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    Replaying Traffic in the Offline Model

    1. If traffic data collection was started for the online network, you can retrieve past traffic data in offline mode and view the historical link utilization. By default, the last 24 periods of the traffic collection are saved into the offline network model. To access this information, go to Traffic > Traffic Load in offline mode. You should see the following window:

      Figure 1: Load/Util Window

      Load/Util Window
    2. Select the Interface radio button. Then use the mouse to click on the tick marks representing the last 24 periods of traffic. The utilization shown the Map window will reflect the traffic for that period. Alternatively, you can press the Run button and the program will automatically step through the last 24 periods of traffic.

      Note: If you have an MPLS-enabled network, from this window you can also see the traffic carried by LSP tunnels on each link. In order to see this, be sure you are in Tunnel Layer (on the main toolbar) when you go to Traffic > Traffic Load. Then, select the Tunnel radio button. Use the mouse to click on the tick marks representing the last 24 periods of traffic.

      The interval between each period may vary depending on your data collection settings. The default is 300 seconds (5 minutes). This value is set within the Traffic Collection Manager.

      Figure 2: Setting the Traffic Collection Interval

      Setting the Traffic Collection Interval
    3. In the Report Manager (Report > Report Manager), the Network Reports > Interface Traffic > Interface Traffic report also reflects the 24 periods of traffic.

      Note: If you have an MPLS-enabled network, there is also a corresponding tunnel traffic report for the last 24 periods. Switch to Tunnel Layer mode, go to Report > Report Manager. Click on the Tunnel Layer Network Reports > Tunnel Reports > Tunnel Traffic report. To find out the starting time and interval for the data points in the report, click on the “Explanation” button.

    4. To retrieve even earlier traffic from the database, use the lower portion of the Load/Util window to specify a Start From date and time as well as Interval. Then press the Fetch button. If you specify an interval value that is greater than that used in the data collection, then all data points within the interval will be averaged together. Click the mouse on the tick marks to see the corresponding traffic on the Map. In the Report Manager, the Interface Traffic report should also be updated to reflect the fetched traffic statistics.
    5. To view traffic charts from the Map window, you can right-click on a link and select any of the menu items in the Traffic Load submenu to bring up the corresponding chart.

    For more information on offline analysis, please refer to the Router Feature Guide for IP/MPLSView or the IP/MPLSView Java-Based Graphical User Interface Reference as a reference manual on how to use a particular window.

    Modified: 2016-11-08