
Understanding ATM DXI Concepts
117375-A Rev. A 2-11
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.
If your network combines bridging and routing over the same interface, you not
only need PVCs in group access mode for routing, but you also need bridging to
operate over these same PVCs. Since group access mode does not allow for
bridging in nonmeshed environments, you must use hybrid access mode. In this
mode, a PVC behaves like a direct access PVC for bridging while maintaining
group access characteristics for routing protocols (Figure 2-6).
Figure 2-6. Hybrid Access Mode
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
Bridge protocol sees two interfaces
to the network
I
I = Interface
Routing
protocol
Bridge
protocol
SITE B
Direction of data
ATM
network interface
Hybrid PVC
Hybrid PVC
Routing protocol sees
one interface to the network
ATM
Network
I
I
ATM0012A
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