AIS AI2524 Manuel D’Utilisation
AI2524 Router Card User’s Manual
Page 9-2
August 1997
2524UM
Understand
Addresses
Addresses
Addresses in the ISO network architecture are referred to as NSAP ad-
dresses and network entity titles (NETs). Each node in an OSI network
has one or more NETs. In addition, each node has many NSAP ad-
dresses. Each NSAP address differs from one of the NETs for that
node in only the last byte. This byte is called the N-selector. Its func-
tion is similar to the port number in other protocol suites.
dresses and network entity titles (NETs). Each node in an OSI network
has one or more NETs. In addition, each node has many NSAP ad-
dresses. Each NSAP address differs from one of the NETs for that
node in only the last byte. This byte is called the N-selector. Its func-
tion is similar to the port number in other protocol suites.
The AI2524 router supports all NSAP address formats that are defined
by ISO 8348/Ad2; however, the AI2524 router provides ISO IGRP o
IS-IS dynamic routing only for NSAP addresses that conform to the
address constraints defined in the ISO standard for IS-IS (ISO 10589).
by ISO 8348/Ad2; however, the AI2524 router provides ISO IGRP o
IS-IS dynamic routing only for NSAP addresses that conform to the
address constraints defined in the ISO standard for IS-IS (ISO 10589).
:
z
The initial domain p art (IDP) is made up of 1-byte authority and
format identifier (AFI) and a variable-length initial
domai nidentifier (IDI). The length of the IDI and the encoding
format for the domai nspecific part (DSP) are based on the value
of the AFI.
format identifier (AFI) and a variable-length initial
domai nidentifier (IDI). The length of the IDI and the encoding
format for the domai nspecific part (DSP) are based on the value
of the AFI.
z
The DSP is made up of a high-order DSP, an area identifier, a sys-
tem identifier, and a 1-byte N-selector (labeled S).
tem identifier, and a 1-byte N-selector (labeled S).
Figure 9-1:NSAP Address Fields
Assign addresses or NETs for your domains and areas. Th
domai naddress uniquely identifies the routing domain. All routers
within a given doma inare given the same dom ainaddress. Within
each routing domain, you can set up one or more areas, as shown in
domai naddress uniquely identifies the routing domain. All routers
within a given doma inare given the same dom ainaddress. Within
each routing domain, you can set up one or more areas, as shown in
. Determine which routers are to be assigned to which areas.