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The remaining sections of the Architecture Guide elaborate on the design and implementation of the subsystems that make up the above-mentioned tiers, and the OpenFlow provider that ships with ONOS.

Some terms and conventions used in the rest of the guide are:

  • "infrastructure" and "network" refers refer to the network controlled by ONOS, and may be physical, virtual, or emulated.
  • A "device" is a network node, such as a switch, router, access point, or middle box. They usually have multiple interfaces, and may be software or hardware.
  • A "path" is a set of one or more links. The links must be adjacent. 
  • Proper nouns, such as "Network" and "Link", are ONOS's representations of the infrastructure component of the same name.

It is impossible to avoid referring back to the codebase when we speak of implementation. The following conventions are used with regards to code:

  • Class, Interface, and Object names are monotype, e.g. DeviceManager.
  • Method names are monotype and end in parenthesis, e.g. emit().
  • Inlined package names are surrounded by square brackets, e.g. [org.onlab.onos.net.DeviceId]