OFC’08 Summary---Backbone

NetworksDragos Andrei

OFC’08 Tracks

Category 9: Networks

OTuA, WDM Network Control OWA, Physical Impairment Aware Networking OWN, Survivable WDM Networks OWF, Optical Grids OThB, Emerging Technologies OThI, Transparent WDM Networks OThQ, WDM Networks

WDM Network Control Code Title Author/

AffiliateTopic Trends

OTuA1 Advance Reservation-Based Network Resource Manager for Optical Networks

Michiaki Hayashi / KDDI R&D Laboratories

SOA-based network architecture for provisioning services. Supports: advance reservation with time-based resource scheduling. NRM operations: virtualization, scheduling, path discovery, resource allocation

Providing reconfigurability in optical networks

OTuA2 Reconfigurable Optical Networks: Is It Worth?

Reza Roshani et al. / OpNeAR Lab, UT Dallas

What levels of traffic fluctuation justifies having reconfigurable networks? Lightpaths may be switched over time. Two options: 1) LSP rerouting; 2) Rerouting in dynamic virtual topology (LPS RR). Useful when traffic fluctuations exceed certain value

OTuA3 Field Trial of GMPLS-Controlled All-Optical Networking with Optical Performance Monitors

Jun Haeng Lee / KDDI R&D Laboratories, Japan

Reliable network operation with OPMs for monitoring in-band OSNR. Issues regarding monitoring signal quality in optical layer .

WDM Network Control – Contd.Code Title Author Topic Trends

OTuA4

Introducing Crosstalk-Awareness into GMPLS-controlled transparent optical networks

N. Sambo/ Scuola Superiora Sant’Anna, Pisa

Solution based on RSVP-TE signaling to solve degradation due to crosstalk. Lightpaths in all-optical need ensured signal quality.

Physical impairments in transparent optical networks

OTuA5

Enhancing Backward Recursive PCE-based Computation (BRPC) for Inter-Domain Protected LSP Provisioning

Francesco Paolucci / Scuola Superiora Sant’Anna

PCE-based scheme to compute protected LSPs in multi-domain networks. PC across domains – complicated by limited visibility of TE information (restricted to single domain). 1) Per-domain PC –no info sharing; 2) BRPC – collaboration between multiple PCEs

OTuA6

Event-Triggered Reprovisioning with Resource Preemption in WDM Mesh Networks

Ming/

UCDavis

Reallocates network resources when events occur, so that SLA violations are minimized. Free bandwidth is used, or backup paths are preempted and given where needed.

WDM Network Control – Contd.Code Title Author Topic Trends

OTuA7

Provisioning of Deadline-Driven Requests with Flexible Transmission rates in Different WDM Network Architectures

Dragos/ UC Davis

Provision DDRs by allowing different bandwidth rates, so that network throughput is maximized

Physical Impairment Aware NetworkingCode Title Author/

AffiliateTopic Trends

OWA1Physical impairments in all-optical networks

Maurice Gagnaire / Ecole Nationale Superieure (ENST), France

Transparent lightpaths in all-optical networks are conditioned by WCC and QoT requirements. Minimize CAPEX/OPEX for regenerator placement. Impairments considered: ASE, PMD, ICX.

Handling physical impairments in all-optical

OWA2

Physical Impairment Based Regenerator Placement and Routing in Translucent Optical Networks

S. Pachnicke / University of Dortmund

Constraint-based routing (CBR) alg. Considers linear/nonlinear impairments. CBR & intelligent regenerator placement decreases blocking probability.

OWA3

Outage Dynamics of 40Gb/s Optical Paths Routed over PMD-Impaired Fiber Links

Henning Bulow / Alcatel-Lucent Research, Germany

PMD-aware routing over 40Gbps channels, outage events of 2min to 7 hrs. Insight of PMD links – analysis of a ring

Physical Impairment Aware Networking – Contd.Code Title Author/

AffiliateTopic

OWA4

Degraded-Service Aware Multipath Provisioning in Telecom Mesh Networks

Rajesh / UCDavis

Minimize link loads (load balancing) and guarantee fraction of bw. even in case of failures.

OWA5

Physical Layer Impairment (PLI) Aware Transponder Selection Policies for GMPLS/ WDM Optical Networks

Chava Saradhi / Create-Net, Italy

GMPLS is extended to be PLI-aware.

Extend RSVP-TE protocol to handle transponder params, availability and propose 2 PLI selection policies: worst-first/best-first.

Signaling-based approach: route computation = OSPF without PLI; RSVP –PLI aware. Worst-first = better w.r.t blocking.

OWA6

Determination of the impact of a quality of transmission estimator margin on the dimensioning of an optical network

Florence Leplingard / Alcatel-Lucent R&D, France

Because of the physical degradation of signal, we must estimate the performance of each lightpath, and incorporate it in Impairment Constraint-based Routing algs.

Paper provides a Q= f(QoT) estimator that maps the different parameters.

Physical Impairment Aware Networking – Contd.Code Title Author/ Affiliate Topic

OWA7

Capacity Allocation in Optical Networks under Dynamic Lightpath Demands

Gangxiang Shen, R. Tucker / Univ. of Melbourne

Approach for planning and capacity allocation in greenfield and incremental optical networks under dynamic lightpath demands. This approach outperforms conventional designs from BP perspective.

Survivable WDM NetworksCode Title Author/Affiliate Topic Trends

OWN1Survivable Optical Grids

Xin Liu, Chungming Xiao, Ting Wang / SUNY Buffalo, NEC Labs

Schemes that address failure resilience & task scheduling in optical grids. Q: How to complete a job even after a previously scheduled lightpath fails? Compare a protection vs. restoration scheme.

Multiple failures survivability

OWN2

Cross-Layer Survivability in WDM Networks with Multiple Failures

Kayi Lee, E. Modiano / MIT, Cambridge

Study survivable lightpath routing problem, for multiple failures. Algs for maximizing survivability. Notion of surviv. routing. Use 2 metrics for survivability: 1) Min Cross Layer Cut, 2) Min Weighted Load Factor

OWN3

Multi-Layer Resilient Design for Layer-1 VPNs

Cicek / UCDavis

Layer-1 VPN design problem. It solves the problem of 1) determine lightpath connectivity (virtual topology), 2) route these lightpaths in a survivable way.

Survivable WDM Networks –Contd.Code Title Author/

AffiliateTopic

OWN4

An Agile Lightpath Provisioning Paradigm for IP over WDM Optical Networks

Chunsheng Xin Norfolk State Univ. Virginia

Agile lightpath provisioning, and a lightpath can be obtianed through partitioning & concatenation operations. It significantly reduces lightpath provisioning time. Methodology to overpass the drawbacks of OCS with reconfiguration needs.

OWN5

Achieving Optimal Lightpath Scheduling in Survivable WDM Mesh Networks

Wenda Ni, X. Zheng, Tsinghua Univ, Beijing

Periodic reoptimization of backup paths over holding time of scheduled traffic is proposed in Shared Path Protected networks. 9% savings in average spare capacity consumption is achieved.

OWN6

Accumulated-Downtime-Aware Restoration Approach for Dynamic SLA-Differentiated Services in Survivable Networks

Lei / UCDavis

A restoration scheme which considers accumulated downtime and SLA requirements of faulty connections. An affected connection is only switched to its backup (or alternate route), if else it will exceed its SLA requirement.

Survivable WDM Networks –Contd.Code Title Author/Affiliate Topic Trends

OWN7

QoT-aware RWA algorithms for Fast Failure Recovery in All-Optical Networks

Amir Askarian, Suresh Subramaniam,

G. Washington University

Studies restoration algorithms in realistic phy impaired networks from time complexity viewpoint. Results show that a combination of QoT-aware path establishment and non-Qt-aware algs achieve low-blocking & small computational time complexity.

Physical impairments and survivability

OWN8

A Novel Technique for Denial of Service Identification in Optical Access Networks

Mayank Jain, Leonid Kazovsky

Stanford

Limitation of PONs in providing protection against phy layer attacks (e.g. DoS). Downstream traffic is visible to all users.

Scheme for identification of intruder causing DoS attacks (no change to ONU, only in the remote node).

Optical GridsCode Title Author/

AffiliateTopic Trends

OWF1 Distributed Computed over Optical Networks

Wei Guo / Shanghai Jiao Tong Univ.

Opportunities and challenges of distributed computing over optical network. The Terabits Optical Network Integrated Computing Environment (TONICE) project and Integrated Resources Management System (IRMS) are developed to manage comp. resources and network resources jointly.

Dynamic bw provisioning

Integrate allocation of network & grid resources

OWF2 SOA-Based Inter-Domain OVPN Service for Coordinated Scheduling of Distributed Computing

Yan Wang, et. al/ SJTU

The paper proposes a inter-domain OVPN architecture for scheduling distributed computing over optical networks. Each application is assigned its own OVPN. An example of DAG-modeled application with its own OVPN is demonstrated across two GMPLS domains

Optical Grids – Contd.Code Title Author/

AffiliateTopic Trend

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OWF3 Provisioning Lightpaths and Computing Resources for Scheduled Grid Demands with Location Transparency

Hong-Ha Nguyen, M. Gurusamy / National Univ. of Singapore

Allocate the best lightpaths and computing resources during the scheduled time-interval, so that throughput is maximized.

QWF5 A Grid-enabled Control Plane Architecture: The Phosphorus approach

D. Simeonidou / University of Essex UK

Phosphorous is a control plane solution (G2MPLS) to facilitate user controlled bw provisioning for data-intensive & e-science applications.

Phosphorous project strives to build a new “Network Control Plane” (NCP) architecture that integrates “Grid Network Services” (GNS) provisioning (by co-allocation and reservation of network and Grid computing resources).

It facilitates dynamic & automatic resource provisioning.

Emerging TechnologiesCode Title Author/

AffiliateTopic Trends

OThB1 100G and DWDM: Application Climate, Network and Service Architecture

Donald Lee / Google Mountain View

Current devices at both switching/DWDM can hardly deal with increasing bw. Ethernet switches are falling behind.

HTML augmented with video (10-100 larger), satellite imagery, huge mailboxes

Huge bandwidths to accommodate

Ethernet everywhere

OThB2 Cost-Efficient Routing in Mixed-Line Rate Optical Networks for Carrier-Grade Ethernet

Marwan / UCDavis

Routing in a mixed line rate WDM network, compared with single line-rate network.

OThB3 Carrier-Grade Ethernet over WDM under Maximum Transmission Range (TR) Constraints of Signals

Marwan / UCDavis

Determining optimal transmission range for Carrier Ethernet. Selection of TR depends on traffic volume. Also influenced on the relative cost of transceivers.

Emerging Technologies – Contd.Code Title Author/

AffiliateTopic Trends

OThB4 Cost Comparison of Networks Using Traditional 10 and 40 Gb/s Transponders Versus OFDM Transponders

Adriana Bocoi / Technische Universitat Munchen

OFDM allows flexible adjustment of transmission data rate according to channel properties. Use OFDM transponders. OFDM networks have lower CAPEX than traditional networks.

Cost of 82% - 95% of a 40Gb/s transponder would be acceptable for an OFDM transponder

Conclusions Trends

How to provide reconfigurability in Optical networks Signaling extensions to accommodate reconfigurability in

optical networks (GMPLS, RSVP)

Cross Layer Design Handle physical impairments in all-optical networks Routing in multi-domain networks Constraint-based routing and regenerator placement

Survivable optical networks Survivability considering multiple failures Availability parameter modeled by considering the real

“cumulative down time” rather than probabilistic metric Use of reprovisioning and reoptimization techniques.

Conclusions – Contd.

Trends Supporting distributed computing over optical

Grid networks Dynamic Bandwidth provisioning Allocate network resources and computational resources

Ethernet everywhere (including core networks) Needs to provide huge capacity (100 G line rate in core) to

the apps of the future Challenges of provisioning Ethernet for high bw rates

pipes, over long distances.