I have a training class and the powers at be would like for me to plug a desktop d-link dumb switch into a port on the 3560 switch that we currently have onsite. Will it be as simple as turning down the port security on the port that is in use or would I have to trunk or uplink the port that will be used. New admin here...thanks.
Hard to tell. I'm not sure what model of D-Link (you'll need to do your own research) because not all "smart" switch can support VLANs other than VLAN 1 or multiple VLANs. It's not as "easy" because in some cases it could potentially cause a network loop.
Disable UDLD, BPDU Guard and STP portfast on the 3560 port facing the D-Link.
When you connect the switch, make sure you are personally there nearest the port. The very first sign of "slow network" unplug the switch immediately from the D-Link.
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