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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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Setting Up an L2VPN Using a GRE Tunnel

Setting Up an L2VPN Using a GRE Tunnel

Usually, a Multiprotocol Label Switching (MPLS) VPN backbone network uses label switched paths (LSPs) as public network tunnels. If the core devices (P devices) on the backbone network do not support MPLS but the edge devices (PE devices) support MPLS, LSPs cannot be used as public network tunnels. In this scenario, a GRE tunnel can be used instead to provide the Layer 2 virtual private network (L2VPN) solution on the backbone network.

As shown in Figure 1-5, L2VPN services are deployed on PE1 and PE2 to allow communication between the L2VPN sites of the enterprise. When backbone network devices have MPLS disabled or do not support MPLS, an LDP LSP over a GRE tunnel needs to be set up between PE1 and PE2.

Figure 1-5 LDP over GRE application in an enterprise L2VPN solution (MPLS not supported on the P devices)

As shown in Figure 1-6, MPLS is enabled only on P2 but not P1 on the backbone network. A GRE tunnel can be set up between PE1 and P2, in order to set up an LDP LSP over the GRE tunnel.

Figure 1-6 LDP over GRE application in an enterprise L2VPN solution (MPLS supported only on P2)

Updated: 2019-04-03

Document ID: EDOC1100075353

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