GMPLS, SDN, Optical Networking and Control Planes


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Check out the slides Achim Autenrieth presented at this year's MPLS SDN World Congress in Paris

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GMPLS, SDN, Optical Networking and Control Planes

  1. 1. Achim Autenrieth, ADVA Optical Networking MPLS SDN World Congress 2014 March 18-21, 2014 / Paris, France GMPLS, SDN, Optical Networking, Control Plane
  2. 2. © 2014 ADVA Optical Networking. All rights reserved.22 Cloud Connectivity: What Is Hot? Network Virtualization Programmable WAN connectivity with open SDN implementation Business Continuity Low-latency connectivity for synchronous mirroring and disaster recovery solutions Mega Data Center Connectivity Cost-, space- and power-efficient high-capacity transport Cloud and traditional data center growth “Cloud data center traffic will grow 6-fold from 2011 to 2016 reaching ca. 5 ZB” Source: Global Cloud Index 2012, Cisco Data Center Connectivity Cloud services drive demand for dynamic high-speed data center connectivity
  3. 3. © 2014 ADVA Optical Networking. All rights reserved.33 NMS / CP / SDN Mission Key Facts Transport SDN for Flexible Optical Networks • Datacenter Connectivity • Cloud Bursting • Secure multi- tenancy • Global network visibility with “real-time” control • De-couple virtual from physical network • NFV support From cloud access to optical Terabit/s connectivity Use Cases and Drivers Enablers DC Site 1 MAN / WAN DC Site NEnterprise Tenant B cloud Tenant C cloudTenant A cloud • Network Abstraction • Virtualization • Open & standardized interfaces • Multi-tenancy capability • Integration with existing OSS / NMS / CP SDN turns the network into a programmable resource
  4. 4. © 2014 ADVA Optical Networking. All rights reserved.44 What is SDN? Open Networking Foundation white paper In the SDN architecture, the control and data planes are decoupled, network intelligence and state are logically centralized, and the underlying network infrastructure is abstracted from the applications. • SDN is an architectural framework for creating intelligent networks that are programmable, application aware, and more open. • SDN allows the network to transform into a more effective business enabler. • SDN enables applications to request and manipulate services provided by the network and allows the network to expose network state back to the applications. • A key aspect to the architectural framework is the separation of forwarding from control plane, and establishment of standard protocols and abstractions AT&T Domain 2.0 Vision white paper How does SDN apply to Optical Transport Networks?
  5. 5. © 2014 ADVA Optical Networking. All rights reserved.55 Transport SDN – Early Attempts “If all you have is a hammer, everything looks like a nail.” Abraham Maslow, 1966 Transport SDN is much more than OpenFlow and protocol extensions.
  6. 6. © 2014 ADVA Optical Networking. All rights reserved.66 Packet Switch != Optical Switch Packet Switch Optical l-Switch Signal format Digital electronic Analog optical Signal structure Ethernet frames Signal dependent Payload visibility Yes No Topology discovery In-band (e.g. LLDP) Out-of band (e.g. OSC) Fabric connectivity Any-to-any Constrained Path feasibility Implicit Dep. on signal quality Path set-up Any order Sequential Target: Optical layer connectivity but hiding optical complexity
  7. 7. © 2014 ADVA Optical Networking. All rights reserved.77 Optical Network != Generic Hardware Connectivity & Topology Discovery Signal Mapping & Format Compatibility Optical Performance Constraints Sequential Lightpath Setup/Teardown Optical Power Balancing OSC (Out-of-band) a) 40km b) 60km c) 20km a) b) c) d) d) WSS WSS WSS WSS WSS Fixed / Tunable transponders External Wavelengths Regenerators Colorless Module(s) Line Ports Directionless Module
  8. 8. © 2014 ADVA Optical Networking. All rights reserved.88 “Legacy”Transport Network programmability HW abstraction and virtualization Centralized management & control Flow/circuit oriented data plane SDN vs. “Legacy” Optical Transport Separation of data and control plane      SDN Principles Top-down approach: Facilitate optical layer virtualization & programmability.
  9. 9. © 2014 ADVA Optical Networking. All rights reserved.99 • GMPLS *is* SDN (or a functional component of SDN) • Control and Data plane separation was a basic design principle together with Centralized Control & Hardware Abstraction: see ASON - RFC4397/4652 • Transport node<Data Plane> is a logical network device (…) originating and/or terminating of a data flow and/or switching (…). • Controller<Control Plane> is a logical entity that models all control plane intelligence (routing, traffic engineering (TE), and signaling protocols, path computation, etc.). A single controller can manage one or more transport nodes. SDN/GMPLS for Optical Networks How to leverage existing GMPLS control plane for SDN?
  10. 10. © 2014 ADVA Optical Networking. All rights reserved.1010 • Orchestration ~ automated configuration / coordination / management of complex systems, devices or systems, can present or deploy autonomic control and elements of control theory. • A higher level system is required for “end to end composition” or virtual networks • Abstraction of hardware and virtualization enables homogeneous service activation processes • Coordinate the deployment of services controlled by either GMPLS or OpenFlow End to End Service Orchestration with GMPLS as Internal Signaling Protocol DC Eth. Aggr. OpenFlow- controlled Ethernet Aggregation WAN GMPLS-controlled virtual (o real) WSON/SSON GMPLS Cloud Computing Orchestration OVS SDN Ctrl. OpenFlow- controlled Ethernet/L2 Switches OpenFlow OVS OVS PCE OpenFlow SDN Ctrl. SDN Ctrl. ?
  11. 11. © 2014 ADVA Optical Networking. All rights reserved.1111 How Transport Fits in SDN Model Network Hypervisor User Interfaces 3rd Party Apps Transport Apps Optical Network Controller Management Fault & Alarms Configuration Accounting Performance Security Control Topology Disc Path Compute Provisioning Resource Mgr Policy Mgr Database Flow DB Topology DB Resource DB Policy DB Optical Network Hypervisor Network Hypervisor Storage Compute Optical Network Orchestration SDNSDN Controller Orchestration • Hypervisors allowed Storage and Compute resources to be managed together. • SDN allowed Networking to join through an Orchestration layer • Transport is added by extending the SDN controller function. Network Hypervisor virtualizes the optical network and presents an abstracted view to the SDN controller
  12. 12. © 2014 ADVA Optical Networking. All rights reserved.1212 Topology Virtualization Options Abstract Link • “You can reach this destination across this domain with these characteristics” • Paths in the optical domain become links in the virtual topology • Allows vendor independent constraint modelling Virtual Node • Hierarchical abstraction • Presents subnetwork as a virtual switch • Simple model, but can be deceptive • No easy way to advertise “limited cross- connect capabilities” Virtual Node aggregation hides internal connectivity issues and physical constraints Abstract Link aggregation needs compromises and frequent updates See also: Aihua Guo, "Network Virtualization", OFC 2014, M2B.5
  13. 13. © 2014 ADVA Optical Networking. All rights reserved.1313 Optical Network Hypervisor WAN is exposed as virtual topology using OpenFlow or Restful API. SDN Controller #2 SDN Controller #1 Provider Controller SDN Controller #3 Optical Network Controller / HyperVisor FSP SW Suite SNMP, NETCONF OF, NETCONF, RESTful API OF, NETCONF, PCEP OF, PCEP, NETCONF GMPLS-AL, BGP-LS SNMP, MTOSI OpenFlow PCEP GMPLS-ALBGP-LS NETCONF/YANG REST AbstractionPhysicalressourcesDerivedtopology GMPLS TED LSPDBPCE
  14. 14. © 2014 ADVA Optical Networking. All rights reserved.1414 Demonstration of SDN Use Cases ECOC 2013 Postdeadline Paper ECOC 2012 ECOC 2012 Postdeadline Paper OFC/NFOED 2013
  15. 15. © 2014 ADVA Optical Networking. All rights reserved.1515 STRAUSS SDN Orchestration Testbed SDN Network Orchestration ABNO Controller PCE GMPLS-enabled Flexi-grid DWDM domain Active Stateful PCE TED LSPDBTED Topology Server VNTM Topology Server OPS Flow Server Provisioning Manager TREMA Controller REST API OpenFlow OpenFlow- enabled OPS/Flexi-grid DWDM domain NOX Controller REST API OpenFlow OpenFlow- enabled OPS DWDM domain OpenFlow Controller REST API Network Hypervisor OpenFlow + GMPLS enabled DWDM domain OCS OPS OCS TED LSPDB @ICTstrauss
  16. 16. © 2014 ADVA Optical Networking. All rights reserved.1616 SDN Enables Optical Network Operation and Control Innovation Datacenter Connectivity Network Virtualization & Orchestration Multilayer Optimization Open Application Framework
  17. 17. © 2014 ADVA Optical Networking. All rights reserved.1717 Optical Transport Network Evolution with Software Defined Networking Network & Service Mgmt & Apps Control Plane SDN Existing NM & CP software portfolio will be extended and complemented with new SDN-based software modules Abstraction & Virtualization End-to-End Service Orchestration Network Programmability   
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