A network administrator once told me that if your network is based on Cisco devices one thing that you should not forget to work with is CDP (Cisco Discovery Protocol). A few years later I found myself working with a lot of Cisco devices and VMware ESX Servers and discovered that one of the most interesting things is the ability to understand the network topology using Cisco Discovery Protocol o CDP.

By default CDP is configured on VMware ESX Servers just for listen their neighborhoods on the network. To verify this type the following command: