Demand-Based Control Planes for Switching Fabrics White Paper
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چکیده
© 2017 Cisco and/or its affiliates. All rights reserved. Modern switching fabrics use virtual network overlays to support mobility, segmentation, and programmability at very large scale. Overlays are a key enabler of the Software-Defined Networking (SDN) model of control and data plane separation for network abstraction and programmability. Locator Identity Separation Protocol (LISP) as a control plane for overlays is particularly well suited to accommodate the logical centralization of the control plane for programmability. The virtual network overlay uses a control plane to keep the mapping of endpoints to their network location up to date as endpoints move around the network. This control plane must be scalable, nimble, and extensible in handling the endpoint-to-location mappings. It is not, however, required to handle the path calculations that traditional routing protocols must handle. The path calculations required to transport traffic between locations over a multipathed network are executed by the control plane of the underlying network and are therefore abstracted from the overlay control plane.
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