IP over optical networks: architectural aspects

Rajagopalan, Bala; Pendarakis, Dimitrios; Saha, Diptikalyan; Ramamoorthy, Raghu; Bala, Kavita

doi:10.1109/35.868148

Cited by 134 publications

(57 citation statements)

References 9 publications

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“…As an example, b can be chosen as b 1=2jEj. Equations (7)±(10) and (12) are the same constraints as in the formulation of Section 2.1. Constraint (11) is used to set m ik to the minimum number of regenerators required to make the path feasible.…”

Section: Maximum Regeneration Demand (Mrd)mentioning

confidence: 99%

“…Signaling, routing, and management enhancements for GMPLS have been studied [6,8±10]. Different architectures and algorithms for deploying IP over optical networks have been considered [11,12]. Although GMPLS has many advantages, there are several issues that must be contemplated while applying MPLS to the optical layer, such as restoration performance [13] and the effects of physical layer limitations [14].…”

Section: Introductionmentioning

confidence: 99%

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Yetginer

Karasan

2003

Photonic Network Communications

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Abstract. In this paper, we study regenerator placement and traf®c engineering of restorable paths in generalized multiprotocol label switching (GMPLS) networks. Regenerators are necessary in optical networks in order to cope with transmission impairments. We study a network architecture where regenerators are placed only at selected nodes for decreasing cost of regeneration. We propose two heuristic algorithms for optimum placement of these regenerators. Performances of these algorithms in terms of required number of regenerators and computational complexity are evaluated. In this network architecture with sparse regeneration, off-line computation of working and restoration paths is studied for traf®c engineering with path rerouting as the restoration scheme. We study two approaches for selecting working and restoration paths from a set of candidate paths and formulate each method as an integer linear programming (ILP) problem. A traf®c uncertainty model is developed in order to compare these methods based on their robustness with respect to changing traf®c patterns. Traf®c engineering methods are compared based on number of additional demands resulting from traf®c uncertainties that can be carried over the network. Proposed heuristic regenerator placement algorithms are also evaluated from a traf®c engineering point of view.

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Section: Maximum Regeneration Demand (Mrd)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Untitled

Yetginer

Karasan

2003

Photonic Network Communications

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“…As a secondary objective, the total number of hops in the path set is minimized. This is accomplished by weighting the second term in the objective function by a small number, α. Equations (7-10) and (12) are the same constraints as in the formulation of Sect. 2.1.…”

Section: Setmentioning

confidence: 99%

<title>Traffic engineering and regenerator placement in GMPLS networks with restoration</title>

Yetginer

Karasan

2002

SPIE Proceedings

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In this paper we study regenerator placement and traffic engineering of restorable paths in Generalized Multiprotocol Label Switching (GMPLS) networks. Regenerators are necessary in optical networks due to transmission impairments. We study a network architecture where there are regenerators at selected nodes and we propose two heuristic algorithms for the regenerator placement problem. Performances of these algorithms in terms of required number of regenerators and computational complexity are evaluated. In this network architecture with sparse regeneration, offline computation of working and restoration paths is studied with bandwidth reservation and path rerouting as the restoration scheme. We study two approaches for selecting working and restoration paths from a set of candidate paths and formulate each method as an Integer Linear Programming (ILP) problem. Traffic uncertainty model is developed in order to compare these methods based on their robustness with respect to changing traffic patterns. Traffic engineering methods are compared based on number of additional demands due to traffic uncertainty that can be carried. Regenerator placement algorithms are also evaluated from a traffic engineering point of view.

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“…In the MPLS over OTN both network layers can be combined using either the overlay or the peer interconnection model [6]. In the overlay model, the MPLS and the optical layer are controlled separately and each layer has its own instance of the control plane.…”

Section: Sequential Vs Integrated Approach To the Mpls Over Otnmentioning

confidence: 99%

Optimized design of survivable MPLS over optical transport networks

Bigos

Cousin

Gosselin

et al. 2006

Optical Switching and Networking

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-In this paper we study different options for the survivability implementation in MPLS over Optical Transport Networks (OTN) in terms of network resource usage and configuration cost. We investigate two approaches to the survivability deployment: single layer and multilayer survivability and present various methods for spare capacity allocation (SCA) to reroute disrupted traffic.The comparative analysis shows the influence of the traffic granularity on the survivability cost: for high bandwidth LSPs, close to the optical channel capacity, the multilayer survivability outperforms the single layer one, whereas for low bandwidth LSPs the single layer survivability is more cost-efficient. For the multilayer survivability we demonstrate that by mapping efficiently the spare capacity of the MPLS layer onto the resources of the optical layer one can achieve up to 22% savings in the total configuration cost and up to 37% in the optical layer cost. Further savings (up to 9 %) in the wavelength use can be obtained with the integrated approach to network configuration over the sequential one, however, at the increase in the optimization problem complexity. These results are based on a cost model with actual technology pricing and were obtained for networks targeted to a nationwide coverage.

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IP over optical networks: architectural aspects

Cited by 134 publications

References 9 publications

Untitled

Untitled

<title>Traffic engineering and regenerator placement in GMPLS networks with restoration</title>

Optimized design of survivable MPLS over optical transport networks

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