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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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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).

The device can implement inter-AS VLL Option A (VRF-to-VRF).

In inter-AS Option A, an 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 4-8 shows the inter-AS option A networking.

Figure 4-8 Inter-AS Option A

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

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Updated: 2019-04-03

Document ID: EDOC1100075353

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