H H igh- igh- Ava Ava ilability ilability N N etwork etwork A A rchitectures rchitectures (HAVANA): (HAVANA): Comparative Study of Fully Pre- Cross-Connected Protection Architectures for Transparent Optical Networks Contact: [email protected]A. Grue, W. D. Grover, J. Doucette, B. Forst, D. Onguetou, D. Baloukov TRLabs (Network Systems Group) 7th Floor, 9107 – 116 Street Edmonton, Alberta, Canada T6G 2V4 M. Clouqueur, D. Schupke Nokia Siemens Networks (Network Control-Plane and Transport) Otto-Hahn-Ring 6 81730 Munich, Germany
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High-Availability Network Architectures (HAVANA): High-Availability Network Architectures (HAVANA): Comparative Study of Fully Pre-Cross- Connected Protection.
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• Objective: To characterize and compare many different pre-cross-connected protection architectures on a single network, under real-world constraints to network intelligence and flexibility
• Project Phases1. Basic architecture design (capacity for single span failure restorability)
2. Dual failure analysis of basic designs
3. Wavelength assignment: feasibility and methods
4. Optical path length constraints: analysis and enhancement
• Outputs1. A set of “best feasible” network designs
2. Theoretical insights into architectural properties
3. Design methods and insights
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HAVANA
July 9, 2007Confidential to TRLabs and Nokia-Siemens Networks
OutlineOutline
• Architectures
• Project Overview
• Methods and Results– Basic architecture design
• Conclusions
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HAVANA
July 9, 2007Confidential to TRLabs and Nokia-Siemens Networks
““TestSet0” NetworkTestSet0” Network
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HAVANA
July 9, 2007Confidential to TRLabs and Nokia-Siemens Networks
Working Routing: ConstraintsWorking Routing: Constraints
• Models for FIPP, PXTs, and p-cycles are SCP (spare capacity placement) only; working routing is static
• Both FIPP and PXTs require a working routing such that at least one path, disjoint from the working path, exists between the end nodes
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HAVANA
July 9, 2007Confidential to TRLabs and Nokia-Siemens Networks
• Only DSP design satisfied reach constraints with the original design
• PXTs and FIPP p-cycle designs easily found by modifying the pre-processing step
• Compliant p-cycle design found by using a new ILP model altogether
60%
80%
100%
120%
140%
160%
180%
DSP PXTs p-Cycles FIPP p-Cycles
Red
un
dan
cy
Path Length Controlled Design Costs
Original Design Costs
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HAVANA
July 9, 2007Confidential to TRLabs and Nokia-Siemens Networks
OutlineOutline
• Architectures
• Project Overview
• Methods and Results
• Conclusions
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HAVANA
July 9, 2007Confidential to TRLabs and Nokia-Siemens Networks
ConclusionsConclusions
Dual Failure Restorability
Wavelength Assignment
Optical Reach
Cost of Design
p-Cycles
FIPP p-Cycles, PXTs
DSP
Best
Worst
DSP
PXTs, p-Cycles
FIPP p-Cycles
PXTs
FIPP p-Cycles
DSP, p-Cycles
DSP
p-Cycles
FIPP p-Cycles, PXTs
• Architecture Scorecard:
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HAVANA
July 9, 2007Confidential to TRLabs and Nokia-Siemens Networks
To Find Out More…To Find Out More…
• References on PXTs, FIPP p-Cycles, DSP (listed in paper)
A. Kodian, W.D. Grover, “Failure Independent Path-Protecting p-Cycles: Efficient and Simple Fully Pre-connected Optical-path Protection,” IEEE Journal of Lightwave Technology, vol. 23, no.10, October 2005.
T. Y. Chow, F. Chudak, A. M. Ffrench. “Fast Optical Layer Mesh Protection Using Pre-Cross-Connected Trails,” IEEE/ACM Trans. Networking, vol. 12, no. 3, pp. 539-547, June 2004.
Koster, A. Zymolka, M. Jager, R. Hulsermann, “Demand-wise Shared Protection for Meshed Optical Networks,” Journal of Network and Systems Management, vol. 13, no. 1, pp. 35-55, March 2005.
A. Grue, W.D. Grover, “Characterization of pre-cross-connected trails for optical mesh network protection,” OSA Journal of Optical Networking, May 2006, pp.493-508
July 9, 2007Confidential to TRLabs and Nokia-Siemens Networks
The “Z” Case in FIPP The “Z” Case in FIPP pp-Cycle Design-Cycle Design• Protection paths are pre-connected, but the protection path to be used will
depend on the failure scenario
• For the purpose of this study, the network was deemed not intelligent enough to handle this degree of failure dependency
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HAVANA
July 9, 2007Confidential to TRLabs and Nokia-Siemens Networks
The “Z” Case in FIPP The “Z” Case in FIPP pp-Cycle Design-Cycle Design• Protection paths are pre-connected, but the protection path to be used will
depend on the failure scenario
• For the purpose of this study, the network was deemed not intelligent enough to handle this degree of failure dependency
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HAVANA
July 9, 2007Confidential to TRLabs and Nokia-Siemens Networks
Optical Path Lengths for Optical Path Lengths for pp-Cycles-Cycles• In a path-protecting architecture, protection paths are completely substituted
for working paths during failure, meaning that the lengths of the restored state paths are not in question
• In a span-protecting architecture (p-Cycles, span p-Trees), protection paths are only substituted for the failed span, which may be used by many working paths with different lengths