ONL provides multiple options for forwarding agents and APIs to control forwarding on switches. The options go from direct (OpenNSL, SAI, OF-DPA) to full systems (FBOSS). Each option is available via installable packages.
OpenNSL Provides a Open abstraction interface to supported Broadcom chipsets and is supported by Accton on many of their platforms.
OF-DPA is a OpenFlow focused API from Broadcom and is supported on most platforms.
SAI is a fully open multi-vendor abstraction interface that runs on switching chipsets from Broadcom, Cavium, Mellanox and more.
Routing and Switching Agents
ONL Supports the Facebook FBOSS fowarding agent. FBOSS currently only runs on the Wedge with other systems in the works.