The goal of this example is to monitor a G.729a VOIP call, to the specific 10.48.88.121 destination where the IP SLA Responder is configured (ip sla responder):
Router(config)# ip sla 1 Router(config-sla-monitorconfig-ip-sla)#type udp-jitter dest-ipaddr 10.48.88.121 dest-port 1648 codec g729a Router(config-ip-sla-jitter)# frequency 30 Router(config)# ip sla schedule 1 start-time now
The default settings of a 32-byte test packet size and an interpacket interval of 20 milliseconds are used in this example:
Router# show ip sla configuration 1 IP SLAs, Infrastructure Engine-II Entry number: 1 Owner: Tag: Type of operation to perform: jitter Target address: 10.48.88.121 Source address: 0.0.0.0 Target port: 1648 Source port: 0 Operation timeout (milliseconds): 5000 Codec Type: g729a Codec Number Of Packets: 1000 Codec Packet Size: 32 Codec Interval (milliseconds): 20 Advantage Factor: 0 Type Of Service parameters: 0x0 Verify data: No Vrf Name: Control Packets: enabled Operation frequency (seconds): 30 Next Scheduled Start Time: Start Time already passed Group Scheduled : FALSE Life (seconds): 3600 Entry Ageout (seconds): never Recurring (Starting Everyday): FALSE Status of entry (SNMP RowStatus): Active Threshold (milliseconds): 5000 Number of statistic hours kept: 2 Number of statistic distribution buckets kept: 1 Statistic distribution interval (milliseconds): 20 Enhanced History: Router# show ip sla statistics details 1 Entry number: 1 Modification time: 08:57:19.702 CET Mon Jul 11 2005 Number of Octets Used by this Entry: 14896 Number of operations attempted: 61 Number of operations skipped: 1 Current seconds left in Life: 1759 Operational state of entry: Active Last time this entry was reset: Never Connection loss occurred: FALSE Timeout occurred: FALSE Over thresholds occurred: FALSE Latest RTT (milliseconds): 2 Latest operation start time: 09:27:19.709 CET Mon Jul 11 2005 Latest operation return code: OK Voice Scores: ICPIF Value: 11 MOS score: 4.06 RTT Values (milliseconds): NumOfRTT: 992 RTTAvg: 2 RTTMin: 1 RTTMax: 5 RTTSum: 2761 RTTSum2: 8089 Packet Loss Values: PacketLossSD: 6 PacketLossDS: 2 PacketOutOfSequence: 0 PacketMIA: 0 PacketLateArrival: 0 InternalError: 0 Busies: 0 PacketSkipped: 0 Jitter Values (milliseconds): MinOfPositivesSD: 1 MaxOfPositivesSD: 2 NumOfPositivesSD: 192 SumOfPositivesSD: 194 Sum2PositivesSD: 198 MinOfNegativesSD: 1 MaxOfNegativesSD: 2 NumOfNegativesSD: 192 SumOfNegativesSD: 194 Sum2NegativesSD: 198 MinOfPositivesDS: 1 MaxOfPositivesDS: 2 NumOfPositivesDS: 233 SumOfPositivesDS: 256 Sum2PositivesDS: 302 MinOfNegativesDS: 1 MaxOfNegativesDS: 2 NumOfNegativesDS: 237 SumOfNegativesDS: 256 Sum2NegativesDS: 294 Jitter Avg: 1 JitterSD Avg: 1 JitterDS Avg: 1 Interarrival jitterout: 0 Interarrival jitterin: 0 One Way Values (milliseconds): NumOfOW: 992 OWMinSD: 1 OWMaxSD: 3 OWSumSD: 1749 OWSum2SD: 3289 OWMinDS: 0 OWMaxDS: 3 OWSumDS: 1012 OWSum2DS: 1354 OWAvgSD: 1 OWAvgDS: 1
The convention in this output is that a term containing SD implies a direction from source to destination, and a term with DS implies the reverse direction. The output of this show command might not be intuitive; however, it is verbose. It contains the MOS score 4.06, the ICPIF value 11, the minimum/maximum/average RTT, the packet loss in each direction, the out-of-sequence packets, the Missing In Action packet (packetMIA), a lot of statistical jitter, and one-way values for both directions.
A new command, show ip sla statistics, and its variant, show ip sla statistics detail, have been introduced in the latest IOS version. The advantage is clear visualization of the most important parameters. That means the minimum/average/maximum values of the round-trip time, one-way delay, jitter, packet loss for both directions, and the MOS and ICPIF scores:
Router# show ip sla statistics 1 Round trip time (RTT) Index 1 Latest RTT: 1ms Latest operation start time: *16:21:32.539 PST Wed Sep 27 2006 Latest operation return code: OK Over thresholds occurred: FALSE RTT Values Number Of RTT: 6253 RTT Min/Avg/Max: 1/1/2 ms Latency one-way time milliseconds Number of one-way Samples: 0 Source to Destination one way Min/Avg/Max: 0/0/0 ms Destination to Source one way Min/Avg/Max: 0/0/0 ms Jitter time milliseconds Number of Jitter Samples: 6253 Source to Destination Jitter Min/Avg/Max: 1/1/1 ms Destination to Source Jitter Min/Avg/Max: 1/1/1 ms Packet Loss Values Loss Source to Destination: 0 Loss Destination to Source: 0 Out Of Sequence: 0 Tail Drop: 0 Packet Late Arrival: 0 Voice Score Values Calculated Planning Impairment Factor (ICPIF): 0 Mean Opinion Score (MOS): 0 Number of successes: 23 Number of failures: 0 Operation time to live: 3496 sec
The new ip sla statistics detail command displays an extended version of ip sla statistics, with statistical information such as sum and square sum of the different metrics.
Finally, note that the information can be retrieved via SNMP with the RTTMON-MIB.