Avaya Configuring ATM and MPLS Services Manuel d'utilisateur Page 43

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Understanding ATM, MPOA, ATM Router Redundancy, and OAM
117374-C Rev 00
1-13
You can choose from four data encapsulation types:
LANE
LLC/SNAP
NULL
NLPID
How you assign a data encapsulation type and which type takes precedence
depends on the virtual circuit type and, for PVCs, the order in which you assign
the encapsulation type.
Each ATM device must encapsulate PDUs before sending them to the SAR
sublayer.
LANE Encapsulation
LANE provides Ethernet (IEEE 802.3) or token ring (IEEE 802.5) encapsulation
of ATM PDUs for transmission over an emulated LAN. You can assign LANE
encapsulation to SVCs only.
LLC/SNAP Encapsulation
Logical Link Control/Subnetwork Access Protocol (LLC/SNAP; RFC 1483)
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
Note:
Assigning LLC/SNAP to an SVC service record automatically uses the
technology defined in RFC 1577, Classical IP and ARP over ATM. For
information about RFC 1577, see “Classical IP over ATM Concepts
” on
page 1-28
.
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