11.12. CONCLUSION
In this chapter, we have described the mechanisms underpinning Layer 2 transport over MPLS, and compared the two main control plane approaches that are in use.
The ability to transport Layer 2 traffic over an MPLS network is a key ingredient of network convergence, allowing traffic to be migrated from ATM and Frame Relay networks and allowing new services based on Ethernet transport to be created. In the Ethernet case, the service is a natural extension of the technology already used within the enterprise. In the next chapter, we will see how the service provider can go one step further by offering an Ethernet multipoint service using a scheme called the Virtual Private LAN Service (VPLS).
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