Reducing OpenFlow Rule Footprint Sample Clauses

Reducing OpenFlow Rule Footprint and Setup Rate‌ Assuming that there are on average 1k simultaneous elephant flows [11] [12] between two packet switches at the upper tier, means that existing approaches require 1k OpenFlow rules for each of the packet switches, which might consume most of current OpenFlow switches flow table size. For instance, HP ProCurve 5400zl switches support up to 1.7K OpenFlow entries [9]; HP ProCurve J9451A supports 1.5k OpenFlow entries [13]; HP ProCurve 5406zl, Pica8 P-3290, and Dell PowerConnect 8132F support up to 1.5k, 2k and 750 rules, respectively [14]. Hence, the currently used per-flow setup approach results in average flow table consumption of 50%-67% for elephant flows rerouting. The significant OpenFlow entry footprint has also been observed in [15]. Since vApp requires a single OpenFlow rule for each circuit, it results in a significantly smaller OpenFlow footprint. Furthermore, OpenFlow switches have limited OpenFlow rule setup rate. For instance, [13] indicates that OpenFlow rule setup rate is limited to approximately 40 flow/sec. Clearly, vApp significantly reduces the required OpenFlow setup rate; hence, proposes feasible solution for current OpenFlow switches, as opposed to the per-flow setup approach, which results in a limited scale solution.
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