OSI/TS Configuration and Management Manual

Background Information About Addressing
OSI/TS Configuration and Management Manual—424831-001
2-8
AFI Component
The parts of an NSAP address are as follows:
These fields are discussed in more detail in the following subsections.
AFI Component
The AFI (authority and format identifier) contains information about the network
addressing authority that regulates the domain specified in the IDP, as well as
information about the format of the IDI and the DSP. The network addressing authority
specifies the meaning of each AFI value
network addressing domains use the AFI values.
The AFI contains a two-digit number (ranging from 00 through 99) that specifies the
following information:
•
Network addressing authority responsible for regulating IDI values
•
Syntax type of the DSP
Figure 2-3. NSAP Address Components
IDP The IDP (initial domain part) unambiguously identifies a subdomain at
the highest level. This field is always expressed as a range of 2 through
17 decimal digits.
AFI The AFI (authority and format identifier) contains information
about the network addressing authority that regulates the domain
specified in the IDP, and information about the format of the IDI
and the DSP.
IDI The IDI (initial domain identifier) contains information about the
domain governed by the network addressing authority specified
in the AFI.
DSP The DSP (domain specific part) is the last component of the NSAP
address. The contents are determined by the information contained in
the AFI and IDI, and are regulated by the network addressing authority
associated with the subdomain identified in the IDP.
203CDT .CDD
IDP
(Decimal Digits)
DSP
(Encoded Syntax)
NSAP Address
AFI IDI