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Open Network Operating System
ONOS (Open Network Operating System) is an open-source distributed software-defined networking (SDN) operating system focused on addressing routing, mobility, and network management in large-scale networks. It emphasizes reliability, scalability, and fault tolerance while allowing for flexibility in path computation and network flow management through a distributed architecture. The document outlines the architecture, core functionalities, and future directions for ONOS, aiming to build a developer community and support deployments in research and education networks.
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Open Network Operating System
- 1. ONOS Open Network Opera.ng System Open-‐Source Distributed SDN OS
- 2. Rou$ng TE Network OS Packet Forwarding Packet Forwarding Packet Forwarding Mobility Programmable Base Sta$on Openflow SDN Reference Architecture
- 3. Rou$ng TE Network OS Packet Forwarding Packet Forwarding Packet Forwarding Mobility Programmable Base Sta$on Openflow Scale-‐out? Fault Tolerance? Northbound API? SDN Persistent Ques.ons
- 4. Related Work Distributed control plaGorm for large-‐scale networks Focus on reliability, scalability, and generality State distribu.on primi.ves, global network view, ONIX API ONIX Other Work Helios, Hyperflow, Maestro, Kandoo distributed control planes NOX, POX, Beacon, Floodlight, Trema controllers
- 5. Mo.va.on for ONOS Network OS Rou$ng TE Mobility Instance 1 Instance 3 Instance 2 Instance … Distributed Network OS Rou$ng TE Mobility Proprietary efforts have been addressing these issues but are closed source Community needs an open source distributed SDN OS
- 6. Host Host Host Titan Graph DB Cassandra In-‐Memory DHT Instance 1 Instance 2 Instance 3 Network Graph Eventually consistent Distributed Registry Strongly Consistent Zookeeper ONOS core Floodlight ONOS core Floodlight ONOS core Floodlight ONOS High Level Architecture
- 7. Cassandra In-‐memory DHT Id: 1 A Id: 101, Label Id: 103, Label Id: 2 C Id: 3 B Id: 102, Label Id: 104, Label Id: 106, Label Id: 105, Label Network Graph Titan Graph DB ONOS Network Graph Abstrac.on
- 8. Switch Manager Switch Manager Switch Manager Network Graph: Switches OF OF OF OF OF OF Network Graph and Switches
- 9. SM Network Graph: Links SM SM Link Discovery Link Discovery Link Discovery LLDP LLDP Network Graph and Link Discovery
- 10. Network Graph: Devices SM SM SM LD LD LD Device Manager Device Manager Device Manager PKTIN PKTIN PKTIN Host Host Host Devices and Network Graph
- 11. SM SM SM LD LD LD Host Host Host DM DM DM Path Computa.on Path Computa.on Path Computa.on Network Graph: Flow Paths Flow 1 Flow 4 Flow 7 Flow 2 Flow 5 Flow 3 Flow 6 Flow 8 Flow entries Flow entries Flow entries Flow entries Flow entries Flow entries Flow entries Flow entries Flow entries Flow entries Flow entries Flow entries Flow entries Flow entries Flow entries Flow entries Flow entries Flow entries Flow entries Flow entries Flow entries Flow entries Flow entries Flow entries Path Computa.on with Network Graph
- 12. SM SM SM LD LD LD Host Host Host DM DM DM Flow Manager Network Graph: Flows PC PC PC Flow Manager Flow Manager Flowmod Flowmod Flowmod Flow 1 Flow 4 Flow 7 Flow 2 Flow 5 Flow 3 Flow 6 Flow 8 Flow entries Flow entries Flow entries Flow entries Flow entries Flow entries Flow entries Flow entries Flow entries Flow entries Flow entries Flow entries Flow entries Flow entries Flow entries Flow entries Flow entries Flow entries Flow entries Flow entries Flow entries Flow entries Flow entries Flow entries Network Graph and Flow Manager
- 13. SM SM SM LD LD LD Host Host Host DM DM DM Network Graph FM FM FM Distributed Registry A B C D E F Flow 1 Flow 4 Flow 7 Flow 2 Flow 5 Flow 3 Flow 6 Flow 8 Flow entries Flow entries Flow entries Flow entries Flow entries Flow entries Flow entries Flow entries Flow entries Flow entries Flow entries Flow entries Flow entries Flow entries Flow entries Flow entries Flow entries Flow entries Flow entries Flow entries Flow entries Flow entries Flow entries Flow entries Master Elec.on A: ONOS 1 C: ONOS 2 E: ONOS 3 B: ONOS 1 D: ONOS 2 F: ONOS 3 ONOS Instance 1 ONOS Instance 2 ONOS Instance 3 Distributed Registry: Master Elec.on
- 14. SM SM SM LD LD LD Host Host Host DM DM DM Network Graph FM FM FM Distributed Registry A B C D E F Master Elec.on A: ONOS 1 C: ONOS 2 E: ONOS 3 B: ONOS 1 D: ONOS 2 F: ONOS 3 ONOS Instance 1 ONOS Instance 2 ONOS Instance 3 Flow 1 Flow 4 Flow 7 Flow 2 Flow 5 Flow 3 Flow 6 Flow 8 Flow entries Flow entries Flow entries Flow entries Flow entries Flow entries Flow entries Flow entries Flow entries Flow entries Flow entries Flow entries Flow entries Flow entries Flow entries Flow entries Flow entries Flow entries Flow entries Flow entries Flow entries Flow entries Flow entries Flow entries Distributed Registry: Instance Failover
- 15. SM SM LD LD Host Host Host DM DM Network Graph FM FM Distributed Registry A B C D E F Flow 1 Flow 4 Flow 7 Flow 2 Flow 5 Flow 3 Flow 6 Flow 8 Flow entries Flow entries Flow entries Flow entries Flow entries Flow entries Flow entries Flow entries Flow entries Flow entries Flow entries Flow entries Flow entries Flow entries Flow entries Flow entries Flow entries Flow entries Flow entries Flow entries Flow entries Flow entries Flow entries Flow entries Master Elec.on A: C: ONOS 2 E: ONOS 3 B: D: ONOS 2 F: ONOS 3 ONOS Instance 2 ONOS Instance 3 Distributed Registry: Instance Failover
- 16. SM SM LD LD Host Host Host DM DM Network Graph FM FM Distributed Registry A B C D E F Flow 1 Flow 4 Flow 7 Flow 2 Flow 5 Flow 3 Flow 6 Flow 8 Flow entries Flow entries Flow entries Flow entries Flow entries Flow entries Flow entries Flow entries Flow entries Flow entries Flow entries Flow entries Flow entries Flow entries Flow entries Flow entries Flow entries Flow entries Flow entries Flow entries Flow entries Flow entries Flow entries Flow entries Master Elec.on A: ONOS 2 C: ONOS 2 E: ONOS 3 B: ONOS 3 D: ONOS 2 F: ONOS 3 ONOS Instance 2 ONOS Instance 3 Distributed Registry: Instance Failover
- 17. ONOS Current State ONOS Core ONOS Apps Derived from Floodlight 0.9.0 Network graph for topology and flow state (Titan/Cassandra) Distributed registry for master elec.on (Zookeeper) Topology discovery, path computa.on, flow management ONOS REST API: Ø Topology traversal Ø Flow path manipula.on SDN-‐IP BGP peering
- 18. ONOS Learning Curve ONOS Core ONOS Apps Eventually consistent network graph allows concurrent applica$ons Strongly consistent registry useful for control plane failovers Elec$ng master ONOS instance per switch allows scale-‐out design Need careful considera$on of latency in distributed compu$ng Graph abstrac$on makes it easy to develop applica$ons Applica$ons can be scaled-‐out if they are aware of control par$$ons
- 19. What is Next for ONOS ONOS Core ONOS Apps Reac.ve flows and low-‐latency forwarding Events, callbacks and publish/subscribe API Expand graph abstrac.on for more types of network state ONOS Northbound API Service chaining Network monitoring, analy.cs and debugging framework Community Release as open source Build and assist developer community outside ON.LAB Support deployments in R&E networks
- 20.