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MPLS Fundamentals by Luc De Ghein - CCIE No. 1897

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Label Switch Controller

The label switch controller (LSC) is a piece of hardware designed to perform the control plane functions needed to make the ATM switch an ATM LSR. The Cisco BPX is an ATM switch that needs an LSC to become an ATM LSR. The LSC takes care of the control plane functions like the IGP, the routing table, and LDP. The PBX still performs the switching of the ATM cells in the data plane. In the case of the BPX, the LSC is a Cisco 7200 router. The LSC controls the BPX through an ATM interface over which the Virtual Switch Interface (VSI) protocol is running. VSI allows the router to control the ports, trunks, or virtual trunks on the BPX. The result is the same as if the LSC were internal to the ATM switch. When a PBX has an LSC ...

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