You can download custom MIB files for most popular vendors (Cisco, Juniper, ...) that allow you to talk SNMP to their device. In most cases, your commands will end up like this. then copy mib file to cd /usr/share/snmp/mibs/ locaton with extension of .my or .txt anything is fine. snmpwalk -v 2c -c community -m CISCO-UNIFIED-COMPUTING-MEMORY-MIB 192.168.1.1 if the new data is coming that means the mibs are working fine. to auto load in snmpwalk do below create a new file as /etc/snmp/snmp.conf add below lines in the file mibs +CISCO-UNIFIED-COMPUTING-MEMORY-MIB then restart the snmp in the client server.