1
The -Cu option tells the command to consult the old UCD-SNMP private MIB.
2
Many vendors have private MIBs that return the duplex state.
3
Netgear doesn't make its private MIB available.
4
Graph of Cisco private MIB objects
5
It supports only these routers because Cricket uses Cisco-specific private MIB objects to gather temperature, CPU information, and so on.