The IS-IS State Machine
The IS-IS state machine is responsible for the flow of information in the IS-IS architecture. The state machine is comprised of four processes: receive, update, decision, and forward. IS-IS also includes a Routing Information Base (RIB), which is composed of two databases, the link-state database and the forwarding database, and is essentially the routing table.
The receive process is responsible for receiving the LSAs and passing them onto the other three processes.
The following sections describe each process in more detail.
The Receive Process
The state machine is located at the input of the receive process. This process is the entry point for all datagrams including user data, error reports, and routing and control ...
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