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Fast IP routing lookup with configurable processor and compressed routing table

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2 Author(s)
Ji, H.Michael ; Tensilica, Inc., Santa Clara, CA, USA ; Srinivasan, R.

We examine a primitive data structure for routing lookup called 24/8 which requires about 32 MB memory to store the routing table information. A novel compression algorithm is used to reduce the memory requirement to about 3 MB. The data structure is common for both route lookup and update. We present a fast route lookup algorithm and an efficient update algorithm that supports incremental route update. A configurable processor is used to achieve fast IP route lookup. Through configuring the processor properly and developing a few customized instructions specifically for route lookup, we can achieve up to 66 million lookups per second (MLPS) for the processor at 200 MHz

Published in:

Global Telecommunications Conference, 2001. GLOBECOM '01. IEEE  (Volume:4 )

Date of Conference:

2001

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