haii,I have three switches in my network, I configure the vlans in cisco ws 3850 and i tagged these all vlans in to other two switches is cisco sg 500,The uplink was connected from the each port of cisco ws 3850 to other 2 switches, The network is pe...

dear team,    in my cisco  WS-C3850-24XS  switch when i connect the sfp module sfp-10g-sr in both end at that  time the interface shows its connected but the link is not up why?