N
Group0/1:
Yangfei WANG z3471101
Amrita Manayil z3479501
Thangappan Madavan V K z5012717
Peng Fu z3452815
Shuo Sun z3486412
Total Slides :19
Never Stand Still Faculty of Engineering Electrical Engineering and Telecommunication
In-Operation Network Planning
• Traditional statical transport networks deal with limited network traffic.
• Statical networks can’t meet the uncertain network traffics surge.
• In-operation planning methods help to reconfigure networks automatically to meet uncertain network demands.
• Deals with Fault, Configuration, Accounting& Performance Managements. (FCAPS)
Abstract
Never Stand Still Faculty of Engineering Electrical Engineering and Telecommunication
• Traditional Network planning is a offline process
• Current transport and IP/MPLS layers are static and inflexible
• High Operational Expenditures (OPEX)
• Capacity over provisioning increases capital expenditures (CAPEX)
Traditional Network Planning
Never Stand Still Faculty of Engineering Electrical Engineering and Telecommunication
• Auto fashioned real time reconfiguration and reoptimization possible with light provisioning support
• Minimizes over provisioning and so reduces CAPEX
In-Operation Network planning Never Stand Still Faculty of Engineering Electrical Engineering and Telecommunication
Implementing In-Operation Planning Never Stand Still Faculty of Engineering Electrical Engineering and Telecommunication
• Generalize MPLS Control planes for real time system recovery
• Add functional block between service and network layers
• North bound Interface
- Entry point for planned configuration and Multiple Service Provision
• South bound Interface
- Provisioning, Monitoring & Info retrieval
Traditional network planning
In-operation network planning
Traditional VS In-operation Planning Never Stand Still Faculty of Engineering Electrical Engineering and Telecommunication
• ABNO Controller - Network entrance point for NMS/OSS
- Service layer entrance point for provisioning & Network
coordination
- Forward requests to PCE
• PCE - Serve path computation requests
- PCE communication protocol (PCEP) carry path computation requests and PCE responses
- Uses Border Gateway Protocol Link state (BGP-LS) to gather
network topology and current network resources details
ABNO Architecture
Never Stand Still Faculty of Engineering Electrical Engineering and Telecommunication
• Process requests based on TE or Label switch path database (LSP - DB)
• Virtual Network Topology Manager (VNTM) co-ordinates virtual network topology
• The operations, administration & maintenance handler (OAM) responsible for for fault detection and correction.
ABNO Architecture
Never Stand Still Faculty of Engineering Electrical Engineering and Telecommunication
Case I: Virtual Topology Reconfiguration
Virtual topology reconfiguration
after a failure
disaster recovery
• Virtual topology reconfiguration includes management functional areas as follows:
- Fault management- Configuration management- Accounting management- Performance management
Never Stand Still Faculty of Engineering Electrical Engineering and Telecommunication
A multilayer network consisting of four OXCs in the optical layer and three routers in the IP layer.
After Failure-Fast reroute-State update-Virtual topology reconfiguration
Virtual Topology Reconfiguration Disaster Recovery
Never Stand Still Faculty of Engineering Electrical Engineering and Telecommunication
Request from the NMS/OSS
ABNO controller(1)
PCE(2)
Back-end PCE(3)
Active solver(4)
(PCRep) message (5)
NO CHANGE
New (virtual) layout
Final approval(7)
ABNO controller (6)
New optimized layout (8)
VNTM(9)
provisioning manager (10)
A new lightpath is created between R1 and R2, and as a result R2-R3 can be rerouted .
Virtual Topology Reconfiguration Disaster Recovery
Never Stand Still Faculty of Engineering Electrical Engineering and Telecommunication
Virtual Topology Reconfiguration Disaster Recovery
• Steps involved:
1. Immediate action by the network to recover some of the traffic2. Dissemination of the new network state3. Root cause analysis to understand what failed and why4. An operator-assisted planning process to come up with a disaster
recovery plan5. Execution of the plan, possibly in multiple steps6. Reconvergence of the network after each step and in its final state7. Reuse the resources for post-disaster priority connections.
Never Stand Still Faculty of Engineering Electrical Engineering and Telecommunication
• Routes and spectrum allocation is done considering the state of network resources.
• Re-routing is done to remove bottlenecks and congestion.
• Re-Optimization is used to improve network efficiency.
Case II Study( Re-Optimization) Never Stand Still Faculty of Engineering Electrical Engineering and Telecommunication
Case II Study( Re-Optimization)
The width of the slot is a function of requested bit rate, FEC and modulation format.
Never Stand Still Faculty of Engineering Electrical Engineering and Telecommunication
Case II Study( Re-Optimization) Never Stand Still Faculty of Engineering Electrical Engineering and Telecommunication
Router A
Control Plane
Router B
PCReq
PCE
back-end PCE
Result of Computationfront-end PCE
NMS/OSS
ABNO Controller
1
2
3
4
56
Provisioning Manager
7
Flexi-grid core network
PCE: Path Computation Element PCR: Pat Computation Reply ABNO: Application-Based Network Operations
References List
Never Stand Still Faculty of Engineering Electrical Engineering and Telecommunication
1.Velasco, L., Castro, A., King, D., Gerstel, O., Casellas, R., & Lopez, V. (2014). In-operation network planning. Communications Magazine, IEEE, 52(1), 52-60.
2. Jajszczyk, A. (2005). Automatically switched optical networks: benefits and requirements. Communications Magazine, IEEE, 43(2), S10-S15.
3. Ash, J., & Farrel, A. (2006). A path computation element (PCE)-based architecture.
4. Gredler, H., Medved, J., Previdi, S., Farrel, A., & Ray, S. (2013). North-bound distribution of link-state and TE information using BGP. ID draft-ietf-idr-lsdistribution-03.
Never Stand Still Faculty of Engineering Electrical Engineering and Telecommunication
Thank you !