Cisco IOS Dial Technologies Configuration Guide Release 12.2 Corporate Headquarters Cisco Systems, Inc. 170 West Tasman Drive San Jose, CA 95134-1706 USA http://www.cisco.com Tel: 408 526-4000 800 553-NETS (6387) Fax: 408 526-4100 Customer Order Number: DOC-7812090= Text Part Number: 78-12090-02 THE SPECIFICATIONS AND INFORMATION REGARDING THE PRODUCTS IN THIS MANUAL ARE SUBJECT TO CHANGE WITHOUT NOTICE. ALL STATEMENTS, INFORMATION, AND RECOMMENDATIONS IN THIS MANUAL ARE BELIEVED TO BE ACCURATE BUT ARE PRESENTED WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED. USERS MUST TAKE FULL RESPONSIBILITY FOR THEIR APPLICATION OF ANY PRODUCTS. THE SOFTWARE LICENSE AND LIMITED WARRANTY FOR THE ACCOMPANYING PRODUCT ARE SET FORTH IN THE INFORMATION PACKET THAT SHIPPED WITH THE PRODUCT AND ARE INCORPORATED HEREIN BY THIS REFERENCE. IF YOU ARE UNABLE TO LOCATE THE SOFTWARE LICENSE OR LIMITED WARRANTY, CONTACT YOUR CISCO REPRESENTATIVE FOR A COPY. 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CONTENTS About Cisco IOS Software Documentation xxxvii Documentation Objectives xxxvii Audience xxxvii Documentation Organization xxxvii Documentation Modules xxxvii Master Indexes xl Supporting Documents and Resources xl New and Changed Information xli Document Conventions xli Obtaining Documentation xlii World Wide Web xlii Documentation CD-ROM xliii Ordering Documentation xliii Documentation Feedback xliii Obtaining Technical Assistance xliii Cisco.com xliv Technical Assistance Center xliv Contacting TAC by Using the Cisco TAC Website xliv Contacting TAC by Telephone xliv Using Cisco IOS Software xlvii Understanding Command Modes xlvii Getting Help xlviii Example: How to Find Command Options xlix Using the no and default Forms of Commands li Saving Configuration Changes lii Filtering Output from the show and more Commands lii Identifying Supported Platforms liii Using Feature Navigator liii Using Software Release Notes liii iii Contents DIAL INTERFACES, CONTROLLERS, AND LINES Overview of Dial Interfaces, Controllers, and Lines DC-2 Cisco IOS Dial Components DC-2 Logical Constructs DC-4 Asynchronous Interfaces DC-4 Group Asynchronous Interfaces DC-5 Virtual Template Interfaces DC-5 Templates for Virtual Access Interfaces DC-6 Templates for Protocol Translation DC-6 Logical Interfaces DC-6 Dialer Interfaces DC-7 Virtual Access Interfaces DC-8 Virtual Asynchronous Interfaces DC-9 Circuit-Switched Digital Calls DC-9 T1 and E1 Controllers DC-10 Non-ISDN Channelized T1 and Channelized E1 Lines DC-10 ISDN Service DC-11 ISDN BRI DC-12 ISDN PRI DC-12 Line Types DC-14 Relationship Between Lines and Interfaces DC-15 Asynchronous Interfaces and Physical Terminal Lines DC-15 Synchronous Interfaces and Virtual Terminal Lines DC-16 Encapsulation Types DC-17 Configuring Asynchronous Lines and Interfaces DC-18 How to Configure Asynchronous Interfaces and Lines DC-18 Configuring a Typical Asynchronous Interface DC-19 Monitoring and Maintaining Asynchronous Connections DC-19 Creating a Group Asynchronous Interface DC-20 Verifying the Group Interface Configuration DC-21 Configuring Asynchronous Rotary Line Queueing DC-24 Verifying Asynchronous Rotary Line Queueing DC-25 Troubleshooting Asynchronous Rotary Lines DC-25 Monitoring and Maintaining Asynchronous Rotary Line Queues DC-26 Configuring Autoselect DC-26 Verifying Autoselect PPP DC-27 Verifying Autoselect ARA DC-27 iv Contents How to Configure Other Asynchronous Line and Interface Features DC-28 Configuring the Auxiliary (AUX) Port DC-28 Establishing and Controlling the EXEC Process DC-29 Enabling Routing on Asynchronous Interfaces DC-30 Configuring Dedicated or Interactive PPP and SLIP Sessions DC-30 Conserving Network Addresses DC-31 Using Advanced Addressing Methods for Remote Devices DC-32 Assigning a Default Asynchronous Address DC-32 Allowing an Asynchronous Address to Be Assigned Dynamically DC-32 Optimizing Available Bandwidth DC-33 Configuring Header Compression DC-33 Forcing Header Compression at the EXEC Level DC-34 Configuration Examples for Asynchronous Interfaces and Lines DC-34 Interface and Line Configuration Examples DC-35 Asynchronous Interface Backup DDR Configuration Example DC-35 Passive Header Compression and Default Address Example DC-35 High-Density Dial-In Solution Using Autoselect and EXEC Control Example DC-35 Asynchronous Line Backup DDR Configuration Example DC-36 Line AUX Configuration Example DC-36 Rotary Group Examples DC-36 Dedicated Asynchronous Interface Configuration Example DC-37 Access Restriction on the Asynchronous Interface Example DC-37 Group and Member Asynchronous Interface Examples DC-37 Asynchronous Group Interface Examples DC-38 Modem Asynchronous Group Example DC-38 High-Density Dial-In Solution Using an Asynchronous Group DC-39 Asynchronous Interface Address Pool Examples DC-39 DHCP Pooling Example DC-39 Local Pooling Example DC-39 Configuring Specific IP Addresses for an Interface DC-40 IP and SLIP Using an Asynchronous Interface Example DC-40 IP and PPP Asynchronous Interface Configuration Example DC-40 Asynchronous Routing and Dynamic Addressing Configuration Example DC-41 TCP Header Compression Configuration Example DC-41 Network Address Conservation Using the ip unnumbered Command Example DC-41 Asynchronous Interface As the Only Network Interface Example DC-42 Routing on a Dedicated Dial-In Router Example DC-42 IGRP Configuration Example DC-43 v Contents Configuring Asynchronous Serial Traffic over UDP DC-44 UDPTN Overview DC-44 How to Configure Asynchronous Serial Traffic over UDP DC-45 Preparing to Configure Asynchronous Serial Traffic over UDP DC-45 Configuring a Line for UDPTN DC-45 Enabling UDPTN DC-46 Verifying UDPTN Traffic DC-46 Configuration Examples for UDPTN DC-47 Multicast UDPTN Example DC-47 Broadcast UDPTN Example DC-48 Point-to-Point UDPTN Example DC-48 MODEM CONFIGURATION AND MANAGEMENT Overview of Modem Interfaces DC-52 Cisco Modems and Cisco IOS Modem Features DC-52 Cisco IOS Modem Components DC-53 Logical Constructs in Modem Configurations DC-55 Asynchronous Interfaces DC-55 Group Asynchronous Interfaces DC-56 Modem Lines and Asynchronous Interfaces DC-57 Modem Calls DC-58 Asynchronous Line Configuration DC-58 Absolute Versus Relative Line Numbers DC-58 Line and Modem Numbering Issues DC-59 Decimal TCP Port Numbers for Line Connections DC-60 Signal and Flow Control Overview DC-61 Configuring and Managing Integrated Modems DC-62 Modems and Modem Feature Support DC-62 V.90 Modem Standard DC-63 V.110 Bit Rate Adaption Standard DC-63 V.120 Bit Rate Adaptation Standard DC-65 Managing Modems DC-65 Managing SPE Firmware DC-66 Configuring Modems in Cisco Access Servers DC-68 Configuring Modem Lines DC-68 Verifying the Dial-In Connection DC-69 Troubleshooting the Dial-In Connection DC-70 vi Contents Configuring the Modem Using a Modemcap DC-70 Configuring the Modem Circuit Interface DC-72 Comparison of NextPort SPE and MICA Modem Commands DC-72 Configuring Cisco Integrated Modems Using Modem Attention Commands DC-75 Using Modem Dial Modifiers on Cisco MICA Modems DC-75 Changing Configurations Manually in Integrated Microcom Modems DC-76 Configuring Leased-Line Support for Analog Modems DC-77 Configuring