SP網絡的趨勢和拓撲選項-在提供商領域采用Webscale技術.pdf

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1、#CiscoLive#CiscoLiveLJ Wobker,Principal TMEljwobkerBRKSPG-2355Adapting Webscale Technologies in the Provider UniverseTrends&TopologyOptions for SP Networking 2023 Cisco and/or its affiliates.All rights reserved.Cisco Public#CiscoLiveEnter your personal notes hereCisco Webex App 3Questions?Use Cisco

2、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 spaceHowWebex spaces will be moderated by the speaker until June 9,2023.12343https:

3、/ 2023 Cisco and/or its affiliates.All rights reserved.Cisco PublicBRKSPG-2355Agenda 2023 Cisco and/or its affiliates.All rights reserved.Cisco PublicIntroductionHow does web run networks?Topology discussionRouting systems-abstracted“Service scale”vs.“bandwidth scale”ConclusionBRKSPG-23554 2023 Cisc

4、o and/or its affiliates.All rights reserved.Cisco Public#CiscoLiveAbstract-or your chance to drop the classThe rise of web-or hyperscale-networks,has fundamentally changed the networking space.Combinations of applications,system designs,and network topologies have been deployed at sizes and scale un

5、fathomable just a few years back.Should providers be building big leaf-spine topologies?Do we still need large linecard based modular systems?This session discusses the advantages and disadvantages of different device designs and topologies,and how they apply(or sometimes dont apply!)to the provider

6、 space.There will be some quantitative analysis(“is thing X or thing Y cheaper or lower power?”)as well as some less objective metrics and even some outright opinions begging to be challenged.5BRKSPG-2355Whats web-scale,anyway?2023 Cisco and/or its affiliates.All rights reserved.Cisco Public#CiscoLi

7、veWeb-scale networksMassiveVirtualizedDivide and ConquerLayeredParallel7BRKSPG-2355 2023 Cisco and/or its affiliates.All rights reserved.Cisco Public#CiscoLiveProvider networksMassiveVirtualizedDivide and ConquerLayeredParallel8BRKSPG-2355 Not nearly so,if at all Less so,if at all Often:combine and

8、suffer Flattened Collapsed and path-y 2023 Cisco and/or its affiliates.All rights reserved.Cisco Public#CiscoLiveWebifying provider networks.MassiveVirtualizedDivide and ConquerLayeredParallelwhat sorts of web-ish things.9BRKSPG-2355(Not as)massiveVirtualize where you canunderutilized!also:underutil

9、ized.similar but at smaller scaleTopologies 2023 Cisco and/or its affiliates.All rights reserved.Cisco Public#CiscoLiveClos was the Datacenter Choice11BRKSPG-2355https:/www.nanog.org/meetings/nanog55/presentations/Monday/Lapukhov.pdf 2023 Cisco and/or its affiliates.All rights reserved.Cisco Public#

10、CiscoLivePotential for Massive Scale12BRKSPG-2355“hundreds of thousands of 10G-connected servers”“multi-petabit bisection bandwidth”https:/ Data Center Fabric 2023 Cisco and/or its affiliates.All rights reserved.Cisco Public#CiscoLiveFabrics Come in All Shapes&Sizes.13BRKSPG-2355ABABNPU FabricNPU Fa

11、bricChassis FabricChassis FabricData Center FabricData Center FabricExternalExternalInternalInternalAB 2023 Cisco and/or its affiliates.All rights reserved.Cisco Public#CiscoLiveTopologies:meshesMeshes can be damn near anything.Often(much?)less regularCan be full or partialSparseness is incredibly i

12、mportant to how we use these things!Often follow“human”topologiesGeographyPopulationOur meshes often grow more“organically”BRKSPG-235514 2023 Cisco and/or its affiliates.All rights reserved.Cisco Public#CiscoLive15BRKSPG-2355Web networks are all fabrics.SP networks are all meshes.2023 Cisco and/or i

13、ts affiliates.All rights reserved.Cisco Public#CiscoLive16BRKSPG-2355Web networks are all fabrics.SP networks are all meshes.NONOSystems 2023 Cisco and/or its affiliates.All rights reserved.Cisco Public#CiscoLive3 Chassis typesvery broadly speaking,routers almost always look like one of these.18BRKS

14、PG-2355NPUCPUOptics2 RP/SCQ100CPUNPUCPUPCPUOpticsPPPCPUOpticsPPPCPUOpticsPPPCPUOpticsPPCPUCPUPCPUOpticsPPPCPUOpticsPPPCPUOpticsPPPCPUOpticsPLC(4-18)Fabric(8)2023 Cisco and/or its affiliates.All rights reserved.Cisco Public#CiscoLive-LJ Wobker,with apologies to Leo Tolstoy“All single-NPU systems are

15、alike.All distributed systems are distributed in their own way.”19BRKSPG-2355 2023 Cisco and/or its affiliates.All rights reserved.Cisco Public#CiscoLiveA simple fixed routing system.20BRKSPG-2355“Router”NPU(w/internal fabric)CPUNetwork OSP P P P P P P Prouting protocols,managementruns NOS code,prog

16、rams NPU forwarding/feature statedata plane.moves packets,implements featurespackets in,packets out 2023 Cisco and/or its affiliates.All rights reserved.Cisco Public#CiscoLiveThe parts of a big router.abstractedBRKSPG-235521 2023 Cisco and/or its affiliates.All rights reserved.Cisco Public#CiscoLive

17、A network of routersalso:how you sound smart to your boss talking about disaggregationBRKSPG-235522 2023 Cisco and/or its affiliates.All rights reserved.Cisco Public#CiscoLiveA bunch of routers,in a fabricBRKSPG-235523 2023 Cisco and/or its affiliates.All rights reserved.Cisco Public#CiscoLiveA dist

18、ributed router.BRKSPG-235524 2023 Cisco and/or its affiliates.All rights reserved.Cisco Public#CiscoLiveTakeaway:scaling!N*fixed scales servicesN*linecards scale bandwidthnothing scales both(without substantial tradeoffs.)BRKSPG-235525Distributions.2023 Cisco and/or its affiliates.All rights reserve

19、d.Cisco Public#CiscoLive-every executive,at every network operator,everywhere(and,the bane of our collective existences)I want you to figure out a way to run the I want you to figure out a way to run the network,delivering more bandwidth and network,delivering more bandwidth and more services,but at

20、 a lower total cost.more services,but at a lower total cost.This should be easy,so just let me know This should be easy,so just let me know when youre done.when youre done.27BRKSPG-2355 2023 Cisco and/or its affiliates.All rights reserved.Cisco Public#CiscoLiveSimple math.cost calculatorWhat I think

21、 most of us have been using as the formula:28BRKSPG-2355 2023 Cisco and/or its affiliates.All rights reserved.Cisco Public#CiscoLiveSimple math.cost calculatorWhat I think most of us have been using as the formula:29BRKSPG-2355cost=bandwidth*some_loaded_cost_per_gigabit 2023 Cisco and/or its affilia

22、tes.All rights reserved.Cisco Public#CiscoLiveSimple math.cost calculatorWhat I think most of us have been using as the formula:What I think most of us should be using as the formula:30BRKSPG-2355cost=bandwidth*some_loaded_cost_per_gigabit 2023 Cisco and/or its affiliates.All rights reserved.Cisco P

23、ublic#CiscoLiveSimple math.cost calculatorWhat I think most of us have been using as the formula:What I think most of us should be using as the formula:31BRKSPG-2355cost=bandwidth*some_loaded_cost_per_gigabitcost=bandwidth*some_loaded_cost_per_gigabitPLUSnumber_of_services*some_loaded_cost_per_servi

24、ce 2023 Cisco and/or its affiliates.All rights reserved.Cisco Public#CiscoLiveWhy?1.Bandwidth was a reasonable proxy for cost.2.The distributions of bandwidth vs.services were not particularly wide.3.Profit!32BRKSPG-2355 2023 Cisco and/or its affiliates.All rights reserved.Cisco Public#CiscoLiveWhy?

25、1.Bandwidth was a reasonable proxy for cost.a)But not anymore.2.Distributions of bandwidth vs.services werent particularly wide.a)But not anymore.3.Profit!a)Pricing and delivery models cannot stray too far from cost models.33BRKSPG-2355 2023 Cisco and/or its affiliates.All rights reserved.Cisco Publ

26、ic#CiscoLiveThe network operators most important ratio.Features vs.bandwidthOr:“service plane vs data plane (*)“service plane includes stuff like:peers,routes,labels,interfaces.but ALSO:counterspolicieslayers/encapsMaybe:anything thats not just moving bits is service-plane?34BRKSPG-2355Fancy charts.

27、2023 Cisco and/or its affiliates.All rights reserved.Cisco Public#CiscoLiveProvider-like distributions36BRKSPG-2355#of serviceslow high service speedservice speed#of serviceslow high service speedservice speed 2023 Cisco and/or its affiliates.All rights reserved.Cisco Public#CiscoLiveWeb-like distri

28、butions37BRKSPG-2355#of serviceslow high service speedservice speed#of serviceslow high service speedservice speed 2023 Cisco and/or its affiliates.All rights reserved.Cisco Public#CiscoLiveDistribution of service speedsThe distributions of service bandwidth matter.They matter MUCH more than the“ave

29、rage bandwidth”Do any of these look like yours?Do you have a Really Good Idea what yours looks like?38BRKSPG-2355 2023 Cisco and/or its affiliates.All rights reserved.Cisco Public#CiscoLive-something I really think you should be thinking aboutEven more important:do you have a Really Good Idea what y

30、our distribution is.next year.in 3 years?.5 years?39BRKSPG-2355Contentions 2023 Cisco and/or its affiliates.All rights reserved.Cisco Public#CiscoLiveI shall contend.(operator side)Bandwidth continues to grow,but slowing.BUT-bandwidth growth is unevenly distributedThe gap between the fast and slow c

31、ontinues to widenNow multi gigabit and multi kilobit Zipf/power law like distributionscontinued stretch between fast and slow41BRKSPG-2355Bandwidth#of ports 2023 Cisco and/or its affiliates.All rights reserved.Cisco Public#CiscoLiveI shall further contend.(vendor side)MSDC will drive astonishing ban

32、dwidth/density improvementsSilicon will get leaner“(at least comparatively.)Fixed systems will become increasingly relevantOptics-to-OtherStuff price ratio will continue to widenRate of new systems to consume will increase42BRKSPG-2355 2023 Cisco and/or its affiliates.All rights reserved.Cisco Publi

33、c#CiscoLiveThe generic SP network diagram43BRKSPG-2355This is a meshy,expensive,irregular,transport-ishlooking thing.2023 Cisco and/or its affiliates.All rights reserved.Cisco Public#CiscoLiveZoom in some.44BRKSPG-2355This is a meshy,expensive,irregular,transport-ish looking thing.XXXBox ABox BBox C

34、The people who pay your salaries are down here.2023 Cisco and/or its affiliates.All rights reserved.Cisco Public#CiscoLiveDo you do this?It hurts when you do this.This is a meshy,expensive,irregular,transport-ish looking thing.XXXBox ABox BBox CThe people who pay your salaries are down here.BRKSPG-2

35、35545Business trends,design thoughts.2023 Cisco and/or its affiliates.All rights reserved.Cisco Public#CiscoLive47Web as SP or SP as WebBRKSPG-2355This is a meshy,expensive,irregular,transport-ish looking thing.X1X2XnBox ABox BBox CSize this day-one.Dont run out!(This is much less painful than this

36、used to be,due to a combination of business and technology reasons)The people who pay your salaries are down here.2023 Cisco and/or its affiliates.All rights reserved.Cisco Public#CiscoLiveExpanding the network part over time.This is a meshy,expensive,irregular,transport-ish looking thing.XXXBox ABo

37、x CThe people who pay your salaries are down here.Super important:You do NOT have to know how many A vs C boxes you need on day-one.If you have free space at the top(“spines”),its trivial to scale A/B/C later(“leafs”).In whatever ratios whatever ratios you end up needing(!)And-its easy/cheap to chan

38、gechangethem later.C?C?B?B?A?BRKSPG-235548 2023 Cisco and/or its affiliates.All rights reserved.Cisco Public#CiscoLiveA possible summary.Transport is expensiveexpensive,so optimize here.Red links are NOT:dont worry as muchPick how much“box complexity you need.NOT A PRESCRIPTION FOR:A specific number

39、 of levels/layers(agg below is fine)A specific boxes:fixed/modular,(non)-redundantA specific vendor(though we have a preference.)49BRKSPG-2355 2023 Cisco and/or its affiliates.All rights reserved.Cisco Public#CiscoLive50A shift in mix of service speeds over time?BRKSPG-2355az.yxwcb 2023 Cisco and/or

40、 its affiliates.All rights reserved.Cisco Public#CiscoLiveAnd the business impacts of that shift.Align service offerings with where your growth isCP:DP ratios range:going from low-to-high to tiny-to-giganticOpen question:does the middle exist in 5 years?BRKSPG-235551 2023 Cisco and/or its affiliates

41、.All rights reserved.Cisco Public#CiscoLiveFill out your session surveys!Attendees who fill out a minimum of four session surveys and the overall event survey will get Cisco Live-branded socks(while supplies last)!52BRKSPG-2355These points help you get on the leaderboard and increase your chances of

42、 winning daily and grand prizesAttendees will also earn 100 points in the Cisco Live Challenge for every survey completed.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 meetingAtt

43、end the interactive education with DevNet,Capture the 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#CiscoLive55Gamify your Cisco Live experience!Get points Get points for attending this

44、 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:123455 2023 Cisco and/or its affiliates.All rights reserved.Cisco PublicBRKSPG-2355#CiscoLive