The severity level is a single digit from 0 to 7, indicating the severity of the message. These are Cisco-specific values, not to be confused with the facility types used by the Syslog protocol itself (IOS uses syslog facility LOCAL7 by default). IOS 12.4 includes several hundred facilities, listed here. The facility indicates the device, protocol, or software module which generated the message. Cisco facility (and optional subfacility on certain platforms).The string beginning with the percent sign (%) consists of three parts: The human-friendly text of most messages is easy enough to interpret, but the beginning string of each takes a bit of explanation. Syslog archives are typically integrated with a network management service for correlation with other events. If remote logging is configured (with the logging host command), these messages are sent to a centralized syslog server for archival and analysis. These are syslog messages, generated by events on the router. %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/0, changed state to up %LINK-3-UPDOWN: Interface FastEthernet0/0, changed state to up Similarly, you've probably noticed this pair of messages whenever opening an interface: This message appears (if console logging is enabled) whenever global configuration mode is exited. %SYS-5-CONFIG_I: Configured from console by console Anyone with experience configuring Cisco routers is no doubt familiar with the following console message:
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