AIS Router AI2524 Manuel d'utilisateur télécharger pdf (Page 160)

100

101

AI2524 Router Card User’s Manual

Page 9-2 August 1997

2524UM

Understand

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.

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).

An NSAP address consists of these two major fields, as shown in Fig-

ure 9-1:

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.

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).

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

Figure 9-2. Determine which routers are to be assigned to which areas.

1 2 ... 155 156 157 158 159 160 161 162 163 164 165 ... 417 418

Commentaires sur ces manuels

Pas de commentaire

AIS Router AI2524 Manuel d'utilisateur Page 160

Commentaires sur ces manuels