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Chapter Objectives

Chapter Objectives. After completing this chapter you will be able to: Define RFC 1483 Describe logical link control (LLC) encapsulation Describe VC multiplexing State when both methods are used. VPI/VCI. IP & IPX. VPI/VCI. VPI/VCI. IPX. IP. RFC 1483. pad (0 - 47 octets)

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Chapter Objectives

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  1. Chapter Objectives After completing this chapter you will be able to: • Define RFC 1483 • Describe logical link control (LLC) encapsulation • Describe VC multiplexing • State when both methods are used

  2. VPI/VCI IP & IPX VPI/VCI VPI/VCI IPX IP RFC 1483

  3. pad (0 - 47 octets) to fill cell payload Higher-layer PDU Network Layer Protocol Data Unit pad ctrl len CRC Length of pad Field (16 bits) AAL5 CRC (32 bits) Payload Payload 48 bytes AAL5 Frame Format

  4. SubNetwork Attachment Point (SNAP) header LLC OUI PID NON ISO PDU IP Packet 2^16 - 9 octets 3 octet LLC header 2 octet Protocol Identifier 3 octet Organisationally Unique Identifier LLC/SNAP Encapsulation for a Routed Non-ISO PDU

  5. VC based Multiplexing - Characteristics • Each protocol is carried over a separate virtual channel • No need for LLC/SNAP header • Less overhead and processing required

  6. VC-based multiplexing Private ATM networks where there is dynamic creation of large numbers of VCs Where a fast and economical method is required LLC Encapsulation Where the ATM network only supports PVCs Where charging depends on the number of simultaneous VCs Choice of Encapsulation Method RFC 1483 In reality VC-based multiplexing • LANEv1 LLC/SNAP Encapsulation • IP over ATM • MPOA

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