CISCO-RTP-METRICS-MIB

This MIB module defines objects that describe the quality
        metrics of RTP streams, similar to those described by an RTCP
        Receiver Report packet [RFC3550].
        
        GLOSSARY
        ============
        
        Expected Packets - this value is formally defined as the
            extended last sequence number received less the initial
            sequence number received.
        
            An extended last sequence number is a 32-bit value, where
            the most significant 16-bit word indicates the number of
            sequence number cycles, and the least significant 16-bit
            word indicates the highest sequence number received.
        
        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.
        
        Inter-Arrival Jitter - an estimate of the statistical variance
            of the RTP data packet inter-arrival time.
        
            The inter-arrival jitter, J, is formally defined to be the
            mean deviation (smoothed absolute value) of the difference,
            D, in packet spacing at the flow monitor compared to the
            sender for a pair of packets.  This is equivalent to the
            difference in the relative transit time for two packets; the
            relative transit time is the difference between a packet's
            RTP timestamp and the device's clock at the time of arrival
            (measured in the same units):
        
                D(i,j) = (Rj - Ri) - (Sj - Si) = (Rj - Sj) - (Ri - Si)
        
            where Si is the RTP timestamp from packet i, and Ri is the
            time of arrival in RTP timestamp units for packet i.
        
            The inter-arrival jitter SHOULD be calculated continuously
            for each RTP data packet received from source SSRCn, using
            this equation to compute difference for each packet and the
            previous packet (in order of arrival, not necessarily in
            sequence).
        
                                |D(i-1,i)| - J(i-1)
                J(i) = J(i-1) + -------------------
                                         16
        
        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.
        
        Loss Distance - the difference between the sequence numbers
            delimiting the start of two consecutive loss intervals.
        
            Consider the following sequence of RTP data packets:
        
                111111 111222    2233   33333 444  444 5
                123456x890123xxxx8901xxx56789x123xx678x0
        
                      ^      ^       ^       ^   ^    ^
                      |      |       |       |   |    |
                     LI1    LI2     LI3     LI4 LI5  LI6
        
              Loss Interval | Loss Distance
             ===============+===============
                     1      |
                     2      |      7
                     3      |      8
                     4      |      8
                     5      |      4
                     6      |      5
        
        Loss Fraction - the fraction of RTP data packets from source
            SSRCn lost during a measurement interval, expressed as a
            fixed-point number:
        
                      Li
                Fi = ----
                      Ei
        
            where Fi is the loss fraction for measurement interval i,
            Li is the lost packets during measurement interval i, and
            Ei is the expected packets during measurement interval i.
        
            Observe that the number of packets lost includes packets
            that are late or duplicates, and hence this number can can
            have a theoretical theoretical value between negative
            infinity and one.
        
            The cumulative loss fraction is the fraction of RTP data
            packets from source SSRCn lost over the duration 
            monitoring the flow:
        
                       n
                      sum [Li]
                      i=1
                Fn = ----------
                       n
                      sum [Ei]
                      i=1
        
            where Fn is the cumulative loss fraction over n measurement
            intervals.
        
        Loss Interval - an interval in which consecutive packet losses
            were experienced.
        
            Consider the following sequence of RTP data packets:
        
                111111 111222    2233   33333 444  444 5
                123456x890123xxxx8901xxx56789x123xx678x0
        
                      ^      ^       ^       ^   ^    ^
                      |      |       |       |   |    |
                     LI1    LI2     LI3     LI4 LI5  LI6
        
            LI1 through LI6 indicate the start of loss intervals
            observed in this sequence.
        
        Loss Interval Duration - the number of packets lost in a loss
            interval.
        
            Consider the following sequence of RTP data packets:
        
                111111 111222    2233   33333 444  444 5
                123456x890123xxxx8901xxx56789x123xx678x0
        
                      ^      ^       ^       ^   ^    ^
                      |      |       |       |   |    |
                     LI1    LI2     LI3     LI4 LI5  LI6
        
             Loss Interval | Duration
            ===============+==========
                    1      |    1
                    2      |    4
                    3      |    3
                    4      |    1
                    5      |    2
                    6      |    1
        
        Lost Packets - this value is formally defined as the number of
            packets expected less the number of packets actually
            received, where the number of packets received includes
            those which are late or duplicates.
        
        SSRCn - the SSRC identifier of the source.
        
        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.
        
        Transit Time - the latency from the insertion into the network
            to the flow monitor.  This value can be computed by taking
            the difference between a packet's RTP timestamp and the
            device's clock at the time of arrival (measured in the same
            units).
        
        REFERENCES
        ==============
        
        [RFC3550]   H. Schlzrinne, S. Casner, R. Frederick, V. Jacobson,
                    'RTP: A Transport Protocol for Real-Time
                    Applications', RFC-3550, July 2003.

Imported Objects

cfmFlowMonitorId, cfmFlowId, cfmFlowMetricsIntNumberCISCO-FLOW-MONITOR-MIB
FlowMetricScale, FlowMetricPrecision, FlowMetricValueCISCO-FLOW-MONITOR-TC-MIB
ReportIntervalCountCISCO-REPORT-INTERVAL-TC-MIB
ciscoMgmtCISCO-SMI
MODULE-COMPLIANCE, OBJECT-GROUPSNMPv2-CONF
MODULE-IDENTITY, OBJECT-IDENTITY, OBJECT-TYPE, Counter64, Gauge32SNMPv2-SMI
TimeStampSNMPv2-TC
ciscoRtpMetricsMIB .1.3.6.1.4.1.9.9.703
ciscoRtpMetricsMIBNotifs .1.3.6.1.4.1.9.9.703.0
ciscoRtpMetricsMIBObjects .1.3.6.1.4.1.9.9.703.1
cfmRtpMetrics .1.3.6.1.4.1.9.9.703.1.1
cfmRtpMetricsTable .1.3.6.1.4.1.9.9.703.1.1.1
cfmRtpMetricsEntry .1.3.6.1.4.1.9.9.703.1.1.1.1
cfmRtpMetricsValid .1.3.6.1.4.1.9.9.703.1.1.1.1.1
cfmRtpMetricsAvgLD .1.3.6.1.4.1.9.9.703.1.1.1.1.10
cfmRtpMetricsAvgLossDistance .1.3.6.1.4.1.9.9.703.1.1.1.1.11
cfmRtpMetricsJitterScale .1.3.6.1.4.1.9.9.703.1.1.1.1.12
cfmRtpMetricsJitterPrecision .1.3.6.1.4.1.9.9.703.1.1.1.1.13
cfmRtpMetricsJitter .1.3.6.1.4.1.9.9.703.1.1.1.1.14
cfmRtpMetricsExpectedPkts .1.3.6.1.4.1.9.9.703.1.1.1.1.2
cfmRtpMetricsLostPkts .1.3.6.1.4.1.9.9.703.1.1.1.1.3
cfmRtpMetricsFracScale .1.3.6.1.4.1.9.9.703.1.1.1.1.4
cfmRtpMetricsFracPrecision .1.3.6.1.4.1.9.9.703.1.1.1.1.5
cfmRtpMetricsFrac .1.3.6.1.4.1.9.9.703.1.1.1.1.6
cfmRtpMetricsLIs .1.3.6.1.4.1.9.9.703.1.1.1.1.7
cfmRtpMetricsAvgLDScale .1.3.6.1.4.1.9.9.703.1.1.1.1.8
cfmRtpMetricsAvgLDPrecision .1.3.6.1.4.1.9.9.703.1.1.1.1.9
cfmRtpMetricsTableChanged .1.3.6.1.4.1.9.9.703.1.1.2
cfmRtpMetricsIntTable .1.3.6.1.4.1.9.9.703.1.1.3
cfmRtpMetricsIntEntry .1.3.6.1.4.1.9.9.703.1.1.3.1
cfmRtpMetricsIntValid .1.3.6.1.4.1.9.9.703.1.1.3.1.1
cfmRtpMetricsIntAvgLD .1.3.6.1.4.1.9.9.703.1.1.3.1.10
cfmRtpMetricsIntAvgLossDistance .1.3.6.1.4.1.9.9.703.1.1.3.1.11
cfmRtpMetricsIntJitterScale .1.3.6.1.4.1.9.9.703.1.1.3.1.12
cfmRtpMetricsIntJitterPrecision .1.3.6.1.4.1.9.9.703.1.1.3.1.13
cfmRtpMetricsIntJitter .1.3.6.1.4.1.9.9.703.1.1.3.1.14
cfmRtpMetricsIntTransitScale .1.3.6.1.4.1.9.9.703.1.1.3.1.15
cfmRtpMetricsIntTransitPrecision .1.3.6.1.4.1.9.9.703.1.1.3.1.16
cfmRtpMetricsIntTransit .1.3.6.1.4.1.9.9.703.1.1.3.1.17
cfmRtpMetricsIntExpectedPkts .1.3.6.1.4.1.9.9.703.1.1.3.1.2
cfmRtpMetricsIntLostPkts .1.3.6.1.4.1.9.9.703.1.1.3.1.3
cfmRtpMetricsIntFracScale .1.3.6.1.4.1.9.9.703.1.1.3.1.4
cfmRtpMetricsIntFracPrecision .1.3.6.1.4.1.9.9.703.1.1.3.1.5
cfmRtpMetricsIntFrac .1.3.6.1.4.1.9.9.703.1.1.3.1.6
cfmRtpMetricsIntLIs .1.3.6.1.4.1.9.9.703.1.1.3.1.7
cfmRtpMetricsIntAvgLDScale .1.3.6.1.4.1.9.9.703.1.1.3.1.8
cfmRtpMetricsIntAvgLDPrecision .1.3.6.1.4.1.9.9.703.1.1.3.1.9
ciscoRtpMetricsMIBConform .1.3.6.1.4.1.9.9.703.2
ciscoRtpMetricsMIBCompliances .1.3.6.1.4.1.9.9.703.2.1
ciscoRtpMetricsMIBGroups .1.3.6.1.4.1.9.9.703.2.2
ciscoRtpMetricsMIBIds .1.3.6.1.4.1.9.9.703.3
cfmRtpMonitoredElements .1.3.6.1.4.1.9.9.703.3.1
cfmeRtpSsrcMismatch .1.3.6.1.4.1.9.9.703.3.1.1
cfmeRtpLossIntervals .1.3.6.1.4.1.9.9.703.3.1.10
cfmeRtpAvgLossDuration .1.3.6.1.4.1.9.9.703.3.1.11
cfmeRtpAvgLossDistance .1.3.6.1.4.1.9.9.703.3.1.12
cfmeRtpMaxJitter .1.3.6.1.4.1.9.9.703.3.1.13
cfmeRtpMaxMinTransit .1.3.6.1.4.1.9.9.703.3.1.14
cfmeRtpCumulativeLostPkts .1.3.6.1.4.1.9.9.703.3.1.2
cfmeRtpCumulativeLossFraction .1.3.6.1.4.1.9.9.703.3.1.3
cfmeRtpCumulativeLossIntervals .1.3.6.1.4.1.9.9.703.3.1.4
cfmeRtpCumulativeAvgLossDuration .1.3.6.1.4.1.9.9.703.3.1.5
cfmeRtpCumulativeAvgLossDistance .1.3.6.1.4.1.9.9.703.3.1.6
cfmeRtpCumulativeJitter .1.3.6.1.4.1.9.9.703.3.1.7
cfmeRtpLostPkts .1.3.6.1.4.1.9.9.703.3.1.8
cfmeRtpLossFraction .1.3.6.1.4.1.9.9.703.3.1.9