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+.. _controlplane:
+
+The Control Plane
+-----------------
+
+The control plane follows a layered data representation. This document describes the
+model starting from the lowest layer. The description uses IPv4 addresses and
+protocols, but all concepts apply equally to the IPv6 equivalents. The diagrams
+all portray the CLI command to install the information in VPP and an
+[approximation of] a UML diagram [#f1]_ of the data structures used to represent that
+information.
+
+.. toctree::
+
+ neighbors
+ routes
+ attachedexport
+ graphwalks
+ marknsweep
+
+.. rubric:: Footnotes:
+
+.. [#f1] The arrow indicates a ‘has-a’ relationship. The object attached to the arrow head ‘has-a’ instance of the other. The numbers next to the arrows indicate the multiplicity, i.e. object A has n to m instances of object B. The difference between a UML association and aggregation is not conveyed in any diagrams. To UML aficionados, I apologize. Word is not the best drawing tool.