This document discusses software-defined optical networks (SDON). It summarizes that SDON separates the control and data planes in networks, with a centralized controller taking command. The benefits include more efficient utilization of network resources through identifying packet flows and making smarter decisions. SDON also enables dynamic provisioning of network infrastructure to match daily traffic patterns. While direct control of optical networks offers most benefits, indirect control through an orchestration layer is easier to implement initially.

1. Software
Defined
Optical
Networks
Jim Theodoras
March 2013

2. What is SDN?
• Today, routers control themselves, passing messages
between them
• SDN separates the Control and Data planes
• A separate, centralized controller then takes command
Control
Control
Data
Data
Control Control
Data Data
Data Data
Control
Data
Data
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3. SDN in a Single Sentence
• The hope/expectation of better efficiency/utilization through
identifying flows of packets and making smarter holistic decisions
• A good analogy would be the Air Traffic Control system
* http://mattsflight.blogspot.com
*
http://virtualskies.arc.nasa.gov/atm/6.
html *
flightradar24.co
m
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4. Benefits of Data Center Interaction
• Decades of work have yielded today’s agile core networks
• Unfortunately, the information to make intelligent decision resides at
higher layers
• Problem made worse by today’s flow dominated traffic
Gridless
Hybrid ROADM
EDFA/RAMAN
Amp
Intelligent
MUX
Router Coherent Router
Receiver Agile
Core
Network
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5. Example of SP Applications
• Telefonica I&D – IP Offloading Manager
• When traffic exceeds a threshold, an additional link is provisioned
New circuit
provisioning time
Configured Threshold
Circuit deprovisioning
time
 49 second bring-up
Rollback Threshold  4 second teardown
 Fully automatic
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6. SDN for Dynamic SP Infrastructure
• Provisioning for peak traffic is losing battle, and only getting worse.
• Answer is dynamic network infrastructure.
Site B
Site A Daytime Configuration
2 x 10G
1x 10G  All Offices/Sites working
1x 10G Nighttime Configuration
1x 10G  Backup between A/B
 Double the bandwidth
Site C
* Details to be announced at Internet2 April 2013.
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7. Direct vs Indirect Model
• How to best extend SDN to transport layer?
• Direct control yields most potential benefits at cost of
complexity and latency
• Indirect control is easier to implement, but limits potential of
future apps
Orchestration Layer
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8. Breaking a Huge Task into Layers
• Transport Layer
• Switching Layer
• Orchestration Layer
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9. Breaking a Huge Task into Layers
• Transport Layer
• Switching Layer PTX-LR2
• Orchestration Layer
100G OTN
10GE
DWDM Shelf PTX-LR1
PTX3000
DWDM Shelf
FSP3000
DWDM Shelf
100G OTN
10GE 10GE
100GE
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10. Breaking a Huge Task into Layers
• Transport Layer
• Switching Layer
• Orchestration Layer
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11. SDN and Optical, the Perfect Match
• Virtualization beyond Data Center boundaries
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12. Thank you
info@advaoptical.com
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