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Configuring OSI Services

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303535-A Rev 00

OSI Basic Reference Model

OSI is a nonproprietary distributed processing architecture. The International

Organization for Standardization (ISO) developed OSI to provide communication

standards. These standards allow computer systems from different vendors to

communicate.

The OSI basic reference model combines a structured computer system

architecture with a set of common communication protocols. It comprises seven

layers. Each layer provides specific functions or services and follows the

corresponding OSI communication protocols to perform those services.

OSI is an “open system” architecture. Peer-to-peer common layers between

systems abolish the vendor-specific restrictions imposed by other architectures.

The principles of the OSI layering scheme include the following:

• Similar services are on the same layer.

• Services provided by lower layers are transparent to the layers above it.

• The lower the layer, the more basic the services it provides.

• The higher layers build upon the services offered by the layers below them.

OSI services for Bay Networks Version 7.60 and later software are United States

Government OSI Protocol (GOSIP) Version 2.0 compliant. In addition, Bay

Networks router software provides support for the first three layers of the ISO/

CCITT (now ITU-T) recommended set of standards for international open

systems support and vendor interoperability. These layers are physical, data link,

and network.

Table 1-1

lists some of the most common ISO standards implemented by OSI.

1 2 ... 15 16 17 18 19 20 21 22 23 24 25 ... 137 138

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