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 inline amplifiers (ILAs)
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 the optical
OLA. 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 the TCAs for optical ILA parameters:
- 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.
- From the View selector, select Device View.
The functionalities that you can configure in this view are
displayed.
- 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.
- 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.
- From the Tasks pane, select Device Management > View
Physical Inventory.
An image of the device is displayed on the right pane.
- Select an optical ILA in the image of the device.
The ILA Optics dialog box is displayed, which contains the Equipment,
Status/Config, and Performance tabs. For example, if you select an
optical inline optical amplifier (ILA), which is used in conjunction
with the integrated photonic line card (IPLC) that is installed in
the PTX3000 routers, the optical ILA Optics dialog box is displayed
beneath the graphical view of the chassis. The Equipment, Status/Config,
and Performance tabs are displayed at the bottom of the page.
- Click the Performance tab at the bottom of
the pane. The Optics PMs dialog box is displayed with the performance
monitoring counters and metrics that pertain to the optical ports.
This dialog box contains the Perf Mon and TCA Config tabs.
- Click the TCA Config tab to configure the TCAs for the
different optical ILA 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 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.
- 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 Yes
or No in the Enable column to enable or disable the TCA value for
the specified parameter.
- Click Update to save the configured threshold
settings. Alternatively, click Cancel to discard the configuration.
