The document discusses the business case for Layer 2 MPLS VPNs. It outlines how MPLS L2VPNs allow service providers to leverage their IP infrastructure while continuing to offer Frame Relay and ATM services to customers. MPLS L2VPNs provide Layer 2 connectivity and allow for a gradual migration to Ethernet and IP-based networks. The key benefits are reducing costs by consolidating services on a single IP infrastructure while maintaining revenue from existing Frame Relay/ATM customers.