
Configuring ATM Services
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Setting a VCI Number
The VCI number does not have a default setting. You must enter a valid VCI
number for each PVC you create. This number identifies the virtual channel of the
PVC. The VCI is part of the cell header. The header can contain a maximum of 16
VCI bits. This bit range allows for channel identifiers from 0 through 65535.
Designating a VC as Hybrid/Bridged
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.
By default, a PVC does not operate as a hybrid/bridged VC. However, you can
configure any PVC to operate as a hybrid/bridge VC.
For more information on PVC access methods, including hybrid access, refer to
“PVC Access Methods” in Chapter 2.
Site Manager: VCI Number: page A-26
Note: Following the recommendation of the ATM Forum, virtual channel
identifiers from 0 through 31 are reserved for signaling and added
functionality.
Note: When you define a PVC as a hybrid/bridged VC, you can also configure
additional Bridge, Spanning Tree, and NML protocol options. These protocols
run on the PVC along with any protocols you defined in the ATM service
record.
Site Manager: Hybrid/Bridged VC: page A-26
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