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Configuration Guide - VPN

CloudEngine 12800 and 12800E V200R005C10

This document describes the configurations of VPN, including GRE, BGP/MPLS IP VPN, BGP/MPLS IPv6 VPN, VLL, PWE3, and VPLS.
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Configuring Inter-AS VPN Option B

Configuring Inter-AS VPN Option B

If virtual private network (VPN) routes need to be established over a Multiprotocol Label Switching (MPLS) backbone network spanning multiple autonomous areas (ASs), inter-AS VPN is required. If the provider edge (PE) devices connect to many VPNs but the autonomous area border routers (ASBRs) do not have enough interfaces to reserve an interface for each inter-AS VPN, the inter-AS VPN Option B solution can be used on the network.

Pre-configuration Tasks

Before configuring inter-AS VPN Option B, complete the following tasks:

  • Configure an Interior Gateway Protocol (IGP) for the MPLS backbone network of each AS to ensure IP connectivity on the backbone network within each AS.
  • Configure the basic MPLS functions and MPLS Label Distribution Protocol (LDP) for the MPLS backbone network of each AS.
  • Configure VPN instances on the PE devices connected to CE devices and associate the VPN instances with PE interfaces connected to CE devices in each AS.
  • Configure route exchange between the PE and CE devices in each AS.

For detailed configurations, see Configuring Basic BGP/MPLS IP VPN Functions.

Configuration Procedure

If load balancing needs to be performed between multiple tunnels, you also need to complete the task Configuring and Applying a Tunnel Policy.

  • The inter-AS VPN Option B solution does not support TE tunnels.
  • In inter-AS VPN Option B, the ASBRs maintain and advertise VPNv4 routes of inter-AS VPNs. If the ASBRs work as PE devices, configure VPN instances on the ASBRs to enable them to exchange routing information with CE devices. The configuration is the same as that on common PE devices.
Updated: 2019-04-03

Document ID: EDOC1100075353

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