Conference Paper

Hardware implementation of fast forwarding engine using standard memory and dedicated circuit

Grad. Sch. of Eng., Osaka City Univ., Osaka, Japan
DOI: 10.1109/ICECS.2010.5724532 Conference: Electronics, Circuits, and Systems (ICECS), 2010 17th IEEE International Conference on
Source: IEEE Xplore

ABSTRACT

Ternary content addressable memory (TCAM) is becoming very popular for designing high-throughput forwarding engines on routers. However, TCAM has potential problems in terms of cost of hardware and cost of power, which limits it deploying large amounts of capacity. In this paper, we propose a new hardware architecture for a fast forwarding engine that fundamentally solves the potential problems of TCAM. We also develop a hardware design for our architecture. Our results show that the proposed hardware reduces the costs of hardware resources needed and power consumption into 62% and 52%, respectively.

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    ABSTRACT: Ternary content addressable memory (TCAM) is popular LSI for use in high-throughput forwarding engines on routers. However, the unique structure applied in TCAM consume huge amounts of power, therefore it restricts the applicability to deployment for handling large lookup-table capacity in IP routers. In this paper, we propose a commodity-memory based hardware architecture for the forwarding information base (FIB) application that solves the substantial problems of power and density. The proposed architecture is examined by fabricated test chip with 40nm embedded DRAM (eDRAM) technology, and the effect of power reduction verified is 95% lower than conventional TCAM based.
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