Method for speeding up internet protocol address lookups with efficient use of memory

摘要

The method includes the following steps: First, establishing two Prefix Information Tables (PITs), PIT-m and PIT-n, for partitioning the Trie into several segments to map into all IP addresses in the Internet. Then looking up a Best Matching Prefix (BMP) for the Internet Protocol address through the PIT-m and the PIT-n for finding an output port or for finding the Lookup Table (LT) corresponding to the IP address. Finally, checking up the LT for finding the BMP, and the exact output port is thus obtained.