Abstract
This paper proposes a power and time efficient scheme for designing IP lookup tables. The proposed scheme uses partitioned Ternary Content Addressable Memories (TCAMs) that store IP lookup tables. The proposed scheme enables O(1) time penalty for updating an IP lookup table. The partitioned TCAMs allow an update done by a simple insertion without the need for routing table sorting. The organization of the routing table of the proposed scheme is based on a partition with respect to the output port for routing with a smaller priority encoder. The proposed scheme still preserves a similar storage requirement and clock rate to those of existing designs. Furthermore, this scheme reduces power consumption due to using a partitioned routing table.
Highlights
IP routers have been growing more complex with each passing year
The step is to access the SRAM cells that correspond to the matched prefixes from the Ternary Content Addressable Memories (TCAMs) search to determine the length of the prefix
The purpose of IP router is to make a decision on a routing path to use and to forward a packet corresponding to the decided route
Summary
IP routers have been growing more complex with each passing year. These routers must continually support new features such as Quality of Service and Service Level Agreement monitoring, and they must perform these services at an increasing pace to match new connection speeds. The most critical issues are related to performance degradation, which occurs when a new entry is inserted into the table and due to the limitations imposed by the large encoder logic. This same router may spend up to 10% of the time updating the table. The insertion time has a dramatic effect on the performance of routers with large tables [2,3]
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