This document defines an Open Shortest Path First (OSPF) based Layer 1 Virtual Private Network (L1VPN) auto-discovery mechanism. This mechanism enables provider edge (PE) devices using OSPF to dynamically learn about the existence of each other@ and attributes of configured customer edge (CE) links and their associations with L1VPNs. This document builds on the L1VPN framework and requirements and provides a L1VPN basic mode auto-discovery mechanism.