MPLS VPN
MPLS VPN is a family of methods for harnessing the power of Multiprotocol Label Switching (MPLS) to create Virtual Private Networks (VPNs). MPLS is well suited to the task as it provides traffic isolation and differentiation without substantial overhead. A layer 3 MPLS VPN, also known as L3VPN, combines enhanced BGP signaling, MPLS traffic isolation and router support for VRFs (Virtual Routing/Forwarding) to create an IP based VPN. Compared to other types of VPN such as IPSec VPN, ATM, MPLS L3VPN is more cost efficient and can provide more services. Layer 3 MPLS VPNs also supports Quality of Service. A layer 2 MPLS VPN, also known as L2VPN, is a point-to-point pseudowire service. It can be used to replace existing physical links.
