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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.

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9. Click Add to place the new discovery range into the Range table.

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.

• For an OC deployment managing a single large network, you choose the network view entry from the Network View list. You will see multiple entries in the pages under Settings icon –> Setup –> Discovery Settings for the Network View list. The entire network is assigned to a single network view. However, each network view entry is identified through the association of each Collector. This allows you to edit discovery settings for each Collector in the same network view.
  Examples:

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.

To assign a discovery range to an Operations Center Collector, complete the following:

1. 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.
2. Click the Settings icon > Setup > Discovery Settings > Ranges.
3. Click New.
4. 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.
5. 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.

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.

11. Click Add. The new range appears in the ranges table.