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Configuring ATM and MPLS Services
1-16
117374-C Rev 00
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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