Is UPnP a rubish protocol ???

[stefano_mbp]

I have been the CIO in many large companies therefore I know quite well what I’m talking about, and I’ve many examples about how can be easy to let a network go nuts, different firmware on different stacks is the first example (and we are on the same vendor … try to think about different vendors switches).
For first in a large company there never are cascades of switches but “stackable switches” are used (like Cisco Catalyst 9300 series) … “stackable” is totally different from “cascade”
About speed : let me assume you have a 1Gbps network and switches according to this speed, then on each port will be available 1Gbps, but if you connect a switch in cascade then the original 1Gbps will be shared by all ports of the “cascade” switch hence the speed available on the cascade switch ports will be less than 1Gbps. It’s quite easy to start with 1Gbps and end up with less than 10Mbps
About protocols: each vendor will set up the firmware according to … his choices, therefore one vendor could block UPNP or something else. This is for unmanaged switches, different story for managed switched where you can (but you must be able to) define anything as you like.