Formal Specification, Verification, and Automatic Test Generation of ATM Routing Protocol: PNNI

1. Introduction

For the reliability of atm networks, there is an urgent need to establish some dinner gown methods in validating these protocols and in generating discharge cases. The tools needed to accomplish these purposes include: a technique to archetype the protocol, a formal description language to describe the model, a protocol simulator to perform verifications, and a test generator to fix test cases. This work is a case study of applying formal verification and test generation tools to the ambiance network routing protocol, or the ATM Forum Private Network-Network Interface (PNNI) Specification form 1.0 [1].

The PNNI specification consists of three layers of protocols: the Hello protocol for identifying the status of NNIs; the Database synchronization protocol for maintenance of routing databases; and the Peer Group Leader alternative protocol for operations of hierarchical routing. Each of the PNNI sub-protocols can top hat be modeled as communicating Extended exhaustible State Machines (EFSM) with parameters [2]. The system behavior of the PNNI protocol system is the combine effects of three communicating EFSMs. The issue at elapse is: Is it necessary to develop a complete composite severalise machine to correctly model PNNI, and if so, how? Furthermore, since a PNNI system represents an ATM network transposition node, within a network switching nodes argon expected to interact with each other. Therefore what is the token(prenominal) number of nodes needed to correctly simulate the operation of PNNI?

In our study, we submit two nodes connected by a adequate-duplex channel, based on the following observations.



We want to detect design/specification illusions from verification, instruction execution errors from conformance testing, and errors from both the design and implementation from interoperability testing. Suppose that an error is revealed using a two-node model, then obviously, faults in the specification are detected. Conversely, suppose that there are faults in PNNI in a...

I induce no idea who wants to know wo much about the inarards of ATM mechines and what class would ask you to write such a expatiate paper about ATMs.

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