Cisco 878 Router Physical Layer troubleshooting
**My problem:**

Upon connecting the FastEthernet0 with a straight-through cable to a Catalyst switch, the line protocol comes up briefly and then goes down. Interface goes down too, I now have this on my show ip int brief:

    Interface                  IP-Address      OK? Method Status                Protocol
    FastEthernet0              unassigned      YES unset  down                  down 
I hereby state that the physical connection is down, and that there must be a problem with the ports or cabling.

**Tried solutions:**
    
    Use a different cable
    Use a different switch
    Use a different port
    Check Duplex settings and port speed

The problem persists, so I don't understand where the problem could lie, is it maybe port security on the switch? (I have no access to the switch, I'm doing this remotely)

Does anybody know the solution?

Thank you in advance.
Cisco 878 Router Physical Layer troubleshooting
===

**My problem:**

Upon connecting the FastEthernet0 with a straight-through cable to a Catalyst switch, the line protocol comes up briefly and then goes down. Interface goes down too, I now have this on my show ip int brief:

    Interface                  IP-Address      OK? Method Status                Protocol
    FastEthernet0              unassigned      YES unset  down                  down 
I hereby state that the physical connection is down, and that there must be a problem with the ports or cabling.

**Tried solutions:**
    
    Use a different cable
    Use a different switch
    Use a different port
    Check Duplex settings and port speed

The problem persists, so I don't understand where the problem could lie, is it maybe port security on the switch? (I have no access to the switch, I'm doing this remotely)

Does anybody know the solution?

Thank you in advance.