I have a potentially stupid question.
I have only worked with Cisco ASA 5505 appliances and SG/SF 300 series Cisco switches. Recently I picked up a Catalyst 3560CX 8 TC model switch, and have been having nothing but trouble trying to configure it.
On my bench I was able to assign ports 1-8 a basic 'switch' management IP of 192.168.0.253. Seemed to work fine. The PC I plugged into port 1 had no issues pinging it, connecting to it, allowing me to configure it.
I then took the unit onsite and plugged port 1 into a Cisco SG300 series switch.
The port light on the C3560CX went green, switched immediately to amber, and stayed solid amber. The switch port on the SG300 went dead as though nothing was connected. I disconnected the cable but the C3560CX still showed a solid amber light for that port. Just for fun I plugged the cable into port 3. Exactly the same outcome.
I checked the port on the SG300. I ensured it was set to Trunk. I turned off Auto SmartPort for the SG300 interface (GE30). No change.
Rebooted C3560CX and waited the 5 minutes for it to come backup - did exactly the same thing = dead amber port.
I disconnected the C3560CX, moved it to a PC, static assigned an IP to the PC, and hooked it up a switch port. Now I can ping 192.168.0.253 no problem. I can log into the web console no problem. Everything seems fine.
Everything is VLAN1 - default. Ports set to trunk.
Hook it back up to the network by uplinking to SG300 - dead port.
So I reconfigured the switch port to a routed port and set it to DHCP. Presumably this means the port will pull an address from the DHCP server on the network. Except I can't find it. The port no longer goes amber and dies, it's flashing, but it also seems to have no address that I can find.
I installed Cisco FindIT which using Bonjour does find the 4 SG300 series switches I have on the network, but doesn't find the C3560CX.
I figure since I have googled this to death and cannot find anything that even remotely looks like my issue, I must have done something stupid. I need to get this router up as it's required for a Fiber connection to a branch office. That's a whole other headache. First I need to be able to get this thing to talk to my other switches.