
Configuring ATM Services
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308612-14.00 Rev 00
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
• WAN SVC service records
• Individual PVCs
NULL Encapsulation
RFC 1483 refers to NULL encapsulation as “VC-based multiplexing.” This
method performs upper-layer protocol multiplexing implicitly using ATM virtual
circuits. You can assign NULL encapsulation to:
• PVC service records
• SVC service records
• Individual PVCs that are also members of an LLC/SNAP service record
NLPID Encapsulation
You can use Network Layer Protocol ID (NLPID; RFC 1490) in an ATM
environment for frame relay/ATM internetworking. You can assign NLPID
encapsulation to PVC service records.
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
.
Note:
Assigning NULL 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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