Using IS-IS as an IGP

Over the past few years, IS-IS has become increasingly more popular for use as an IGP. Previously, IS-IS was more prevalent in government and academic networks, the majority of which were pure CLNS environments that did not carry IP prefix information.

The IS-IS protocol seems to be widely perceived as difficult to understand and to configure. One of probable reasons for this is the additional requirement for CLNP (or NSAP) addresses. The node-based NSAP addresses differ vastly from IP addresses (see Chapter 4, “Addressing in Integrated IS-IS”) and require familiarity to work with comfortably. However, the comparable routing protocol, such as the Open Shortest Path First (OSPF) Protocol, works with only IP addresses. Even ...

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