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After you establish your scan interface's connection to their network, discovery automatically begins polling the IP addresses in the network view (based on discovery settings) and begins to report what it finds to the Discovery tables under Network Explorer > Discovery.

NetMRI automatically collects discovery data from pure L3 routing devices every 180 minutes. This setting cannot be changed.

Discovery identifies contacted devices by their IP address and hostname, and IP addresses are gathered under a few categories: ClassifiedReached, and Identified, which is the complete aggregate of all discovered IPs. Classified and Reached IPs are subsets of the Identified classification. These values appear in a simple bar graph at the bottom of the Discovery page.


A device is considered an active device for management if NetMRI can poll and monitor the device using the SNMP protocol.


Network polling settings can also be defined for managing a more or less continuous discovery process during NetMRI operation. To do this, click the Settings icon > Collection and Groups which provides a second group of important settings for governing automatic discovery behavior.

For all networks, NetMRI discovers and stores the following information:

  • Globally routable interface IP addresses.
  • VRRP/HSRP virtual IP address (if applicable).
  • Associated VLANs.
  • BGP AS and neighbor adjacencies (if applicable).
  • Cisco VoIP endpoint devices.
  • GLBP virtual IP (if applicable).
  • VRF configurations, including their respective private network information. NetMRI notifies the user through a System Health alert when it discovers VRF configurations. The alert advises you to assign the VRFs to a network view.
  • IPv6 networks and subnet masks.
  • IPv6 Link-local interface IP addresses.
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