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CCNA 4 v3.1 Module 5 Frame Relay

CCNA 4 v3.1 Module 5 Frame Relay. Objectives. Frame Relay Operation. Frame Relay Switches. Frame Relay Concepts. Virtual Circuits. Local Significance of DLCIs. The data - link connection identifier (DLCI) is stored in the Address field of every frame transmitted. Terminology.

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CCNA 4 v3.1 Module 5 Frame Relay

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  1. CCNA 4 v3.1 Module 5 Frame Relay

  2. Objectives

  3. Frame Relay Operation

  4. Frame Relay Switches

  5. Frame Relay Concepts

  6. Virtual Circuits

  7. Local Significance of DLCIs The data-link connection identifier (DLCI) is stored in the Address field of every frame transmitted.

  8. Terminology • The connection through the Frame Relay network between two DTEs is called a virtual circuit (VC). • Virtual circuits may be established dynamically by sending signaling messages to the network. In this case they are called switched virtual circuits (SVCs). • Virtual circuits can be configured manually through the network. In this case they are called permanent virtual circuits (PVCs).

  9. Frame Relay Stack Layered Support

  10. Frame Relay Functions

  11. Bandwidth and Flow Control Bit counter Example 1

  12. Frame Relay Concepts Queue

  13. Frame Relay Concepts

  14. Frame Relay Concepts

  15. Selecting a Frame Relay Topology Full Mesh Partial Mesh Star (Hub and Spoke)

  16. LAPF Frame – Address Field 6-bits 4-bits

  17. Data Link Control Identifier • The 10-bit DLCI associates the frame with its virtual circuit • It is of local significance only - a frame will not generally be delivered with the same DLCI with which it started • Some DLCI’s are reserved

  18. Local Management Interface (LMI) • Three types of LMIs are supported by Cisco routers: • Cisco — The original LMI extensions • Ansi — Corresponding to the ANSI standard T1.617 Annex D • q933a — Corresponding to the ITU standard Q933 Annex A

  19. LMI Frame Format 1 2 1 1 1 1 2 1 Flag Address Control PD CR MT LMI Message FCS Flag

  20. Stages of Inverse ARP andLMI Operation #1

  21. Stages of Inverse ARP and LMI Operation #2

  22. Configuring Basic Frame Relay

  23. Configuring a Static Frame Relay Map

  24. Reachability Issues with Routing Updates in NBMA

  25. Reachability Issues with Routing Updates in NBMA By default, a Frame Relay network provides nonbroadcast multiaccess (NBMA) connectivity between remote sites. An NBMA environment is treated like other multiaccess media environments, where all the routers are on the same subnet.

  26. Frame Relay Subinterfaces

  27. Configuring Point-to-Point Subinterfaces

  28. Verifying Frame Relay • The show interfaces command displays information regarding the encapsulation and Layer 1 and Layer 2 status. It also displays information about the following: • The LMI type • The LMI DLCI • The Frame Relay data terminal equipment/data circuit-terminating equipment (DTE/DCE) type

  29. The show interface Command LMI Status LMI DLCI LMI Type

  30. The show frame-relay lmi Command

  31. The show frame-relay pvc Command

  32. The show frame-relay map Command

  33. Troubleshooting Frame RelayThe debug frame-relay lmi Command PVC Status 0x2 – Active 0x0 – Inactive 0x4 – Deleted

  34. Summary

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