5.4. Essential LSAs
This section and Section 5.5, covering TLVs, examine the nuts and bolts of the essential data entities used by OSPF and IS-IS. This kind of information is admittedly dry as toast, so whether you read these two sections in depth or just skim them depends on your tolerance for such details. However, at least a passing familiarity with the LSAs and TLVs is necessary if you want to understand OSPF and IS-IS.
By “essential LSAs,” I mean the five LSAs necessary for basic OSPF operation. If you are running traffic engineering, a not-so-stubby area, or a number of other extended features, other LSAs are essential to your network as well. They are introduced in the succeeding chapters covering the extensions they support.
The five ...
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