Device Reconfiguration

Device reconfiguration includes changes to physical device components and the software configuration, such as monitoring response path tests for protocols. Data Aggregator uses the same method to monitor both types of reconfiguration. To keep device components up-to-date, you can monitor and update device reconfiguration changes in Data Aggregator.
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Device reconfiguration includes changes to physical device components and the software configuration, such as monitoring response path tests for protocols. Data Aggregator uses the same method to monitor both types of reconfiguration. To keep device components up-to-date, you can monitor and update device reconfiguration changes in Data Aggregator.
Additional examples of reconfiguration changes include:
  • Adding a board to a device, which adds more ports.
  • Adding memory, CPUs, physical interfaces, or any metric family to a discovered device.
  • Reconfiguring a virtual switch.
  • Changing the configuration of a device to include a discovered device in routing protocols.
When a change is detected, Data Aggregator generates reconfiguration events and can update its representation of the metric family to reflect the changes to device components. View reconfiguration events by selecting Dashboards, Operations, Events Display.
Understanding how change detection works in Data Aggregator helps you to select the options that are best suited to monitoring device reconfiguration in your environment. For example, you can set the frequency for change detection monitoring.
How to Manage Change Detection
Change detection management planning helps ensure that Data Aggregator detects and monitors device reconfigurations in your environment according to your needs. You can plan ahead for any device reconfiguration when you first set up Data Aggregator to discover new devices. You can also edit these options at any time after devices are discovered.
Refer to the following guidelines when planning change detection:
  • Likelihood of change.
  • Frequency of change.
  • Tolerance for outdated data.
Monitor metric families, such as CPUs, for reconfiguration infrequently. For dynamic metric families, such as virtual systems, choose a more frequent rate.
Follow this process:
  1. Create or edit a custom
    monitoring profile. (You can also copy a factory monitoring profile and edit the copy.)
  2. Select
    Enable Change Detection
    and set the
    Change Detection Settings
    ,
    Rate
    in the monitoring profile.
    The Change Detection Settings, Rate option is used to set the frequency at which Data Aggregator checks for changes. The rate of detection can be set in minutes or hours. By default, the rate is set to 24 hours.
  3. Update the Data Aggregator representation of the metric families.
    After you set the change detection rate, you have two options for correcting the Data Aggregator configuration: automatic or manual update of the metric families. Manual Update updates the representation of the metric families
     
    by ensuring the correct set of components is being monitored.
    • To avoid having to make changes when a reconfiguration is detected, select
      Automatically Update Metric Families
       (selected by default). Data Aggregator automatically starts monitoring any new components, and marks any components that are no longer detected as Not Present.
      View the Events Display dashboard to see reconfiguration events:
      • If the components have changed for a device, an event is generated on the associated device. This event describes that a component change has been detected and will be applied after a short period.
      • After component reconciliation is applied, another event is generated. This event describes how many components were added, how many are not present, and how many remained unchanged.
    • To stop the Data Aggregator from automatically monitoring new components or Not Present components, deselect
      Automatically Update Metric Families
      .
      View the Events Display dashboard to see reconfiguration events:
      • If the components have changed for a device, an event is generated on the associated device. This event describes a component change that has occurred without reconciliation.
      To have the reconfiguration changes applied, manually click
      Update Metric Family
       on the Polled Metric Families page for a device.
  4. To enable the monitoring profile, assign the custom monitoring profile to a device collection.
  • If your environment is undergoing major maintenance, turn off the automatic update until the maintenance is complete. For small, regular changes, enable the automatic update feature to ensure that your Data Aggregator stays up-to-date.
  • Monitoring profiles are assigned to device collections. If you want to monitor special devices differently, create a custom device collection and assign a custom monitoring profile with the desired change detection settings. For example, you can monitor critical core routers more frequently than other routers by creating a device collection and assigning a custom monitoring profile that performs change detection hourly. Other routers remain in the 'All Routers' device collection using the factory monitoring profile (with no change detection), or a custom monitoring profile that you set to less frequent change detection.
Update Device Reconfiguration Automatically
Reconfiguration changes to a discovered device can affect the metric families that are associated with the device. The device reconfiguration can update automatically in the monitoring profile to which the metric families are assigned, which applies to any metric families that the monitoring profile includes. This option is set by default when you create a custom monitoring profile, but it can also be edited at any time.
When the metric family is updated, Data Aggregator has an accurate representation of the device configuration. Reports that you generate reflect accurate information.
Follow these steps:
  1. Select the monitoring profile that you want to update automatically and click
    Edit
    .
  2. Select
    Enable Change Detection
    .
  3. Set the
    Change Detection Settings, Rate
    to a value that is greater than zero.
    Consider how frequently the metric family is likely to change, and how many devices the monitoring profile is applied to. Avoid setting change detection rates that are more frequent than necessary.
  4. Select
    Automatically Update Metric Families
    .
  5. Click
    Save
    .
    When you make a configuration change to a device that is associated with this monitoring profile, the device configuration is updated automatically.
    When a device configuration is updated, Data Aggregator does the following steps:
    • Generates an event on the monitored device.
    • Identifies new components and creates them.
    • Identifies components that are no longer present and marks them as Not Present.
    By default, components that are not present are not synchronized with
    CA Performance Center
    . To enable this option, select
    Synchronize items that are no longer present on the device
    on the Manage Data Sources page.
    • Identifies existing components that have changed from a previous discovery. The Name column changes, if applicable.
      Historical data is accessible and can be reported on.
Update Device Reconfiguration Manually
Reconfiguration changes to a discovered device can affect the metric families that are associated with the device. The device reconfiguration can be updated manually when
Automatically Update Metric Families
 is not selected in the associated monitoring profile. View the event logs to identify reconfiguration events for which you want to update the metric families.
When the metric family is updated, Data Aggregator has an accurate representation of the device configuration. Reports that you generate reflect accurate information.
Follow these steps:
  1. View the event logs to identify reconfiguration events for which you want to update the metric families.
  2. Click
    Monitored Devices
    from the Monitored Inventory menu for a Data Aggregator data source.
    The Tree View tab appears.
  3. Select
    Device by Collection
    from the drop-down list, and select the monitored device that was updated from the corresponding tree view.
    The Polled Metric Families tab shows the consolidated monitoring profiles that are associated with a device. Devices only have one consolidated monitoring profile. Each consolidated monitoring profile lists every metric family that can be polled on the device, and whether the device supports the metric family.
  4. Select the metric family for which you want to update the configuration and click
    Update Metric Family
    .
    Your device configuration is updated, and Data Aggregator does the following steps:
    • Generates an event on the monitored device.
    • Identifies new components and creates them.
    • Identifies components that are no longer present and marks them as Not Present.
    • Identifies existing components that have changed from a previous Discovery. The Name column changes, if applicable.
      Historical data is accessible and can be reported on. 
Reconfiguration Detection of Ports
Reconfiguration changes to a discovered device may cause ports to be reconfigured. The new port and the old port are identical if either of the following is true for the Interface metric family after the reconfiguration: 
  • The PortType and Description attributes in the Interface metric family remain the same.
  • The PortType and at least two of the following remain the same: 
    • Alias
    • Description
    • MacAddress
    • Index
For all other metric families, the new component and the old component are identical if both Name and Index remain the same after the reconfiguration.