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1、#CiscoLive#CiscoLiveDirk Schroetter,Technical Solutions Architect in cooperation withVelimir Vujnovic,Principal ArchitectBRKOPT-2015 or how to embrace tradeoffs for fun and profitLessons Learned from Designing Routed Optical Networks 2023 Cisco and/or its affiliates.All rights reserved.Cisco Public#
2、CiscoLiveEnter your personal notes hereCisco Webex App Questions?Use Cisco Webex App to chat with the speaker after the sessionFind this session in the Cisco Live Mobile AppClick“Join the Discussion”Install the Webex App or go directly to the Webex spaceEnter messages/questions in the Webex spaceHow
3、Webex spaces will be moderated by the speaker until June 9,2023.12343https:/ 2023 Cisco and/or its affiliates.All rights reserved.Cisco PublicBRKOPT-2015Agenda 2023 Cisco and/or its affiliates.All rights reserved.Cisco PublicBare minimum of analog domainOptical PerformanceTraffic demands vs.capaciti
4、esTopologies&constraintsProtecting IP on the IP LayerConclusionBRKOPT-2015 2023 Cisco and/or its affiliates.All rights reserved.Cisco Public#CiscoLiveRuss Whites Rule#1Mr.EIGRP“If you havent found the tradeoffs,you havent looked hard enough.BRKOPT-2015The bare minimum on the analog domain 2023 Cisco
5、 and/or its affiliates.All rights reserved.Cisco Public#CiscoLiveDWDM transport is analog technologyBRKOPT-2015WSS Domain1WSS Domain2ROADMROADMROADMROADMROADMROADMAD-XAD-YS_160S_0027 Spans5 SpansWSS Domain 1=S_160WSS Domain 2=S_002InputInputBaud RateChannel SpacingAmplifier ChoiceSpan Distance(km)Sp
6、an Distance(km)Span Loss(dB)Span Loss(dB)&EOLEOLOptimal Launch Power Definedper WSS Domainper WSS DomainCompute Linear OSNR with worse case EDFA Specificationper WSS Domainper WSS DomainCompute non-linear noise using Gaussian Noise ModelAdd Linear and non linear Noise+Additional penalty,i.e.CD,CD,PD
7、L,RipplePDL,RippleAdd the WSS Domains+Mux/DemuxMux/Demuxsubtract OSNR MarginAssociate interface based on performanceEnd to End Service is split into smaller WSS Domains:ROADM to ROADM-WSS Domain 1 and WSS Domain 2Required input:Topology(span length&attenuation),EOL marginsMethod:Gaussian Noise simul
8、ationInteresting:How we build the Add/Drop structure for the ROADMLesson 1:Optical Performance 2023 Cisco and/or its affiliates.All rights reserved.Cisco Public#CiscoLiveZR+and Transponder performance-comparable400 GbpsOSNR(dB)0.1 nm RBw23.122.6Baudrate(GBd)60.1469#Channels per“Band”64645454Modulati
9、on16-QAM16-QAM8 ROADMs1337 kmLatest customer ZR+test over 3rdparty DWDMBRKOPT-2015Lesson 2:Build on IP traffic demands,not capacities 2023 Cisco and/or its affiliates.All rights reserved.Cisco Public#CiscoLive8 X 8 X Tb/s installed capacity03X X Tb/s busy hour traffic.02SingleSingle wavelength on ag
10、gregation rings04Simulation using P95P95of busy hour traffic0134.1 Gb/sAverage site trafficUS operator“metro”simulation resultsWavelength usage-97%-95%Energy usage29.3 Gb/sMedian site trafficBRKOPT-2015 2023 Cisco and/or its affiliates.All rights reserved.Cisco Public#CiscoLiveTransforming Hub&Spoke
11、 to Hop-by-HopBRKOPT-2015Hop-by-HopHop-by-HopCustomer reported being short on wavelengthsDay 1Day n 2023 Cisco and/or its affiliates.All rights reserved.Cisco Public#CiscoLiveSimulation Results40%installed PMO capacityP95 busy hour trafficSum inter-site demands6.408 Tb6.408 Tb1.976 Tb1.976 TbInter-s
12、ite installed capacity38.7 Tb30.3 TbIntra-site installed capacity67.26 Tb62.8 TbZR/ZR+pluggables2Grey pluggables334314Maximum used between hubs42Maximum used on rings21WC link utilization100%70.69%Power savings from TXP elimination alone:55.000 kWh p.a.BRKOPT-2015Lesson 3:Topologies&Archi
13、tectures matter,but Constraints even more so.2023 Cisco and/or its affiliates.All rights reserved.Cisco Public#CiscoLiveA toy network showing the concept Not“one size fits all”Consider:Fiber cost/availabilityRelative importance of sitesAchievable bitratesImpact on resiliencyPhysicsBoth approaches ha
14、ve their place in designs.ABC100G50G400G400G1111BRKOPT-2015 2023 Cisco and/or its affiliates.All rights reserved.Cisco Public#CiscoLiveA toy network showing the concept Not“one size fits all”Consider:Fiber cost/availabilityRelative importance of sitesAchievable bitratesImpact on resiliencyPhysicsBot
15、h approaches have their place in designs.ABC100G50G400G400G111200G350G221BRKOPT-2015 2023 Cisco and/or its affiliates.All rights reserved.Cisco Public#CiscoLiveA toy network showing the concept Not“one size fits all”Consider:Fiber cost/availabilityRelative importance of sitesAchievable bitratesImpac
16、t on resiliencyPhysicsBoth approaches have their place in designs.ABC400G400G11450G400G22BRKOPT-2015 2023 Cisco and/or its affiliates.All rights reserved.Cisco Public#CiscoLiveReal example 1BRKOPT-201510 G of traffic 2023 Cisco and/or its affiliates.All rights reserved.Cisco Public#CiscoLiveReal exa
17、mple 2BRKOPT-2015300 G900 G 2023 Cisco and/or its affiliates.All rights reserved.Cisco Public#CiscoLiveWider channelBetter FECHigher modulationBetter spectral efficiencyUse L-Band“Easily”doneIncreased capacity per channelFewer channelsIncreased blocking probabilityIncreased reachHigher overhead eats
18、 into usable capacity Power,real estate,cost No“dramatically better”FEC on horizonMore bits per symbol-Higher capacityReach 1/constellation sizeX km 16QAM-X/4 km 64QAMMore b/s/HzDispersion coefficient Nonlinear coefficient Reduce attenuationReduce reach“Easily”doneDoubles#channelsIncreases attenuati
19、onNegatively impacts spectral efficiencyPhysics forcing architecturesRequires drastically different fiber to to have big effectNot a question of“if”but“when”physics mandates shorter pathsBRKOPT-2015Lesson 4:IP services are protected and restored using IP 2023 Cisco and/or its affiliates.All rights r
20、eserved.Cisco Public#CiscoLiveWiring determines directionOmnidirectional Add/DropChannel switched to directionROADMWestROADMEastA/DWestA/DEastWest onlyEast onlyROADMWestROADMEastOptical Switch(es)anyanyX XBRKOPT-2015 2023 Cisco and/or its affiliates.All rights reserved.Cisco Public#CiscoLiveGreen on
21、 port Colorless Add/DropRed on portROADMWestROADMEastOptical Switch(es)ROADMWestROADMEastOptical Switch(es)BRKOPT-2015 2023 Cisco and/or its affiliates.All rights reserved.Cisco Public#CiscoLiveOK,so what is the use case?Optical ProtectionBridge green to lower part of network same patch panel portOp
22、tical RestorationCompute new path(optical control plane)and change to red same portBRKOPT-2015 2023 Cisco and/or its affiliates.All rights reserved.Cisco Public#CiscoLiveIs blocking really an issue?SRRDIt can be especially in meshed networks!(Only probabilities=10%shown)BRKOPT-2015 2023 Cisco and/or
23、 its affiliates.All rights reserved.Cisco Public#CiscoLiveNegative effect on OSNR&bitrate due to CDC-1.8-1.6-1.4-1.2-1-0.8-0.6-0.4-0.20MinMedianAverageMaxReduction in OSNR due to CDC(dB)AsiaUS CoreEMEADecreased Bitrate(%of non-regen circuits)Asia3%US Core4%EMEA0%0%BRKOPT-2015 2023 Cisco and/or its a
24、ffiliates.All rights reserved.Cisco Public#CiscoLiveDoes optical restoration work for the Asia net?Of the three networks,Asia network was specifically set up for DWDM restorationRelations157Relations w/o regenerators121Relations=2 spans117117Restorable on same bitrate82Requires regenerator35X XX XOp
25、tical restoration is(by design)not fast think minute(s)BRKOPT-2015 2023 Cisco and/or its affiliates.All rights reserved.Cisco Public#CiscoLiveDoes optical restoration work for the Asia net?Of the three networks,Asia network was specifically set up for DWDM restorationRelations157Relations w/o regene
26、rators121Relations 2 spans117117Restorable on same bitrate82Requires regenerator35Relations157Relations w/o regenerators121Relations 2 spansN/ARestorable on same bitrate72Requires regenerator49X XX XOptical restoration is(by design)not fast think minute(s)BRKOPT-2015 2023 Cisco and/or its affiliates
27、.All rights reserved.Cisco Public#CiscoLiveActual Network ResultsReduced TCO with enhanced availability vs.Present mode of OperationBRKOPT-2015PMO=50%additional cost for equivalent availability to the Routed Optical Network1.00 110.66 0.490.6-0.20 0.40 0.60 0.80 1.00 1.20CostPowerRealEstateRELATIVE
28、SUMMARYRouted Optical NetworkHollow Core80,000km Long Haul80,000km Long Haul34%Cost51%Power40%Real EstateWhat about Reliability?Present Mode of OperationPresent Mode of OperationRouted Optical NetworkingRouted Optical Networking 45 Tbps traffic demandsAll IP Protection/RestorationOptical Restoration
29、 usedSaved 12000 km 12000 km of fiber(3 x LA-NYC)2023 Cisco and/or its affiliates.All rights reserved.Cisco Public#CiscoLiveRuss Whites Rule#2Mr.EIGRP“Design is an iterative process.You probably need one more iteration than youve done to get it right.BRKOPT-2015 2023 Cisco and/or its affiliates.All
30、rights reserved.Cisco Public#CiscoLiveThat EMEA network customer viewABC CD DA-PeerNSE/33/44/7/33/1/1/21/5B-PeerInternet290 400G interfaces in coreDual DWDM PlaneBRKOPT-2015 2023 Cisco and/or its affiliates.All rights reserved.Cisco Public#CiscoLiveCustomer AskSwitching to single planeFinal Solution
31、ElectricalProtection SwitchRouterTransponderOPS400G IFs290Wavelengths580#DWDM systems2 2Router400G IFs292Wavelengths292#DWDM systems1 1BRKOPT-2015 2023 Cisco and/or its affiliates.All rights reserved.Cisco Public#CiscoLive still survives complete failure at A,BBRKOPT-207Conclusion 2023 Ci
32、sco and/or its affiliates.All rights reserved.Cisco PublicIt is all about tradeoffsDesign from IP layer downPhysics Know your IP demandsSimplify DWDM networkAdd/Drop structuresIP“restoration”Design toolsBRKOPT-2015 2023 Cisco and/or its affiliates.All rights reserved.Cisco Public#CiscoLiveFill out y
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34、 in the Cisco Live Challenge for every survey completed.BRKOPT-2015 2023 Cisco and/or its affiliates.All rights reserved.Cisco PublicContinue your educationVisit the Cisco Showcase for related demosBook your one-on-oneMeet the Engineer meetingAttend the interactive education with DevNet,Capture the
35、Flag,and Walk-in LabsVisit the On-Demand Library for more sessions at www.CiscoL you#CiscoLive 2023 Cisco and/or its affiliates.All rights reserved.Cisco Public#CiscoLive38Gamify your Cisco Live experience!Get points Get points for attending this session!for attending this session!Open the Cisco Events App.Click on Cisco Live Challenge in the side menu.Click on View Your Badges at the top.Click the+at the bottom of the screen and scan the QR code:How:123438 2023 Cisco and/or its affiliates.All rights reserved.Cisco PublicBRKOPT-2015#CiscoLive