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CCNA 4 Chapter 15

Frame Relay

By

PRAVEENKUMAR P.J

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Objectives

Frame Relay concepts

Configuring Frame Relay

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Frame Relay Operation

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Frame Relay Concepts

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Frame Relay Switches

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DLCI

The data-link connection identifier (DLCI) isstored in the Address field of every frametransmitted.

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Terminology

The connection through the Frame Relaynetwork between two DTEs is called a virtual

circuit (VC). Virtual circuits may be established

dynamically by sending signaling messagesto the network. In this case they are called

switched virtual circuits (SVCs).

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Frame Relay Stack

Layered Support

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Frame Relay Functions

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Bandwidth and Flow Control

Bit counterExample 1

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Concepts

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LAPF Frame

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Full-Mesh Topology

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Frame Relay Mesh

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LMI

Cisco The original LMI extensions

Ansi Corresponding to the ANSI standard

T1.617 Annex D q933a Corresponding to the ITU standard

Q933 Annex A

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Stage 1 of Inverse ARP and

LMI Operation

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Stage 2 of Inverse ARP and

LMI Operation

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Configuring Frame Relay

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Configuring Basic Frame Relay

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Configuring a Static

Frame Relay Map

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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 othermultiaccess media environments, where all the routers are on the same subnet.

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Frame Relay Subinterfaces

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Configuring PPP Interfaces

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Verifying Frame Relay

The show interfaces command displays

information regarding the encapsulation and

Layer 1 and Layer 2 status. It also displaysinformation about the following:

The LMI type

The LMI DLCI

The Frame Relay data terminal equipment/datacircuit-terminating equipment (DTE/DCE) type

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The show frame-relay lmi

Command

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The show frame-relay pvc

Command

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The show frame-relay map

Command

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Troubleshooting Frame Relay

Use the debug frame-relay lmi

command to determine whether the router

and the Frame Relay switch are sending andreceiving LMI packets properly.