Medianet Reference Guide - Cisco

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Cisco Network Analysis Module Chapter 6 Medianet Management and Visibility Design Considerations Figure 6-19 Detailed Graph of Multiple UDP Jitter IPSLA Operations Simulating a Cisco TelePresence CTS-1000 From Figure 6-19, it appears that UDP jitter IPSLA operations #1 and #2 space their packets each 1 millisecond apart. However, this is just because of the graphing of the data points. The actual data trace reveals that the Cisco Catalyst 6500 switch sends packets from both UDP jitter IPSLA operations roughly back-to-back every four milliseconds. Therefore, the IPSLA-simulated video packets are slightly more clumped together than actual TelePresence video packets, but still considered acceptable from a pre-assessment perspective. The third UDP jitter IPSLA operation generates a simulated audio stream of packets every 20 milliseconds. Note that a CTS-1000 can receive up to three audio streams and an additional auxiliary video stream for presentations. Simulation of these streams are not shown in this example for simplicity. However, the method discussed above can be extended to include those streams as well if needed. Likewise, the method may be used to simulate other video flows simply by capturing a data trace, analyzing the flow, and setting up the appropriate IPSLA operations. The configuration snippet on Example 6-3 shows the configuration of the UDP jitter IPSLA operations on the Cisco Catalyst 6500 switch that were used to create the simulation from which the data in Figure 6-19 was captured. Example 6-3 IPSLA Sender Configuration on a Cisco Catalyst 6500 Series Switch ip sla monitor 24 type jitter dest-ipaddr 10.24.1.11 dest-port 32800 source-ipaddr 10.16.1.1 source-port 32800 num-packets 16500 interval 2 request-data-size 1018 tos 128 ip sla monitor 25 type jitter dest-ipaddr 10.24.1.11 dest-port 32802 source-ipaddr 10.16.1.1 source-port 32802 num-packets 16500 interval 2 request-data-size 1018 tos 128 ip sla monitor 26 type jitter dest-ipaddr 10.24.1.11 dest-port 32804 source-ipaddr 10.16.1.1 source-port 32804 num-packets 3300 interval 20 6-28 Medianet Reference Guide OL-22201-01
Chapter 6 Medianet Management and Visibility Design Considerations Cisco Network Analysis Module request-data-size 183 tos 128 ! ip sla monitor group schedule 1 24,25,26 schedule-period 1 frequency 70 start-time now life 700 ! ~ Even though the packet interval has been configured at 2 milliseconds for ip sla monitor 25 and ipsla monitor 26, the real interval between packets was observed to be 4 milliseconds. Sending 16,500 packets spaced at 4 milliseconds apart takes approximately 66 seconds. The configuration of ip sla monitor group schedule 1 with a schedule period of one second causes the three UDP jitter operations to simultaneously start. The frequency of 70 seconds ensures that the previous operations complete before they begin again. The operation was set to run for approximately 10 intervals, or 700 seconds. Note that the length of time needed to perform a real assessment of a network to support a service such as a CTS-1000 is completely at the discretion of the network administrator. The aggregated output from the IPSLA tests can be displayed via the show ip sla monitor statistics aggregated details command on the Cisco Catalyst 6500 switch, as shown in Example 6-4. It shows the packet loss; minimum and maximum jitter; and minimum, maximum and average latency for each of the three UDP jitter IPSLA operations. Example 6-4 IPSLA Aggregated Statistics on a Cisco Catalyst 6500 Series Switch me-eastdc-1#show ip sla monitor statistics aggregated details Round trip time (RTT) Index 24 Start Time Index: .10:53:07.852 EST Mon Nov 16 2009 Type of operation: jitter Voice Scores: MinOfICPIF: 0 MaxOfICPIF: 0 MinOfMOS: 0 MaxOfMOS: 0 RTT Values Number Of RTT: 94674 RTT Min/Avg/Max: 1/1/7 Latency one-way time milliseconds Number of Latency one-way Samples: 0 Source to Destination Latency one way Min/Max: 0/0 Destination to Source Latency one way Min/Max: 0/0 Source to Destination Latency one way Sum/Sum2: 0/0 Destination to Source Latency one way Sum/Sum2: 0/0 Jitter time milliseconds Number of Jitter Samples: 94664 Source to Destination Jitter Min/Max: 1/4 Destination to Source Jitter Min/Max: 1/6 Source to destination positive jitter Min/Avg/Max: 1/1/4 Source to destination positive jitter Number/Sum/Sum2: 1781/1849/2011 Source to destination negative jitter Min/Avg/Max: 1/1/4 Source to destination negative jitter Number/Sum/Sum2: 1841/1913/2093 Destination to Source positive jitter Min/Avg/Max: 1/1/6 Destination to Source positive jitter Number/Sum/Sum2: 3512/3532/3632 Destination to Source negative jitter Min/Avg/Max: 1/1/6 Destination to Source negative jitter Number/Sum/Sum2: 3447/3468/3570 Interarrival jitterout: 0 Interarrival jitterin: 0 Packet Loss Values Loss Source to Destination: 0 Loss Destination to Source: 0 Out Of Sequence: 0 Tail Drop: 0 Packet Late Arrival: 0 Number of successes: 10 Number of failures: 0 Failed Operations due to over threshold: 0 Failed Operations due to Disconnect/TimeOut/Busy/No Connection: 0/0/0/0 Failed Operations due to Internal/Sequence/Verify Error: 0/0/0 Distribution Statistics: Bucket Range: 0-19 ms OL-22201-01 Medianet Reference Guide 6-29
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About the Authors Solution Authors
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Contents Application Intelligence a
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Contents The Globalization of the W
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Contents NetFlow Collector Consider
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Business Drivers for Media Applicat
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Business Drivers for Media Applicat
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Medianet Reference Guide - Cisco

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