To accommodate the exponential growth of Internet traffic,
wavelength division multiplexing (WDM) optical networks have been
widely deployed in modern communication networks. IP (internet
protocol) over WDM is being envisioned as a more efficient
solution compared to other technologies (e.g., IP over ATM over
SONET/SDH over WDM, IP/SONET/WDM, etc.). In this paper, we discuss current issues and challenges in traffic engineering
for IP over WDM networks. In particular, we investigate practical
aspects such as architectural alternatives, routing, signaling and
survivability. Then a constraint-based routing scheme in the GMPLS
context is proposed to meet different optical quality of service
requirements. The performance of the algorithm is studied using
simulations.
As the Internet evolves into a global information infrastructure,
there is a growing need to provide quality of service (QoS)
guarantees for applications over the Internet. Multi-Protocol
Label Switching (MPLS) and Differentiated Services (Diffserv) are
two major technologies currently employed in the networking
community for this purpose. This paper proposes an approach to
traffic engineering that uses MPLS and Diffserv to enhance QoS
performance over an IP network. A novel algorithm for multiple QoS
constrained routing with imprecise link state information is
presented. Simulation is used to verify the correctness and
effectiveness of the algorithm. The service architecture and the
functionalities of various techniques of traffic engineering label
switched paths (e.g., label switched path setup, provisioning,
rerouting) are also discussed.
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