Avaya Configuring ATM Services Manual de usuario Pagina 138

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Configuring ATM Services
7-18
Assigning Data Encapsulation
ATM allows you to choose from three data encapsulation types: LLC/SNAP,
LANE 802.3, and NULL. How you assign a data encapsulation type and which
data encapsulation type takes precedence depend on the virtual circuit type and,
for PVCs, the order in which you assign the encapsulation type.
Encapsulation Methods
Each ATM device must encapsulate PDUs in an ATM cell before it can send them
over the ATM network.
LLC/SNAP Encapsulation
This method allows multiplexing of multiple protocols over a single ATM virtual
circuit. In this approach, an IEEE 802.2 Logical Link Control (LLC) header
prefixes each PDU. You can assign LLC/SNAP encapsulation to
PVC service records
SVC service records
Individual PVCs
NULL Encapsulation
RFC 1483 refers to this method as “VC-based multiplexing.” This method
performs higher-layer protocol multiplexing implicitly using ATM virtual circuits.
You can assign NULL encapsulation to
PVC service records
SVC service records
Individual PVCs
Note: Assigning LLC/SNAP to an SVC service record automatically invokes
the technology defined in RFC 1577, “Classical IP and ARP over ATM.”
Note: Assigning NULL to an SVC service record automatically invokes the
technology defined in RFC 1577, “Classical IP and ARP Over ATM.”
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