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Fast IP Routing with LC-Tries

By Stefan Nilsson and Gunnar Karlsson, August 01, 1998

One of the bottlenecks of the Internet is the address lookup operations performed by routers. Stefan and Gunnar show how to perform the lookups efficiently with a simple data structure--a level-compressed trie.
Dr. Dobb's Journal August 1998: Fast IP Routing with LC-Tries

Fast IP Routing with LC-Tries

By Stefan Nilsson and Gunnar Karlsson

Dr. Dobb's Journal August 1998 

node = T[0];
pos = node.skip;
branch = node.branch;
adr = node.adr;
while (branch != 0) {
   node = T[adr + EXTRACT(pos, branch, s)];
   pos = pos + branch + node.skip;
   branch = node.branch;
   adr = node.adr;
}
return adr;

Example 1: Pseudocode for finding the string s in the LC-trie T.

Copyright © 1998, Dr. Dobb's Journal


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