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1、#CiscoLive#CiscoLiveKent Dailey and Brad RiapolovTechnical Solutions ArchitectsBRKOPT-2016Building transport grade packet-based networks with Routed Optical Networking 2023 Cisco and/or its affiliates.All rights reserved.Cisco Public#CiscoLiveEnter your personal notes hereCisco Webex App Questions?U
2、se 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 spaceHowWebex spaces will be moderated by the speaker until June 9,2023.12
3、343https:/ 2023 Cisco and/or its affiliates.All rights reserved.Cisco PublicBRKOPT-20163Agenda 2023 Cisco and/or its affiliates.All rights reserved.Cisco PublicTodays Networking LayersComplexity of Multiple Control PlanesAdvantages of Routing Control PlaneUnified Control Plane(incl sub 50ms restorat
4、ion)Customer Outcomes with SummaryBRKOPT-20164Todays Networking Layers 2023 Cisco and/or its affiliates.All rights reserved.Cisco Public#CiscoLiveMultilayer Topologies Fiber Layoutthis is the Logical Fiber Topology1211sssaCollapsed Fiber PathsBRKOPT-20166 2023 Cisco and/or its affiliates.
5、All rights reserved.Cisco Public#CiscoLiveMultilayer Topologies OLS Layout711OLS collapses from fiber BRKOPT-20167 2023 Cisco and/or its affiliates.All rights reserved.Cisco Public#CiscoLiveMultilayer Topologies Router AdjacenciesHub-and-Spoke Logical Topology711BRKOPT-20168Complexity of Multiple Co
6、ntrol Planes 2023 Cisco and/or its affiliates.All rights reserved.Cisco Public#CiscoLiveMultilayer Topologies All LayersLogical for all Layers1211sssa711711Who can keep track of this?BRKOPT-201610 2023 Cisco and/or its affiliates.All rights reserved.Cisco Public#CiscoLiveMapping Services
7、with Disparate TranspondersUse Fiber Topology to ensure route diversity of 1:1 ServiceHub-and-Spoke topology R1-R10must determine valid paths for all Router ConnectionsNone of the middle paths are useable due to fiber collapsesThese are static Optical Circuits supporting IP Services constant line ra
8、te regardless of needed Capacityno optical restoration or switchingFiber,OLS,and Router Diversities(SRLGs)must be determined/designed between each routerBRKOPT-201611 2023 Cisco and/or its affiliates.All rights reserved.Cisco Public#CiscoLiveMapping Services with Disparate TranspondersUse Fiber Topo
9、logy to ensure route diversity of 1:1 Service1211sssaAny Fiber cut reduces capacity by 50%BRKOPT-201612 2023 Cisco and/or its affiliates.All rights reserved.Cisco Public#CiscoLiveMapping Services with Disparate Transponders1211sssaOvercome with Optical Restoration 1+1+RBRKOPT-2
10、01613 2023 Cisco and/or its affiliates.All rights reserved.Cisco Public#CiscoLiveMapping Services with Disparate TranspondersFailover is easy just re-route during fault eventsNo coordination with the IP Layer Optical Restoration can restore within minutesbut this path has partial overlap with the fi
11、rst path so it must be reverted how do you keep track of the“home”paths for each?Optical Reversion is Hard auto or manual reversion optionsgenerally,auto just reverts after set time(WTR)preferably would be scheduled event(s)in coordination with the IP Layer usually,multiple circuits will revert with
12、out coordination with each otherOvercome with Optical Restoration 1+1+R1211sssaBRKOPT-201614 2023 Cisco and/or its affiliates.All rights reserved.Cisco Public#CiscoLiveNetwork Protection SchemesNone 1:11+1 1+1+RPSMIP Protection“Easily”doneDiverse Hardware and Paths50%Link UtilizationNo or
13、 little IP Layer Interaction 50ms Electrical Switching(OTN)+1 Optical Trunk/Card/HWAdditional Power,real estate,and costs Failback is not coordinated with IP LayerN-x Optical Paths available for restorationNo additional Optical Trunk(2)Requires Omni-directional,CDC HWFast Optical SwitchingMinimal Ad
14、ditional Hardware Loss of Light Switching prone to problemsFailback is not coordinated with IP LayerIP Protection is as fast as Optical SwitchingAll Paths are useableLess HardwareNew Skillset within IPDiverse Paths could have diverse HW Failback is not coordinated with IP LayerBRKOPT-201615Optical P
15、rotection SchemesOnly 2-paths for redundancyOnly 2-paths for redundancyMulti-path support if available 2023 Cisco and/or its affiliates.All rights reserved.Cisco Public#CiscoLiveRON Topology all Layers are the sameRouter Layout Physical=Logicalsss711BRKOPT-201616Advantages of Routing Control Plane 2
16、023 Cisco and/or its affiliates.All rights reserved.Cisco Public#CiscoLiveA Single Control Plane?400ZR/ZR+QSFP-DD DCO Pluggable Optics400GE Capable Router:Modular,Fixed(from 1RU1RU)75GHz min.width DWDM:ROADM,FOADM or TerminalsL3 VPNL2 VPNL1 PLE*PLE:Private Line EmulationBRKOPT-201618 2023 Cisco and/
17、or its affiliates.All rights reserved.Cisco Public#CiscoLiveA Single IP/MPLS Control PlanexHaul FabricxHaul Area 01AccessNodeEdgeNodeAccessNodexHaul Area 02P NodesIGP with SR Extensions(TI-LFA)IGP with SR Extensions(TI-LFA)IGP with SR Extensions(TI-LFA)Segment Routing/EVPNEdgeNodeCore NetworkPCEPPCE
18、PBGP-LSBGP-LSNetconf/YangNetconf/YangCore NetworkEdge Compute MECEdge ComputeMECxHaul FabricCustomerCustomerBRKOPT-201619 2023 Cisco and/or its affiliates.All rights reserved.Cisco Public#CiscoLive01020304-Complete control over forwarding path-Ingress router“forces the path”-Transit routers only nee
19、d to know how to get to a segment,not the full per-path-Segments are topology or services-based Optimized Traffic Delivery-Reduce of protocols as IGP takes over-Better network asset utilization-Minimal Control Plane Pressure Migrations do not disrupt data planeNetwork Simplification-FRR over ANY top
20、ology(LFA/RFLA)-Sub-50msec convergence-Minimize network congestionNetwork Resiliency-Can integrate with SDN Controllers for optimal path selection-Balance between distributed intelligence and centralized optimizationSDN App-Eng RoutingWhy Segment Routing?BRKOPT-201620 2023 Cisco and/or its affiliate
21、s.All rights reserved.Cisco Public#CiscoLiveDeliver Integrated Services Stateless SFC and NFV E-LAN,E-LINE,E-TREE,L3,IRB Services MulticastInteroperability Fully support IPv4 and IPv6 Simplify protocols and operations Open-Standard and Multi-VendorMulti-Homing Seamless Brownfield Integration Same pr
22、inciples and operational experience as IP VPNs All-Active Redundancy with Fast ConvergenceRoute Reflector Function Eliminate the need to establish full-mesh PE connections Reduce number of network signaling messagesWhy EVPN?EVPNEVPNFast,Resilient,Flexible Unified ServicesFast,Resilient,Flexible Unif
23、ied ServicesBRKOPT-201621 2023 Cisco and/or its affiliates.All rights reserved.Cisco Public#CiscoLiveLet us consider711BRKOPT-201622 2023 Cisco and/or its affiliates.All rights reserved.Cisco Public#CiscoLiveUtilization we see711BRKOPT-201623 2023 Cisco and/or its affiliates.All rights reserved.Cisc
24、o Public#CiscoLiveA case against G.8032 Ethernet RingsSmaller size reconvergence suffers as the ring growsShort L2 rings,star mesh not supportedCascaded rings physical disruption to stop unexplained behaviorSome locations on the ring do not have the best path to destinationNo multi-failure resilienc
25、yOptical restoration is not faster than IPNo traffic prioritization and engineeringNo security for the control planeNo measurable latency advantage(fiber latency=5 s/km)BRKOPT-201624 2023 Cisco and/or its affiliates.All rights reserved.Cisco Public#CiscoLiveUtilization we would like to see711BRKOPT-
26、201625 2023 Cisco and/or its affiliates.All rights reserved.Cisco Public#CiscoLiveIP Compared to L2 RingsUsing ALL available paths(resilience=#of Fiber paths)Any-to-Any connectivity=Aggregating traffic from any site onto the optical link and/or offloading traffic directly into any other siteOptical
27、Fiber Path=Routing TopologyEasy&flexible integration and placement of new Platforms,like Far Edge compute,cloud native BNG Built-in Fast-Convergence/Protection mechanisms (IP-FRR/TI-LFA)L3 Control Plane as Single Control Plane vs.IP/MPLS+Optical GMPLS+WSON/SSONNetwork Slicing through Segment Routing
28、-Low Latency path,Disjoint Path,Highest BW pathBRKOPT-201626 2023 Cisco and/or its affiliates.All rights reserved.Cisco Public#CiscoLiveG.8032 vs IP ComparedVLANVLAN-BasedBased SolutionsSolutionsEVPNEVPN-SRSRScale Large,flat L2 architectures dont scale VLAN tag stacking is not a manageablesolution W
29、ill scale to thousands of nodes per domain 20-bit labels yield virtually limitless tunnels and services 10s of thousands of LSPsOperations Understanding switching path will be very difficult since there is no control-plane state for services or tunnels Traffic routing will be deterministic based on
30、dynamic or explicit path selection via control plane Switching paths are easily traced using MPLS OAM toolkitAutomation Requires EMS or manual configuration and assignment(which will be error-prone and complex to manage)EVPN dynamically learns remote endpoints Programmatically define the path for th
31、e packet at the source nodeOptimization Traffic engineering with VLAN-basedswitching is very difficult if not impossible Native ECMP allows efficient use of network resources no configuration requiredFlexibility VLAN-based solutions constrained to logical hub-and-spoke or ring architectures Any arbi
32、trary topology can be supported with same resiliency and scaleReference SlideBRKOPT-201627Unified Control Plane Benefits 2023 Cisco and/or its affiliates.All rights reserved.Cisco Public#CiscoLiveInterop with Existing MPLSLets dispense with this(labels and mapping servers)SRNo SRNo SRSR12345SRLDPSRL
33、DPLDPLDPNo LDPNo LDPPrefix:1.1.1.5/32Prefix-SID:16005MappingServerBRKOPT-201629 2023 Cisco and/or its affiliates.All rights reserved.Cisco Public#CiscoLive711Multipath any available pathECMP/UECMP to use the totality of the network116006,16007,150PCENSOClient8910111312DC or Agg
34、CorePeerBRKOPT-201630 2023 Cisco and/or its affiliates.All rights reserved.Cisco Public#CiscoLiveSRLG(Fate Sharing)Shared Risk Link Groups(SRLGs)are identified by a numberLinks with the same SRLG id share a common risk(e.g.same fiber conduit)srlginterface Hun0/0/0/010 value 111120 value 2222!interfa
35、ce Hun0/0/0/110 value 222220 value 333330 value 4444!2365415050Default link metric:101.1.1.4SID 16004SRLG 11112222SRLG222233334444Hun0/0/0/0Hun0/0/0/1On Node6:BRKOPT-201631 2023 Cisco and/or its affiliates.All rights reserved.Cisco Public#CiscoLiveSRLG(Fate Sharing)SRTE can compute paths that exclud
36、es links that have specific SRLGssrlginterface Gi0/0/0/010 value 111120 value 2222!interface Gi0/0/0/110 value 222220 value 333330 value 4444!2365415050Default link metric:101.1.1.4SID 16004SRLG 11112222SRLG222233334444Gi0/0/0/0Gi0/0/0/1On Node6:segment-routingtraffic-engpolicy POLICY1color 20 end-p
37、oint ipv4 1.1.1.4candidate-pathspreference 100dynamicmetric type igpconstraintssrlgexclude 050Default link metric:101.1.1.4SID 16004On Node1:Dont use links with SRLG 1111SRLG 11112222SRLG222233334444BRKOPT-201632 2023 Cisco and/or its affiliates.All rights reserved.Cisco Public#CiscoLiveT
38、I-LFA sub 50ms restoration on any topologySimple to operate and understandAutomatically computed by the IGPOne configuration line onlyPrevents transient congestion and suboptimal routingLeverages the post-convergence path,planned to carry the traffic10001000Default metric:10A5 54Packet to 8Packet to
39、 8Packet to 8Packet to 8prefixprefix-SID(Z)SID(Z)1283Packet to 8Packet to 81600816008BRKOPT-201633 2023 Cisco and/or its affiliates.All rights reserved.Cisco Public#CiscoLiveDomain1SID-list:30102,30203SID-list:16007,16008Domain2Service Disjointness Two dynamic paths between two different pairs of(he
40、ad-end,end-point)must be disjoint from each other126757I:100Default IGP link metric:I:10I:100384I:100I:100segment-routingtraffic-engpolicy POLICY1color 20 end-point ipv4 1.1.1.3candidate-pathspreference 100dynamic pcepmetric type igpconstraintsassociation group 1 type nodesegment-routingtraffic-engp
41、olicy POLICY2color 20 end-point ipv4 1.1.1.8candidate-pathspreference 100dynamicpcepmetric type igpconstraintsassociation group 1 type nodeNode1Node6SR PCESR PCEBRKOPT-201634 2023 Cisco and/or its affiliates.All rights reserved.Cisco Public#CiscoLiveSR Traffic EngineeringEach SR Policy has a color t
42、o indicate a certain treatment(SLA,policy)Each SR Policy triplet(Headend,Color,Endpoint)is uniqueExample:Low-cost=“blue”,Low-delay=“green”steer traffic to 1.1.1.0/24 via Node4 into Low-cost SR Policy(1,blue,4)steer traffic to 2.2.2.0/24 via Node4 into Low-delay SR Policy(1,green,4)2376415(1,green,4)
43、(1,blue,4)1.1.1.0/242.2.2.0/24Low-delayLow-costBRKOPT-201635 2023 Cisco and/or its affiliates.All rights reserved.Cisco Public#CiscoLiveCircuit-style Segment RoutingPCEPseudowire provisioningTopology(BGP-LS)Utilization(SNMP,Telemetry)Pseudowire has a distinct bandwidth requirement assignedPseudowire
44、 is mapped to a SR policyHeadend routing requests a path via PCEP from a central PCEBandwidthPath constraintsThe path is encoded via a list of adjacency SIDs in the packet headerThe central PCE maintains a real time view ofThe network topology(BGP-LS)All path/bandwidth requests(PCEP)BRKOPT-201636 20
45、23 Cisco and/or its affiliates.All rights reserved.Cisco Public#CiscoLivePartitioning the network for circuit-style Services10G10G10G2G100G2G2G10G2G2G8G8G8GIP networkIP network98G8GIP partitionIP partitionCS partitionCS partitionMPLS EXP 0.7MPLS EXP 0.6MPLS EXP 7To allow Circuit Style services,the n
46、etwork is partition CS partitionIP partition Allocate one MPLS-EXP to the circuit-style partitionQoS configuration(MQC)isolates circuit traffic from IP trafficout-q CSout-q IPLink BWBRKOPT-201637 2023 Cisco and/or its affiliates.All rights reserved.Cisco Public#CiscoLiveSR Service Aware Traffic Stee
47、ringMechanism on source router to steer trafficBy default traffic uses IGP pathCan steer traffic into a SR policy or specific Flex-algosDestination TS:destination onlyFlow based TS:destination+QoS criteria 10.10.10.0/24 NH=7 colour=GREEN20.20.20.0/24 NH=7137651,green,74220.20.20.0/24(standard)10.10.
48、10.0/24(low delay)Traffic for 10.10.10.1 10.10.10.1 NH 7 NH 7 and 20.20.20.1 20.20.20.1-NH 7NH 7IGPDelay optimized10.10.10.0/2420.20.20.0/24RR137651,green,742IGPDelay optimized10.10.10.0/24 FC120.20.20.0/24 FC0Ingress classification DSCP=EF FC=1 GreenDSCP=AFxx FC=0 IGP Traffic for 10.10.10.1 10.10.1
49、0.0/24EF=Low delay Everything else IGPDestination basedDestination basedFlow basedFlow basedBRKOPT-201638Demo Time!Demo Time!Customer Outcomes 2023 Cisco and/or its affiliates.All rights reserved.Cisco Public#CiscoLive42BRKOPT-20169.6 km12.2 km11.4 km18.1 km23.5 km31.4 km5.8 km22.1 km17.3 km33.6 km1
50、9.3 km20.6 km14.5 km0.8 km27.1 km5.8km21.9 km5.5 kmDWDM optics4.5 kmRoute Reflectors Fusion Routers1.6 km18 km2 kmExample0.9 km 2023 Cisco and/or its affiliates.All rights reserved.Cisco Public#CiscoLive43BRKOPT-2016Benefits and ChallengesReduce cost to scale to high speeds (10/100GE)Reduce transpor
51、t power requirementsManage one network,not twoNetwork-wide Automation with OpenConfigTechnicalBusinessTechnical designOrganizationalCommercial 2023 Cisco and/or its affiliates.All rights reserved.Cisco Public#CiscoLiveFinal thoughtsIP Restoration/Protection has enhanced capabilitiesThese capabilitie
52、s are inherent to IP nothing new here!No interaction between Optical and IP Protection schemesDriving towards simpler NetworksSingle Topology of Fiber=OLS=Routing TopologyReduced Hardware Easier to automate vs.coordinate across multiple-layersBRKOPT-201644 2023 Cisco and/or its affiliates.All rights
53、 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)!These points help you get on the leaderboard and increase your chances of winning daily and grand
54、 prizesAttendees will also earn 100 points in the Cisco Live Challenge for every survey completed.BRKOPT-201645 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 Flag,and Walk-in LabsVisit the On-Demand Library for more sessions at www.CiscoL you#CiscoLive#CiscoLive