Cisco IOS Broadband and DSL Configuration Guide Release 12.4 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-7817496= Text Part Number: 78-17496-01 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 for Release 12.4 xxv Documentation Objectives xxv Audience xxv Documentation Organization for Cisco IOS Release 12.4 xxvi Document Conventions xxxii Obtaining Documentation xxxiii Cisco.com xxxiii Product Documentation DVD xxxiv Ordering Documentation xxxiv Documentation Feedback xxxiv Cisco Product Security Overview xxxv Reporting Security Problems in Cisco Products xxxv Obtaining Technical Assistance xxxvi Cisco Technical Support & Documentation Website xxxvi Submitting a Service Request xxxvi Definitions of Service Request Severity xxxvii Obtaining Additional Publications and Information xxxvii Using Cisco IOS Software for Release 12.4 xxxix Understanding Command Modes xxxix Getting Help xl Example: How to Find Command Options xli Using the no and default Forms of Commands xliv Saving Configuration Changes xliv Filtering Output from the show and more Commands xlv Finding Additional Feature Support Information xlv PART 1: BROADBAND ACCESS AGGREGATION OVERVIEW Configuring Broadband Access Aggregation Features Roadmap 3 Understanding Broadband Access Aggregation 7 Contents 7 Information About Broadband Access Aggregation 7 Cisco IOS Broadband and DSL Configuration Guide iii Contents Encapsulation Protocols 8 Layer 2 Tunneling Protocol 8 ATM Services 9 PPPoE 9 PPPoEoE/PPPoEo802.1q 10 PPPoA 10 Routed Bridge Encapsulation 10 Cisco Subscriber Service Switch 11 RADIUS Support in Cisco IOS 11 Additional References 12 Related Documents 12 Standards 12 MIBs 12 RFCs 12 Technical Assistance 13 Glossary 14 Preparing for Broadband Access Aggregation 17 Contents 17 Prerequisites for Preparing for Broadband Access Aggregation 18 Restrictions for Preparing for Broadband Access Aggregation 18 Information About Preparing for Broadband Access Aggregation 18 Virtual-Access Interfaces 18 Autosense for ATM PVCs 19 Virtual Access Interface Precloning 19 Configuration Enhancements for Broadband Scalability 19 Virtual Access Subinterfaces 19 Virtual Template Compatibility with Subinterfaces 20 Benefits of Using Broadband Scalability Features 20 How to Prepare for Broadband Access Aggregation 21 Configuring PVCs 21 Benefits of Configuring a PVC Range 21 Configuring an ATM PVC or PVC Range 21 Example 23 Configuring an Individual PVC Within a PVC Range 23 Configuring a Virtual Template 25 Precloning Virtual-Access Interfaces 26 Example 27 Configuring Enhancements for Broadband Scalability 27 Cisco IOS Broadband and DSL Configuration Guide iv Contents Verifying Virtual-Template Compatibility with Virtual-Access Subinterfaces 27 Example 28 Disabling Virtual-Access Subinterfaces 28 Configuration Examples for Preparing for Broadband Access Aggregation 29 ATM PVC Range on a Point-to-Point Subinterface: Example 29 ATM PVC Range on a Multipoint Subinterface: Example 29 Individual PVC Within a PVC Range Configuration: Example 30 Virtual-Access Subinterfaces Configuration: Examples 30 Virtual-Access Subinterface Configuration: Example 30 Testing a Virtual Template for Compatibility with Subinterfaces: Example 32 Where to Go Next 32 Additional References 33 Related Documents 33 Standards 33 MIBs 34 RFCs 34 Technical Assistance 34 Feature Information for Preparing for Broadband Access Aggregation 35 PART 2: PPPOA, PPPOE, PPPOX Providing Protocol Support for Broadband Access Aggregation of PPP over ATM Sessions 39 Contents 39 Prerequisites for Providing Protocol Support for Broadband Access Aggregation of PPP over ATM Sessions 40 Restrictions for Providing Protocol Support for Broadband Access Aggregation of PPP over ATM Sessions 40 Information About Providing Protocol Support for Broadband Access Aggregation of PPP over ATM Sessions 40 PPP over ATM Configuration Scenario 40 Virtual Access Interface 41 Autosense for ATM PVCs 42 Benefits of Autosense for ATM PVCs 42 How to Provide Protocol Support for Broadband Access Aggregation of PPP over ATM Sessions 42 Configuring IETF-Compliant MUX Encapsulated PPP over ATM 42 Configuring IETF-Compliant LLC Encapsulated PPP over ATM 45 Configuring Cisco-Proprietary PPP over ATM PVCs 47 Configuring SVCs for NAPs and NSPs 49 Configuring PPPoA Autosense for a Single PVC 52 Cisco IOS Broadband and DSL Configuration Guide v Contents Configuring PPPoA Autosense for a VC Class 54 Verifying PPPoA Autosense for ATM PVCs 56 Configuration Examples for Configuring PPP over ATM 57 IETF-Compliant MUX Encapsulated PPP over ATM Configuration: Examples 57 IETF-Compliant PPP over ATM with Different Traffic-Shaping Parameters: Example 57 ADSL Termination: Example 58 Two Routers with Back-to-Back PVCs: Example 60 Multiplexed Encapsulation Using VC Class: Example 61 IETF-Compliant LLC Encapsulated PPP over ATM Configuration: Examples 61 Configuring IETF-Compliant PPP over ATM LLC Encapsulation: Example 61 Overriding a Virtual Template for IETF-Compliant PPP over ATM: Example 62 Disabling IETF-Compliant PPP over ATM LLC Encapsulation on a Specific VC: Example 62 Cisco Proprietary-PPP-over-ATM: Example 62 PPP over an ATM SVC Configuration: Example 63 PPPoA/PPPoE Autosense on an ATM PVC: Example 63 PPPoA/PPPoE Autosense on a VC Class: Example 64 PPPoA/PPPoE Autosense on Multiple VC Classes and Virtual Templates: Example 64 Where to Go Next 65 Additional References 65 Related Documents 66 Standards 66 MIBs 66 RFCs 66 Technical Assistance 66 Feature Information for Providing Protocol Support for Broadband Access Aggregation of PPP over ATM Sessions 67 Providing Protocol Support for Broadband Access Aggregation of PPPoE Sessions 69 Contents 69 Prerequisites for Providing Protocol Support for Broadband Access Aggregation of PPPoE Sessions 70 Restrictions for Providing Protocol Support for Broadband Access Aggregation of PPPoE Sessions 70 Information About Providing Protocol Support for Broadband Access Aggregation for PPPoE Sessions 71 PPPoE Specification Definition 71 Benefits of PPPoE Profiles 71 PPPoE Connection Throttling 71 PPPoE Profile Assignment to