FACT Scanning

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FACT scans an entire subnet at the same time. It connects to each managed Cisco switch and optionally to each port.

FACT has four types of scans:

  • fabric scan
  • tech-support scans
  • port-counters scans
  • incomplete scans


Fabric scan--Finds the static configuration of the network. After collecting a fabric scan, FACT can answer queries about the network components and determine how they are connected.

Tech-support scan--Collects information that can be forwarded to a customer-support organization. A tech-support scan includes a fabric scan, which FACT can use, although FACT does not use the additional information. FACT saves that information for an expert to inspect.

Port-counters scan--Collects port counters from the Performance Manager, in addition to the data collected in a fabric scan. See the Port Counters section for more information.

Incomplete scan--A scan that has failed, either because of misconfiguration or because devices are not responding. The most common reason for an incomplete scan is either because the configuration does not include the device that is running the master Subnet Manager or because it includes two master Subnet Managers. In either case, change your configuration so that it includes exactly one master Subnet Manager. Alternately, you can force FACT to use the correct master Subnet Manager by setting subnet-manager: in the .fact.conf file or with the subnet-manager hostname command option.


Note: If you are using the High-Performance Subnet Manager, then you must allow FACT to scan the hosts running HSM.

You can use the trace option to show FACT communication with each managed node as it scans.

The following list contains FACT scanning commands:

  • scan fabric
  • scan tech-support
  • scan port-counters raw
  • scan port-counters monitored
  • scan port-counters monitored threshold
  • reset port-counters

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