I need to connect two 3750G together. Right now I have one FastEthernet connected to another FastEthernet on the ohter 3750 and one GigE to a GigE on the other 3750. Spanning-tree is doing its job and blocking an interface. Both interfaces are in the same vlan. I have turned on errdisable recovery cause all with interval of 30 but all that does it bring up the errdisable interface after spanning tree shuts it down. This happens every 30 seconds. I have to use this design so I need to such trick spanning tree. How do I do it?