Gabriel,
What type of issues are you having?
Could you start by checking the command
show port advertise port#
See if these are the results you are expecting.
You may even want to try the command to see if there is a neg issue.
clear port advertise ge.x.x
1000t Advertises 1000BASE-T half duplex mode.
1000tfd Advertises 1000BASE-T full duplex mode.
100tx Advertises 100BASE-TX half duplex mode.
100txfd Advertises 100BASE-TX full duplex mode.
10t Advertises 10BASE-T half duplex mode.
10tfd Advertises 10BASE-T full duplex mode.
pause Advertises PAUSE for full-duplex links.
Jason