
Configuring ATM and MPLS Services
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Encapsulation Rules for PVCs
How you assign data encapsulation to individual PVCs depends to a degree on the
data encapsulation type you assigned to the service record that contains those
PVCs. Table 1-4
provides suggestions for assigning data encapsulation to PVCs
and hybrid PVCs that reside on these service records.
When assigning a data encapsulation type to a PVC or group of PVCs, keep the
following in mind:
• When you add a PVC, it reads and uses the data encapsulation type specified
in its ATM service record.
• You can globally assign a data encapsulation type to all nonhybrid PVCs in a
particular service record, or you can assign a data encapsulation type to
individual group PVCs.
• If you change the data encapsulation value for the service record, all new
PVCs that you add to that service record use the new value.
• You must assign a data encapsulation type to hybrid-mode PVCs individually.
You cannot assign data encapsulation to a hybrid-mode PVC using the service
record.
• When you use the copy function, the new PVC uses the data encapsulation
type of the existing PVC.
• When running IP over a NULL encapsulated PVC service record, you must
change the Address Resolution parameter to None. You must then add an IP
adjacent host with the MAC address equal to the VPI/VCI of the PVC. See
Configuring IP Services for information about the Address Resolution
parameter.
Table 1-4. Assigning Data Encapsulation to Individual PVCs
Service Record Data
Encapsulation Type
Individual PVC Data
Encapsulation Type
Hybrid PVC Data
Encapsulation Type
LLC/SNAP NULL or LLC/SNAP LLC/SNAP
NULL NULL or LLC/SNAP LLC/SNAP
NLPID NLPID NLPID
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