Explanation This message means that a loopback condition might be the result of a balun cable incorrectly connected into a port. On PoE switches, this message might appear when a device that can be powered by either a PoE switch port or by AC power is not being powered by an external AC power source and is connected to a port that has been configured with the power inline never interface configuration command. [chars] is the port.
Recommended Action On non-PoE switches, 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 then enable the port up by entering the no shutdown interface configuration command. On PoE switches, remove the device or configure the port by entering the power inline auto, the shutdown, and the no shutdown interface configuration commands.
The mentioned 3550 switch is not having the PoE ports.
The port no fa 0/3 is connected to the L2 switch ( brand: HUAWUI) And one more thing i want to what is balun cable. presently we connected these two switches with ethernet cable.
After getting this error, if i give shut and no shut then this port comming up. but after some time later the error comming. let me know " the errdisable cause is loopback" why and how loopback. is it any looping kind of thing happening. for your information no other redudent links are there in between these switches.
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