# Link Quality Indicator (LQI)

This is a status indicator, similar to the signal strength bar display on a mobile phone, that enumerates link quality as a range of 0-5, with 5 being very good. Values in the lower part of the range may indicate hardware problems with components such as ports and cables that surface as signal integrity issues, leading to performance and other problems. The LQI gives you an instantaneous view of a link's quality on every hardware port.

Link Quality Values and Description
Link Quality Value | Description
--- | ---
5 | Working at or above preferred link quality, no action needed.
3 | Working on low end of acceptable link quality, recommend corrective action on next maintenance window.
2 | Working below acceptable link quality, recommend timely corrective action.
1 | Working far below acceptable link quality, recommend immediate corrective action.
0 | Link down
Note: Corrective action entails diagnosing the hardware (links/cables and ports/devices). For example: Are the cables bad or improperly placed? Is the HFI/switch responsive? Does rebooting the device/sever fix the issue?