ABSTRACT Intelligent network management is one of the long term efficient approach for reducing Opex and Capex. Recently, energy efficiency in transport network can be achieved by varied research of automatic path connection management with control plane functions. In packet and optical transport network, maximum resource utilization, path computation, energy awareness and its optimization will be more complicated. In this paper, we investigate management and control plane software components to improve multi-layer network operation such as network planning tool, path computation engine, virtual network topology manager, and embedded OAM&P functions and protocols. Finally, we propose the enhanced path connection control architecture using knowledge-based technique for energy aware network communication .
The basic path computation in transport network is the shortest path algorithm with various policies and traffic constraints as input parameters. IETF and ITU-T standardization activity and study for energy efficient scheduling, routing and network planning tool are introduced . Port level power on/off control and dynamic power management protocol and multi-layer network planning approach is announced in . And the measured data of power consumption in forwarding plane, control plane, power supply and their relative comparison of a few dominant transport equipment . Even though the goal of transport network path connection is maximum resource utilization and optimization, the system efficiency should be satisfied the real time service provisioning. Therefore, coordinated path connection control architecture which include time, energy and traffic engineering factors contribute to build a feasible network configuration.
NPT: Power consumption on forwarding and control plane components should be evaluated based on physical resources and time factor for recent energy saving requirement. NMS: Multi-layer NMS for IP/Optical Network is an approach to provide optimal LSP with coordinated alarm functions for IP/optical integrated network. If the energy efficiency is the constraint, legacy NMS should be modified or extended as the important traffic engineering parameters. PCE: Path Computation Engine exists for the computation of all possible path candidates each layer using all traffic constraints. Therefore, the performance and scalability of algorithm is essential to provide customer satisfied provisioning and maintain the network efficiency. In this component, minimum blocking and energy factor such as power consumption of each physical and logical transport resources is the main goal. VNTM: A feasible path computation in higher layer is possible from the virtual network topology. It has the role of assessment demands, lower layer label switched path setup, creation of higher layer TE link, regrooming to free unused traffic and interaction with path computation engines. TED: Each management components collect, generate and share these well-defined databases. For better operation, well-defined information and knowledge has the important role as the expert system. The raw connectivity data between neighbor elements are the useful basic routing information in TED. MP & CP: Soft-permanent and switched connections are cooperated with resource and traffic engineering data provided from management plane. Link management, routing and signaling, path computation element protocol extensions are ongoing for network efficiency in control plane. By the enhanced GMPLS protocols in multi-layer network, the measured energy sensitive data will be disseminated in centralized and distributed path computation components. MAGPIE: MAGPIE provides a green path with inference engine extended standard based platform in packet-optical convergence network. Any new constraints, transmission characteristic, operational knowledge in multi-layer are maintained in well-organized database.
This figure shows soft-permanent connection using typical generalized multi-protocol label switching (GMPLS) protocol. External routing computation engine co-works with transmission system and network management system. In this environment, permanent connection also setup by cross connection function in each management and forwarding plane. We figure out the role and responsibility of path connection setup related component within transport system and management system for satisfying rapid one-click service provisioning in multi-layer network. In broadband convergence network, energy efficient routing and path computation of multi-layer transport is the most important factor. For instance, computation parameters for packet and optical multi-layer environment are illustrated in GMPLS-based control plane and management plane. Main functions execute in management and control plane for network operation. Upon environmental changes, it's necessary to reflect in network planning and route computation. Therefore, we designed green path setup control method from the viewpoint of multi-layer integrated operational continuity and reliability.
In broadband convergence network, energy efficient routing and path computation of multi-layer transport is the most important factor. For instance, computation parameters for packet and optical multi-layer environment are illustrated in GMPLS-based control plane and management plane. Main functions execute in management and control plane for network operation. Upon environmental changes, it's necessary to reflect in network planning and route computation. Therefore, path computation parameters in Tab. 1 should be considered for optimizing between adjacent transmission layers.
Starting from the path computation element, the reduction of power consumption accomplished in various systems in management and control plane. This figure shows the components to achieve the goal for green communication and improved path connection. The enhanced architecture components are NPT, NMS, PCE and TED, VTNM. The transport network market focused on packet-based backhaul transmission specially cost and energy efficiency. In this figure, the architecture of MAGPIE introduced to achieve the goal of green network requirements. MAGPIE provides a green path with inference engine extended standard based platform in packet-optical convergence network. Any new constraints, transmission characteristic, operational knowledge in multi-layer are maintained in well-organized database. Energy consumption data provided as the same unit in long-term view using the data in energy consumption report . For instance, MAGPIE provide alternative paths to meet the green requirement with under the satisfaction on energy per bit constraints, the measurement threshold in E/O O/E conversion, fiber characteristics, amplifier, cross-connect, regenerator, dispersion, power, delay, jitter, loss, energy consumption in a specific years, port/slot/shelf/node locality. Therefore, TED is able to share with PCE, NPT, NMS and VNTM for multi-layer optimal path. In this method, the extensibility of traffic engineering parameters is applied in space and time aspects. This flexible component meet the pre-calculated knowledge for shortest and energy saving path. It also applied various constraints such as fully automatic, semi-automatic and manual path upon the network operation’s condition without modification of legacy management system.
Transport network is working by well-defined management system which provides the function on FCAPS (Fault, Configuration, Accounting, Performance and Security) management. Therefore, NMS controls each network elements to meet the customer service requirements with optimal resource consumption. Multi-layer NMS for IP/Optical Network is an approach to provide optimal LSP with coordinated alarm functions for IP/optical integrated network. If the energy efficiency is the constraint, legacy NMS should be modified or extended as the important traffic engineering parameters. MONCP (Multi-layer Optical Network Control Platform) is also intelligent packet-optical network control system including standard management components with Path Computation Element (PCE). Fig. 2 shows the multi-layer link-path relationship in packet-optical transport network. The coordination in configuration, fault, and performance functions is able to provide economic operation and maintenance in transport network. It gives the real-time resource information for the optimal and green route based on layer coordinated management architecture.
POINTS (Packet-Optical Integrated Network Transport Switch) network testbed make for validating several QoS guaranteed services through packet-optical transmission network. Video clients get high quality video service within 4.5 seconds through GMPLS based soft-permanent connection in PBB-TE transport technology. As the simulation result of path connection, it’ll take 2.5 hours for 2,000 tunnel including forwarding. This shows the service efficiency from the service request using automated network control protocol. Point to multipoint service, E-Line service, E1/T1 circuit emulation services, and ring protection are also tested in the same configuration.
Soft-Permanent Connection Setup MONCP/EMS/CLI request LSP setup on ingress node, POINTS#1. GMPLS-based control plane provides the possible path through Path/Resv protocol messages within 5 seconds. Then, video streaming service is initiated to the client 2 who connect to the egress node, POINTS #3. - Step 1: Link Resource Management (LMP, Link Management) Protocol . Automatic Discovery of Neighbor Nodes and Collection of Link State between Neighbors . Control Channel Management and Data/Traffic Engineering Link State Information Exchange - Step 2: Routing (OSPF-TE) Protocol . Generation of Routing Information based on the Interface Information from LMP . Integrated Network Resource Management through Routing Protocol - Step 3: Resource Reservation Signaling (RSVP-TE) Protocol . Real-time Automatic Control of End-to-End OTL, PTL Path based on Routing Information Permanent Connection Setup MONCP/EMS/CLI request LSP setup on every explicit node which locates in transport path: POINTS#1, #2 and #3 in this testbed. Each node reply the result of cross-connection operation in management plane to the manager component. After receiving the successful reply from all nodes, the client finally get the streaming service in near real-time.
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ICWES15 - Green Path Connection in Multi-Layer Transport Network. Presented by Eungoung Cho, ETRI (Electronics and Telecommunications Research Institute), Korea
Green Path Connection in Multi-Layer Transport Network 2011.7.20 Eunyoung Cho*, Sunme Kim, Wonkyung Lee, Hoyoung Song, Jehoon Yoo, Taewhan Yoo, Jonghyun Lee Optical Internet Department ETRI, KOREA ICWES15 ET R I
Contents <ul><li>Packet-Optical Integrated Network Transport Switch </li></ul><ul><li>GMPLS-based Multi-Layer Path Computation </li></ul><ul><li>Architecture for Green Path Computation </li></ul><ul><ul><li>Network Planning Tool (NPT) </li></ul></ul><ul><ul><li>Network Management System (NMS) </li></ul></ul><ul><ul><li>Multi-Layer Resource Information </li></ul></ul><ul><ul><li>Path Computation Engine (PCE) </li></ul></ul><ul><ul><li>Virtual Network Topology Manager (VNTM) </li></ul></ul><ul><ul><li>Management Plane and Control Plane Components </li></ul></ul><ul><ul><li>Multi-Layer Aggregation Path Inference Engine ( MAGPIE) </li></ul></ul><ul><li>POINTS Testbed </li></ul><ul><li>Conclusion </li></ul>/10 ICWES15
ICWES15 /10 Packet-Optical Integrated Network Transport Switch <ul><li>Multi-Layer Integrated Switching Technology including IP Flow, L2 Label, L1 VC, L0 Lambda </li></ul><ul><ul><li>cut-through path consistent with the existing backbone routing </li></ul></ul><ul><ul><li>L0/L1/L2/L3 Integrated and Dynamic Provision though MONCP (Multi-Layer Optical Network Control Platform) </li></ul></ul><ul><ul><li>Integration with Premium IP Service and VPN </li></ul></ul><ul><ul><li>Reduce Opex/Capex through Simplified Aggregation </li></ul></ul><ul><ul><li>Highly reliable and guaranteed Path </li></ul></ul>IP/MPLS PSTN High speed Internet VOD Live IP-TV VoIP VPN FTTH Business Residential Voice Live IPTV WiBro SDH/OTH Storage L.L/VPN OLT Mobile Best Effort POINTS RT DWDM POINTS Edge POINTS Core Service platform 3G Core Network IP flow-aware Packet Transport Native POTS Functionality Cut-through Path Unified Multi-Layer Control & Management Core Network Metro Network Access Network Multi-Layer Optical Network Control Platform (MONCP) <ul><li>Resource Management (Optical/Packet) </li></ul><ul><li>One Click Provisioning </li></ul><ul><li>GMPLS Interworking </li></ul>Voice Video P2P HTTP PTL 1 Flow(s) OTH WDM w/ ROADM PTL 2 PTL 3
Multi-Layer Path Computation Parameters /10 ICWES15 Multi-Layer Protocol Path Computation Parameters GMPLS based Packet/Optical Transport Layer - Bandwidth - Affinities, Link, Node inclusion/exclusion - Shared Risk Link Group inclusion/exclusion - Maximum e2e IGP metric - Maximum hop count - Maximum e2e TE metric - Degree of paths disjointness - Energy Efficiency and port/slot/shelf locality - Switching/Encoding type - Link protection type
MAGPIE: Multi-Layer Aggregation Path Inference Engine /10 ICWES15 <ul><li>* Solutions </li></ul><ul><li>- Power consumption </li></ul><ul><li>in ports/line cards/chassis </li></ul><ul><li>in IP/Packet/Optical layer </li></ul><ul><li>ASIC </li></ul><ul><li>Smart cooling technology </li></ul><ul><li>Center office Restructuring </li></ul><ul><li>Ring vs. Mesh topology </li></ul><ul><li>High bandwidth utilization in ASON </li></ul><ul><li>Forwarding engine >> switching fabric, control plane S/W </li></ul><ul><li>* Related work </li></ul><ul><li>EER algorithm and its performance </li></ul><ul><li>Energy per bit (BW, loss, etc) </li></ul><ul><li>Tolly Group Report </li></ul><ul><li>Fuzzy Controlled RWA </li></ul><ul><li>Power saving network: </li></ul><ul><ul><li>dynamic link/port-based power on/off </li></ul></ul>PCE POINTS POINTS NMS: Network Management System NPT: Network Planning Tool PCE: Path Computation Element VNTM: Virtual Network Topology Manager PTL: Packet Transport Layer, OTL: Optical Transport Layer TE: Traffic Engineering, SLA: Service Level Agreement, LSDB: Link State Database MAGPIE: Multi-Layer Aggregation Path Inference Engine POINTS: Packet-Optical Integrated Transport Switch Control Plane RSVP-TE OSPF-TE LMP Management Plane PTL Data Plane OTL Data Plane VNTM PCE NMS NPT Discovered Topology, Multi-Layer LSDB, TE constraints, SLA MAGPIE
Path Correspondence in Multi-Layer Network /10 ICWES15
Conclusion /10 <ul><li>Architectural Components of Multi-Layer Network </li></ul><ul><li>Flexible Components for Green Path Computation </li></ul><ul><li>PCE Integration in PBB-TE/MPLS-TP/ROADM Transport Technology Network </li></ul><ul><li>World Leading Prototype of Packet/Optical Integrated Network Transport System </li></ul><ul><li>5 seconds Soft-Permanent/Permanent Connection Services in Transport Network through GMPLS-based Control Plane and Management Plane Functions (days hours) </li></ul><ul><li>Future Work: Deployment in KOREN from Aug. 2011, </li></ul><ul><li> Interoperability Test, </li></ul><ul><li> Yeosu Expo by co-working company </li></ul>ICWES15