HP-CAR-MIB

Description: HP SNMP MIB for Committed Access Rate (CAR) traffic policing configuration and statistics on HP network devices.

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HP-CAR-MIB provides Committed Access Rate (CAR) traffic-policing configuration and statistics for HP network devices (the object prefix snPort suggests shared heritage with Foundry/Brocade-derived switch code later used in HP-branded switches). It exposes a per-port CAR table defining rate-limiting rules, including direction, rate, burst limits, and the conform/exceed action applied to traffic matching each rule. Its monitoring value is primarily configuration and traffic-shaping verification rather than raw hardware health: administrators check which rate-limiting policies are applied to which ports and can correlate CAR statistics with observed traffic drops or throttling. It depends on the standard IF-MIB ifIndex convention for identifying the port each CAR entry applies to. It is deployed on HP (Foundry/Brocade-lineage) network switches or routers where administrators need to enforce bandwidth caps or QoS policing on specific interfaces, making the HP-CAR-MIB MIB a standard reference for confirming those rate-limiting policies are applied as intended.

An administrator inspects snPortCARTable (snPortCAREntry, indexed by snPortCARifIndex and snPortCARRowIndex) to see the configured snPortCARDirection, snPortCARRate, and snPortCARLimit for a given port, confirming that a rate-limiting policy is applied as intended. The snPortCARConformAction object shows what happens to traffic within the configured rate (e.g. transmit) versus what would happen to non-conforming traffic. If users report unexpectedly throttled throughput on a port, checking snPortCARRate and snPortCARExtLimit against actual traffic volume would reveal whether CAR policing is the cause.

Manages Committed Access Rate traffic control and rate limiting on interfaces.