Publication 2004 Issue No. 10 - October Abstract - O(\log n) Dynamic Router-Tables for Prefixes and Ranges
O(\log n) Dynamic Router-Tables for Prefixes and Ranges
October 2004 (vol. 53 no. 10)
pp. 1217-1230
 ASCII Text x Haibin Lu, Sartaj Sahni, "O(\log n) Dynamic Router-Tables for Prefixes and Ranges," IEEE Transactions on Computers, vol. 53, no. 10, pp. 1217-1230, October, 2004.
 BibTex x @article{ 10.1109/TC.2004.81,author = {Haibin Lu and Sartaj Sahni},title = {O(\log n) Dynamic Router-Tables for Prefixes and Ranges},journal ={IEEE Transactions on Computers},volume = {53},number = {10},issn = {0018-9340},year = {2004},pages = {1217-1230},doi = {http://doi.ieeecomputersociety.org/10.1109/TC.2004.81},publisher = {IEEE Computer Society},address = {Los Alamitos, CA, USA},}
 RefWorks Procite/RefMan/Endnote x TY - JOURJO - IEEE Transactions on ComputersTI - O(\log n) Dynamic Router-Tables for Prefixes and RangesIS - 10SN - 0018-9340SP1217EP1230EPD - 1217-1230A1 - Haibin Lu, A1 - Sartaj Sahni, PY - 2004KW - Packet routingKW - dynamic router-tablesKW - longest-prefix matchingKW - most-specific-range matchingKW - conflict-free ranges.VL - 53JA - IEEE Transactions on ComputersER -
Two versions of the Internet (IP) router-table problem are considered. In the first, the router table consists of n pairs of tuples of the form (p,a), where p is an address prefix and a is the next-hop information. In this version of the router-table problem, we are to perform the following operations: insert a new tuple, delete an existing tuple, and find the tuple with longest matching-prefix for a given destination address. We show that each of these three operations may be performed in O(\log n) time in the worst case using a priority-search tree. In the second version of the router-table problem considered by us, each tuple in the table has the form (r,a), where r is a range of destination addresses matched by the tuple. The set of tuples in the table is conflict-free. For this version of the router-table problem, we develop a data structure that employs priority-search trees as well as red-black trees. This data structure permits us to perform each of the operations insert, delete, and find the tuple with most-specific matching-range for a given destination address in O(\log n) time each in the worst case. The insert and delete operations preserve the conflict-free property of the set of tuples. Experimental results are also presented.

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Index Terms:
Packet routing, dynamic router-tables, longest-prefix matching, most-specific-range matching, conflict-free ranges.
Citation:
Haibin Lu, Sartaj Sahni, "O(\log n) Dynamic Router-Tables for Prefixes and Ranges," IEEE Transactions on Computers, vol. 53, no. 10, pp. 1217-1230, Oct. 2004, doi:10.1109/TC.2004.81