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MIB Reference

TE30, TE40, TE50, TE60, TX50, RP100, and RP200 V600R019C00

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SNMP Packet Processing

SNMP Packet Processing

An agent receives requests from the NMS through UDP port 161.

The agent processes a received packet as follows:

  1. Decodes the packet. Based on ASN.1 encoding rules, the agent generates a packet that is represented in the internal data structure. The agent discards the packet if the decoding fails due to any errors.
  2. Checks the SNMP version. The agent compares the SNMP version in the received packet with the list of supported versions. If the version is not included in the list, the agent discards the packet.
  3. Checks the community name. The community name in the packet is inserted by the NMS that sends the packet. If the community name is not the supported by the managed node where the agent resides, 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. Obtains the SNMP PDU from the authenticated ASN.1 object. If the operation fails, the agent discards the packet.
  5. Handles the PDU. The agent handles the PDU according to its SNMP entity. The agent searches the MIB tree for the node matching the variable to be managed and obtains the variable value from the corresponding module. Then, the agent generates the response packet, encodes the packet, and sends the encoded response to the NMS.
  6. The NMS performs similar operations as the agent and displays the final result.

For details about SNMP configuration, see section "CLI-based Configuration > Configuration Guide - Network Management" in the S9300&S9300E User Manual.

Updated: 2019-05-31

Document ID: EDOC1100057237

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