SNMP error code

tooBig (1) — error-status 1 — response would not fit

The agent's reply exceeds what it can encode in one PDU, usually because the request asked for too many variables at once.

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Diagnosis

When you hit this

A GETBULK with a large max-repetitions against a device with a small buffer.
Requesting many variables in one GET.
A device with an unusually small maximum message size.

Resolution

How to fix it

Lower max-repetitions
Reduce it until the response fits. Ten to twenty is safe on most embedded agents.
Split the request
Several small GETs are more reliable than one large one, especially against industrial gear.

Normalization

What Forge does about it

A request that fails on some points and succeeds on others still normalizes. The tags that arrived resolve to canonical fields as usual; the ones that did not come back are listed in unresolved_tags and excluded from coverage_pct, so a partial read reports as partial instead of quietly looking complete.