Abstract
Hotspot traffic is common in metro ring networks connecting access networks with backbone networks, and these
metro rings are also expected to support a mix of unicast, multicast, and broadcast traffic. Shortest path (SP)
routing, as employed in the IEEE 802.17 Resilient Packet Ring (RPR), is widely considered for metro rings as it
maximizes spatial reuse and, thus, the achievable packet throughput (capacity) for uniform traffic. In this paper,
we analyze the capacity of bidirectional optical ring networks, such as RPR, employing SP routing for multicast
(nonuniform) hotspot traffic (whereby unicast and broadcast are considered as special cases of multicast). We find
that, when the traffic originating at the hotspot exceeds a critical threshold, then SP routing leads to substantial
reductions in capacity to a value close to one simultaneous packet transmission. To overcome this limitation of SP
routing, we propose a simple combined SP/one-copy routing strategy that provides a capacity of at least two
simultaneous packet transmissions.
© 2007 IEEE
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