This article is all about how to use CDP(Cisco Discovery Protocol) on cisco routers. CDP stands for cisco discovery protocol designed by Cisco company to help the network administrators. In this tutorial, we learn about how to turn on or turn off CDP advertisement on the routers, why we use CDP and as well as see the information of directly and indirectly connected devices. By using CDP you can collect information about both locally attached devices and remote devices. CDP is used to share information about other directly connected Cisco equipment, such as the operating system version and IP address also. CDP can also be used for On-Demand Routing, which is a method of including routing information in CDP announcements so that dynamic routing protocols do not need to be used in simple networks. In this article, we will also learn about how to see ios version of neighbor routers and directly connected routers. So let’s start here how to configure CDP(Cisco Discovery Protocol) on cisco routers.