1. %PM-4-ERR_DISABLE: [char] error detected on [char]
This message indicates that this is a defensive measure that will put the interface in the errdisable state when it detects a misconfiguration or misbehavior. After the configured retry time (5 minutes by default), the system will attempt to recover the interface.
Recommended Action: Reset the VLAN assignments to remove the conflict.
1. %ETHCNTR-3-LOOP_BACK_DETECTED: Loop-back detected on [chars]. The port is forced to linkdown.
A loopback condition has been detected. This condition may be caused if a balun cable is accidentally plugged into the port.
Recommended Action: Check the cables. If a balun cable is connected and the loopback condition is desired, no action is required. Otherwise, connect the correct cable, and bring the port up by entering the no shutdown command in interface configuration mode
Thank you for errors explanations, but i sure these are not my causes.
Firstly, want to explain, that such problem is not only with my 3550 switches. I found such problem on one of cisco's dedicated forums, where a man wrote that he has problems with 3550 to Intel switch connection.
Also i tried different combinations and the problem apears again and again.
Secondly, i dont do any difficult configs or VLAN games with them. And as i mentioned before i cheked all cables and i used different cables, and our SCS engineers make good cables...
See bug CSCdt82690. Your situation sounds very similar to one I had with an EtherChannel connection. At the request of the TAC Engineer, I ended up disabling keepalives on all physical and EtherChannel interfaces on all 3550s.
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