Avaya Configuring Frame Relay Services Manual do Utilizador descarregar pdf (Página 38)

Configuring Frame Relay Services

1-16

308624-14.10 Rev 01

Direct Access Mode

Direct mode describes a service record with one PVC. In direct access mode,

upper-layer protocols treat the frame relay network as a series of point-to-point

connections. The upper-layer protocols view each PVC as an individual network

interface.

Service records in direct access mode:

• Limit broadcasts to one PVC.

• Enable multiple layer 3 networks per interface.

Hybrid Access Mode

Hybrid access mode, as its name implies, combines characteristics of group and

direct access modes. Frame relay hybrid mode enables you to use the same PVCs

for both routing and bridging. It works only for non-fully meshed network

configurations that use:

• Both bridging and routing over a single frame relay interface

• Spanning tree bridging

In a fully meshed network, PVCs exist between each pair of nodes in the network.

In a non-fully meshed network, PVCs exist only between nodes that need to

communicate. Figure 1-6

shows a non-fully meshed network using hybrid mode.

Figure 1-6. Hybrid Mode Configuration, Non-Fully Meshed Network

SITE A

Routing protocol sees

one interface to the network

Routing

protocol

Bridge

protocol

SITE B

Direction of data

Frame relay

network interface

Frame

relay

network

Hybrid PVC

I = Interface to network

Bridge protocol sees two interfaces

to the network

FR0007A

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Avaya Configuring Frame Relay Services Manual do Utilizador Página 38