CISCO-CAR-MIB

All MIBs › CISCO-CAR-MIB

Category: Cisco Devices, Quality of Service, Textual Conventions and Registries

Description: Manages Committed Access Rate (CAR) QoS rate-limiting policies on Cisco router interfaces.

Start monitoring vendor-neutral, standards-based MIB, any SNMPv3-capable network device (SNMP engine identity/boot/clock status) with a free 30-day trial of IPNetwork Monitor. Import MIBs, browse SNMP OIDs, create custom SNMP monitors, configure alerts, and monitor any SNMP-enabled network device from a single console.

What Is CISCO-CAR-MIB?

CISCO-CAR-MIB manages Committed Access Rate (CAR), a Cisco QoS feature that rate-limits traffic on router interfaces based on configured thresholds and take conform/exceed actions. It exposes configuration objects defining rate limits, burst limits, and the actions to take when traffic conforms to or exceeds those limits, alongside a statistics table tracking actual traffic behavior against those policies. Its monitoring value is centered on traffic/performance data: administrators use it to confirm that rate-limiting policies are correctly enforcing bandwidth caps and to see how much traffic is being conformed, exceeded, or dropped, which is important for enforcing SLAs and preventing congestion. It is applied per-interface and per-direction, so it implicitly relies on IF-MIB interface indexing to identify where each rate limit policy is applied. It is deployed on Cisco routers at network edges where bandwidth policing or traffic shaping enforcement needs verification. Network engineers researching Cisco CAR (Committed Access Rate) traffic-policing configuration reference this MIB to confirm rate-limit and conform/exceed-action settings via SNMP.

IPNetwork Monitor allows you to monitor SNMP objects defined in CISCO-CAR-MIB. Use the built-in SNMP Monitoring Browser to explore available variables, view their current values and descriptions, and select the objects you want to monitor. You can then create SNMP monitors, configure thresholds, and receive alerts when monitored values change.

Supported Devices

Cisco router (interface-level QoS/traffic-policing device)

Monitoring Examples

An operator would inspect ccarConfigTable, keyed by interface and ccarConfigDirection/ccarConfigRowIndex, reading ccarConfigRate, ccarConfigLimit, ccarConfigConformAction, and ccarConfigExceedAction to confirm the configured policing policy. Correlating this with ccarStatTable reveals actual conform/exceed traffic counts; a high proportion of exceed-action hits relative to conform hits would indicate the configured ccarConfigRate is too low for legitimate traffic demand on that interface, prompting a policy adjustment.

What Can Be Monitored

configured rate limit and burst limit
conform action vs exceed action
traffic conforming to policy
traffic exceeding policy
per-interface, per-direction rate limit configuration

Imported Objects

From CISCO-SMI

ciscoMgmt

OBJECT-IDENTITY

From IF-MIB

ifIndex

OBJECT-TYPE

From RFC-1212

OBJECT-TYPE

From RFC1155-SMI

Counter
Gauge

OIDs

OID symbolic	OID numeric	Type	Access	Description
ciscoCarMIB	1.3.6.1.4.1.9.9.113
ciscoCarMIBObjects	1.3.6.1.4.1.9.9.113.1
ccarConfigs	1.3.6.1.4.1.9.9.113.1.1
ccarConfigTable	1.3.6.1.4.1.9.9.113.1.1.1		not-accessible	A table of rate limit configuration entries. Rate Limit is a method of traffic control. It allows a set of rate limits to be configured and applied to packets flowing into/out of an interface to regulate network traffic.
ccarConfigEntry	1.3.6.1.4.1.9.9.113.1.1.1.1		not-accessible	A collection of rate-limit configuration objects on this interface. Entries in the ccarConfigTable is created and deleted via the rate-limit command line interface.
PAC ccarConfigDirection	1.3.6.1.4.1.9.9.113.1.1.1.1.1	PacketSource	not-accessible	The data source for the Rate Limit object.
INT ccarConfigRowIndex	1.3.6.1.4.1.9.9.113.1.1.1.1.2	INTEGER	not-accessible	An arbitrary index for rate limit objects. It will increase as the list is traversed, but may skip.
RAT ccarConfigType	1.3.6.1.4.1.9.9.113.1.1.1.1.3	RateLimitType	read-only	The type of traffic rate-limited against.
INT ccarConfigAccIdx	1.3.6.1.4.1.9.9.113.1.1.1.1.4	INTEGER	read-only	The index to the access list if RateLimitType is either quickAcc or standardAcc.
INT ccarConfigRate	1.3.6.1.4.1.9.9.113.1.1.1.1.5	INTEGER	read-only	The comitted access rate. This is the sustained rate permitted by the rate limit.
INT ccarConfigLimit	1.3.6.1.4.1.9.9.113.1.1.1.1.6	INTEGER	read-only	The rate limit. The amout of traffic, in bytes, in excess of the committed access rate which will be instantaneously permitted by the rate limit.
INT ccarConfigExtLimit	1.3.6.1.4.1.9.9.113.1.1.1.1.7	INTEGER	read-only	The extended burst limit. The amount of traffic, in bytes, in excess of the burst limit which may be conditionnally permitted by the rate limit. The probability that the traffic is not permitted increases as the received burst increases. P(not permitted) = (BurstRate - ConfLimit) / (ConfLimitExt - ConfLimit).
RAT ccarConfigConformAction	1.3.6.1.4.1.9.9.113.1.1.1.1.8	RateLimitAction	read-only	Action to be taken when the traffic is within the Rate Limit.
RAT ccarConfigExceedAction	1.3.6.1.4.1.9.9.113.1.1.1.1.9	RateLimitAction	read-only	Action to be taken when the traffic exceeds the Rate Limit.
ccarStats	1.3.6.1.4.1.9.9.113.1.2
ccarStatTable	1.3.6.1.4.1.9.9.113.1.2.1		not-accessible	A table of rate limit status entries.
ccarStatEntry	1.3.6.1.4.1.9.9.113.1.2.1.1		not-accessible	A collection of rate-limit status objects on this interface. Entries are created and deleted via the rate-limit command line interface.
CTR ccarStatSwitchedPkts	1.3.6.1.4.1.9.9.113.1.2.1.1.1	Counter	read-only	The counter of packets permitted by this rate limit.
CTR ccarStatSwitchedBytes	1.3.6.1.4.1.9.9.113.1.2.1.1.2	Counter	read-only	The counter of bytes permitted by this interface.
CTR ccarStatFilteredPkts	1.3.6.1.4.1.9.9.113.1.2.1.1.3	Counter	read-only	The counter of packets which exceeded this rate limit.
CTR ccarStatFilteredBytes	1.3.6.1.4.1.9.9.113.1.2.1.1.4	Counter	read-only	The counter of bytes which exceeded this rate limit.
GAU ccarStatCurBurst	1.3.6.1.4.1.9.9.113.1.2.1.1.5	Gauge	read-only	The current received burst size.
CTR ccarStatSwitchedPktsOverflow	1.3.6.1.4.1.9.9.113.1.2.1.1.6	Counter	read-only	The high-word of the counter of packets permitted by this rate limit. NOTE: The object ccarStatSwitchedPkts contains the lower 32 bits of the switched packet counts. If the number of switched packets is larger than what can be stored in a 32 bit value, then the high word value is stored in this object. As such SNMP Manager applications should combine this object along with the ccarStatSwitchedPkts object to come up with the 64-bit value. SNMP v2c or v3 Manager can use the ccarStatHCSwitchedPkts object directly (which is a 64-bit object).
CTR ccarStatSwitchedBytesOverflow	1.3.6.1.4.1.9.9.113.1.2.1.1.7	Counter	read-only	The high-word of the counter of bytes permitted by this interface. NOTE: The object ccarStatSwitchedBytes contains the lower 32 bits of the switched byte counts. If the number of switched bytes is larger than what can be stored in a 32 bit value, then the high word value is stored in this object. As such SNMP Manager applications should combine this object along with the ccarStatSwitchedBytes object to come up with the 64-bit value. SNMP v2c or v3 Manager can use the ccarStatHCSwitchedBytes object directly (which is a 64-bit object).
CTR ccarStatFilteredPktsOverflow	1.3.6.1.4.1.9.9.113.1.2.1.1.8	Counter	read-only	The high-word of the counter of packets which exceeded this rate limit. NOTE: The object ccarStatFilteredPkts contains the lower 32 bits of the filtered packet counts. If the number of filtered packets is larger than what can be stored in a 32 bit value, then the high word value is stored in this object. As such SNMP Manager applications should combine this object along with the ccarStatFilteredPkts object to come up with the 64-bit value. SNMP v2c or v3 Manager can use the ccarStatHCFilteredPkts object directly (which is a 64-bit object).
CTR ccarStatFilteredBytesOverflow	1.3.6.1.4.1.9.9.113.1.2.1.1.9	Counter	read-only	The high-word of the counter of bytes which exceeded this rate limit. NOTE: The object ccarStatFilteredBytes contains the lower 32 bits of the filtered byte counts. If the number of filtered bytes is larger than what can be stored in a 32 bit value, then the high word value is stored in this object. As such SNMP Manager applications should combine this object along with the ccarStatFilteredBytes object to come up with the 64-bit value. SNMP v2c or v3 Manager can use the ccarStatHCFilteredBytes object directly (which is a 64-bit object).
CTR ccarStatHCSwitchedPkts	1.3.6.1.4.1.9.9.113.1.2.1.1.10	Counter	read-only	The counter of packets permitted by this rate limit. NOTE: This is a 64 bit (High Capacity) version of the ccarStatSwitchedPkts counter for use with SNMP v2c or v3 Managers
CTR ccarStatHCSwitchedBytes	1.3.6.1.4.1.9.9.113.1.2.1.1.11	Counter	read-only	The counter of bytes permitted by this interface. NOTE: This is a 64 bit (High Capacity) version of the ccarStatSwitchedBytes counter for use with SNMP v2c or v3 Managers
CTR ccarStatHCFilteredPkts	1.3.6.1.4.1.9.9.113.1.2.1.1.12	Counter	read-only	The counter of packets which exceeded this rate limit. NOTE: This is a 64 bit (High Capacity) version of the ccarStatFilteredPkts counter for use with SNMP v2c or v3 Managers
CTR ccarStatHCFilteredBytes	1.3.6.1.4.1.9.9.113.1.2.1.1.13	Counter	read-only	The counter of bytes which exceeded this rate limit. NOTE: This is a 64 bit (High Capacity) version of the ccarStatFilteredBytes counter for use with SNMP v2c or v3 Managers
ciscoCarMIBConformance	1.3.6.1.4.1.9.9.113.3
ciscoCarMIBCompliances	1.3.6.1.4.1.9.9.113.3.1
ciscoCarMIBCompliance	1.3.6.1.4.1.9.9.113.3.1.1
ciscoCarMIBComplianceHCCounters	1.3.6.1.4.1.9.9.113.3.1.2
ciscoCarMIBGroups	1.3.6.1.4.1.9.9.113.3.2
ciscoCarMIBGroup	1.3.6.1.4.1.9.9.113.3.2.1
ciscoCarMIBHCGroup	1.3.6.1.4.1.9.9.113.3.2.2

RFC description

Manages Committed Access Rate (CAR) traffic control, providing weighted rate-limiting and packet filtering statistics on interfaces.

Start monitoring Cisco router (Committed Access Rate QoS/traffic policing) with a free 30-day trial of IPNetwork Monitor. Import MIBs, browse SNMP OIDs, create custom SNMP monitors, configure alerts, and monitor any SNMP-enabled network device from a single console.

Download CISCO-CAR-MIB

What Is CISCO-CAR-MIB?

Supported Devices

Monitoring Examples

What Can Be Monitored

This MIB depends on

Related MIBs

RFC description