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| Content Provider | ACM Digital Library |
|---|---|
| Author | Kőrösi, Attila Heszberger, Zalán Tapolcai, János Majdán, András Rétvári, Gábor |
| Copyright Year | 2016 |
| Abstract | Lately, there has been an upsurge of interest in compressed data structures, aiming to pack ever larger quantities of information into constrained memory without sacrificing the efficiency of standard operations, like random access, search, or update. The main goal of this paper is to demonstrate how data compression can benefit the networking community by showing how to squeeze the IP Forwarding Information Base (FIB), the giant table consulted by IP routers to make forwarding decisions, into information-theoretical entropy bounds, with essentially zero cost on longest prefix match and FIB update. First, we adopt the state of the art in compressed data structures, yielding a static entropy-compressed FIB representation with asymptotically optimal lookup. Then, we redesign the venerable prefix tree, used commonly for IP lookup for at least 20 years in IP routers, to also admit entropy bounds and support lookup in optimal time and update in nearly optimal time. Evaluations on a Linux kernel prototype indicate that our compressors encode an FIB comprising more than 440 K prefixes to just about 100-400 kB of memory, with a threefold increase in lookup throughput and no penalty on FIB updates. |
| Starting Page | 149 |
| Ending Page | 162 |
| Page Count | 14 |
| File Format | |
| ISSN | 10636692 |
| DOI | 10.1109/TNET.2014.2357051 |
| Volume Number | 24 |
| Issue Number | 1 |
| Journal | IEEE/ACM Transactions on Networking (TON) |
| Language | English |
| Publisher | Association for Computing Machinery (ACM) |
| Publisher Date | 2016-02-01 |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | IP forwarding table lookup Data compression Prefix tree |
| Content Type | Text |
| Resource Type | Article |
| Subject | Electrical and Electronic Engineering Computer Networks and Communications Software Computer Science Applications |
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