Page 113 - ITU-T Focus Group IMT-2020 Deliverables

ITU-T Focus Group IMT-2020 Deliverables 3

6.2.4.2 ONOS System Tiers

ONOS is architected with tiers of functionality

6.2.4.3 ONOS Sub Systems

ONOS defines several primary services:
Device Subsystem - Manages the inventory of infrastructure devices.
• Link Subsystem - Manages the inventory of infrastructure links.
• Host Subsystem - Manages the inventory of end-station hosts and their locations on the network.
• Topology Subsystem - Manages time-ordered snapshots of network graph views.

• PathService - Computes/finds paths between infrastructure devices or between end-station hosts
using the most recent topology graph snapshot.
• FlowRule Subsystem - Manages inventory of the match/action flow rules installed on infrastructure
devices and provides flow metrics.
• Packet Subsystem - Allows applications to listen for data packets received from network devices and
to emit data packets out onto the network via one or more network devices.

6.2.4.4 ONOS Architecture
The various subsystems that are part of ONOS are mentioned below

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