Abstract
Metropolitan area ring networks can be categorized into metro edge and metro
core rings. The traffic characteristics of metro edge and metro core rings are quite
different. While metro edge rings exhibit a strongly hubbed traffic pattern (hot
spots), traffic demands in metro core rings are much more uniform. We examine the
throughput-delay performance of a buffer insertion ring with destination stripping
and shortest path routing, which is the favored network type in the new
high-performance standard for metropolitan area ring networks, IEEE 802.17 Resilient
Packet Ring (RPR), and we investigate the ring's performance limitations under
different traffic characteristics by means of analysis and simulation. Our
probabilistic analysis considers arbitrary propagation delays, packet length
distributions, and traffic matrices. In our numerical investigations we consider
uniform, hot-spot, symmetric, and asymmetric traffic demands. Our findings show that
the throughput-delay performance of buffer insertion rings deteriorates
significantly under hot-spot traffic compared with uniform traffic. To mitigate this
drawback, we propose and investigate the novel performance-enhancing proxy-stripping
technique. Proxy stripping is used by a subset of ring nodes to send traffic across
shortcuts of a dark-fiber star subnetwork. Our results show that proxy stripping
dramatically improves the throughput-delay performance of buffer insertion rings not
only under uniform traffic but also, in particular, under hot-spot traffic. Finally,
we address the trade-offs of the proxy-stripping technique.
© 2005 Optical Society of America
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