4000 Router Series Network Management and Monitoring Configuration Guide

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Configuring the information center

The information center on a device classifies and manages logs for all modules so that network

administrators can monitor network performance and troubleshoot network problems.

Overview

The information center receives logs generated by source modules and outputs logs to different

destinations according to user-defined output rules. You can classify, filter, and output logs based on

source modules. To view the supported source modules, use info-center source ?.

Figure 59 Information center diagram

By default, the information center is enabled. It affects system performance to some degree while

processing large amounts of information. If the system resources are insufficient, disable the information

center to save resources.

Log types

Logs fall into the following types:

• Common logs—Record common system information. Unless otherwise specified, the term "logs" in

this document refers to common logs.

• Diagnostic logs—Record debug messages.

• Security logs—Record security information, such as authentication and authorization information.

• Hidden logs—Record log information not displayed on the terminal, such as input commands.

Log levels

Logs are classified into eight severity levels from 0 through 7 in descending order. The router outputs logs

with a severity level that is higher than or equal to the specified level. For example, if you configure an

output rule with a severity level of 6 (informational), logs that have a severity level from 0 to 6 are output.

Table 14 Log levels

Severity

alue

Level Description

0 Emergency The system is unusable. For example, the system authorization has expired.

1 Alert

Action must be taken immediately. For example, traffic on an interface exceeds

the upper limit.