Fit the elephant in a box - towards IP lookup at on-chip memory access speed

Tong Yang, Alex X. Liu, Qiaobin Fu, Dongsheng Yang, Steve Uhlig, Xiaoming Li

Abstract: Fitting large and ever increasing routing tables in small on-chip memory is just like fitting an elephant in a box, which has been considered as impossible. In this paper, we propose the data structure of two-Dimensional Division Bloom Filter (D 2 BF) that can compactly encode almost all the needed information for performing IP lookup from a FIB in small on-chip memory. With pipelining, we further achieve the throughput of one packet per on-chip memory access.