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MIB Reference

AR100-S, AR110-S, AR120-S, AR150-S, AR160-S, AR200-S, AR1200-S, AR2200-S, and AR3200-S V200R009

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SNMP Packet Operation Process

SNMP Packet Operation Process

The agent on the managed node receives a request packet from the NMS through UDP port 161.

The agent treats the received packet as follows:

  1. Decoding the packet based on basic encoding rules of Abstract Syntax Notation One (ASN.1) and representing it in an internal data structure

    The agent discards the packet if some errors cause the decoding failure.

  2. Checking the SNMP version number contained in the packet

    The agent fetches the version number from the packet and compares it with the version that it supports. If they are inconsistent, the agent discards the packet.

  3. Checking the community name contained in the packet

    The community name is inserted by the NMS. If the community name is not the supported one, the agent discards the packet. A trap packet is returned to the NMS at the same time. SNMPv1 provides weak security measures, which are enhanced in SNMPv3.

  4. Fetching the PDU from the authenticated ASN.1 object

    If the operation fails, the agent discards the packet.

  5. Handling the PDU. The agent handles the PDU according to its type. It searches the MIB to find the MO matching the variable, and then obtains the value of the variable from the module. After that, the agent generates the response packet, encodes it and returns it to the NMS.

  6. The NMS performs the same operations as the agent, and displays the final result.

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Updated: 2019-07-19

Document ID: EDOC1000174090

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