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Customizing ATM Interfaces and Service Records
114056 Rev. A 6-5
Defining a Service Record
A service record is generally defined by the type of data encapsulation and virtual
connection it uses. Table 6-1 shows the settings necessary to define a specific
service record.
Assigning the Data Encapsulation Type
ATM allows you to choose from four data encapsulation types: LANE,
LLC/SNAP, NLPID, and NULL. LANE is the default value when signaling is
enabled on the interface. LLC/SNAP is the default value when signaling is
disabled on the interface.
Each ATM device must encapsulate PDUs before sending them to the SAR
sublayer. As a general rule, you can assign
LLC/SNAP or NULL data encapsulation for service records containing PVCs
LLC/SNAP data encapsulation for service records containing hybrid PVCs
LANE encapsulation for service records containing SVCs over which you
want to run LAN emulation
LLC/SNAP or NULL for service records containing SVCs over which you
want to run classical IP (RFC 1577)
For additional information about assigning data encapsulation, refer to Chapter 2.
Table 6-1. Defining a Service Record
Service Record Data Encapsulation Type Virtual Connection Type
PVC LLC/SNAP, NLPID, or NULL PVC
Classical IP LLC/SNAP or NULL SVC
LANE LANE SVC
Note: If you select NULL, the router interprets this as virtual, channel-based
multiplexing, which is not supported for bridging.
Site Manager: Data Encapsulation Type: page A-20
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