This document discusses software defined optical networks using SDN. Key points include: - SDN and OpenFlow can decouple the data and control planes in optical networks for automated provisioning and unified control. - There are challenges in applying SDN to optical networks including switching constraints, physical impairments, multi-domain/multi-technology operation, and network virtualization. - OpenFlow extensions are needed to abstract optical network elements and account for characteristics like flexible grid networks, impairment awareness, and multi-dimensional resource allocation. - Proof-of-concept demonstrations have shown the potential for media-aware SDN, packet and optical convergence, and virtualization across multiple domains.

1. Software Defined Optical Networks
Mayur Channegowda

2. Trends
• Cloud:
– Hybrid Clouds over Federated Clouds

3. Requirements
• Dynamic, flexible
• Real-Time Analysis for adaptive networks
– Efficiency of network links
• Application Aware (Integrated IT+Network Sol.)
• Multi-Technology and Multi-Domain aspects
• Capabilities: Virtualization

4. Optical Trends
– Elastic optical networks
– Space Division Multiplexing
Sakaguchi et al., OFC 2012 PDP5C.1
305 Tb/s

5. Importance of control plane
• Multiple Dimensions:
– Port, core, spectrum, Fibre etc.
– Impairments
• Network complexities
– Tracking & Routing Superchannels
– Node architecture reconfiguration
• Spectrum fragmentation

6. SDN

7. SDN
 Utilizing Software Defined Networking (SDN) and
OpenFlow(OF) to
 Decouple the data plane and control plane
 Logically Centralized control plane for automated
provisioning
 Enable unified control and management for packet and
circuit switched network
• Multilayer operability
• New services
• Traffic engineering

8. Key challenges for Optical OpenFlow based SDN
 why not GMPLS ?
– Complex, inflexible and closed architecture
 Challenges for Unified Control Plane
– Switching constraints, Physical Impairments, Power Equalization, RWA
Multi-Domain, Multi-Technology Operation
Optical SDN support for virtualization

9. • Abstractions

10. OpenFlow switch abstraction
ofport
1
ofport
2
ofport
n
Optical Network Element
Shelf 1
Module1
Port 1
Port k
Modulem
Port 1
Port k
Shelf n
Module1
Port 1
Port k
Modulem
Port 1
Port k
Rule
Switch &
Port
details
OF
connmgr

11. • Switching constraints, Physical Impairments, Power Equalization, RWA

12. Network Hardware Abstraction Layer

13. Software Defined Networking (SDN) over SDM
• Multi-dimensional slicing service calculates best resources to allocate S/F/t

14. Multi dimension
Application
OpenFlow (or others) Interface
Features
(flexi, gain,MCF,
modulation)
Features
(flexi, gain,MCF,
modulation}
Features
(flexi, gain,MCF,
modulation)
Features
(flexi, gain,MCF,
modulation)
Northbound Interface
A
B
C
d
Request (Src,Dst,QoT)
SDN Controller
Technology mapper

15. SDN over SDM Scenario Flow space Switching [Dimension-less
Switching]
Core
Fibre
Center Freq
BW
4
Core
Fibre
Center Freq
BW
Core
Fibre
BW
Core
Fibre
Center Freq
BW
Core
Fibre
Center
Freq
BW
Core
Fibre
Center Freq
BW
Multi Dimension
Switch
Multi Dimension
Switch
Multi Dimension
Switch
Multi Dimension
Switch

16. Flow Definition (Fixed & Flexible DWDM grid)

17. OpenFlow Extensions for Optical SDN
impairments
Extended by
High-performance Network Group
Flow Mode
(Actions)
Add/Delete
XC
Fixed Ports, channels, constraints type
Flexi Ports, bandwidth, center frequencyConfigure
Tx/Rx
OpenFlow
Messages
Switch
Feature
Fixed
Flexi
Port Peering
Channel spacing per port
Channels per port
Constraints per
port
Power
Bandwidth range and granularity per port
Center frequency range
Signal type (modulation) per port
Constraints
per port
Power
Impairments
Cross Technology
Domains/Cross Overs

18. • Use cases

19. OpenFlow Architecture with GMPLS
GMPLS
GMPLS
GMPLS
OpenFlow
Controller
SNMP SNMP SNMP
FEATURES_REQ.
FEATURES_REQ
FEATURES_REQ.
FEATURES_REPLY
FEATURES_REPLY
GMPLS
Control
Lib.
OSPF
OSPF-TE
OSPF
OSPF-TE
OpenFlow
Agent
OpenFlow
Agent
OpenFlow
Agent

20. OpenFlow Enabled Optical Network Architecture:
Standalone OpenFlow model
OpenFlow
Controller
Internal API Internal API Internal API
CFLOW_MOD
CFLOW_MOD
CFLOW_MOD
OpenFlow
Agent
OpenFlow
Agent
OpenFlow
Agent

21. Proof of Concept:
Media-Aware SDN network
OpenFlow
Flow msgs
Visualization
Facility
High Capacity
Network
End-User
PCE based media over extended
controller
(3) Reserve Resources
(2) Submit Request including User
Context
(1) Publish Service and Infrastructure
Information
Request
Path
Computation
Streaming Server
OF Agent
OF Agent
OF Agent
OF switch
OF switch
ADVA ROADM
ADVA ROADM

22. Packet and Optical Convergence
Fully Converged OpenFlow [ECOC2012 PD]

23. OpenFlow Extensions for Optical SDN
• OpenFlow Controller consideration in technologically heterogeneous domains
Multi-Domain Scenario Flow Mapping Rule
Flexi Grid  Fixed Grid Each Center frequency and bandwidth must
be compatible with WDM Grid
Flexi Grid  Packet
switched
One or multiple packet flow identifiers must
be mapped to each center frequency +
bandwidth
Fixed Grid  Packet
switched
One or multiple packet flow identifiers must
be mapped to each channel
Packet
Domain
Fixed
WDM
Flexi
WDM
Network Operating System [OpenFlow Controller, Action on Flows]

24. OFC 2014 (Strauss Project)
z
OPS-based
metro network A
OPS2OPS1
Gate sw
DMT Transceivers
100G
25G
25G
50G 50G
100G 50G
OPS<->OCS
converter
OpenFlow
Controller
50G
Flow of optical packets
λ path
OPS<->OCS
converter
TX1(100G)
RX1 RX2
RX3
TX2(40G)
TX3(40G)
OpenFlow
agents
Optical packets
OCS-based
core network
OpenFlow
Controller
OPS-based metro
network B
ABNO
Controller
Provisioning
Manager
SDN Network Orchestration
Extended
PCEP for OF
Topology
Rest API
Flow
Programmer
REST API
Proprietary
Interface
Proprietary
Interface
Topology
API
PCE
Topology
Server

25. Virtualization
Extended Controller 1
PCE API
Extended Controller 2
PCE API
PCE
NFV controller
Optical Flowvisor

26. Slicer
Classifier
Topology
Controller
Flow Message Ctrl
Node
Constraints
Extended OF Protocol
Based on [OF 1.0 v0.3]
Optical Topology
Planner & QoT
estimator
University of Bristol, UK
OpenFlow
Switch
Polatis/Calient Fiber switches
OpenSource GMPLS controlled
Virtualization to 4 switches
WSS-ROADM
Directionless
4ch add/drop
2 x 1GE (SFP)
2x10GE (XFP)
DWDM
iPLC-ROADM
WSS-ROADM
Fixed 4ch add/drop
2 x 10GE (SFP+
DWDM) Flexible wdm devices
OpenFlow
Switch
Optical FlowVisor
Network Functions
Policy Topology QoT
PCE
…vNET1
Extended OF Controller
vNETn
Extended OF Controller
Virtual PCE
Application Layer
Virtualization Layer
Virtual PCE
DEMO Setup
N
F
V
contr
oller

27. Applications Profile

28. Architecture

29. All optical SDN based data centres

30. • Experimental Facility

31. 1 x Calient DiamondWave Fiber switch
OpenSource GMPLS controlled
Virtualization to 4 switches
WSS-ROADM
Directionless
4ch add/drop
2 x 1GE (SFP)
2x10GE (XFP)
DWDM
iPLC-ROADM
3 x openflow enabled switches
(Arista, Brocade & Extreme)
1 or 10 GE
VPN
Server
Cisco
Router
Campus Ethernet Switching
4 x NEC Switch:
20 x 1000Base-T (RJ-45)
4 x 1000Base-X (SFP)
2 x 10GBase-X (XFP)
1~10GE
Xen/KVM Virtual Machines
Application
Servers
Database
Servers
NFS
SDN/OpenFlow Controllers (NOX, Trema, FlowVisor), GMPLS,
Control Frameworks (ofelia, opennaas, openstack)
WSS-ROADM
Fixed 4ch add/drop
2 x 10GE (SFP+
DWDM)
DWDM
10 GE
Flexible wdm devices
1/10/40Gig
HPN SDN testbed

32. Create & Run your Experiment!
Have an idea (SDN APP!)
1
Log on to OFELIA & FIBRE!
2
Configure your network slice!3 Run your experiment!!!
Firewall, Load Balancer
Controller
(Intelligence)
Application 1
Application 2 Application 1
Application 2
Data Center
Services
Network as a Service
(NaaS )
4

33. Partners with complementary
technological strengths and
user groups from five
countries with strong
research communities
in networking.
OFELIA - Aim and Partners.
Build first OpenFlow test environment in Europe.
Complimentary strength & representation of most important research communities.
Additional partners and European manufacturers will be involved through Open Calls
 Three years project, starting Oct 2010
 7 OpenFlow-enabed islands at academic institutions:
 Berlin (TUB) – partial replacement of existing
campus network with OF-switches
 Gent (IBBT) – central hub, large-scale emulation
 Zürich (ETH) – connection to OneLab and GpENI
 Barcelona (i2CAT) – experience with facility
projects (IaaS, DRAGON)
 Bristol(UNIVBRIS)– national hub for UK optical
 ITALY (CREATNET & CNIT)
 community; L2 (Extreme) switches, FPGA testbed
 NEC provides homogeneous L2 hardware platform (OF-
enabled Ethernet switches)
 ADVA as major vendor of optical access and data center
equipment
 Different external vendors(Juniper, Extreme)
 Explore extensions of OpenFlow towards wireless and
optical transmission
Federation of Seven islands
partner
L2
L1/optics
L3
Wireless
emulation
ControlSW
processing
USconnections
MMsource
iBBT X X X X
TUB X X
I2cat X X X
UNIVBRI
S
X X x X X X
ETH X X
36

34. Partners
EU
i2CAT
NXW
UPMC
UnivBRIS
UTH
NICTA
BRAZIL
UFPA
CPqD
RNP
UFF
UFGUFRJ
UFSCar
UNIFACS
USP
• List of partners

35. FIBRE Context (INTER Federation: different control frameworks)

36. Federation

37. • How to collaborate

38. • OpenFlow Agents
• Controllers: NOX, POX & OpenDaylight
• APPS: Virtualization(Optical Flowvisor),
algorithms, TE, PCE
• Testbed
• UK-BR LINK

39. Backup- UEssex Island