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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 C

Configuring Inter-AS VPN Option C

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 each AS needs to exchange a large number of VPN routes, inter-AS VPN Option C is a good choice to prevent the autonomous area border routers (ASBRs) from becoming bottlenecks that impede network expansion.

Pre-configuration Tasks

Before configuring inter-AS VPN Option C, 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

All the following tasks are mandatory. Perform these tasks in sequence to complete the inter-AS VPN Option C configuration.

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

NOTE:
  • The inter-AS VPN Option C solution does not support TE tunnels.
  • In inter-AS VPN Option C mode, do not enable LDP between ASBRs. If LDP is enabled on the interfaces between ASBRs, LDP sessions are established between the ASBRs. If a large number of BGP routes exist, many LDP labels are occupied.
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Updated: 2019-04-03

Document ID: EDOC1100075353

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