Service Function Chaining Based on Grammar in Software Defined Networks

Document Type : Computer Article


1 Islamic Azad University Yazd branch

2 Department of Engineering, Yazd Branch, Islamic Azad University, Yazd, Iran

3 Faculty of Electrical and Computer Engineering, University of Yazd, Yazd, Iran.

4 . Department of Computer Engineering, Shahrekord Branch, Islamic Azad University, Shahrekord, Iran


Service Function Chaining is an architecture for orchestrating network services that assign choice to the network. This architecture is essentially a policy structure that should form the proper chain of services. Managing these networks is susceptible to error due to the combination of services with dedicated configurations. Accordingly, solutions will be needed to provide an appropriate ambiance for such a situation. Therefore, before running, the chains must be fully controlled, which requires the definition of chaining rules. Among the issues raised in this architecture are: checking the accuracy of the chains, as well as reducing the number of combinations of service chains. To solve these issues, the grammar is used in this paper. In this way, based on the scenarios in the Internet Engineering Task Force, they first create them and then their grammar is obtained using Regular Expressions and Finite Automaton. Subsequently, using the Cocke–Younger–Kasami algorithm, the grammar evaluation is performed and the number of combinations of services is also shown. The results show that this grammar can be verified by checking the service chain and also significantly reducing the number of combinations of service chains.


Main Subjects

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