Abstract
This paper proposes an elaborate route prefix caching scheme for fast packet forwarding in named data networking (NDN) which is a next-generation Internet structure. The name lookup is a crucial function of the NDN router, which delivers a packet based on its name rather than IP address. It carries out a complex process to find the longest matching prefix for the content name. Even the size of a name prefix is variable and unbounded; thus, the name lookup is to be more complicated and time-consuming. The name lookup can be sped up by using route prefix caching, but it may cause a problem when non-leaf prefixes are cached. The proposed prefix caching scheme can cache non-leaf prefixes, as well as leaf prefixes, without incurring any problem. For this purpose, a Bloom filter is kept for each prefix. The Bloom filter, which is widely used for checking membership, is utilized to indicate the branch information of a non-leaf prefix. The experimental result shows that the proposed caching scheme achieves a much higher hit ratio than other caching schemes. Furthermore, how much the parameters of the Bloom filter affect the cache miss count is quantitatively evaluated. The best performance can be achieved with merely 8-bit Bloom filters and two hash functions.
Highlights
The Internet has provided many application services for several decades by means of exchanging packets between two hosts, where one consumes information and the other produces it
The Named data networking (NDN) is composed of numerous nodes, which can be categorized into hosts and routers, as well as communication links connecting them, as the Internet is
We used the route prefixes that came from a name set dmoz [24] because there is currently no real route prefix table for NDN
Summary
The Internet has provided many application services for several decades by means of exchanging packets between two hosts, where one consumes information and the other produces it. In other words, it is a host-centric network in which a consumer generates a packet destined for a producer’s IP address, and intermediate routers forward the packet based on the destination address. The current Internet with such a communication pattern is gradually revealing its limitation in providing rapidly increasing information-oriented services. Named data networking (NDN) [1,2] is one of the representative Internet structures of the future It enables a growing number of information-based services to be deployed efficiently and effectively as packets are delivered based on the content name rather than the destination IP address. The producer replies with the data packet which contains the data associated with the name
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