configuring Dynamic BFD to Monitor a BGP Tunnel

Configuring Dynamic BFD to Monitor a BGP Tunnel


BFD for BGP tunnel rapidly detects faults in E2E BGP tunnels.

On an IP/MPLS network transmitting VPN services, PEs establish a multi-segment MPLS tunnel between each other. Therefore VPN services are sent to multiple PEs. In this case, VPN service provision on PEs becomes complex, and the VPN service scalability decreases. As PEs establish BGP peer relationships, a routing policy can be used to assign MPLS labels for BGP routes so that an E2E BGP tunnel can be established. The BGP tunnel consists of a primary BGP LSP and a backup BGP LSP. VPN services can travel along the E2E BGP tunnel, which simplifies service provision and improves VPN service scalability.

To rapidly detect faults in an E2E BGP tunnel, BFD for BGP tunnel is used. BFD for BGP tunnel establishes a dynamic BFD session, also called a BGP BFD session, which is bound to both the primary and backup BGP LSPs. If both BGP LSPs fail, the BGP BFD session detects the faults and triggers VPN FRR switching.

Pre-configuration Tasks

Before configuring dynamic BFD to monitor a BGP tunnel, configure basic MPLS functions.

Configuration Procedure

Configure dynamic BFD to monitor a BGP tunnel according to the following sequence.

Updated: 2019-10-18

Document ID: EDOC1000178315

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