Summary
This chapter covers one of the key underlying concepts of the IS-IS routing protocol: the IS-IS Link-State database. First, the functional organization of the IS-IS Link-State database is discussed. In support of the two-level routing hierarchy, each router supports a Level 1 and a Level 2 database for Level 1 and Level 2 routing, respectively. Subsequent discussions in the chapter focus on elements stored in the database (LSPs) and the associated control processes and elements that help in building and maintenance of the distributed Link-State database. Sequence number packets (CSNP and PSNP) and various timers used in related control processes ensure the integrity and consistency of the LSPs stored in the Level 1 and Level 2 Link-State ...
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