Technical data

Table of Contents 9
L2TP Tunneling — Virtual Dial-Up 100
Introduction 100
L2TP Concepts 101
Configuration 104
Sample Configurations 106
Chapter 5. Command Line Interface Reference 115
Command Line Interface Conventions 115
Command Input 115
Command Output 115
Command Organization 115
? or HELP 116
System-Level Commands 117
Frame statistics - for Frame Relay routers only. Displays various
FR statisics. 120
Router Configuration Commands 127
Target Router System Configuration Commands (SYSTEM) 128
Target Router Ethernet LAN Bridging and Routing (ETH) 141
Remote Router Access Configuration (REMOTE) 151
Asymmetric Digital Subscriber Line Commands (ADSL) 174
Asynchronous Transfer Mode Commands (ATM) 176
DMT Command 179
Dual-Ethernet Router Commands (ETH) 180
High-Speed Digital Subscriber Line Commands (HDSL) 184
ISDN Digital Subscriber Line (IDSL) 187
Symmetric Digital Subscriber Line Commands (SDSL) 189
Dynamic Host Configuration Protocol Commands (DHCP) 193
L2TP — Virtual Dial-Up Configuration (L2TP) 204
Bridge Filtering Commands (FILTER BR) 212
Save Configuration Commands (SAVE) 215
Erase Configuration Commands (ERASE) 217
File System Commands 219
Chapter 6. Managing the Router 223
Simple Network Management Protocol (SNMP) 223
Telnet Remote Access 224
Client TFTP Facility 224
TFTP Server 224
BootP Server 225
Boot Code 225
Manual Boot Menu 225
Identifying Fatal Boot Failures 229
Software Kernel Upgrades 229
Booting and Upgrading from the LAN 229
Upgrading from the WAN Line 231
Backup and Restore Configuration Files 232
Backup Configuration Files (Recommended Procedure) 232
Restore Configuration Files 232
FLASH Memory Recovery Procedures 233
Recovering Kernels for Routers with Configuration Switches 233
Recovering Kernels for Routers with a Reset Button 234
Recovering Passwords and IP Addresses 235
Routers with Configuration Switches 235
Routers with a Reset Button 236