Metro Ethernet

Conclusion

As you have seen in this chapter, many extensions for routing, signaling, technology-specific parameters, and LMP allow the use of MPLS over non-packet/cell networks. Mechanisms such as link bundling and shared link groups are added to routing to influence the traffic trajectory and to take advantage of how the physical network topology is laid out. Signaling mechanisms such as the enhancements to the label allow the GMPLS label to be used as a control construct that indicates to the TDM/optical devices what circuits to switch and how to switch them. The introduction of LMP helps in the easy provisioning and protection of optical circuits by allowing channel link connectivity verification and fault management and isolation.