We currently have a Catalyst 3560G connected to a Catalyst 3750G via GBICs, and the connection will go up, and then a few seconds later it will go down. If the GBICs are reseated, the connection will go back up, but then go back down a few seconds later. The 3750G is connected to two other Catalyst switches via GBICs, and those connections are without issue. We have tried both GBIC ports on the 3560G, the other free ports on the 3750G, as well as swapping the GBICs between the 3750G and the 3560G, but we end up with the same result of the connection dropping after a few seconds. I will try swapping the GBICs with know working GBICs when we can afford some downtime, but I wanted to see if there is anything that can be attempted in the meantime.
