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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
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