Abstract
Feature Issue on
Convergence
We revisit the concept of path multiplexing/separation and its
impact on the recovery performance in converged data/optical networks. We formulate the
rerouting of failed tunnels as a path set finding problem subject to quality of service
(QoS) and network control constraints. We solve this problem using a heuristic solution
that is based on a cost metric that (1) uses congestion in the optical layer to guide
routing decisions and (2) engineers converged multiprotocol label switching networks and
multiprotocol lambda switching (MPLS/MPλ S) networks to achieve path
multiplexing/separation when rerouting the label switched paths (LSPs) and the lambda
switched paths (λ SPs). We apply this solution to achieve multilayer resilience using a
mixed scheme where protection switching is complemented by path restoration. We evaluate
the performance of this scheme when rerouting the tunnels carrying the traffic offered
to 15- and 23-node networks. Simulation reveals performance improvements of the proposed
scheme when compared with classical recovery schemes that use several other existing
algorithms such as minimum hop algorithm (MHA), open shortest path first (OSPF), and
widest shortest path (WSP) in terms of the rerouting efficiency and bandwidth usage
optimization.
© 2006 Optical Society of America
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