While debugging a net-snmp issue a while back, I came across the following error:
error on subcontainer 'interface container' insert (-1)
These errors are caused by opensolaris bug
6640675
which causes all interfaces to be assigned an index value of 0 (this leads net-snmp to think there are duplicate interfaces). The fix was just integrated into Nevada, so hopefully the code will be back ported to Solaris 10.