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VRRP: Increasing Reliability and Failover with the Virtual Router Redundance Protocol by Adnan Adam Onart, Ayikudy Srikanth

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4.1. VRRP State Machine

A good way of explaining a protocol is to describe it as a state machine. The state machine provides not only a basis for a clear understanding of the protocol but also a sound foundation for its implementation. We start our discussion of the VRRP state machine by examining the elements needed for its operations.

4.1.1. VRRP State Machine Elements

In order to describe the behavior of the VRRP state machine—the input and output events, the states as well as the functions used to decide on the transitions and to generate the required outputs—we need to describe a series of parameters involved in all these aspects of the state machine. Some of the parameters were discussed informally in Chapter 2 in the overview of the protocol ...

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