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Cisco ONS 15600 Reference Manual, R7.2
Chapter 9 Management Network Connectivity
9.7.3 OSI Connectionless Network Service
CLNP uses network service access points (NSAPs) to identify network devices. The CLNP source and
destination addresses are NSAPs. In addition, CLNP uses a network element title (NET) to identify a
network-entity in an end system (ES) or intermediate system (IS). NETs are allocated from the same
name space as NSAP addresses. Whether an address is an NSAP address or a NET depends on the
network selector value in the NSAP.
The ONS 15600 supports the ISO Data Country Code (ISO-DCC) NSAP address format as specified in
ISO 8348. The NSAP address is divided into an initial domain part (IDP) and a domain-specific part
(DSP). NSAP fields are shown in Table 9-9. NSAP field values are in hexadecimal format. All NSAPs
are editable. Shorter NSAPs can be used. However NSAPs for all NEs residing within the same OSI
network area usually have the same NSAP format.
Table 9-9 NSAP Fields
Field Definition Description
IDP
AFI Authority and
format identifier
Specifies the NSAP address format. The initial value is 39 for the
ISO-DCC address format.
IDI Initial domain
identifier
Specifies the country code. The initial value is 840F, the United States
country code padded with an F.
DSP
DFI DSP format
identifier
Specifies the DSP format. The initial value is 80, indicating the DSP
format follows American National Standards Institute (ANSI)
standards.
ORG Organization Organization identifier. The initial value is 000000.
Reserved Reserved Reserved NSAP field. The Reserved field is normally all zeros (0000).
RD Routing domain Defines the routing domain. The initial value is 0000.
AREA Area Identifies the OSI routing area to which the node belongs. The initial
value is 0000.