Alcatel-Lucent Google Juniper Networks Nortel LabN This document describes the Basic Mode of Layer 1 VPNs (L1VPNs). L1VPN Basic Mode (L1VPN BM) is a port-based VPN. In L1VPN Basic Mode, the basic unit of service is a Label Switched Path (LSP) between a pair of customer ports within a given VPN port topology. This document defines the operational model using either provisioning or a VPN auto-discovery mechanism, and the signaling extensions for the L1VPN BM. [STANDARDS-TRACK]