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Networks·Services·Peoplewww.geant.org
GÉANTNetworkchallenges
GuyRoberts,SeniorNetworkArchitect,GÉANT
26Sept2017
Networks·Services·Peoplewww.geant.org
• Reducecostofprovisioningcapacityontransmissionlayer
• Addressscalability/costonIP/MPLSlayer
• Synchroniseshort/mediumtermstrategywithlongerterm(postlinesystemprocurement)
• Increasemodularity– addressvendorlocking
• Optimisearchitecturetotakemaximumadvantageofrecentdisruptivetrends
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NextgenGÉANTNetworkstrategy- guidingprinciples
Networks·Services·Peoplewww.geant.org 3
Recentdisruptivetrends
• DCIboxeswithcoherentDWDM
• Openlinesystems/Alienwaves
• Merchantsiliconpacketswitching(e.g BroadcomJerichoII)
• DWDMCommoditypluggables
• Trendtowardspacketopticalintegration
• Disaggregation(softwareandhardware)
Networks·Services·Peoplewww.geant.org
• Nextgenofcommoditypluggableopticshas excellent performance• Datacentrestyle1RUstackableformfactor.• Upto6timesreductionincostovertraditionaltelecomsequipmentarchitectures
• Significantincreaseindensity andreductioninpowerconsumption• Modular– easytoscaleup• Easyupgradepathtonewtechnology
DataCentreInterconnects
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• Lossofequipmentintegrity– notdesignedtobehighlyavailableasperETSIetc.• Nointernalhardwareredundancy• Noin-serviceupgrades• Restrictedtemperatureoperation
Networks·Services·Peoplewww.geant.org 5
Reducecostofprovisioningcapacityontransmissionlayer– costcomparison
Costofprovisioningcapacityfromclienttoclientin100sofGbps viaDCIvsInfinera DTNxs – mostandleastexpensiveDCIsolutionscostsareshown– upto90%cheaperbandwidthusingCoriant solutionvsDTNx
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100G 200G 300G 400G 500G 600G 700G 800G 900G 1T 1.1T 1.2T 1.3T 1.4T 1.5T
HWcostofdeliveringcapacitybetweenadjacentPoPsoverafibrelink
DCI1 DCI2
AnalysisbyMatthewGordon
Networks·Services·Peoplewww.geant.org 6
Reducecostofprovisioningcapacityontransmissionlayer– DCIcostscomparison
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CostcomparisonDCIswith16QAM
HighvariationincostbetweenDCIsolutions
AnalysisbyMatthewGordon
Networks·Services·Peoplewww.geant.org 7
CurrentGÉANTcostpainpoints
Problemswithcurrentarchitecture:
• OTNlayerexpensive
• DTNx chassisrunningoutofslotsincentralPoPs
• OTNusefulforprotectionswitchingandmultihop buttrafficis70%unprotectedandnexthop
• OTNchassisareDCpoweredfullrackwhileDCIareACpowered1RU
• ProliferationofIP/MPLS
SlidebySebastianoBuscaglione
Networks·Services·Peoplewww.geant.org 8
GÉANTtransmission:Interimsolution
Solution
• UseDCItoprovisionbandwidthforhighcapacityIP/MPLStrunks
• DCIsareupto6xcheaperthanDTNx
• KeepDTNx forlinkmanagementandlambdaprovisioninggreatlysimplifyingDCIroleandminimisingrisk
• IntegrationofDCIallowsforgrowthoffsetandgenerateenoughsparestoallowtoceasespendingonDTNxplatform
SlidebySebastianoBuscaglione
Networks·Services·Peoplewww.geant.org
Medium-termsolution:AlienwavesoverOpenLineSystems
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• Alienwavesallowtranspondersfrommultiplevendorstooperateonasinglelinesystem.• Integrated3rdpartyDWDMpluggables availableinvariousterminaltechnologiesandvendors.• Stillbenefitfromasinglevendorprovidingend-to-endopticalmanagement:Channel&spanequalization,DCNconnectivity(OSC),ALS,Alarmreporting.
OpenLineSystem
ILAROADM ROADMILA
Networks·Services·Peoplewww.geant.org
Medium-termsolution:OpenLinesystem.
10
• Thisisthecurrentclosedmanagementmodel
• Long-termvision.Butopenstandardsandmanagementnotavailableyet
• Mediumtermsolution.Openaccess,singlemanagementplaneforOLS
Networks·Services·Peoplewww.geant.org 11
Addressscalability/costonIP/MPLSlayer
• MainfocusonshorttermisaddressingMXlinecardsfragmentationbyintroducinghigherdensitycardsincentrallocationandmovinglowerdensitycardstotheperiphery
• MX480/960platformremainsviabletill2020+• VendorsiliconbasedsolutioncomingtothemarketasviablealternativetoJuniper,howeverstill1to2yearsawayforfullL3support
• FlexE inMPC10allowsforlinkbundlingwithbitstriping– addresselephantflows• ShorttermGÉANTtoaddressmaintenancecostsofJuniperMXsbyoptimisingcardsutilisationandpursuingcostreductionstrategywithvendors
• MediumtermGEANTtotest,validateandintegratealternativetoMXs- Prouter,brite box,packetopticalintegration
Networks·Services·Peoplewww.geant.org
Thankyou
Networks·Services·Peoplewww.geant.org
12
Networks·Services·Peoplewww.geant.org13
Optimisationofcostperbitbydiversifyingdeliverystrategy
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Current Switchthrough OpticalExpress DCI/PE DCI/P DCI/P- PE DCI/P- PEOX
HWcostE
UR
Solution
Costtodeliver100GbpsClienttoClient1hop
Pushtraffictolowestpossiblelayer