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 ASN.1 and representing it in an internal data structure

2. Checking the SNMP version number contained in the packet

3. Checking the community name contained in the packet

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

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.

For SNMP configuration, see HUAWEI NetEngine 8000 F Series Router Configuration Guide - System Management.