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Transcript
The 21st Century Intelligent Network Tony Li, Carl DeSousa 12-May-17 www.procket.com © 2004 Procket Networks, Inc. All rights reserved. CONFIDENTIAL Fundamentals •Profitability drives the new network • New revenues through new applications • • • • Video telephony & conferencing Pervasive broadband access HDTV distribution, VOD, gaming FTTP •Decreased expenses • Capital efficiency • Operational efficiency •Focus today on network architectures 12-May-17 2 © 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 12-May-17 3 © 2004 Procket Networks, Inc. All rights reserved. CONFIDENTIAL 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? 12-May-17 4 © 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 12-May-17 5 © 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 12-May-17 6 © 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 12-May-17 7 © 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 12-May-17 8 © 2004 Procket Networks, Inc. All rights reserved. CONFIDENTIAL