- MPLS VPN
MPLS VPN is a family of methods for harnessing the power of
Multiprotocol Label Switching (MPLS) to createVirtual Private Network s (VPNs). MPLS is well suited to the task as it provides traffic isolation and differentiation without substantial overhead.Layer 3 MPLS VPN
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 support
Quality of Service .Layer 2 MPLS VPN
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. The specification is based on theMartini draft s (uses LDP for signalling) or Kompella Drafts (uses BGP for signalling) which define methods to transport layer 2 packets across MPLS networks, and methods to encapsulate transport protocols such as ATM,Ethernet , and SONET.The primary advantage of this MPLS VPN type is that it can transparently replace an existing dedicated facility without reconfiguration, and that it is completely agnostic to upper-layer protocols. By contrast, in a layer 3 VPN the hosts must speak IP.
Multipoint Layer 2 MPLS VPN
ee also
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VPLS *
MPLS
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