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C O N T E N T S Preparing for Broadband Access Aggregation 1 Finding Feature Information 1 Prerequisites for Preparing for Broadband Access Aggregation 2 Restrictions for Preparing for Broadband Access Aggregation 2 Information About Preparing for Broadband Access Aggregation 2 Virtual-Access Interfaces 2 Autosense for ATM PVCs 3 Virtual Access Interface Precloning 3 Configuration Enhancements for Broadband Scalability 3 Virtual Access Subinterfaces 3 Virtual Template Compatibility with Subinterfaces 4 Benefits of Using Broadband Scalability Features 4 How to Prepare for Broadband Access Aggregation 4 Configuring PVCs 5 Benefits of Configuring a PVC Range 5 Configuring an ATM PVC or PVC Range 5 Configuring an Individual PVC Within a PVC Range 7 Configuring a Virtual Template 9 Precloning Virtual-Access Interfaces 10 Configuring Enhancements for Broadband Scalability 11 Verifying Virtual-Template Compatibility with Virtual-Access Subinterfaces 11 Disabling Virtual-Access Subinterfaces 12 Configuration Examples for Preparing for Broadband Access Aggregation 13 ATM PVC Range on a Point-to-Point Subinterface Example 13 ATM PVC Range on a Multipoint Subinterface Example 14 Individual PVC Within a PVC Range Configuration Example 14 Virtual-Access Subinterfaces Configuration Examples 14 Virtual-Access Subinterface Configuration Example 14 Testing a Virtual Template for Compatibility with Subinterfaces Example 15 Broadband Access Aggregation and DSL Configuration Guide, Cisco IOS Release 15MT iii Contents Where to Go Next 16 Additional References 17 Feature Information for Preparing for Broadband Access Aggregation 18 Understanding Broadband Access Aggregation 21 Finding Feature Information 21 Information About Broadband Access Aggregation 21 Encapsulation Protocols 22 Layer 2 Tunneling Protocol 22 ATM Services 23 PPPoE 23 PPPoEoE PPPoEo802.1q 23 PPPoA 23 Routed Bridge Encapsulation 24 Cisco Subscriber Service Switch 24 RADIUS Support in Cisco IOS 25 Additional References 25 Glossary 26 Providing Protocol Support for Broadband Access Aggregation of PPP over ATM Sessions 29 Finding Feature Information 29 Prerequisites for Providing Protocol Support for Broadband Access Aggregation of PPP over ATM Sessions 29 Restrictions for Providing Protocol Support for Broadband Access Aggregation of PPP over ATM Sessions 30 Information About Providing Protocol Support for Broadband Access Aggregation of PPP over ATM Sessions 30 PPP over ATM Configuration Scenario 30 Virtual Access Interface 31 Autosense for ATM PVCs 31 Benefits of Autosense for ATM PVCs 31 How to Provide Protocol Support for Broadband Access Aggregation of PPP over ATM Sessions 32 Configuring IETF-Compliant MUX Encapsulated PPP over ATM 32 Configuring IETF-Compliant LLC Encapsulated PPP over ATM 35 Configuring Cisco-Proprietary PPP over ATM PVCs 39 Configuring SVCs for NAPs and NSPs 43 Configuring PPPoA Autosense for a Single PVC 47 Broadband Access Aggregation and DSL Configuration Guide, Cisco IOS Release 15MT iv Contents Configuring PPPoA Autosense for a VC Class 49 Verifying PPPoA Autosense for ATM PVCs 51 Configuration Examples for Configuring PPP over ATM 53 IETF-Compliant MUX Encapsulated PPP over ATM Configuration Examples 53 IETF-Compliant PPP over ATM with Different Traffic-Shaping Parameters Example 53 ADSL Termination Example 54 Two Routers with Back-to-Back PVCs Example 55 Multiplexed Encapsulation Using VC Class Example 56 IETF-Compliant LLC Encapsulated PPP over ATM Configuration Examples 56 Configuring IETF-Compliant PPP over ATM LLC Encapsulation Example 56 Overriding a Virtual Template for IETF-Compliant PPP over ATM Example 57 Disabling IETF-Compliant PPP over ATM LLC Encapsulation on a Specific VC Example 57 Cisco Proprietary-PPP-over-ATM Example 58 PPP over an ATM SVC Configuration Example 58 PPPoA PPPoE Autosense on an ATM PVC Example 58 PPPoA PPPoE Autosense on a VC Class Example 59 PPPoA PPPoE Autosense on Multiple VC Classes and Virtual Templates Example 60 Where to Go Next 61 Additional References 61 Feature Information for Providing Protocol Support for Broadband Access Aggregation of PPP over ATM Sessions 62 Upstream PPPoX Connection Speed Transfer at LAC 65 Finding Feature Information 65 Prerequisites for Upstream PPPoX Connection Speed Transfer at LAC 65 Restrictions for Upstream PPPoX Connection Speed Transfer at LAC 66 Information About Upstream PPPoX Connection Speed Transfer at LAC 66 Upstream PPPoX Connection Speed Transfer at LAC 66 Benefits of Upstream PPPoX Connection Speed Transfer at LAC 66 How to Configure Upstream Connection Speed Transfer at LAC 67 Configuring Upstream PPPoX Connection Speed Transfer at the LAC 67 Configuring Upstream PPPoX Connection Speed Transfer at LAC on a PVC 67 Configuring Upstream PPPoX Connection Speed Transfer at LAC on VC 68 Configuration Examples for Upstream PPPoX Connection Speed Transfer at LAC 70 Configuring Upstream PPPoX Connection Speed Transfer at LAC Example 70 Additional References 70 Broadband Access Aggregation and DSL Configuration Guide, Cisco IOS Release 15MT v Contents Feature Information for Upstream PPPoX Connection Speed Transfer at LAC 72 Providing Session Limit Support 75 Finding Feature Information 75 Information About Providing Session Limit Support 75 Benefits of Providing Session Limit Support 75 How to Provide Session Limit Support 75 Specifying the Maximum Number of PPPoE Sessions on the Router 76 Specifying the Maximum Number of PPPoE Sessions on a Gigabit Ethernet Interface 77 Configuration Examples for Providing Session Limit Support 79 Specifying the Maximum Number of PPPoE Sessions on a Router Example 79 Specifying the Maximum Number of PPPoE Sessions on a Gigabit Ethernet Interface Example 79 Additional References 79 Feature Information for Providing Session Limit Support 81 Monitoring PPPoE Sessions with SNMP 83 Finding Feature Information 83 Prerequisites for Monitoring PPPoE Sessions with SNMP 83 Restrictions for Monitoring PPPoE Sessions with SNMP 84 Information About Monitoring PPPoE Sessions with SNMP 84 Network Management Protocol 84 PPPoE Session Count MIB 84 Benefits of Monitoring PPPoE Sessions with SNMP 85 How to Configure SNMP Monitoring of PPPoE Sessions 85 Enabling PPPoE Session Count SNMP Traps 86 Configuring the PPPoE Session-Count Threshold for the Router Using VPDN Groups 87 Configuring the PPPoE Session-Count Threshold for the Router Using BBA Groups 88 Configuring the PPPoE Session-Count Threshold for a PVC 89 Configuring the PPPoE Session-Count Threshold for a VC Class 91 Configuring the PPPoE Session-Count Threshold for an ATM PVC Range 92 Configuring the PPPoE Session-Count Threshold for an Individual PVC Within a Range 93 Verifying PPPoE Session-Count Thresholds 95 Monitoring and Maintaining PPPoE Session Counts and SNMP Notifications 96 Configuration Examples