This paper shows an area-efficient and high-speed architecture for IPv6 lookup using a parallel index generation unit (IGU). To reduce the size of memory in the IGU, we use a liner transformation and a row-shift decomposition. Also, this paper shows a design method for the parallel IGU. A single memory realization requires O(2~n) memory size, where n denotes the length of prefix, while the IGU requires O(nk) memory size, where k denotes the number of prefixes. In IPv6 prefix lookup, since n is at most 64 and k is about 340 K, the IGU drastically reduces the memory size. Since the parallel IGU has a simple architecture compared with existing ones, it performs lookup by using complete pipelines. We loaded more than 340 K IPv6 pseudo prefixes on the Xilinx Virtex 6 FPGA. Its lookup speed is higher than one giga lookups per second (GLPS). As for the normalized area and lookup speed, our implementation outperforms existing FPGA implementations.
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