IP Route Lookups as String Matching
نویسندگان
چکیده
An IP route lookup can be considered as a string matching problem on the destination address. Finite State Automata (FSA) are a flexible and efficient way to match strings. This paper describes how a routing table can be encoded as an FSA and how, through a process of state reduction, we can obtain an optimal representation. This gives insights into the basic properties of the longest-prefix match problem.
منابع مشابه
Binary search schemes for fast IP lookups
IP route look up is the most time consuming operation of a router. Route lookup is becoming a very challenging problem due to the increasing size of routing tables. To reduce the number of entries, routing tables store variable length address prefixes. To determine the outgoing port for a given address, the longest matching prefix amongst all the prefixes, needs to be determined. This makes the...
متن کاملIP-Address Lookup Using Hardware Pipelining
Fast IP address lookup mechanism is a major design issue for the next generation routers. The existing scheme performs the IP address lookup by hardware in which the forwarding table can be compressed to fit into reasonable-size SRAM, and a lookup can be accomplished in three memory accesses. In this article, we claim that with a little extra memory, it is able to further reduce the lookup time...
متن کاملA High Performance Parallel IP Lookup Technique Using Distributed Memory Organization and ISCB-Tree Data Structure
The IP Lookup Process is a key bottleneck in routing due to the increase in routing table size, increasing traıc and migration to IPv6 addresses. The IP address lookup involves computation of the Longest Prefix Matching (LPM), which existing solutions such as BSD Radix Tries, scale poorly when traıc in the router increases or when employed for IPv6 address lookups. In this paper, we describe a ...
متن کاملA High Performance Parallel IP Lookup Technique Using Distributed Memory Organization and ISCB-Tree Data Structure
The IP Lookup Process is a key bottleneck in routing due to the increase in routing table size, increasing traıc and migration to IPv6 addresses. The IP address lookup involves computation of the Longest Prefix Matching (LPM), which existing solutions such as BSD Radix Tries, scale poorly when traıc in the router increases or when employed for IPv6 address lookups. In this paper, we describe a ...
متن کاملA Time Efficient Algorithm Based on Bloom Filters for Longest Prefix Matching in IP Lookups
A time efficient algorithm based on Bloom filters is proposed to solve the problem of longest prefix matching in IP lookups. It is distinguished from the existing algorithms by three features. Firstly, a first-byte indexing table is established before querying the Bloom filters, so that the impact of positive false inherent to Bloom filters on IP lookups is reduced. Secondly, only twelve Bloom ...
متن کامل