Syslog

Syslog is an industry standard protocol for message logging.

On network devices, Syslog can be used to log events such as changes in interfaces status (up <-> down), changes in OSPF neighbor status (up <-> down), system restart, etc.

The messages can be displayed in the CLI, saved in the devic's RAM, or sent to an external Syslog server.

Logs are essential when troubleshooting issues, examining the cause of incidents, etc.

Syslog and SNMP are both used for monitoring and troubleshooting of devices. They are complementary, but their functionalities are different.