I am connected via zabbix to network devices e.g. Routers, FWs etc. via SNMP and we can monitor resources such as interfaces, CPUs etc.
Now I need to fetch the configuration file of these devices via the same protocol (SNMP). Can anyone help how to accomplish that!
I have found this article which shows that it is possible, but i don't know how to implement it
Che CISCO-CONFIG-COPY-MIB you linked shows how to implement a snmp+tftp implementation, but IMHO it's not the way to go.
Zabbix is a monitoring platform, not a network management: you should use a different solution.
You should use something like Rancid or a commercial solution like Solarwind.