I did a packet capture and looked at CDP packets. In the capture that I did I was seeing the length of the packet as 194 bytes. Given that the size may vary somewhat depending on what is being reported it still seems reasonable to say that CDP packets are about 200 bytes. They are transmitted at 60 second intervals. Who would say that 200 bytes every 60 seconds was a significant amount of traffic?
It might make more of an impression on them if you enabled CDP on an interface and did your own packet capture. Then you could show your management the actual packet size in your network. It is transmitted every 60 seconds. You can do calculations on the total traffic volume - and it will be a pretty small amount.
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