Administer > Discover your network > Configure discovery

Configure discovery

[This is the Context-Sensitive Help topic for the Discovery Configuration form.]

NNMi uses Simple Network Management Protocol (SNMP read-only queries), and a variety of communication protocols to discover the physical and virtual devices within the network management domain that you define.

NNMi provides one predefined Tenant, the Default Tenant. Each Node must be assigned to a Tenant. If you choose to use Auto-Discovery Rules, those rules apply only to the nodes within the Default Tenant. All other Discovery configuration settings apply to the nodes within all Tenants.

During discovery, NNMi processes 200 nodes at a time. If you want to discover a very large number of nodes—for example, more than 10000—you can run discovery on nodes in smaller batches, each containing up to 500 nodes. This method helps you discover high-priority nodes in the first run of discovery.

Tip Optional. Establish additional Tenant configurations to identify overlapping address domains or to fine tune Layer 2 connections between devices in your network domain.

Devices that belong to the Default Tenant can have Layer 2 Connections to any device in any Tenant. Devices within any Tenant other than Default Tenant can have Layer 2 Connections only to devices within the same Tenant or the Default Tenant.

Discovery Configuration Tasks
Task How
Prerequisites for Discovery

Complete all prerequisites..

Establish Global Defaults for Spiral Discovery

Use the Global Control panel to review the default values that NNMi provides. Determine if those defaults work for Spiral Discovery in your network environment. NNMi administrators can change the default settings at any time.

Configure Schedule Settings

Use the Schedule Settings tab to review the default values that NNMi provides for Spiral Discovery's Schedule Settings. Determine if those defaults work for Spiral Discovery in your network environment. NNMi administrators can change the default settings at any time.

Configure Auto-Discovery Rules

Optional. Use the Auto-Discovery Rules tab to to specify ranges of IP addresses or MIB-II sysObjectID values (or both) that you want NNMi to automatically discover or never discover within the Default Tenant.

NNMi assigns each node found by Auto-Discovery to the Default Tenant (and whichever Security Group attribute value is currently configured for the Default Tenant = the Default Security Group out-of-box).

Configure IPv4 Subnet Connection Rules Optional. Use the IPv4 Subnet Connection Rules tab to establish connections between interfaces on devices that do not respond to Layer 2 discovery protocols (see the list of Topology Source protocols in Layer 2 Connection Form). For example, use Subnet Connection Rules to establish connections to WAN edge devices that NNMi would not automatically detect.
Configure an Excluded IP Addresses Filter

Optional. Use the Excluded IP Addresses tab to provide a list of specific addresses or ranges of addresses that you want NNMi to never discover or monitor.

This filter applies to all nodes in all Tenants.

Configure an Included Interface Ranges Filter

Optional. Use the Included Interface Ranges tab to provide a MIB-II sysObjectID list and designate which Interfaces within devices of that type NNMi is permitted to discovery (all other interfaces within devices meeting the MIB-II sysObjectID criteria are ignored).

This filter applies to all nodes in all Tenants.

Configure an Excluded Interfaces Filter

Optional. Use the Excluded Interfaces tab to provide a list of specific interfaces that you want NNMi to never discover or monitor.

This filter applies to all nodes in all Tenants.

Choose Techniques to Launch Discovery

You control Spiral Discovery's starting points:

  • Any Tenant: Use the Seeds Configuration workspace to specify the nodes to be discovered.

    Tip Use the Seeds workspace to verify that NNMi successfully located each Discovery Seed that you provided.

Default Tenant only: If you choose to use Auto-Discovery, there are two choices for launching discovery. Seeds can provide the starting points from which Auto-Discovery gathers information about neighboring devices to expand discovery. Or Ping Sweep settings can enable Auto-Discovery to find any device that responds to Ping commands.