[Observium] SNMP MIB-Exclude

I want to exclude MIB for pCidrRouteTable && inetCidrRoute. But I am not able to find the file snmpd.conf

Please suggest.

#cd /etc/snmp/

root@observium /etc/snmp# ll

total 12

drwxr-xr-x 2 root root 4096 Sep 3 2015 ./

drwxr-xr-x 103 root root 4096 Apr 13 12:28 ../

-rw-r--r-- 1 root root 28 Sep 3 2015 snmp.conf

root@observium /etc/snmp#