OSI/TS Configuration and Management Manual

Background Information About Addressing
OSI/TS Configuration and Management Manual—424831-001
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Network Addressing Domains
domain and, in turn, regulated by its parent authority (which in turn, may be regulated
by its parent authority, and so on).
Each addressing authority is independent of other addressing authorities on the same
hierarchical level. The highest addressing authority is the one that governs the global
network addressing domain. This authority is defined in ISO 8348, Addendum 2.
Network Addressing Domains
The set of rules that makes up a network addressing authority has jurisdiction over a
portion of the network, known as a network addressing domain. Each network
addressing domain is governed by a single network addressing authority. Every NSAP
address, therefore, is within a network addressing domain. Each network addressing
domain is, in turn, within a hierarchically higher network addressing domain, which is
again within a higher domain, and so on. The highest domain is the global network
addressing domain, which encompasses all NSAP addresses in an OSI network. A
network may include many or few addressing domains.
Figure 2-1
shows an example network and some possible addressing domains within
that network. This example shows the global network addressing domain, four
subdomains, and a subsubdomain.