I want to fetch a device's cpu and memory status thought net-snmp. I get my device's info with this command:

snmpwalk -v 2c -c public 210.38.xxx.xxx system

And I got this info:

SNMPv2-MIB::sysDescr.0 = STRING: Ruijie High-density IPv6 10G Core Routing Switch(S8606) By Ruijie Network
SNMPv2-MIB::sysObjectID.0 = OID: SNMPv2-SMI::enterprises.4881.1.1.10.1.43
DISMAN-EVENT-MIB::sysUpTimeInstance = Timeticks: (1978814424) 229 days, 0:42:24.24
SNMPv2-MIB::sysContact.0 = STRING: 
SNMPv2-MIB::sysName.0 = STRING: S8606
SNMPv2-MIB::sysLocation.0 = STRING: 
SNMPv2-MIB::sysServices.0 = INTEGER: 7

Now I want to fetch the cpu status, and I search my question on Google, somebody offer a oid for query the cpu status:

snmpwalk -v 2c -c public 210.38.xxx.xxx usageOfCPU

But it doesn't worked :

No log handling enabled - using stderr logging
usageOfCPU: Unknown Object Identifier (Sub-id not found: (top) -> usageOfCPU)

Somebody told me some switch has its private MIB, and you can use it to see its CPU status, is that right?

I hope someone can solve me question......