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Show logging

December 11 2013 , Written by Cisco & Cisco Router, Network Switch Published on #Cisco Certification - CCNA - CCNP - CCIE

Use the show logging EXEC command to display the state of logging (syslog).

show logging [history]

Syntax Description: history (Optional) Display information in the syslog history table only.

Command Mode: EXEC

Usage Guidelines

This command first appeared in Cisco IOS Release 10.0.

This command displays the state of syslog error and event logging, including host addresses, and whether console logging is enabled. This command also displays Simple Network Management Protocol (SNMP) configuration parameters and protocol activity.

When you use the optional history keyword, information about the syslog history table is displayed such as the table size, the status of messages, and text of messages stored in the table. Messages stored in the table are governed by the logging history global configuration command.

Sample Display

The following is sample output from the show logging command:

Router# show logging

Syslog logging: enabled

     Console logging: disabled

     Monitor logging: level debugging, 266 messages logged.

     Trap logging: level informational, 266 messages logged.

     Logging to 192.180.2.238

SNMP logging: disabled, retransmission after 30 seconds

    0 messages logged

 

The following table describes significant fields shown in the display.

Field

Description

Syslog logging

When enabled, system logging messages are sent to a UNIX host that acts as a syslog server; that is, it captures and saves the messages.

Console logging

If enabled, states the level; otherwise, this field displays disabled.

Monitor logging

Minimum level of severity required for a log message to be sent to a monitor terminal (not the console).

Trap logging

Minimum level of severity required for a log message to be sent to a syslog server.

SNMP logging

Shows whether SNMP logging is enabled and the number of messages logged, and the retransmission interval.

The following is sample output from the show logging history command:

Router# show logging history

Syslog History Table: 1 maximum table entry, saving level notifications or higher

0 messages ignored, 0 dropped, 15 table entries flushed,

SNMP notifications not enabled

  entry number 16: SYS-5-CONFIG_I

  Configured from console by console

  timestamp: 1110

 

The following table describes the significant fields shown in the display.

Field

Description

maximum table entry

Number of messages that can be stored in the history table. Set with the logging history size command.

saving level notifications or higher

Level of messages that are stored in the history table and sent to the SNMP server (if SNMP notification is enabled). Set with the logging history command.

messages ignored

Number of messages not stored in the history table because the severity level is greater than that specified with the logging history command.

dropped

Number of messages that could not be processed due to lack of system resources. Dropped messages do not appear in the history table and are not sent to the SNMP server.

table entries flushed

Number of messages that have been removed from the history table to make room for newer messages.

SNMP notifications

Whether syslog traps of the appropriate level are sent to the SNMP server. Syslog traps are either enabled or not enabled through the snmp-server enable command.

entry number

Number of the message entry in the history table.

SYS-5-CONFIG_I
Configured from console by console

Cisco IOS syslog message consisting of the facility name (SYS) which indicates where the message came from, the severity level (5), the message name (CONFIG_I), and the message text.

timestamp

Time, based on the router's up time, that the message was generated.

More Related Cisco IOS Commands Reviews:

Show controllers command

Show interfaces

Show running-config

Cisco Show Version Command

Top 10 Commands Every Cisco IOS User Should Know

Configure logging in Cisco IOS

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