6 The control plane follows a layered data representation. This document describes the
7 model starting from the lowest layer. The description uses IPv4 addresses and
8 protocols, but all concepts apply equally to the IPv6 equivalents. The diagrams
9 all portray the CLI command to install the information in VPP and an
10 [approximation of] a UML diagram [#f1]_ of the data structures used to represent that
21 .. rubric:: Footnotes:
23 .. [#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.