Addressing with IS-IS
In IS-IS, each network node is identified by its NSAP address. This addressing scheme provides multilevel, hierarchical address assignments. These addresses provide the flexibility to answer two critical questions:
How do you administer a worldwide address space?
How do you assign addresses in a manner that makes routing feasible in a worldwide Internet?
An NSAP address consists of two parts: the initial domain part and the domain-specific part. For administrative purposes, the ISO addresses are also subdivided into the Initial Domain Part (IDP) and the Domain-Specific Part (DSP). IDP is standardized by ISO, and specifies the format and the authority responsible for assigning the rest of the address. The DSP is assigned ...
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