Tracing Gigabit SFP Connections on Cisco

Hi,

I've inherited an environment of old Cisco gear (35xx series) with an 8-port Gigabit (SFP) core router connected to various other 35xx switches over fiber. Is there a way to identify which fiber port on the core is connected to which switch via the CLI? All I can seem to find is info on the local SFP, not any information on the remote SFP.

All help appreciated!