Overview
In the two previous chapters, you learned how to enable permanent connections between a central site and a branch office by using X.25 or Frame Relay. How can you provide connectivity between the two sites if the permanent connection goes down?

This chapter describes the need and circumstances for using dial-backup functionality.

You will learn how to configure a backup connection for a primary link, such as a Frame Relay serial connection, that can be used if the link goes down or is overutilized.