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Cisco Port blinking

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I have a Cisco 3750 fiber switch that is connected to a Cisco 3950 in another building. The port that is connected on the 3750 flashes green/amber while the one on the 3950 stays solid green. There is a media converter connected being used. Could that be the issue? The duplex and speed on the ports match.

There is a degradation of performance across the link. It's driving me crazy.

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