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Splitting a Flow into Sub-Flows

To create sub-flows, ensure that you have more than one equal-cost multipaths (ECMPs) between the source and destination. If you do not have ECMPs, between the source and destination, change the OSPF cost metrics of the links in one or more paths between the source and destination (Metrics field and the OSPF field in the Protocols tab of the Modify Link window (Link > Modify Link).

To split a flow into sub-flows:

  1. From the Demands tab of Network Info table, double-click the flow you want to modify, or select the flow and click Modify > Selected...) to bring up the Modify Demand window.
  2. Click the Type button to bring up the Demand Type Parameter Generation Window.
  3. Select the ECMP checkbox and enter the number of sub-flows desired. The default number of sub-flows is 6 if no value is entered, or it can be set based on the bandwidth using the ECMPcntByBW parameter. Then click OK.
  4. On the Design tab of the Demand Type Parameter window, set the Routing Method to OSPF and click OK.
    The Modify Demand window appears. Notice the new value in the Type field in the Properties tab is changed to R, RM=OSPF,ECMP=10.
  5. Click OK to return to the Network Info table.

    Sub-flows are displayed differently in the Type column.

  6. Open the ECMP Report in the Report Manager (Report > Report Manager > Network Reports > Demand Reports > Equal Cost Multi-Path) to view the newly created ECMP demands in the report.