I have an access Catalyst 3524 switch uplink trhough Fiber to backbone Catalyst 6509 switch. The uplinks ports are LX-GBICs adaptors. The distance I believe would be about 2200 feet. The link ports on 3524 and 6509 are green and in up/up mode. I can also see the devices in CDP Neighbor commands, but I can't ping anything from 3524 to 6509. Could it be a distance that doesn't allow layer 3 traffic to pass through eventhough I can see the devices in CDP as layer 2. Thanks, Teza
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