1© 2003, Cisco Systems, Inc. All rights reserved.

CCNA 4 v3.0 Module 4ISDN and DDR

222© 2003, Cisco Systems, Inc. All rights reserved.

Objectives

• ISDN concepts

• ISDN configuration

• DDR configuration

333© 2003, Cisco Systems, Inc. All rights reserved.

Digital Communication with ISDN

444© 2003, Cisco Systems, Inc. All rights reserved.

ISDN Benefits

555© 2003, Cisco Systems, Inc. All rights reserved.

ISDN Standards

666© 2003, Cisco Systems, Inc. All rights reserved.

ISDN Access Options

777© 2003, Cisco Systems, Inc. All rights reserved.

ISDN 3-Layer Model

888© 2003, Cisco Systems, Inc. All rights reserved.

Q.931 Messaging-Call Setup Example

999© 2003, Cisco Systems, Inc. All rights reserved.

Call Processing

1. The D channel is used to send the called number to the local ISDN switch.

2. The local switch uses the SS7 signaling protocol to set up a path and pass the called number to the remote ISDN switch.

3. The remote ISDN switch signals the destination over the D channel.

4. The destination ISDN NT-1 device sends the remote ISDN switch a call-connect message.

5. The remote ISDN switch uses SS7 to send a call-connect message to the local switch.

6. The local ISDN switch connects one B channel end-to-end, leaving the other B channel available for a new conversation or data transfer. Both B channels can be used simultaneously.

101010© 2003, Cisco Systems, Inc. All rights reserved.

ISDN Functions and Reference Points

111111© 2003, Cisco Systems, Inc. All rights reserved.

ISDN Functions and Reference Points

121212© 2003, Cisco Systems, Inc. All rights reserved.

BRI Reference Points

131313© 2003, Cisco Systems, Inc. All rights reserved.

Cisco ISDN BRI Interfaces

141414© 2003, Cisco Systems, Inc. All rights reserved.

ISDN Interfaces

S/T ISDN Interface

U ISDN Interface

151515© 2003, Cisco Systems, Inc. All rights reserved.

ISDN Switch Types

161616© 2003, Cisco Systems, Inc. All rights reserved.

Configuring ISDN BRI

171717© 2003, Cisco Systems, Inc. All rights reserved.

Configuring ISDN BRI

181818© 2003, Cisco Systems, Inc. All rights reserved.

Configuring ISDN PRI

191919© 2003, Cisco Systems, Inc. All rights reserved.

Switch Types Available for ISDN PRI Configuration

202020© 2003, Cisco Systems, Inc. All rights reserved.

ISDN PRI Examples

212121© 2003, Cisco Systems, Inc. All rights reserved.

Verifying ISDN Configuration

222222© 2003, Cisco Systems, Inc. All rights reserved.

Troubleshooting ISDN Configuration

232323© 2003, Cisco Systems, Inc. All rights reserved.

DDR Operation

242424© 2003, Cisco Systems, Inc. All rights reserved.

DDR Operation

252525© 2003, Cisco Systems, Inc. All rights reserved.

Configuring Legacy DDR

262626© 2003, Cisco Systems, Inc. All rights reserved.

Defining Static Routes

• When configuring static routes, consider the following:

By default, a static route will take precedence over a dynamic route because of its lower administrative distance. Without additional configuration, a dynamic route to a network will be ignored if a static route is present in the routing table for the same network.

To reduce the number of static route entries, define a summarized or default static route

272727© 2003, Cisco Systems, Inc. All rights reserved.

Specifying Interesting Traffic

282828© 2003, Cisco Systems, Inc. All rights reserved.

Configuring Dialer Information - PPP

292929© 2003, Cisco Systems, Inc. All rights reserved.

The dialer-group Command

303030© 2003, Cisco Systems, Inc. All rights reserved.

The dialer-map Command

313131© 2003, Cisco Systems, Inc. All rights reserved.

The dialer idle-timeout Command

323232© 2003, Cisco Systems, Inc. All rights reserved.

Dialer Profiles Overview

• Define encapsulation and access control lists

• Determine minimum or maximum calls

• Turn features on or off

333333© 2003, Cisco Systems, Inc. All rights reserved.

Dialer Profile Elements

343434© 2003, Cisco Systems, Inc. All rights reserved.

Configuring Dialer Interfaces

353535© 2003, Cisco Systems, Inc. All rights reserved.

Verifying DDR

• show dialer

• show dialer interface [BRI]

• show isdn active

• show isdn status

363636© 2003, Cisco Systems, Inc. All rights reserved.

Troubleshooting DDR

• debug isdn q921

• debug isdn q931

• debug dialer [events|packets]

• isdn call interface

• clear interface bri