NDLI: Chisel: A Storage-efficient, Collision-free Hash-based Network Processing Architecture

Content Provider	IEEE Xplore Digital Library
Author	Hasan, J. Cadambi, S. Jakkula, V. Chakradhar, S.
Copyright Year	2006
Description	Author affiliation: Sch. of Electr. & Comput. Eng., Purdue Univ., West Lafayette, IN (Hasan, J.)
Abstract	Longest prefix matching (LPM) is a fundamental part of various network processing tasks. Previously proposed approaches for LPM result in prohibitive cost and power dissipation (TCAMs) or in large memory requirements and long lookup latencies (tries), when considering future line-rates, table sizes and key lengths (e.g., IPv6). Hash-based approaches appear to be an excellent candidate for LPM with the possibility of low power, compact storage, and O(1) latencies. However, there are two key problems that hinder their practical deployment as LPM solutions. First, naive hash tables incur collisions and resolve them using chaining, adversely affecting worst-case lookup-rate guarantees that routers must provide. Second, hash functions cannot directly operate on wildcard bits, a requirement for LPM, and current solutions require either considerably complex hardware or large storage space. In this paper we propose a novel architecture which successfully addresses for the first time, both key problems in hash based LPM - making the following contributions: (1) We architect an LPM solution based upon a recently-proposed, collision-free hashing scheme called Bloomier filter, by eliminating its false positives in a storage efficient way. (2) We propose a novel scheme called prefix collapsing, which provides support for wildcard bits with small additional storage and reduced hardware complexity. (3) We exploit prefix collapsing and key characteristics found in real update traces to support fast and incremental updates, a feature generally not available in collision-free hashing schemes
Starting Page	203
Ending Page	215
File Size	450926
Page Count	13
File Format	PDF
ISBN	076952608X
ISSN	10636897
DOI	10.1109/ISCA.2006.14
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2006-06-17
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Delay Bandwidth National electric code Laboratories Costs Power dissipation Hardware Filters Internet Tree data structures Longest Prefix Matching. IP Lookup Packet Classification Hash Tables Bloom Filters
Content Type	Text
Resource Type	Article

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