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OSI Implementation Notes

303535-A Rev 00

2-9

Frame Relay Circuit Modes

The Bay Networks implementation of OSI over frame relay operates as a

subnetwork in either of these two types of Intermediate System to Intermediate

System (IS-IS) operation modes:

• Point-to-Point

• Broadcast

The OSI router implements these IS-IS operation modes over frame relay circuits.

Table 2-1

lists the frame relay modes used for IS-IS operations.

Direct Access

In direct access mode, OSI treats a PVC as a point-to-point connection. OSI views

each PVC as an individual network interface. In direct access mode, you configure

each frame relay PVC manually and configure the OSI protocol to run over it.

Figure 2-6

shows direct access mode with each PVC configured as a separate OSI

interface.

See Configuring Frame Relay Services for information about configuring PVCs.

Figure 2-6. Frame Relay Direct Access Mode

Table 2-1. Frame Relay Modes Used for OSI IS-IS Operations

Frame Relay Mode IS-IS Operation Mode

Direct access Point-to-Point

Group access Broadcast

Hybrid Broadcast

Frame Relay Network

Interface 1 = PVC 1

Interface 2 = PVC 2

PVC 1

PVC 2

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Avaya Configuring OSI Services Bedienungsanleitung Seite 61