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Configuration Guide - VPN

S7700 and S9700 V200R013C00

This document describes the configurations of VPN, including GRE, IPSec, BGP/MPLS IP VPN, BGP/MPLS IPv6 VPN, VLL, PWE3, VPLS, L2VPN Access to L3VPN.
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Summary of PWE3 Configuration Tasks

Summary of PWE3 Configuration Tasks

When configuring PWE3, you can configure static PW, dynamic PW, or PW switching. If a network spans multiple autonomous systems (ASs), you need to configure inter-AS PWE3. When a reliability solution is required, you also need to perform other configurations, such as Bidirectional Forwarding Detection (BFD) for PW and PWE3 fast reroute (FRR).

Table 6-1  PWE3 configuration tasks




Configure PWE3

When configuring PWE3, you can configure static PW, dynamic PW, or PW switching. The application scenario of each is as follows:

  • Configuring static PW: does not require signaling negotiation or exchange of control packets; therefore, it consumes few resources and is easy to configure. However, it requires manual configuration, which makes network maintenance and expansion difficult. Static PW applies to small-scale MPLS networks with simple topologies.

  • Configuring dynamic PW: applies to large-scale enterprises or local area networks (LANs) of small-scale carriers.

  • Configuring PW switching: PW labels need to be exchanged during multi-segment PW forwarding.

    PW switching applies to the following scenarios:

    • Two PEs are not in the same AS, and no signaling connection or tunnel can be set up between the two PEs. (If the labeled BGP route is used to set up an inter-AS tunnel, a multi-segment PW is not required.)

    • The signaling of two PEs differs from each other.

    • If the access device supports MPLS, but is incapable of setting up a large number of LDP sessions, you can use User Facing Provider Edge (UFPE) as the UPE. In addition, you can use the SPE as the switching node of LDP sessions, which is similar to a signaling reflector.

Configure inter-AS PWE3

Configure inter-AS PWE3 if the PWE3 backbone network spans multiple ASs.

Configuring Inter-AS PWE3

Configure PWE3 reliability

When you transmit key services over the PWE3 network, the following reliability solutions can be used:

  • Configuring BFD for PW: BFD for PW can rapidly detect a fault on the PW and notify the forwarding plane of the fault, ensuring fast traffic switchover.

  • Configuring PWE3 FRR: PWE3 FRR ensures link-layer reliability for the PWE3 network.

Configure and apply a tunnel policy

This task is required when PWE3 services need to be transmitted over TE tunnels or when multiple tunnels need to perform load balancing to fully use network resources.

Configuring and Applying a Tunnel Policy

Updated: 2019-04-08

Document ID: EDOC1100065751

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