On achieving LSP/λSP multiplexing/separation in converged data/optical networks

• 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.

Ämnesord

TEKNIK OCH TEKNOLOGIER  -- Elektroteknik och elektronik (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Electrical Engineering, Electronic Engineering, Information Engineering (hsv//eng)

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