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1 © 2003, Cisco Systems, Inc. All rights reserved. CCNA 4 v3.0 Module 4 ISDN and DDR
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222 © 2003, Cisco Systems, Inc. All rights reserved. Objectives ISDN concepts ISDN configuration DDR configuration
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333 © 2003, Cisco Systems, Inc. All rights reserved. Digital Communication with ISDN
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444 © 2003, Cisco Systems, Inc. All rights reserved. ISDN Benefits
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555 © 2003, Cisco Systems, Inc. All rights reserved. ISDN Standards
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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.
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777 © 2003, Cisco Systems, Inc. All rights reserved. ISDN Access Options
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888 © 2003, Cisco Systems, Inc. All rights reserved. ISDN 3-Layer Model
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999 © 2003, Cisco Systems, Inc. All rights reserved. Q.931 Messaging-Call Setup Example
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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.
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11 © 2003, Cisco Systems, Inc. All rights reserved. ISDN Functions and Reference Points
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12 © 2003, Cisco Systems, Inc. All rights reserved. ISDN Functions and Reference Points
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13 © 2003, Cisco Systems, Inc. All rights reserved. BRI Reference Points
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14 © 2003, Cisco Systems, Inc. All rights reserved. Cisco ISDN BRI Interfaces
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15 © 2003, Cisco Systems, Inc. All rights reserved. ISDN Interfaces S/T ISDN InterfaceU ISDN Interface
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16 © 2003, Cisco Systems, Inc. All rights reserved. ISDN Switch Types
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17 © 2003, Cisco Systems, Inc. All rights reserved. Configuring ISDN BRI
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18 © 2003, Cisco Systems, Inc. All rights reserved. Configuring ISDN BRI
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19 © 2003, Cisco Systems, Inc. All rights reserved. Configuring ISDN PRI
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20 © 2003, Cisco Systems, Inc. All rights reserved. Switch Types Available for ISDN PRI Configuration
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21 © 2003, Cisco Systems, Inc. All rights reserved. ISDN PRI Examples
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22 © 2003, Cisco Systems, Inc. All rights reserved. Verifying ISDN Configuration
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23 © 2003, Cisco Systems, Inc. All rights reserved. Troubleshooting ISDN Configuration
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24 © 2003, Cisco Systems, Inc. All rights reserved. DDR Operation
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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
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26 © 2003, Cisco Systems, Inc. All rights reserved. DDR Operation
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27 © 2003, Cisco Systems, Inc. All rights reserved. Configuring Legacy DDR
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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
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29 © 2003, Cisco Systems, Inc. All rights reserved. Specifying Interesting Traffic
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30 © 2003, Cisco Systems, Inc. All rights reserved. Configuring Dialer Information - PPP
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31 © 2003, Cisco Systems, Inc. All rights reserved. The dialer-group Command
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32 © 2003, Cisco Systems, Inc. All rights reserved. The dialer-map Command
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33 © 2003, Cisco Systems, Inc. All rights reserved. The dialer idle-timeout Command
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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
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35 © 2003, Cisco Systems, Inc. All rights reserved. Dialer Profile Elements
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36 © 2003, Cisco Systems, Inc. All rights reserved. Configuring Dialer Interfaces
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37 © 2003, Cisco Systems, Inc. All rights reserved. Verifying DDR show dialer show dialer interface [BRI] show isdn active show isdn status
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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.
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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
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40 © 2003, Cisco Systems, Inc. All rights reserved. Objectives ISDN concepts ISDN configuration DDR configuration
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