CISCO-IP-CBR-METRICS-MIB

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Organization: Cisco Systems, Inc.

Last Updated: 2009-06-11

Category: Cisco Devices, IP and Core Protocols, Quality of Service

Description: Monitors IP Constant Bit Rate performance metrics for real-time traffic quality assessment.

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What Is CISCO-IP-CBR-METRICS-MIB?

CISCO-IP-CBR-METRICS-MIB defines objects for measuring the quality of IP Constant Bit Rate (CBR) traffic flows, part of Cisco's flow-monitoring technology area focused on real-time media traffic such as voice and video. It exposes performance data including configured bit rate/packet size, packet loss counts, and Media Rate Variation (MRV)/Delay Factor metrics that quantify jitter-like flow-rate imbalance. It is used to monitor the software/performance status of real-time traffic flows on a device, letting an operator detect quality degradation such as rising lost-packet counts or an increasing Delay Factor that would translate into choppy voice or video for end users. It works closely with CISCO-FLOW-MONITOR-MIB, whose flow monitor entities reference these per-flow CBR quality metrics and raise alarms based on them. It is typically deployed on Cisco routers/switches carrying VoIP or video-conferencing traffic where QoS assurance is required. Engineers can download the CISCO-IP-CBR-METRICS-MIB file directly to load it into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in CISCO-IP-CBR-METRICS-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 routers and switches carrying real-time voice/video (CBR) traffic

Monitoring Examples

An operator would poll cfmIpCbrMetricsTable/cfmIpCbrMetricsEntry to check cfmIpCbrMetricsCfgBitRate and cfmIpCbrMetricsCfgMediaPktSize against the observed cfmIpCbrMetricsLostPkts and cfmIpCbrMetricsMrv (scaled/precision via cfmIpCbrMetricsMrvScale/cfmIpCbrMetricsMrvPrecision). A high or growing cfmIpCbrMetricsLostPkts combined with an elevated cfmIpCbrMetricsMrv value would indicate the CBR flow (e.g., a video stream) is experiencing packet loss and rate variation severe enough to degrade playback quality. cfmIpCbrMetricsTableChanged signals when new flow entries have appeared, prompting a re-poll.

What Can Be Monitored

configured bit rate
media packet size
lost packet count
media rate variation (jitter)
delay factor
flow metrics validity

Imported Objects

From CISCO-FLOW-MONITOR-MIB

cfmFlowId	OBJECT-TYPE
cfmFlowMetricsIntNumber	OBJECT-TYPE
cfmFlowMonitorId	OBJECT-TYPE

From CISCO-FLOW-MONITOR-TC-MIB

FlowBitRateUnits
FlowCfgRateType
FlowMetricPrecision
FlowMetricScale
FlowMetricValue

From CISCO-REPORT-INTERVAL-TC-MIB

ReportIntervalCount

From CISCO-SMI

ciscoMgmt

OBJECT-IDENTITY

From SNMPv2-CONF

MODULE-COMPLIANCE
OBJECT-GROUP

From SNMPv2-SMI

Counter64
MODULE-IDENTITY
OBJECT-IDENTITY
OBJECT-TYPE
Unsigned32

From SNMPv2-TC

TimeStamp

How to Use in IPNetwork Monitor

Example using cfmIpCbrMetricsLostPkts OID:

Select a Cisco routers and switches carrying real-time voice/video (CBR) as the target host to create a monitor — the SNMP service should be up and running on it. Click New Monitor, then check SNMP Custom on the Favorites tab, click Next, and confirm the host. On the next page, click Select... to open the built-in SNMP MIB Browser and type cfmIpCbrMetricsLostPkts into the Find box to locate it in the OID tree, selecting the specific row/instance you want to monitor since this is a table column, then select it and click OK. This object indicates the number of packets lost for the traffic flow. On the monitor's Main parameters page you can set the target's SNMP port (default 161), credentials, polling interval, and other settings — see the SNMP Monitor help for details. On the State conditions and Alerting tabs, configure when the monitor should change state and trigger an alert; since this is a Counter64-type OID, Value bounds is the most useful condition here — trigger an alert if the counter increases sharply between polls relative to its normal baseline (in packets), since an unexpected spike often reflects a real change in traffic or activity. Click Finish to create the monitor; you can adjust any parameter later.

OIDs

OID symbolic	OID numeric	Type	Access	Description
ciscoIpCbrMetricsMIB	1.3.6.1.4.1.9.9.697			This MIB module defines objects that describe the a set of metrics used to measure the quality of a IP CBR traffic flow. An IP CBR traffic flow consists of a stream of IP datagrams sent from one application to another with a constant packet rate or bit rate. GLOSSARY ============ CBR - Constant Bit Rate. Delay Factor - the maximum observed value of the flow rate imbalance over a measurement interval. DF - Delay Factor. Flow Monitor - a hardware or software entity that classifies traffic flows, collects flow data, and periodically computes flow metrics. Flow Metric - a measurement that reflects the quality of a traffic flow. Measurement Interval - the length of time over which a flow monitor collects data related to a traffic flow, after which the flow monitor computes flow metrics using the collected data. Media Rate - the effective bit rate of the media content carried by a traffic flow. Media Rate Variation - a measure of loss (in bytes): N RT - sum [Si] i=1 MRV = --------------- RT where R is the nominal media rate, T is the measurement interval, Si is the size of packet[i] received during the measurement interval, and N is the number of media packets received during the measurement interval. MR - Media Rate. MRV - Media Rate Variation. Traffic Flow - a unidirectional stream of packets conforming to a classifier. For example, packets having a particular source IP address, destination IP address, protocol type, source port number, and destination port number. VB - Virtual Buffer. Virtual Buffer - a virtual buffer is a construct used to simulate a real buffer used by a media application for the purpose of storing media packets until the the application can render their content.
ciscoIpCbrMetricsMIBNotifs	1.3.6.1.4.1.9.9.697.0
ciscoIpCbrMetricsMIBObjects	1.3.6.1.4.1.9.9.697.1
cfmIpCbrMetrics	1.3.6.1.4.1.9.9.697.1.1
cfmIpCbrMetricsTable	1.3.6.1.4.1.9.9.697.1.1.1		not-accessible	This table contains aggregate data maintained by a flow monitor for traffic flows for which it is computing IP CBR metrics. This table has an sparse dependent relationship on the cfmFlowMetricsTable (defined by the CISCO-FLOW-MONITOR-MIB), containing a row for each row in the cfmFlowMetricsTable having a corresponding instance of cfmFlowMetricsCollected with the 'ipCbr' bit set to one.
cfmIpCbrMetricsEntry	1.3.6.1.4.1.9.9.697.1.1.1.1		not-accessible	An entry describes cumulative and aggregate IP CBR metrics for a single traffic flow. The devices creates a row in the cfmIpCbrMetricsTable when a flow monitor starts monitoring a traffic flow and has been configured to compute IP CBR metrics for the same traffic flow. Likewise, the device destroys a row in the cfmIpCbrMetricsMetricsTable when the corresponding flow monitor has ceased monitoring the traffic flow (e.g., when a traffic flow has timed out).
FLO cfmIpCbrMetricsCfgRateType	1.3.6.1.4.1.9.9.697.1.1.1.1.1	FlowCfgRateType	read-only	This object indicates how the corresponding flow monitor computes the DF for the traffic flow.
FLO cfmIpCbrMetricsCfgBitRate	1.3.6.1.4.1.9.9.697.1.1.1.1.2	FlowBitRateUnits	read-only	This object indicates the units for the corresponding instance of cfmIpCbrMetricsCfgRate. The value of this column only has relevance if the corresponding instance of cfmIpCbrMetricsCfgRateType is 'ipBitRate' or 'mediaRate'.
U32 cfmIpCbrMetricsCfgRate	1.3.6.1.4.1.9.9.697.1.1.1.1.3	Unsigned32	read-only	This object indicates the configured bit rate used by the flow monitor to compute the DF for the traffic flow. The value of this column only has relevance if the corresponding instance of cfmIpCbrMetricsCfgRateType is 'ipBitRate' or 'mediaRate'.
U32 cfmIpCbrMetricsCfgMediaPktSize	1.3.6.1.4.1.9.9.697.1.1.1.1.4	Unsigned32	read-only	This object indicates the configured media packet size used by the flow monitor to compute the DF for the traffic flow. The value of this column only has relevance if the corresponding instance of cfmIpCbrMetricsCfgRateType is 'mediaRate'.
BIT cfmIpCbrMetricsValid	1.3.6.1.4.1.9.9.697.1.1.1.1.5	Bits	read-only	This object indicates which metrics are valid for the traffic flow: 'lostPkts' If this bit is set to '1', then the corresponding instance of cfmIpCbrMetricsLostPkts is valid. 'mediaRateVariation' If this bit is set to '1', then the corresponding instances of cfmIpCbrMetricsMlrScale, cfmIpCbrMetricsMlrPrecision, and cfmIpCbrMetricsMlr are valid.
C64 cfmIpCbrMetricsLostPktsEx	1.3.6.1.4.1.9.9.697.1.1.1.1.6	Counter64	read-only	This object indicates the number of packets lost for the traffic flow. The value of this column is valid if and only if the 'lostPkts' bit in the corresponding instance of cfmMdiMetricsValid is set to '1'.
FLO cfmIpCbrMetricsMrvScale	1.3.6.1.4.1.9.9.697.1.1.1.1.7	FlowMetricScale	read-only	This object indicates the scale factor for the corresponding instance of cfmIpCbrMetricsMrv. The value of this column is valid if and only if the 'mediaRateVariation' bit in the corresponding instance of cfmMdiMetricsValid is set to '1'.
FLO cfmIpCbrMetricsMrvPrecision	1.3.6.1.4.1.9.9.697.1.1.1.1.8	FlowMetricPrecision	read-only	This object indicates the precision for the corresponding instance of cfmIpCbrMetricsMrv. The value of this column is valid if and only if the 'mediaRateVariation' bit in the corresponding instance of cfmMdiMetricsValid is set to '1'.
FLO cfmIpCbrMetricsMrv	1.3.6.1.4.1.9.9.697.1.1.1.1.9	FlowMetricValue	read-only	This object indicates the MRV for the traffic flow since the flow monitor started collecting data for the traffic flow. The value of this column is valid if and only if the 'mediaRateVariation' bit in the corresponding instance of cfmMdiMetricsValid is set to '1'.
TIM cfmIpCbrMetricsTableChanged	1.3.6.1.4.1.9.9.697.1.1.2	TimeStamp	read-only	This object indicates the value of sysUpTime the last time the device created/destroyed a row in the cfmIpCbrMetricsTable.
cfmIpCbrMetricsIntTable	1.3.6.1.4.1.9.9.697.1.1.3		not-accessible	This table contains historic IP CBR metrics for the traffic flows monitored by each of the flow monitors supported by the device. This table has an sparse dependent relationship on the cfmFlowMetricsIntTable (defined by the CISCO-FLOW-MONITOR-MIB), containing a row for each row in the cfmFlowMetricsIntTable having a corresponding instance of cfmFlowMetricsCollected with the 'ipCbr' bit set to one.
cfmIpCbrMetricsIntEntry	1.3.6.1.4.1.9.9.697.1.1.3.1		not-accessible	An entry describes IP CBR metrics collected for a previous measurement interval for a corresponding traffic flow.
BIT cfmIpCbrMetricsIntValid	1.3.6.1.4.1.9.9.697.1.1.3.1.1	Bits	read-only	This object indicates which metrics are valid for the measurement interval: 'lostPkts' If this bit is set to '1', then the corresponding instance of cfmIpCbrMetricsIntLostPkts is valid. 'vbMin' If this bit is set to '1', then the corresponding instance of cfmIpCbrMetricsIntVbMin is valid. 'vbMax' If this bit is set to '1', then the corresponding instance of cfmIpCbrMetricsIntVbMax is valid. 'mediaRate' If this bit is set to '1', then the corresponding instances of cfmIpCbrMetricsIntMrUnits and cfmIpCbrMetricsIntMr are valid. 'delayFactor' If this bit is set to '1', then the corresponding instances of cfmIpCbrMetricsIntDfScale, cfmIpCbrMetricsIntDfPrecision, and cfmIpCbrMetricsIntDf are valid. 'mediaRateVariation' If this bit is set to '1', then the corresponding instances of cfmIpCbrMetricsIntMrvScale, cfmIpCbrMetricsIntMrvPrecision, and cfmIpCbrMetricsIntMrv are valid.
NUM cfmIpCbrMetricsIntLostPkts	1.3.6.1.4.1.9.9.697.1.1.3.1.2	ReportIntervalCount	read-only	This object indicates the number of lost packets for the traffic flow during the measurement interval. The value of this column is valid if and only if the 'lostPkts' bit in the corresponding instance of cfmIpCbrMetricsIntValid is set to '1'.
NUM cfmIpCbrMetricsIntVbMin	1.3.6.1.4.1.9.9.697.1.1.3.1.3	ReportIntervalCount	read-only	This object indicates the minimum virtual buffer size computed for the traffic flow over the course of the measurement interval. The value of this column is valid if and only if the 'vbMin' bit in the corresponding instance of cfmIpCbrMetricsIntValid is set to '1'.
NUM cfmIpCbrMetricsIntVbMax	1.3.6.1.4.1.9.9.697.1.1.3.1.4	ReportIntervalCount	read-only	This object indicates the maximum virtual buffer size computed for the traffic flow over the course of the measurement interval. The value of this column is valid if and only if the 'vbMax' bit in the corresponding instance of cfmIpCbrMetricsIntValid is set to '1'.
FLO cfmIpCbrMetricsIntMrUnits	1.3.6.1.4.1.9.9.697.1.1.3.1.5	FlowBitRateUnits	read-only	This object indicates the units for the corresponding instance of cfmIpCbrMetricsMr. The value of this column is valid if and only if the 'mediaRate' bit in the corresponding instance of cfmIpCbrMetricsIntValid is set to '1'.
NUM cfmIpCbrMetricsIntMr	1.3.6.1.4.1.9.9.697.1.1.3.1.6	ReportIntervalCount	read-only	This object indicates the media rate used by the flow monitor to compute the DF for the traffic flow. If the corresponding instance of cfmIpCbrMetricsCfgRateType is 'auto', then the value of this column indicates the MR for the traffic flow during the measurement interval. Otherwise, the value of this column reflects the configured MR. The value of this column is valid if and only if the 'mediaRate' bit in the corresponding instance of cfmIpCbrMetricsIntValid is set to '1'.
FLO cfmIpCbrMetricsIntDfScale	1.3.6.1.4.1.9.9.697.1.1.3.1.7	FlowMetricScale	read-only	This object indicates the scaling factor for the corresponding instance of cfmIpCbrMetricsIntDf. The value of this column is valid if and only if the 'delayFactor' bit in the corresponding instance of cfmIpCbrMetricsIntValid is set to '1'.
FLO cfmIpCbrMetricsIntDfPrecision	1.3.6.1.4.1.9.9.697.1.1.3.1.8	FlowMetricPrecision	read-only	This object indicates the precision for the corresponding instance of cfmIpCbrMetricsIntDf. The value of this column is valid if and only if the 'delayFactor' bit in the corresponding instance of cfmIpCbrMetricsIntValid is set to '1'.
FLO cfmIpCbrMetricsIntDf	1.3.6.1.4.1.9.9.697.1.1.3.1.9	FlowMetricValue	read-only	This object indicates the DF for the traffic flow during the measurement interval. The value of this column is valid if and only if the 'delayFactor' bit in the corresponding instance of cfmIpCbrMetricsIntValid is set to '1'.
FLO cfmIpCbrMetricsIntMrvScale	1.3.6.1.4.1.9.9.697.1.1.3.1.10	FlowMetricScale	read-only	This object indicates the scaling factor for the corresponding instance of cfmIpCbrMetricsIntMrv. The value of this column is valid if and only if the 'mediaRateVariation' bit in the corresponding instance of cfmIpCbrMetricsIntValid is set to '1'.
FLO cfmIpCbrMetricsIntMrvPrecision	1.3.6.1.4.1.9.9.697.1.1.3.1.11	FlowMetricPrecision	read-only	This object indicates the precision for for the corresponding instance of cfmIpCbrMetricsIntMrv. The value of this column is valid if and only if the 'mediaRateVariation' bit in the corresponding instance of cfmIpCbrMetricsIntValid is set to '1'.
FLO cfmIpCbrMetricsIntMrv	1.3.6.1.4.1.9.9.697.1.1.3.1.12	FlowMetricValue	read-only	This object indicates the MRV for the traffic flow during the measurement interval. The value of this column is valid if and only if the 'mediaRateVariation' bit in the corresponding instance of cfmIpCbrMetricsIntValid is set to '1'.
ciscoIpCbrMetricsMIBConform	1.3.6.1.4.1.9.9.697.2
ciscoIpCbrMetricsMIBCompliances	1.3.6.1.4.1.9.9.697.2.1
ciscoIpCbrMetricsCompliance01	1.3.6.1.4.1.9.9.697.2.1.1			This compliance statement specifies the minimal requirements an implementation must meet in order to claim full compliance with the definition of the CISCO-IP-CBR-METRICS-MIB.
ciscoIpCbrMetricsMIBGroups	1.3.6.1.4.1.9.9.697.2.2
cfmIpCbrMetricsGroup	1.3.6.1.4.1.9.9.697.2.2.1			This group contains objects that describe IP CBR metrics.
ciscoIpCbrMetricsMIBIds	1.3.6.1.4.1.9.9.697.3
cfmIpCbrMonitoredElements	1.3.6.1.4.1.9.9.697.3.1
cfmeIpCbrCumulativeLostPkts	1.3.6.1.4.1.9.9.697.3.1.1			This object identifier represents the monitored element describing the cumulative number of lost packets for a traffic flow (cfmIpCbrMetricsLostPkts). This obect identifier can be used as a value for cfmConditionMonitoredElement.
cfmeIpCbrCumulativeMrv	1.3.6.1.4.1.9.9.697.3.1.2			This object identifier represents the monitored element describing the cumulative MRV for a traffic flow (cfmIpCbrMetricsMrv). This obect identifier can be used as a value for cfmConditionMonitoredElement.
cfmeIpCbrLostPkts	1.3.6.1.4.1.9.9.697.3.1.3			This object identifier represents the monitored element describing the number of packets lost for a traffic flow during the last measurement interval (cfmIpCbrMetricsIntLostPkts). This obect identifier can be used as a value for cfmConditionMonitoredElement.
cfmeIpCbrDf	1.3.6.1.4.1.9.9.697.3.1.4			This object identifier represents the monitored element describing the DF for a traffic flow during the last measurement interval (cfmIpCbrMetricsIntDf). This obect identifier can be used as a value for cfmConditionMonitoredElement.
cfmeIpCbrMrv	1.3.6.1.4.1.9.9.697.3.1.5			This object identifier represents the monitored element describing the MRV for a traffic flow during the last measurement interval (cfmIpCbrMetricsIntMrv). This obect identifier can be used as a value for cfmConditionMonitoredElement.

RFC description

IP CBR (Constant Bit Rate) traffic flow quality metrics for Cisco flow monitoring systems.

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Download CISCO-IP-CBR-METRICS-MIB