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The ranges table displays each defined range, its type (CIDR, IP Range, or IP Pattern), and its use in the discovery process. Ranges excluded for discovery indicate that any network device found matching that range is excluded from discovery by the appliance. See Range Examples for more information.
Creating Discovery Ranges
Every discovery range you create must be associated with a network view. If no network views are specifically defined in your deployment, your discovery ranges will automatically be assigned to the automatically created network view Network 1. For the first discovery of the network, this network view is automatically assigned to the SCAN1 port when you set up the appliance using the configure server command.If more than one network view exists, you can choose the network view with which the discovery range will be associated, by clicking the Network View drop-down menu. If only one network exists in NetMRI, this setting does not appear. The chosen network view must also be associated with a scan interface, otherwise, discovery does not take place. Unassigned network views that do not have an assigned scan interface or virtual scan interface appear with a caution icon (
) in discovery ranges configuration. For more details, see Configuring Network Views.
Network views can contain multiple discovery ranges. So when you create other ranges, you can assign the same network view to each. However, you can assign each discovery range to only one network view. Also, ensure that the ranges you assign to each network view make sense. Selecting the network view in an Operations Center environment also involves other details. For more information, see Defining Discovery Ranges on Operations Center Collectors.
You can define discovery ranges that will be excluded from management. This is useful for devices you may not want to manage, but want to know about for inventory purposes. End Host network segments are a good example.
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For discovery ranges, configuring Discovery Blackouts requires the use of the Admin account. |
To create a discovery range, complete the following:
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- CIDR: Enter the IP Prefix value and its CIDR subnet value in the drop-down.
- IP Range: Specify an IP range using a beginning and ending value.
- IP Pattern: Specify a wildcard pattern for matching IP addresses.
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If you are discovering end host subnetworks for Switch Port Management, choose the Exclude From Management option for the end host discovery ranges. |
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An advanced setting, Discovery Status Precedence (Settings icon –> NetMRI Settings –> Advanced Settings –> Discovery group –> Discovery Status Precedence), governs the global setting for exclusion ranges. Changing this Advanced setting to Longest Prefix Match enables an exclusion range to contain smaller IP ranges that can be matched against to allow discovery — for example, you can exclude a /23 network, but Include a /24 prefix within the EXCLUDE range, because the /24 is a longer prefix. |
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The discovery ping sweep feature differs from the Smart Subnet ping sweep in the following ways: the discovery ping sweep will run only against the specified range, the sweep will run regardless of the range size, and the sweep will run regardless of the number of discovered devices within the specified range. |
6. Select the Enable Discovery Blackout check box and click its Scheduling icon.
7. Define your schedule as follows:
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- Choose an Execution Time from the drop-down list.
- Specify the Duration: 10 or more Minutes, Hours, or Days.
- If you choose Weekly, complete the following:
- Choose an Execution Time from the drop-down list.
- Check the check boxes for one or more days from Sunday through Saturday.
- Specify the Duration: 10 or more Minutes, Hours, or Days.
- If you choose Weekly, complete the following:
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Specify the Duration: 10 or more Minutes, Hours, or Days.
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For more information about discovery blackouts and change blackouts, see Defining Blackout Periods. |
8. Select the Enable Change Blackout check box and click its Scheduling icon. Follow the instructions for the Enable Discovery Blackout setting in the previous step.
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Creating Blackouts for Individual Devices
To support discovery blackouts for individual devices, obtain the Management IP address for the device in question, and assign that IP address to a /32 or /128 discovery range. Define the discovery blackouts settings as you would for any other discovery range. This practice may be handy, for example, for strategic routers and switches that cannot incur excessive latency for transaction traffic. However, this approach means that you cannot create change blackouts for individual devices.
Defining Discovery Ranges on Operations Center Collectors
If you have an Operations Center with at least two Collector instances, you can assign different discovery ranges to different Collectors, or assign a range to all collectors in an OC for the same purpose. The Filter by Collector drop-down menu provides a listing of all Collectors and their respective device limits, which are associated with the licensing limits for each Collector appliance. You also choose the Network View, which lists all network views with their collector appliance names in brackets.
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Network 1 (NM35) Network 1 (NM36)
Here each Collector, NM35 and NM36, is associated with the same network view.
- For an OC deployment managing multiple networks, choose the desired Collector from the Filter by Collector list. Then, select the network view under the Network View list.
The licensing limits correspond to those described in the topic Understanding Platform Limits, Licensing Limits and Effective Limits. Each Collector entry listed in the Filter by Collector drop-down menu in the lists the following information:
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Device Limit
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Shows the maximum device license count for the Collector–the maximum number of devices the Collector is licensed to manage. This value does not apply to discovered device counts, which can be higher. The value in this column corresponds to an Effective Device Limit for the Collector.
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Devices Licensed
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The number of currently used device licenses for the listed Collector. The difference between this value and the Device Limit, if any, represents the number of unused device licenses remaining available to the Collector.
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| Discovery ranges associated with network views unassigned to a scan interface are not used for discovery. |
To assign a discovery range to an Operations Center Collector, complete the following:
- Obtain or calculate the network range values. You can define a Network address (in effect, a subnet prefix), an IP range, or an IP pattern.
- Click the Settings icon > Setup > Discovery Settings > Ranges.
- Click New.
- Choose an appropriate way to specify the range:
- CIDR: Enter the IP Prefix value and its CIDR subnet value in the drop-down.
- IP Range: Specify an IP range using a beginning and ending value.
- IP Pattern: Specify a wildcard pattern for matching IP addresses.
- For Discovery Mode, select one of the following:
- Include in discovery: Any device found matching that range is discovered and managed by NetMRI.
- Exclude from discovery: Ignore the specified values and do not discover them through any of the specified protocols.
- Exclude from management: Indicates that NetMRI discovers any device found matching that range, but NetMRI will not manage or collect data from the device.
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If you are discovering end host subnetworks for Switch Port Management, choose the Exclude from management option for the end host discovery ranges. |
8. To use a discovery ping sweep (an ICMP ping that is broadcast to all addresses in a subnet) during discovery on IPv4 networks, click the Enable Discovery Ping Sweep check box. Ping sweep is not available for IPv6 network values. For more information on ping sweeps, see Defining Group Data Collection Settings.
9. From the Filter by Collector drop-down menu, choose the Collector from the list or select All. Ensure that the chosen Collector has enough space in its license allocation to accommodate the number of devices you expect the Collector to manage in the discovery range.
If the discovery range you wish to assign to the Collector is designated as Exclude from Management, the range can be of greater scope.
10. From the Network View drop-down menu, choose the network view to which the range will be assigned. If the network view is divided among two or more Collectors as described above, select the desired network view entry based on the associated Collector name.
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