....Port Settings, on the 3750G(port 2)...
(ALL the ports are set correctly, on all the switches)
Status: enable
Duplex: auto
speed: auto
PortFast: enable when static access
Flow ctrl: off
Auto MDIX: on
VLAN SETTINGS:
Administrative port: 802.1Q Trunk
trunk allowed VLAN:1,2,5,10,15,20.....
Pruning VLAN: 2-1001
Native VLAN: 1