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 !