Shortest path routing in optical wdm ring networks under multicast traffic

Abstract

Abstract-We present an analytical model to investigate the mean hop distance of shortest path routing bidirectional optical WDM ring networks not only for multicast traffic with arbitrary fanout but also for unicast and broadcast traffic.Index Terms-Mean hop distance, multicasting, optical ring network, shortest path routing, wavelength division multiplexing.

Multicasting in a WDM-upgraded Resilient Packet Ring

“…whereby r ᐉ−1, ͑k , m͒ is the joint distribution of the largest and second largest spacing, which was derived when evaluating the distribution of G max in [6] for m Ͻ k as Figure 2 depicts the multicast capacity C M of the WDM-upgraded RPR network versus the number of nodes N for a different number of wavelengths ⌳ ͕1,2,4,8͖ under unicast traffic. Note that for unicast traffic, the multicast capacity equals the reception capacity C R .…”

“…We note that in [5], the multicast capacity is analyzed for a WDM ring with a onecopy routing strategy, which does not minimize the hop distance. In contrast, in this paper, we build on [6] where the hop distance is analyzed for a WDM-upgraded RPR network with shortest path routing, which minimizes the hop distance and maximizes spatial reuse. Due to the nonuniform loading of the ring segments in a WDM ring (even for uniform traffic), the hop distance does not directly translate into the effective capacity (maximum achievable long-run average packet throughput).…”

Comparison of routing methods in optical multicast WDM ring networks

“…In routing, there are two popular methods, shortest path tree (SPT) routing and minimum spanning tree (MST) routing. The two methods give different performance for various criteria [2,5].…”