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Port Disable for traffic flowing only one direction


We use some Catalyst Express 500 and ESW-520 in our company.

But with the Catalyst Express 500 we have problem that we can't arrive to explain.

Some Gi port turn disable with this log error message :

Description: Gi1: This port is disabled because the traffic is flowing only in one direction. The cause might be incorrect cabling.

Recommendation: Make sure that cable is properly connected to the ports. For fiber connections, ensure that the transmit and receive fibers are connected correctly. Disable and Enable the port.


For the recommandation the cable is right, we change it and we change the switch by an other and the probleme continue.
If we change with a ESW-520 the problem don't arrive, but we can't change all our old switch for moment.

Any idea about this problem?