
Configuring ATM Services
5-10
Hybrid Access
PVCs do not typically allow for bridging in nonmeshed environments. If your
network combines bridging and routing over the same interface, you need to use
the service record portion of each PVC for routing, while at the same time allow
bridging to operate. To do this, you must define the PVC as a hybrid/bridged VC.
Defining the PVC as a hybrid/bridged VC allows the bridge to view each PVC as
a separate bridge interface while allowing the routing protocols to view all PVCs
as part of the same interface (Figure 5-5).
Use hybrid PVCs when creating nonmeshed network configurations that use both
bridging and routing over a single ATM interface. These PVCs work best for
spanning tree bridging.
Figure 5-5. Hybrid PVCs
Note: When you define a PVC as a hybrid/bridged VC, Site Manager provides
additional Bridge, Spanning Tree, and Native Mode LAN (NML) protocol
options. These protocols run on the PVC along with the protocols defined in
the ATM service record.
Site A
Routing protocol sees
one interface to the network
Bridge protocol sees two interfaces
to the network
I
I
= Interface to Network
Routing
Protocol
Bridge
Protocol
I
I
Site B
Hybrid PVC
Hybrid PVC
Direction of Data
ATM
Network
ATM
Network Interface
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