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In a Layer 3 network only, you can configure virtual private LAN service (VPLS), which is an Ethernet-based point-to-multipoint Layer 2 VPN. It enables you to connect geographically dispersed Ethernet local area networks (LAN) sites to each other across an MPLS backbone. For ISP customers who implement VPLS, all sites appear to be in the same Ethernet LAN even though traffic travels across the service provider's network.