HCNUM-TC

Defines textual conventions (CounterBasedGauge64 and ZeroBasedCounter64) for representing high-capacity 64-bit numeric data types not natively supported by SMIv2.

HCNUM-TC is an IETF standards module that defines textual conventions for high-capacity numeric types -- specifically CounterBasedGauge64 and ZeroBasedCounter64 -- needed to represent large 64-bit counters and gauges that were not natively available in SMIv2. It is a foundational, vendor-neutral definitions module rather than one tied to a technology area, and it is used across many other MIBs (particularly high-speed interface and performance MIBs) that need 64-bit counting semantics. The module itself exposes no polling targets -- no interfaces, environment sensors, or fault conditions -- so it cannot reveal hardware or software status on its own. Its explicit purpose is as a shared dependency: any MIB tracking high-speed interface octets, packet counts, or other high-capacity gauges imports these conventions to avoid 32-bit counter wraparound, which is why the HCNUM-TC OID list contains nothing but the two textual-convention definitions themselves. It is deployed implicitly wherever high-throughput interfaces (Gigabit Ethernet and above) are monitored via SNMP.

No sample runtime objects exist because HCNUM-TC defines only the CounterBasedGauge64 and ZeroBasedCounter64 textual conventions used as data types by other MIBs. An administrator would not poll this module directly; rather, an interface MIB using a 64-bit high-capacity counter (for example a high-speed interface octet counter) would be typed as CounterBasedGauge64, letting management tools avoid the wraparound problems of 32-bit counters on multi-gigabit links. This module is a supporting type-definitions dependency, not a monitoring target itself.

IETF MIB defining high-capacity (64-bit) textual conventions for counters and gauges (RFC 2856).