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CCNA 7.1.c: Syslog

Overview:

Syslog is a way for network devices to send event messages to a logging server, usually known as a Syslog server.

Study Notes:

• Syslog - System Message Logging
• Syslog uses port 514
• Controls the distribution of logging messages to various destinations based on the configuraiton
  • Logging buffer
  • Terminal lines
  • Syslog server
• When disabled, logging messages are sent only to the console
• Messages are sent as they are generated by the system
• Severity level of syslog messages can be sent to increase or reduce the amount and granularity of logging messages
  • 0 - emergencies
  • 1 - alerts
  • 2 - critical
  • 3 - errors
  • 4 - warnings
  • 5 - notifications
  • 6 - informational
  • 7 - debugging
• Able to timestamp messages for real-time debugging (check system clock)
• Syslog messages can be accessed via CLI and/or saved to a syslog server
• Syslog messages are displayed in this format

Seq_no:timestamp: %facility-severity-MNEMONIC:description

• For example

00:00:48: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/1, changed state to down 2

• Configuration

Router(config)#service timestamps log datetime [msec] [localtime] [show-timezone]
Router(config)#logging buffered <4096 to 2147483647>
Router(config)#logging <IP_address of syslog server>
Router(config)#logging console <level>
Router(config)#logging monitor <level>
Router(config)#logging trap <level>
Router(config)#end
Router#terminal monitor
Router#clock set hh:mm:ss <1-31> MON <1993-2035>

PacketTracer Lab: CCNA-7.1.c-Configure-and-verify-Syslog.pkt

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