Why do operators need multi-layer coordination?
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1 Why do operators need multi-layer coordination? Víctor López Routing Research Symposium Network Architecture Geeks (NAG) Oct. 2012
2 Index Towards Cloud Ready Transport Networks Multi-layer Networks Multi-layer restoration Demonstrations ONE project O2 Germany field trial Further steps Data plane integration SDN Integration with Elastic Networks Final Remarks
3 01 Towards Cloud-Ready Transport Networks
4 01 Towards Cloud-Ready Transport Networks Multilayer Coordination Photonic control plane GMPLS + PCE Routing, monitoring and automated IP configuration Routing, monitoring and automated Photonic network configuration Signalling Cloud services Multi-layer coordination Network Optical Network Flexible Transport Network Cross-Stratum Optimization Cross-Stratum Optimization L. M. Contreras, V. López, O. González de Dios, A. Tovar, F. Muñoz, A. Azañón, J.P. Fernández- Palacios, J. Folgueira: Towards Cloud-Ready Transport Networks, in IEEE Communications Magazine, September 2012, Vol. 50, Issue. 9, Pages
5 01 Cloud-ready Network Approach Cloud Ready Networks rely on two main technological pillars Network Control Flexible Transport Network The target is an E2E network able to perform automated connectivity control between end users and cloud data centers This innovative network model aims to: ü ü ü ü Accelerate service provisioning and performance monitoring Enable on-demand connectivity configurations (e.g bandwidth) by end users Optimize both cloud costs and power consumption Guarantee the required QoS/QoE ( ) for real time and video services Cloud Services Leverage of Network- Control Flexible transport network CPE E2E MPLS photonic network Mobile and Fixed Access Networks API Network-Cloud interface: new services development Resource Mngmt IP control and resource allocation (e.g IP v6) IP Forwarding E2E MPLS OPTICAL TRANSPORT Elasticity & QoS Capacity 5
6 02 Multi-layer networks
7 02 Independent Layers Access Transit IX IX Transit Access Access Network Residential IP services, L3 VPN,... L2 VPN,.. L2 Aggregation Metro Core ISPs Core Metro Inter/ction WSON Carrier A Carrier B 7
8 02 Current Multilayer Coordination Access Transit IX IX Transit Access Access Network Residential IP services, L3 VPN,... L2 VPN,.. L2 Aggregation Metro Core ISPs Core Metro Inter/ction Load balancing is triggered by the Network Management System according to off-line multilayer optimization algorithms WSON Carrier A Carrier B Load balancing between and WSON. High capacity flows (e.g between IP access and IP interconnection) are directly transported over WSON 8
9 02 Current multi-layer provisioning Hours Hours/Days Hours/Days Very costly Time Money Human dependent Hours 9
10 02 What do we want of a multi-layer network? Router is configured IP link 1-3 IP node 1 IP node 2 IP node 3 In multivendor scenarios IP i/f 1 IP i/f 0 network T i/f 1 ML link 1-3 T-node 1 λ 2 T-node 2 T i/f 0 T-node 3 Photonic Mesh Standard interface to configure the routers. NETCONF is standard (RFC 6241), but data models are vendor dependent. T-node 4 Pending standardization work NOW!! Openflow enables standard configuration of flow tables. Is it enough? Interaction between the PCE Pending and standardization the VNTM for work multi-layer networks. An element is required to configure VNT to the upper layer through a standard interface. Functional validation of the cooperation between Virtual Network Topology Manager (VNTM) and Path Computation Element (PCE), IPOP
11 02 Automated Multi-layer Provisioning < Seconds < Seconds Seconds/Minutes 11
12 03 Multi-layer restoration
13 03 Multi-layer Restoration Multi-layer restoration consist on using the increased DWDM layer connectivity and dynamicity to recover both layer failures. Multi-layer restoration allows to increase availability due to the higher number of resources to drive traffic available. Access Region 2 Transit R2 Interconnection Access R1 Transit R1 Transit Backup R3 Transit R3 Access R3 The Economics of Next-Gen ROADM Networks, Heavy Reading September
14 03 Multilayer restoration: Alternatives comparison 1+1 Protection and Multilayer Restoration 1+1 Protection, multilayer restoration (additional router) Multilayer restoration only OPEX Reduction Highest reduction No change CAPEX No change Increase Reduction Failure recovery time 1 st failure: 50 ms 2 nd failure: 1 minute (approx) without FRR 1 st failure: 50 ms 2 nd failure: 50 ms 1 st failure: 1 minute (approx) without FRR 2 nd failure: 1 minute (approx) without FRR 14
15 04 Demonstrations
16 FP7 STREP ONE Project
17 04 ONE project The project has three main contributions: A Network Management Adapter Semantic Adaptation A Programmable Management Framework ONE adapter enables: Dynamic IP service provisioning. Automatic IP Offloading. Multi-layer Restoration. IP%Network%Management%Ecosystem% % % IP8NMS% % % % NM#Adapter Adapter Front:end Ontology#Mapper Management# Module Operation#Workflow# Database % % % % % T8NMS% Transport%Network%Management%Ecosystem% ONDM 2012, UK The Internet and Transport Network Management Ecosystems: A Roadmap Toward Convergen 17
18 04 Building blocks Execute the process orchestration inside the ONE core Responsible of the ONE adapter configuration Enable interoperability between two network management layers Store the orchestration and workflows for the processes 18
19 Coordinated Provisioning (Human-initiated case) 04 Example of ONE adapter operation Automatic IP Link Provisioning IP Network Management Layer Web Services Event Trigger and Notification PCE L3 PCE NM Adapter NM Adapter L1/L2 PCE Monitoring Infrastructure 6 Multilayer TED 4 5 Front-end Management Module Ontology Mapper Operation WorkFlow Database 8 MTOSI Web Services 9 10 Transport Network Management Layer ONDM 2012, UK 19 The Internet and Transport Network Management Ecosystems: A Roadmap Toward Convergence 14
20 O2 Germany Field Trial
21 04 O2 Germany Field Trial Multi-layer operation is demonstrated in an O2 field trial with ONE adapter. Network scenario: equipment from Juniper (MX-240). Optical transport equipment from ADVA. UNI interface between Juniper and ADVA. Multi-layer Manager The Multi-layer Manager is used for: Supervise joint network configuration. Automatic configuration based on network information. Restoration under failure situation. 21
22 04 O2 Germany Data Plane Topology ROSTOCK SCHWERIN Configuration via CLI Multi-layer Manager MX-80 R_ONE MX-80 R_TWO MX-80 R_THREE UNI ADVA THREE ADVA ONE ADVA TWO HAMBURG 22
23 04 O2 Germany Field Trial - Tests Test Summary: GMPLS path creation and deletion via UNI Automatic IP Link Provisioning Automatic IP Offloading Multi-layer Restoration 23
24 05 Further steps
25 05 Multi-layer target architecture Current Isolated layers Manual Coordination Automated Coordination Integration? Layer Photonic Transport Layer UNI Layer Photonic Transport Layer Ext. UNI Layer Photonic Transport Layer PCE + Transport Lack of Standardization Interoperability Inefficient resource utilization Manual operation (IP and transport) Duplicated protection Automated operation (only at transport level) Improved resource utilization Automated operation (MPLS and transport) Coordinated protection The target multi-layer control plane to enable automatic operation and coordinated protection is Optimum resource utilization based on: Hierarchical LSPs and Forwarding Adjacencies à Scalability. Extended UNI interface: UNI enables automatic transport connection set-up. Extended UNI allows multi-layer information dissemination (TE-link, SRLGs, etc.), simplifying operation and resource utilization. Multi-layer PCE à Enable scalable resource optimization and interconnection. Configuration mechanisms enabling automated IP routers configuration according to the new physical topology (e.g NetConf, OpenFlow). VNTM is required for this operation 25
26 05 Data Plane Integration Separate model Integrated model Transceiver SR Transceiver SR Tx Tx Rx Tx Rx Rx Tx Rx λ 1 λ 1 OXC Chassis WDM Termninals Transponders Router Line Cards Transceiver LR Tx Rx Tx Rx λ 1 λ 1 OXC Chassis 26
27 05 Data Plane Integration - Results Based on current traffic in Telefonica of Spain network, traffic is increased each year 50%. CAPEX reduction in the core network Integrated Port Cost = IP Card % 29.2% Transponder SFPs cost Integrated Port Cost + Ongoing 30% Work 8.4% 22.1% Integrated port cost is varied since its price is not clear CAPEX savings are great but data plane integration implies: Department integration. Control plane interoperability between multiple optical equipment vendors. And optical compatibility of the integrated transponders so multiple vendors can use integrated transponders. Multi-layer coordination will do this No effort in industry so far 27
28 05 Software Define Networks for Multi-layer Architectures SDN appears as the old promise of real-time programmability of network functionalities. Applications North Bound Interface SDN Controller SDN Orchestrator Discovery Provisioning Monitoring Why not control a ML-network? ONE project third year 28
29 05 Integration with Elastic Networks The elastic optical network can be configured based on: Monitoring probes Network status Service Configuration can be done using: Control plane Management plane E2E monitoring information Router i/f Online algorithms Router i/f TED COMMON CONTROL PLANE idealist Router 100G Tx 100G Tx 100G Rx 100G Rx Router 29
30 06 Final Remarks
31 06 Final Remarks 1 Automated multilayer coordination enables: Savings Network resources optimization (CAPEX reduction) Operation simplification (OPEX reduction) 2 ML Architecture Based on based on a combination of standardized elements such as: extended UNI, multilayer PCE and VNTM enable multilayer interworking in multivendor networks 3 Standardization Some standardization is required: Extended UNI VNTM SDN? 31
32 32
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