Avaya Configuring ATM DXI Services Manual de usuario descargar pdf (Pagina 36)

Configuring ATM DXI Services

2-12 117375-A Rev. A

For hybrid access mode, you must conﬁgure all PVCs manually and assign

bridging protocols to run on each PVC. Hybrid access supports all protocols that

are available for the ATM interface: IP, IPX, XNS, DECnet Phase IV, AppleTalk,

VINES, and bridging.

Before you conﬁgure hybrid access on your router, carefully evaluate the types of

routers you are connecting in your network. For example, combining Series 7

routers running in group access bridge mode with Series 7 (or later) routers

running in hybrid access mode may cause broadcasting or spanning tree problems.

If you plan to conﬁgure such a network, contact the Bay Networks Technical

Solutions Center.

Using Hybrid Access for Transparent Bridging

In Figure 2-7, trafﬁc bridges between Sites A and B. The bridge (Router 1) runs on

an ATM DXI interface and its conﬁguration deﬁnes the PVCs as group access

mode. In the ﬁgure:

1. The bridge receives data from Site A.

2. If the bridge does not recognize the destination address, it tries to direct trafﬁc

through another bridge port.

3. With the PVCs in group access mode, the ATM bridge port views the paths to

Site A and Site B as the same.

4. Because the bridge does not send out data on the same bridge port from which

it just received it, the bridge does not direct the data to Site B.

5. As a result, in this example, you need to use hybrid access mode.

Note: When you select hybrid access mode for a PVC, Site Manager provides

only three protocol options: Bridge, Spanning Tree, and Native Mode LAN

(NML). These protocols, as well as the protocols that are on the ATM

interface, can run on the PVC.

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Avaya Configuring ATM DXI Services Manual de usuario Pagina 36