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Configuring OSI Services

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303535-A Rev 00

• Intermediate systems originate and receive data, as well as forward (route)

data. The Bay Networks OSI router is an intermediate system.

End systems and intermediate systems are divided administratively into separate

routing areas. A collection of areas that are under the control of a single

administration and operate common routing protocols is a routing domain.

A network manager defines the boundaries of routing domains. An entire group of

routing domains that are under one administrative authority (for example, a

company or a university) is an administrative domain (Figure 1-1).

Figure 1-1. OSI Network Organization

Level 1 and Level 2 Routing

In an OSI network, the router runs Connectionless-mode Network Service

(CLNS) and transfers data in a connectionless (packet) format using the

Connectionless Network Protocol (CLNP). The router routes data through the

network, using:

• Level 1 (L1) routing for routing data within an area

• Level 2 (L2) routing for routing data between areas

Administrative Domain

Routing Domain

Area

End Systems

and

Routers

OSI0002A

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