What is the purpose of the red exclamation icons that I see?

The purpose of the red exclamation icons are to indicate to the viewer which devices/sites that have gone stale. Stale devices can be defined by the user, by default devices that have not reported any information about themselves in the predetermined amount of time are considered stale. This approach is used to inform the user/viewer about possible issues that need to be resolved. Possible issues that will cause stale devices are:

  1. When the device has been moved to a new location
  2. NIC (Network Interface Device) of the device has been changed, hence the MAC address will be different and the device will be seen as a whole new device.
  3. SNMP is disabled on the device.
  4. Network failure which the device is part of can cause the device to show up as stale.
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