Ccna 4 v3 0 module 5 frame relay
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CCNA 4 v3.0 Module 5 Frame Relay. Objectives. Frame Relay concepts Configuring Frame Relay. Frame Relay Operation. Frame Relay Switches. Frame Relay Concepts. Local Significance of DLCIs.

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  • Frame Relay concepts

  • Configuring Frame Relay

Local significance of dlcis
Local Significance of DLCIs

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


  • 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).

Bandwidth and flow control
Bandwidth and Flow Control

Bit counter Example 1

Full mesh topology
Full-Mesh Topology

Ccna 4 v3 0 module 5 frame relay

  • 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

Reachability issues with routing updates in nbma
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.

Verifying frame relay
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

The show frame relay lmi command
The show frame-relay lmi Command

The show frame relay pvc command
The show frame-relay pvc Command

The show frame relay map command
The show frame-relay map Command

Troubleshooting frame relay
Troubleshooting Frame Relay

  • Use the debug frame-relay lmi command to determine whether the router and the Frame Relay switch are sending and receiving LMI packets properly.