CISCO-TCP-METRICS-MIB

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Organization: Cisco Systems, Inc.

Last Updated: 2011-03-06

Category: Cisco Devices, IP and Core Protocols, Network Monitoring (RMON)

Description: Monitors TCP connection performance metrics including RTT, congestion window, and retransmission statistics on Cisco devices.

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What Is CISCO-TCP-METRICS-MIB?

CISCO-TCP-METRICS-MIB is a Cisco MIB that exposes quality metrics for TCP traffic flows as measured by a "flow monitor", a hardware or software entity that classifies traffic and periodically computes flow metrics over a defined measurement interval. It provides both a cumulative metrics table (cfmTcpMetricsTable) and an interval-based metrics table (cfmTcpMetricsIntTable), each carrying round-trip-time measurements along with scale/precision qualifiers and a validity flag. This MIB is squarely a performance-monitoring module: it lets an administrator assess network/application performance health by tracking TCP round-trip time and detecting when a measurement interval's data has changed (cfmTcpMetricsTableChanged), useful for spotting latency degradation or flow-monitor resets rather than hardware faults per se. It is a Cisco enterprise MIB but conceptually depends on general flow-monitoring/NetFlow-style concepts and standard SNMPv2-CONF/textual-convention frameworks for its notification and conformance groups. It is typically deployed on Cisco routers/switches with flow-monitoring or performance-monitoring features enabled, feeding an NMS that tracks WAN or application-path TCP quality. Network engineers evaluating or troubleshooting this functionality can download the CISCO-TCP-METRICS-MIB file directly to load it into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in CISCO-TCP-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 with flow-monitoring/performance-monitoring capability

Monitoring Examples

An administrator would poll cfmTcpMetricsTable/cfmTcpMetricsEntry, checking cfmTcpMetricsValid before reading cfmTcpMetricsRoundTripTime (scaled per cfmTcpMetricsRoundTripTimeScale and cfmTcpMetricsRoundTripTimePrecision), to track baseline RTT for a monitored TCP flow. Watching the parallel cfmTcpMetricsIntTable/cfmTcpMetricsIntEntry reveals RTT for the current measurement interval specifically, so a sudden spike there compared to the cumulative table would flag a recent latency degradation on that path. The ciscoTcpMetricsMIBNotifs notifications would fire to alert when such interval data changes significantly.

What Can Be Monitored

TCP round-trip time (cumulative and per-interval)
measurement validity flag
RTT scale/precision
metrics table change notifications

Imported Objects

From CISCO-FLOW-MONITOR-MIB

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

From CISCO-FLOW-MONITOR-TC-MIB

FlowMetricPrecision
FlowMetricScale
FlowMetricValue

From CISCO-SMI

ciscoMgmt

OBJECT-IDENTITY

From SNMPv2-CONF

MODULE-COMPLIANCE
OBJECT-GROUP

From SNMPv2-SMI

MODULE-IDENTITY
OBJECT-TYPE

From SNMPv2-TC

TimeStamp

OIDs

OID symbolic	OID numeric	Type	Access	Description
ciscoTcpMetricsMIB	1.3.6.1.4.1.9.9.770			This MIB module defines objects that describe the quality metrics of TCP streams. GLOSSARY ============ 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. 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. Traffic Flow Stream - when the monitor identifies multiple individual traffic flows based on the flow classificiation, the monitor aggregates the flows and represents them as a single entry in the cfmFlowTable. The individual traffic flows contributing to the metrics are called as individual traffic flow stream. The metrics for the traffic flow with multiple streams contributing, are determined either by aggregating metrics of all individual streams, for example, cumulative bit rate is computed by cumulative bits of all streams divided by total duration, or by selecting the metric for one of the individual stream, for example, maximum bit rate of an individual stream.
ciscoTcpMetricsMIBNotifs	1.3.6.1.4.1.9.9.770.0
ciscoTcpMetricsMIBObjects	1.3.6.1.4.1.9.9.770.1
cfmTcpMetrics	1.3.6.1.4.1.9.9.770.1.1
cfmTcpMetricsTable	1.3.6.1.4.1.9.9.770.1.1.1		not-accessible	This table contains aggregate data maintained by a flow monitor for traffic flows for which it is computing TCP 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 'tcp' bit set to one.
cfmTcpMetricsEntry	1.3.6.1.4.1.9.9.770.1.1.1.1		not-accessible	An entry describes cumulative and aggregate TCP metrics for a single traffic flow. The devices creates a row in the cfmTcpMetricsTable when a flow monitor starts monitoring a traffic flow and has been configured to compute TCP metrics for the same traffic flow. Likewise, the device destroys a row in the cfmTcpMetricsTable when the corresponding flow monitor has ceased monitoring the traffic flow (e.g., when a traffic flow has timed out).
BIT cfmTcpMetricsValid	1.3.6.1.4.1.9.9.770.1.1.1.1.1	Bits	read-only	This object indicates which metrics are valid for the traffic flow: 'roundTripTime' If this bit is set to '1', then the corresponding instances of cfmTcpMetricsRoundTripTimeScale, cfmTcpMetricsRoundTripTimePrecision, and cfmTcpMetricsRoundTripTime are valid.
FLO cfmTcpMetricsRoundTripTimeScale	1.3.6.1.4.1.9.9.770.1.1.1.1.2	FlowMetricScale	read-only	This object indicates the scaling factor for the corresponding instance of cfmTcpMetricsRoundTripTime.
FLO cfmTcpMetricsRoundTripTimePrecision	1.3.6.1.4.1.9.9.770.1.1.1.1.3	FlowMetricPrecision	read-only	This object indicates the precision for the corresponding instance of cfmFlowMetricsRoundTripTime.
FLO cfmTcpMetricsRoundTripTime	1.3.6.1.4.1.9.9.770.1.1.1.1.4	FlowMetricValue	read-only	This object indicates the round trip time for the packet observed by the flow monitor for the corresponding flow. The round trip time is defined as the length of time it takes for a TCP segment transmission and receipt of acknowledgement.
TIM cfmTcpMetricsTableChanged	1.3.6.1.4.1.9.9.770.1.1.2	TimeStamp	read-only	This object indicates the value of sysUpTime the last time the device created/destroyed a row in the cfmTcpMetricsTable.
cfmTcpMetricsIntTable	1.3.6.1.4.1.9.9.770.1.1.3		not-accessible	This table contains historic TCP 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 'tcp' bit set to one.
cfmTcpMetricsIntEntry	1.3.6.1.4.1.9.9.770.1.1.3.1		not-accessible	An entry describes TCP metrics collected for a previous measurement interval for a corresponding traffic flow.
BIT cfmTcpMetricsIntValid	1.3.6.1.4.1.9.9.770.1.1.3.1.1	Bits	read-only	This object indicates which metrics are valid for the measurement interval: 'roundTripTime' If this bit is set to '1', then the corresponding instances of cfmTcpMetricsIntRoundTripTimeScale, cfmTcpMetricsIntRoundTripTimePrecision, and cfmTcpMetricsIntRoundTripTime are valid.
FLO cfmTcpMetricsIntRoundTripTimeScale	1.3.6.1.4.1.9.9.770.1.1.3.1.2	FlowMetricScale	read-only	This object indicates the scaling factor for the corresponding instance of cfmTcpMetricsIntRoundTripTime.
FLO cfmTcpMetricsIntRoundTripTimePrecision	1.3.6.1.4.1.9.9.770.1.1.3.1.3	FlowMetricPrecision	read-only	This object indicates the precision for the corresponding instance of cfmFlowMetricsIntRoundTripTime.
FLO cfmTcpMetricsIntRoundTripTime	1.3.6.1.4.1.9.9.770.1.1.3.1.4	FlowMetricValue	read-only	This object indicates the round trip time for traffic flow during the measurement interval.
ciscoTcpMetricsMIBConform	1.3.6.1.4.1.9.9.770.2
ciscoTcpMetricsMIBCompliances	1.3.6.1.4.1.9.9.770.2.1
ciscoTcpMetricsMIBCompliance01	1.3.6.1.4.1.9.9.770.2.1.1			This compliance statement specifies the minimal requirements an implementation must meet in order to claim full compliance with the definition of the CISCO-TCP-METRICS-MIB.
ciscoTcpMetricsMIBGroups	1.3.6.1.4.1.9.9.770.2.2
ciscoTcpMetricsGroup	1.3.6.1.4.1.9.9.770.2.2.1			This group contains objects that describe TCP metrics.
ciscoTcpMetricsMIBIds	1.3.6.1.4.1.9.9.770.3

RFC description

Measures TCP stream quality metrics including flow rate, latency, and packet loss for Cisco flow monitoring systems.

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Download CISCO-TCP-METRICS-MIB

What Is CISCO-TCP-METRICS-MIB?

Supported Devices

Monitoring Examples

What Can Be Monitored

This MIB depends on

Related MIBs

RFC description