IS-IS Protocol Functions

The routing layer functions provided by the IS-IS protocol can be grouped into two main categories: subnetwork-dependent functions and subnetwork-independent functions. In IS-IS, subnetwork refers to the data-link layer. This notion fundamentally differs from IP terminology, in which a subnetwork refers to an IP address subnet. Only two types of IS-IS subnetworks are of practical significance in current applications of the IS-IS protocol: point-to-point and broadcast links.

The subnetwork-dependent functions relate to capabilities for interfacing with the data-link layer and primarily involve operations for detecting, forming, and maintaining routing adjacencies with neighboring routers over various types of interconnecting ...

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