This article in our series on the Simple Network Management Protocol (SNMP) examines the communication between managers and agents.
Basic serial telemetry protocols, like TBOS, are byte oriented with a single byte exchanged to communicate. Expanded serial telemetry protocols, like TABS, are packet oriented with packets of bytes exchanged to communicate. The packets contain header, data and checksum bytes.
SNMP is also packet oriented with the following SNMP v1 packets (Protocol Data Units or PDUs) used to communicate:
The manager sends a Get or GetNext to read a variable or variables and the agent's response contains the requested information if managed. The manager sends a Set to change a variable or variables and the agent's response confirms the change if allowed.
The agent sends a Trap when a specific event occurs.
The image below shows the packet formats. Each variable binding contains an identifier, a type and a value (if a Set or response). The agent checks each identifier against its MIB to determine whether the object is managed and changeable (if processing a Set). The manager uses its MIB to display the readable name of the variable and sometimes interpret its value.
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More SNMP Tutorial Guides to Learn More:
SNMP Tutorial Part 1: The MIB, the manager, the agents.
SNMP Tutorial Part 2A: Understanding the MIB.
SNMP Tutorial Part 2B: Selecting a System
This guide is just one part of the first volume of the DPS Telecom white paper series on SNMP. After you're done reading, call one of our experts to discuss what you want to do with SNMP. Tell us what you're trying to accomplish, and we won't let you fail.
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