Application Engineered Routing: Allowing Applications to Program the Network

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2 BRKSPG-2066 Application Engineered Routing: Allowing Applications to Program the Network Rob Piasecki Senior Solutions Architect, Services - rpiaseck@cisco.com Matt Birkner Distinguished Services Engineer, Services mbirkner@cisco.com

3 Cisco Spark How Questions? Use Cisco Spark to communicate with the speaker after the session 1. Find this session in the Cisco Live Mobile App 2. Click Join the Discussion 3. Install Spark or go directly to the space 4. Enter messages/questions in the space cs.co/ciscolivebot#brkspg Cisco and/or its affiliates. All rights reserved. Cisco Public

4 Agenda AER: Industry Drivers & Overview AER: Architecture & Technical Concepts Segment Routing Intelligent SDN Controller Use Cases & Implementation Purpose Built Applications Demo Conclusion

5 AER: Industry Drivers & Overview

6 The Problem The Network is Facing New Challenges Cloud Services IoE Mobility UHD Dynamic and changing traffic patterns Increasingly diverse applications with application-specific transport requirements Other End-to-End control required IPv6 EVOLVED PROGRAMMABLE NETWORK BRKSPG Cisco and/or its affiliates. All rights reserved. Cisco Public 6

7 Petabytes per Month Growing Traffic, Growing Opportunity IP Data Growth: Increasingly More Mobile* Traffic is Moving Closer to the End User* 300, ,000 Mobile data (46% CAGR) 200,000 Managed IP (13% CAGR) 150, ,000 50,000 Fixed Internet (23% CAGR) Consumer (24%CAGR) Business (21% CAGR) Opportunity for Growth* Automation is the Key to Cutting Costs x Zettabytes Global IP traffic per year in 2016 Zettabytes Global IP traffic per year in 2020 =$2 trillion Increase Global mobile data traffic by 2020 At stake for Service Providers between now and 2024 *Cisco Visual Networking Index Forecast and Methodology, BRKSPG Cisco and/or its affiliates. All rights reserved. Cisco Public 7

8 Networks Need to be Rethought Applications and Network Interaction is Key IP Core APPLICATIONS Edge EVOLVED SERVICES PLATFORM Acce ss/ Agg IPv6 EVOLVED PROGRAMMABLE NETWORK IP NGN Era Designed to support a set of services Static traffic patterns Designed to support any kind of services Dynamic traffic patterns Manual configuration (CLI) Apps Independent of Network Automation (APIs, Controllers, ) App & Network Interaction BRKSPG Cisco and/or its affiliates. All rights reserved. Cisco Public 8

9 Specific Approaches to the Problem A Continuum of Enhanced Solutions Hosts DC Core Agg Hosts DC Core Agg Hosts DC Core Agg One device, single domain Many devices, single domain Many devices, across domains IP NGN Era EPN Era Policy-Based routing MPLS TE Effective solutions with some caveats: Little or no application / network interaction Scalability Configuration & troubleshooting complexity States to be maintained in each network node Evolution required to address the new paradigm Scalable Stateless Programmable Ease of configuration & troubleshooting BRKSPG Cisco and/or its affiliates. All rights reserved. Cisco Public 9

10 End To End Limitations Provider Constraints What s Needed Too Many Manual Steps Fragmented View of the WAN Lack of Visibility for Troubleshooting WAN Lacks Real-Time Agility Service Providers adopting new approaches Multivendor Orchestration Unified WAN View for Scenario Analysis Network Visibility Over Time: Past, Present, and Future Automation at Scale BRKSPG Cisco and/or its affiliates. All rights reserved. Cisco Public 10

11 The Solution Application Engineered Routing Applications express requirements bandwidth, latency, interactive Applications Applications are mapped to a path defined by a list of segments SDN Controller The controller collects data from the network topology, link states, link utilization, Segment Routing (SW upgrade) Network maintains segments only No application state BRKSPG Cisco and/or its affiliates. All rights reserved. Cisco Public 11

12 Examples of Applications Bandwidth Calendaring Automated Assurance BGP Analytics App Network Modeling APP WAE Design APP Optimization and Predication APPS Plan, Analyze, Control Network as a Service * Custom APPS using extensive API library BRKSPG Cisco and/or its affiliates. All rights reserved. Cisco Public 12

13 Application Engineered Routing Evolve MPLS with Segment Routing Mission Route the luggage to Berlin Segment Routing RSVP-TE Seattle Toronto New-York London Madrid Berlin 1. A luggage tag is attached with the final destination 2. Luggage identified and routed to the next destination IP/LDP Mexico TXL RESULT: No control over the path Luggage is routed over the shortest path BRKSPG Cisco and/or its affiliates. All rights reserved. Cisco Public 13

14 Application Engineered Routing Evolve MPLS with Segment Routing Mission Route the luggage to Berlin via Mexico and Madrid Segment Routing RSVP-TE Seattle Toronto New-York London Madrid Berlin 1. At each stop, the luggage is identified and routed to the next hop A list of all the paths has to be maintained IP/LDP Mexico SEA MEX A specific tag is assigned to each piece of luggage, i.e. Tunnel ID 20000, is created to identify the path Seattle-Mexico-Madrid-Berlin MAD TXL MEX MAD RESULT: Path can be controlled Complexity and scalability issues BRKSPG Cisco and/or its affiliates. All rights reserved. Cisco Public 14

15 Application Engineered Routing Evolve MPLS with Segment Routing Mission Route the luggage to Berlin via Mexico and Madrid Segment Routing RSVP-TE Seattle Toronto New-York London Madrid Berlin 1. A unique and global luggage tag is attached to the luggage with the list of stops to the final destination IP/LDP Mexico MEX MAD TXL 2. At each stop, the luggage is simply routed to the next hop listed on the luggage tag MAD TXL TXL RESULT: Path can be controlled Simple and scalable BRKSPG Cisco and/or its affiliates. All rights reserved. Cisco Public 15

16 Application Engineered Routing Segment Routing Technical View Path expressed in the packet Data Data Plane Dynamic path MPLS (segment labels) IPv6 (+SR header) Control Plane Routing protocols with extensions (IS-IS,OSPF, BGP) SDN controller Explicit path Paths options Dynamic (STP computation) Explicit (expressed in the packet) BRKSPG Cisco and/or its affiliates. All rights reserved. Cisco Public 16

17 Understanding Today s Service Creation Limited Cross-domain Automation Metro Network Domain Core Network Domain Data Center Domain L2VPN L3VPN VXLAN VNF VNF Aggregation Access HW Appliances Ethernet MPLS IP Centralized Delivery of Services E2E service provisioning is lengthy and complex: Multiple network domains under different management teams Manual operations Heterogeneous Underlay and Overlay networks BRKSPG Cisco and/or its affiliates. All rights reserved. Cisco Public 17

18 Unified Network as a Fabric for Service Creation Controller Access Metro Network Domain Core Network Domain Data Center Domain EVPN VNF VNF VNF VNF Segment Routing Compute Leaf Spine Simplify Unified underlay and overlay networks with segment routing and EVPN Automate E2E Cross-domain automation with model-driven programmability and streaming telemetry Virtualize Enable distributed service delivery and speed up service creation BRKSPG Cisco and/or its affiliates. All rights reserved. Cisco Public 18

19 Consolidate Service and Transport using SRv6 Homogenous Cross-domain Automation SDN SDN SDN Metro Network Domain Core Network Domain Data Center Domain Aggregation SRV6 Transport and VPN L2/L3 VNF VNF Access HW Appliances Centralized Delivery of Services Simplify Further by Combining Service and Transport SRv6 Transport and Services both built into the IPv6 header Unified Transport and Services Multiple network domains under same management teams Automate Operations BRKSPG Cisco and/or its affiliates. All rights reserved. Cisco Public 19

20 Application Engineered Routing Solution Components Network Applications Bandwidth calendaring Low-latency path selection Disjoint recovery path 3 rd -party applications Northbound interfaces RESTful APIs ESP WAE NSO XTC 3 rd -party controller Southbound interfaces Netconf/Yang BGP LS PCEP Configlets Segment Routing (SR) across Cisco platforms EPN ASR 9K ASR 1K NEXUS 9000 VNF 3 rd -party platforms supporting SR NCS 6K NCS 5K Physical Virtual BRKSPG Cisco and/or its affiliates. All rights reserved. Cisco Public 20

21 Application Engineered Routing Journey Adding Value at Your Own Pace Enable Segment Routing on EPN Platforms (Software only) Insert ESP components Orchestration, SDN controller Benefits Network Simplification Connect with Cisco s and third party VNFs Network Resiliency End-User Experience Network Optimization Service Velocity E2E Application Control BRKSPG Cisco and/or its affiliates. All rights reserved. Cisco Public 21

22 Architecture & Technical Concepts: Segment Routing

23 Segment Routing Unified DC + WAN + Aggregation From server in the DC, through WAN and to the service edge Policy-aware DC: disjoint planes, flow-based congestion avoidance WAN: disjoint services, latency-sensitive traffic, scheduled bulk transfer Application programs the end-to-end policy The end-to-end policy is encoded by the application as an SR segment list in the packet header Balance between distributed and centralized intelligence Distributed: automated sub-50msec FRR link/node in any topology with optimum backup path Centralized: traffic optimization for better use of the installed capacity Applicable to MPLS and IPv6 data-planes Much simpler to operate than MPLS Classic Segment Routing (SW upgrade) BRKSPG Cisco and/or its affiliates. All rights reserved. Cisco Public 23

24 Segment Routing Source Routing: the source chooses a path and encodes it in the packet header as an ordered list of segments. Segment: an identifier for any type of instruction Service Context Locator IGP-based forwarding construct Segment = Instructions such as "go to node N using the shortest path" BGP-based forwarding construct Local value or Global Index BRKSPG Cisco and/or its affiliates. All rights reserved. Cisco Public 24

25 Segment Routing MPLS: an ordered list of segments is represented as a stack of labels SR re-uses MPLS data-plane without any change IPv6: an ordered list of segments is represented as a routing extension header, see 4.4 of RFC2460 IGP-based segments require minor extension to the existing link-state routing protocols (OSPF and IS-IS). BRKSPG Cisco and/or its affiliates. All rights reserved. Cisco Public 25

26 IGP Segments Node segment to C A B C D Node segment to C Adj Segment Z M N O P Simple extension to let IGP install segments in the MPLS dataplane Excellent Scale: a node installs N+A FIB entries N node segments and A adjacency segments Node segment to Z BRKSPG Cisco and/or its affiliates. All rights reserved. Cisco Public 26

27 Node Segment FEC Z push swap to swap to pop Packet to Z A B C Packet to Z Packet to Z Packet to Z D Z Packet to Z A packet injected anywhere with top segment will reach Z via shortest-path Z advertises a global node segment with its loopback Simple ISIS sub-tlv extension Default SRGB [16000, 23999] at all nodes is a request from all lead operators for operational simplicity. The protocol and implementation allows for different SRGB at every node All remote nodes install in their FIB the node segment to Z BRKSPG Cisco and/or its affiliates. All rights reserved. Cisco Public 27

28 Node Segment A B C D Z M N O P ECMP A node segment to distributes traffic across all ECMP paths to O BRKSPG Cisco and/or its affiliates. All rights reserved. Cisco Public 28

29 Adjacency Segment A B C M N O Pop D P Z A packet injected at node C with segment is forced through datalink C-O C allocates a local segment and maps it to the instruction complete the segment and forward along the interface CO C advertises the adjacency segment in ISIS Simple sub-tlv extension C is the only node to install the adjacency segment in FIB BRKSPG Cisco and/or its affiliates. All rights reserved. Cisco Public 29

30 Explicit Path as Segment List ECMP Node segment Per-flow state only at head-end Not at mid-points Source Routing Path state is in the packet header Packet to Z Packet to Z Packet to Z A B C M N O Packet to Z D P Packet to Z Z Packet to Z BRKSPG Cisco and/or its affiliates. All rights reserved. Cisco Public 30

31 Automated 50-msec Protection for IGP Segments Guaranteed Link/Node/SRLG FRR in any topology 50-msec protection Simplicity Entirely automated No directed LDP session No RSVP-TE tunnels Incremental deployment Optimal backup path along post convergence path Prevents transient congestion and suboptimal routing BRKSPG Cisco and/or its affiliates. All rights reserved. Cisco Public 31

32 SR-based MPLS Classic MPLS Basic mpls transport IGP IGP + LDP IGP/LDP synchronization N/A Problem to manage 50msec FRR IGP IGP + RSVP-TE Extra TE states to support FRR No extra state Extra states to manage Optimum backup path Yes (IP post-convergence) No (SDH-alike) ECMP-capability for TE Yes No TE state only at headend Yes No (n^2 problem at midpoint) Seamless Interworking with classic MPLS and incremental deployment Yes N/A Engineered for SDN Yes No BRKSPG Cisco and/or its affiliates. All rights reserved. Cisco Public 32

33 Segment Routing Summary IP/MPLS architecture that seeks the right balance between distributed intelligence and centralized optimization and programming. simplifies operation (lower opex) enables application-based service creation (new revenue) allows for better utilization of the installed infrastructure (lower capex) An IP/MPLS architecture with wide application (SP, OTT/Web, GET) across (WAN, Metro/Agg, DC) MPLS and IPv6 data-planes SDN controller An architecture designed with SDN in mind BRKSPG Cisco and/or its affiliates. All rights reserved. Cisco Public 33

34 Architecture & Technical Concepts: Intelligent SDN Controller

35 SDN Strategy for SPs High-Level View Model driven, end-to-end service lifecycle and customer experience focus Seamless integration with existing and future OSS/BSS environment Loosely-coupled and modular architecture using open APIs and standard protocols BSS OSS (Fulfillment and Assurance) Service-Intent API Orchestration, Service, and Policy Implementation Branch, CPE Control CLI, SNMP Netconf, YANG Data Center Multi-layer WAE, XTC and NFV WAN SDN Control SDN / APIs BGP Segment Routing PCEP EMS, NMS Openflow Openstack, vcenter CPE Metro and Access WAN Data Centre Orchestration across multiple domains and layers provides centralized policy and services across the entire network Multi-Vendor End-to-End Management and Orchestration (Physical and Virtual) BRKSPG Cisco and/or its affiliates. All rights reserved. Cisco Public 35

36 Network Service & Transport Orchestration NSO YANG YANG NSO NSO YANG YANG YANG NSO YANG Config on Router Config on Router Config on Router Hierarchical SDN Map Network Service Signaling BGP VPN on Router BGP RR BGP RR IGP, BGP LS BGP RR BGP RR s plane VPN on Router Network Transport Signaling TE on Router PCEP PCE-Ctrl PCE-Ctrl PCE-Ctrl IGP, BGP LS PCE-Ctrl PCEP PCE s plane TE on Router BRKSPG Cisco and/or its affiliates. All rights reserved. Cisco Public 36

37 Path Computation Element (PCE) Ecosystem XTC or XR Transport Controller: Runs as IOS-XR feature Collect topology: BGP, ISIS, OSPF and BGP Link-State Deploy tunnel: PCEP SR/RSVP, BGP SR-TE Compute: reachability, disjoint paths, low latency, avoidance North Bound interface with application: NETCONF/YANG, grpc,.. WAE or WAN Automation Engine: Runs as an application with integration with XTC Collect topology via XTC Collect telemetry: FNF, Streaming Telemetry, SNMP Deploy tunnel via XTC (preferred: stateful) or NSO (optional: stateless) Compute: Bandwidth Optimization, What if analysis, Pro/Re-active capacity planning BRKSPG Cisco and/or its affiliates. All rights reserved. Cisco Public 37

38 WAN Automation Engine Evolution: Delivering Optimization and Automation Predictive Model Time Series Visibility Path Activation Dynamic SLA Management + + = WAE Cycle Modeling What-If predictive analysis Global optimization Assess historical and real-time data Find and manage hot spots Network efficiency analysis Programmatic network control Model-driven Path Activation Monitor for path constraint violations Automate network changes to ensure path compliance BRKSPG Cisco and/or its affiliates. All rights reserved. Cisco Public 38

39 WAN Automation Engine WAE Design WAE Analytics Coordinated Maintenance NSO 3rd Party Apps BW Calendaring Partner Apps Service Interface APIs WAN Automation Engine Optimization and Prediction Module Network Model Manager Collector Network Interface Module (NIMO) Deployer SNMP NetFlow BGP-LS Telemetry Optical Plug-In NMS/EMS NSO Device Mgr PCEP Controller Plug-In Builds Multi-Vendor Network Topology and Traffic Model BRKSPG Cisco and/or its affiliates. All rights reserved. Cisco Public 39

40 WAN Automation Applications Offline Planning IGP Convergence Analyzer Failure Analysis BGP Route Visualizer Weather Map Business Intelligence Inventory Maintenance Window Scheduler Network ACL Manager Offline Planning, Design, and Analysis Online Visualization, Analytics, and Business Intelligence Managed Resource Inventory, Security, and Maintenance Bandwidth on Demand Bandwidth Calendaring Segment Routing Optimizer Application Latency Routing Tunnel Builder Tunnel Splitter Tunnel Balancer Optimized Bandwidth Placement Extensible Application Integration Automated Tunnel Creation and Traffic Load Management BRKSPG Cisco and/or its affiliates. All rights reserved. Cisco Public 40

41 WAE Strategic Initiatives WAE Architecture, Applications and APIs YANG Run-time, Coordinated Maintenance, Analytics Segment Routing Built for SDN Foundation for application-engineered routing applications that will have the ability to direct network behavior Data Center A Data Center B NSO WAE XTC Integration Traffic-aware intelligent programmability of multi-vendor networks Unified Multilayer Global network view Optimization across layers Future: Add OTN to activation, planning, and optimization BRKSPG Cisco and/or its affiliates. All rights reserved. Cisco Public 41

42 XR Transport Controller (XTC) XR-powered Stateful Path Computation Element (PCE) XTC functionality is available on virtual IOS XR node Multi-Domain: Real-time topology collection via BGP-LS or IGP Computes inter-area/domain/as paths Stateful: Takes control of SRTE Policies Updates SRTE Policies when required BRKSPG Cisco and/or its affiliates. All rights reserved. Cisco Public 42

43 XR Transport Controller (XTC) XTC runs as IOS XR feature deployed as a virtual machine (VM) instance on x86 server UCS server recommended Virtual device Cisco IOS XR - XRv 9000 XRV9000 image VRR License + XTC License IOS XRv 9000 HyperVisor Physical HW (x86) BRKSPG Cisco and/or its affiliates. All rights reserved. Cisco Public 43

44 PCE Ecosystem: XTC + WAE NSO Telemetry based Automation UI Path Computation X-Domain Topology WAE XTC PCEP Netconf/Yang grpc XTC XTC XTC PCEP AC10 AC19 Access 1 OSPF ASBR 1 ASBR 2 ASBR 3 ASBR 4 RR Core ISIS 1 BGP LS ABR5 ABR6 Access 2 ISIS 2 AC20 AC29 BRKSPG Cisco and/or its affiliates. All rights reserved. Cisco Public 45

45 Path Computation Distributed or Centralized? Policy Single-Domain Multi-Domain Reachability IGPs BGP or Centralized Low Latency Distributed or Centralized Centralized Disjoint from same node Distributed or Centralized Centralized XTC Disjoint from different node Centralized Centralized Avoiding resources Distributed or Centralized Centralized On demand BW Distributed or Centralized Centralized BW optimization Maintenance Distributed or Centralized Centralized WAE BRKSPG Cisco and/or its affiliates. All rights reserved. Cisco Public 46

46 Use Cases & Implementation: SR Use Cases

47 IPv4 MPLS Transport with FRR A B PE1 PE2 M N Any service resolving on IGP IPv4 Prefix SID Internet VPNv4 6PE All VPN services ride on the prefix segment to PE2 PW IPv4 over MPLS: the obvious way it should have been done Just the IGP to operate Sub-50-msec FRR integrated and automated Seamless migration SR/LDP interworking BRKSPG Cisco and/or its affiliates. All rights reserved. Cisco Public 48

48 IPv6 MPLS Transport with FRR A B PE1 PE2 M N Any service resolving on IGP IPv6 Prefix SID Internet v6 VPNv6 Internet/v6 rides on the Prefix segment to PE2 IPv6: the opportunity to do it right from the start Just the IGP to operate Sub-50-msec FRR integrated and automated BRKSPG Cisco and/or its affiliates. All rights reserved. Cisco Public 49

49 MPLS Data-Plane Monitoring 9107 B C A OAM 9102 N O 9104 draft-geib-spring-oam-usecase-02 Nanog57, Feb 2013 BRKSPG Cisco and/or its affiliates. All rights reserved. Cisco Public 50

50 Disjoint TE Service A to Z any plane IGP shortest-path Prefix SID of Z (16065) pkt A to Z via blue plane SRTE policy pushes one additional segment Blue Anycast (16111) Benefits ECMP No hop-by-hop signaling load and delay No midpoint state pkt BRKSPG Cisco and/or its affiliates. All rights reserved. Cisco Public 51

51 Latency TE Service Data from Tokyo to Brussels IGP shortest-path via US, higher and cheaper capacity Prefix SID of Brussels Voice from Tokyo to Brussels SRTE policy pushes one additional segment Russia Anycast Low-latency path Node segment to Brussels Node segment to Russia Benefits ECMP Availability of the anycast segment against node failure No hop-by-hop signaling load and delay No mid-point state Brussels pkt Data Russia Brussels pkt Voice BRKSPG Cisco and/or its affiliates. All rights reserved. Cisco Public 52

52 Egress Peer Engineering AS1 Best BGP and IGP Path PrefixSID(B) Payload ISIS/SR-based WAN B Payload AS2 D AS4 A TE Policy installed by Controller PrefixSID (C) PeeringSID(E) Payload Engineered Path PeeringSID(E) Payload C Payload AS3 E /32 Engineered Path BRKSPG Cisco and/or its affiliates. All rights reserved. Cisco Public 53

53 Large-Scale Aggregation ASBR SID s are anycast ASBR SID s are unique across the entire domain A 70 Acces1 B 72 ASBR1A 1001 ASBR1B 1001 Core ASBR2A 1002 ASBR2B 1002 Acces2 C 72 ASBR anycast prefixes and SID are redistributed within each access region Access Nodes are provided a SID which is unique with respect to its attached ASBR s but not necessarily unique across the whole domain Only IGP/SR (no BGP) Automated FRR including ASBR failure SRGB (k) << # access nodes (100k) {72} leads to B within Access1 {72} leads to C within Access2 {1001, 72} leads to B from anywhere {1002, 72} leads to C from anywhere SDN Controller programs the segment list together with service creation BRKSPG Cisco and/or its affiliates. All rights reserved. Cisco Public 54

54 SR-Based Massively Scaled Data Center (MSDC) MPLS data-plane BGP control-plane No LDP, No RSVP-TE Integrated/Automated FRR No hop-by-hop manual configuration of static routes and their FRR behaviors Global label for easier operation Same SRGB at each switch SR-TE WAN Optimization Controller applicable to DC fabric BRKSPG Cisco and/or its affiliates. All rights reserved. Cisco Public 55

55 Use Cases & Implementation: Purpose Built Applications for WAE & XTC

56 WAE Design Application TI-LFA Simulation How many segments in backup chain Capacity analysis during FRR transient state BRKSPG Cisco and/or its affiliates. All rights reserved. Cisco Public 57

57 Coordinated Maintenance Select Evaluate Schedule Network element ID circuits traversing node Impact to global network Network capacity to reroute LSPs Time changes prior to outage Time normalization BRKSPG Cisco and/or its affiliates. All rights reserved. Cisco Public 58

58 Application-Engineered Routing Segment Routing: Calculate Shortest Path and Program Router A Step 1 App requests 2 Gbps from A to Z Apps REST APls Step 3 WAE/XTC instantiates the PCEP tunnel on A {16066, 16068,16065} Analytics WAN Automation Engine Optimization and Prediction Calendaring A B C Full D Current Model Network Modeler New Model Z Collector Network Interface Deployer M N O P PCEP Step 2 Shortest path ABCDZ is congested between C and D. Path ABCOPZ is fine. WAE/XTC verifies BW availability; steers the traffic on this path. BRKSPG Cisco and/or its affiliates. All rights reserved. Cisco Public 59

59 Application-Engineered Routing Segment Routing: Calculate Two Disjoint Paths and Program Router A Step 1 App requests disjoint paths between A and Z Apps REST APls Step 3 WAE/XTC programs two PCEP tunnels C Analytics WAN Automation Engine Optimization and Prediction Calendaring B D E Current Model Network Modeler New Model A Z Collector Network Interface Deployer M N O PCEP Step 2 WAE/XTC dynamically computes two disjoint paths to steer the traffic Two tunnels avoiding the optical shared-fate links BRKSPG Cisco and/or its affiliates. All rights reserved. Cisco Public 60

60 Use-Case: Bandwidth Scheduling (On Demand) 4 3 Analytics Current Model RESTful APIs WAN Automation Engine Optimization and Prediction Network Modeler Calendaring New Model 1 2 Network conditions, content site reachability fed to collector Customer requests DC #1 DC #2 bandwidth ASAP 2 Data Center #1 R1 1 WAN Collector 5 Network Interface PCEP Congested!! R2 R3 Deployer Data Center # Demand admission request: <R1-R3, B/W, NOW> WAE returns option and customer confirms If needed (insufficient bandwidth), R1-R3 LSP tunnel programmed using PCEP Problem Provider s customer has an on-demand need for a data center backup Result After determining a best path, WAE programs an LSP using PCEP BRKSPG Cisco and/or its affiliates. All rights reserved. Cisco Public 61

61 Use-Case: Bandwidth Calendaring 4 3 Analytics Current Model RESTful APIs WAN Automation Engine Optimization and Prediction Network Modeler Calendaring New Model 1 2 Network conditions reported to collector consistently Customer requests DC #1 DC #2 bandwidth at a future date 2 1 WAN Collector PCEP Network Interface R2 Deployer 3 4 Demand admission request: <R1-R3, B/W, future date> WAE returns booking confirmation as the future date nears Data Center #1 R1 5 R3 Data Center #2 5 On the future date, WAE places customer demand on IGP or explicit path (TE tunnel) Problem Enterprise customer uses self-service portal to request bandwidth between data centers Solution At the predetermined time, WAE places the demand on the network (using either IGP or MPLS TE) BRKSPG Cisco and/or its affiliates. All rights reserved. Cisco Public 62

62 Use-Case: Tunnel Load Balancing TE Tunnel Builder App 2 Analytics Current Model RESTful APIs WAN Automation Engine Optimization and Prediction Network Modeler Calendaring New Model Network conditions reported to collector, accessible to app App determines LSP imbalance and requests WAE to recalculate LSP loadshare metrics R1 Collector 1 Network Interface 4 AS Foo Deployer PCEP 3 4 WAE computes new load share metrics WAE programs new load-share metrics for LSPs using PCEP WAN Problem A service provider needs to efficiently use expensive resources (high-cost links, perhaps transoceanic) Solution The most expensive network resources are fully optimized by WAE, assigning best load share metrics using PCEP BRKSPG Cisco and/or its affiliates. All rights reserved. Cisco Public 63

63 Use Case: Policy-Based Path Planning TE Manager App 2 Analytics Current Model RESTful APIs WAN Automation Engine Optimization and Prediction Network Modeler Calendaring New Model Network conditions reported to collector, accessible to app App requests disjoint LSPs from access to aggregation router Collector 1 Network Interface 4 Deployer PCEP 3 4 WAE computes new LSPs based on current topology WAE programs tunnels using PCEP Access Node Problem A service provider needs to provision disjoint LSPs from an access to aggregation router, even across failures 5 WAN Aggregation Node Result 5 The app and WAE work together to automatically keep these paths disjoint, despite failures or topology changes WAE creates LSPs and ensures paths remain disjoint BRKSPG Cisco and/or its affiliates. All rights reserved. Cisco Public 64

64 Use Case: Multi-Domain Topology Compute Multi-Domain Topology SR PCE DC A1 METRO A WAN METRO B DCB2 vpe ToR Spine DCI LSR AGG LSR AGG LSR DCI Spine ToR vpe Multi-Domain topology Realtime reactive feed via BGP-LS/ISIS/OSPF from multiple domains Including IP address and SID Compute: stateful with native SRTE algorithms BRKSPG Cisco and/or its affiliates. All rights reserved. Cisco Public 65

65 On-Demand SR Next-Hop Reachability SR PCE 4: {16002, 18001, 20001} 2: V via vpe2 VPN-LABEL: BGP RR 1: V via vpe2 VPN-LABEL: DC A1 METRO A WAN METRO B DCB2 3: vpe2? vpe ToR Spine DCI LSR AGG LSR LSR Spine ToR vpe vpe1 s ODN functionality automatically request a solution from SR-PCE Scalable: vpe1 only gets the inter-domain paths that it needs Simple: no BGP3107 pushing all routes everywhere BRKSPG Cisco and/or its affiliates. All rights reserved. Cisco Public 66

66 Binding SID to Stitch Policies SR PCE 3: REPLY {16001, 4001, 20001} instead of {16001, 16003, 16002, 18002, 18001, 20001} 2: vpe1 with Min LAT? 1: REPORT {16003, 16002, 18002, 18001}, UP, BindingSID 4001 DC A1 METRO A WAN METRO B DCB2 vpe ToR Spine DCI LSR AGG LSR AGG LSR DCI Spine ToR vpe End-to-end policies can be composed from more basic ones An SRTE policy is bound by default to a Binding SID RSVP-TE tunnels can also be bound to a Binding SID and hence RSVP-TE tunnels can be used within an end-to-end SR policy Shorter SID list and churn isolation between domains Even if the WAN-MetroA sub-path changes, the related Binding SID 4001 is constant BRKSPG Cisco and/or its affiliates. All rights reserved. Cisco Public 67

67 Demo

68 Demo Summary Under normal conditions MPLS labels propagated via SR ISIS extensions, traffic CE1-CE2 travels over LSP following IGP b Low latency path does not follow the IGP best path Low latency traffic will be steered on low latency path while all other traffic will follow IGP best path Lo0 SID POP (PHP) IP IP P1 IP 5 20 IP CE1 PE1 Lo0 SID PE2 Lo0 SID CE2 P2 Lo0 SID IGP metric = RED TE metric = ORANGE BRKSPG Cisco and/or its affiliates. All rights reserved. Cisco Public 69

69 Conclusion

70 The Solution Application Engineered Routing Applications express requirements bandwidth, latency, interactive 1 Applications Applications are mapped to a path defined by a list of segments SDN Controller 3 The controller collects data from the network topology, link states, link utilization, 2 Segment Routing (SW upgrade) Network maintains segments only No application state BRKSPG Cisco and/or its affiliates. All rights reserved. Cisco Public 71

71 Additional References & Information Cisco.com Page for Application Engineered Routing Segment Routing Page Cisco.com Page for WAE Products and Associated Services WAE on DevNet Cisco WAN Segment Routing Demo Realizing your WAN/MAN Orchestration Dreams Cisco Advanced Services Capabilities and Offers Just Ask! BRKSPG Cisco and/or its affiliates. All rights reserved. Cisco Public 72

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75 Thank you

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