Avaya Configuring ATM Services Bedienungsanleitung PDF herunterladen (Seite 45)

ATM DXI Features and Implementation Notes

2-9

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.

Direct access mode is best suited to small, nonmeshed conﬁgurations, or to

conﬁgurations in which protocols must reside on separate PVCs.

Hybrid Access Mode

Hybrid access mode combines characteristics of group and direct access modes. It

works best for nonmeshed network conﬁgurations that use both bridging and

routing over a single ATM DXI interface. This mode is also best for spanning tree

bridging.

Note: Be aware that the maximum number of PVCs you can conﬁgure in

direct access mode varies, depending on the conﬁguration of the router, the

number of protocols running on the circuits, and the number of routing entries.

SITE A

SITE B

SITE C

SITE D

PVC

Upper-layer

Protocol

ATM

Network

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Avaya Configuring ATM Services Bedienungsanleitung Seite 45