What are errorIndication, errorStatus and errorIndex providing in PySNMP's nextCmd()?

Question

I would like to create proper error handling for the PySNMP function nextCmd() and am curious what the parameters errorIndication, errorStatus, and errorIndex are providing as I iterate through nextCmd().

I can not find anything within the documentation regarding these variables and would like to know more.

Because the actual documentation of such is SNMP standard, http://www.tcpipguide.com/free/t_SNMPVersion2SNMPv2MessageFormats-5.htm — Lex Li, Feb 21 '19 at 16:46

score 2 · Accepted Answer · answered Feb 21 '19 at 19:29

You can think of errorIndication as locally occurred errors. Misconfiguration or timeout will be reported via it.

The errorStatus and errorIndex pair can only come from the remote SNMP entity - that's the way how SNMP peers communicate their failures to us. Any non-zero errorStatus means an (enumerated) error. The accompanying errorIndex point to the first variable-binding in the request which might have caused the processing error being reported.

What are errorIndication, errorStatus and errorIndex providing in PySNMP's nextCmd()?

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