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Configuring Threshold-Crossing Alarms for OTUs for Monitoring Link Performance

By monitoring the performance of links, you ensure that an end-to-end Ethernet service is always available over any path for a single link or multiple links spanning networks composed of multiple LANs. Link performance metrics enable operators to offer binding service-level agreements (SLAs) and generate new revenues from rate- and performance-guaranteed service packages that are customized to meet specific needs of their customers. To monitor link performance, you need to configure threshold-crossing alarms (TCAs) for optical channel transport unit (OTU) and optical data unit (ODU) of optical transport network (OTN) ports.

TCAs are alarms that are activated when a certain configurable threshold—near-end measurement threshold or far-end measurement threshold—is crossed and remains so until the end of the 15-minute interval and the 24-hour interval for parameters such as OTU and ODU. A near-end measurement is associated with ingress data frames and a far-end measurement is associated with egress data frames.

You can configure TCAs for both the minimum and maximum values for gauges and the maximum values for counters. A gauge represents a non-negative integer, which may increase or decrease, but never exceeds a maximum value. A gauge has its maximum value whenever the information being modeled is greater than or equal to the maximum value. If the TCA parameter subsequently goes below the maximum value, the gauge also decreases. A counter represents a non-negative integer that monotonically increases until it reaches a maximum value of 232–1.

The timely detection of TCAs is essential to proactively manage an interface. TCAs are not an indication of a fault, but rather an indication that the entity may be close to a fault. You can enable the TCA that you want monitor. You can keep the default threshold settings or change the settings.

To configure TCAs for OTU parameters:

  1. From the Junos Space user interface, click the Build icon on the Connectivity Services Director banner.

    The workspaces that are applicable to Build mode are displayed on the Tasks pane.

  2. From the View selector, select Device View.

    The functionalities that you can configure in this view are displayed.

  3. From the Device View pane, click the plus sign (+) next to the My Network tree to expand the tree and select the device for which you want to define the optical port settings.

    The network tree is expanded and the selected device is highlighted.

  4. From the Tasks pane, select Device Management > View Physical Inventory.

    An image of the device is displayed on the right pane.

  5. In the the image of the device, select an OTN interface or port—for example, a 100-Gigabit Ethernet optical transport network (OTN) MIC installed in a PTX Series router.

    The Optical Port dialog box is displayed. At the lower part of the dialog box, the OTU Section and ODU Section panes are displayed in a collapsed form.

  6. Click the OTU Section header at the bottom of the dialog box.

    The OTU Section pane is expanded and displayed. This pane contains the Equipment, Status/Config, and Performance tabs.

  7. Click the Performance tab at the bottom of the pane.

    The OTU PMs dialog box is displayed with the performance monitoring counters and metrics that pertain to the OTU. This dialog box contains the Perf Mon and TCA Config tabs. At the top-left corner of the PMs dialog box, the TCA Config tab (green right arrow enclosed in a square) is displayed.

  8. Click the TCA Config tab to configure the TCAs for the different optical interface, OTU, or ODU attributes. The dialog box is refreshed to display the different performance monitoring parameters. These parameters can be edited inline.

    Inline editing enables you to modify previously defined settings easily and quickly. Embedded editing is also enabled, which causes the grids showing the devices and interfaces to become modifiable directly; you do not need to highlight, edit, and save the changes every time.

    A gray triangle in the upper-right corner of a field denotes that the value of that field or attribute has been modified.

  9. For the parameters under each performance monitoring category for which you want to modify the TCA value, click the value in the Threshold-15Min or Threshold-24Hr columns to set the TCA value for the 15-minute interval or 24-hour interval. You can also select or clear the check box in the Enable column to enable or disable the TCA value for the specified parameter, respectively.
  10. Click Update to save the configured threshold settings. Alternatively, click Cancel to discard the configuration.

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