Avaya Configuring ATM DXI Services Uživatelský manuál stáhnout pdf (Strana 34)

Configuring ATM DXI Services

2-10 117375-A Rev. A

In a bridged environment, use group access only for fully meshed conﬁgurations,

or in hub/spoke environments in which the spokes need not communicate. In a

nonbridged environment, you can use group access in any conﬁguration that does

not require protocols residing on separate PVCs (that is, where all PVCs accept

the same protocols).

Group access works best in either fully meshed environments or in nonmeshed

environments where systems not directly connected to each other have no need to

communicate. There are, however, ways to conﬁgure upper-layer protocols, like

IP or IPX, to allow systems in nonmeshed networks to fully communicate. Refer

to the appropriate upper-layer protocol documentation for more information.

Direct Access Mode

In direct access mode, upper-layer protocols treat the ATM network as a series of

point-to-point connections (Figure 2-5). The upper-layer protocols view each

PVC as an individual network interface. You can, therefore, conﬁgure each direct

mode PVC individually. This is helpful if you have different network sites using

different types of data encapsulation.

Figure 2-5. Direct Access Mode

Direct access supports the following protocols: IP, IPX, XNS, DECnet Phase IV,

AppleTalk, VINES, and bridging. If you use direct access mode, you must

conﬁgure each PVC manually and assign protocols to run on each PVC. This

mode allows you to dedicate a PVC to a particular protocol, but at the expense of

some conﬁguration overhead, memory, and address space.

PVC

Upper layer

protocol

Site A

Site B

Site C

Site D

ATM

network

ATM0011A

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Avaya Configuring ATM DXI Services Uživatelský manuál Strana 34