Hi Rene,
I work as technical support in Internet Services & Communications company and we don’t use Cisco products only, we also use other network products from different vendors like Ubiquiti, mikrotik, Exalt, etc. and we connect all these different products with each other!!
so when I use CDP to show which devices connected to cisco switch or router I noticed that information of different vendors products also appears to me!!
My question is why I show this info ? I know that CDP is Cisco proprietary so how it’s able to identify the products from other vendors???