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Proceedings Paper

Representing structural conflicts in provisioning optical protection switching
Author(s): Joseph Kroculick; Cynthia Hood
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Paper Abstract

There are an increasing number of ways optical network devices and IP routers can interact with each other during a network fault. To provide continuity of service, the interactions between each component in a network must be cooperative. Consequently, the effect of recovery processes cooperating are the network configurations that have certain structural relationships, which can be elaborated. A conflict detector can prove that service will be restored during a fault scenario by checking whether these structural properties hold. We are using simulation as a method to study the coordination of recovery strategies and whether different coordination strategies will achieve recovery goals attached to a network service. The network service carries a traffic stream, which is injected into and extracted from a network. For multilayer recovery to complete, the cumulative effect of device actions during a failure must be (1) a connected path between the endpoints of a service and (2) a flow traffic delivered to a destination at a quality that matches a service level agreement. We represent Optical and Multiprotocol Label Switching (MPLS) recovery actions as graph-maintenance operations that change the state of a digraph. For example, the actions of forwarding traffic between an access port and a trunk port and selecting traffic from a new trunk port and forwarding it to an access port can be modeled as a sequence of edge additions and deletions. The state of the digraph represents the current configuration of a multilayer network as actions of recovery are performed. In this paper, we define some structural properties that can be observed during a simulation as the network evolves to a final state from an initial state before a failure occurs.

Paper Details

Date Published: 2 October 2006
PDF: 8 pages
Proc. SPIE 6388, Optical Transmission Systems and Equipment for Networking V, 638808 (2 October 2006); doi: 10.1117/12.686570
Show Author Affiliations
Joseph Kroculick, Winifred Associates (United States)
Cynthia Hood, Illinois Institute of Technology (United States)


Published in SPIE Proceedings Vol. 6388:
Optical Transmission Systems and Equipment for Networking V
Benjamin B. Dingel; Ken-ichi Sato; Werner Weiershausen; Achyut K. Dutta, Editor(s)

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