Media Path Analysis. Analyzing Media Paths Using IP SLA. Before You Begin. This section contains the following:
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1 This section contains the following: Analyzing Media Paths Using IP SLA, page 1 Analyzing Media Paths Using VSAA, page 3 Managing a Video Test Call, page 6 Analyzing Media Paths Using IP SLA To start a proactive troubleshooting workflow: Before You Begin You can use this feature only if you have enabled the Cisco IOS IP Service Level Agreements (SLAs) on your network devices. Cisco IOS IP SLA allow you to monitor network performance between Cisco devices (routers or switches). You must configure Cisco IOS IP SLAs Source and Responder in your network. You can verify whether the IPSLA responder feature is enabled on the device, using Prime Collaboration Assurance Device Work Center. To understand and deploy the IP SLA on your network devices, see the IP Service Level Agreements (IP SLAs) technology page on Cisco.com. Step 1 Step 2 Choose Operate > Diagnose > IP-SLA Diagnostics. Perform the following: a) Select the IP SLA source device from where you want to start the IP SLA testing. b) Select the IP SLA responder IP device, which is the IP SLA destination. c) Select the specific IP address of the responder IP device (applicable if your IP SLA destination device is configured with more than one IP address). d) Select the application for which you want to test the network performance. Note voice-service dsp-reservation <percentage> command must be configured on the router that acts as IP SLA initiator, to collect IP SLA statistics from the router. OL
2 IP SLA Test Result Step 3 e) Enter the IP SLA test life (in minutes). Click Start. IP SLA Test Result Based on the IP SLA Test Life (Minutes) value that you enter, the IP SLA tool will generate the traffic for that duration. The IP SLA Test Result display data for: Latest result Last time interval for which the operation was monitored. This depends on your configuration for frequency of monitoring on the device. Cisco IOS IP SLAs consumes CPU and memory. Most deployments use five-minute intervals, but some are one minute apart while others are 15 minutes apart. Last one hour aggregated result Aggregated result for the last one hour. Flow Statistics for only video flow path is displayed in the path topology, if the device is configured as a mediatrace responder. The IP SLA Test Result includes: Test Duration Time interval for which the packets were monitored in seconds. Number of Tests Run The number of times the IP SLA operation was run. This is based on the frequency of monitoring that you have configured on the device. One Way Latency Average, minimum, and maximum latency values. These values are measured by sending RTP packets to IP SLAs Responder. The RTP (Real-Time Transport Protocol) data stream is then looped back from the destination, to the source gateway. Packets Lost Number of packets lost. The source-to-destination value is measured by sending RTP packets to the IP SLAs Responder. No values are obtained from the digital signal processors (DSP) for this measurement. Inter-Packet Delay Variation (IPDV) (RFC 5481) Positive and Negative Jitter Average, minimum, and maximum jitter values as calculated in RFC Last Updated The time when the data was last updated. The IPSLA result also provides details on the path through the Path Assessment tab. You can view the proactive troubleshooting summary information for testable devices, nontestable device, mediatrace-enabled devices, devices with packet loss threshold violation, devices with jitter threshold violation, and devices with DSCP violation. A set of tests are run for the devices determined during proactive troubleshooting. To start the Path Assessment test, click Path Assessment Tests, after the proactive troubleshooting is complete for the session. For more information, see Path Assessment. 2 OL
3 Analyzing Media Paths Using VSAA If the troubleshooting IP SLA statistics is not available, Prime Collaboration supports application diagnostics to diagnose the issues and understand the root cause and recommendation. Figure 1: IPSLA Test Result Failure You must click Run Diagnostics. A message pops up stating the root cause and recommendation. After you run diagnostics, Prime Collaboration can diagnose if: The device supports IP SLA video operations. Prime Collaboration has CLI access to the device. IP SLA configuration is provisioned for the session running. The To device has IP SLA responder role configured. NTP clock is synchronized. The To device is reachable via the From device. voice-service dsp-reservation command is configured on the From device, if it is a router. Figure 2: IP SLA Diagnostics Root Cause and Recommendation Analyzing Media Paths Using VSAA To perform media path analysis: Before You Begin Prime Collaboration has the capability to facilitate the readiness assessment of a network to deploy Cisco Video or TelePresence systems. The Video SLA Assessment Agent (VSAA) is used in Prime Collaboration to provide network path characteristics (that is, latency, jitter, and packet loss) metrics before deploying or upgrading Cisco Video, TelePresence, or IP Video Surveillance (IPVS) systems and site extensions. The agent helps to determine network issues proactively, facilitating the expected rich quality and experience of Cisco TelePresence systems after its deployment. The benefits of the VSA Agent include accelerated Cisco OL
4 VSA Agent Assessment Results TelePresence systems deployment and reduction in effort and time through automation of the assessment process and reporting. Note If you have deployed Prime Collaboration in MSP mode, is not supported in a NAT environment. You can download the VSA Agent software from the Prime Collaboration software download site on Cisco.com. See Video SLA Assessment Agent 3.1 Installation Guide for the installation guidelines. Verify that the VSA Agent is up and running at the two endpoints, and synchronized to the NTP server. Step 1 Step 2 Step 3 Step 4 Choose Operate > Diagnose >. Enter the required assessment details. Enter the Table 1: Profile Details. Click Start. Table 1: Profile Details Field Profile Count DSCP Description Displays the profile settings you want to assess. RTP packets sent will be of based on the device type. Number of devices or streams you want to add to the network. You can add upto five devices. DSCP value indicates priority to traffic quality. The highest quality DSCP value is selected to ensure good quality video streaming. You must use CTS1000 profile to deploy CTS 500 and 1000 and CTS3000 profile to deploy CTS You can create, edit, and delete profiles. VSA Agent Assessment Results For the individual streams, you can view the topology (layer 2 and layer 3) for the selected direction between endpoints in the Troubleshooting tab. You can view the detailed troubleshooting workflow status for the top level and the individual streams using the Log tab. The Medianet Path View contains output from each mediatrace enabled device. The VSA Agent Assessment result also provides details on the path through the Path Assessment tab. You can view the troubleshooting summary information for testable devices, nontestable device, mediatrace-enabled devices, devices with packet loss threshold violation, devices with jitter threshold violation, and devices with DSCP violation. 4 OL
5 VSA Agent Assessment Results A set of tests are run for the devices determined during troubleshooting. To start the Path Assessment test, click Path Assessment Tests, after the proactive troubleshooting is complete for the session. For more information, see Path Assessment. The Test Result tab displays the following charts. For these charts, only the results of last twenty tests are displayed. Test Summary Figure 3: Test Summary Peak-to-Peak Jitter Figure 4: Peak-to-Peak Jitter Graph OL
6 Managing a Video Test Call Packets Lost Figure 5: Packets Lost Graph Latency Figure 6: Latency Graph Managing a Video Test Call You can create point-to-point video test calls between two video endpoints in managed state, to test your network. You can see events and alarms, session statistics, endpoint statistics, and network topology with medianet statistics like other calls. Only the CTS, C and EX series codecs are supported for this call. 6 OL
7 Managing a Video Test Call Note This feature is not supported for E20 codec series. To use this feature, CLI credentials must be added for the endpoints. Ensure that the endpoints are registered and JTAPI is enabled for endpoints (if they are registered to CUCM). The Video Test Call feature is not available if you have deployed Prime Collaboration in MSP mode. Table 2: Managing a Video Test call Task Start a video test call from Endpoint Diagnostics (Under Operate) Start a video test call from Session Diagnostics (Under Operate) Stop a running video test call Description Select the video endpoints, and click Video Test Call, to create a test call between two selected endpoints. Note This button gets enabled only after you have selected two video endpoints. or You cannot create a video test call by selecting more than two endpoints. Select a particular session on the Session Diagnostic page, and click Video Test Call, to create a test call for that scheduled session. Note This button gets activated only after you select a scheduled session. To see the list of the list of scheduled sessions, filter for scheduled sessions. Remember to select a session for a future time and date only. The Add Test Call pop up window appears, where you can click on the IP address of the endpoint to launch its application. The default option is to run the test call immediately but you can schedule the call also. For CTS endpoints select the SIP protocol only. For Ex and C Series endpoints you can choose between H.323 and SIP protocols, provided these endpoints are registered using these protocols. When you click the Add Call button, a message appears to notify you that the call has been added successfully. The scheduled call details can be seen on the Session Diagnostics page. You can see events and alarms, session statistics, endpoint statistics, and network topology with medianet statistics like other calls. This information is available for completed test calls also. You can stop the call immediately if it causes a problem on the network. You can stop a video test call which is in progress if it hampers your network. To stop a call, select the test call from the Sessions Diagnostic page, by setting the filter to Test Call Sessions. Hover around the session subject to launch the 360 Session View, and click the Stop Call icon to stop the in progress video test call. Test call lasts for around 5 minutes, after which it automatically stops. OL
8 Managing a Video Test Call Task Edit a scheduled video test call from Video Test Call Configurations page Administration > System Setup > Diagnostic Test > Video Test Call Configurations You can also view or delete video test calls from the same page. Description To edit a video test call, click Edit, and reschedule or run the call immediately by clicking Save. A message appears to notify you that the call has been modified successfully. 8 OL
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Last Modified: May 09, 2014 Americas Headquarters Cisco Systems, Inc. 170 West Tasman Drive San Jose, CA 95134-1706 USA http://www.cisco.com Tel: 408 526-4000 800 553-NETS (6387) Fax: 408 527-0883 Text
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This section includes the following:, page 1 Cisco Prime Collaboration allows you to configure system parameters for Cisco Prime Collaboration Assurance. The following are the system configuration parameters
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