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Algebraic Formal Specification and Formal Validation of the Standard and an Implementation of the OSPF Protocol  

박재현 (중앙대학교 컴퓨터공학부 초고속통신 연구실)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.29, no.3B, 2004 , pp. 360-374 More about this Journal
Abstract
The OSPF protocol is the most widely used Interior Gateway Routing Protocol. Therefore, for the reliability of behavior of gigabit swiching routers, it is essential to guarantee the interoperability and the safety of the OSPF protocol. In this paper, we analyze the standard document of the OSPF protocol, so that we provide a formal specification that specifies the protocol behaviors by detailed design level using the algebraic formal method. By referring available source codes of the OSPF protocol, we supplement the formal specification to express more detailed behaviors that is not specified definitely in the standard. We also formally verify the interoperability and the safety of the protocol state machine of the specification. By showing that the formal specification specify all of the states and the transition events that appear in the standard document of the OSPF protocol, we prove that the state machine has the completeness, and prove it has the interoperability. To prove that the specification of the protocol has the safety, we formally verify the reachability, the liveness, the livelock-free property, and the deadlock-free property. As a result, we prove the protocol has the consistency. The specification and the validation are also effective to the OSPF Version 3 that inherit the protocol mechanism of the OSPF Version 2.
Keywords
Protocol Validation; OSPF Routing Protocol; Formal Method; Label Transition System;
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