Cisco® ISP Essentials

Appendix C. Example Configurations

This appendix aims to give ISPs learning about the art of constructing an ISP caliber backbone a little guidance on some of the configuration steps and design hints that have been covered throughout the “IOS Essentials” whitepaper and this book. The common elements of an ISP’s network have all been included, including border, aggregation, and dial access routers. Clearly it is almost impossible to give sample configurations suitable for all ISPs. The following aims to give guidance to small or medium ISPs that have not been in operations long so that they gain the general principles of what is required for the network routers.

Simple Network Plan

Figure C-1 shows a simple network diagram of a basic ISP point of ...