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Configuration Guide - VPN 01

NE05E and NE08E V300R003C10SPC500

This is NE05E and NE08E V300R003C10SPC500 Configuration Guide - VPN
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Configuring Inter-AS VPN Option C (Solution 1)

Configuring Inter-AS VPN Option C (Solution 1)

Multi-hop EBGP connections are established between PEs of different ASs to exchange VPNv4 routes.

Usage Scenario

If the MPLS backbone network bearing VPN routes spans multiple ASs, the 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 ASBR from becoming a bottleneck that impedes network expansion. The following solutions can be used to implement inter-AS VPN Option C:

  • Solution 1: After learning the labeled BGP routes of the public network in the remote AS from the remote ASBR, the local ASBR allocates labels for these routes, and advertises these routes to the IBGP peer that supports the label switching capability. In this manner, a complete LSP is set up.
  • Solution 2: The IBGP peer relationship between the PE and ASBR is not needed. In this solution, an ASBR learns the labeled public BGP routes of the remote AS from the peer ASBR. Then these labeled public BGP routes are imported to an IGP to trigger the establishment of an LDP LSP. In this manner, a complete LDP LSP can be established between the two PEs.

Solution 1 is described in this section, and solution 2 is described in Configuring Inter-AS VPN Option C (Solution 2).


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 then established between the ASBRs. As a result, the ASBRs establish an egress LSP and send Mapping messages to upstream ASBRs. After receiving Mapping messages, the upstream ASBRs establish a transit LSP. If a large number of BGP routes exist, enabling LDP on the interfaces between ASBRs leads to the occupation of a large number of LDP labels.

Pre-configuration Tasks

Before configuring inter-AS VPN Option C (solution 1), complete the following tasks:

Configuration Procedures

Perform one or more of the following configurations as required.

Updated: 2019-01-14

Document ID: EDOC1100058925

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