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S12700 V200R011C10 Configuration Guide - VPN

This document describes the VPN configuration procedures and provides configuration examples.
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Inter-AS VPLS

Inter-AS VPLS

Inter-AS VPLS refers to the application of the VPLS across multiple ASs. The switch supports only inter-AS Option A.

When using inter-AS VPLS, you do not need to consider the learning or forwarding functions of VSIs. Only establishment of PWs between PEs is important. Inter-AS VPLS therefore has the same implementation methods as those of inter-AS L2VPN.

In Option A, configuration is easy. There is no need to run MPLS between ASBRs or perform particular configurations for inter-AS communications. However, Option A has poor expansion capacity and higher requirements for PEs. It is suitable for use in the early servicing stage when the number of inter-AS VPNs is small.

Inter-AS Kompella VPLS (Option A)

Figure 7-16 shows an example implementation of the inter-AS Kompella VPLS (Option A).

Figure 7-16  Inter-AS Kompella VPLS (Option A)

The inter-AS Kompella VPLS (Option A) is implemented as follows:

  • An IGP protocol is configured on the backbone network to allow communication between ASBRs and PEs. Tunnels are set up between PEs.

  • MP-IBGP peer relationships are established between the PE and ASBR in each same AS.

  • VSIs are configured on PE1, PE2, ASBR1, and ASBR2. The VSIs are bound to the AC interfaces.

Inter-AS Martini VPLS (Option A)

Figure 7-17 shows an example implementation of the inter-AS Martini VPLS (Option A).

Figure 7-17  Inter-AS Martini VPLS (Option A)

The inter-AS Martini VPLS (Option A) is implemented as follows:

  • An IGP protocol is configured on the backbone network to allow communications between devices in the same AS.

  • Basic MPLS functions are enabled on the backbone network. A dynamic LSP is set up between the PE and ASBR in each AS. A remote LDP session is set up between the PE and ASBR if they are not directly connected.

  • A VPLS connection is set up between the PE and ASBR in each AS.

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Updated: 2019-04-01

Document ID: EDOC1000178118

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