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Understanding ATM DXI Concepts

117375-A Rev. A 2-13

Figure 2-7. Example of a Bridged Network

If you deﬁne the PVCs to be in

hybrid access mode (refer to Figure 2-6), each

PVC acts as a bridge port. This enables the bridge running on the ATM interface

to view the trafﬁc from Site A as arriving on a different port than that of Site B.

When the bridge sends out data, it now has access to all of its ports, including the

port that accesses Site B. Therefore, data from Site A can reach Site B.

Using Hybrid Access for Routing

In hybrid access mode, routing protocols view the ATM network interface in terms

of group access PVCs, as described in the “Gr

oup Access Mode” section, earlier

in this chapter.

ATM DXI and Multipath Support

Our implementation of ATM DXI provides multipath redundancy. This means, for

example, that if there are two physical lines and one line fails, the other takes over

the task of transmission (redundancy). If both lines are working, the router uses

both lines simultaneously (multipath).

Router 1

Bridge port sees one

path to Sites A and B

Router 2

Router 3

Site A Site B

ATM

network

ATM0013A

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Avaya Configuring ATM DXI Services Manual de usuario Pagina 37