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 event properties

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

  • time stamp in UTC or local time

  • generating application

  • router name identifying the VRF-ID that generated the event

  • subject identifying the affected object

  • short message describing the event

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