3.1. Comparative Terminology
This first section has nothing to do with messages, but it has to go somewhere. So here you are. OSPF is a child of the IETF, whereas IS-IS is born of the ISO, and they frequently use different terms to describe the same things. So before getting into messages, I want to spend a short time listing these redundant terms.
The most obvious terminology difference is between the IETF term router (or, that relic of earlier times, gateway) and the ISO term intermediate system (IS). Similarly, an IETF host is in ISO terms an end system (ES), and ES-IS is a protocol spoken between end systems and intermediate systems (hosts and routers). ES-IS is only used for CLNP, never for IP, so it is not mentioned again in this book. ...
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