Search

Page tree

Contents

You must have read/write permission to Network Discovery to initiate a discovery. After you start a discovery, you cannot change the configuration of the discovery, but you can start the discovery process immediately or schedule it for a later date. You can also configure a recurring discovery that repeats on a regular basis. For information, see Configuring and Starting an IP discovery and Scheduling IP Discovery. The appliance saves the configuration of the last discovery.
When you start an IP discovery from the IPAM Home, Net Map or Network List panel, you can select the networks on which you want the discovery to run. When you start an IP discovery from the IP Map or IP List panel, the discovered network is the one to which the IP addresses belong. You can include additional networks when you configure the IP discovery from the Discovery Manager wizard. You can run an IP discovery on multiple networks in one network view.

Guidelines for Starting and Scheduling IP Discovery

After you configure a discovery, you can start the discovery process immediately or schedule it for a later date. You can also configure a recurring discovery that repeats on a regular basis. When you start a discovery immediately or schedule for a later date after you configure it, the discovery happens only once and it will not be repeated. To repeat a discovery regularly, you can configure a recurring discovery. A recurring discovery occurs repeatedly based on the schedule you have configured. For more information about how to start a discovery immediately or schedule it for a later date, see Configuring and Starting an IP discovery and Scheduling IP Discovery.
You can configure IP discovery tasks independent of each other and each one contains a specific set of networks and discovery settings.
Note the following guidelines about immediate, regular and recurring IP discovery tasks:

  • You cannot run regular and recurring discovery processes concurrently.
  • If a recurring discovery is scheduled to start when a discovery is in progress, the recurring discovery will be postponed to the next schedule time. The current recurring discovery will not be performed.
  • You can pause and resume all discovery tasks.
  • You cannot start a discovery when another one has been paused.
  • You cannot use the start command to start a recurring discovery.
  • Discovery permissions are applicable to all discovery tasks.
  • When you start an IP discovery, only the available IP addresses in the network are discovered. The discovered data through a specific Discovery job can only be modified or deleted by the same Discovery job. When you start a different Discovery job to discover IP addresses in the same network and if some of the information in the network is changed, the newly discovered data and the originally discovered data (now old data) co-exist in the database. When you run the original Discovery job again, the old data is deleted or modified, or the new data is added depending on the information discovered.

Configuring and Starting an IP discovery

To start an IP discovery immediately after you configure it:

  1. From the Data Management tab, select the IPAM tab, and then select Discovery -> Discover Now from the Toolbar.
  2. In the Discovery Manager wizard, click the General tab, and then complete the following in the Basic tab:
    • Current Status: Displays the last discovery status and timestamp. This data is read-only.
    • Member Name: Click Select Member. In the Member Selector dialog box, select the Grid member from which you want to run the discovery. You can also use filters or the Go to function to find a specific member. For more information, see Using Filters and Using the Go To Function.
    • Merge the discovered data with existing data: When you select this check box, the appliance merges the discovered data with the existing data. It appends newly discovered data to existing data and preserves the existing data when there is no newly discovered data. This check box is selected by default.

      Note

      If you clear this check box, the appliance replaces the existing data with the newly discovered data and if there are no newly discovered values for some fields, the appliance removes the existing values for these fields and the fields become empty. 

    • Update discovered data for managed objects: Select this check box if you want the appliance to update the data of existing managed objects such as A records, PTR records, host records, and fixed addresses, with the discovered data. If you clear this check box, the appliance updates only the unmanaged objects. This check box is selected by default.
  3. Click Save to save the discovery configuration. Note that you must save the configuration before you can start a discovery.
  4. Click Start to start the IP discovery. You can also do one of the following:
    • Restore to Defaults: Restore the discovery configuration using the default values.
    • Pause: Stop a running discovery.
    • Resume: Resume the discovery that has been stopped.
    • Save: Save the discovery configuration.
    • Close: Cancel the configuration. If you have started a discovery, the discovery runs in the background when you click Close. For information, see Running Tasks in the Background.

      Note

      Once you start a discovery, you cannot change the discovery configuration. After you click Start, the button changes to Pause. You can click Pause to pause a discovery. When the discovery is paused, the button changes to Resume. You can click Resume to continue the paused discovery.

Defining IP Discovery Method

To configure the IP discovery method you want to use:

  1. From the Data Management tab, select the IPAM tab, and then select Discovery -> Discover Now from the Toolbar.
  2. In the Discovery Manager wizard, click the IPv4 Device Discovery tab, and then complete the following in the Basic tab:
    • Mode: Select the IP discovery method you want to use. For more information, see Supported IP Discovery Methods. If you select TCP or FULL, ensure that you configure the TCP ports in the Advanced tab. The default is FULL.
    • Click the Add icon to add networks. In the Network Selector dialog box, select the network view and networks. Use SHIFT+click and CTRL+click to select multiple networks. You can also use filters or the Go to function to find a specific network. For more  information, see Using Filters and Using the Go To Function.
      You can do the following in the table:
      • Click the Add icon again to add more networks.
      • Select a network or multiple networks in the network table and click Delete to delete them.
      • Click the Export icon to export the data in CSV format.
      • Click the Print icon to print the data.
    • Disable: Select this to exclude an IP discovery task. IP discovery is enabled by default.
  3. If you select TCP or FULL in Mode, click the Advanced tab and complete the following:
    • TCP Scan Technique: Select the TCP technique you want to use for the discovery. The default is SYN. For information, see TCP.
    • In the port table, select the check box of the port you want to configure. You can select all ports by clicking the check box in the header.
      Optionally, you can click the Add icon and complete the following to add a new service to the list.
      • Port: Enter the port number you want to add to the list. You must enter a number between 1 and 65535.
      • Service: Enter the name of the service.
      You can also delete a specific TCP port in the list. You can select multiple ports for deletion.
    • Timeout (ms): Enter the timeout value in milliseconds for the discovery. The timeout value determines how long the discovery waits for a response from an IP address after probing it. The minimum is 5 and the maximum is 4000. The default is 1000.
    • Attempts: Enter the number of times you want the discovery to probe an IP address when scanning a network. The minimum is 1 and the maximum is 5. The default is 2.
  4. Click Save to save the discovery configuration. Note that you must save the configuration before you can start a discovery.
  5. Click Start to start the IP discovery. You can also do one of the following:
    • Restore to Defaults: Restore the discovery configuration using the default values.
    • Pause: Pause a running discovery.
    • Resume: Resume the discovery that has been stopped.
    • Save: Save the discovery configuration.
    • Close: Cancel the configuration. If you have started a discovery, the discovery runs in the background when you click Close. For information, see Running Tasks in the Background.

You can do the following after a discovery is complete:

  • View the discovery status. You can view the current discovery status in the Discovery Status widget on the Dashboard. For more information, see Dashboards.
  • View the discovered data. For more  information, see Viewing Discovered Data.
  • Manage the discovered data. For more  information, see Managing Discovered Data.

Scheduling IP Discovery

After you configure a discovery (as described in Configuring and Starting an IP discovery), you can schedule to run a one-time IP discovery at a later date and time. You can also schedule a recurring IP discovery by configuring a recurrence pattern. The appliance automatically starts a recurring discovery based on the configured schedule and detects any newly added or removed networks. Note that you can only schedule the start of a discovery, you cannot schedule it to pause, stop, or resume. After a scheduled discovery starts, you can then pause, stop, or resume it.
You can schedule only one IP discovery at a time. Once you schedule a discovery, you cannot change the configuration until the task is cancelled or executed. You can however disable a recurring discovery. When you disable a recurring discovery, it will not recur during the scheduled interval.

To schedule a one-time IP discovery for a specific date and time:

  1. From the Data Management tab, select the IPAM tab, and then select Discovery -> Discover Now from the Toolbar.
    or
    From the Discovery Status widget, select Discover Now from the drop-down list, and then click Discovery Manager.
  2. In the Discovery Manager wizard, click the Schedule icon at the top of the wizard. In the Schedule Change panel, click Later, and then specify a date, time, and time zone. Click Schedule Start to schedule the discovery. If applicable, you can select Click here to view/manage the scheduled items to reschedule a discovery or view all scheduled discoveries.

To schedule a recurring IP discovery:

  1. From the Data Management tab, select the IPAM tab, and then select Discovery -> Schedule Discovery from the Toolbar.
    or
    From the Discovery Status widget, select Schedule Discovery from the drop-down list, and then click Discovery Manager.
  2. In the Discovery Manager wizard, complete the following in the scheduler:
    • Disable: Select this check box to disable recurring IP discovery. When you select this check box, IP discovery will not recur during the scheduled interval. Clear the check box to enable recurring IP discovery.
    If you select Hourly, complete the following:
    1. Schedule every hour(s) at: Enter the number of hours between each update instance. You can enter a value from 1 to 24.
    2. Minutes past the hour: Enter the number of minutes past the hour. For example, enter 5 if you want to schedule the rule update five minutes after the hour.
    3. Time Zone: Select the time zone for the scheduled time from the drop-down list.

         If you select Daily, you can select either Everyday or Every Weekday and then complete the following:

    • Time: Enter a time in hh:mm:ss AM/PM (hours:minutes:seconds AM or PM) format. You can also select a time from the drop-down list by clicking the time icon.
    • Time Zone: Select the time zone for the scheduled time from the drop-down list.

        If you select Weekly, complete the following:

    • Schedule every week on: Select any day of the week.
    • Time: Enter a time in hh:mm:ss AM/PM (hours:minutes:seconds AM or PM) format. You can also select a time from the drop-down list by clicking the time icon.
    • Time Zone: Select the time zone for the scheduled time from the drop-down list.

        If you select Monthly, complete the following:

    • Schedule the day of the month: Enter the day of the month and the monthly interval. For example, to schedule the rule update on the first day after every 2 months, you can enter Day 1 every 2 month(s).
    • Time: Enter a time in hh:mm:ss AM/PM (hours:minutes:seconds AM or PM) format. You can also select a time from the drop-down list by clicking the time icon.
    • Time Zone: Select the time zone for the scheduled time from the drop-down list.

    3. Click Save to save the configuration.

If the discovery task fails during a scheduled interval, the task stops and will not continue for the corresponding occurrence. The scheduled task resets and the discovery starts at the next scheduled time. For example, when you configure a recurring discovery to occur every five hours, discovery starts at the following hours on each day: 00:00, 05:00, 10:00, 15:00, and 20:00. If the discovery scheduled for 05:00 fails, the discovery starts at the next recurrence, which is at 10:00. For more information about failed discovery, see Guidelines for Starting and Scheduling IP Discovery.
The following examples explain when a recurring discovery starts based on your configuration:
Example 1
When you configure a recurring discovery to occur every five hours, the discovery starts at the following hours on each day: 00:00, 05:00, 10:00, 15:00, and 20:00. The first occurrence on each day starts at 00:00.
Example 2
When you configure a recurring discovery to occur every two days during a week, the discovery starts on the following days every week: Monday, Wednesday, Friday, and Sunday. The first occurrence starts on Monday of each week.

Monitoring IP Discovery Status

You can monitor IP discovery status through the Discovery Status widget on the Dashboard. You can also start, pause, resume, and stop a discovery from the widget. For more information, see Discovery Status.

This page has no comments.