Transcript The 21st Century Intelligent Network

The 21st Century Intelligent Network
Tony Li,
Carl DeSousa
29-Mar-16
www.procket.com
© 2004 Procket Networks, Inc. All rights reserved.
CONFIDENTIAL
Fundamentals
•Profitability drives the new
network
• New revenues through new
applications
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Video telephony & conferencing
Pervasive broadband access
HDTV distribution, VOD, gaming
FTTP
•Decreased expenses
• Capital efficiency
• Operational efficiency
•Focus today on network
architectures
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© 2004 Procket Networks, Inc. All rights reserved.
CONFIDENTIAL
Optical Switching: A Pragmatic Look
• Optical switching can decrease switching costs
• New switching layers have associated management
costs
• Demand from full lambda user applications is low
• Greater need for optical switching in trunking
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© 2004 Procket Networks, Inc. All rights reserved.
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An Example
• Partial mesh topologies result
in transit switching
• Large traffic aggregates can
economically be optically
switched at transit points
• How can we optimally use the
lambda topology?
• Can we provide traffic
engineering at the lambda
level?
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© 2004 Procket Networks, Inc. All rights reserved.
CONFIDENTIAL
Traffic Engineering
• Commonly used in telephony networks
• Successful usage in IP networks with MPLS/TE
• Can we extend this cleanly to the lambda level?
• Inputs:
• Node-to-node traffic matrix at the trunk level, time variant
• Topology, capacity and costs
• Desired results: (how do we set up switches)
• Support current offered traffic load
• Optimal assignments of lambdas to minimize global costs
• Dynamic recovery to address failures
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© 2004 Procket Networks, Inc. All rights reserved.
CONFIDENTIAL
Approaches to dynamic recovery
• Pre-computation
• For each possible network failure, compute alternative optimal
routing
• Computationally intensive: scales linearly with number of
elements
• Does not reasonably support multiple failures
• Dynamic computation
• Intelligence in the network computes recovery routing
• Suboptimal computation unless done with global data
• Slower recovery times
• Can adapt to multiple failures easily
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© 2004 Procket Networks, Inc. All rights reserved.
CONFIDENTIAL
Hybrid computation
• Combine pre-computation and dynamic computation
• Pre-compute most significant recovery options for single
failures
• Ignore low-priority recovery
• Ignore multiple failures
• Intelligence in the network to dynamically compute remaining
cases
• Centralized computation to recover global optimality for the
longer term
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© 2004 Procket Networks, Inc. All rights reserved.
CONFIDENTIAL
Benefits and constraints
• Smooth improvement of efficiency over time
• Pre-computation provides fast recovery for covered cases
• Dynamic computation provides coverage for other cases
• Long term optimization eventually reaches maximal efficiency
• Effective dynamic computation requires peer model
optical network
• IP layer must know about optical topology and capacity
• Optical layer must know about traffic priorities
• Overlay model abstracts optical topology & capacity
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© 2004 Procket Networks, Inc. All rights reserved.
CONFIDENTIAL