New Approach for Efficient IP Address Lookup Using a Bloom Filter in Trie-Based Algorithms

PROJECT TITLE :

New Approach for Efficient IP Address Lookup Using a Bloom Filter in Trie-Based Algorithms

ABSTRACT:

IP address lookup operation determines the longest prefix matching every incoming destination address. As a fundamental operation for packet forwarding at Web routers, search speed for routing table lookup is the most vital performance metric. Previous researches have shown that the search performance of trie-based mostly algorithms will be improved by adding on-chip Bloom filters. In these algorithms, an on-chip Bloom filter identifies the membership of a node in an off-chip trie, and the quantity of trie accesses is reduced, because the Bloom filter will filter out accesses to non-existing nodes in the trie. In this paper, we propose a brand new methodology of utilizing a Bloom filter for the IP address lookup drawback. Within the previous Bloom filter-based approach, false positiveness has to be identified by accessing the off-chip trie for every positive result, since false positives can produce wrong results. In our proposed approach, the false positiveness of a Bloom filter is not necessarily identified by creating false positives not mislead the search. Hence the quantity of off-chip trie accesses are considerably reduced. Simulation results show that the best matching prefix will be found with a single off-chip access in average and within the worst-case with the affordable size of a Bloom filter in our proposed technique.

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