3750 & 3845 connectivity issue

[phamthecong]

hi All,

I have Cisco 3750 24 + 2SFP connects to cisc 3845 router using SFP ( both Cisco). The link is up and I can ping to the router. However when I reload the router, the SFP switch port is down. I need to enable switch port to bring it up.

Does anyone know what would be the cause?

thanks

[glen.grant]

I'll ask the simple question first , when you bring the switchport up you are doing a copy run start command correct ? If not the next time you reload the switchport will be in the down condition again.