Avaya Configuring Frame Relay Services Uživatelský manuál stáhnout pdf (Strana 29)

Implementation Notes

2-5

Hybrid Access

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

direct access modes. It works only for non-fully meshed network conﬁgurations

that use both bridging and routing over a single Frame Relay interface. This mode

is also best for spanning tree bridging.

If your network combines bridging and routing over a single interface, you need to

use PVCs in group access mode for routing while simultaneously using the same

PVCs for bridging. Since group access mode does not allow for bridging in non-

fully meshed environments, you need to use hybrid access mode.

This mode allows a PVC to function as a direct access PVC for bridging while

maintaining group access characteristics for routing protocols (Figure 2-4). You

must manually conﬁgure any PVC that requires hybrid access mode.

A hybrid access PVC uses group access for routing; therefore, all the routing

protocols you select for the Frame Relay interface are available for the hybrid

PVC. For bridging, the hybrid access circuit is separate from the other interface

circuits, so it supports only bridging, spanning tree, source routing, and native

mode LAN.

Figure 2-4. Hybrid Access Mode Conﬁguration

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 Uživatelský manuál Strana 29