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Add a Bandwidth Sizing Task

The bandwidth sizing task periodically sends a new planned bandwidth for bandwidth sizing-enabled tunnels (also known as label-switched paths or LSPs) to the Path Computation Server (PCS). The PCS determines whether it needs to provision the new planned bandwidth with a path that satisfies the new bandwidth requirement.

To add a bandwidth sizing task:

  1. Select Administration > Task Scheduler.

    The Task Scheduler page appears.

  2. Click the + (Add) icon.

    The Add Task page (wizard) appears.


    You can have only one bandwidth sizing task per Paragon Automation server. If you attempt to add a second, the system will prompt you to approve overwriting the first one.

  3. Configure the fields in each step of the wizard according to the guidelines provided in Table 1.

    Click Next to go to the next step.


    Fields marked with an asterisk (*) are mandatory.

  4. After you complete each step in the wizard, click Finish.

    A confirmation message appears on the top of the page, indicating that the task is added successfully.

    The details of this task are displayed on the Task Scheduler page.

Table 1: Fields on the Add Task Wizard (Bandwidth Sizing)



Add New Task

Task Name

Specify a unique name for the task. The name can contain only alphanumeric characters and some special characters (greater than (<), less than (<), colon (:), underscore (_), and hyphen (-)).

Task Group

From the list, select Bandwidth Management Tasks.

Task Type

From the list, select Bandwidth Sizing.

Bandwidth Sizing Task

Aggregation Statistic

From the list, select an aggregation statistic option.

The aggregation statistic works together with the task execution recurrence interval (the period of bandwidth adjustment) that you specify in the Schedule step in this wizard. The Path Computation Element (PCE) aggregates the LSP traffic for the interval based on the aggregation statistic you select, and uses that information to calculate the new planned bandwidth. The available options are:

  • 80th, 90th, 95th, 99th Percentile (X percentile)—Aggregation is based on the selected percentile.

    The ‘X’ percentile is the value at which ‘X’ percent of all the samples taken in the previous sampling period lie at or below the calculated value.

    For bandwidth sizing, the newly-calculated bandwidth value is taken as the ‘X’ percentile of the samples in the immediately-preceding bandwidth sizing interval.

  • Average—For each interval, the samples within that interval are averaged. If there are N samples for a particular interval, the result is the sum of all the sample values divided by N.

  • Max—For each interval, the maximum of the sample values within that interval is used.


Startup Options

Schedule—Select Activate Later for the task to start at a specific date and time.

In the field that appears, click the calendar icon to select the date and time at which you want the task to start. Then, click OK.

For the task to start at the current date and time, click Now at the bottom of the calendar.

  • You can schedule the task to repeat at a specific interval, from a minimum of 15 minutes to a maximum of one day. The default interval is one hour.

  • There is no per-LSP interval. The interval configured here applies to all LSPs for which bandwidth sizing is enabled.

  • LSPs for which traffic statistics are not available for a specified duration will not be resized if the bandwidth sizing task is scheduled to consider the statistics collected in the specified duration. This is because the task cannot differentiate between no traffic and zero bandwidth traffic.

Recurrence Options
  • Repeats—Specify the frequency (in Minutes, Hours, or Days) at which the task recurs.

  • Every—Specify the periodicity of the recurrence.

  • Ends—Select one of the following options:

    • Never—To configure the task to recur at the specified interval.
    • On—To select a date and time at which you want the task to end. In the field that appears, click the calendar icon and select the date and time. Then, click OK.
    • Now—To end a task at the current date and time, click Now at the bottom of the calendar.