What is Master Agent and Sub Agent?
Sub agent: The agents which are not directly exposed to the manager are called sub-agents. Master agent: The agent which acts as a proxy/interface for sub agent(s) is called master agent. It contains the details about sub agents and acts as a interface between the manager and sub agent. When SNMP requests intended for sub agents reaches the master agent, the master agent will forward those requests to the sub-agent and the responses from the sub agents will be sent back to the manager.