cisco 200-301 notes

cisco 200-301 notes.The logging level indicates a message of the specified level or higher. For example, if you set the level to 3, all messages with a level of 1.3 will be written to the log. The default facility is local70.The command logging facility is used to specify the appropriate file to write log messages to the syslog server; the default is local? The facilitytype allows you to provide different log files for different devices in the syslog server, so that finding log messages will be easier. The command logging source-interface specifies which interface of the router will be used to go to the syslog server; when sending log messages, the router defaults to the routing table to determine which interface to use, which in turn uses the IP address of that interface as the source IP address. You may need to configure this command if the router has multiple interfaces available to go to the logging server, and therefore multiple source IP addresses available, but the syslog server only accepts log messages from one IP address of the router. Finally, logging must be enabled using the command logging on - logging does not need to be enabled when sending log messages to the console, as it is available by default. Note that there are many other parameters to the command logging; the ones discussed earlier are the most commonly configured ones.By default, Cisco IOS devices do not include local timestamps (logging and time) in log messages sent to the syslog server: they rely on the server to add time to the log messages. To have the IOS device add local time, configure the following command. ios(config)# service timestamps(log | debug} datetime [msec] adds a timestamp to log messages and also adds a timestamp to the input of debug commands. The msec parameter specifies that the router includes milliseconds when adding a timestamp to a log message.Exam Point Be sure to familiarize yourself with the syntax of the command service timestamps.17.4.4 Verifying Logging FeaturesTo verify the logging configuration, use the command show logging - if the ability to write log messages to the router RAM (buffer) is enabled, you will see the following log message at the end of the output.IOS# show logging Syslog logging: enabled (0 messages dropped, 1 messages rate-limited, 0 flushes, 0 overruns, xml disabled, filtering disabled) Active Message Discriminator. Inactive Message Discriminator.No Console logging: level disabled,No Console logging: level disabled, No Monitor logging: level disabled,Buffer logging: level debugging, 32 messages logged, xml