Applying CIM to SD-WAN Weiqiang Cheng, Feng Yang(CMCC) Jin Zhou, Qilei Wang (ZTE) 把目标定义清楚

Outline Definition, Purchasing Drivers and Deployment Challenges New Features Service Use case Architecture Analysis about applying CIM to SD-WAN scenario

SD-WAN Definition, Purchasing Drivers and Deployment Challenges Business Performance Cost Reliability Simplicity Agility Software-Defined Wide Area Network (SD-WAN) is the application of software-based network technologies to WAN connections to more effectively route all network traffic between headquarters or data centers, remote and branch offices, and the cloud. Top 5 Purchasing Drivers Top 5 Deployment Challenges Faster service provisioning Ability to scale the network on-demand Business agility to adjust to market dynamics Ability to dynamically tailor to application needs Lower network connectivity service costs Current OSS/BSS systems are inadequate Integration with legacy infrastructures Standards are insufficient or incomplete Network operators are strategically committed Funding constraints for deployment

much more than connectivity End-to-End solution New Features of SD-WAN modern SD-WAN solutions have evolved to offer even broader capabilities, including: Automation of end-to-end solution provisioning Enterprise network modeling, network definition Zero touch provisioning (ZTP) of on-premise devices, including establishing connectivity Provisioning of multiple node types (spoke, hub, concentrators, etc.) End-to-end, application-level SLAs through continuous path measurement Dynamic application steering to counteract link degradation End-to-end visibility and monitoring of devices, connectivity, and application performance Intent-based policy creation to define traffic treatment Security through Enterprise-wide policies Multiple connection types – MPLS, Internet, LTE, etc. Dynamic path selection, and ability to load balance across multiple WAN connections Secure site-to-site connectivity - tunneling and VPNs Support for 3rd-party services, such as advanced security, WAN optimization, etc. An intuitive interface for managing WAN connections Ability to make use of all available uplink paths Ability to optimize use of WAN connection for cost savings Application-aware performance monitoring over WAN links Dynamic spoke/endpoint learning and reachability much more than connectivity End-to-End solution

Service use case (from MEF) SD-WAN Edge Physical or Virtual SD-WAN Gateway between SD-WAN and CE/MPLS SD-WAN Controller Centralized Management of SD-WAN Edges & Gateways Service Orchestrator Lifecycle Service Orchestration of SD-WAN and other services Subscriber Web Portal Subscriber service ordering and modification

Architecture Comprised of four functional layers: Overlay tunnel Underlay connectivity physical connectivity between devices in SD-WAN sd-wan edge(physical or virtual) located at customer branch sites supports all the links for data traffic simultaneously Overlay tunnel logic tunnel connectivity between devices in SD-WAN network segmentation Centralized controller central control and distribution of routing policy service-level routing information and related location mappings Management and orchestration application-driven, policy-based routing management many devices configuration templates service automation via end-to-end operational workflows ZTP for edge into the network

IMs applied in SD-WAN The ideal way how carrier operating large scale network service: Basic service requirements: Service can cover common requirements with some options Service can span across domain, region Simplicity for network plan, operation No vendor lock-in Common IM proposed to achieve aforementioned goal Physical Interface: ethernet、PON、LTE、5G、WiFi, etc Logical Interface: e.g. LAG, VLAN sub interface, etc IP: IP interface, ARP, Routing, VPN(VRF), VRRP, DHCP, etc Tunnel: VxLAN, IPSec Services: EVPN, SRv6, etc QoS & Forwarding policy: Metering/Policing, ACL, PBR, DPI, NAT, etc Link measurement: TWAMP, NQA Performance & Alarm management: telemetry, alarm

Analysis about applying CIM to SD-WAN scenario FD (forwarding domain) can be used to represent the possibility of setting up underlay connectivity and overlay tunnel. Multiple FD are maintained to represent various kinds of capability. A specific FC (forwarding construct) instance would be created after bring a SD-WAN connection into service. As the paths in one end-to-end connection maybe comprised of multiple network path segments, and these segments may belong to different administrative domain, multiple FC are concatenated together to represent an end-to-end connection. LTP is employed to represent the termination and adaptation function at the end point of underlay connectivity and overlay tunnel. A number of policy may be developed as the attributes of FD or FC to represent automatic capabilities of network supported, e.g., ZTP (zero touch provisioning) policy. Gap?

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