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CLI-based Configuration Guide - VPN

AR100, AR120, AR150, AR160, AR200, AR1200, AR2200, AR3200, and AR3600 V200R010

This document describes VPN features on the device and provides configuration procedures and configuration examples.
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Inter-AS VLL

Inter-AS VLL

The MPLS VPN solution is widely used, serving an increasing number of users in a large number of applications. As additional sites are developed in an enterprise, sites in different geographical locations are often connected to different ISP networks. Consider, for example, the inter-AS issue facing operators who manage different metropolitan area networks (MANs) or backbone networks that span different autonomous systems (AS). This scenario requires a different interworking model than the MPLS VPN architecture. This interworking model, called the inter-AS VLL, features a VPN that spans multiple ASs. In inter-AS networking, the devices located at the edge of ASs are AS boundary routers (ASBRs).

Inter-AS VLL implementation depends on the VLL mode.
  • The CCC mode uses a single label. Therefore, the inter-AS VLL can be set up when static LSPs are set up between ASBRs.

  • The SVC and Martini modes can implement inter-AS VLL Option A (VRF-to-VRF).

In inter-AS Option A, a sub-interface must be reserved for each inter-AS VC on an ASBR. The ASBRs do not require MPLS or other additional inter-AS configuration. With Option A, ASBRs of the two ASs are directly connected and function as PE devices in their respective ASs. The two ASBRs regard each other as CE devices. Figure 10-10 shows the inter-AS option A networking.

Figure 10-10  Inter-AS Option A

For details about inter-AS VPN, see Inter-AS VPN in the BGP/MPLS IP VPN Configuration.

Updated: 2019-08-07

Document ID: EDOC1100033725

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