1 © 2003, Cisco Systems, Inc. All rights reserved. CCNA 4 v3.0 Module 4 ISDN 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 Standards E Protocols – Recommend telephone network standards for ISDN. For example, the E.164 protocol describes international addressing for ISDN. I Protocols – Deal with concepts, terminology, and general methods. The I.100 series includes general ISDN concepts and the structure of other I-series recommendations. I.200 deals with service aspects of ISDN. I.300 describes network aspects. I.400 describes how the UNI is provided. Q Protocols – Cover how switching and signaling should operate. The term signaling in this context means the process of establishing an ISDN call.

777 © 2003, Cisco Systems, Inc. All rights reserved. ISDN Access Options

888 © 2003, Cisco Systems, Inc. All rights reserved. ISDN 3-Layer Model

999 © 2003, Cisco Systems, Inc. All rights reserved. Q.931 Messaging-Call Setup Example

10 © 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.

11 © 2003, Cisco Systems, Inc. All rights reserved. ISDN Functions and Reference Points

12 © 2003, Cisco Systems, Inc. All rights reserved. ISDN Functions and Reference Points

13 © 2003, Cisco Systems, Inc. All rights reserved. BRI Reference Points

14 © 2003, Cisco Systems, Inc. All rights reserved. Cisco ISDN BRI Interfaces

15 © 2003, Cisco Systems, Inc. All rights reserved. ISDN Interfaces S/T ISDN InterfaceU ISDN Interface

16 © 2003, Cisco Systems, Inc. All rights reserved. ISDN Switch Types

17 © 2003, Cisco Systems, Inc. All rights reserved. Configuring ISDN BRI

18 © 2003, Cisco Systems, Inc. All rights reserved. Configuring ISDN BRI

19 © 2003, Cisco Systems, Inc. All rights reserved. Configuring ISDN PRI

20 © 2003, Cisco Systems, Inc. All rights reserved. Switch Types Available for ISDN PRI Configuration

21 © 2003, Cisco Systems, Inc. All rights reserved. ISDN PRI Examples

22 © 2003, Cisco Systems, Inc. All rights reserved. Verifying ISDN Configuration

23 © 2003, Cisco Systems, Inc. All rights reserved. Troubleshooting ISDN Configuration

24 © 2003, Cisco Systems, Inc. All rights reserved. DDR Operation

25 © 2003, Cisco Systems, Inc. All rights reserved. Legacy DDR Legacy DDR is a term used to define a very basic DDR configuration in which a single set of dialer parameters is applied to an interface. If multiple unique dialer configurations are needed on one interface, then dialer profiles should be used. To configure legacy DDR perform the following steps: Define static routes Specify interesting traffic Configure the dialer information

26 © 2003, Cisco Systems, Inc. All rights reserved. DDR Operation

27 © 2003, Cisco Systems, Inc. All rights reserved. Configuring Legacy DDR

28 © 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

29 © 2003, Cisco Systems, Inc. All rights reserved. Specifying Interesting Traffic

30 © 2003, Cisco Systems, Inc. All rights reserved. Configuring Dialer Information - PPP

31 © 2003, Cisco Systems, Inc. All rights reserved. The dialer-group Command

32 © 2003, Cisco Systems, Inc. All rights reserved. The dialer-map Command

33 © 2003, Cisco Systems, Inc. All rights reserved. The dialer idle-timeout Command

34 © 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

35 © 2003, Cisco Systems, Inc. All rights reserved. Dialer Profile Elements

36 © 2003, Cisco Systems, Inc. All rights reserved. Configuring Dialer Interfaces

37 © 2003, Cisco Systems, Inc. All rights reserved. Verifying DDR show dialer show dialer interface [BRI] show isdn active show isdn status

38 © 2003, Cisco Systems, Inc. All rights reserved. clear interface bri This command will clear the hardware logic for the specified slot/port. This is often used with ISDN BRI interfaces to force the interface to resend the SPIDs.

39 © 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

40 © 2003, Cisco Systems, Inc. All rights reserved. Objectives ISDN concepts ISDN configuration DDR configuration