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Dial Services Overview

117353-B Rev. 00

1-9

In Figure 1-4, remote Routers A, B, and C are connecting to the central Router D

through a frame relay network, dialing into the network across ISDN lines. Router

D connects to the network across a leased line.

The permanent virtual circuits (PVCs) in this network can be either fully meshed

or non-fully meshed, allowing Routers A, B, C, and D to connect to one another.

With the dial connection between the routers and the frame relay network, each

router can dial into the network and communicate with one another, provided that

the PVCs are set up properly and the physical and logical connections are active.

Configuring Frame Relay to Work Optimally with Dial-on-Demand

How frame relay demand circuits operate depends on how your frame relay

service provider defines the user network interface (UNI), the point between the

router and the service provider. The service provider defines the UNI dynamically

or statically.

If the UNI is dynamic, it changes for each call. This means that the PVCs may be

different for each call, but they direct data to the same destination. The router

initially learns the PVCs when it calls the frame relay switch. If the UNI is static,

the user has defined the PVCs and can configure them for the router. The UNI

remains the same for all calls.

For a frame relay demand configuration to work well, follow these guidelines:

• You must have a PVC configured before you place a call.

For data to activate a demand circuit (instead of using Force Dial), the router

must learn at least one PVC from the frame relay switch before it can place a

call. However, to learn the PVCs, the router must call the switch, which it

cannot do.

For a dynamic UNI, you need to statically configure at least one PVC on the

router that is not configured for the switch. The static PVC acts as a “fake”

PVC that the router uses only to place an initial call to the switch. To

configure a static PVC, you set the frame relay Data Link Connection

Identifier (DLCI) to a number other than the number the switch provider

assigns, assuming you know the range of possible DLCIs. The static PVC is

still valid if you happen to use a number that the switch provider uses. For

information about configuring PVCs, see Configuring Frame Relay Services.

For a static UNI, the user configures the PVCs. A “fake” PVC is unnecessary.

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Avaya Configuring Dial Services Manual de usuario Pagina 37