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Mnemonic

As explained in Acing the CCNA Exam: Volume 2 Advanced Networking and Security

A mnemonic is a short text code in a Syslog message that identifies the reason or functional area associated with the event.

A mnemonic is a short text code in a Syslog message that identifies the specific reason or functional area associated with an event. It appears after the facility and severity, before the detailed description. section 7.2 section 7.3

Reading UPDOWN

In %LINK-3-UPDOWN: Interface FastEthernet0/1, changed state to down, LINK identifies the facility, 3 identifies severity, UPDOWN identifies an interface state change, and the description identifies the affected interface and new state. section 7.2

000065: Sep 19 01:01:01.133: %LINK-3-UPDOWN: Interface FastEthernet0/1,
changed state to down

Use the complete Syslog line to locate the facility, severity, mnemonic, and event description in sequence. section 7.2

How Acing the CCNA Exam: Volume 2 Advanced Networking and Security covers it

How deep it goes
Defines the mnemonic’s position and role, then stops short of cataloging mnemonic values.
Examples
Uses UPDOWN in a LINK message reporting FastEthernet0/1 changing state to down.
What it assumes
Assumes familiarity with Syslog messages and teaches the mnemonic’s role alongside other message components.
What you can do after
Evaluate Syslog messages by separating the mnemonic from the facility, severity, and detailed description.
How it connects
Connects mnemonics with Syslog facilities, severity levels, descriptions, and interface state changes.
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Related concepts

This explainer was generated by Manning's knowledge graph from the text of Acing the CCNA Exam: Volume 2 Advanced Networking and Security. The section links point to the parts of the book it draws on.