Find CDP traffic on your Linux box

You can use tcpdump or wireshark but if you have a Linux box handy you can install: cdpr. It makes life easy like this:

cdpr -v

Just follow the prompts for selecting the interface and wait for the cdp transmission to come through. Understand that some values, like Native VLAN, are in hexidecimal and you’ll need to convert it to decimal. Otherwise, happy hunting.