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I'm trying to configure a fiber trunk between a Catalyst 3560 switch (Gi0/1) and Catalyst 3750 switch (Gi2/0/50). The SFP modules (GLC-SX-MM) are seated and the cables appear connected fine, but I get no green LED lights on either switch. Port setti...
Yes, the trunks are configured for dot1q encapsulation. I solved the problem by inverting the LC ends of the fiber patch cables. It needed to be TX --> RX, instead of TX-->TX. The green LED came up immediately after making this change.
