Log events overview

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

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

Log event format

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

  • time stamp in UTC or local time

  • generating application

  • hostname of the local system

  • subsystem identifying the affected object

  • short message describing the event

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

<TIMESTAMP> <HOSTNAME> <APPLICATION>: <SUBSYSTEM>|<PID>|<SEVERITY>: <MESSAGE>

The log event format is described in Log event format descriptions.

Table 1. Log event format descriptions

Label

Description

TIMESTAMP

UTC or local date stamp for the log event entry:

YYYY — Year

MM — Month

DD — Day

HH — Hours (24-hour format)

MM — Minutes

SS.SS — Seconds.hundredths of a second

<HOSTNAME>

System hostname

<APPLICATION>

Name of the application generating the log event message

<SUBSYSTEM>

Name of the subsystem generating the log event message

<PID>

Process ID

<SEVERITY>

A single character indicating how critical the message is (I stands for Informational, W stands for Warning, and so on)

<MESSAGE>

Text description of the log event

Example log event

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

Table 2. 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 3. 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 format 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
Raising event When the event is a facility alarm, the event that raises the alarm
Clearing event When the event is a facility alarm, the event that clears the alarm