We have created a Mirror (Span) port on our Core switch in order to see all traffic on the network, however, we are actually only seeing very little traffic. I would say only about 10-15 percent of the network devices and traffic. There are rough, 50 edge switches connected to the core with around 400 devices total. Is there a configuration I need to make on the edge switch to send all data up to the Core?
Are you trying to SPAN all the vlans on the core? If that is the case, than on the core, the source could be all the vlans and destination a separate port. Also, can you post the config from the core?
depends on where you span configured, if all the devices are connected to same Core switch, you can SPAN port on uplink port so you can have more visbility, i wish to see your exiting config and some information as you mentioned 10-15% traffic ?