At this moment, I have a SG300-28P switch, but it's running out of ports. I want to order another SG300-28p, but I have no idea what modules and cables I need to stack those switches.
Does anyone know this?
Switch – How to expand the office network with a SG300-28P switch
cisco-sg300stackingswitchswitching
Best Answer
No much information in your question how you currently have the switch configured L2/L3 or both, but a quick answer is you aren't really stacking this model as it's not a stackable model. (stackables have only one IP address to manage the stack) You can daisy chain them together using one of the four ports on the front right side and configure as a trunk port on the existing and new switch. Can be technically done with any port but suggest one of the four. Or you can use one of the open SFP slots and buy two fiber modules.
Part number# MGBSX1 "1000BASE-SX SFP transceiver, for multimode fiber, 850 nm wavelength" and a 50 micron fiber patch cord between switches. Assuming in the same rack located together a 1-3 meter cable will do.
On most Cisco models if you use one of the SFP ports the the associated copper port is not usable.
All of the ports on the down stream switch are sharing the one uplink to the up stream switch. If this is a small office with mostly internet and low bandwidth traffic then this isn't a problem.
Again the ports are either configured as defaults and the two connecting ports between the switches will auto negotiate a link. But if an engineer has made changes to the default config then the link might not come up and spanning tree will shutdown the port.
Best to find a local network engineer that works with Cisco products and consult with them for the greatest success.