A Word on IOS and JUNOS

The examples used throughout this book are provided in either Cisco Systems IOS or Juniper Networks JUNOS. In the early chapters, I occasionally provide examples from both operating systems. However, my intention is to provide you with an understanding of the protocols themselves, not to attempt to teach you a specific operating system. I have used IOS and JUNOS simply because they are the router operating systems I know and have access to. Armed with the information in this book you should be able to pick up a manual from any router vendor and easily configure and troubleshoot OSPF and IS-IS on that vendor's system.