SNMP Counter Types
RFC 2578 Section 7.1.6. Counter32
The Counter32 type represents a non-negative integer which monotonically increases until it reaches a maximum value of 2^32-1 (4294967295 decimal), when it wraps around and starts increasing again from zero.
Counters have no defined "initial" value, and thus, a single value of a Counter has (in general) no information content.
NOTE: Counters may increase by more than one