Cisco Router 826 Routers Software Configuration Guide
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iii Cisco 826, 827, 828, 831, 836, and 837 and Cisco SOHO 76, 77, 78, 91, 96, and 97 Routers Software Configuration Guide 78-14565-03 CONTENTS About This Guidexi Audiencexi Organizationxii Conventionsxii Notes, Cautions, and Timesaversxii Command Conventionsxiii Related Documentsxiii Obtaining Documentationxiv Cisco.comxiv Documentation CD-ROMxiv Ordering Documentationxv Documentation Feedbackxv Obtaining Technical Assistancexv Cisco.comxvi Technical Assistance Centerxvi Obtaining Additional Publications and Informationxvii CHAPTER 1Concepts1-1 Overview1-1 ADSL1-3 SHDSL1-3 Network Protocols1-3 IP1-3 Routing Protocol Options1-4 RIP1-4 Enhanced IGRP1-5 PPP Authentication Protocols1-5 PAP1-5 CHAP1-6 TACACS+1-6
Contents iv Cisco 826, 827, 828, 831, 836, and 837 and Cisco SOHO 76, 77, 78, 91, 96, and 97 Routers Software Configuration Guide 78-14565-03 Network Interfaces 1-6 Ethernet1-6 ATM1-7 Dialer Interface1-7 Dial Backup1-8 Backup Interface1-8 Floating Static Routes1-8 Dialer Watch1-8 NAT1-9 Easy IP (Phase 1)1-9 Easy IP (Phase 2)1-10 VoIP1-10 H.3231-10 Voice Dial Peers1-11 QoS1-11 IP Precedence1-12 PPP Fragmentation and Interleaving1-12 CBWFQ1-12 RSVP1-13 Low Latency Queuing1-13 Access Lists1-13 CHAPTER 2Network Scenarios2-1 Cisco 827 Router Network Connections2-2 Cisco 831 Router Virtual Private Network Connections2-3 Cisco 836 or Cisco SOHO 96 Network Connection2-4 Cisco 837 Router Network Connections2-5 Internet Access Scenarios2-6 Before You Configure Your Internet Access Network2-6 Replacing a Bridge or Modem with a Cisco 827 Router2-6 PPP over Ethernet with NAT2-8 PPP over Ethernet with NAT Using a Dial-on-Demand PPP-over- Ethernet Connection2-11 PPP over ATM with NAT2-13 Configuring Dial Backup2-16 Dial Backup Feature Limitations and Configuration2-16 Configuring Dial Backup and Remote Management for the Cisco 837 and Cisco SOHO 97 Routers 2-19
Contents v Cisco 826, 827, 828, 831, 836, and 837 and Cisco SOHO 76, 77, 78, 91, 96, and 97 Routers Software Configuration Guide 78-14565-03 Configuring Dial Backup and Remote Management for the Cisco 836 and Cisco SOHO 96 Routers 2-20 PPP over ATM with Centrally Managed Addressing and with Dial Backup2-21 Configuring Dial Backup and Remote Management for the Cisco 836 Router2-25 Configuring Dial Backup and Remote Management Settings2-26 Configuring the Aggregator and ISDN Peer Router2-31 Configuring Remote Management for the Cisco SOHO 97 Router2-32 Configuring Dial Backup and Remote Management for Cisco 831 Router and Cisco SOHO 91 Router 2-34 Configuring the DHCP Server2-39 Configuring the Ethernet Interface 2-40 RFC 1483 Encapsulation with NAT2-43 Integrated Routing and Bridging2-47 Concurrent Routing and Bridging2-50 Voice Scenario2-55 Data Network2-56 Voice Network2-57 Configuration Tasks2-58 CHAPTER 3Basic Router Configuration3-1 Before You Configure Your Network3-2 Configuring Basic Parameters3-2 Configuring Global Parameters3-3 Configuring the Ethernet Interface3-3 Configuring the Dialer Interface3-4 Configuring the Loopback Interface3-5 Configuring the Asynchronous Transfer Mode Interface3-7 Configuring Command-Line Access to the Router3-9 Configuring Bridging3-9 Configuration Example3-10 Verifying Your Configuration3-11 Configuring Static Routing3-12 Configuration Example3-12 Verifying Your Configuration3-12 Configuring Dynamic Routing3-13 Configuring RIP3-13 Configuring IP Enhanced IGRP3-14 Configuration Example3-14 Verifying Your Configuration3-15
Contents vi Cisco 826, 827, 828, 831, 836, and 837 and Cisco SOHO 76, 77, 78, 91, 96, and 97 Routers Software Configuration Guide 78-14565-03 Configuring Addressing Parameters3-15 Configuring NAT3-15 Configuring Easy IP (Phase 1)3-17 Configuring Easy IP (Phase 2)3-18 Configuring DHCP3-19 Configuring DHCP Client Support3-19 Configuring DHCP Server3-21 Configuring the DHCP Relay3-22 Configuring TACACS+3-22 Configuring an Extended Access List3-23 Configuration Example3-24 Configuring Quality of Service Parameters3-24 Configuring a Single PVC Environment3-25 Configuring a Multiple PVC Environment3-27 Configuring Multilink PPP Fragmentation and Interleaving3-31 Configuring IP Precedence3-33 Configuring RSVP3-33 Configuring Dial Backup3-34 Specifying the Backup Interface3-35 Defining Backup Line Delays3-35 Defining Traffic Load Threshold3-35 Dial Backup Using the Console Port3-35 Configuration Example3-36 Configuration Example3-38 Configuring IGMP Proxy and Sparse Mode3-39 Configuration Example3-40 Configuring IP Security and GRE Tunneling3-41 Configuring Internet Protocol Parameters3-42 Configuring an Access List3-42 Configuring IPSec3-42 Configuring a GRE Tunnel Interface3-43 Configuring the Ethernet Interfaces3-43 Configuring Static Routes3-44 Configuring and Monitoring High-Speed Crypto3-44 Configuration Example3-44 Configuring Multilink PPP Fragmentation and Interleaving3-46 Configuration Example3-47 Verifying Your Configuration3-48 Configuring IP Precedence3-48
Contents vii Cisco 826, 827, 828, 831, 836, and 837 and Cisco SOHO 76, 77, 78, 91, 96, and 97 Routers Software Configuration Guide 78-14565-03 Configuring Voice3-49 Prerequisite Tasks3-49 Configuring Voice for H.323 Signaling3-49 Configuration Example3-51 Cisco 827 Routers Configuration Examples3-52 Cisco 827-4V Router Configuration3-53 Cisco 827 Router Configuration3-54 Corporate or Endpoint Router Configuration for Data Network3-55 Corporate or Endpoint Router Configuration for Data and Voice Network3-56 CHAPTER 4Advanced Router Configuration4-1 Configuring PPP over Ethernet Support4-2 Configuring PPPoE Client Support4-2 Configuring TCP Maximum Segment Size for PPP over Ethernet4-3 Configuring TCP Maximum Segment Size for PPPoE4-4 Configuration Example4-5 Configuring Low-Latency Queuing and Link Fragmentation and Interleaving4-5 Configuring LLQ4-6 Configuring LFI4-6 Configuring Class-Based Traffic Shaping to Support Low Latency Queuing4-7 Configuring CBTS for LLQ4-7 Configuring the Length of the PVC Transmit Ring4-10 Configuration Example4-10 Configuring DHCP Server Import4-11 Configuration Examples4-12 Configuring IP Control Protocol Subnet Mask Delivery4-15 Configuration Examples4-17 Configuring the Service Assurance Agent4-21 Configuring Secure Shell4-21 Configuring IP Named Access Lists4-22 Configuring International Phone Support4-22 Configuration Example4-23 International Tone, Cadence, Ring Frequency, and Impedance Support4-23 Configuring International Caller ID4-25 Configuring Committed Access Rate4-27 Configuration Example4-27 Configuring VPN IPSec Support Through NAT4-27 NAT Default Inside Server Enhancement4-28
Contents viii Cisco 826, 827, 828, 831, 836, and 837 and Cisco SOHO 76, 77, 78, 91, 96, and 97 Routers Software Configuration Guide 78-14565-03 Configuration Example4-28 Configuring VoAAL2 ATM Forum Profile 9 Support4-29 Configuring ATM Forum Profile 94-29 Configuration Example4-31 Configuring ATM OAM F5 Continuity Check Support4-31 oam-pvc manage cc Command4-32 oam retry cc activation-count deactivation-count retry-frequency Command4-33 oam-pvc manage cc deny Command4-34 debug atm oam cc Command4-34 Example Output4-35 Configuring RADIUS Support4-36 Configuring Cisco Easy VPN Client4-36 Easy VPN Documentation4-37 Configuration Example4-37 Configuring Dial-on-Demand Routing for PPPoE Client4-38 Configuring DDR for a PPPoE Client4-39 Configuring Weighted Fair Queuing4-40 Configuring DSL Commands4-41 Configuration Example4-42 Enabling the DSL Training Log4-42 Selecting Secondary DSL Firmware4-43 Configuring FTP Client4-45 CHAPTER 5Troubleshooting5-1 Before Contacting Cisco or Your Reseller5-1 ADSL Troubleshooting5-2 ADSL Cable Requirements5-2 G.SHDSL Troubleshooting5-2 show dsl interface Command5-2 ATM Troubleshooting Commands5-5 ping atm interface Command5-5 show interface Command5-5 show atm interface Command5-7 debug atm Commands5-8 Software Upgrade Methods5-11 Recovering a Lost Password5-11 Changing the Configuration Register5-12 Resetting the Router5-13