Information Level

Overview

Identifying fault information is difficult if there is a large amount of information. Setting information levels allows users to rapidly identify information.

Information Levels

Table 1 describes eight information severities. The lower the severity value, the higher the severity.

**Table 1** Definition of each information level
Value	Severity	Description
0	Emergency	A fatal fault, such as an abnormally running program or unauthorized use of memory. The system must be restarted after the fault is rectified.
1	Alert	A serious fault. For example, device memory reaches the maximum limit. Such a fault must be rectified immediately.
2	Critical	A critical fault. For example, memory usage reaches the upper limit, the temperature reaches the upper limit, or bidirectional forwarding detection (BFD) detects an unreachable device or error messages generated by a local device. The fault must be analyzed and rectified.
3	Error	An incorrect operation or unexpected process. For example, users enter incorrect commands or passwords, or error protocol packets received by other devices are detected. The fault does not affect subsequent services and requires cause analysis.
4	Warning	An exception. For example, users disable a routing process, BFD detects packet loss, or error protocol packets are detected. The fault does not affect subsequent services and requires attention.
5	Notice	A key operation is performed to keep the device running properly. For example, the shutdown command is used on an interface, a neighbor is discovered, or the protocol status changes.
6	Informational	A routine operation is performed to keep a device running properly. For example, the display command is used.
7	Debugging	A routine operation is performed to keep a device running properly, and no action is required.

Logs can be output or filtered based on a specified severity value. A device can output logs with severity values less than or equal to the specified value. For example, if the log severity value is set to 6, the device only outputs logs with severity values 0 to 6.