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About the Path Optimization Page

To access this page, select Network > > Traffic Engineering > Path Optimization.

You can use the Path Optimization page to run path analysis and generate a report to help you determine whether optimization should be done. Based on the analysis, you can choose to optimize paths on demand from this page or set a timer to trigger the optimization automatically at regular intervals from the Pathfinder page (Configuration > Network > Pathfinder).


Path analysis and optimization are applicable only to Path Computation Element-initiated LSPs (PCE-initiated LSPs) and Path Computation Client-delegated LSPs (PCC-delegated LSPs) because the PCE doesn’t attempt to optimize PCC-controlled LSPs.

Tasks You Can Perform

  • Analyze the network—You can analyze the network for optimization opportunities. The Path Analysis report is generated automatically after path analysis and you can use this report to determine whether optimization should be done.

    To trigger path analysis, click Analyze in the top-right corner of the Path Analysis table.

    All the PCE-initiated and PCC-delegated LSPs in the network are analyzed automatically for optimization opportunities, and the Path Analysis report is generated.

    This report lists the LSPs that are currently not in an optimized path, suggests what the optimized paths should be, and provides data about what could be gained (in terms of the number of hops, admin weight, and so on) if the LSPs were to be optimized.

  • Optimize paths in the network—Optimization enables the Path Computation Element (PCE) to re-establish an optimal set of paths for a network by finding the optimal placement of LSPs using the current set of nodes and links in the network.

    To trigger path optimization, click Optimize in the top-right corner of the Path Analysis table.

    An alert message appears asking you to confirm the operation.

    If you click Yes, the PCE sends a provisioning order to the network to optimize all PCE-initiated and PCC-delegated LSPs. In case of provisioning delays or recent changes in the network, low priority LSPs or low bandwidth LSPs may be temporarily unrouted. The PCE will attempt to reprovision these unrouted LSPs until it finds a path.

    After optimization is complete, the following reports are generated:

    • Path Optimization—Lists the optimized LSPs and their details (such as the path name and optimized path).

    • LSP Path Changes—Lists changes (in terms of delay, number of hops, path cost, and so on) to the LSPs as a result of optimization.

    • RSVP Link Changes—Lists changes in link RSVP bandwidth reservation (in terms of bandwidth, utilization, and so on) for the LSPs as a result of optimization.


    The optimization is based on the current network conditions, not on the conditions in effect the last time the analysis was done.

  • View the most recent reports—You can view the most-recently generated Path Analysis, Path Optimization, LSP Path Changes, and RSVP Link Changes reports.

    To view these reports, click Reports in the top-right corner of the Path Analysis table and select the type of report that you want to view.

    The selected report is displayed on the Path Optimization page.

  • Show or hide columns that contain information about the reports—Click the vertical ellipsis icon on the top-right corner of a report and select the check boxes corresponding to the columns that you want to view in the report. Only the selected columns are displayed in the report.