frame relay from cisco

8/14/2019 Frame Relay From Cisco

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1 2004, Cisco Systems, Inc. All rights reserved.

CCNA 4 v3.1 Module 5

Frame Relay


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Purpose of This PowerPoint

This PowerPoint primarily consists of the TargetIndicators (TIs) of this module in CCNA version3.1.

It was created to give instructors a PowerPoint totake and modify as their own.

This PowerPoint is:NOT a study guide for the module final assessment.

NOT a study guide for the CCNA certification exam. Please report any mistakes you find in this

PowerPoint by using the Academy ConnectionHelp link.


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Objectives


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Frame Relay Operation


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Frame Relay Switches


7/36777 2004, Cisco Systems, Inc. All rights reserved.

Frame Relay Concepts



Virtual Circuits



Local Significance of DLCIs

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



Terminology

The connection through the Frame Relaynetwork between two DTEs is called a virtualcircuit (VC).

Virtual circuits may be established dynamicallyby sending signaling messages to the network.In this case they are called switched virtualcircuits (SVCs).

Virtual circuits can be configured manuallythrough the network. In this case they are calledpermanent virtual circuits (PVCs).



Frame Relay Stack Layered Support



Frame Relay Functions



Bandwidth and Flow Control

Bit counter Example 1




Queue



Star (Hub and Spoke)

Full Mesh

Partial Mesh

Selecting a Frame Relay Topology



LAPF Frame Address Field

6-bits

4-bits



Data Link Control Identifier

The 10-bit DLCI associates the frame with its virtualcircuit

It is of local significance only - a frame will notgenerally be delivered with the same DLCI with whichit started

Some DLCIs are reserved



Local Management Interface (LMI)

Three types of LMIs are supported by Ciscorouters:

Cisco The original LMI extensionsAnsi Corresponding to the ANSI standardT1.617 Annex D

q933a Corresponding to the ITU standardQ933 Annex A


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LMI Frame Format

LMI MessageFlag FlagFCS

1 2 1

Address

2 1

Control

1

PD

1

CR

1

MT


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Stages of Inverse ARP andLMI Operation #1


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Stages of Inverse ARP andLMI Operation #2


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Configuring Basic Frame Relay


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Reachability Issues with Routing Updatesin NBMA


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Reachability Issues with Routing Updatesin NBMA

By default, a Frame Relay network provides nonbroadcastmultiaccess (NBMA) connectivity between remote sites.An NBMA environment is treated like other multiaccessmedia environments, where all the routers are on thesame subnet.


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Frame Relay Subinterfaces


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Configuring Point-to-Point Subinterfaces


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Verifying Frame Relay

The show interfaces command displaysinformation regarding the encapsulationand Layer 1 and Layer 2 status. It also

displays information about the following:The LMI type

The LMI DLCI

The Frame Relay data terminalequipment/data circuit-terminatingequipment (DTE/DCE) type


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The show interface Command

LMI Type

LMI DLCI

LMI Status


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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 RelayThe debug frame-relay lmi Command

PVC Status0x2 Active0x0 Inactive0x4 Deleted


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Summary

frame relay from cisco

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