Log events overview

This section provides general information about the log events described in this guide for the Nokia Service Router Linux (SR Linux).

For more information about logging, see the SR Linux Configuration Basics Guide.

Example log event

The following contains an example log event entry from this guide for the bgpNeighborBackwardTransition log event.

Table 1. bgpNeighborBackwardTransition properties
Property name	Value
Application name	bgp
Event name	bgpNeighborBackwardTransition
Default severity	warning
Message format string	In network-instance $network-instance$, the BGP session with $peer-address$ moved from higher state $last-state$ to lower state $session-state$ due to event $last-event$
Cause	No routes can be exchanged with this peer
Effect	N/A

The table title for a log event entry is the event name. Each entry contains the information described in the table that follows.

Table 2. Log event entry field descriptions
Label	Description
Application name	Name of the application generating the log message
Event name	Name of the log event
Default severity	Severity level of the log event (see Log event entry field descriptions for the severity level)
Message format string	Text description of the log event
Cause	Cause of the log event
Effect	Effect of the log event

Log events that are forwarded to a destination are formatted. All application-generated events have the following properties:

A log event with a memory, console, or file destination has the following format:

nnnn YYYY/MM/DD HH:MM:SS.SS TZONE <severity>: <application> <router-name>
<subject> 
<message>

Format properties are described in Log event entry field descriptions.

Table 3. Log event entry field descriptions
Label	Description
nnnn	Log event entry sequence number
YYYY/MM/DD	UTC or local date stamp for the log event entry: `YYYY —` Year `MM —` Month `DD —` Day
HH:MM:SS.SS	UTC time stamp for the event: `HH —` Hours (24-hour format) `MM —` Minutes `SS.SS —` Seconds.hundredths of a second
TZONE	Time zone (for example, UTC, EDT)
<severity>	Severity level of the log event: emerg — System is unusable alert — Action must be taken immediately crit — Critical conditions err — Error conditions warning — Warning conditions notice — Normal but significant condition info — Informational messages debug — Debug-level messages
<application>	Name of the application generating the log event message
<router>	Router name representing the VRF-ID that generated the log event
<subject>	Subject/affected object for the log event
<message>	Text description of the log event